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| -rw-r--r-- | src/com/android/dialer/widget/ViewDragHelper.java | 1574 |
1 files changed, 0 insertions, 1574 deletions
diff --git a/src/com/android/dialer/widget/ViewDragHelper.java b/src/com/android/dialer/widget/ViewDragHelper.java deleted file mode 100644 index fe3ab8230..000000000 --- a/src/com/android/dialer/widget/ViewDragHelper.java +++ /dev/null @@ -1,1574 +0,0 @@ -/* - * Copyright (C) 2013 The Android Open Source Project - * - * Licensed under the Apache License, Version 2.0 (the "License"); - * you may not use this file except in compliance with the License. - * You may obtain a copy of the License at - * - * http://www.apache.org/licenses/LICENSE-2.0 - * - * Unless required by applicable law or agreed to in writing, software - * distributed under the License is distributed on an "AS IS" BASIS, - * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. - * See the License for the specific language governing permissions and - * limitations under the License. - */ - - -package com.android.dialer.widget; - -import android.content.Context; -import android.support.v4.view.MotionEventCompat; -import android.support.v4.view.VelocityTrackerCompat; -import android.support.v4.view.ViewCompat; -import android.util.Log; -import android.view.MotionEvent; -import android.view.VelocityTracker; -import android.view.View; -import android.view.ViewConfiguration; -import android.view.ViewGroup; -import android.widget.Scroller; - -import java.util.Arrays; - -/** - * ViewDragHelper is a utility class for writing custom ViewGroups. It offers a number - * of useful operations and state tracking for allowing a user to drag and reposition - * views within their parent ViewGroup. - */ -public class ViewDragHelper { - private static final String TAG = "ViewDragHelper"; - - /** - * A null/invalid pointer ID. - */ - public static final int INVALID_POINTER = -1; - - /** - * A view is not currently being dragged or animating as a result of a fling/snap. - */ - public static final int STATE_IDLE = 0; - - /** - * A view is currently being dragged. The position is currently changing as a result - * of user input or simulated user input. - */ - public static final int STATE_DRAGGING = 1; - - /** - * A view is currently settling into place as a result of a fling or - * predefined non-interactive motion. - */ - public static final int STATE_SETTLING = 2; - - /** - * Edge flag indicating that the left edge should be affected. - */ - public static final int EDGE_LEFT = 1 << 0; - - /** - * Edge flag indicating that the right edge should be affected. - */ - public static final int EDGE_RIGHT = 1 << 1; - - /** - * Edge flag indicating that the top edge should be affected. - */ - public static final int EDGE_TOP = 1 << 2; - - /** - * Edge flag indicating that the bottom edge should be affected. - */ - public static final int EDGE_BOTTOM = 1 << 3; - - /** - * Edge flag set indicating all edges should be affected. - */ - public static final int EDGE_ALL = EDGE_LEFT | EDGE_TOP | EDGE_RIGHT | EDGE_BOTTOM; - - /** - * Indicates that a check should occur along the horizontal axis - */ - public static final int DIRECTION_HORIZONTAL = 1 << 0; - - /** - * Indicates that a check should occur along the vertical axis - */ - public static final int DIRECTION_VERTICAL = 1 << 1; - - /** - * Indicates that a check should occur along all axes - */ - public static final int DIRECTION_ALL = DIRECTION_HORIZONTAL | DIRECTION_VERTICAL; - - private static final int EDGE_SIZE = 20; // dp - - private static final int BASE_SETTLE_DURATION = 256; // ms - private static final int MAX_SETTLE_DURATION = 600; // ms - - // Current drag state; idle, dragging or settling - private int mDragState; - - // Distance to travel before a drag may begin - private int mTouchSlop; - - // Last known position/pointer tracking - private int mActivePointerId = INVALID_POINTER; - private float[] mInitialMotionX; - private float[] mInitialMotionY; - private float[] mLastMotionX; - private float[] mLastMotionY; - private int[] mInitialEdgesTouched; - private int[] mEdgeDragsInProgress; - private int[] mEdgeDragsLocked; - private int mPointersDown; - - private VelocityTracker mVelocityTracker; - private float mMaxVelocity; - private float mMinVelocity; - - private int mEdgeSize; - private int mTrackingEdges; - - // We need to use a Scroller instead of an OverScroller (b/17700698) and as a result, we need - // to keep track of the final scroll position ourselves in mFinalScrollY (b/17704016) whenever - // we programmatically scroll or fling mScroller. - private Scroller mScroller; - private int mFinalScrollY; - - private final Callback mCallback; - - private View mCapturedView; - private boolean mReleaseInProgress; - - private final ViewGroup mParentView; - - /** - * A Callback is used as a communication channel with the ViewDragHelper back to the - * parent view using it. <code>on*</code>methods are invoked on siginficant events and several - * accessor methods are expected to provide the ViewDragHelper with more information - * about the state of the parent view upon request. The callback also makes decisions - * governing the range and draggability of child views. - */ - public static abstract class Callback { - /** - * Called when the drag state changes. See the <code>STATE_*</code> constants - * for more information. - * - * @param state The new drag state - * - * @see #STATE_IDLE - * @see #STATE_DRAGGING - * @see #STATE_SETTLING - */ - public void onViewDragStateChanged(int state) {} - - /** - * Called when the captured view's position changes as the result of a drag or settle. - * - * @param changedView View whose position changed - * @param left New X coordinate of the left edge of the view - * @param top New Y coordinate of the top edge of the view - * @param dx Change in X position from the last call - * @param dy Change in Y position from the last call - */ - public void onViewPositionChanged(View changedView, int left, int top, int dx, int dy) {} - - /** - * Called when a child view is captured for dragging or settling. The ID of the pointer - * currently dragging the captured view is supplied. If activePointerId is - * identified as {@link #INVALID_POINTER} the capture is programmatic instead of - * pointer-initiated. - * - * @param capturedChild Child view that was captured - * @param activePointerId Pointer id tracking the child capture - */ - public void onViewCaptured(View capturedChild, int activePointerId) {} - - /** - * Called when the child view is no longer being actively dragged. - * The fling velocity is also supplied, if relevant. The velocity values may - * be clamped to system minimums or maximums. - * - * <p>Calling code may decide to fling or otherwise release the view to let it - * settle into place. It should do so using {@link #settleCapturedViewAt(int, int)} - * or {@link #flingCapturedView(int, int, int, int)}. If the Callback invokes - * one of these methods, the ViewDragHelper will enter {@link #STATE_SETTLING} - * and the view capture will not fully end until it comes to a complete stop. - * If neither of these methods is invoked before <code>onViewReleased</code> returns, - * the view will stop in place and the ViewDragHelper will return to - * {@link #STATE_IDLE}.