BIN
views/src/main/res/drawable/shadow_bottom.png
+ if (!mEnable) {
+ return false;
+ }
+ mDragHelper.processTouchEvent(event);
+ return true;
+ }
+
+ @Override
+ protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
+ mInLayout = true;
+ if (mContentView != null)
+ mContentView.layout(mContentLeft, mContentTop,
+ mContentLeft + mContentView.getMeasuredWidth(),
+ mContentTop + mContentView.getMeasuredHeight());
+ mInLayout = false;
+ }
+
+ @Override
+ public void requestLayout() {
+ if (!mInLayout) {
+ super.requestLayout();
+ }
+ }
+
+ @Override
+ protected boolean drawChild(Canvas canvas, View child, long drawingTime) {
+ final boolean drawContent = child == mContentView;
+
+ boolean ret = super.drawChild(canvas, child, drawingTime);
+ if (mScrimOpacity > 0 && drawContent
+ && mDragHelper.getViewDragState() != ViewDragHelper.STATE_IDLE) {
+ drawShadow(canvas, child);
+ drawScrim(canvas, child);
+ }
+ return ret;
+ }
+
+ private void drawScrim(Canvas canvas, View child) {
+ final int baseAlpha = (mScrimColor & 0xff000000) >>> 24;
+ final int alpha = (int) (baseAlpha * mScrimOpacity);
+ final int color = alpha << 24 | (mScrimColor & 0xffffff);
+
+ if ((mTrackingEdge & EDGE_LEFT) != 0) {
+ canvas.clipRect(0, 0, child.getLeft(), getHeight());
+ } else if ((mTrackingEdge & EDGE_RIGHT) != 0) {
+ canvas.clipRect(child.getRight(), 0, getRight(), getHeight());
+ } else if ((mTrackingEdge & EDGE_BOTTOM) != 0) {
+ canvas.clipRect(child.getLeft(), child.getBottom(), getRight(), getHeight());
+ }
+ canvas.drawColor(color);
+ }
+
+ private void drawShadow(Canvas canvas, View child) {
+ final Rect childRect = mTmpRect;
+ child.getHitRect(childRect);
+
+ if ((mEdgeFlag & EDGE_LEFT) != 0) {
+ mShadowLeft.setBounds(childRect.left - mShadowLeft.getIntrinsicWidth(), childRect.top,
+ childRect.left, childRect.bottom);
+ mShadowLeft.setAlpha((int) (mScrimOpacity * FULL_ALPHA));
+ mShadowLeft.draw(canvas);
+ }
+
+ if ((mEdgeFlag & EDGE_RIGHT) != 0) {
+ mShadowRight.setBounds(childRect.right, childRect.top,
+ childRect.right + mShadowRight.getIntrinsicWidth(), childRect.bottom);
+ mShadowRight.setAlpha((int) (mScrimOpacity * FULL_ALPHA));
+ mShadowRight.draw(canvas);
+ }
+
+ if ((mEdgeFlag & EDGE_BOTTOM) != 0) {
+ mShadowBottom.setBounds(childRect.left, childRect.bottom, childRect.right,
+ childRect.bottom + mShadowBottom.getIntrinsicHeight());
+ mShadowBottom.setAlpha((int) (mScrimOpacity * FULL_ALPHA));
+ mShadowBottom.draw(canvas);
+ }
+ }
+
+ public void attachToActivity(Activity activity) {
+ mActivity = activity;
+ TypedArray a = activity.getTheme().obtainStyledAttributes(new int[]{
+ android.R.attr.windowBackground
+ });
+ int background = a.getResourceId(0, 0);
+ a.recycle();
+
+ ViewGroup decor = (ViewGroup) activity.getWindow().getDecorView();
+ ViewGroup decorChild = (ViewGroup) decor.getChildAt(0);
+ decorChild.setBackgroundResource(background);
+ decor.removeView(decorChild);
+ addView(decorChild);
+ setContentView(decorChild);
+ decor.addView(this);
+ }
+
+ @Override
+ public void computeScroll() {
+ mScrimOpacity = 1 - mScrollPercent;
+ if (mDragHelper.continueSettling(true)) {
+ ViewCompat.postInvalidateOnAnimation(this);
+ }
+ }
+
+ private class ViewDragCallback extends ViewDragHelper.Callback {
+ private boolean mIsScrollOverValid;
+
+ @Override
+ public boolean tryCaptureView(View view, int i) {
+ boolean ret = mDragHelper.isEdgeTouched(mEdgeFlag, i);
+ if (ret) {
+ if (mDragHelper.isEdgeTouched(EDGE_LEFT, i)) {
+ mTrackingEdge = EDGE_LEFT;
+ } else if (mDragHelper.isEdgeTouched(EDGE_RIGHT, i)) {
+ mTrackingEdge = EDGE_RIGHT;
+ } else if (mDragHelper.isEdgeTouched(EDGE_BOTTOM, i)) {
+ mTrackingEdge = EDGE_BOTTOM;
+ }
+ if (mListeners != null && !mListeners.isEmpty()) {
+ for (SwipeListener listener : mListeners) {
+ listener.onEdgeTouch(mTrackingEdge);
+ }
+ }
+ mIsScrollOverValid = true;
+ }
+ boolean directionCheck = false;
+ if (mEdgeFlag == EDGE_LEFT || mEdgeFlag == EDGE_RIGHT) {
+ directionCheck = !mDragHelper.checkTouchSlop(ViewDragHelper.DIRECTION_VERTICAL, i);
+ } else if (mEdgeFlag == EDGE_BOTTOM) {
+ directionCheck = !mDragHelper
+ .checkTouchSlop(ViewDragHelper.DIRECTION_HORIZONTAL, i);
+ } else if (mEdgeFlag == EDGE_ALL) {
+ directionCheck = true;
+ }
+ return ret & directionCheck;
+ }
+
+ @Override
+ public int getViewHorizontalDragRange(View child) {
+ return mEdgeFlag & (EDGE_LEFT | EDGE_RIGHT);
+ }
+
+ @Override
+ public int getViewVerticalDragRange(View child) {
+ return mEdgeFlag & EDGE_BOTTOM;
+ }
+
+ @Override
+ public void onViewPositionChanged(View changedView, int left, int top, int dx, int dy) {
+ super.onViewPositionChanged(changedView, left, top, dx, dy);
+ if ((mTrackingEdge & EDGE_LEFT) != 0) {
+ mScrollPercent = Math.abs((float) left
+ / (mContentView.getWidth() + mShadowLeft.getIntrinsicWidth()));
+ } else if ((mTrackingEdge & EDGE_RIGHT) != 0) {
+ mScrollPercent = Math.abs((float) left
+ / (mContentView.getWidth() + mShadowRight.getIntrinsicWidth()));
+ } else if ((mTrackingEdge & EDGE_BOTTOM) != 0) {
+ mScrollPercent = Math.abs((float) top
+ / (mContentView.getHeight() + mShadowBottom.getIntrinsicHeight()));
+ }
+ mContentLeft = left;
+ mContentTop = top;
+ invalidate();
+ if (mScrollPercent < mScrollThreshold && !mIsScrollOverValid) {
+ mIsScrollOverValid = true;
+ }
+ if (mListeners != null && !mListeners.isEmpty()
+ && mDragHelper.getViewDragState() == STATE_DRAGGING
+ && mScrollPercent >= mScrollThreshold && mIsScrollOverValid) {
+ mIsScrollOverValid = false;
+ for (SwipeListener listener : mListeners) {
+ listener.onScrollOverThreshold();
+ }
+ }
+
+ if (mScrollPercent >= 1) {
+ if (!mActivity.isFinishing()) {
+ mActivity.finish();
+ mActivity.overridePendingTransition(0, 0);
+ }
+ }
+ }
+
+ @Override
+ public void onViewReleased(View releasedChild, float xvel, float yvel) {
+ final int childWidth = releasedChild.getWidth();
+ final int childHeight = releasedChild.getHeight();
+
+ int left = 0, top = 0;
+ if ((mTrackingEdge & EDGE_LEFT) != 0) {
+ left = xvel > 0 || xvel == 0 && mScrollPercent > mScrollThreshold ? childWidth
+ + mShadowLeft.getIntrinsicWidth() + OVERSCROLL_DISTANCE : 0;
+ } else if ((mTrackingEdge & EDGE_RIGHT) != 0) {
+ left = xvel < 0 || xvel == 0 && mScrollPercent > mScrollThreshold ? -(childWidth
+ + mShadowLeft.getIntrinsicWidth() + OVERSCROLL_DISTANCE) : 0;
+ } else if ((mTrackingEdge & EDGE_BOTTOM) != 0) {
+ top = yvel < 0 || yvel == 0 && mScrollPercent > mScrollThreshold ? -(childHeight
+ + mShadowBottom.getIntrinsicHeight() + OVERSCROLL_DISTANCE) : 0;
+ }
+
+ mDragHelper.settleCapturedViewAt(left, top);
+ invalidate();
+ }
+
+ @Override
+ public int clampViewPositionHorizontal(View child, int left, int dx) {
+ int ret = 0;
+ if ((mTrackingEdge & EDGE_LEFT) != 0) {
+ ret = Math.min(child.getWidth(), Math.max(left, 0));
+ } else if ((mTrackingEdge & EDGE_RIGHT) != 0) {
+ ret = Math.min(0, Math.max(left, -child.getWidth()));
+ }
+ return ret;
+ }
+
+ @Override
+ public int clampViewPositionVertical(View child, int top, int dy) {
+ int ret = 0;
+ if ((mTrackingEdge & EDGE_BOTTOM) != 0) {
+ ret = Math.min(0, Math.max(top, -child.getHeight()));
+ }
+ return ret;
+ }
+
+ @Override
+ public void onViewDragStateChanged(int state) {
+ super.onViewDragStateChanged(state);
+ if (mListeners != null && !mListeners.isEmpty()) {
+ for (SwipeListener listener : mListeners) {
+ listener.onScrollStateChange(state, mScrollPercent);
+ }
+ }
+ }
+ }
+}
@@ -0,0 +1,103 @@ |
||
| 1 |
+ |
|
| 2 |
+package com.android.views.swipebacklayout; |
|
| 3 |
+ |
|
| 4 |
+import android.app.Activity; |
|
| 5 |
+import android.app.ActivityOptions; |
|
| 6 |
+import android.os.Build; |
|
| 7 |
+ |
|
| 8 |
+import java.lang.reflect.Method; |
|
| 9 |
+ |
|
| 10 |
+/** |
|
| 11 |
+ * Created by Chaojun Wang on 6/9/14. |
|
| 12 |
+ */ |
|
| 13 |
+public class Utils {
|
|
| 14 |
+ private Utils() {
|
|
| 15 |
+ } |
|
| 16 |
+ |
|
| 17 |
+ /** |
|
| 18 |
+ * Convert a translucent themed Activity |
|
| 19 |
+ * {@link android.R.attr#windowIsTranslucent} to a fullscreen opaque
|
|
| 20 |
+ * Activity. |
|
| 21 |
+ * <p> |
|
| 22 |
+ * Call this whenever the background of a translucent Activity has changed |
|
| 23 |
+ * to become opaque. Doing so will allow the {@link android.view.Surface} of
|
|
| 24 |
+ * the Activity behind to be released. |
|
| 25 |
+ * <p> |
|
| 26 |
+ * This call has no effect on non-translucent activities or on activities |
|
| 27 |
+ * with the {@link android.R.attr#windowIsFloating} attribute.
|
|
| 28 |
+ */ |
|
| 29 |
+ public static void convertActivityFromTranslucent(Activity activity) {
|
|
| 30 |
+ try {
|
|
| 31 |
+ Method method = Activity.class.getDeclaredMethod("convertFromTranslucent");
|
|
| 32 |
+ method.setAccessible(true); |
|
| 33 |
+ method.invoke(activity); |
|
| 34 |
+ } catch (Throwable t) {
|
|
| 35 |
+ } |
|
| 36 |
+ } |
|
| 37 |
+ |
|
| 38 |
+ /** |
|
| 39 |
+ * Convert a translucent themed Activity |
|
| 40 |
+ * {@link android.R.attr#windowIsTranslucent} back from opaque to
|
|
| 41 |
+ * translucent following a call to |
|
| 42 |
+ * {@link #convertActivityFromTranslucent(Activity)} .
|
|
| 43 |
+ * <p> |
|
| 44 |
+ * Calling this allows the Activity behind this one to be seen again. Once |
|
| 45 |
+ * all such Activities have been redrawn |
|
| 46 |
+ * <p> |
|
| 47 |
+ * This call has no effect on non-translucent activities or on activities |
|
| 48 |
+ * with the {@link android.R.attr#windowIsFloating} attribute.
