diff options
Diffstat (limited to 'quickstep/src/com/android/launcher3/uioverrides/BackButtonAlphaHandler.java')
-rw-r--r-- | quickstep/src/com/android/launcher3/uioverrides/BackButtonAlphaHandler.java | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/quickstep/src/com/android/launcher3/uioverrides/BackButtonAlphaHandler.java b/quickstep/src/com/android/launcher3/uioverrides/BackButtonAlphaHandler.java new file mode 100644 index 000000000..2e6dcc0e7 --- /dev/null +++ b/quickstep/src/com/android/launcher3/uioverrides/BackButtonAlphaHandler.java @@ -0,0 +1,62 @@ +/* + * Copyright (C) 2018 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.uioverrides; + +import android.animation.ValueAnimator; + +import com.android.launcher3.Launcher; +import com.android.launcher3.LauncherState; +import com.android.launcher3.LauncherStateManager; +import com.android.launcher3.anim.AnimatorSetBuilder; +import com.android.quickstep.OverviewInteractionState; + +public class BackButtonAlphaHandler implements LauncherStateManager.StateHandler { + + private static final String TAG = "BackButtonAlphaHandler"; + + private final Launcher mLauncher; + private final OverviewInteractionState mOverviewInteractionState; + + public BackButtonAlphaHandler(Launcher launcher) { + mLauncher = launcher; + mOverviewInteractionState = OverviewInteractionState.getInstance(mLauncher); + } + + @Override + public void setState(LauncherState state) { + UiFactory.onLauncherStateOrFocusChanged(mLauncher); + } + + @Override + public void setStateWithAnimation(LauncherState toState, + AnimatorSetBuilder builder, LauncherStateManager.AnimationConfig config) { + if (!config.playNonAtomicComponent()) { + return; + } + float fromAlpha = mOverviewInteractionState.getBackButtonAlpha(); + float toAlpha = toState.hideBackButton ? 0 : 1; + if (Float.compare(fromAlpha, toAlpha) != 0) { + ValueAnimator anim = ValueAnimator.ofFloat(fromAlpha, toAlpha); + anim.setDuration(config.duration); + anim.addUpdateListener(valueAnimator -> { + final float alpha = (float) valueAnimator.getAnimatedValue(); + mOverviewInteractionState.setBackButtonAlpha(alpha, false); + }); + builder.play(anim); + } + } +} |