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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.TimeInterpolator;
import android.content.Context;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewDebug;
import android.view.ViewGroup;
import android.view.ViewPropertyAnimator;
import android.view.accessibility.AccessibilityManager;
import android.view.animation.AccelerateInterpolator;
import android.widget.LinearLayout;
import com.android.launcher3.dragndrop.DragController;
import com.android.launcher3.dragndrop.DragOptions;
/*
* The top bar containing various drop targets: Delete/App Info/Uninstall.
*/
public class DropTargetBar extends LinearLayout implements DragController.DragListener {
protected static final int DEFAULT_DRAG_FADE_DURATION = 175;
protected static final TimeInterpolator DEFAULT_INTERPOLATOR = new AccelerateInterpolator();
private final Runnable mFadeAnimationEndRunnable = new Runnable() {
@Override
public void run() {
AccessibilityManager am = (AccessibilityManager)
getContext().getSystemService(Context.ACCESSIBILITY_SERVICE);
boolean accessibilityEnabled = am.isEnabled();
AlphaUpdateListener.updateVisibility(DropTargetBar.this, accessibilityEnabled);
}
};
@ViewDebug.ExportedProperty(category = "launcher")
protected boolean mDeferOnDragEnd;
@ViewDebug.ExportedProperty(category = "launcher")
protected boolean mVisible = false;
private ViewPropertyAnimator mCurrentAnimation;
public DropTargetBar(Context context, AttributeSet attrs) {
super(context, attrs);
}
public DropTargetBar(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
@Override
protected void onFinishInflate() {
super.onFinishInflate();
// Initialize with hidden state
setAlpha(0f);
}
public void setup(DragController dragController) {
dragController.addDragListener(this);
setupButtonDropTarget(this, dragController);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
boolean hideText = hideTextHelper(false /* shouldUpdateText */, false /* no-op */);
if (hideTextHelper(true /* shouldUpdateText */, hideText)) {
// Text has changed, so we need to re-measure.
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
}
/**
* Helper method that iterates through the children and returns whether any of the visible
* {@link ButtonDropTarget} has truncated text.
*
* @param shouldUpdateText If True, updates the text of all children.
* @param hideText If True and {@param shouldUpdateText} is True, clears the text of all
* children; otherwise it sets the original text value.
*
*
* @return If shouldUpdateText is True, returns whether any of the children updated their text.
* Else, returns whether any of the children have truncated their text.
*/
private boolean hideTextHelper(boolean shouldUpdateText, boolean hideText) {
boolean result = false;
View visibleView;
ButtonDropTarget dropTarget;
for (int i = getChildCount() - 1; i >= 0; --i) {
if (getChildAt(i) instanceof ButtonDropTarget) {
visibleView = dropTarget = (ButtonDropTarget) getChildAt(i);
} else if (getChildAt(i) instanceof ViewGroup) {
// The Drop Target is wrapped in a FrameLayout.
visibleView = getChildAt(i);
dropTarget = (ButtonDropTarget) ((ViewGroup) visibleView).getChildAt(0);
} else {
// Ignore other views.
continue;
}
if (visibleView.getVisibility() == View.VISIBLE) {
if (shouldUpdateText) {
result |= dropTarget.updateText(hideText);
} else if (dropTarget.isTextTruncated()) {
result = true;
break;
}
}
}
return result;
}
private void setupButtonDropTarget(View view, DragController dragController) {
if (view instanceof ButtonDropTarget) {
ButtonDropTarget bdt = (ButtonDropTarget) view;
bdt.setDropTargetBar(this);
dragController.addDragListener(bdt);
dragController.addDropTarget(bdt);
} else if (view instanceof ViewGroup) {
ViewGroup vg = (ViewGroup) view;
for (int i = vg.getChildCount() - 1; i >= 0; i--) {
setupButtonDropTarget(vg.getChildAt(i), dragController);
}
}
}
private void animateToVisibility(boolean isVisible) {
if (mVisible != isVisible) {
mVisible = isVisible;
// Cancel any existing animation
if (mCurrentAnimation != null) {
mCurrentAnimation.cancel();
mCurrentAnimation = null;
}
float finalAlpha = mVisible ? 1 : 0;
if (Float.compare(getAlpha(), finalAlpha) != 0) {
setVisibility(View.VISIBLE);
mCurrentAnimation = animate().alpha(finalAlpha)
.setInterpolator(DEFAULT_INTERPOLATOR)
.setDuration(DEFAULT_DRAG_FADE_DURATION)
.withEndAction(mFadeAnimationEndRunnable);
}
}
}
/*
* DragController.DragListener implementation
*/
@Override
public void onDragStart(DropTarget.DragObject dragObject, DragOptions options) {
animateToVisibility(true);
}
/**
* 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) {
animateToVisibility(false);
} else {
mDeferOnDragEnd = false;
}
}
}
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