|
|
| 49 |
+ */ |
|
| 50 |
+ public static void convertActivityToTranslucent(Activity activity) {
|
|
| 51 |
+ if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
|
|
| 52 |
+ convertActivityToTranslucentAfterL(activity); |
|
| 53 |
+ } else {
|
|
| 54 |
+ convertActivityToTranslucentBeforeL(activity); |
|
| 55 |
+ } |
|
| 56 |
+ } |
|
| 57 |
+ |
|
| 58 |
+ /** |
|
| 59 |
+ * Calling the convertToTranslucent method on platforms before Android 5.0 |
|
| 60 |
+ */ |
|
| 61 |
+ public static void convertActivityToTranslucentBeforeL(Activity activity) {
|
|
| 62 |
+ try {
|
|
| 63 |
+ Class<?>[] classes = Activity.class.getDeclaredClasses(); |
|
| 64 |
+ Class<?> translucentConversionListenerClazz = null; |
|
| 65 |
+ for (Class clazz : classes) {
|
|
| 66 |
+ if (clazz.getSimpleName().contains("TranslucentConversionListener")) {
|
|
| 67 |
+ translucentConversionListenerClazz = clazz; |
|
| 68 |
+ } |
|
| 69 |
+ } |
|
| 70 |
+ Method method = Activity.class.getDeclaredMethod("convertToTranslucent",
|
|
| 71 |
+ translucentConversionListenerClazz); |
|
| 72 |
+ method.setAccessible(true); |
|
| 73 |
+ method.invoke(activity, new Object[] {
|
|
| 74 |
+ null |
|
| 75 |
+ }); |
|
| 76 |
+ } catch (Throwable t) {
|
|
| 77 |
+ } |
|
| 78 |
+ } |
|
| 79 |
+ |
|
| 80 |
+ /** |
|
| 81 |
+ * Calling the convertToTranslucent method on platforms after Android 5.0 |
|
| 82 |
+ */ |
|
| 83 |
+ private static void convertActivityToTranslucentAfterL(Activity activity) {
|
|
| 84 |
+ try {
|
|
| 85 |
+ Method getActivityOptions = Activity.class.getDeclaredMethod("getActivityOptions");
|
|
| 86 |
+ getActivityOptions.setAccessible(true); |
|
| 87 |
+ Object options = getActivityOptions.invoke(activity); |
|
| 88 |
+ |
|
| 89 |
+ Class<?>[] classes = Activity.class.getDeclaredClasses(); |
|
| 90 |
+ Class<?> translucentConversionListenerClazz = null; |
|
| 91 |
+ for (Class clazz : classes) {
|
|
| 92 |
+ if (clazz.getSimpleName().contains("TranslucentConversionListener")) {
|
|
| 93 |
+ translucentConversionListenerClazz = clazz; |
|
| 94 |
+ } |
|
| 95 |
+ } |
|
| 96 |
+ Method convertToTranslucent = Activity.class.getDeclaredMethod("convertToTranslucent",
|
|
| 97 |
+ translucentConversionListenerClazz, ActivityOptions.class); |
|
| 98 |
+ convertToTranslucent.setAccessible(true); |
|
| 99 |
+ convertToTranslucent.invoke(activity, null, options); |
|
| 100 |
+ } catch (Throwable t) {
|
|
| 101 |
+ } |
|
| 102 |
+ } |
|
| 103 |
+} |
@@ -0,0 +1,1580 @@ |
||
| 1 |
+/* |
|
| 2 |
+ * Copyright (C) 2013 The Android Open Source Project |
|
| 3 |
+ * |
|
| 4 |
+ * Licensed under the Apache License, Version 2.0 (the "License"); |
|
| 5 |
+ * you may not use this file except in compliance with the License. |
|
| 6 |
+ * You may obtain a copy of the License at |
|
| 7 |
+ * |
|
| 8 |
+ * http://www.apache.org/licenses/LICENSE-2.0 |
|
| 9 |
+ * |
|
| 10 |
+ * Unless required by applicable law or agreed to in writing, software |
|
| 11 |
+ * distributed under the License is distributed on an "AS IS" BASIS, |
|
| 12 |
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
|
| 13 |
+ * See the License for the specific language governing permissions and |
|
| 14 |
+ * limitations under the License. |
|
| 15 |
+ */ |
|
| 16 |
+ |
|
| 17 |
+package com.android.views.swipebacklayout; |
|
| 18 |
+ |
|
| 19 |
+import android.content.Context; |
|
| 20 |
+import android.support.v4.view.MotionEventCompat; |
|
| 21 |
+import android.support.v4.view.VelocityTrackerCompat; |
|
| 22 |
+import android.support.v4.view.ViewCompat; |
|
| 23 |
+import android.support.v4.widget.ScrollerCompat; |
|
| 24 |
+import android.view.MotionEvent; |
|
| 25 |
+import android.view.VelocityTracker; |
|
| 26 |
+import android.view.View; |
|
| 27 |
+import android.view.ViewConfiguration; |
|
| 28 |
+import android.view.ViewGroup; |
|
| 29 |
+import android.view.animation.Interpolator; |
|
| 30 |
+ |
|
| 31 |
+import java.util.Arrays; |
|
| 32 |
+ |
|
| 33 |
+/** |
|
| 34 |
+ * ViewDragHelper is a utility class for writing custom ViewGroups. It offers a |
|
| 35 |
+ * number of useful operations and state tracking for allowing a user to drag |
|
| 36 |
+ * and reposition views within their parent ViewGroup. |
|
| 37 |
+ */ |
|
| 38 |
+public class ViewDragHelper {
|
|
| 39 |
+ private static final String TAG = "ViewDragHelper"; |
|
| 40 |
+ |
|
| 41 |
+ /** |
|
| 42 |
+ * A null/invalid pointer ID. |
|
| 43 |
+ */ |
|
| 44 |
+ public static final int INVALID_POINTER = -1; |
|
| 45 |
+ |
|
| 46 |
+ /** |
|
| 47 |
+ * A view is not currently being dragged or animating as a result of a |
|
| 48 |
+ * fling/snap. |
|
| 49 |
+ */ |
|
| 50 |
+ public static final int STATE_IDLE = 0; |
|
| 51 |
+ |
|
| 52 |
+ /** |
|
| 53 |
+ * A view is currently being dragged. The position is currently changing as |
|
| 54 |
+ * a result of user input or simulated user input. |
|
| 55 |
+ */ |
|
| 56 |
+ public static final int STATE_DRAGGING = 1; |
|
| 57 |
+ |
|
| 58 |
+ /** |
|
| 59 |
+ * A view is currently settling into place as a result of a fling or |
|
| 60 |
+ * predefined non-interactive motion. |
|
| 61 |
+ */ |
|
| 62 |
+ public static final int STATE_SETTLING = 2; |
|
| 63 |
+ |
|
| 64 |
+ /** |
|
| 65 |
+ * Edge flag indicating that the left edge should be affected. |
|
| 66 |
+ */ |
|
| 67 |
+ public static final int EDGE_LEFT = 1 << 0; |
|
| 68 |
+ |
|
| 69 |
+ /** |
|
| 70 |
+ * Edge flag indicating that the right edge should be affected. |
|
| 71 |
+ */ |
|
| 72 |
+ public static final int EDGE_RIGHT = 1 << 1; |
|
| 73 |
+ |
|
| 74 |
+ /** |
|
| 75 |
+ * Edge flag indicating that the top edge should be affected. |
|
| 76 |
+ */ |
|
| 77 |
+ public static final int EDGE_TOP = 1 << 2; |
|
| 78 |
+ |
|
| 79 |
+ /** |
|
| 80 |
+ * Edge flag indicating that the bottom edge should be affected. |
|
| 81 |
+ */ |
|
| 82 |
+ public static final int EDGE_BOTTOM = 1 << 3; |
|
| 83 |
+ |
|
| 84 |
+ /** |
|
| 85 |
+ * Edge flag set indicating all edges should be affected. |
|
| 86 |
+ */ |
|
| 87 |
+ public static final int EDGE_ALL = EDGE_LEFT | EDGE_TOP | EDGE_RIGHT | EDGE_BOTTOM; |
|
| 88 |
+ |
|
| 89 |
+ /** |
|
| 90 |
+ * Indicates that a check should occur along the horizontal axis |
|
| 91 |
+ */ |
|
| 92 |
+ public static final int DIRECTION_HORIZONTAL = 1 << 0; |
|
| 93 |
+ |
|
| 94 |
+ /** |
|
| 95 |
+ * Indicates that a check should occur along the vertical axis |
|
| 96 |
+ */ |
|
| 97 |
+ public static final int DIRECTION_VERTICAL = 1 << 1; |
|
| 98 |
+ |
|
| 99 |
+ /** |
|
| 100 |
+ * Indicates that a check should occur along all axes |
|
| 101 |
+ */ |
|
| 102 |
+ public static final int DIRECTION_ALL = DIRECTION_HORIZONTAL | DIRECTION_VERTICAL; |
|
| 103 |
+ |
|
| 104 |
+ public static final int EDGE_SIZE = 20; // dp |
|
| 105 |
+ |
|
| 106 |
+ private static final int BASE_SETTLE_DURATION = 256; // ms |
|
| 107 |
+ |
|
| 108 |
+ private static final int MAX_SETTLE_DURATION = 600; // ms |
|
| 109 |
+ |
|
| 110 |
+ // Current drag state; idle, dragging or settling |
|
| 111 |
+ private int mDragState; |
|
| 112 |
+ |
|
| 113 |
+ // Distance to travel before a drag may begin |
|
| 114 |
+ private int mTouchSlop; |
|
| 115 |
+ |
|
| 116 |
+ // Last known position/pointer tracking |
|
| 117 |
+ private int mActivePointerId = INVALID_POINTER; |
|
| 118 |
+ |
|
| 119 |
+ private float[] mInitialMotionX; |
|
| 120 |
+ |
|
| 121 |
+ private float[] mInitialMotionY; |
|
| 122 |
+ |
|
| 123 |
+ private float[] mLastMotionX; |
|
| 124 |
+ |
|
| 125 |
+ private float[] mLastMotionY; |
|
| 126 |
+ |
|
| 127 |
+ private int[] mInitialEdgeTouched; |
|
| 128 |
+ |
|
| 129 |
+ private int[] mEdgeDragsInProgress; |
|
| 130 |
+ |
|
| 131 |
+ private int[] mEdgeDragsLocked; |
|
| 132 |
+ |
|
| 133 |
+ private int mPointersDown; |
|
| 134 |
+ |
|
| 135 |
+ private VelocityTracker mVelocityTracker; |
|
| 136 |
+ |
|
| 137 |
+ private float mMaxVelocity; |
|
| 138 |
+ |
|
| 139 |
+ private float mMinVelocity; |
|
| 140 |
+ |
|
| 141 |
+ private int mEdgeSize; |
|
| 142 |
+ |
|
| 143 |
+ private int mTrackingEdges; |
|
| 144 |
+ |
|
| 145 |
+ private ScrollerCompat mScroller; |
|
| 146 |
+ |
|
| 147 |
+ private final Callback mCallback; |
|
| 148 |
+ |
|
| 149 |
+ private View mCapturedView; |
|
| 150 |
+ |
|
| 151 |
+ private boolean mReleaseInProgress; |
|
| 152 |
+ |
|
| 153 |
+ private final ViewGroup mParentView; |
|
| 154 |
+ |
|
| 155 |
+ /** |
|
| 156 |
+ * A Callback is used as a communication channel with the ViewDragHelper |
|
| 157 |
+ * back to the parent view using it. <code>on*</code>methods are invoked on |
|
| 158 |
+ * siginficant events and several accessor methods are expected to provide |
|
| 159 |
+ * the ViewDragHelper with more information about the state of the parent |
|
| 160 |
+ * view upon request. The callback also makes decisions governing the range |
|
| 161 |
+ * and draggability of child views. |
|
| 162 |
+ */ |
|
| 163 |
+ public static abstract class Callback {
|
|
| 164 |
+ /** |
|
| 165 |
+ * Called when the drag state changes. See the <code>STATE_*</code> |
|
| 166 |
+ * constants for more information. |
|
| 167 |
+ * |
|
| 168 |
+ * @param state The new drag state |
|
| 169 |
+ * @see #STATE_IDLE |
|
| 170 |
+ * @see #STATE_DRAGGING |
|
| 171 |
+ * @see #STATE_SETTLING |
|
| 172 |
+ */ |
|
| 173 |
+ public void onViewDragStateChanged(int state) {
|
|
| 174 |
+ } |
|
| 175 |
+ |
|
| 176 |
+ /** |
|
| 177 |
+ * Called when the captured view's position changes as the result of a |
|
| 178 |
+ * drag or settle. |
|
| 179 |
+ * |
|
| 180 |
+ * @param changedView View whose position changed |
|
| 181 |
+ * @param left New X coordinate of the left edge of the view |
|
| 182 |
+ * @param top New Y coordinate of the top edge of the view |
|
| 183 |
+ * @param dx Change in X position from the last call |
|
| 184 |
+ * @param dy Change in Y position from the last call |
|
| 185 |
+ */ |
|
| 186 |
+ public void onViewPositionChanged(View changedView, int left, int top, int dx, int dy) {
|
|
| 187 |
+ } |
|
| 188 |
+ |
|
| 189 |
+ /** |
|
| 190 |
+ * Called when a child view is captured for dragging or settling. The ID |
|
| 191 |
+ * of the pointer currently dragging the captured view is supplied. If |
|
| 192 |
+ * activePointerId is identified as {@link #INVALID_POINTER} the capture
|
|
| 193 |
+ * is programmatic instead of pointer-initiated. |
|
| 194 |
+ * |
|
| 195 |
+ * @param capturedChild Child view that was captured |
|
| 196 |
+ * @param activePointerId Pointer id tracking the child capture |
|
| 197 |
+ */ |
|
| 198 |
+ public void onViewCaptured(View capturedChild, int activePointerId) {
|
|
| 199 |
+ } |
|
| 200 |
+ |
|
| 201 |
+ /** |
|
| 202 |
+ * Called when the child view is no longer being actively dragged. The |
|
| 203 |
+ * fling velocity is also supplied, if relevant. The velocity values may |
|
| 204 |
+ * be clamped to system minimums or maximums. |
|
| 205 |
+ * <p> |
|
| 206 |
+ * Calling code may decide to fling or otherwise release the view to let |
|
| 207 |
+ * it settle into place. It should do so using |
|
| 208 |
+ * {@link #settleCapturedViewAt(int, int)} or
|
|
| 209 |
+ * {@link #flingCapturedView(int, int, int, int)}. If the Callback
|
|
| 210 |
+ * invokes one of these methods, the ViewDragHelper will enter |
|
| 211 |
+ * {@link #STATE_SETTLING} and the view capture will not fully end until
|
|
| 212 |
+ * it comes to a complete stop. If neither of these methods is invoked |
|
| 213 |
+ * before <code>onViewReleased</code> returns, the view will stop in |
|
| 214 |
+ * place and the ViewDragHelper will return to {@link #STATE_IDLE}.