</p> - * - * @param releasedChild The captured child view now being released - * @param xvel X velocity of the pointer as it left the screen in pixels per second. - * @param yvel Y velocity of the pointer as it left the screen in pixels per second. - */ - public void onViewReleased(View releasedChild, float xvel, float yvel) {} - - /** - * Called when the child view has been released with a fling. - * - * <p>Calling code may decide to fling or otherwise release the view to let it - * settle into place.</p> - * - * @param releasedChild The captured child view now being released - * @param xvel X velocity of the fling. - * @param yvel Y velocity of the fling. - */ - public void onViewFling(View releasedChild, float xvel, float yvel) {} - - /** - * Called when one of the subscribed edges in the parent view has been touched - * by the user while no child view is currently captured. - * - * @param edgeFlags A combination of edge flags describing the edge(s) currently touched - * @param pointerId ID of the pointer touching the described edge(s) - * @see #EDGE_LEFT - * @see #EDGE_TOP - * @see #EDGE_RIGHT - * @see #EDGE_BOTTOM - */ - public void onEdgeTouched(int edgeFlags, int pointerId) {} - - /** - * Called when the given edge may become locked. This can happen if an edge drag - * was preliminarily rejected before beginning, but after {@link #onEdgeTouched(int, int)} - * was called. This method should return true to lock this edge or false to leave it - * unlocked. The default behavior is to leave edges unlocked. - * - * @param edgeFlags A combination of edge flags describing the edge(s) locked - * @return true to lock the edge, false to leave it unlocked - */ - public boolean onEdgeLock(int edgeFlags) { - return false; - } - - /** - * Called when the user has started a deliberate drag away from one - * of the subscribed edges in the parent view while no child view is currently captured. - * - * @param edgeFlags A combination of edge flags describing the edge(s) dragged - * @param pointerId ID of the pointer touching the described edge(s) - * @see #EDGE_LEFT - * @see #EDGE_TOP - * @see #EDGE_RIGHT - * @see #EDGE_BOTTOM - */ - public void onEdgeDragStarted(int edgeFlags, int pointerId) {} - - /** - * Called to determine the Z-order of child views. - * - * @param index the ordered position to query for - * @return index of the view that should be ordered at position <code>index</code> - */ - public int getOrderedChildIndex(int index) { - return index; - } - - /** - * Return the magnitude of a draggable child view's horizontal range of motion in pixels. - * This method should return 0 for views that cannot move horizontally. - * - * @param child Child view to check - * @return range of horizontal motion in pixels - */ - public int getViewHorizontalDragRange(View child) { - return 0; - } - - /** - * Return the magnitude of a draggable child view's vertical range of motion in pixels. - * This method should return 0 for views that cannot move vertically. - * - * @param child Child view to check - * @return range of vertical motion in pixels - */ - public int getViewVerticalDragRange(View child) { - return 0; - } - - /** - * Called when the user's input indicates that they want to capture the given child view - * with the pointer indicated by pointerId. The callback should return true if the user - * is permitted to drag the given view with the indicated pointer. - * - * <p>ViewDragHelper may call this method multiple times for the same view even if - * the view is already captured; this indicates that a new pointer is trying to take - * control of the view.</p> - * - * <p>If this method returns true, a call to {@link #onViewCaptured(android.view.View, int)} - * will follow if the capture is successful.</p> - * - * @param child Child the user is attempting to capture - * @param pointerId ID of the pointer attempting the capture - * @return true if capture should be allowed, false otherwise - */ - public abstract boolean tryCaptureView(View child, int pointerId); - - /** - * Restrict the motion of the dragged child view along the horizontal axis. - * The default implementation does not allow horizontal motion; the extending - * class must override this method and provide the desired clamping. - * - * - * @param child Child view being dragged - * @param left Attempted motion along the X axis - * @param dx Proposed change in position for left - * @return The new clamped position for left - */ - public int clampViewPositionHorizontal(View child, int left, int dx) { - return 0; - } - - /** - * Restrict the motion of the dragged child view along the vertical axis. - * The default implementation does not allow vertical motion; the extending - * class must override this method and provide the desired clamping. - * - * - * @param child Child view being dragged - * @param top Attempted motion along the Y axis - * @param dy Proposed change in position for top - * @return The new clamped position for top - */ - public int clampViewPositionVertical(View child, int top, int dy) { - return 0; - } - } - - private final Runnable mSetIdleRunnable = new Runnable() { - public void run() { - setDragState(STATE_IDLE); - } - }; - - /** - * Factory method to create a new ViewDragHelper. - * - * @param forParent Parent view to monitor - * @param cb Callback to provide information and receive events - * @return a new ViewDragHelper instance - */ - public static ViewDragHelper create(ViewGroup forParent, Callback cb) { - return new ViewDragHelper(forParent.getContext(), forParent, cb); - } - - /** - * Factory method to create a new ViewDragHelper. - * - * @param forParent Parent view to monitor - * @param sensitivity Multiplier for how sensitive the helper should be about detecting - * the start of a drag. Larger values are more sensitive. 