Sunny Goyal
9b18010990
> Removing some special checks around accessibility drag > Unifying folder alarm code path for accessible and normal DnD > Maintaining mDragStartTime inside the dragDriver instead of the callers > Simplifying some accessibility callbacks Future cl will create a Accessibility DragDriver and unify it with other DnD flow Change-Id: I1919ef218de0174678110f271b450bcb9aaf4a5c
112 lines
4.1 KiB
Java
112 lines
4.1 KiB
Java
/*
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* Copyright (C) 2016 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.launcher3.dragndrop;
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import android.graphics.PointF;
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import android.view.MotionEvent;
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import android.view.VelocityTracker;
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import android.view.ViewConfiguration;
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import com.android.launcher3.ButtonDropTarget;
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import com.android.launcher3.DropTarget;
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import com.android.launcher3.Launcher;
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import com.android.launcher3.R;
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import com.android.launcher3.util.FlingAnimation;
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/**
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* Utility class to manage fling to delete action during drag and drop.
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*/
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public class FlingToDeleteHelper {
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private static final float MAX_FLING_DEGREES = 35f;
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private final Launcher mLauncher;
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private final int mFlingToDeleteThresholdVelocity;
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private ButtonDropTarget mDropTarget;
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private VelocityTracker mVelocityTracker;
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public FlingToDeleteHelper(Launcher launcher) {
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mLauncher = launcher;
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mFlingToDeleteThresholdVelocity = launcher.getResources()
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.getDimensionPixelSize(R.dimen.drag_flingToDeleteMinVelocity);
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}
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public void recordMotionEvent(MotionEvent ev) {
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if (mVelocityTracker == null) {
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mVelocityTracker = VelocityTracker.obtain();
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}
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mVelocityTracker.addMovement(ev);
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}
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public void releaseVelocityTracker() {
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if (mVelocityTracker != null) {
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mVelocityTracker.recycle();
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mVelocityTracker = null;
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}
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}
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public DropTarget getDropTarget() {
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return mDropTarget;
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}
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public Runnable getFlingAnimation(DropTarget.DragObject dragObject, DragOptions options) {
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PointF vel = isFlingingToDelete();
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options.isFlingToDelete = vel != null;
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if (!options.isFlingToDelete) {
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return null;
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}
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return new FlingAnimation(dragObject, vel, mDropTarget, mLauncher, options);
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}
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/**
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* Determines whether the user flung the current item to delete it.
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*
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* @return the vector at which the item was flung, or null if no fling was detected.
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*/
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private PointF isFlingingToDelete() {
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if (mVelocityTracker == null) return null;
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if (mDropTarget == null) {
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mDropTarget = (ButtonDropTarget) mLauncher.findViewById(R.id.delete_target_text);
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}
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if (mDropTarget == null || !mDropTarget.isDropEnabled()) return null;
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ViewConfiguration config = ViewConfiguration.get(mLauncher);
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mVelocityTracker.computeCurrentVelocity(1000, config.getScaledMaximumFlingVelocity());
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PointF vel = new PointF(mVelocityTracker.getXVelocity(), mVelocityTracker.getYVelocity());
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float theta = MAX_FLING_DEGREES + 1;
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if (mVelocityTracker.getYVelocity() < mFlingToDeleteThresholdVelocity) {
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// Do a quick dot product test to ensure that we are flinging upwards
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PointF upVec = new PointF(0f, -1f);
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theta = getAngleBetweenVectors(vel, upVec);
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} else if (mLauncher.getDeviceProfile().isVerticalBarLayout() &&
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mVelocityTracker.getXVelocity() < mFlingToDeleteThresholdVelocity) {
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// Remove icon is on left side instead of top, so check if we are flinging to the left.
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PointF leftVec = new PointF(-1f, 0f);
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theta = getAngleBetweenVectors(vel, leftVec);
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}
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if (theta <= Math.toRadians(MAX_FLING_DEGREES)) {
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return vel;
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}
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return null;
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}
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private float getAngleBetweenVectors(PointF vec1, PointF vec2) {
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return (float) Math.acos(((vec1.x * vec2.x) + (vec1.y * vec2.y)) /
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(vec1.length() * vec2.length()));
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}
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}
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