|
|
| 215 |
+ * </p> |
|
| 216 |
+ * |
|
| 217 |
+ * @param releasedChild The captured child view now being released |
|
| 218 |
+ * @param xvel X velocity of the pointer as it left the screen in pixels |
|
| 219 |
+ * per second. |
|
| 220 |
+ * @param yvel Y velocity of the pointer as it left the screen in pixels |
|
| 221 |
+ * per second. |
|
| 222 |
+ */ |
|
| 223 |
+ public void onViewReleased(View releasedChild, float xvel, float yvel) {
|
|
| 224 |
+ } |
|
| 225 |
+ |
|
| 226 |
+ /** |
|
| 227 |
+ * Called when one of the subscribed edges in the parent view has been |
|
| 228 |
+ * touched by the user while no child view is currently captured. |
|
| 229 |
+ * |
|
| 230 |
+ * @param edgeFlags A combination of edge flags describing the edge(s) |
|
| 231 |
+ * currently touched |
|
| 232 |
+ * @param pointerId ID of the pointer touching the described edge(s) |
|
| 233 |
+ * @see #EDGE_LEFT |
|
| 234 |
+ * @see #EDGE_TOP |
|
| 235 |
+ * @see #EDGE_RIGHT |
|
| 236 |
+ * @see #EDGE_BOTTOM |
|
| 237 |
+ */ |
|
| 238 |
+ public void onEdgeTouched(int edgeFlags, int pointerId) {
|
|
| 239 |
+ } |
|
| 240 |
+ |
|
| 241 |
+ /** |
|
| 242 |
+ * Called when the given edge may become locked. This can happen if an |
|
| 243 |
+ * edge drag was preliminarily rejected before beginning, but after |
|
| 244 |
+ * {@link #onEdgeTouched(int, int)} was called. This method should
|
|
| 245 |
+ * return true to lock this edge or false to leave it unlocked. The |
|
| 246 |
+ * default behavior is to leave edges unlocked. |
|
| 247 |
+ * |
|
| 248 |
+ * @param edgeFlags A combination of edge flags describing the edge(s) |
|
| 249 |
+ * locked |
|
| 250 |
+ * @return true to lock the edge, false to leave it unlocked |
|
| 251 |
+ */ |
|
| 252 |
+ public boolean onEdgeLock(int edgeFlags) {
|
|
| 253 |
+ return false; |
|
| 254 |
+ } |
|
| 255 |
+ |
|
| 256 |
+ /** |
|
| 257 |
+ * Called when the user has started a deliberate drag away from one of |
|
| 258 |
+ * the subscribed edges in the parent view while no child view is |
|
| 259 |
+ * currently captured. |
|
| 260 |
+ * |
|
| 261 |
+ * @param edgeFlags A combination of edge flags describing the edge(s) |
|
| 262 |
+ * dragged |
|
| 263 |
+ * @param pointerId ID of the pointer touching the described edge(s) |
|
| 264 |
+ * @see #EDGE_LEFT |
|
| 265 |
+ * @see #EDGE_TOP |
|
| 266 |
+ * @see #EDGE_RIGHT |
|
| 267 |
+ * @see #EDGE_BOTTOM |
|
| 268 |
+ */ |
|
| 269 |
+ public void onEdgeDragStarted(int edgeFlags, int pointerId) {
|
|
| 270 |
+ } |
|
| 271 |
+ |
|
| 272 |
+ /** |
|
| 273 |
+ * Called to determine the Z-order of child views. |
|
| 274 |
+ * |
|
| 275 |
+ * @param index the ordered position to query for |
|
| 276 |
+ * @return index of the view that should be ordered at position |
|
| 277 |
+ * <code>index</code> |
|
| 278 |
+ */ |
|
| 279 |
+ public int getOrderedChildIndex(int index) {
|
|
| 280 |
+ return index; |
|
| 281 |
+ } |
|
| 282 |
+ |
|
| 283 |
+ /** |
|
| 284 |
+ * Return the magnitude of a draggable child view's horizontal range of |
|
| 285 |
+ * motion in pixels. This method should return 0 for views that cannot |
|
| 286 |
+ * move horizontally. |
|
| 287 |
+ * |
|
| 288 |
+ * @param child Child view to check |
|
| 289 |
+ * @return range of horizontal motion in pixels |
|
| 290 |
+ */ |
|
| 291 |
+ public int getViewHorizontalDragRange(View child) {
|
|
| 292 |
+ return 0; |
|
| 293 |
+ } |
|
| 294 |
+ |
|
| 295 |
+ /** |
|
| 296 |
+ * Return the magnitude of a draggable child view's vertical range of |
|
| 297 |
+ * motion in pixels. This method should return 0 for views that cannot |
|
| 298 |
+ * move vertically. |
|
| 299 |
+ * |
|
| 300 |
+ * @param child Child view to check |
|
| 301 |
+ * @return range of vertical motion in pixels |
|
| 302 |
+ */ |
|
| 303 |
+ public int getViewVerticalDragRange(View child) {
|
|
| 304 |
+ return 0; |
|
| 305 |
+ } |
|
| 306 |
+ |
|
| 307 |
+ /** |
|
| 308 |
+ * Called when the user's input indicates that they want to capture the |
|
| 309 |
+ * given child view with the pointer indicated by pointerId. The |
|
| 310 |
+ * callback should return true if the user is permitted to drag the |
|
| 311 |
+ * given view with the indicated pointer. |
|
| 312 |
+ * <p> |
|
| 313 |
+ * ViewDragHelper may call this method multiple times for the same view |
|
| 314 |
+ * even if the view is already captured; this indicates that a new |
|
| 315 |
+ * pointer is trying to take control of the view. |
|
| 316 |
+ * </p> |
|
| 317 |
+ * <p> |
|
| 318 |
+ * If this method returns true, a call to |
|
| 319 |
+ * {@link #onViewCaptured(View, int)} will follow if the
|
|
| 320 |
+ * capture is successful. |
|
| 321 |
+ * </p> |
|
| 322 |
+ * |
|
| 323 |
+ * @param child Child the user is attempting to capture |
|
| 324 |
+ * @param pointerId ID of the pointer attempting the capture |
|
| 325 |
+ * @return true if capture should be allowed, false otherwise |
|
| 326 |
+ */ |
|
| 327 |
+ public abstract boolean tryCaptureView(View child, int pointerId); |
|
| 328 |
+ |
|
| 329 |
+ /** |
|
| 330 |
+ * Restrict the motion of the dragged child view along the horizontal |
|
| 331 |
+ * axis. The default implementation does not allow horizontal motion; |
|
| 332 |
+ * the extending class must override this method and provide the desired |
|
| 333 |
+ * clamping. |
|
| 334 |
+ * |
|
| 335 |
+ * @param child Child view being dragged |
|
| 336 |
+ * @param left Attempted motion along the X axis |
|
| 337 |
+ * @param dx Proposed change in position for left |
|
| 338 |
+ * @return The new clamped position for left |
|
| 339 |
+ */ |
|
| 340 |
+ public int clampViewPositionHorizontal(View child, int left, int dx) {
|
|
| 341 |
+ return 0; |
|
| 342 |
+ } |
|
| 343 |
+ |
|
| 344 |
+ /** |
|
| 345 |
+ * Restrict the motion of the dragged child view along the vertical |
|
| 346 |
+ * axis. The default implementation does not allow vertical motion; the |
|
| 347 |
+ * extending class must override this method and provide the desired |
|
| 348 |
+ * clamping. |
|
| 349 |
+ * |
|
| 350 |
+ * @param child Child view being dragged |
|
| 351 |
+ * @param top Attempted motion along the Y axis |
|
| 352 |
+ * @param dy Proposed change in position for top |
|
| 353 |
+ * @return The new clamped position for top |
|
| 354 |
+ */ |
|
| 355 |
+ public int clampViewPositionVertical(View child, int top, int dy) {
|
|
| 356 |
+ return 0; |
|
| 357 |
+ } |
|
| 358 |
+ } |
|
| 359 |
+ |
|
| 360 |
+ /** |
|
| 361 |
+ * Interpolator defining the animation curve for mScroller |
|
| 362 |
+ */ |
|
| 363 |
+ private static final Interpolator sInterpolator = new Interpolator() {
|
|
| 364 |
+ public float getInterpolation(float t) {
|
|
| 365 |
+ t -= 1.0f; |
|
| 366 |
+ return t * t * t * t * t + 1.0f; |
|
| 367 |
+ } |
|
| 368 |
+ }; |
|
| 369 |
+ |
|
| 370 |
+ private final Runnable mSetIdleRunnable = new Runnable() {
|
|
| 371 |
+ public void run() {
|
|
| 372 |
+ setDragState(STATE_IDLE); |
|
| 373 |
+ } |
|
| 374 |
+ }; |
|
| 375 |
+ |
|
| 376 |
+ /** |
|
| 377 |
+ * Factory method to create a new ViewDragHelper. |
|
| 378 |
+ * |
|
| 379 |
+ * @param forParent Parent view to monitor |
|
| 380 |
+ * @param cb Callback to provide information and receive events |
|
| 381 |
+ * @return a new ViewDragHelper instance |
|
| 382 |
+ */ |
|
| 383 |
+ public static ViewDragHelper create(ViewGroup forParent, Callback cb) {
|
|
| 384 |
+ return new ViewDragHelper(forParent.getContext(), forParent, cb); |
|
| 385 |
+ } |
|
| 386 |
+ |
|
| 387 |
+ /** |
|
| 388 |
+ * Factory method to create a new ViewDragHelper. |
|
| 389 |
+ * |
|
| 390 |
+ * @param forParent Parent view to monitor |
|
| 391 |
+ * @param sensitivity Multiplier for how sensitive the helper should be |
|
| 392 |
+ * about detecting the start of a drag. Larger values are more |
|
| 393 |
+ * sensitive. 1.0f is normal. |
|
| 394 |
+ * @param cb Callback to provide information and receive events |
|
| 395 |
+ * @return a new ViewDragHelper instance |
|
| 396 |
+ */ |
|
| 397 |
+ public static ViewDragHelper create(ViewGroup forParent, float sensitivity, Callback cb) {
|
|
| 398 |
+ final ViewDragHelper helper = create(forParent, cb); |
|
| 399 |
+ helper.mTouchSlop = (int) (helper.mTouchSlop * (1 / sensitivity)); |
|
| 400 |
+ return helper; |
|
| 401 |
+ } |
|
| 402 |
+ |
|
| 403 |
+ /** |
|
| 404 |
+ * Apps should use ViewDragHelper.create() to get a new instance. This will |
|
| 405 |
+ * allow VDH to use internal compatibility implementations for different |
|
| 406 |
+ * platform versions. |
|
| 407 |
+ * |
|
| 408 |
+ * @param context Context to initialize config-dependent params from |
|
| 409 |
+ * @param forParent Parent view to monitor |
|
| 410 |
+ */ |
|
| 411 |
+ private ViewDragHelper(Context context, ViewGroup forParent, Callback cb) {
|
|
| 412 |
+ if (forParent == null) {
|
|
| 413 |
+ throw new IllegalArgumentException("Parent view may not be null");
|
|
| 414 |
+ } |
|
| 415 |
+ if (cb == null) {
|
|
| 416 |
+ throw new IllegalArgumentException("Callback may not be null");
|
|
| 417 |
+ } |
|
| 418 |
+ |
|
| 419 |
+ mParentView = forParent; |
|
| 420 |
+ mCallback = cb; |
|
| 421 |
+ |
|
| 422 |
+ final ViewConfiguration vc = ViewConfiguration.get(context); |
|
| 423 |
+ final float density = context.getResources().getDisplayMetrics().density; |
|
| 424 |
+ mEdgeSize = (int) (EDGE_SIZE * density + 0.5f); |
|
| 425 |
+ |
|
| 426 |
+ mTouchSlop = vc.getScaledTouchSlop(); |
|
| 427 |
+ mMaxVelocity = vc.getScaledMaximumFlingVelocity(); |
|
| 428 |
+ mMinVelocity = vc.getScaledMinimumFlingVelocity(); |
|
| 429 |
+ mScroller = ScrollerCompat.create(context, sInterpolator); |
|
| 430 |
+ } |
|
| 431 |
+ |
|
| 432 |
+ /** |
|
| 433 |
+ * Sets the sensitivity of the dragger. |
|
| 434 |
+ * |
|
| 435 |
+ * @param context The application context. |
|
| 436 |
+ * @param sensitivity value between 0 and 1, the final value for touchSlop = |
|
| 437 |
+ * ViewConfiguration.getScaledTouchSlop * (1 / s); |
|
| 438 |
+ */ |
|
| 439 |
+ public void setSensitivity(Context context, float sensitivity) {
|
|
| 440 |
+ float s = Math.max(0f, Math.min(1.0f, sensitivity)); |
|
| 441 |
+ ViewConfiguration viewConfiguration = ViewConfiguration.get(context); |
|
| 442 |
+ mTouchSlop = (int) (viewConfiguration.getScaledTouchSlop() * (1 / s)); |
|
| 443 |
+ } |
|
| 444 |
+ |
|
| 445 |
+ /** |
|
| 446 |
+ * Set the minimum velocity that will be detected as having a magnitude |
|
| 447 |
+ * greater than zero in pixels per second. Callback methods accepting a |
|
| 448 |
+ * velocity will be clamped appropriately. |
|
| 449 |
+ * |
|
| 450 |
+ * @param minVel minimum velocity to detect |
|
| 451 |
+ */ |
|
| 452 |
+ public void setMinVelocity(float minVel) {
|
|
| 453 |
+ mMinVelocity = minVel; |
|
| 454 |
+ } |
|
| 455 |
+ |
|
| 456 |
+ /** |
|
| 457 |
+ * Set the max velocity that will be detected as having a magnitude |
|
| 458 |
+ * greater than zero in pixels per second. Callback methods accepting a |
|
| 459 |
+ * velocity will be clamped appropriately. |
|
| 460 |
+ * |
|
| 461 |
+ * @param maxVel max velocity to detect |
|
| 462 |
+ */ |
|
| 463 |
+ public void setMaxVelocity(float maxVel) {
|
|
| 464 |
+ mMaxVelocity = maxVel; |
|
| 465 |
+ } |
|
| 466 |
+ |
|
| 467 |
+ /** |
|
| 468 |
+ * Return the currently configured minimum velocity. Any flings with a |
|
| 469 |
+ * magnitude less than this value in pixels per second. Callback methods |
|
| 470 |
+ * accepting a velocity will receive zero as a velocity value if the real |
|
| 471 |
+ * detected velocity was below this threshold. |
|
| 472 |
+ * |
|
| 473 |
+ * @return the minimum velocity that will be detected |
|
| 474 |
+ */ |
|
| 475 |
+ public float getMinVelocity() {
|
|
| 476 |
+ return mMinVelocity; |
|
| 477 |
+ } |
|
| 478 |
+ |
|
| 479 |
+ /** |
|
| 480 |
+ * Retrieve the current drag state of this helper. This will return one of |
|
| 481 |
+ * {@link #STATE_IDLE}, {@link #STATE_DRAGGING} or {@link #STATE_SETTLING}.
