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/*
* Copyright (C) 2015 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.DRAWABLE_ALPHA;
import static com.android.launcher3.LauncherAnimUtils.SCALE_PROPERTY;
import static com.android.launcher3.compat.AccessibilityManagerCompat.isAccessibilityEnabled;
import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.animation.ObjectAnimator;
import android.animation.TimeInterpolator;
import android.animation.ValueAnimator;
import android.util.Property;
import android.view.View;
import com.android.launcher3.LauncherState.PageAlphaProvider;
import com.android.launcher3.LauncherStateManager.AnimationConfig;
import com.android.launcher3.anim.AnimatorSetBuilder;
import com.android.launcher3.anim.Interpolators;
import com.android.launcher3.graphics.ViewScrim;
/**
* A convenience class to update a view's visibility state after an alpha animation.
*/
class AlphaUpdateListener extends AnimatorListenerAdapter implements ValueAnimator.AnimatorUpdateListener {
private static final float ALPHA_CUTOFF_THRESHOLD = 0.01f;
private View mView;
private boolean mAccessibilityEnabled;
private boolean mCanceled = false;
public AlphaUpdateListener(View v, boolean accessibilityEnabled) {
mView = v;
mAccessibilityEnabled = accessibilityEnabled;
}
@Override
public void onAnimationUpdate(ValueAnimator arg0) {
updateVisibility(mView, mAccessibilityEnabled);
}
public static void updateVisibility(View view, boolean accessibilityEnabled) {
// We want to avoid the extra layout pass by setting the views to GONE unless
// accessibility is on, in which case not setting them to GONE causes a glitch.
int invisibleState = accessibilityEnabled ? View.GONE : View.INVISIBLE;
if (view.getAlpha() < ALPHA_CUTOFF_THRESHOLD && view.getVisibility() != invisibleState) {
view.setVisibility(invisibleState);
} else if (view.getAlpha() > ALPHA_CUTOFF_THRESHOLD
&& view.getVisibility() != View.VISIBLE) {
view.setVisibility(View.VISIBLE);
}
}
@Override
public void onAnimationCancel(Animator animation) {
mCanceled = true;
}
@Override
public void onAnimationEnd(Animator arg0) {
if (mCanceled) return;
updateVisibility(mView, mAccessibilityEnabled);
}
@Override
public void onAnimationStart(Animator arg0) {
// We want the views to be visible for animation, so fade-in/out is visible
mView.setVisibility(View.VISIBLE);
}
}
/**
* Manages the animations between each of the workspace states.
*/
public class WorkspaceStateTransitionAnimation {
public static final PropertySetter NO_ANIM_PROPERTY_SETTER = new PropertySetter();
private final Launcher mLauncher;
private final Workspace mWorkspace;
private float mNewScale;
public WorkspaceStateTransitionAnimation(Launcher launcher, Workspace workspace) {
mLauncher = launcher;
mWorkspace = workspace;
}
public void setState(LauncherState toState) {
setWorkspaceProperty(toState, NO_ANIM_PROPERTY_SETTER);
}
public void setStateWithAnimation(LauncherState toState, AnimatorSetBuilder builder,
AnimationConfig config) {
AnimatedPropertySetter propertySetter =
new AnimatedPropertySetter(config.duration, builder);
setWorkspaceProperty(toState, propertySetter);
}
public float getFinalScale() {
return mNewScale;
}
/**
* Starts a transition animation for the workspace.