1.0f is normal. - * @param cb Callback to provide information and receive events - * @return a new ViewDragHelper instance - */ - public static ViewDragHelper create(ViewGroup forParent, float sensitivity, Callback cb) { - final ViewDragHelper helper = create(forParent, cb); - helper.mTouchSlop = (int) (helper.mTouchSlop * (1 / sensitivity)); - return helper; - } - - /** - * Apps should use ViewDragHelper.create() to get a new instance. - * This will allow VDH to use internal compatibility implementations for different - * platform versions. - * - * @param context Context to initialize config-dependent params from - * @param forParent Parent view to monitor - */ - private ViewDragHelper(Context context, ViewGroup forParent, Callback cb) { - if (forParent == null) { - throw new IllegalArgumentException("Parent view may not be null"); - } - if (cb == null) { - throw new IllegalArgumentException("Callback may not be null"); - } - - mParentView = forParent; - mCallback = cb; - - final ViewConfiguration vc = ViewConfiguration.get(context); - final float density = context.getResources().getDisplayMetrics().density; - mEdgeSize = (int) (EDGE_SIZE * density + 0.5f); - - mTouchSlop = vc.getScaledTouchSlop(); - mMaxVelocity = vc.getScaledMaximumFlingVelocity(); - mMinVelocity = vc.getScaledMinimumFlingVelocity(); - mScroller = new Scroller(context); - } - - /** - * Set the minimum velocity that will be detected as having a magnitude greater than zero - * in pixels per second. Callback methods accepting a velocity will be clamped appropriately. - * - * @param minVel Minimum velocity to detect - */ - public void setMinVelocity(float minVel) { - mMinVelocity = minVel; - } - - /** - * Return the currently configured minimum velocity. Any flings with a magnitude less - * than this value in pixels per second. Callback methods accepting a velocity will receive - * zero as a velocity value if the real detected velocity was below this threshold. - * - * @return the minimum velocity that will be detected - */ - public float getMinVelocity() { - return mMinVelocity; - } - - /** - * Retrieve the current drag state of this helper. This will return one of - * {@link #STATE_IDLE}, {@link #STATE_DRAGGING} or {@link #STATE_SETTLING}. - * @return The current drag state - */ - public int getViewDragState() { - return mDragState; - } - - /** - * Enable edge tracking for the selected edges of the parent view. - * The callback's {@link Callback#onEdgeTouched(int, int)} and - * {@link Callback#onEdgeDragStarted(int, int)} methods will only be invoked - * for edges for which edge tracking has been enabled. - * - * @param edgeFlags Combination of edge flags describing the edges to watch - * @see #EDGE_LEFT - * @see #EDGE_TOP - * @see #EDGE_RIGHT - * @see #EDGE_BOTTOM - */ - public void setEdgeTrackingEnabled(int edgeFlags) { - mTrackingEdges = edgeFlags; - } - - /** - * Return the size of an edge. This is the range in pixels along the edges of this view - * that will actively detect edge touches or drags if edge tracking is enabled. - * - * @return The size of an edge in pixels - * @see #setEdgeTrackingEnabled(int) - */ - public int getEdgeSize() { - return mEdgeSize; - } - - /** - * Capture a specific child view for dragging within the parent. The callback will be notified - * but {@link Callback#tryCaptureView(android.view.View, int)} will not be asked permission to - * capture this view. - * - * @param childView Child view to capture - * @param activePointerId ID of the pointer that is dragging the captured child view - */ - public void captureChildView(View childView, int activePointerId) { - if (childView.getParent() != mParentView) { - throw new IllegalArgumentException("captureChildView: parameter must be a descendant " + - "of the ViewDragHelper's tracked parent view (" + mParentView + ")"); - } - - mCapturedView = childView; - mActivePointerId = activePointerId; - mCallback.onViewCaptured(childView, activePointerId); - setDragState(STATE_DRAGGING); - } - - /** - * @return The currently captured view, or null if no view has been captured. - */ - public View getCapturedView() { - return mCapturedView; - } - - /** - * @return The ID of the pointer currently dragging the captured view, - * or {@link #INVALID_POINTER}. - */ - public int getActivePointerId() { - return mActivePointerId; - } - - /** - * @return The minimum distance in pixels that the user must travel to initiate a drag - */ - public int getTouchSlop() { - return mTouchSlop; - } - - /** - * The result of a call to this method is equivalent to - * {@link #processTouchEvent(android.view.MotionEvent)} receiving an ACTION_CANCEL event. - */ - public void cancel() { - mActivePointerId = INVALID_POINTER; - clearMotionHistory(); - - if (mVelocityTracker != null) { - mVelocityTracker.recycle(); - mVelocityTracker = null; - } - } - - /** - * {@link #cancel()}, but also abort all motion in progress and snap to the end of any - * animation. - */ - public void abort() { - cancel(); - if (mDragState == STATE_SETTLING) { - final int oldX = mScroller.getCurrX(); - final int oldY = mScroller.getCurrY(); - mScroller.abortAnimation(); - final int newX = mScroller.getCurrX(); - final int newY = mScroller.getCurrY(); - mCallback.onViewPositionChanged(mCapturedView, newX, newY, newX - oldX, newY - oldY); - } - setDragState(STATE_IDLE); - } - - /** - * Animate the view <code>child</code> to the given (left, top) position. - * If this method returns true, the caller should invoke {@link #continueSettling(boolean)} - * on each subsequent frame to continue the motion until it returns false. If this method - * returns false there is no further work to do to complete the movement. - * - * <p>This operation does not count as a capture event, though {@link #getCapturedView()} - * will still report the sliding view while the slide is in progress.</p> - * - * @param child Child view to capture and animate - * @param finalLeft Final left position of child - * @param finalTop Final top position of child - * @return true if animation should continue through {@link #continueSettling(boolean)} calls - */ - public boolean smoothSlideViewTo(View child, int finalLeft, int finalTop) { - mCapturedView = child; - mActivePointerId = INVALID_POINTER; - - return forceSettleCapturedViewAt(finalLeft, finalTop, 0, 0); - } - - /** - * Settle the captured view at the given (left, top) position. - * The appropriate velocity from prior motion will be taken into account. - * If this method returns true, the caller should invoke {@link #continueSettling(boolean)} - * on each subsequent frame to continue the motion until it returns false. If this method - * returns false there is no further work to do to complete the movement. - * - * @param finalLeft Settled left edge position for the captured view - * @param finalTop Settled top edge position for the captured view - * @return true if animation should continue through {@link #continueSettling(boolean)} calls - */ - public boolean settleCapturedViewAt(int finalLeft, int finalTop) { - if (!mReleaseInProgress) { - throw new IllegalStateException("Cannot settleCapturedViewAt outside of a call to " + - "Callback#onViewReleased"); - } - - return forceSettleCapturedViewAt(finalLeft, finalTop, - (int) VelocityTrackerCompat.getXVelocity(mVelocityTracker, mActivePointerId), - (int) VelocityTrackerCompat.getYVelocity(mVelocityTracker, mActivePointerId)); - } - - /** - * Settle the captured view at the given (left, top) position. - * - * @param finalLeft Target left position for the captured view - * @param finalTop Target top position for the captured view - * @param xvel Horizontal velocity - * @param yvel Vertical velocity - * @return