|
|
| 482 |
+ * |
|
| 483 |
+ * @return The current drag state |
|
| 484 |
+ */ |
|
| 485 |
+ public int getViewDragState() {
|
|
| 486 |
+ return mDragState; |
|
| 487 |
+ } |
|
| 488 |
+ |
|
| 489 |
+ /** |
|
| 490 |
+ * Enable edge tracking for the selected edges of the parent view. The |
|
| 491 |
+ * callback's |
|
| 492 |
+ * {@link me.imid.swipebacklayout.lib.ViewDragHelper.Callback#onEdgeTouched(int, int)}
|
|
| 493 |
+ * and |
|
| 494 |
+ * {@link me.imid.swipebacklayout.lib.ViewDragHelper.Callback#onEdgeDragStarted(int, int)}
|
|
| 495 |
+ * methods will only be invoked for edges for which edge tracking has been |
|
| 496 |
+ * enabled. |
|
| 497 |
+ * |
|
| 498 |
+ * @param edgeFlags Combination of edge flags describing the edges to watch |
|
| 499 |
+ * @see #EDGE_LEFT |
|
| 500 |
+ * @see #EDGE_TOP |
|
| 501 |
+ * @see #EDGE_RIGHT |
|
| 502 |
+ * @see #EDGE_BOTTOM |
|
| 503 |
+ */ |
|
| 504 |
+ public void setEdgeTrackingEnabled(int edgeFlags) {
|
|
| 505 |
+ mTrackingEdges = edgeFlags; |
|
| 506 |
+ } |
|
| 507 |
+ |
|
| 508 |
+ /** |
|
| 509 |
+ * Return the size of an edge. This is the range in pixels along the edges |
|
| 510 |
+ * of this view that will actively detect edge touches or drags if edge |
|
| 511 |
+ * tracking is enabled. |
|
| 512 |
+ * |
|
| 513 |
+ * @return The size of an edge in pixels |
|
| 514 |
+ * @see #setEdgeTrackingEnabled(int) |
|
| 515 |
+ */ |
|
| 516 |
+ public int getEdgeSize() {
|
|
| 517 |
+ return mEdgeSize; |
|
| 518 |
+ } |
|
| 519 |
+ |
|
| 520 |
+ /** |
|
| 521 |
+ * Set the size of an edge. This is the range in pixels along the edges of |
|
| 522 |
+ * this view that will actively detect edge touches or drags if edge |
|
| 523 |
+ * tracking is enabled. |
|
| 524 |
+ * |
|
| 525 |
+ * @param size The size of an edge in pixels |
|
| 526 |
+ */ |
|
| 527 |
+ public void setEdgeSize(int size) {
|
|
| 528 |
+ mEdgeSize = size; |
|
| 529 |
+ } |
|
| 530 |
+ |
|
| 531 |
+ /** |
|
| 532 |
+ * Capture a specific child view for dragging within the parent. The |
|
| 533 |
+ * callback will be notified but |
|
| 534 |
+ * {@link me.imid.swipebacklayout.lib.ViewDragHelper.Callback#tryCaptureView(View, int)}
|
|
| 535 |
+ * will not be asked permission to capture this view. |
|
| 536 |
+ * |
|
| 537 |
+ * @param childView Child view to capture |
|
| 538 |
+ * @param activePointerId ID of the pointer that is dragging the captured |
|
| 539 |
+ * child view |
|
| 540 |
+ */ |
|
| 541 |
+ public void captureChildView(View childView, int activePointerId) {
|
|
| 542 |
+ if (childView.getParent() != mParentView) {
|
|
| 543 |
+ throw new IllegalArgumentException("captureChildView: parameter must be a descendant "
|
|
| 544 |
+ + "of the ViewDragHelper's tracked parent view (" + mParentView + ")");
|
|
| 545 |
+ } |
|
| 546 |
+ |
|
| 547 |
+ mCapturedView = childView; |
|
| 548 |
+ mActivePointerId = activePointerId; |
|
| 549 |
+ mCallback.onViewCaptured(childView, activePointerId); |
|
| 550 |
+ setDragState(STATE_DRAGGING); |
|
| 551 |
+ } |
|
| 552 |
+ |
|
| 553 |
+ /** |
|
| 554 |
+ * @return The currently captured view, or null if no view has been |
|
| 555 |
+ * captured. |
|
| 556 |
+ */ |
|
| 557 |
+ public View getCapturedView() {
|
|
| 558 |
+ return mCapturedView; |
|
| 559 |
+ } |
|
| 560 |
+ |
|
| 561 |
+ /** |
|
| 562 |
+ * @return The ID of the pointer currently dragging the captured view, or |
|
| 563 |
+ * {@link #INVALID_POINTER}.
|
|
| 564 |
+ */ |
|
| 565 |
+ public int getActivePointerId() {
|
|
| 566 |
+ return mActivePointerId; |
|
| 567 |
+ } |
|
| 568 |
+ |
|
| 569 |
+ /** |
|
| 570 |
+ * @return The minimum distance in pixels that the user must travel to |
|
| 571 |
+ * initiate a drag |
|
| 572 |
+ */ |
|
| 573 |
+ public int getTouchSlop() {
|
|
| 574 |
+ return mTouchSlop; |
|
| 575 |
+ } |
|
| 576 |
+ |
|
| 577 |
+ /** |
|
| 578 |
+ * The result of a call to this method is equivalent to |
|
| 579 |
+ * {@link #processTouchEvent(MotionEvent)} receiving an
|
|
| 580 |
+ * ACTION_CANCEL event. |
|
| 581 |
+ */ |
|
| 582 |
+ public void cancel() {
|
|
| 583 |
+ mActivePointerId = INVALID_POINTER; |
|
| 584 |
+ clearMotionHistory(); |
|
| 585 |
+ |
|
| 586 |
+ if (mVelocityTracker != null) {
|
|
| 587 |
+ mVelocityTracker.recycle(); |
|
| 588 |
+ mVelocityTracker = null; |
|
| 589 |
+ } |
|
| 590 |
+ } |
|
| 591 |
+ |
|
| 592 |
+ /** |
|
| 593 |
+ * {@link #cancel()}, but also abort all motion in progress and snap to the
|
|
| 594 |
+ * end of any animation. |
|
| 595 |
+ */ |
|
| 596 |
+ public void abort() {
|
|
| 597 |
+ cancel(); |
|
| 598 |
+ if (mDragState == STATE_SETTLING) {
|
|
| 599 |
+ final int oldX = mScroller.getCurrX(); |
|
| 600 |
+ final int oldY = mScroller.getCurrY(); |
|
| 601 |
+ mScroller.abortAnimation(); |
|
| 602 |
+ final int newX = mScroller.getCurrX(); |
|
| 603 |
+ final int newY = mScroller.getCurrY(); |
|
| 604 |
+ mCallback.onViewPositionChanged(mCapturedView, newX, newY, newX - oldX, newY - oldY); |
|
| 605 |
+ } |
|
| 606 |
+ setDragState(STATE_IDLE); |
|
| 607 |
+ } |
|
| 608 |
+ |
|
| 609 |
+ /** |
|
| 610 |
+ * Animate the view <code>child</code> to the given (left, top) position. If |
|
| 611 |
+ * this method returns true, the caller should invoke |
|
| 612 |
+ * {@link #continueSettling(boolean)} on each subsequent frame to continue
|
|
| 613 |
+ * the motion until it returns false. If this method returns false there is |
|
| 614 |
+ * no further work to do to complete the movement. |
|
| 615 |
+ * <p> |
|
| 616 |
+ * This operation does not count as a capture event, though |
|
| 617 |
+ * {@link #getCapturedView()} will still report the sliding view while the
|
|
| 618 |
+ * slide is in progress. |
|
| 619 |
+ * </p> |
|
| 620 |
+ * |
|
| 621 |
+ * @param child Child view to capture and animate |
|
| 622 |
+ * @param finalLeft Final left position of child |
|
| 623 |
+ * @param finalTop Final top position of child |
|
| 624 |
+ * @return true if animation should continue through |
|
| 625 |
+ * {@link #continueSettling(boolean)} calls
|
|
| 626 |
+ */ |
|
| 627 |
+ public boolean smoothSlideViewTo(View child, int finalLeft, int finalTop) {
|
|
| 628 |
+ mCapturedView = child; |
|
| 629 |
+ mActivePointerId = INVALID_POINTER; |
|
| 630 |
+ |
|
| 631 |
+ return forceSettleCapturedViewAt(finalLeft, finalTop, 0, 0); |
|
| 632 |
+ } |
|
| 633 |
+ |
|
| 634 |
+ /** |
|
| 635 |
+ * Settle the captured view at the given (left, top) position. The |
|
| 636 |
+ * appropriate velocity from prior motion will be taken into account. If |
|
| 637 |
+ * this method returns true, the caller should invoke |
|
| 638 |
+ * {@link #continueSettling(boolean)} on each subsequent frame to continue
|
|
| 639 |
+ * the motion until it returns false. If this method returns false there is |
|
| 640 |
+ * no further work to do to complete the movement. |
|
| 641 |
+ * |
|
| 642 |
+ * @param finalLeft Settled left edge position for the captured view |
|
| 643 |
+ * @param finalTop Settled top edge position for the captured view |
|
| 644 |
+ * @return true if animation should continue through |
|
| 645 |
+ * {@link #continueSettling(boolean)} calls
|
|
| 646 |
+ */ |
|
| 647 |
+ public boolean settleCapturedViewAt(int finalLeft, int finalTop) {
|
|
| 648 |
+ if (!mReleaseInProgress) {
|
|
| 649 |
+ throw new IllegalStateException("Cannot settleCapturedViewAt outside of a call to "
|
|
| 650 |
+ + "Callback#onViewReleased"); |
|
| 651 |
+ } |
|
| 652 |
+ |
|
| 653 |
+ return forceSettleCapturedViewAt(finalLeft, finalTop, |
|
| 654 |
+ (int) VelocityTrackerCompat.getXVelocity(mVelocityTracker, mActivePointerId), |
|
| 655 |
+ (int) VelocityTrackerCompat.getYVelocity(mVelocityTracker, mActivePointerId)); |
|
| 656 |
+ } |
|
| 657 |
+ |
|
| 658 |
+ /** |
|
| 659 |
+ * Settle the captured view at the given (left, top) position. |
|
| 660 |
+ * |
|
| 661 |
+ * @param finalLeft Target left position for the captured view |
|
| 662 |
+ * @param finalTop Target top position for the captured view |
|
| 663 |
+ * @param xvel Horizontal velocity |
|
| 664 |
+ * @param yvel Vertical velocity |
|
| 665 |
+ * @return true if animation should continue through |
|
| 666 |
+ * {@link #continueSettling(boolean)} calls
|
|
| 667 |
+ */ |
|
| 668 |
+ private boolean forceSettleCapturedViewAt(int finalLeft, int finalTop, int xvel, int yvel) {
|
|
| 669 |
+ final int startLeft = mCapturedView.getLeft(); |
|
| 670 |
+ final int startTop = mCapturedView.getTop(); |
|
| 671 |
+ final int dx = finalLeft - startLeft; |
|
| 672 |
+ final int dy = finalTop - startTop; |
|
| 673 |
+ |
|
| 674 |
+ if (dx == 0 && dy == 0) {
|
|
| 675 |
+ // Nothing to do. Send callbacks, be done. |
|
| 676 |
+ mScroller.abortAnimation(); |
|
| 677 |
+ setDragState(STATE_IDLE); |
|
| 678 |
+ return false; |
|
| 679 |
+ } |
|
| 680 |
+ |
|
| 681 |
+ final int duration = computeSettleDuration(mCapturedView, dx, dy, xvel, yvel); |
|
| 682 |
+ mScroller.startScroll(startLeft, startTop, dx, dy, duration); |
|
| 683 |
+ |
|
| 684 |
+ setDragState(STATE_SETTLING); |
|
| 685 |
+ return true; |
|
| 686 |
+ } |
|
| 687 |
+ |
|
| 688 |
+ private int computeSettleDuration(View child, int dx, int dy, int xvel, int yvel) {
|
|
| 689 |
+ xvel = clampMag(xvel, (int) mMinVelocity, (int) mMaxVelocity); |
|
| 690 |
+ yvel = clampMag(yvel, (int) mMinVelocity, (int) mMaxVelocity); |
|
| 691 |
+ final int absDx = Math.abs(dx); |
|
| 692 |
+ final int absDy = Math.abs(dy); |
|
| 693 |
+ final int absXVel = Math.abs(xvel); |
|
| 694 |
+ final int absYVel = Math.abs(yvel); |
|
| 695 |
+ final int addedVel = absXVel + absYVel; |
|
| 696 |
+ final int addedDistance = absDx + absDy; |
|
| 697 |
+ |
|
| 698 |
+ final float xweight = xvel != 0 ? (float) absXVel / addedVel : (float) absDx |
|
| 699 |
+ / addedDistance; |
|
| 700 |
+ final float yweight = yvel != 0 ? (float) absYVel / addedVel : (float) absDy |
|
| 701 |
+ / addedDistance; |
|
| 702 |
+ |
|
| 703 |
+ int xduration = computeAxisDuration(dx, xvel, mCallback.getViewHorizontalDragRange(child)); |
|
| 704 |
+ int yduration = computeAxisDuration(dy, yvel, mCallback.getViewVerticalDragRange(child)); |
|
| 705 |
+ |
|
| 706 |
+ return (int) (xduration * xweight + yduration * yweight); |
|
| 707 |
+ } |
|
| 708 |
+ |
|
| 709 |
+ private int computeAxisDuration(int delta, int velocity, int motionRange) {
|
|
| 710 |
+ if (delta == 0) {
|
|
| 711 |
+ return 0; |
|
| 712 |
+ } |
|
| 713 |
+ |
|
| 714 |
+ final int width = mParentView.getWidth(); |
|
| 715 |
+ final int halfWidth = width / 2; |
|
| 716 |
