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Animate taskbar background alpha and visibility alpha

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Setup codepath to animate the Taskbar when going to and from Launcher,
primarily by listening for pause/resume signals but also hints from
gesture nav and AppToOverviewAnimationProvider.

Additionally, add TaskbarStateHandler to listen for Launcher state
changes if Taskbar is enabled. Combined, the end behavior is:

- Background alpha is 0 when Launcher is resumed, and 1 when Launcher
  is paused (we can make this animation more interesting later).
- Taskbar is always visible when Launcher is paused, otherwise its
  visibility is determined by multiple factors: LauncherState and
  whether the IME is showing.

Bug: 171917176
Change-Id: I7856fc979931c9d12d714dee11d179fd1b5a6968
This commit is contained in:
Tony Wickham
2020-12-23 16:12:18 -06:00
parent d462965698
commit d683d98b34
18 changed files with 392 additions and 11 deletions
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77
quickstep/src/com/android/launcher3/taskbar/TaskbarStateHandler.java Normal file
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/*
* Copyright (C) 2021 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.taskbar;
import static com.android.launcher3.LauncherState.TASKBAR;
import static com.android.launcher3.states.StateAnimationConfig.ANIM_TASKBAR_FADE;
import static com.android.launcher3.states.StateAnimationConfig.SKIP_TASKBAR;
import androidx.annotation.Nullable;
import com.android.launcher3.BaseQuickstepLauncher;
import com.android.launcher3.LauncherState;
import com.android.launcher3.anim.Interpolators;
import com.android.launcher3.anim.PendingAnimation;
import com.android.launcher3.statemanager.StateManager;
import com.android.launcher3.states.StateAnimationConfig;
import com.android.quickstep.AnimatedFloat;
/**
* StateHandler to animate Taskbar according to Launcher's state machine. Does nothing if Taskbar
* isn't present (i.e. {@link #setTaskbarCallbacks} is never called).
*/
public class TaskbarStateHandler implements StateManager.StateHandler<LauncherState> {
private final BaseQuickstepLauncher mLauncher;
// Contains Taskbar-related methods and fields we should aniamte. If null, don't do anything.
private @Nullable TaskbarController.TaskbarStateHandlerCallbacks mTaskbarCallbacks = null;
public TaskbarStateHandler(BaseQuickstepLauncher launcher) {
mLauncher = launcher;
}
public void setTaskbarCallbacks(TaskbarController.TaskbarStateHandlerCallbacks callbacks) {
mTaskbarCallbacks = callbacks;
}
@Override
public void setState(LauncherState state) {
if (mTaskbarCallbacks == null) {
return;
}
AnimatedFloat alphaTarget = mTaskbarCallbacks.getAlphaTarget();
boolean isTaskbarVisible = (state.getVisibleElements(mLauncher) & TASKBAR) != 0;
alphaTarget.updateValue(isTaskbarVisible ? 1f : 0f);
}
@Override
public void setStateWithAnimation(LauncherState toState, StateAnimationConfig config,
PendingAnimation animation) {
if (mTaskbarCallbacks == null) {
return;
}
if (config.hasAnimationFlag(SKIP_TASKBAR)) {
return;
}
AnimatedFloat alphaTarget = mTaskbarCallbacks.getAlphaTarget();
boolean isTaskbarVisible = (toState.getVisibleElements(mLauncher) & TASKBAR) != 0;
animation.setFloat(alphaTarget, AnimatedFloat.VALUE, isTaskbarVisible ? 1f : 0f,
config.getInterpolator(ANIM_TASKBAR_FADE, Interpolators.LINEAR));
}
}