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@ -16,10 +16,6 @@ |
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package org.floens.chan.ui; |
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import java.util.ArrayList; |
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import java.util.Collections; |
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import java.util.List; |
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import android.animation.Animator; |
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import android.animation.AnimatorListenerAdapter; |
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import android.animation.ValueAnimator; |
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@ -32,13 +28,17 @@ import android.view.ViewGroup; |
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import android.widget.AbsListView; |
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import android.widget.ListView; |
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import java.util.ArrayList; |
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import java.util.Collections; |
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import java.util.List; |
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/** |
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* A {@link android.view.View.OnTouchListener} that makes the list items in a |
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* {@link ListView} dismissable. {@link ListView} is given special treatment |
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* because by default it handles touches for its list items... i.e. it's in |
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* charge of drawing the pressed state (the list selector), handling list item |
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* clicks, etc. |
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* |
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* |
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* <p> |
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* After creating the listener, the caller should also call |
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* {@link ListView#setOnScrollListener(android.widget.AbsListView.OnScrollListener)} |
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@ -48,11 +48,11 @@ import android.widget.ListView; |
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* {@link SwipeDismissListViewTouchListener} is paused during list view |
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* scrolling. |
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* </p> |
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* |
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* |
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* <p> |
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* Example usage: |
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* </p> |
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* |
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* |
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* <pre> |
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* SwipeDismissListViewTouchListener touchListener = new SwipeDismissListViewTouchListener(listView, |
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* new SwipeDismissListViewTouchListener.OnDismissCallback() { |
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@ -66,7 +66,7 @@ import android.widget.ListView; |
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* listView.setOnTouchListener(touchListener); |
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* listView.setOnScrollListener(touchListener.makeScrollListener()); |
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* </pre> |
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* |
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* |
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* <p> |
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* This class Requires API level 12 or later due to use of |
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* {@link android.view.ViewPropertyAnimator}. |
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@ -108,24 +108,20 @@ public class SwipeDismissListViewTouchListener implements View.OnTouchListener { |
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/** |
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* Called when the user has indicated they she would like to dismiss one |
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* or more list item positions. |
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* |
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* @param listView |
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* The originating {@link ListView}. |
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* @param reverseSortedPositions |
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* An array of positions to dismiss, sorted in descending |
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* order for convenience. |
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* |
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* @param listView The originating {@link ListView}. |
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* @param reverseSortedPositions An array of positions to dismiss, sorted in descending |
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* order for convenience. |
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*/ |
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void onDismiss(ListView listView, int[] reverseSortedPositions); |
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} |
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/** |
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* Constructs a new swipe-to-dismiss touch listener for the given list view. |
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* |
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* @param listView |
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* The list view whose items should be dismissable. |
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* @param callbacks |
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* The callback to trigger when the user has indicated that she |
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* would like to dismiss one or more list items. |
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* |
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* @param listView The list view whose items should be dismissable. |
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* @param callbacks The callback to trigger when the user has indicated that she |
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* would like to dismiss one or more list items. |
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*/ |
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public SwipeDismissListViewTouchListener(ListView listView, DismissCallbacks callbacks) { |
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ViewConfiguration vc = ViewConfiguration.get(listView.getContext()); |
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@ -136,11 +132,11 @@ public class SwipeDismissListViewTouchListener implements View.OnTouchListener { |
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mListView = listView; |
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mCallbacks = callbacks; |
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} |
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public int getSlop() { |
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return mSlop; |
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} |
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public void setSlop(int slop) { |
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mSlop = slop; |
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} |
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@ -148,9 +144,8 @@ public class SwipeDismissListViewTouchListener implements View.OnTouchListener { |
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/** |
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* Enables or disables (pauses or resumes) watching for swipe-to-dismiss |
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* gestures. |
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* |
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* @param enabled |
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* Whether or not to watch for gestures. |
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* |
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* @param enabled Whether or not to watch for gestures. |
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*/ |
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public void setEnabled(boolean enabled) { |
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mPaused = !enabled; |
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@ -164,7 +159,7 @@ public class SwipeDismissListViewTouchListener implements View.OnTouchListener { |
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* scroll changes through to this listener. This will ensure that this |
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* {@link SwipeDismissListViewTouchListener} is paused during list view |
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* scrolling.</p> |
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* |
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* |