+ final float distanceRatio = Math.min(1f, (float) Math.abs(delta) / width); |
|
| 717 |
+ final float distance = halfWidth + halfWidth |
|
| 718 |
+ * distanceInfluenceForSnapDuration(distanceRatio); |
|
| 719 |
+ |
|
| 720 |
+ int duration; |
|
| 721 |
+ velocity = Math.abs(velocity); |
|
| 722 |
+ if (velocity > 0) {
|
|
| 723 |
+ duration = 4 * Math.round(1000 * Math.abs(distance / velocity)); |
|
| 724 |
+ } else {
|
|
| 725 |
+ final float range = (float) Math.abs(delta) / motionRange; |
|
| 726 |
+ duration = (int) ((range + 1) * BASE_SETTLE_DURATION); |
|
| 727 |
+ } |
|
| 728 |
+ return Math.min(duration, MAX_SETTLE_DURATION); |
|
| 729 |
+ } |
|
| 730 |
+ |
|
| 731 |
+ /** |
|
| 732 |
+ * Clamp the magnitude of value for absMin and absMax. If the value is below |
|
| 733 |
+ * the minimum, it will be clamped to zero. If the value is above the |
|
| 734 |
+ * maximum, it will be clamped to the maximum. |
|
| 735 |
+ * |
|
| 736 |
+ * @param value Value to clamp |
|
| 737 |
+ * @param absMin Absolute value of the minimum significant value to return |
|
| 738 |
+ * @param absMax Absolute value of the maximum value to return |
|
| 739 |
+ * @return The clamped value with the same sign as <code>value</code> |
|
| 740 |
+ */ |
|
| 741 |
+ private int clampMag(int value, int absMin, int absMax) {
|
|
| 742 |
+ final int absValue = Math.abs(value); |
|
| 743 |
+ if (absValue < absMin) |
|
| 744 |
+ return 0; |
|
| 745 |
+ if (absValue > absMax) |
|
| 746 |
+ return value > 0 ? absMax : -absMax; |
|
| 747 |
+ return value; |
|
| 748 |
+ } |
|
| 749 |
+ |
|
| 750 |
+ /** |
|
| 751 |
+ * Clamp the magnitude of value for absMin and absMax. If the value is below |
|
| 752 |
+ * the minimum, it will be clamped to zero. If the value is above the |
|
| 753 |
+ * maximum, it will be clamped to the maximum. |
|
| 754 |
+ * |
|
| 755 |
+ * @param value Value to clamp |
|
| 756 |
+ * @param absMin Absolute value of the minimum significant value to return |
|
| 757 |
+ * @param absMax Absolute value of the maximum value to return |
|
| 758 |
+ * @return The clamped value with the same sign as <code>value</code> |
|
| 759 |
+ */ |
|
| 760 |
+ private float clampMag(float value, float absMin, float absMax) {
|
|
| 761 |
+ final float absValue = Math.abs(value); |
|
| 762 |
+ if (absValue < absMin) |
|
| 763 |
+ return 0; |
|
| 764 |
+ if (absValue > absMax) |
|
| 765 |
+ return value > 0 ? absMax : -absMax; |
|
| 766 |
+ return value; |
|
| 767 |
+ } |
|
| 768 |
+ |
|
| 769 |
+ private float distanceInfluenceForSnapDuration(float f) {
|
|
| 770 |
+ f -= 0.5f; // center the values about 0. |
|
| 771 |
+ f *= 0.3f * Math.PI / 2.0f; |
|
| 772 |
+ return (float) Math.sin(f); |
|
| 773 |
+ } |
|
| 774 |
+ |
|
| 775 |
+ /** |
|
| 776 |
+ * Settle the captured view based on standard free-moving fling behavior. |
|
| 777 |
+ * The caller should invoke {@link #continueSettling(boolean)} on each
|
|
| 778 |
+ * subsequent frame to continue the motion until it returns false. |
|
| 779 |
+ * |
|
| 780 |
+ * @param minLeft Minimum X position for the view's left edge |
|
| 781 |
+ * @param minTop Minimum Y position for the view's top edge |
|
| 782 |
+ * @param maxLeft Maximum X position for the view's left edge |
|
| 783 |
+ * @param maxTop Maximum Y position for the view's top edge |
|
| 784 |
+ */ |
|
| 785 |
+ public void flingCapturedView(int minLeft, int minTop, int maxLeft, int maxTop) {
|
|
| 786 |
+ if (!mReleaseInProgress) {
|
|
| 787 |
+ throw new IllegalStateException("Cannot flingCapturedView outside of a call to "
|
|
| 788 |
+ + "Callback#onViewReleased"); |
|
| 789 |
+ } |
|
| 790 |
+ |
|
| 791 |
+ mScroller.fling(mCapturedView.getLeft(), mCapturedView.getTop(), |
|
| 792 |
+ (int) VelocityTrackerCompat.getXVelocity(mVelocityTracker, mActivePointerId), |
|
| 793 |
+ (int) VelocityTrackerCompat.getYVelocity(mVelocityTracker, mActivePointerId), |
|
| 794 |
+ minLeft, maxLeft, minTop, maxTop); |
|
| 795 |
+ |
|
| 796 |
+ setDragState(STATE_SETTLING); |
|
| 797 |
+ } |
|
| 798 |
+ |
|
| 799 |
+ /** |
|
| 800 |
+ * Move the captured settling view by the appropriate amount for the current |
|
| 801 |
+ * time. If <code>continueSettling</code> returns true, the caller should |
|
| 802 |
+ * call it again on the next frame to continue. |
|
| 803 |
+ * |
|
| 804 |
+ * @param deferCallbacks true if state callbacks should be deferred via |
|
| 805 |
+ * posted message. Set this to true if you are calling this |
|
| 806 |
+ * method from {@link View#computeScroll()} or
|
|
| 807 |
+ * similar methods invoked as part of layout or drawing. |
|
| 808 |
+ * @return true if settle is still in progress |
|
| 809 |
+ */ |
|
| 810 |
+ public boolean continueSettling(boolean deferCallbacks) {
|
|
| 811 |
+ if (mDragState == STATE_SETTLING) {
|
|
| 812 |
+ boolean keepGoing = mScroller.computeScrollOffset(); |
|
| 813 |
+ final int x = mScroller.getCurrX(); |
|
| 814 |
+ final int y = mScroller.getCurrY(); |
|
| 815 |
+ final int dx = x - mCapturedView.getLeft(); |
|
| 816 |
+ final int dy = y - mCapturedView.getTop(); |
|
| 817 |
+ |
|
| 818 |
+ if (dx != 0) {
|
|
| 819 |
+ mCapturedView.offsetLeftAndRight(dx); |
|
| 820 |
+ } |
|
| 821 |
+ if (dy != 0) {
|
|
| 822 |
+ mCapturedView.offsetTopAndBottom(dy); |
|
| 823 |
+ } |
|
| 824 |
+ |
|
| 825 |
+ if (dx != 0 || dy != 0) {
|
|
| 826 |
+ mCallback.onViewPositionChanged(mCapturedView, x, y, dx, dy); |
|
| 827 |
+ } |
|
| 828 |
+ |
|
| 829 |
+ if (keepGoing && x == mScroller.getFinalX() && y == mScroller.getFinalY()) {
|
|
| 830 |
+ // Close enough. The interpolator/scroller might think we're |
|
| 831 |
+ // still moving |
|
| 832 |
+ // but the user sure doesn't. |
|
| 833 |
+ mScroller.abortAnimation(); |
|
| 834 |
+ keepGoing = mScroller.isFinished(); |
|
| 835 |
+ } |
|
| 836 |
+ |
|
| 837 |
+ if (!keepGoing) {
|
|
| 838 |
+ if (deferCallbacks) {
|
|
| 839 |
+ mParentView.post(mSetIdleRunnable); |
|
| 840 |
+ } else {
|
|
| 841 |
+ setDragState(STATE_IDLE); |
|
| 842 |
+ } |
|
| 843 |
+ } |
|
| 844 |
+ } |
|
| 845 |
+ |
|
| 846 |
+ return mDragState == STATE_SETTLING; |
|
| 847 |
+ } |
|
| 848 |
+ |
|
| 849 |
+ /** |
|
| 850 |
+ * Like all callback events this must happen on the UI thread, but release |
|
| 851 |
+ * involves some extra semantics. During a release (mReleaseInProgress) is |
|
| 852 |
+ * the only time it is valid to call {@link #settleCapturedViewAt(int, int)}
|
|
| 853 |
+ * or {@link #flingCapturedView(int, int, int, int)}.
|
|
| 854 |
+ */ |
|
| 855 |
+ private void dispatchViewReleased(float xvel, float yvel) {
|
|
| 856 |
+ mReleaseInProgress = true; |
|
| 857 |
+ mCallback.onViewReleased(mCapturedView, xvel, yvel); |
|
| 858 |
+ mReleaseInProgress = false; |
|
| 859 |
+ |
|
| 860 |
+ if (mDragState == STATE_DRAGGING) {
|
|
| 861 |
+ // onViewReleased didn't call a method that would have changed this. |
|
| 862 |
+ // Go idle. |
|
| 863 |
+ setDragState(STATE_IDLE); |
|
| 864 |
+ } |
|
| 865 |
+ } |
|
| 866 |
+ |
|
| 867 |
+ private void clearMotionHistory() {
|
|
| 868 |
+ if (mInitialMotionX == null) {
|
|
| 869 |
+ return; |
|
| 870 |
+ } |
|
| 871 |
+ Arrays.fill(mInitialMotionX, 0); |
|
| 872 |
+ Arrays.fill(mInitialMotionY, 0); |
|
| 873 |
+ Arrays.fill(mLastMotionX, 0); |
|
| 874 |
+ Arrays.fill(mLastMotionY, 0); |
|
| 875 |
+ Arrays.fill(mInitialEdgeTouched, 0); |
|
| 876 |
+ Arrays.fill(mEdgeDragsInProgress, 0); |
|
| 877 |
+ Arrays.fill(mEdgeDragsLocked, 0); |
|
| 878 |
+ mPointersDown = 0; |
|
| 879 |
+ } |
|
| 880 |
+ |
|
| 881 |
+ private void clearMotionHistory(int pointerId) {
|
|
| 882 |
+ if (mInitialMotionX == null) {
|
|
| 883 |
+ return; |
|
| 884 |
+ } |
|
| 885 |
+ mInitialMotionX[pointerId] = 0; |
|
| 886 |
+ mInitialMotionY[pointerId] = 0; |
|
| 887 |
+ mLastMotionX[pointerId] = 0; |
|
| 888 |
+ mLastMotionY[pointerId] = 0; |
|
| 889 |
+ mInitialEdgeTouched[pointerId] = 0; |
|
| 890 |
+ mEdgeDragsInProgress[pointerId] = 0; |
|
| 891 |
+ mEdgeDragsLocked[pointerId] = 0; |
|
| 892 |
+ mPointersDown &= ~(1 << pointerId); |
|
| 893 |
+ } |
|
| 894 |
+ |
|
| 895 |
+ private void ensureMotionHistorySizeForId(int pointerId) {
|
|
| 896 |
+ if (mInitialMotionX == null || mInitialMotionX.length <= pointerId) {
|
|
| 897 |
+ float[] imx = new float[pointerId + 1]; |
|
| 898 |
+ float[] imy = new float[pointerId + 1]; |
|
| 899 |
+ float[] lmx = new float[pointerId + 1]; |
|
| 900 |
+ float[] lmy = new float[pointerId + 1]; |
|
| 901 |
+ int[] iit = new int[pointerId + 1]; |
|
| 902 |
+ int[] edip = new int[pointerId + 1]; |
|
| 903 |
+ int[] edl = new int[pointerId + 1]; |
|
| 904 |
+ |
|
| 905 |
+ if (mInitialMotionX != null) {
|
|
| 906 |
+ System.arraycopy(mInitialMotionX, 0, imx, 0, mInitialMotionX.length); |
|
| 907 |
+ System.arraycopy(mInitialMotionY, 0, imy, 0, mInitialMotionY.length); |
|
| 908 |
+ System.arraycopy(mLastMotionX, 0, lmx, 0, mLastMotionX.length); |
|
| 909 |
+ System.arraycopy(mLastMotionY, 0, lmy, 0, mLastMotionY.length); |
|
| 910 |
+ System.arraycopy(mInitialEdgeTouched, 0, iit, 0, mInitialEdgeTouched.length); |
|
| 911 |
+ System.arraycopy(mEdgeDragsInProgress, 0, edip, 0, mEdgeDragsInProgress.length); |
|
| 912 |
+ System.arraycopy(mEdgeDragsLocked, 0, edl, 0, mEdgeDragsLocked.length); |
|
| 913 |
+ } |
|
| 914 |
+ |
|
| 915 |
+ mInitialMotionX = imx; |
|
| 916 |
+ mInitialMotionY = imy; |
|
| 917 |
+ mLastMotionX = lmx; |
|
| 918 |
+ mLastMotionY = lmy; |
|
| 919 |
+ mInitialEdgeTouched = iit; |
|
| 920 |
+ mEdgeDragsInProgress = edip; |
|
| 921 |
+ mEdgeDragsLocked = edl; |
|
| 922 |
+ } |
|
| 923 |
+ } |
|
| 924 |
+ |
|
| 925 |
+ private void saveInitialMotion(float x, float y, int pointerId) {
|
|
| 926 |
+ ensureMotionHistorySizeForId(pointerId); |
|
| 927 |
+ mInitialMotionX[pointerId] = mLastMotionX[pointerId] = x; |
|
| 928 |
+ mInitialMotionY[pointerId] = mLastMotionY[pointerId] = y; |
|
| 929 |
+ mInitialEdgeTouched[pointerId] = getEdgeTouched((int) x, (int) y); |
|
| 930 |
+ mPointersDown |= 1 << pointerId; |
|
| 931 |
+ } |
|
| 932 |
+ |
|
| 933 |
+ private void saveLastMotion(MotionEvent ev) {
|
|
| 934 |
+ final int pointerCount = MotionEventCompat.getPointerCount(ev); |
|
| 935 |
+ for (int i = 0; i < pointerCount; i++) {
|
|
| 936 |
+ final int pointerId = MotionEventCompat.getPointerId(ev, i); |
|
| 937 |
+ final float x = MotionEventCompat.getX(ev, i); |
|
| 938 |
+ final float y = MotionEventCompat.getY(ev, i); |
|
| 939 |
+ mLastMotionX[pointerId] = x; |
|
| 940 |
+ mLastMotionY[pointerId] = y; |
|
| 941 |
+ } |
|
| 942 |
+ } |
|
| 943 |
+ |
|
| 944 |
+ /** |
|
| 945 |