*/
private void setWorkspaceProperty(LauncherState state, PropertySetter propertySetter) {
float[] scaleAndTranslation = state.getWorkspaceScaleAndTranslation(mLauncher);
mNewScale = scaleAndTranslation[0];
PageAlphaProvider pageAlphaProvider = state.getWorkspacePageAlphaProvider(mLauncher);
final int childCount = mWorkspace.getChildCount();
for (int i = 0; i < childCount; i++) {
applyChildState(state, (CellLayout) mWorkspace.getChildAt(i), i, pageAlphaProvider,
propertySetter);
}
propertySetter.setFloat(mWorkspace, SCALE_PROPERTY, mNewScale, Interpolators.ZOOM_IN);
propertySetter.setFloat(mWorkspace, View.TRANSLATION_X,
scaleAndTranslation[1], Interpolators.ZOOM_IN);
propertySetter.setFloat(mWorkspace, View.TRANSLATION_Y,
scaleAndTranslation[2], Interpolators.ZOOM_IN);
propertySetter.setViewAlpha(mLauncher.getHotseat(), state.getHoseatAlpha(mLauncher),
pageAlphaProvider.interpolator);
propertySetter.setViewAlpha(mLauncher.getWorkspace().getPageIndicator(),
state.getHoseatAlpha(mLauncher), pageAlphaProvider.interpolator);
// Set scrim
propertySetter.setFloat(ViewScrim.get(mWorkspace), ViewScrim.PROGRESS,
state.hasScrim ? 1 : 0, Interpolators.LINEAR);
propertySetter.setFloat(ViewScrim.get(mLauncher.getAppsView()), ViewScrim.PROGRESS,
state.hasAllAppsScrim ? 1 : 0, Interpolators.LINEAR);
}
public void applyChildState(LauncherState state, CellLayout cl, int childIndex) {
applyChildState(state, cl, childIndex, state.getWorkspacePageAlphaProvider(mLauncher),
NO_ANIM_PROPERTY_SETTER);
}
private void applyChildState(LauncherState state, CellLayout cl, int childIndex,
PageAlphaProvider pageAlphaProvider, PropertySetter propertySetter) {
float pageAlpha = pageAlphaProvider.getPageAlpha(childIndex);
int drawableAlpha = Math.round(pageAlpha * (state.hasWorkspacePageBackground ? 255 : 0));
propertySetter.setInt(cl.getScrimBackground(),
DRAWABLE_ALPHA, drawableAlpha, Interpolators.ZOOM_IN);
propertySetter.setFloat(cl.getShortcutsAndWidgets(), View.ALPHA,
pageAlpha, pageAlphaProvider.interpolator);
}
public static class PropertySetter {
public void setViewAlpha(View view, float alpha, TimeInterpolator interpolator) {
view.setAlpha(alpha);
AlphaUpdateListener.updateVisibility(view, isAccessibilityEnabled(view.getContext()));
}
public <T> void setFloat(T target, Property<T, Float> property, float value,
TimeInterpolator interpolator) {
property.set(target, value);
}
public <T> void setInt(T target, Property<T, Integer> property, int value,
TimeInterpolator interpolator) {
property.set(target, value);
}
}
public static class AnimatedPropertySetter extends PropertySetter {
private final long mDuration;
private final AnimatorSetBuilder mStateAnimator;
public AnimatedPropertySetter(long duration, AnimatorSetBuilder builder) {
mDuration = duration;
mStateAnimator = builder;
}
@Override
public void setViewAlpha(View view, float alpha, TimeInterpolator interpolator) {
if (view.getAlpha() == alpha) {
return;
}
ObjectAnimator anim = ObjectAnimator.ofFloat(view, View.ALPHA, alpha);
anim.addListener(new AlphaUpdateListener(
view, isAccessibilityEnabled(view.getContext())));
anim.setDuration(mDuration).setInterpolator(interpolator);
mStateAnimator.play(anim);
}
@Override
public <T> void setFloat(T target, Property<T, Float> property, float value,
TimeInterpolator interpolator) {
if (property.get(target) == value) {
return;
}
Animator anim = ObjectAnimator.ofFloat(target, property, value);
anim.setDuration(mDuration).setInterpolator(interpolator);
mStateAnimator.play(anim);
}
@Override
public <T> void setInt(T target, Property<T, Integer> property, int value,
TimeInterpolator interpolator) {
if (property.get(target) == value) {
return;
}
Animator anim = ObjectAnimator.ofInt(target, property, value);
anim.setDuration(mDuration).setInterpolator(interpolator);
mStateAnimator.play(anim);
}
private TimeInterpolator getFadeInterpolator(float finalAlpha) {
return finalAlpha == 0 ? Interpolators.DEACCEL_2 : null;
}
}
}
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