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/*
* Copyright (C) 2012 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.gallery3d.app;
import android.graphics.RectF;
import android.os.Handler;
import android.util.Log;
import com.android.gallery3d.ui.GLCanvas;
import com.android.gallery3d.ui.ScreenNail;
// This is a ScreenNail whose actually display is done by an foreign component.
// The foreign component tells the ScreenNail its size by setSize(). The
// ScreenNail tells the foreign component the position to display by
// updateView().
class ScreenNailBridge implements ScreenNail {
private static final String TAG = "ScreenNailBridge";
private int mWidth, mHeight;
private boolean mVisible = false;
private int mDrawX, mDrawY, mDrawWidth, mDrawHeight;
private Listener mListener;
private Handler mMainHandler;
public interface Listener {
// This is called from the main thread.
void updateView(boolean visible, int x, int y, int width, int height);
};
// The constructor should be called from the main thread.
public ScreenNailBridge(Listener listener) {
mListener = listener;
mMainHandler = new Handler();
}
// This can be called from any thread. (We expect it to be called from the
// main thread).
public synchronized void setSize(int w, int h) {
mWidth = w;
mHeight = h;
}
// This can be called from any thread. (We expect it to be called from GL
// thread)
@Override
public synchronized int getWidth() {
return mWidth;
}
// This can be called from any thread. (We expect it to be called from GL
// thread)
@Override
public synchronized int getHeight() {
return mHeight;
}
@Override
public int getRotation() {
return 0;
}
// This is run in the main thread.
private Runnable mUpdateViewRunnable = new Runnable() {
public void run() {
boolean v;
int x, y, width, height;
synchronized (ScreenNailBridge.this) {
v = mVisible;
x = mDrawX;
y = mDrawY;
width = mDrawWidth;
height = mDrawHeight;
}
mListener.updateView(v, x, y, width, height);
}
};
@Override
public synchronized void draw(GLCanvas canvas, int x, int y, int width, int height) {
if (mVisible && mDrawX == x && mDrawY == y && mDrawWidth == width &&
mDrawHeight == height) {
return;
}
mVisible = true;
mDrawX = x;
mDrawY = y;
mDrawWidth = width;
mDrawHeight = height;
mMainHandler.post(mUpdateViewRunnable);
}
@Override
public synchronized void disableDraw() {
if (!mVisible) return;
mVisible = false;
mMainHandler.post(mUpdateViewRunnable);
}
@Override
public void recycle() {
// Make sure we will not draw anymore.
disableDraw();
}
@Override
public void draw(GLCanvas canvas, RectF source, RectF dest) {
throw new UnsupportedOperationException();
}
}
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