+ * Check if the given pointer ID represents a pointer that is currently down |
|
| 946 |
+ * (to the best of the ViewDragHelper's knowledge). |
|
| 947 |
+ * <p> |
|
| 948 |
+ * The state used to report this information is populated by the methods |
|
| 949 |
+ * {@link #shouldInterceptTouchEvent(MotionEvent)} or
|
|
| 950 |
+ * {@link #processTouchEvent(MotionEvent)}. If one of these
|
|
| 951 |
+ * methods has not been called for all relevant MotionEvents to track, the |
|
| 952 |
+ * information reported by this method may be stale or incorrect. |
|
| 953 |
+ * </p> |
|
| 954 |
+ * |
|
| 955 |
+ * @param pointerId pointer ID to check; corresponds to IDs provided by |
|
| 956 |
+ * MotionEvent |
|
| 957 |
+ * @return true if the pointer with the given ID is still down |
|
| 958 |
+ */ |
|
| 959 |
+ public boolean isPointerDown(int pointerId) {
|
|
| 960 |
+ return (mPointersDown & 1 << pointerId) != 0; |
|
| 961 |
+ } |
|
| 962 |
+ |
|
| 963 |
+ void setDragState(int state) {
|
|
| 964 |
+ if (mDragState != state) {
|
|
| 965 |
+ mDragState = state; |
|
| 966 |
+ mCallback.onViewDragStateChanged(state); |
|
| 967 |
+ if (state == STATE_IDLE) {
|
|
| 968 |
+ mCapturedView = null; |
|
| 969 |
+ } |
|
| 970 |
+ } |
|
| 971 |
+ } |
|
| 972 |
+ |
|
| 973 |
+ /** |
|
| 974 |
+ * Attempt to capture the view with the given pointer ID. The callback will |
|
| 975 |
+ * be involved. This will put us into the "dragging" state. If we've already |
|
| 976 |
+ * captured this view with this pointer this method will immediately return |
|
| 977 |
+ * true without consulting the callback. |
|
| 978 |
+ * |
|
| 979 |
+ * @param toCapture View to capture |
|
| 980 |
+ * @param pointerId Pointer to capture with |
|
| 981 |
+ * @return true if capture was successful |
|
| 982 |
+ */ |
|
| 983 |
+ boolean tryCaptureViewForDrag(View toCapture, int pointerId) {
|
|
| 984 |
+ if (toCapture == mCapturedView && mActivePointerId == pointerId) {
|
|
| 985 |
+ // Already done! |
|
| 986 |
+ return true; |
|
| 987 |
+ } |
|
| 988 |
+ if (toCapture != null && mCallback.tryCaptureView(toCapture, pointerId)) {
|
|
| 989 |
+ mActivePointerId = pointerId; |
|
| 990 |
+ captureChildView(toCapture, pointerId); |
|
| 991 |
+ return true; |
|
| 992 |
+ } |
|
| 993 |
+ return false; |
|
| 994 |
+ } |
|
| 995 |
+ |
|
| 996 |
+ /** |
|
| 997 |
+ * Tests scrollability within child views of v given a delta of dx. |
|
| 998 |
+ * |
|
| 999 |
+ * @param v View to test for horizontal scrollability |
|
| 1000 |
+ * @param checkV Whether the view v passed should itself be checked for |
|
| 1001 |
+ * scrollability (true), or just its children (false). |
|
| 1002 |
+ * @param dx Delta scrolled in pixels along the X axis |
|
| 1003 |
+ * @param dy Delta scrolled in pixels along the Y axis |
|
| 1004 |
+ * @param x X coordinate of the active touch point |
|
| 1005 |
+ * @param y Y coordinate of the active touch point |
|
| 1006 |
+ * @return true if child views of v can be scrolled by delta of dx. |
|
| 1007 |
+ */ |
|
| 1008 |
+ protected boolean canScroll(View v, boolean checkV, int dx, int dy, int x, int y) {
|
|
| 1009 |
+ if (v instanceof ViewGroup) {
|
|
| 1010 |
+ final ViewGroup group = (ViewGroup) v; |
|
| 1011 |
+ final int scrollX = v.getScrollX(); |
|
| 1012 |
+ final int scrollY = v.getScrollY(); |
|
| 1013 |
+ final int count = group.getChildCount(); |
|
| 1014 |
+ // Count backwards - let topmost views consume scroll distance |
|
| 1015 |
+ // first. |
|
| 1016 |
+ for (int i = count - 1; i >= 0; i--) {
|
|
| 1017 |
+ // TODO: Add versioned support here for transformed views. |
|
| 1018 |
+ // This will not work for transformed views in Honeycomb+ |
|
| 1019 |
+ final View child = group.getChildAt(i); |
|
| 1020 |
+ if (x + scrollX >= child.getLeft() |
|
| 1021 |
+ && x + scrollX < child.getRight() |
|
| 1022 |
+ && y + scrollY >= child.getTop() |
|
| 1023 |
+ && y + scrollY < child.getBottom() |
|
| 1024 |
+ && canScroll(child, true, dx, dy, x + scrollX - child.getLeft(), y |
|
| 1025 |
+ + scrollY - child.getTop())) {
|
|
| 1026 |
+ return true; |
|
| 1027 |
+ } |
|
| 1028 |
+ } |
|
| 1029 |
+ } |
|
| 1030 |
+ |
|
| 1031 |
+ return checkV |
|
| 1032 |
+ && (ViewCompat.canScrollHorizontally(v, -dx) || ViewCompat.canScrollVertically(v, |
|
| 1033 |
+ -dy)); |
|
| 1034 |
+ } |
|
| 1035 |
+ |
|
| 1036 |
+ /** |
|
| 1037 |
+ * Check if this event as provided to the parent view's |
|
| 1038 |
+ * onInterceptTouchEvent should cause the parent to intercept the touch |
|
| 1039 |
+ * event stream. |
|
| 1040 |
+ * |
|
| 1041 |
+ * @param ev MotionEvent provided to onInterceptTouchEvent |
|
| 1042 |
+ * @return true if the parent view should return true from |
|
| 1043 |
+ * onInterceptTouchEvent |
|
| 1044 |
+ */ |
|
| 1045 |
+ public boolean shouldInterceptTouchEvent(MotionEvent ev) {
|
|
| 1046 |
+ final int action = MotionEventCompat.getActionMasked(ev); |
|
| 1047 |
+ final int actionIndex = MotionEventCompat.getActionIndex(ev); |
|
| 1048 |
+ |
|
| 1049 |
+ if (action == MotionEvent.ACTION_DOWN) {
|
|
| 1050 |
+ // Reset things for a new event stream, just in case we didn't get |
|
| 1051 |
+ // the whole previous stream. |
|
| 1052 |
+ cancel(); |
|
| 1053 |
+ } |
|
| 1054 |
+ |
|
| 1055 |
+ if (mVelocityTracker == null) {
|
|
| 1056 |
+ mVelocityTracker = VelocityTracker.obtain(); |
|
| 1057 |
+ } |
|
| 1058 |
+ mVelocityTracker.addMovement(ev); |
|
| 1059 |
+ |
|
| 1060 |
+ switch (action) {
|
|
| 1061 |
+ case MotionEvent.ACTION_DOWN: {
|
|
| 1062 |
+ final float x = ev.getX(); |
|
| 1063 |
+ final float y = ev.getY(); |
|
| 1064 |
+ final int pointerId = MotionEventCompat.getPointerId(ev, 0); |
|
| 1065 |
+ saveInitialMotion(x, y, pointerId); |
|
| 1066 |
+ |
|
| 1067 |
+ final View toCapture = findTopChildUnder((int) x, (int) y); |
|
| 1068 |
+ |
|
| 1069 |
+ // Catch a settling view if possible. |
|
| 1070 |
+ if (toCapture == mCapturedView && mDragState == STATE_SETTLING) {
|
|
| 1071 |
+ tryCaptureViewForDrag(toCapture, pointerId); |
|
| 1072 |
+ } |
|
| 1073 |
+ |
|
| 1074 |
+ final int edgesTouched = mInitialEdgeTouched[pointerId]; |
|
| 1075 |
+ if ((edgesTouched & mTrackingEdges) != 0) {
|
|
| 1076 |
+ mCallback.onEdgeTouched(edgesTouched & mTrackingEdges, pointerId); |
|
| 1077 |
+ } |
|
| 1078 |
+ break; |
|
| 1079 |
+ } |
|
| 1080 |
+ |
|
| 1081 |
+ case MotionEventCompat.ACTION_POINTER_DOWN: {
|
|
| 1082 |
+ final int pointerId = MotionEventCompat.getPointerId(ev, actionIndex); |
|
| 1083 |
+ final float x = MotionEventCompat.getX(ev, actionIndex); |
|
| 1084 |
+ final float y = MotionEventCompat.getY(ev, actionIndex); |
|
| 1085 |
+ |
|
| 1086 |
+ saveInitialMotion(x, y, pointerId); |
|
| 1087 |
+ |
|
| 1088 |
+ // A ViewDragHelper can only manipulate one view at a time. |
|
| 1089 |
+ if (mDragState == STATE_IDLE) {
|
|
| 1090 |
+ final int edgesTouched = mInitialEdgeTouched[pointerId]; |
|
| 1091 |
+ if ((edgesTouched & mTrackingEdges) != 0) {
|
|
| 1092 |
+ mCallback.onEdgeTouched(edgesTouched & mTrackingEdges, pointerId); |
|
| 1093 |
+ } |
|
| 1094 |
+ } else if (mDragState == STATE_SETTLING) {
|
|
| 1095 |
+ // Catch a settling view if possible. |
|
| 1096 |
+ final View toCapture = findTopChildUnder((int) x, (int) y); |
|
| 1097 |
+ if (toCapture == mCapturedView) {
|
|
| 1098 |
+ tryCaptureViewForDrag(toCapture, pointerId); |
|
| 1099 |
+ } |
|
| 1100 |
+ } |
|
| 1101 |
+ break; |
|
| 1102 |
+ } |
|
| 1103 |
+ |
|
| 1104 |
+ case MotionEvent.ACTION_MOVE: {
|
|
| 1105 |
+ // First to cross a touch slop over a draggable view wins. Also |
|
| 1106 |
+ // report edge drags. |
|
| 1107 |
+ final int pointerCount = MotionEventCompat.getPointerCount(ev); |
|
| 1108 |
+ for (int i = 0; i < pointerCount; i++) {
|
|
| 1109 |
+ final int pointerId = MotionEventCompat.getPointerId(ev, i); |
|
| 1110 |
+ final float x = MotionEventCompat.getX(ev, i); |
|
| 1111 |
+ final float y = MotionEventCompat.getY(ev, i); |
|
| 1112 |
+ final float dx = x - mInitialMotionX[pointerId]; |
|
| 1113 |
+ final float dy = y - mInitialMotionY[pointerId]; |
|
| 1114 |
+ |
|
| 1115 |
+ reportNewEdgeDrags(dx, dy, pointerId); |
|
| 1116 |
+ if (mDragState == STATE_DRAGGING) {
|
|
| 1117 |
+ // Callback might have started an edge drag |
|
| 1118 |
+ break; |
|
| 1119 |
+ } |
|
| 1120 |
+ |
|
| 1121 |
+ final View toCapture = findTopChildUnder((int) x, (int) y); |
|
| 1122 |
+ if (toCapture != null && checkTouchSlop(toCapture, dx, dy) |
|
| 1123 |
+ && tryCaptureViewForDrag(toCapture, pointerId)) {
|
|
| 1124 |
+ break; |
|
| 1125 |
+ } |
|
| 1126 |
+ } |
|
| 1127 |
+ saveLastMotion(ev); |
|
| 1128 |
+ break; |
|
| 1129 |
+ } |
|
| 1130 |
+ |
|
| 1131 |
+ case MotionEventCompat.ACTION_POINTER_UP: {
|
|
| 1132 |
+ final int pointerId = MotionEventCompat.getPointerId(ev, actionIndex); |
|
| 1133 |
+ clearMotionHistory(pointerId); |
|
| 1134 |
+ break; |
|
| 1135 |
+ } |
|
| 1136 |
+ |
|
| 1137 |
+ case MotionEvent.ACTION_UP: |
|
| 1138 |
+ case MotionEvent.ACTION_CANCEL: {
|
|
| 1139 |
+ cancel(); |
|
| 1140 |
+ break; |
|
| 1141 |
+ } |
|
| 1142 |
+ } |
|
| 1143 |
+ |
|
| 1144 |
+ return mDragState == STATE_DRAGGING; |
|
| 1145 |
+ } |
|
| 1146 |
+ |
|
| 1147 |
+ /** |
|
| 1148 |
+ * Process a touch event received by the parent view. This method will |
|
| 1149 |
+ * dispatch callback events as needed before returning. The parent view's |
|
| 1150 |
+ * onTouchEvent implementation should call this. |
|
| 1151 |
+ * |
|
| 1152 |
+ * @param ev The touch event received by the parent view |
|
| 1153 |
+ */ |
|
| 1154 |
+ public void processTouchEvent(MotionEvent ev) {
|
|
| 1155 |
+ final int action = MotionEventCompat.getActionMasked(ev); |
|
| 1156 |
+ final int actionIndex = MotionEventCompat.getActionIndex(ev); |
|
| 1157 |
+ |
|
| 1158 |
+ if (action == MotionEvent.ACTION_DOWN) {
|
|
| 1159 |
+ // Reset things for a new event stream, just in case we didn't get |
|
| 1160 |
+ // the whole previous stream. |
|
| 1161 |
+ cancel(); |
|
| 1162 |
+ } |
|
| 1163 |
+ |
|
| 1164 |
+ if (mVelocityTracker == null) {
|
|
| 1165 |
+ mVelocityTracker = VelocityTracker.obtain(); |
|
| 1166 |
+ } |
|
| 1167 |
+ mVelocityTracker.addMovement(ev); |
|
| 1168 |
+ |
|
| 1169 |
+ switch (action) {
|
|
| 1170 |
+ case MotionEvent.ACTION_DOWN: {
|
|
| 1171 |
+ final float x = ev.getX(); |
|
| 1172 |
+ final float y = ev.getY(); |
|
| 1173 |
+ final int pointerId = MotionEventCompat.getPointerId(ev, 0); |
|
| 1174 |
+ final View toCapture = findTopChildUnder((int) x, (int) y); |
|
| 1175 |
+ |
|
| 1176 |
+ saveInitialMotion(x, y, pointerId); |
|
| 1177 |