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* @see SwipeDismissListViewTouchListener |
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*/ |
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public AbsListView.OnScrollListener makeScrollListener() { |
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@ -195,126 +190,126 @@ public class SwipeDismissListViewTouchListener implements View.OnTouchListener { |
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} |
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switch (motionEvent.getActionMasked()) { |
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case MotionEvent.ACTION_DOWN: { |
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if (mPaused) { |
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return false; |
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case MotionEvent.ACTION_DOWN: { |
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if (mPaused) { |
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return false; |
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} |
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// TODO: ensure this is a finger, and set a flag
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// Find the child view that was touched (perform a hit test)
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Rect rect = new Rect(); |
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int childCount = mListView.getChildCount(); |
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int[] listViewCoords = new int[2]; |
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mListView.getLocationOnScreen(listViewCoords); |
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int x = (int) motionEvent.getRawX() - listViewCoords[0]; |
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int y = (int) motionEvent.getRawY() - listViewCoords[1]; |
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View child; |
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for (int i = 0; i < childCount; i++) { |
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child = mListView.getChildAt(i); |
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child.getHitRect(rect); |
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if (rect.contains(x, y)) { |
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mDownView = child; |
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break; |
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} |
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} |
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if (mDownView != null) { |
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mDownX = motionEvent.getRawX(); |
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mDownPosition = mListView.getPositionForView(mDownView); |
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if (mCallbacks.canDismiss(mDownPosition)) { |
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mVelocityTracker = VelocityTracker.obtain(); |
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mVelocityTracker.addMovement(motionEvent); |
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} else { |
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mDownView = null; |
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} |
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} |
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view.onTouchEvent(motionEvent); |
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return true; |
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} |
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// TODO: ensure this is a finger, and set a flag
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// Find the child view that was touched (perform a hit test)
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Rect rect = new Rect(); |
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int childCount = mListView.getChildCount(); |
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int[] listViewCoords = new int[2]; |
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mListView.getLocationOnScreen(listViewCoords); |
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int x = (int) motionEvent.getRawX() - listViewCoords[0]; |
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int y = (int) motionEvent.getRawY() - listViewCoords[1]; |
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View child; |
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for (int i = 0; i < childCount; i++) { |
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child = mListView.getChildAt(i); |
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child.getHitRect(rect); |
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if (rect.contains(x, y)) { |
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mDownView = child; |
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case MotionEvent.ACTION_UP: { |
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if (mVelocityTracker == null) { |
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break; |
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} |
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} |
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if (mDownView != null) { |
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mDownX = motionEvent.getRawX(); |
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mDownPosition = mListView.getPositionForView(mDownView); |
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if (mCallbacks.canDismiss(mDownPosition)) { |
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mVelocityTracker = VelocityTracker.obtain(); |
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mVelocityTracker.addMovement(motionEvent); |
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float deltaX = motionEvent.getRawX() - mDownX; |
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mVelocityTracker.addMovement(motionEvent); |
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mVelocityTracker.computeCurrentVelocity(1000); |
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float velocityX = mVelocityTracker.getXVelocity(); |
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float absVelocityX = Math.abs(velocityX); |
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float absVelocityY = Math.abs(mVelocityTracker.getYVelocity()); |
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boolean dismiss = false; |
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boolean dismissRight = false; |
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if (Math.abs(deltaX) > mViewWidth / 2) { |
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dismiss = true; |
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dismissRight = deltaX > 0; |
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} else if (mMinFlingVelocity <= absVelocityX && absVelocityX <= mMaxFlingVelocity |
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&& absVelocityY < absVelocityX) { |
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// dismiss only if flinging in the same direction as dragging
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dismiss = (velocityX < 0) == (deltaX < 0); |
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dismissRight = mVelocityTracker.getXVelocity() > 0; |
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} |
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if (dismiss) { |
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// dismiss
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dismiss(mDownView, mDownPosition, dismissRight); |
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} else { |
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mDownView = null; |
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// cancel
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mDownView.animate().translationX(0).alpha(1).setDuration(mAnimationTime).setListener(null); |
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} |
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} |
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view.onTouchEvent(motionEvent); |
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return true; |
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} |
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case MotionEvent.ACTION_UP: { |
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if (mVelocityTracker == null) { |
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mVelocityTracker.recycle(); |
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mVelocityTracker = null; |
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mDownX = 0; |
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mDownView = null; |
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mDownPosition = ListView.INVALID_POSITION; |
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mSwiping = false; |
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break; |
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} |
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float deltaX = motionEvent.getRawX() - mDownX; |
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mVelocityTracker.addMovement(motionEvent); |
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mVelocityTracker.computeCurrentVelocity(1000); |
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float velocityX = mVelocityTracker.getXVelocity(); |
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float absVelocityX = Math.abs(velocityX); |