true if animation should continue through {@link #continueSettling(boolean)} calls - */ - private boolean forceSettleCapturedViewAt(int finalLeft, int finalTop, int xvel, int yvel) { - final int startLeft = mCapturedView.getLeft(); - final int startTop = mCapturedView.getTop(); - final int dx = finalLeft - startLeft; - final int dy = finalTop - startTop; - - if (dx == 0 && dy == 0) { - // Nothing to do. Send callbacks, be done. - mScroller.abortAnimation(); - setDragState(STATE_IDLE); - return false; - } - - final int duration = computeSettleDuration(mCapturedView, dx, dy, xvel, yvel); - mScroller.startScroll(startLeft, startTop, dx, dy, duration); - mFinalScrollY = startTop + dy; - - setDragState(STATE_SETTLING); - return true; - } - - private int computeSettleDuration(View child, int dx, int dy, int xvel, int yvel) { - xvel = clampMag(xvel, (int) mMinVelocity, (int) mMaxVelocity); - yvel = clampMag(yvel, (int) mMinVelocity, (int) mMaxVelocity); - final int absDx = Math.abs(dx); - final int absDy = Math.abs(dy); - final int absXVel = Math.abs(xvel); - final int absYVel = Math.abs(yvel); - final int addedVel = absXVel + absYVel; - final int addedDistance = absDx + absDy; - - final float xweight = xvel != 0 ? (float) absXVel / addedVel : - (float) absDx / addedDistance; - final float yweight = yvel != 0 ? (float) absYVel / addedVel : - (float) absDy / addedDistance; - - int xduration = computeAxisDuration(dx, xvel, mCallback.getViewHorizontalDragRange(child)); - int yduration = computeAxisDuration(dy, yvel, mCallback.getViewVerticalDragRange(child)); - - return (int) (xduration * xweight + yduration * yweight); - } - - private int computeAxisDuration(int delta, int velocity, int motionRange) { - if (delta == 0) { - return 0; - } - - final int width = mParentView.getWidth(); - final int halfWidth = width / 2; - final float distanceRatio = Math.min(1f, (float) Math.abs(delta) / width); - final float distance = halfWidth + halfWidth * - distanceInfluenceForSnapDuration(distanceRatio); - - int duration; - velocity = Math.abs(velocity); - if (velocity > 0) { - duration = 4 * Math.round(1000 * Math.abs(distance / velocity)); - } else { - final float range = (float) Math.abs(delta) / motionRange; - duration = (int) ((range + 1) * BASE_SETTLE_DURATION); - } - return Math.min(duration, MAX_SETTLE_DURATION); - } - - /** - * Clamp the magnitude of value for absMin and absMax. - * If the value is below the minimum, it will be clamped to zero. - * If the value is above the maximum, it will be clamped to the maximum. - * - * @param value Value to clamp - * @param absMin Absolute value of the minimum significant value to return - * @param absMax Absolute value of the maximum value to return - * @return The clamped value with the same sign as <code>value</code> - */ - private int clampMag(int value, int absMin, int absMax) { - final int absValue = Math.abs(value); - if (absValue < absMin) return 0; - if (absValue > absMax) return value > 0 ? absMax : -absMax; - return value; - } - - /** - * Clamp the magnitude of value for absMin and absMax. - * If the value is below the minimum, it will be clamped to zero. - * If the value is above the maximum, it will be clamped to the maximum. - * - * @param value Value to clamp - * @param absMin Absolute value of the minimum significant value to return - * @param absMax Absolute value of the maximum value to return - * @return The clamped value with the same sign as <code>value</code> - */ - private float clampMag(float value, float absMin, float absMax) { - final float absValue = Math.abs(value); - if (absValue < absMin) return 0; - if (absValue > absMax) return value > 0 ? absMax : -absMax; - return value; - } - - private float distanceInfluenceForSnapDuration(float f) { - f -= 0.5f; // center the values about 0. - f *= 0.3f * Math.PI / 2.0f; - return (float) Math.sin(f); - } - - /** - * Settle the captured view based on standard free-moving fling behavior. - * The caller should invoke {@link #continueSettling(boolean)} on each subsequent frame - * to continue the motion until it returns false. - * - * @param minLeft Minimum X position for the view's left edge - * @param minTop Minimum Y position for the view's top edge - * @param maxLeft Maximum X position for the view's left edge - * @param maxTop Maximum Y position for the view's top edge - */ - public void flingCapturedView(int minLeft, int minTop, int maxLeft, int maxTop) { - if (!mReleaseInProgress) { - throw new IllegalStateException("Cannot flingCapturedView outside of a call to " + - "Callback#onViewReleased"); - } - - final int yVelocity = (int) VelocityTrackerCompat - .getYVelocity(mVelocityTracker, mActivePointerId); - mScroller.fling(mCapturedView.getLeft(), mCapturedView.getTop(), - (int) VelocityTrackerCompat.getXVelocity(mVelocityTracker, mActivePointerId), - yVelocity, minLeft, maxLeft, minTop, maxTop); - mFinalScrollY = yVelocity < 0 ? minTop : maxTop; - - setDragState(STATE_SETTLING); - } - - /** - * Settle the captured view based on standard free-moving fling behavior. - * The caller should invoke {@link #continueSettling(boolean)} on each subsequent frame - * to continue the motion until it returns false. - * - * @param minLeft Minimum X position for the view's left edge - * @param minTop Minimum Y position for the view's top edge - * @param maxLeft Maximum X position for the view's left edge - * @param maxTop Maximum Y position for the view's top edge - * @param yvel the Y velocity to fling with - */ - public void flingCapturedView(int minLeft, int minTop, int maxLeft, int maxTop, int yvel) { - if (!mReleaseInProgress) { - throw new IllegalStateException("Cannot flingCapturedView outside of a call to " + - "Callback#onViewReleased"); - } - mScroller.abortAnimation(); - mScroller.fling(mCapturedView.getLeft(), mCapturedView.getTop(), 0, yvel, - Integer.MIN_VALUE, Integer.MAX_VALUE, Integer.MIN_VALUE, Integer.MAX_VALUE); - mFinalScrollY = yvel < 0 ? minTop : maxTop; - - setDragState(STATE_SETTLING); - } - - /** - * Predict how far a fling with {@param yvel} will cause the view to travel from stand still. - * @return predicted y offset - */ - public int predictFlingYOffset(int yvel) { - mScroller.abortAnimation(); - mScroller.fling(0, 0, 0, yvel, Integer.MIN_VALUE, Integer.MAX_VALUE, Integer.MIN_VALUE, - Integer.MAX_VALUE); - final int finalY = mScroller.getFinalY(); - mScroller.abortAnimation(); - return finalY; - } - - /** - * Move the captured settling view by the appropriate amount for the current time. - * If <code>continueSettling</code> returns true, the caller should call it again - * on the next frame to continue. - * - * @param deferCallbacks true if state callbacks should be deferred via posted message. - * Set this to true if you are calling this method from - * {@link android.view.View#computeScroll()} or similar methods - * invoked as part of layout or drawing. - * @return true if settle is still in