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/*
* Copyright (C) 2014 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 android.view;
import android.graphics.Canvas;
import android.graphics.Matrix;
/**
* This view draws another View in an Overlay without changing the parent. It will not be drawn
* by its parent because its visibility is set to INVISIBLE, but will be drawn
* here using its render node. When the GhostView is set to INVISIBLE, the View it is
* shadowing will become VISIBLE and when the GhostView becomes VISIBLE, the shadowed
* view becomes INVISIBLE.
* @hide
*/
public class GhostView extends View {
private final Matrix mMatrix = new Matrix();
private final View mView;
private GhostView(View view, ViewGroup host) {
super(view.getContext());
mView = view;
setMatrix(host);
mView.mGhostView = this;
final ViewGroup parent = (ViewGroup) mView.getParent();
setLeft(0);
setTop(0);
setRight(host.getWidth());
setBottom(host.getHeight());
setGhostedVisibility(View.INVISIBLE);
parent.mRecreateDisplayList = true;
parent.getDisplayList();
}
@Override
protected void onDraw(Canvas canvas) {
if (canvas instanceof HardwareCanvas) {
HardwareCanvas hwCanvas = (HardwareCanvas) canvas;
int saveCount = hwCanvas.save(Canvas.MATRIX_SAVE_FLAG);
canvas.concat(mMatrix);
mView.mRecreateDisplayList = true;
RenderNode renderNode = mView.getDisplayList();
if (renderNode.isValid()) {
hwCanvas.drawRenderNode(renderNode);
}
hwCanvas.restoreToCount(saveCount);
}
}
@Override
public void setVisibility(@Visibility int visibility) {
super.setVisibility(visibility);
if (mView.mGhostView == this) {
int inverseVisibility = (visibility == View.VISIBLE) ? View.INVISIBLE : View.VISIBLE;
setGhostedVisibility(inverseVisibility);
}
}
private void setGhostedVisibility(int visibility) {
mView.mViewFlags = (mView.mViewFlags & ~View.VISIBILITY_MASK) | visibility;
}
@Override
protected void onDetachedFromWindow() {
super.onDetachedFromWindow();
setGhostedVisibility(View.VISIBLE);
mView.mGhostView = null;
final ViewGroup parent = (ViewGroup) mView.getParent();
parent.mRecreateDisplayList = true;
parent.getDisplayList();
}
private void setMatrix(ViewGroup host) {
host.transformMatrixToLocal(mMatrix);
ViewGroup parent = (ViewGroup) mView.getParent();
parent.transformMatrixToGlobal(mMatrix);
mMatrix.postTranslate(-parent.getScrollX(), -parent.getScrollY());
}
public static GhostView addGhost(View view, ViewGroup viewGroup) {
if (!(view.getParent() instanceof ViewGroup)) {
throw new IllegalArgumentException("Ghosted views must be parented by a ViewGroup");
}
ViewGroupOverlay overlay = viewGroup.getOverlay();
ViewOverlay.OverlayViewGroup overlayViewGroup = overlay.mOverlayViewGroup;
GhostView ghostView = view.mGhostView;
if (ghostView != null) {
ViewGroup oldParent = (ViewGroup) ghostView.getParent();
if (oldParent != overlayViewGroup) {
oldParent.removeView(ghostView);
ghostView = null;
}
}
if (ghostView == null) {
ghostView = new GhostView(view, (ViewGroup) overlayViewGroup.mHostView);
overlay.add(ghostView);
}
return ghostView;
}
public static void removeGhost(View view) {
GhostView ghostView = view.mGhostView;
if (ghostView != null) {
ViewGroup parent = (ViewGroup) ghostView.getParent();
parent.removeView(ghostView);
}
}
public static GhostView getGhost(View view) {
return view.mGhostView;
}
}
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