+ |
|
| 1178 |
+ // Since the parent is already directly processing this touch |
|
| 1179 |
+ // event, |
|
| 1180 |
+ // there is no reason to delay for a slop before dragging. |
|
| 1181 |
+ // Start immediately if possible. |
|
| 1182 |
+ tryCaptureViewForDrag(toCapture, pointerId); |
|
| 1183 |
+ |
|
| 1184 |
+ final int edgesTouched = mInitialEdgeTouched[pointerId]; |
|
| 1185 |
+ if ((edgesTouched & mTrackingEdges) != 0) {
|
|
| 1186 |
+ mCallback.onEdgeTouched(edgesTouched & mTrackingEdges, pointerId); |
|
| 1187 |
+ } |
|
| 1188 |
+ break; |
|
| 1189 |
+ } |
|
| 1190 |
+ |
|
| 1191 |
+ case MotionEventCompat.ACTION_POINTER_DOWN: {
|
|
| 1192 |
+ final int pointerId = MotionEventCompat.getPointerId(ev, actionIndex); |
|
| 1193 |
+ final float x = MotionEventCompat.getX(ev, actionIndex); |
|
| 1194 |
+ final float y = MotionEventCompat.getY(ev, actionIndex); |
|
| 1195 |
+ |
|
| 1196 |
+ saveInitialMotion(x, y, pointerId); |
|
| 1197 |
+ |
|
| 1198 |
+ // A ViewDragHelper can only manipulate one view at a time. |
|
| 1199 |
+ if (mDragState == STATE_IDLE) {
|
|
| 1200 |
+ // If we're idle we can do anything! Treat it like a normal |
|
| 1201 |
+ // down event. |
|
| 1202 |
+ |
|
| 1203 |
+ final View toCapture = findTopChildUnder((int) x, (int) y); |
|
| 1204 |
+ tryCaptureViewForDrag(toCapture, pointerId); |
|
| 1205 |
+ |
|
| 1206 |
+ final int edgesTouched = mInitialEdgeTouched[pointerId]; |
|
| 1207 |
+ if ((edgesTouched & mTrackingEdges) != 0) {
|
|
| 1208 |
+ mCallback.onEdgeTouched(edgesTouched & mTrackingEdges, pointerId); |
|
| 1209 |
+ } |
|
| 1210 |
+ } else if (isCapturedViewUnder((int) x, (int) y)) {
|
|
| 1211 |
+ // We're still tracking a captured view. If the same view is |
|
| 1212 |
+ // under this |
|
| 1213 |
+ // point, we'll swap to controlling it with this pointer |
|
| 1214 |
+ // instead. |
|
| 1215 |
+ // (This will still work if we're "catching" a settling |
|
| 1216 |
+ // view.) |
|
| 1217 |
+ |
|
| 1218 |
+ tryCaptureViewForDrag(mCapturedView, pointerId); |
|
| 1219 |
+ } |
|
| 1220 |
+ break; |
|
| 1221 |
+ } |
|
| 1222 |
+ |
|
| 1223 |
+ case MotionEvent.ACTION_MOVE: {
|
|
| 1224 |
+ if (mDragState == STATE_DRAGGING) {
|
|
| 1225 |
+ final int index = MotionEventCompat.findPointerIndex(ev, mActivePointerId); |
|
| 1226 |
+ final float x = MotionEventCompat.getX(ev, index); |
|
| 1227 |
+ final float y = MotionEventCompat.getY(ev, index); |
|
| 1228 |
+ final int idx = (int) (x - mLastMotionX[mActivePointerId]); |
|
| 1229 |
+ final int idy = (int) (y - mLastMotionY[mActivePointerId]); |
|
| 1230 |
+ |
|
| 1231 |
+ dragTo(mCapturedView.getLeft() + idx, mCapturedView.getTop() + idy, idx, idy); |
|
| 1232 |
+ |
|
| 1233 |
+ saveLastMotion(ev); |
|
| 1234 |
+ } else {
|
|
| 1235 |
+ // Check to see if any pointer is now over a draggable view. |
|
| 1236 |
+ final int pointerCount = MotionEventCompat.getPointerCount(ev); |
|
| 1237 |
+ for (int i = 0; i < pointerCount; i++) {
|
|
| 1238 |
+ final int pointerId = MotionEventCompat.getPointerId(ev, i); |
|
| 1239 |
+ final float x = MotionEventCompat.getX(ev, i); |
|
| 1240 |
+ final float y = MotionEventCompat.getY(ev, i); |
|
| 1241 |
+ final float dx = x - mInitialMotionX[pointerId]; |
|
| 1242 |
+ final float dy = y - mInitialMotionY[pointerId]; |
|
| 1243 |
+ |
|
| 1244 |
+ reportNewEdgeDrags(dx, dy, pointerId); |
|
| 1245 |
+ if (mDragState == STATE_DRAGGING) {
|
|
| 1246 |
+ // Callback might have started an edge drag. |
|
| 1247 |
+ break; |
|
| 1248 |
+ } |
|
| 1249 |
+ |
|
| 1250 |
+ final View toCapture = findTopChildUnder((int) x, (int) y); |
|
| 1251 |
+ if (checkTouchSlop(toCapture, dx, dy) |
|
| 1252 |
+ && tryCaptureViewForDrag(toCapture, pointerId)) {
|
|
| 1253 |
+ break; |
|
| 1254 |
+ } |
|
| 1255 |
+ } |
|
| 1256 |
+ saveLastMotion(ev); |
|
| 1257 |
+ } |
|
| 1258 |
+ break; |
|
| 1259 |
+ } |
|
| 1260 |
+ |
|
| 1261 |
+ case MotionEventCompat.ACTION_POINTER_UP: {
|
|
| 1262 |
+ final int pointerId = MotionEventCompat.getPointerId(ev, actionIndex); |
|
| 1263 |
+ if (mDragState == STATE_DRAGGING && pointerId == mActivePointerId) {
|
|
| 1264 |
+ // Try to find another pointer that's still holding on to |
|
| 1265 |
+ // the captured view. |
|
| 1266 |
+ int newActivePointer = INVALID_POINTER; |
|
| 1267 |
+ final int pointerCount = MotionEventCompat.getPointerCount(ev); |
|
| 1268 |
+ for (int i = 0; i < pointerCount; i++) {
|
|
| 1269 |
+ final int id = MotionEventCompat.getPointerId(ev, i); |
|
| 1270 |
+ if (id == mActivePointerId) {
|
|
| 1271 |
+ // This one's going away, skip. |
|
| 1272 |
+ continue; |
|
| 1273 |
+ } |
|
| 1274 |
+ |
|
| 1275 |
+ final float x = MotionEventCompat.getX(ev, i); |
|
| 1276 |
+ final float y = MotionEventCompat.getY(ev, i); |
|
| 1277 |
+ if (findTopChildUnder((int) x, (int) y) == mCapturedView |
|
| 1278 |
+ && tryCaptureViewForDrag(mCapturedView, id)) {
|
|
| 1279 |
+ newActivePointer = mActivePointerId; |
|
| 1280 |
+ break; |
|
| 1281 |
+ } |
|
| 1282 |
+ } |
|
| 1283 |
+ |
|
| 1284 |
+ if (newActivePointer == INVALID_POINTER) {
|
|
| 1285 |
+ // We didn't find another pointer still touching the |
|
| 1286 |
+ // view, release it. |
|
| 1287 |
+ releaseViewForPointerUp(); |
|
| 1288 |
+ } |
|
| 1289 |
+ } |
|
| 1290 |
+ clearMotionHistory(pointerId); |
|
| 1291 |
+ break; |
|
| 1292 |
+ } |
|
| 1293 |
+ |
|
| 1294 |
+ case MotionEvent.ACTION_UP: {
|
|
| 1295 |
+ if (mDragState == STATE_DRAGGING) {
|
|
| 1296 |
+ releaseViewForPointerUp(); |
|
| 1297 |
+ } |
|
| 1298 |
+ cancel(); |
|
| 1299 |
+ break; |
|
| 1300 |
+ } |
|
| 1301 |
+ |
|
| 1302 |
+ case MotionEvent.ACTION_CANCEL: {
|
|
| 1303 |
+ if (mDragState == STATE_DRAGGING) {
|
|
| 1304 |
+ dispatchViewReleased(0, 0); |
|
| 1305 |
+ } |
|
| 1306 |
+ cancel(); |
|
| 1307 |
+ break; |
|
| 1308 |
+ } |
|
| 1309 |
+ } |
|
| 1310 |
+ } |
|
| 1311 |
+ |
|
| 1312 |
+ private void reportNewEdgeDrags(float dx, float dy, int pointerId) {
|
|
| 1313 |
+ int dragsStarted = 0; |
|
| 1314 |
+ if (checkNewEdgeDrag(dx, dy, pointerId, EDGE_LEFT)) {
|
|
| 1315 |
+ dragsStarted |= EDGE_LEFT; |
|
| 1316 |
+ } |
|
| 1317 |
+ if (checkNewEdgeDrag(dy, dx, pointerId, EDGE_TOP)) {
|
|
| 1318 |
+ dragsStarted |= EDGE_TOP; |
|
| 1319 |
+ } |
|
| 1320 |
+ if (checkNewEdgeDrag(dx, dy, pointerId, EDGE_RIGHT)) {
|
|
| 1321 |
+ dragsStarted |= EDGE_RIGHT; |
|
| 1322 |
+ } |
|
| 1323 |
+ if (checkNewEdgeDrag(dy, dx, pointerId, EDGE_BOTTOM)) {
|
|
| 1324 |
+ dragsStarted |= EDGE_BOTTOM; |
|
| 1325 |
+ } |
|
| 1326 |
+ |
|
| 1327 |
+ if (dragsStarted != 0) {
|
|
| 1328 |
+ mEdgeDragsInProgress[pointerId] |= dragsStarted; |
|
| 1329 |
+ mCallback.onEdgeDragStarted(dragsStarted, pointerId); |
|
| 1330 |
+ } |
|
| 1331 |
+ } |
|
| 1332 |
+ |
|
| 1333 |
+ private boolean checkNewEdgeDrag(float delta, float odelta, int pointerId, int edge) {
|
|
| 1334 |
+ final float absDelta = Math.abs(delta); |
|
| 1335 |
+ final float absODelta = Math.abs(odelta); |
|
| 1336 |
+ |
|
| 1337 |
+ if ((mInitialEdgeTouched[pointerId] & edge) != edge || (mTrackingEdges & edge) == 0 |
|
| 1338 |
+ || (mEdgeDragsLocked[pointerId] & edge) == edge |
|
| 1339 |
+ || (mEdgeDragsInProgress[pointerId] & edge) == edge |
|
| 1340 |
+ || (absDelta <= mTouchSlop && absODelta <= mTouchSlop)) {
|
|
| 1341 |
+ return false; |
|
| 1342 |
+ } |
|
| 1343 |
+ if (absDelta < absODelta * 0.5f && mCallback.onEdgeLock(edge)) {
|
|
| 1344 |
+ mEdgeDragsLocked[pointerId] |= edge; |
|
| 1345 |
+ return false; |
|
| 1346 |
+ } |
|
| 1347 |
+ return (mEdgeDragsInProgress[pointerId] & edge) == 0 && absDelta > mTouchSlop; |
|
| 1348 |
+ } |
|
| 1349 |
+ |
|
| 1350 |
+ /** |
|
| 1351 |
+ * Check if we've crossed a reasonable touch slop for the given child view. |
|
| 1352 |
+ * If the child cannot be dragged along the horizontal or vertical axis, |
|
| 1353 |
+ * motion along that axis will not count toward the slop check. |
|
| 1354 |
+ * |
|
| 1355 |
+ * @param child Child to check |
|
| 1356 |
+ * @param dx Motion since initial position along X axis |
|
| 1357 |
+ * @param dy Motion since initial position along Y axis |
|
| 1358 |
+ * @return true if the touch slop has been crossed |
|
| 1359 |
+ */ |
|
| 1360 |
+ private boolean checkTouchSlop(View child, float dx, float dy) {
|
|
| 1361 |
+ if (child == null) {
|
|
| 1362 |
+ return false; |
|
| 1363 |
+ } |
|
| 1364 |
+ final boolean checkHorizontal = mCallback.getViewHorizontalDragRange(child) > 0; |
|
| 1365 |
+ final boolean checkVertical = mCallback.getViewVerticalDragRange(child) > 0; |
|
| 1366 |
+ |
|
| 1367 |
+ if (checkHorizontal && checkVertical) {
|
|
| 1368 |
+ return dx * dx + dy * dy > mTouchSlop * mTouchSlop; |
|
| 1369 |
+ } else if (checkHorizontal) {
|
|
| 1370 |
+ return Math.abs(dx) > mTouchSlop; |
|
| 1371 |
+ } else if (checkVertical) {
|
|
| 1372 |
+ return Math.abs(dy) > mTouchSlop; |
|
| 1373 |
+ } |
|
| 1374 |
+ return false; |
|
| 1375 |
+ } |
|
| 1376 |
+ |
|
| 1377 |
+ /** |
|
| 1378 |
+ * Check if any pointer tracked in the current gesture has crossed the |
|
| 1379 |
+ * required slop threshold. |
|
| 1380 |
+ * <p> |
|
| 1381 |
+ * This depends on internal state populated by |
|
| 1382 |
+ * {@link #shouldInterceptTouchEvent(MotionEvent)} or
|
|
| 1383 |
+ * {@link #processTouchEvent(MotionEvent)}. You should only
|
|
| 1384 |
+ * rely on the results of this method after all currently available touch |
|
| 1385 |
+ * data has been provided to one of these two methods. |
|
| 1386 |
+ * </p> |
|
| 1387 |
+ * |
|
| 1388 |
+ * @param directions Combination of direction flags, see |
|
| 1389 |
+ * {@link #DIRECTION_HORIZONTAL}, {@link #DIRECTION_VERTICAL},
|
|
| 1390 |
+ * {@link #DIRECTION_ALL}
|
|
| 1391 |
+ * @return true if the slop threshold has been crossed, false otherwise |
|
| 1392 |
+ */ |
|
| 1393 |
+ public boolean checkTouchSlop(int directions) {
|
|
| 1394 |
+ final int count = mInitialMotionX.length; |
|
| 1395 |
+ for (int i = 0; i < count; i++) {
|
|
| 1396 |
+ if (checkTouchSlop(directions, i)) {
|
|
| 1397 |
+ return true; |
|
| 1398 |
+ } |
|
| 1399 |
+ } |
|
| 1400 |
+ return false; |
|
| 1401 |
+ } |
|
| 1402 |
+ |
|
| 1403 |
+ /** |
|
| 1404 |
+ * Check if the specified pointer tracked in the current gesture has crossed |
|
| 1405 |
+ * the required slop threshold. |
|
| 1406 |
+ * <p> |
|
| 1407 |
+ * This depends on internal state populated by |
|
| 1408 |
+ * {@link #shouldInterceptTouchEvent(MotionEvent)} or
|
|
| 1409 |
+ * {@link #processTouchEvent(MotionEvent)}. You should only
|
|
| 1410 |
+ * rely on the results of this method after all currently available touch |