progress - */ - public boolean continueSettling(boolean deferCallbacks) { - if (mDragState == STATE_SETTLING) { - boolean keepGoing = mScroller.computeScrollOffset(); - int y = mScroller.getCurrY(); - - // Since Scroller's getFinalY() can't be properly set (b/17704016), we need to - // perform clamping of mScroller.getCurrY() here. - if (y - mCapturedView.getTop() > 0) { - y = Math.min(y, mFinalScrollY); - } else { - y = Math.max(y, mFinalScrollY); - } - final int dy = y - mCapturedView.getTop(); - - if (dy != 0) { - mCapturedView.offsetTopAndBottom(dy); - mCallback.onViewPositionChanged(mCapturedView, 0, y, 0, dy); - } - - if (keepGoing && y == mFinalScrollY) { - // Close enough. The interpolator/scroller might think we're still moving - // but the user sure doesn't. - mScroller.abortAnimation(); - keepGoing = mScroller.isFinished(); - } - - if (!keepGoing) { - if (deferCallbacks) { - mParentView.post(mSetIdleRunnable); - } else { - setDragState(STATE_IDLE); - } - } - } - - return mDragState == STATE_SETTLING; - } - - public void processNestedFling(View target, int yvel) { - mCapturedView = target; - dispatchViewFling(0, yvel); - } - - public int getVelocityMagnitude() { - // Use Math.abs() to ensure this always returns an absolute value, even if the - // ScrollerCompat implementation changes. - return (int) Math.abs(mScroller.getCurrVelocity()); - } - - private void dispatchViewFling(float xvel, float yvel) { - mReleaseInProgress = true; - mCallback.onViewFling(mCapturedView, xvel, yvel); - mReleaseInProgress = false; - - if (mDragState == STATE_DRAGGING) { - // onViewReleased didn't call a method that would have changed this. Go idle. - setDragState(STATE_IDLE); - } - } - - /** - * Like all callback events this must happen on the UI thread, but release - * involves some extra semantics. During a release (mReleaseInProgress) - * is the only time it is valid to call {@link #settleCapturedViewAt(int, int)} - * or {@link #flingCapturedView(int, int, int, int)}. - */ - private void dispatchViewReleased(float xvel, float yvel) { - mReleaseInProgress = true; - mCallback.onViewReleased(mCapturedView, xvel, yvel); - mReleaseInProgress = false; - - if (mDragState == STATE_DRAGGING) { - // onViewReleased didn't call a method that would have changed this. Go idle. - setDragState(STATE_IDLE); - } - } - - private void clearMotionHistory() { - if (mInitialMotionX == null) { - return; - } - Arrays.fill(mInitialMotionX, 0); - Arrays.fill(mInitialMotionY, 0); - Arrays.fill(mLastMotionX, 0); - Arrays.fill(mLastMotionY, 0); - Arrays.fill(mInitialEdgesTouched, 0); - Arrays.fill(mEdgeDragsInProgress, 0); - Arrays.fill(mEdgeDragsLocked, 0); - mPointersDown = 0; - } - - private void clearMotionHistory(int pointerId) { - if (mInitialMotionX == null) { - return; - } - mInitialMotionX[pointerId] = 0; - mInitialMotionY[pointerId] = 0; - mLastMotionX[pointerId] = 0; - mLastMotionY[pointerId] = 0; - mInitialEdgesTouched[pointerId] = 0; - mEdgeDragsInProgress[pointerId] = 0; - mEdgeDragsLocked[pointerId] = 0; - mPointersDown &= ~(1 << pointerId); - } - - private void ensureMotionHistorySizeForId(int pointerId) { - if (mInitialMotionX == null || mInitialMotionX.length <= pointerId) { - float[] imx = new float[pointerId + 1]; - float[] imy = new float[pointerId + 1]; - float[] lmx = new float[pointerId + 1]; - float[] lmy = new float[pointerId + 1]; - int[] iit = new int[pointerId + 1]; - int[] edip = new int[pointerId + 1]; - int[] edl = new int[pointerId + 1]; - - if (mInitialMotionX != null) { - System.arraycopy(mInitialMotionX, 0, imx, 0, mInitialMotionX.length); - System.arraycopy(mInitialMotionY, 0, imy, 0, mInitialMotionY.length); - System.arraycopy(mLastMotionX, 0, lmx, 0, mLastMotionX.length); - System.arraycopy(mLastMotionY, 0, lmy, 0, mLastMotionY.length); - System.arraycopy(mInitialEdgesTouched, 0, iit, 0, mInitialEdgesTouched.length); - System.arraycopy(mEdgeDragsInProgress, 0, edip, 0, mEdgeDragsInProgress.length); - System.arraycopy(mEdgeDragsLocked, 0, edl, 0, mEdgeDragsLocked.length); - } - - mInitialMotionX = imx; - mInitialMotionY = imy; - mLastMotionX = lmx; - mLastMotionY = lmy; - mInitialEdgesTouched = iit; - mEdgeDragsInProgress = edip; - mEdgeDragsLocked = edl; - } - } - - private void saveInitialMotion(float x, float y, int pointerId) { - ensureMotionHistorySizeForId(pointerId); - mInitialMotionX[pointerId] = mLastMotionX[pointerId] = x; - mInitialMotionY[pointerId] = mLastMotionY[pointerId] = y; - mInitialEdgesTouched[pointerId] = getEdgesTouched((int) x, (int) y); - mPointersDown |= 1 << pointerId; - } - - private void saveLastMotion(MotionEvent ev) { - final int pointerCount = MotionEventCompat.getPointerCount(ev); - for (int i = 0; i < pointerCount; i++) { - final int pointerId = MotionEventCompat.getPointerId(ev, i); - final float x = MotionEventCompat.getX(ev, i); - final float y = MotionEventCompat.getY(ev, i); - mLastMotionX[pointerId] = x; - mLastMotionY[pointerId] = y; - } - } - - /** - * Check if the given pointer ID represents a pointer that is currently down (to the best - * of the ViewDragHelper's knowledge). - * - * <p>The state used to report this information is populated by the methods - * {@link #shouldInterceptTouchEvent(android.view.MotionEvent)} or - * {@link #processTouchEvent(android.view.MotionEvent)}. If one of these methods has not - * been called for all relevant MotionEvents to track, the information reported - * by this method may be stale or incorrect.</p> - * - * @param pointerId pointer ID to check; corresponds to IDs provided by MotionEvent - * @return true if the pointer with the given ID is still down - */ - public boolean isPointerDown(int pointerId) { - return (mPointersDown & 1 << pointerId) != 0; - } - - void setDragState(int state) { - if (mDragState != state) { - mDragState = state; - mCallback.onViewDragStateChanged(state); - if (state == STATE_IDLE) { - mCapturedView = null; - } - } - } - - /** - * Attempt to capture the view with the given pointer ID. The callback will be involved. - * This will put us into the "dragging" state. If we've already captured this view with - * this pointer this method will immediately return true without consulting the callback. - * - * @param toCapture View to capture - * @param pointerId Pointer to capture with - * @return true if capture was successful - */ - boolean tryCaptureViewForDrag(View toCapture, int pointerId) { - if (toCapture == mCapturedView && mActivePointerId == pointerId) { - // Already done! - return true; - } - if (toCapture != null && mCallback.tryCaptureView(toCapture, pointerId)) { - mActivePointerId = pointerId; - captureChildView(toCapture, pointerId); - return true; - } - return false; - } - - /** - * Tests scrollability within child views of v given a delta of dx. - * - * @param v View to test for horizontal scrollability - * @param checkV Whether the view v passed should itself be checked for scrollability (true), - * or just its children (false). - * @param dx Delta scrolled in pixels along the X axis - * @param dy Delta scrolled in pixels along the Y axis - * @param x X coordinate of the active touch point - * @param y Y coordinate of the active touch point - * @return true if child views of v can be scrolled by delta of dx. - */ - protected boolean canScroll(View v, boolean checkV, int dx, int dy, int x, int y) { - if (v instanceof ViewGroup) { - final ViewGroup group = (ViewGroup) v; - final int scrollX = v.getScrollX(); - final int scrollY = v.getScrollY(); - final int count = group.getChildCount(); - // Count backwards - let topmost views consume scroll distance first. - for (int i = count - 1; i >= 0; i--) { - // TODO: Add versioned support here for transformed views. - // This will not work for transformed views in Honeycomb+ - final View child = group.getChildAt(i); - if (x + scrollX >= child.getLeft() && x + scrollX < child.getRight() && - y + scrollY >= child.getTop() && y + scrollY < child.getBottom() && - canScroll(child, true, dx, dy, x + scrollX - child.getLeft(), - y + scrollY - child.getTop())) { - return true; - } - } - } - - return checkV && (ViewCompat.canScrollHorizontally(v, -dx) || - ViewCompat.canScrollVertically(v, -dy)); - } - - /** - * Check if this event as provided to the parent view's onInterceptTouchEvent should - * cause the parent to intercept the touch event stream. - * - * @param ev MotionEvent provided to onInterceptTouchEvent - * @return true if the parent view should return true from onInterceptTouchEvent - */ - public boolean shouldInterceptTouchEvent(MotionEvent ev) { - final int action = MotionEventCompat.getActionMasked(ev); - final int actionIndex = MotionEventCompat.getActionIndex(ev); - - if (action == MotionEvent.ACTION_DOWN) { - // Reset things for a new event stream, just in case we didn't get - // the whole previous stream. - cancel(); - } - - if (mVelocityTracker == null) { - mVelocityTracker = VelocityTracker.obtain(); - } - mVelocityTracker.addMovement(ev); - - switch (action) { - case MotionEvent.ACTION_DOWN: { - final float x = ev.getX(); - final float y = ev.getY(); - final int pointerId = MotionEventCompat.getPointerId(ev, 0); - saveInitialMotion(x, y, pointerId); - - final View toCapture = findTopChildUnder((int) x, (int) y); - - // Catch a settling view if possible. - if (toCapture == mCapturedView && mDragState == STATE_SETTLING) { - tryCaptureViewForDrag(toCapture, pointerId); - } - - final int edgesTouched = mInitialEdgesTouched[pointerId]; - if ((edgesTouched & mTrackingEdges) != 0) { - mCallback.onEdgeTouched(edgesTouched & mTrackingEdges, pointerId); - } - break; - } - - case MotionEventCompat.ACTION_POINTER_DOWN: { - final int pointerId = MotionEventCompat.getPointerId(ev, actionIndex); - final float x = MotionEventCompat.getX(ev, actionIndex); - final float y = MotionEventCompat.getY(ev, actionIndex); - - saveInitialMotion(x, y, pointerId); - - // A ViewDragHelper can only manipulate one view at a time. - if (mDragState == STATE_IDLE) { - final int edgesTouched = mInitialEdgesTouched[pointerId]; - if ((edgesTouched & mTrackingEdges) != 0) { - mCallback.onEdgeTouched(edgesTouched & mTrackingEdges, pointerId); - } - } else if (mDragState == STATE_SETTLING) { - // Catch a settling view if possible. - final View toCapture = findTopChildUnder((int) x, (int) y); - if (toCapture == mCapturedView) { - tryCaptureViewForDrag(toCapture, pointerId); - } - } - break; - } - - case MotionEvent.ACTION_MOVE: { - // First to cross a touch slop over a draggable view wins. Also report edge drags. - final int pointerCount = MotionEventCompat.getPointerCount(ev); - for (int i = 0; i < pointerCount; i++) { - final int pointerId = MotionEventCompat.getPointerId(ev, i); - final float x = MotionEventCompat.getX(ev, i); - final float y = MotionEventCompat.getY(ev, i); - final float dx = x - mInitialMotionX[pointerId]; - final float dy = y - mInitialMotionY[pointerId]; - - reportNewEdgeDrags(dx, dy, pointerId); - if (mDragState == STATE_DRAGGING) { - // Callback might have started an edge drag - break; - } - - final View toCapture = findTopChildUnder((int) x, (int) y); - if (toCapture != null && checkTouchSlop(toCapture, dx, dy) && - tryCaptureViewForDrag(toCapture, pointerId)) { - break; - } - } - saveLastMotion(ev); - break; - } - - case MotionEventCompat.ACTION_POINTER_UP: { - final int pointerId = MotionEventCompat.getPointerId(ev, actionIndex); - clearMotionHistory(pointerId); - break; - } - - case MotionEvent.ACTION_UP: - case MotionEvent.ACTION_CANCEL: { - cancel(); - break; - } - } - - return mDragState == STATE_DRAGGING; - } - - /** - * Process a touch event received by the parent view. This method will dispatch callback events - * as needed before returning. The parent view's onTouchEvent implementation should call this. - * - * @param ev The touch event received by the parent view - */ - public void processTouchEvent(MotionEvent ev) { - final int action = MotionEventCompat.getActionMasked(ev); - final int actionIndex = MotionEventCompat.getActionIndex(ev); - - if (action == MotionEvent.ACTION_DOWN) { - // Reset things for a new event stream, just in case we didn't get - // the whole previous stream. - cancel(); - } - - if (mVelocityTracker == null) { - mVelocityTracker = VelocityTracker.obtain(); - } - mVelocityTracker.addMovement(ev); - - switch (action) { - case MotionEvent.ACTION_DOWN: { - final float x = ev.getX(); - final float y = ev.getY(); - final int pointerId = MotionEventCompat.getPointerId(ev, 0); - final View toCapture = findTopChildUnder((int) x, (int) y); - - saveInitialMotion(x, y, pointerId); - - // Since the parent is already directly processing this touch event, - // there is no reason to delay for a slop before dragging. - // Start immediately if possible. - tryCaptureViewForDrag(toCapture, pointerId); - - final int edgesTouched = mInitialEdgesTouched[pointerId]; - if ((edgesTouched & mTrackingEdges) != 0) { - mCallback.onEdgeTouched(edgesTouched & mTrackingEdges, pointerId); - } - break; - } - - case MotionEventCompat.ACTION_POINTER_DOWN: { - final int pointerId = MotionEventCompat.getPointerId(ev, actionIndex); - final float x = MotionEventCompat.getX(ev, actionIndex); - final float y = MotionEventCompat.getY(ev, actionIndex); - - saveInitialMotion(x, y, pointerId); - - // A ViewDragHelper can only manipulate one view at a time. - if (mDragState == STATE_IDLE) { - // If we're idle we can do anything! Treat it like a normal down event. - - final View toCapture = findTopChildUnder((int) x, (int) y); - tryCaptureViewForDrag(toCapture, pointerId); - - final int edgesTouched = mInitialEdgesTouched[pointerId]; - if ((edgesTouched & mTrackingEdges) != 0) { - mCallback.onEdgeTouched(edgesTouched & mTrackingEdges, pointerId); - } - } else if (isCapturedViewUnder((int) x, (int) y)) { - // We're still tracking a captured view. If the same view is under this - // point, we'll swap to controlling it with this pointer instead. - // (This will still work if we're "catching" a settling view.) - - tryCaptureViewForDrag(mCapturedView, pointerId); - } - break; - } - - case MotionEvent.ACTION_MOVE: { - if (mDragState == STATE_DRAGGING) { - int index = MotionEventCompat.findPointerIndex(ev, mActivePointerId); - if (index < 0) { - Log.e(TAG, "Pointer index for id " + mActivePointerId + " not found." - + " Skipping MotionEvent"); - return; - } - final float x = MotionEventCompat.getX(ev, index); - final float y = MotionEventCompat.getY(ev, index); - final int idx = (int) (x - mLastMotionX[mActivePointerId]); - final int idy = (int) (y - mLastMotionY[mActivePointerId]); - - dragTo(mCapturedView.getLeft() + idx, mCapturedView.getTop() + idy, idx, idy); - - saveLastMotion(ev); - } else { - // Check to see if any pointer is now over a draggable view. - final int pointerCount = MotionEventCompat.getPointerCount(ev); - for (int i = 0; i < pointerCount; i++) { - final int pointerId = MotionEventCompat.getPointerId(ev, i); - final float x = MotionEventCompat.getX(ev, i); - final float y = MotionEventCompat.getY(ev, i); - final float dx = x - mInitialMotionX[pointerId]; - final float dy = y - mInitialMotionY[pointerId]; - - reportNewEdgeDrags(dx, dy, pointerId); - if (mDragState == STATE_DRAGGING) { - // Callback might have started an edge drag. - break; - } - - final View toCapture = findTopChildUnder((int) x, (int) y); - if (checkTouchSlop(toCapture, dx, dy) && - tryCaptureViewForDrag(toCapture, pointerId)) { - break; - } - } - saveLastMotion(ev); - } - break; - } - - case MotionEventCompat.ACTION_POINTER_UP: { - final int pointerId = MotionEventCompat.getPointerId(ev, actionIndex); - if (mDragState == STATE_DRAGGING && pointerId == mActivePointerId) { - // Try to find another pointer that's still holding on to the captured view. - int newActivePointer = INVALID_POINTER; - final int pointerCount = MotionEventCompat.getPointerCount(ev); - for (int i = 0; i < pointerCount; i++) { - final int id = MotionEventCompat.getPointerId(ev, i); - if (id == mActivePointerId) { - // This one's going away, skip. - continue; - } - - final float x = MotionEventCompat.getX(ev, i); - final float y = MotionEventCompat.getY(ev, i); - if (findTopChildUnder((int) x, (int) y) == mCapturedView && - tryCaptureViewForDrag(mCapturedView, id)) { - newActivePointer = mActivePointerId; - break; - } - } - - if (newActivePointer == INVALID_POINTER) { - // We didn't find another pointer still touching the view, release it. - releaseViewForPointerUp(); - } - } - clearMotionHistory(pointerId); - break; - } - - case MotionEvent.ACTION_UP: { - if (mDragState == STATE_DRAGGING) { - releaseViewForPointerUp(); - } - cancel(); - break; - } - - case MotionEvent.ACTION_CANCEL: { - if (mDragState == STATE_DRAGGING) { - dispatchViewReleased(0, 0); - } - cancel(); - break; - } - } - } - - private void reportNewEdgeDrags(float dx, float dy, int pointerId) { - int dragsStarted = 0; - if (checkNewEdgeDrag(dx, dy, pointerId, EDGE_LEFT)) { - dragsStarted |= EDGE_LEFT; - } - if (checkNewEdgeDrag(dy, dx, pointerId, EDGE_TOP)) { - dragsStarted |= EDGE_TOP; - } - if (checkNewEdgeDrag(dx, dy, pointerId, EDGE_RIGHT)) { - dragsStarted |= EDGE_RIGHT; - } - if (checkNewEdgeDrag(dy, dx, pointerId, EDGE_BOTTOM)) { - dragsStarted |= EDGE_BOTTOM; - } - - if (dragsStarted != 0) { - mEdgeDragsInProgress[pointerId] |= dragsStarted; - mCallback.onEdgeDragStarted(dragsStarted, pointerId); - } - } - - private boolean checkNewEdgeDrag(float delta, float odelta, int pointerId, int edge) { - final float absDelta = Math.abs(delta); - final float absODelta = Math.abs(odelta); - - if ((mInitialEdgesTouched[pointerId] & edge) != edge || (mTrackingEdges & edge) == 0 || - (mEdgeDragsLocked[pointerId] & edge) == edge || - (mEdgeDragsInProgress[pointerId] & edge) == edge || - (absDelta <= mTouchSlop && absODelta <= mTouchSlop)) { - return false; - } - if (absDelta < absODelta * 0.5f && mCallback.onEdgeLock(edge)) { - mEdgeDragsLocked[pointerId] |= edge; - return false; - } - return (mEdgeDragsInProgress[pointerId] & edge) == 0 && absDelta > mTouchSlop; - } - - /** - * Check if we've crossed a reasonable touch slop for the given child view. - * If the child cannot be dragged along the horizontal or vertical axis, motion - * along that axis will not count toward the slop check. - * - * @param child Child to check - * @param dx Motion since initial position along X axis - * @param dy Motion since initial position along Y axis - * @return true if the touch slop has been crossed - */ - private boolean checkTouchSlop(View child, float dx, float dy) { - if (child == null) { - return false; - } - final boolean checkHorizontal = mCallback.getViewHorizontalDragRange(child) > 0; - final boolean checkVertical = mCallback.getViewVerticalDragRange(child) > 0; - - if (checkHorizontal && checkVertical) { - return dx * dx + dy * dy > mTouchSlop * mTouchSlop; - } else if (checkHorizontal) { - return Math.abs(dx) > mTouchSlop; - } else if (checkVertical) { - return Math.abs(dy) > mTouchSlop; - } - return false; - } - - /** - * Check if any pointer tracked in the current gesture has crossed - * the required slop threshold. - * - * <p>This depends on internal state populated by - * {@link #shouldInterceptTouchEvent(android.view.MotionEvent)} or - * {@link #processTouchEvent(android.view.MotionEvent)}. You should only rely on - * the results of this method after all currently available touch data - * has been provided to one of these two methods.</p> - * - * @param directions Combination of direction flags, see {@link #DIRECTION_HORIZONTAL}, - * {@link #DIRECTION_VERTICAL}, {@link #DIRECTION_ALL} - * @return true if the slop threshold has been crossed, false otherwise - */ - public boolean checkTouchSlop(int directions) { - final int count = mInitialMotionX.length; - for (int i = 0; i < count; i++) { - if (checkTouchSlop(directions, i)) { - return true; - } - } - return false; - } - - /** - * Check if the specified pointer tracked in the current gesture has crossed - * the required slop threshold. - * - * <p>This depends on internal state populated by - * {@link #shouldInterceptTouchEvent(android.view.MotionEvent)} or - * {@link #processTouchEvent(android.view.MotionEvent)}. You should only rely on - * the results of this method after all currently available touch data - * has been provided to one of these two methods.