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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.content.Context;
import android.util.AttributeSet;
import android.view.View;
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 View mDropTargetBar;
protected LauncherViewPropertyAnimator mDropTargetBarAnimator;
protected static final AccelerateInterpolator sAccelerateInterpolator =
new AccelerateInterpolator();
protected boolean mAccessibilityEnabled = false;
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);
mDropTargetBarAnimator = new LauncherViewPropertyAnimator(mDropTargetBar);
mDropTargetBarAnimator.setInterpolator(sAccelerateInterpolator);
mDropTargetBarAnimator.addListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationStart(Animator animation) {
// Ensure that the view is visible for the animation
mDropTargetBar.setVisibility(View.VISIBLE);
}
@Override
public void onAnimationEnd(Animator animation) {
if (mDropTargetBar != null) {
AlphaUpdateListener.updateVisibility(mDropTargetBar, mAccessibilityEnabled);
}
}
});
}
/**
* Convenience method to animate the alpha of a view using hardware layers.
*/
protected void animateViewAlpha(LauncherViewPropertyAnimator animator, View v, float alpha,
int duration) {
if (v == null) {
return;
}
animator.cancel();
if (Float.compare(v.getAlpha(), alpha) != 0) {
if (duration > 0) {
animator.alpha(alpha).withLayer().setDuration(duration).start();
} else {
v.setAlpha(alpha);
AlphaUpdateListener.updateVisibility(v, mAccessibilityEnabled);
}
}
}
/*
* 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);
}
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