|
| 1411 |
+ * data has been provided to one of these two methods. |
|
| 1412 |
+ * </p> |
|
| 1413 |
+ * |
|
| 1414 |
+ * @param directions Combination of direction flags, see |
|
| 1415 |
+ * {@link #DIRECTION_HORIZONTAL}, {@link #DIRECTION_VERTICAL},
|
|
| 1416 |
+ * {@link #DIRECTION_ALL}
|
|
| 1417 |
+ * @param pointerId ID of the pointer to slop check as specified by |
|
| 1418 |
+ * MotionEvent |
|
| 1419 |
+ * @return true if the slop threshold has been crossed, false otherwise |
|
| 1420 |
+ */ |
|
| 1421 |
+ public boolean checkTouchSlop(int directions, int pointerId) {
|
|
| 1422 |
+ if (!isPointerDown(pointerId)) {
|
|
| 1423 |
+ return false; |
|
| 1424 |
+ } |
|
| 1425 |
+ |
|
| 1426 |
+ final boolean checkHorizontal = (directions & DIRECTION_HORIZONTAL) == DIRECTION_HORIZONTAL; |
|
| 1427 |
+ final boolean checkVertical = (directions & DIRECTION_VERTICAL) == DIRECTION_VERTICAL; |
|
| 1428 |
+ |
|
| 1429 |
+ final float dx = mLastMotionX[pointerId] - mInitialMotionX[pointerId]; |
|
| 1430 |
+ final float dy = mLastMotionY[pointerId] - mInitialMotionY[pointerId]; |
|
| 1431 |
+ |
|
| 1432 |
+ if (checkHorizontal && checkVertical) {
|
|
| 1433 |
+ return dx * dx + dy * dy > mTouchSlop * mTouchSlop; |
|
| 1434 |
+ } else if (checkHorizontal) {
|
|
| 1435 |
+ return Math.abs(dx) > mTouchSlop; |
|
| 1436 |
+ } else if (checkVertical) {
|
|
| 1437 |
+ return Math.abs(dy) > mTouchSlop; |
|
| 1438 |
+ } |
|
| 1439 |
+ return false; |
|
| 1440 |
+ } |
|
| 1441 |
+ |
|
| 1442 |
+ /** |
|
| 1443 |
+ * Check if any of the edges specified were initially touched in the |
|
| 1444 |
+ * currently active gesture. If there is no currently active gesture this |
|
| 1445 |
+ * method will return false. |
|
| 1446 |
+ * |
|
| 1447 |
+ * @param edges Edges to check for an initial edge touch. See |
|
| 1448 |
+ * {@link #EDGE_LEFT}, {@link #EDGE_TOP}, {@link #EDGE_RIGHT},
|
|
| 1449 |
+ * {@link #EDGE_BOTTOM} and {@link #EDGE_ALL}
|
|
| 1450 |
+ * @return true if any of the edges specified were initially touched in the |
|
| 1451 |
+ * current gesture |
|
| 1452 |
+ */ |
|
| 1453 |
+ public boolean isEdgeTouched(int edges) {
|
|
| 1454 |
+ final int count = mInitialEdgeTouched.length; |
|
| 1455 |
+ for (int i = 0; i < count; i++) {
|
|
| 1456 |
+ if (isEdgeTouched(edges, i)) {
|
|
| 1457 |
+ return true; |
|
| 1458 |
+ } |
|
| 1459 |
+ } |
|
| 1460 |
+ return false; |
|
| 1461 |
+ } |
|
| 1462 |
+ |
|
| 1463 |
+ /** |
|
| 1464 |
+ * Check if any of the edges specified were initially touched by the pointer |
|
| 1465 |
+ * with the specified ID. If there is no currently active gesture or if |
|
| 1466 |
+ * there is no pointer with the given ID currently down this method will |
|
| 1467 |
+ * return false. |
|
| 1468 |
+ * |
|
| 1469 |
+ * @param edges Edges to check for an initial edge touch. See |
|
| 1470 |
+ * {@link #EDGE_LEFT}, {@link #EDGE_TOP}, {@link #EDGE_RIGHT},
|
|
| 1471 |
+ * {@link #EDGE_BOTTOM} and {@link #EDGE_ALL}
|
|
| 1472 |
+ * @return true if any of the edges specified were initially touched in the |
|
| 1473 |
+ * current gesture |
|
| 1474 |
+ */ |
|
| 1475 |
+ public boolean isEdgeTouched(int edges, int pointerId) {
|
|
| 1476 |
+ return isPointerDown(pointerId) && (mInitialEdgeTouched[pointerId] & edges) != 0; |
|
| 1477 |
+ } |
|
| 1478 |
+ |
|
| 1479 |
+ private void releaseViewForPointerUp() {
|
|
| 1480 |
+ mVelocityTracker.computeCurrentVelocity(1000, mMaxVelocity); |
|
| 1481 |
+ final float xvel = clampMag( |
|
| 1482 |
+ VelocityTrackerCompat.getXVelocity(mVelocityTracker, mActivePointerId), |
|
| 1483 |
+ mMinVelocity, mMaxVelocity); |
|
| 1484 |
+ final float yvel = clampMag( |
|
| 1485 |
+ VelocityTrackerCompat.getYVelocity(mVelocityTracker, mActivePointerId), |
|
| 1486 |
+ mMinVelocity, mMaxVelocity); |
|
| 1487 |
+ dispatchViewReleased(xvel, yvel); |
|
| 1488 |
+ } |
|
| 1489 |
+ |
|
| 1490 |
+ private void dragTo(int left, int top, int dx, int dy) {
|
|
| 1491 |
+ int clampedX = left; |
|
| 1492 |
+ int clampedY = top; |
|
| 1493 |
+ final int oldLeft = mCapturedView.getLeft(); |
|
| 1494 |
+ final int oldTop = mCapturedView.getTop(); |
|
| 1495 |
+ if (dx != 0) {
|
|
| 1496 |
+ clampedX = mCallback.clampViewPositionHorizontal(mCapturedView, left, dx); |
|
| 1497 |
+ mCapturedView.offsetLeftAndRight(clampedX - oldLeft); |
|
| 1498 |
+ } |
|
| 1499 |
+ if (dy != 0) {
|
|
| 1500 |
+ clampedY = mCallback.clampViewPositionVertical(mCapturedView, top, dy); |
|
| 1501 |
+ mCapturedView.offsetTopAndBottom(clampedY - oldTop); |
|
| 1502 |
+ } |
|
| 1503 |
+ |
|
| 1504 |
+ if (dx != 0 || dy != 0) {
|
|
| 1505 |
+ final int clampedDx = clampedX - oldLeft; |
|
| 1506 |
+ final int clampedDy = clampedY - oldTop; |
|
| 1507 |
+ mCallback |
|
| 1508 |
+ .onViewPositionChanged(mCapturedView, clampedX, clampedY, clampedDx, clampedDy); |
|
| 1509 |
+ } |
|
| 1510 |
+ } |
|
| 1511 |
+ |
|
| 1512 |
+ /** |
|
| 1513 |
+ * Determine if the currently captured view is under the given point in the |
|
| 1514 |
+ * parent view's coordinate system. If there is no captured view this method |
|
| 1515 |
+ * will return false. |
|
| 1516 |
+ * |
|
| 1517 |
+ * @param x X position to test in the parent's coordinate system |
|
| 1518 |
+ * @param y Y position to test in the parent's coordinate system |
|
| 1519 |
+ * @return true if the captured view is under the given point, false |
|
| 1520 |
+ * otherwise |
|
| 1521 |
+ */ |
|
| 1522 |
+ public boolean isCapturedViewUnder(int x, int y) {
|
|
| 1523 |
+ return isViewUnder(mCapturedView, x, y); |
|
| 1524 |
+ } |
|
| 1525 |
+ |
|
| 1526 |
+ /** |
|
| 1527 |
+ * Determine if the supplied view is under the given point in the parent |
|
| 1528 |
+ * view's coordinate system. |
|
| 1529 |
+ * |
|
| 1530 |
+ * @param view Child view of the parent to hit test |
|
| 1531 |
+ * @param x X position to test in the parent's coordinate system |
|
| 1532 |
+ * @param y Y position to test in the parent's coordinate system |
|
| 1533 |
+ * @return true if the supplied view is under the given point, false |
|
| 1534 |
+ * otherwise |
|
| 1535 |
+ */ |
|
| 1536 |
+ public boolean isViewUnder(View view, int x, int y) {
|
|
| 1537 |
+ if (view == null) {
|
|
| 1538 |
+ return false; |
|
| 1539 |
+ } |
|
| 1540 |
+ return x >= view.getLeft() && x < view.getRight() && y >= view.getTop() |
|
| 1541 |
+ && y < view.getBottom(); |
|
| 1542 |
+ } |
|
| 1543 |
+ |
|
| 1544 |
+ /** |
|
| 1545 |
+ * Find the topmost child under the given point within the parent view's |
|
| 1546 |
+ * coordinate system. The child order is determined using |
|
| 1547 |
+ * {@link me.imid.swipebacklayout.lib.ViewDragHelper.Callback#getOrderedChildIndex(int)}
|
|
| 1548 |
+ * . |
|
| 1549 |
+ * |
|
| 1550 |
+ * @param x X position to test in the parent's coordinate system |
|
| 1551 |
+ * @param y Y position to test in the parent's coordinate system |
|
| 1552 |
+ * @return The topmost child view under (x, y) or null if none found. |
|
| 1553 |
+ */ |
|
| 1554 |
+ public View findTopChildUnder(int x, int y) {
|
|
| 1555 |
+ final int childCount = mParentView.getChildCount(); |
|
| 1556 |
+ for (int i = childCount - 1; i >= 0; i--) {
|
|
| 1557 |
+ final View child = mParentView.getChildAt(mCallback.getOrderedChildIndex(i)); |
|
| 1558 |
+ if (x >= child.getLeft() && x < child.getRight() && y >= child.getTop() |
|
| 1559 |
+ && y < child.getBottom()) {
|
|
| 1560 |
+ return child; |
|
| 1561 |
+ } |
|
| 1562 |
+ } |
|
| 1563 |
+ return null; |
|
| 1564 |
+ } |
|
| 1565 |
+ |
|
| 1566 |
+ private int getEdgeTouched(int x, int y) {
|
|
| 1567 |
+ int result = 0; |
|
| 1568 |
+ |
|
| 1569 |
+ if (x < mParentView.getLeft() + mEdgeSize) |
|
| 1570 |
+ result = EDGE_LEFT; |
|
| 1571 |
+ if (y < mParentView.getTop() + mEdgeSize) |
|
| 1572 |
+ result = EDGE_TOP; |
|
| 1573 |
+ if (x > mParentView.getRight() - mEdgeSize) |
|
| 1574 |
+ result = EDGE_RIGHT; |
|
| 1575 |
+ if (y > mParentView.getBottom() - mEdgeSize) |
|
| 1576 |
+ result = EDGE_BOTTOM; |
|
| 1577 |
+ |
|
| 1578 |
+ return result; |
|
| 1579 |
+ } |
|
| 1580 |
+} |
@@ -0,0 +1,6 @@ |
||
| 1 |
+<?xml version="1.0" encoding="utf-8"?> |
|
| 2 |
+<com.android.views.swipebacklayout.SwipeBackLayout xmlns:android="http://schemas.android.com/apk/res/android" |
|
| 3 |
+ android:id="@+id/swipe" |
|
| 4 |
+ android:layout_width="match_parent" |
|
| 5 |
+ android:layout_height="match_parent" /> |
|
| 6 |
+ |
@@ -73,4 +73,18 @@ |
||
| 73 | 73 |
</attr> |
| 74 | 74 |
</declare-styleable> |
| 75 | 75 |
|
| 76 |
+ <declare-styleable name="SwipeBackLayout"> |
|
| 77 |
+ <attr name="edge_size" format="dimension"/> |
|
| 78 |
+ <attr name="edge_flag"> |
|
| 79 |
+ <enum name="left" value="0" /> |
|
| 80 |
+ <enum name="right" value="1" /> |
|
| 81 |
+ <enum name="bottom" value="2" /> |
|
| 82 |
+ <enum name="all" value="3" /> |
|
| 83 |
+ </attr> |
|
| 84 |
+ <attr name="shadow_left" format="reference"/> |
|
| 85 |
+ <attr name="shadow_right" format="reference"/> |
|
| 86 |
+ <attr name="shadow_bottom" format="reference"/> |
|
| 87 |
+ </declare-styleable> |
|
| 88 |
+ |
|
| 89 |
+ <attr name="SwipeBackLayoutStyle" format="reference"/> |
|
| 76 | 90 |
</resources> |
@@ -6,21 +6,12 @@ |
||
| 6 | 6 |
<item name="android:background">@color/line_bg</item> |
| 7 | 7 |
<item name="android:layout_margin">2dp</item> |
| 8 | 8 |
</style> |
| 9 |
- <declare-styleable name="SwipeLayout"> |
|
| 10 |
- <attr name="drag_edge"> |
|
| 11 |
- <flag name="left" value="1" /> |
|
| 12 |
- <flag name="right" value="2" /> |
|
| 13 |
- <flag name="top" value="4" /> |
|
| 14 |
- <flag name="bottom" value="8" /> |
|
| 15 |
- </attr> |
|
| 16 |
- <attr name="leftEdgeSwipeOffset" format="dimension" /> |
|
| 17 |
- <attr name="rightEdgeSwipeOffset" format="dimension" /> |
|
| 18 |
- <attr name="topEdgeSwipeOffset" format="dimension" /> |
|
| 19 |
- <attr name="bottomEdgeSwipeOffset" format="dimension" /> |
|
| 20 |
- <attr name="show_mode" format="enum"> |
|
| 21 |
- <enum name="lay_down" value="0" /> |
|
| 22 |
- <enum name="pull_out" value="1" /> |
|
| 23 |
- </attr> |
|
| 24 |
- <attr name="clickToClose" format="boolean" /> |
|
| 25 |
- </declare-styleable> |
|
| 9 |
+ |
|
| 10 |
+ <style name="SwipeBackLayout"> |
|
| 11 |
+ <item name="edge_size">50dip</item> |
|
| 12 |
+ <item name="shadow_left">@drawable/shadow_left</item> |
|
| 13 |
+ <item name="shadow_right">@drawable/shadow_right</item> |
|
| 14 |
+ <item name="shadow_bottom">@drawable/shadow_bottom</item> |
|
| 15 |
+ </style> |
|
| 16 |
+ |
|
| 26 | 17 |
</resources> |