</p> - * - * @param directions Combination of direction flags, see {@link #DIRECTION_HORIZONTAL}, - * {@link #DIRECTION_VERTICAL}, {@link #DIRECTION_ALL} - * @param pointerId ID of the pointer to slop check as specified by MotionEvent - * @return true if the slop threshold has been crossed, false otherwise - */ - public boolean checkTouchSlop(int directions, int pointerId) { - if (!isPointerDown(pointerId)) { - return false; - } - - final boolean checkHorizontal = (directions & DIRECTION_HORIZONTAL) == DIRECTION_HORIZONTAL; - final boolean checkVertical = (directions & DIRECTION_VERTICAL) == DIRECTION_VERTICAL; - - final float dx = mLastMotionX[pointerId] - mInitialMotionX[pointerId]; - final float dy = mLastMotionY[pointerId] - mInitialMotionY[pointerId]; - - if (checkHorizontal && checkVertical) { - return dx * dx + dy * dy > mTouchSlop * mTouchSlop; - } else if (checkHorizontal) { - return Math.abs(dx) > mTouchSlop; - } else if (checkVertical) { - return Math.abs(dy) > mTouchSlop; - } - return false; - } - - /** - * Check if any of the edges specified were initially touched in the currently active gesture. - * If there is no currently active gesture this method will return false. - * - * @param edges Edges to check for an initial edge touch. See {@link #EDGE_LEFT}, - * {@link #EDGE_TOP}, {@link #EDGE_RIGHT}, {@link #EDGE_BOTTOM} and - * {@link #EDGE_ALL} - * @return true if any of the edges specified were initially touched in the current gesture - */ - public boolean isEdgeTouched(int edges) { - final int count = mInitialEdgesTouched.length; - for (int i = 0; i < count; i++) { - if (isEdgeTouched(edges, i)) { - return true; - } - } - return false; - } - - /** - * Check if any of the edges specified were initially touched by the pointer with - * the specified ID. If there is no currently active gesture or if there is no pointer with - * the given ID currently down this method will return false. - * - * @param edges Edges to check for an initial edge touch. See {@link #EDGE_LEFT}, - * {@link #EDGE_TOP}, {@link #EDGE_RIGHT}, {@link #EDGE_BOTTOM} and - * {@link #EDGE_ALL} - * @return true if any of the edges specified were initially touched in the current gesture - */ - public boolean isEdgeTouched(int edges, int pointerId) { - return isPointerDown(pointerId) && (mInitialEdgesTouched[pointerId] & edges) != 0; - } - - private void releaseViewForPointerUp() { - mVelocityTracker.computeCurrentVelocity(1000, mMaxVelocity); - final float xvel = clampMag( - VelocityTrackerCompat.getXVelocity(mVelocityTracker, mActivePointerId), - mMinVelocity, mMaxVelocity); - final float yvel = clampMag( - VelocityTrackerCompat.getYVelocity(mVelocityTracker, mActivePointerId), - mMinVelocity, mMaxVelocity); - dispatchViewReleased(xvel, yvel); - } - - private void dragTo(int left, int top, int dx, int dy) { - int clampedX = left; - int clampedY = top; - final int oldLeft = mCapturedView.getLeft(); - final int oldTop = mCapturedView.getTop(); - if (dx != 0) { - clampedX = mCallback.clampViewPositionHorizontal(mCapturedView, left, dx); - mCapturedView.offsetLeftAndRight(clampedX - oldLeft); - } - if (dy != 0) { - clampedY = mCallback.clampViewPositionVertical(mCapturedView, top, dy); - mCapturedView.offsetTopAndBottom(clampedY - oldTop); - } - - if (dx != 0 || dy != 0) { - final int clampedDx = clampedX - oldLeft; - final int clampedDy = clampedY - oldTop; - mCallback.onViewPositionChanged(mCapturedView, clampedX, clampedY, - clampedDx, clampedDy); - } - } - - /** - * Determine if the currently captured view is under the given point in the - * parent view's coordinate system. If there is no captured view this method - * will return false. - * - * @param x X position to test in the parent's coordinate system - * @param y Y position to test in the parent's coordinate system - * @return true if the captured view is under the given point, false otherwise - */ - public boolean isCapturedViewUnder(int x, int y) { - return isViewUnder(mCapturedView, x, y); - } - - /** - * Determine if the supplied view is under the given point in the - * parent view's coordinate system. - * - * @param view Child view of the parent to hit test - * @param x X position to test in the parent's coordinate system - * @param y Y position to test in the parent's coordinate system - * @return true if the supplied view is under the given point, false otherwise - */ - public boolean isViewUnder(View view, int x, int y) { - if (view == null) { - return false; - } - return x >= view.getLeft() && - x < view.getRight() && - y >= view.getTop() && - y < view.getBottom(); - } - - /** - * Find the topmost child under the given point within the parent view's coordinate system. - * The child order is determined using {@link Callback#getOrderedChildIndex(int)}. - * - * @param x X position to test in the parent's coordinate system - * @param y Y position to test in the parent's coordinate system - * @return The topmost child view under (x, y) or null if none found. - */ - public View findTopChildUnder(int x, int y) { - final int childCount = mParentView.getChildCount(); - for (int i = childCount - 1; i >= 0; i--) { - final View child = mParentView.getChildAt(mCallback.getOrderedChildIndex(i)); - if (x >= child.getLeft() && x < child.getRight() && - y >= child.getTop() && y < child.getBottom()) { - return child; - } - } - return null; - } - - private int getEdgesTouched(int x, int y) { - int result = 0; - - if (x < mParentView.getLeft() + mEdgeSize) result |= EDGE_LEFT; - if (y < mParentView.getTop() + mEdgeSize) result |= EDGE_TOP; - if (x > mParentView.getRight() - mEdgeSize) result |= EDGE_RIGHT; - if (y > mParentView.getBottom() - mEdgeSize) result |= EDGE_BOTTOM; - - return result; - } - - /** - * Prepares the {@link ViewDragHelper} for the beginning of a nested scroll. - * - * @param target The child view that is dispatching the nested scroll. - */ - public void startNestedScroll(View target) { - if (mVelocityTracker == null) { - mVelocityTracker = VelocityTracker.obtain(); - } - setDragState(STATE_DRAGGING); - mCapturedView = target; - } - - /** - * Informs the {@link ViewDragHelper} that a nested scroll has ended. - * - * @param target The child view that is dispatching the nested scroll. - */ - public void stopNestedScroll(View target) { - mCapturedView = target; - dispatchViewReleased(0, 0); - } - - /** - * Update the {@link ViewDragHelper} with a new nested scrolling event. - * - * @param target The child view that is dispatching the nested scroll. - * @param dx The x distance scrolled on the child, in pixels. - * @param dy The y distance scroll on the child, in pixels. - * @param consumed An int array for the {@link ViewDragHelper} to report back the scroll - * deltas that it consumed. - */ - public void processNestedScroll(View target, int dx, int dy, int[] consumed) { - if (mCapturedView == null) { - // This is safe because consumed array is null when called from - // onNestedScroll, and pre-initialized to {0, 0} when called from - // onNestedPreScroll. - return; - } - final int targetX = mCapturedView.getLeft() + dx; - final int targetY = mCapturedView.getTop() + dy; - dragTo(targetX, targetY, dx, dy); - if (consumed != null) { - final int unconsumedX = targetX - mCapturedView.getLeft(); - final int unconsumedY = targetY - mCapturedView.getTop(); - consumed[0] = unconsumedX - dx; - consumed[1] = unconsumedY - dy; - } - } - -} |