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/*
* Copyright (C) 2016 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.folder;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.PorterDuff;
import android.graphics.Rect;
import android.view.View;
import android.widget.ImageView;
import com.android.launcher3.Launcher;
import com.android.launcher3.R;
import com.android.launcher3.dragndrop.DragLayer;
/**
* A temporary view which displays the a bitmap (used for folder icon animation)
*/
public class PreviewImageView extends ImageView {
private final Rect mTempRect = new Rect();
private final DragLayer mParent;
private Bitmap mBitmap;
private Canvas mCanvas;
public PreviewImageView(DragLayer parent) {
super(parent.getContext());
mParent = parent;
}
public void copy(View view) {
final int width = view.getMeasuredWidth();
final int height = view.getMeasuredHeight();
if (mBitmap == null || mBitmap.getWidth() != width || mBitmap.getHeight() != height) {
mBitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
mCanvas = new Canvas(mBitmap);
}
DragLayer.LayoutParams lp;
if (getLayoutParams() instanceof DragLayer.LayoutParams) {
lp = (DragLayer.LayoutParams) getLayoutParams();
} else {
lp = new DragLayer.LayoutParams(width, height);
}
// The layout from which the folder is being opened may be scaled, adjust the starting
// view size by this scale factor.
float scale = mParent.getDescendantRectRelativeToSelf(view, mTempRect);
lp.customPosition = true;
lp.x = mTempRect.left;
lp.y = mTempRect.top;
lp.width = (int) (scale * width);
lp.height = (int) (scale * height);
mCanvas.drawColor(0, PorterDuff.Mode.CLEAR);
view.draw(mCanvas);
setImageBitmap(mBitmap);
// Just in case this image view is still in the drag layer from a previous animation,
// we remove it and re-add it.
removeFromParent();
mParent.addView(this, lp);
}
public void removeFromParent() {
if (mParent.indexOfChild(this) != -1) {
mParent.removeView(this);
}
}
public static PreviewImageView get(Context context) {
DragLayer dragLayer = Launcher.getLauncher(context).getDragLayer();
PreviewImageView view = (PreviewImageView) dragLayer.getTag(R.id.preview_image_id);
if (view == null) {
view = new PreviewImageView(dragLayer);
dragLayer.setTag(R.id.preview_image_id, view);
}
return view;
}
}
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