diff options
Diffstat (limited to 'src/com/android/launcher3/util')
-rw-r--r-- | src/com/android/launcher3/util/TransformingTouchDelegate.java | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/src/com/android/launcher3/util/TransformingTouchDelegate.java b/src/com/android/launcher3/util/TransformingTouchDelegate.java new file mode 100644 index 000000000..da1de5e77 --- /dev/null +++ b/src/com/android/launcher3/util/TransformingTouchDelegate.java @@ -0,0 +1,87 @@ +/* + * Copyright (C) 2016 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.launcher3.util; + +import android.graphics.Rect; +import android.graphics.RectF; +import android.view.MotionEvent; +import android.view.TouchDelegate; +import android.view.View; + +/** + * This class differs from the framework {@link TouchDelegate} in that it transforms the + * coordinates of the motion event to the provided bounds. + * + * You can also modify the bounds post construction. Since the bounds are available during layout, + * this avoids new object creation during every layout. + */ +public class TransformingTouchDelegate extends TouchDelegate { + private static final Rect sTempRect = new Rect(); + + private final RectF mBounds; + + private View mDelegateView; + private boolean mDelegateTargeted; + + public TransformingTouchDelegate(View delegateView) { + super(sTempRect, delegateView); + + mDelegateView = delegateView; + mBounds = new RectF(); + } + + public void setBounds(int left, int top, int right, int bottom) { + mBounds.set(left, top, right, bottom); + } + + public void setDelegateView(View view) { + mDelegateView = view; + } + + /** + * Will forward touch events to the delegate view if the event is within the bounds + * specified in the constructor. + * + * @param event The touch event to forward + * @return True if the event was forwarded to the delegate, false otherwise. + */ + public boolean onTouchEvent(MotionEvent event) { + boolean sendToDelegate = false; + switch (event.getAction()) { + case MotionEvent.ACTION_DOWN: + mDelegateTargeted = mBounds.contains(event.getX(), event.getY()); + if (mDelegateTargeted) { + sendToDelegate = true; + } + break; + case MotionEvent.ACTION_MOVE: + sendToDelegate = mDelegateTargeted; + break; + case MotionEvent.ACTION_UP: + case MotionEvent.ACTION_CANCEL: + sendToDelegate = mDelegateTargeted; + mDelegateTargeted = false; + break; + } + boolean handled = false; + if (sendToDelegate) { + event.offsetLocation(-mBounds.left, -mBounds.top); + handled = mDelegateView.dispatchTouchEvent(event); + event.offsetLocation(mBounds.left, mBounds.top); + } + return handled; + } +} |