| package com.android.launcher3.shortcuts; |
| |
| import android.os.SystemClock; |
| import android.view.MotionEvent; |
| import android.view.View; |
| import android.view.ViewConfiguration; |
| |
| import com.android.launcher3.BubbleTextView; |
| import com.android.launcher3.CheckLongPressHelper; |
| import com.android.launcher3.Launcher; |
| import com.android.launcher3.Utilities; |
| import com.android.launcher3.dragndrop.DragLayer; |
| |
| /** |
| * A {@link android.view.View.OnTouchListener} that creates a {@link DeepShortcutsContainer} and |
| * forwards touch events to it. This listener should be put on any icon that supports shortcuts. |
| */ |
| public class ShortcutsContainerListener implements View.OnTouchListener, |
| View.OnAttachStateChangeListener { |
| |
| /** Scaled touch slop, used for detecting movement outside bounds. */ |
| private final float mScaledTouchSlop; |
| |
| /** Timeout before accepting a long-press to start forwarding. */ |
| private final int mLongPressTimeout; |
| |
| /** Source view from which events are forwarded. */ |
| private final BubbleTextView mSrcIcon; |
| |
| /** Runnable used to trigger forwarding on long-press. */ |
| private Runnable mTriggerLongPress; |
| |
| /** Whether this listener is currently forwarding touch events. */ |
| private boolean mForwarding; |
| |
| /** The id of the first pointer down in the current event stream. */ |
| private int mActivePointerId; |
| |
| private Launcher mLauncher; |
| private DragLayer mDragLayer; |
| /** The coordinates of the touch down, relative to the shortcuts container. */ |
| private final int[] mTouchDown; |
| private boolean mHasMappedTouchDownToContainerCoord; |
| |
| /** If true, the gesture is not handled. The value is reset when next gesture starts. */ |
| private boolean mIgnoreCurrentGesture; |
| private DeepShortcutsContainer mShortcutsContainer; |
| |
| public ShortcutsContainerListener(BubbleTextView icon) { |
| mSrcIcon = icon; |
| mScaledTouchSlop = ViewConfiguration.get(icon.getContext()).getScaledTouchSlop(); |
| |
| mLongPressTimeout = CheckLongPressHelper.DEFAULT_LONG_PRESS_TIMEOUT; |
| |
| icon.addOnAttachStateChangeListener(this); |
| |
| mLauncher = Launcher.getLauncher(mSrcIcon.getContext()); |
| mDragLayer = mLauncher.getDragLayer(); |
| mTouchDown = new int[2]; |
| } |
| |
| @Override |
| public boolean onTouch(View v, MotionEvent event) { |
| if (event.getAction() == MotionEvent.ACTION_DOWN) { |
| // There are no shortcuts associated with this item, |
| // so return to normal touch handling. |
| mIgnoreCurrentGesture = !mSrcIcon.hasDeepShortcuts(); |
| |
| mTouchDown[0] = (int) event.getX(); |
| mTouchDown[1] = (int) event.getY(); |
| mDragLayer.getDescendantCoordRelativeToSelf(mSrcIcon, mTouchDown); |
| mHasMappedTouchDownToContainerCoord = false; |
| } |
| |
| if (mIgnoreCurrentGesture) { |
| return false; |
| } |
| |
| final boolean wasForwarding = mForwarding; |
| final boolean forwarding; |
| if (wasForwarding) { |
| forwarding = onTouchForwarded(event) || !onForwardingStopped(); |
| } else { |
| forwarding = onTouchObserved(event) && onForwardingStarted(); |
| |
| if (forwarding) { |
| // Make sure we cancel any ongoing source event stream. |
| final long now = SystemClock.uptimeMillis(); |
| final MotionEvent e = MotionEvent.obtain(now, now, MotionEvent.ACTION_CANCEL, |
| 0.0f, 0.0f, 0); |
| mSrcIcon.onTouchEvent(e); |
| e.recycle(); |
| } |
| } |
| |
| mForwarding = forwarding; |
| return forwarding || wasForwarding; |
| } |
| |
| @Override |
| public void onViewAttachedToWindow(View v) { |
| } |
| |
| @Override |
| public void onViewDetachedFromWindow(View v) { |
| mForwarding = false; |
| mActivePointerId = MotionEvent.INVALID_POINTER_ID; |
| } |
| |
| /** |
| * Called when forwarding would like to start. |
| * <p> |
| * This is when we populate the shortcuts container and add it to the DragLayer. |
| * |
| * @return true to start forwarding, false otherwise |
| */ |
| protected boolean onForwardingStarted() { |
