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/*
* Copyright (C) 2011 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 android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.animation.AnimatorSet;
import android.animation.ObjectAnimator;
import android.animation.TimeInterpolator;
import android.content.Context;
import android.util.AttributeSet;
import android.view.View;
import android.view.accessibility.AccessibilityManager;
import android.view.animation.AccelerateInterpolator;
import android.widget.FrameLayout;
import com.android.launcher3.dragndrop.DragController;
/**
* Base class for drop target bars (where you can drop apps to do actions such as uninstall).
*/
public abstract class BaseDropTargetBar extends FrameLayout implements DragController.DragListener {
protected static final int DEFAULT_DRAG_FADE_DURATION = 175;
protected static final TimeInterpolator DEFAULT_INTERPOLATOR = new AccelerateInterpolator();
protected View mDropTargetBar;
protected boolean mAccessibilityEnabled = false;
protected AnimatorSet mCurrentAnimation;
protected boolean mDeferOnDragEnd;
public BaseDropTargetBar(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public BaseDropTargetBar(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
@Override
protected void onFinishInflate() {
super.onFinishInflate();
mDropTargetBar = findViewById(R.id.drag_target_bar);
// Create the various fade animations
mDropTargetBar.setAlpha(0f);
}
/**
* Convenience method to animate the alpha of a view.
*/
protected void animateAlpha(View v, float alpha, TimeInterpolator interpolator) {
if (Float.compare(v.getAlpha(), alpha) != 0) {
ObjectAnimator anim = ObjectAnimator.ofFloat(v, View.ALPHA, alpha);
anim.setInterpolator(interpolator);
anim.addListener(new ViewVisiblilyUpdateHandler(v));
mCurrentAnimation.play(anim);
}
}
protected void resetAnimation(int newAnimationDuration) {
// Update the accessibility state
AccessibilityManager am = (AccessibilityManager)
getContext().getSystemService(Context.ACCESSIBILITY_SERVICE);
mAccessibilityEnabled = am.isEnabled();
// Cancel any existing animation
if (mCurrentAnimation != null) {
mCurrentAnimation.cancel();
mCurrentAnimation = null;
}
if (newAnimationDuration > 0) {
mCurrentAnimation = new AnimatorSet();
mCurrentAnimation.setDuration(newAnimationDuration);
}
}
/*
* DragController.DragListener implementation
*/
@Override
public void onDragStart(DragSource source, ItemInfo info, int dragAction) {
showDropTargets();
}
/**
* This is called to defer hiding the delete drop target until the drop animation has completed,
* instead of hiding immediately when the drag has ended.
*/
protected void deferOnDragEnd() {
mDeferOnDragEnd = true;
}
@Override
public void onDragEnd() {
if (!mDeferOnDragEnd) {
hideDropTargets();
} else {
mDeferOnDragEnd = false;
}
}
public abstract void showDropTargets();
public abstract void hideDropTargets();
public abstract void enableAccessibleDrag(boolean enable);
public abstract void setup(Launcher launcher, DragController dragController);
private class ViewVisiblilyUpdateHandler extends AnimatorListenerAdapter {
private final View mView;
ViewVisiblilyUpdateHandler(View v) {
mView = v;
}
@Override
public void onAnimationStart(Animator animation) {
// Ensure that the view is visible for the animation
mView.setVisibility(View.VISIBLE);
}
@Override
public void onAnimationEnd(Animator animation){
AlphaUpdateListener.updateVisibility(mView, mAccessibilityEnabled);
}
}
}
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