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float absVelocityY = Math.abs(mVelocityTracker.getYVelocity()); |
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boolean dismiss = false; |
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boolean dismissRight = false; |
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if (Math.abs(deltaX) > mViewWidth / 2) { |
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dismiss = true; |
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dismissRight = deltaX > 0; |
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} else if (mMinFlingVelocity <= absVelocityX && absVelocityX <= mMaxFlingVelocity |
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&& absVelocityY < absVelocityX) { |
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// dismiss only if flinging in the same direction as dragging
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dismiss = (velocityX < 0) == (deltaX < 0); |
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dismissRight = mVelocityTracker.getXVelocity() > 0; |
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} |
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if (dismiss) { |
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// dismiss
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dismiss(mDownView, mDownPosition, dismissRight); |
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} else { |
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// cancel
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mDownView.animate().translationX(0).alpha(1).setDuration(mAnimationTime).setListener(null); |
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} |
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mVelocityTracker.recycle(); |
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mVelocityTracker = null; |
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mDownX = 0; |
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mDownView = null; |
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mDownPosition = ListView.INVALID_POSITION; |
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mSwiping = false; |
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break; |
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} |
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case MotionEvent.ACTION_CANCEL: { |
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if (mVelocityTracker == null) { |
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break; |
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} |
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case MotionEvent.ACTION_CANCEL: { |
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if (mVelocityTracker == null) { |
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if (mDownView != null) { |
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// cancel
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mDownView.animate().translationX(0).alpha(1).setDuration(mAnimationTime).setListener(null); |
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} |
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mVelocityTracker.recycle(); |
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mVelocityTracker = null; |
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mDownX = 0; |
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mDownView = null; |
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mDownPosition = ListView.INVALID_POSITION; |
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mSwiping = false; |
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break; |
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} |
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if (mDownView != null) { |
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// cancel
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mDownView.animate().translationX(0).alpha(1).setDuration(mAnimationTime).setListener(null); |
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} |
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mVelocityTracker.recycle(); |
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mVelocityTracker = null; |
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mDownX = 0; |
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mDownView = null; |
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mDownPosition = ListView.INVALID_POSITION; |
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mSwiping = false; |
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break; |
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} |
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case MotionEvent.ACTION_MOVE: { |
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if (mVelocityTracker == null || mPaused) { |
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break; |
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} |
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case MotionEvent.ACTION_MOVE: { |
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if (mVelocityTracker == null || mPaused) { |
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break; |
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} |
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mVelocityTracker.addMovement(motionEvent); |
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float deltaX = motionEvent.getRawX() - mDownX; |
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if (Math.abs(deltaX) > mSlop) { |
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mSwiping = true; |
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mListView.requestDisallowInterceptTouchEvent(true); |
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// Cancel ListView's touch (un-highlighting the item)
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MotionEvent cancelEvent = MotionEvent.obtain(motionEvent); |
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cancelEvent.setAction(MotionEvent.ACTION_CANCEL |
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| (motionEvent.getActionIndex() << MotionEvent.ACTION_POINTER_INDEX_SHIFT)); |
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mListView.onTouchEvent(cancelEvent); |
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cancelEvent.recycle(); |
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} |
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mVelocityTracker.addMovement(motionEvent); |
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float deltaX = motionEvent.getRawX() - mDownX; |
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if (Math.abs(deltaX) > mSlop) { |
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mSwiping = true; |
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mListView.requestDisallowInterceptTouchEvent(true); |
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// Cancel ListView's touch (un-highlighting the item)
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MotionEvent cancelEvent = MotionEvent.obtain(motionEvent); |
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cancelEvent.setAction(MotionEvent.ACTION_CANCEL |
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| (motionEvent.getActionIndex() << MotionEvent.ACTION_POINTER_INDEX_SHIFT)); |
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mListView.onTouchEvent(cancelEvent); |
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cancelEvent.recycle(); |
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} |
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if (mSwiping) { |
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mDownView.setTranslationX(deltaX); |
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mDownView.setAlpha(Math.max(0.15f, Math.min(1f, 1f - 2f * Math.abs(deltaX) / mViewWidth))); |
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return true; |
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if (mSwiping) { |
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mDownView.setTranslationX(deltaX); |
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mDownView.setAlpha(Math.max(0.15f, Math.min(1f, 1f - 2f * Math.abs(deltaX) / mViewWidth))); |
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return true; |
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} |
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break; |
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} |
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break; |
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} |
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} |
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return false; |
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} |
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@ -324,7 +319,7 @@ public class SwipeDismissListViewTouchListener implements View.OnTouchListener { |
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if (view == null) { |
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// No view, shortcut to calling onDismiss to let it deal with adapter
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// updates and all that.
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mCallbacks.onDismiss(mListView, new int[] { position }); |
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mCallbacks.onDismiss(mListView, new int[]{position}); |
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return; |
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} |
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Florens Douwes
11 years ago