| mShortcutsContainer = DeepShortcutsContainer.showForIcon(mSrcIcon); |
| return mShortcutsContainer != null; |
| } |
| |
| /** |
| * Called when forwarding would like to stop. |
| * |
| * @return true to stop forwarding, false otherwise |
| */ |
| protected boolean onForwardingStopped() { |
| mShortcutsContainer = null; |
| return true; |
| } |
| |
| /** |
| * Observes motion events and determines when to start forwarding. |
| * |
| * @param srcEvent motion event in source view coordinates |
| * @return true to start forwarding motion events, false otherwise |
| */ |
| private boolean onTouchObserved(MotionEvent srcEvent) { |
| final View src = mSrcIcon; |
| if (!src.isEnabled()) { |
| return false; |
| } |
| |
| final int actionMasked = srcEvent.getActionMasked(); |
| switch (actionMasked) { |
| case MotionEvent.ACTION_DOWN: |
| mActivePointerId = srcEvent.getPointerId(0); |
| |
| if (mTriggerLongPress == null) { |
| mTriggerLongPress = new TriggerLongPress(); |
| } |
| src.postDelayed(mTriggerLongPress, mLongPressTimeout); |
| break; |
| case MotionEvent.ACTION_MOVE: |
| final int activePointerIndex = srcEvent.findPointerIndex(mActivePointerId); |
| if (activePointerIndex >= 0) { |
| final float x = srcEvent.getX(activePointerIndex); |
| final float y = srcEvent.getY(activePointerIndex); |
| |
| // Has the pointer moved outside of the view? |
| if (!Utilities.pointInView(src, x, y, mScaledTouchSlop)) { |
| clearCallbacks(); |
| |
| return false; |
| } |
| } |
| break; |
| case MotionEvent.ACTION_CANCEL: |
| case MotionEvent.ACTION_UP: |
| clearCallbacks(); |
| break; |
| } |
| |
| return false; |
| } |
| |
| private void clearCallbacks() { |
| if (mTriggerLongPress != null) { |
| mSrcIcon.removeCallbacks(mTriggerLongPress); |
| } |
| } |
| |
| private void onLongPress() { |
| clearCallbacks(); |
| |
| final BubbleTextView src = mSrcIcon; |
| if (!src.isEnabled() || !src.hasDeepShortcuts()) { |
| // Ignore long-press if the view is disabled or doesn't have shortcuts. |
| return; |
| } |
| |
| if (!onForwardingStarted()) { |
| return; |
| } |
| |
| // Don't let the parent intercept our events. |
| src.getParent().requestDisallowInterceptTouchEvent(true); |
| |
| // Make sure we cancel any ongoing source event stream. |
| final long now = SystemClock.uptimeMillis(); |
| final MotionEvent e = MotionEvent.obtain(now, now, MotionEvent.ACTION_CANCEL, 0, 0, 0); |
| src.onTouchEvent(e); |
| e.recycle(); |
| |
| mForwarding = true; |
| } |
| |
| /** |
| * Handles forwarded motion events and determines when to stop |
| * forwarding. |
| * |
| * @param srcEvent motion event in source view coordinates |
| * @return true to continue forwarding motion events, false to cancel |
| */ |
| private boolean onTouchForwarded(MotionEvent srcEvent) { |
| final View src = mSrcIcon; |
| final DeepShortcutsContainer dst = mShortcutsContainer; |
| if (dst == null) { |
| return false; |
| } |
| if (!dst.isLaidOut()) { |
| return true; |
| } |
| |
| // Convert event to destination-local coordinates. |
| final MotionEvent dstEvent = MotionEvent.obtainNoHistory(srcEvent); |
| Utilities.translateEventCoordinates(src, dst, dstEvent); |
| |
| // Convert touch down event to destination-local coordinates. |
| if (!mHasMappedTouchDownToContainerCoord) { |
| mDragLayer.mapCoordInSelfToDescendent(dst, mTouchDown); |
| mHasMappedTouchDownToContainerCoord = true; |
| } |
| |
| // Forward converted event to destination view, then recycle it. |
| final boolean handled = dst.onForwardedEvent(dstEvent, mActivePointerId, mTouchDown); |
| dstEvent.recycle(); |
| |
| // Always cancel forwarding when the touch stream ends. |
| final int action = srcEvent.getActionMasked(); |
| final boolean keepForwarding = action != MotionEvent.ACTION_UP |
| && action != MotionEvent.ACTION_CANCEL; |
| |
| return handled && keepForwarding; |
| } |
| |
| private class TriggerLongPress implements Runnable { |
| @Override |
| public void run() { |
| onLongPress(); |
| } |
| } |
| } |