| /* |
| * 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; |
| |
| import static com.android.launcher3.LauncherAnimUtils.OVERVIEW_TRANSITION_MS; |
| import static com.android.launcher3.LauncherState.NORMAL; |
| import static com.android.launcher3.LauncherState.OVERVIEW; |
| |
| import android.animation.Animator; |
| import android.animation.AnimatorListenerAdapter; |
| import android.view.MotionEvent; |
| import android.view.ScaleGestureDetector; |
| import android.view.ScaleGestureDetector.OnScaleGestureListener; |
| |
| import com.android.launcher3.compat.AnimatorSetCompat; |
| import com.android.launcher3.util.TouchController; |
| |
| /** |
| * Detects pinches and animates the Workspace to/from overview mode. |
| */ |
| public class PinchToOverviewListener |
| implements TouchController, OnScaleGestureListener, Runnable { |
| |
| private static final float ACCEPT_THRESHOLD = 0.65f; |
| /** |
| * The velocity threshold at which a pinch will be completed instead of canceled, |
| * even if the first threshold has not been passed. Measured in scale / millisecond |
| */ |
| private static final float FLING_VELOCITY = 0.001f; |
| |
| private final ScaleGestureDetector mPinchDetector; |
| private Launcher mLauncher; |
| private Workspace mWorkspace = null; |
| private boolean mPinchStarted = false; |
| |
| private AnimatorSetCompat mCurrentAnimation; |
| private float mCurrentScale; |
| private boolean mShouldGoToFinalState; |
| |
| private LauncherState mToState; |
| |
| public PinchToOverviewListener(Launcher launcher) { |
| mLauncher = launcher; |
| mPinchDetector = new ScaleGestureDetector(mLauncher, this); |
| } |
| |
| public boolean onControllerInterceptTouchEvent(MotionEvent ev) { |
| mPinchDetector.onTouchEvent(ev); |
| return mPinchStarted; |
| } |
| |
| public boolean onControllerTouchEvent(MotionEvent ev) { |
| return mPinchDetector.onTouchEvent(ev); |
| } |
| |
| @Override |
| public boolean onScaleBegin(ScaleGestureDetector detector) { |
| if (!mLauncher.isInState(NORMAL) |
| && !mLauncher.isInState(OVERVIEW)) { |
| // Don't listen for the pinch gesture if on all apps, widget picker, -1, etc. |
| return false; |
| } |
| if (mCurrentAnimation != null) { |
| // Don't listen for the pinch gesture if we are already animating from a previous one. |
| return false; |
| } |
| if (mLauncher.isWorkspaceLocked()) { |
| // Don't listen for the pinch gesture if the workspace isn't ready. |
| return false; |
| } |
| if (mWorkspace == null) { |
| mWorkspace = mLauncher.getWorkspace(); |
| } |
| if (mWorkspace.isSwitchingState() || mWorkspace.mScrollInteractionBegan) { |
| // Don't listen for the pinch gesture while switching state, as it will cause a jump |
| // once the state switching animation is complete. |
| return false; |
| } |
| if (AbstractFloatingView.getTopOpenView(mLauncher) != null) { |
| // Don't listen for the pinch gesture if a floating view is open. |
| return false; |
| } |
| |
| if (mLauncher.getDragController().isDragging()) { |
| mLauncher.getDragController().cancelDrag(); |
| } |
| |
| mToState = mLauncher.isInState(OVERVIEW) ? NORMAL : OVERVIEW; |
| mCurrentAnimation = AnimatorSetCompat.wrap(mLauncher.getStateManager() |
| .createAnimationToNewWorkspace(mToState, this), OVERVIEW_TRANSITION_MS); |
| mPinchStarted = true; |
| mCurrentScale = 1; |
| mShouldGoToFinalState = false; |
| |
| mCurrentAnimation.dispatchOnStart(); |
| return true; |
| } |
| |
| @Override |
| public void run() { |
| mCurrentAnimation = null; |
| mPinchStarted = false; |
| } |
| |
| @Override |
| public void onScaleEnd(ScaleGestureDetector detector) { |
| if (mShouldGoToFinalState) { |
| mCurrentAnimation.start(); |
| } else { |
| mCurrentAnimation.addListener(new AnimatorListenerAdapter() { |
| @Override |
| public void onAnimationEnd(Animator animation) { |
| mLauncher.getStateManager().goToState( |
| mToState == OVERVIEW ? NORMAL : OVERVIEW, false); |
| } |
| }); |
| mCurrentAnimation.reverse(); |
| } |
| } |
| |
| @Override |
| public boolean onScale(ScaleGestureDetector detector) { |
| mCurrentScale = detector.getScaleFactor() * mCurrentScale; |
| |
| // If we are zooming out, inverse the mCurrentScale so that animationFraction = [0, 1] |
| // 0 => Animation complete |
| // 1=> Animation started |
| float animationFraction = mToState == OVERVIEW ? mCurrentScale : (1 / mCurrentScale); |
| |
| float velocity = (1 - detector.getScaleFactor()) / detector.getTimeDelta(); |
| if (Math.abs(velocity) >= FLING_VELOCITY) { |
| LauncherState toState = velocity > 0 ? OVERVIEW : NORMAL; |
| mShouldGoToFinalState = toState == mToState; |
| } else { |
| mShouldGoToFinalState = animationFraction <= ACCEPT_THRESHOLD; |
| } |
| |
| // Move the transition animation to that duration. |
| mCurrentAnimation.setPlayFraction(1 - animationFraction); |
| return true; |
| } |
| } |