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/*
* Copyright (C) 2013 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.content.Context;
import android.graphics.Point;
import android.graphics.RectF;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.ScaleGestureDetector;
import android.view.ScaleGestureDetector.OnScaleGestureListener;
import android.view.ViewTreeObserver;
import android.view.ViewTreeObserver.OnGlobalLayoutListener;
import com.android.photos.views.TiledImageRenderer.TileSource;
import com.android.photos.views.TiledImageView;
public class CropView extends TiledImageView implements OnScaleGestureListener {
private ScaleGestureDetector mScaleGestureDetector;
private float mLastX, mLastY;
private float mMinScale;
private boolean mTouchEnabled = true;
private RectF mTempEdges = new RectF();
public CropView(Context context) {
this(context, null);
}
public CropView(Context context, AttributeSet attrs) {
super(context, attrs);
mScaleGestureDetector = new ScaleGestureDetector(context, this);
}
private void getEdgesHelper(RectF edgesOut) {
final float width = getWidth();
final float height = getHeight();
final float imageWidth = mRenderer.source.getImageWidth();
final float imageHeight = mRenderer.source.getImageHeight();
final float scale = mRenderer.scale;
float centerX = (width / 2f - mRenderer.centerX + (imageWidth - width) / 2f)
* scale + width / 2f;
float centerY = (height / 2f - mRenderer.centerY + (imageHeight - height) / 2f)
* scale + height / 2f;
float leftEdge = centerX - imageWidth / 2f * scale;
float rightEdge = centerX + imageWidth / 2f * scale;
float topEdge = centerY - imageHeight / 2f * scale;
float bottomEdge = centerY + imageHeight / 2f * scale;
edgesOut.left = leftEdge;
edgesOut.right = rightEdge;
edgesOut.top = topEdge;
edgesOut.bottom = bottomEdge;
}
public RectF getCrop() {
final RectF edges = mTempEdges;
getEdgesHelper(edges);
final float scale = mRenderer.scale;
float cropLeft = -edges.left / scale;
float cropTop = -edges.top / scale;
float cropRight = cropLeft + getWidth() / scale;
float cropBottom = cropTop + getHeight() / scale;
return new RectF(cropLeft, cropTop, cropRight, cropBottom);
}
public Point getSourceDimensions() {
return new Point(mRenderer.source.getImageWidth(), mRenderer.source.getImageHeight());
}
public void setTileSource(TileSource source, Runnable isReadyCallback) {
super.setTileSource(source, isReadyCallback);
updateMinScale(getWidth(), getHeight(), source, true);
}
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
updateMinScale(w, h, mRenderer.source, false);
}
public void setScale(float scale) {
synchronized (mLock) {
mRenderer.scale = scale;
}
}
private void updateMinScale(int w, int h, TileSource source, boolean resetScale) {
synchronized (mLock) {
if (resetScale) {
mRenderer.scale = 1;
}
if (source != null) {
mMinScale = Math.max(w / (float) source.getImageWidth(),
h / (float) source.getImageHeight());
mRenderer.scale = Math.max(mMinScale, mRenderer.scale);
}
}
}
@Override
public boolean onScaleBegin(ScaleGestureDetector detector) {
return true;
}
@Override
public boolean onScale(ScaleGestureDetector detector) {
// Don't need the lock because this will only fire inside of
// onTouchEvent
mRenderer.scale *= detector.getScaleFactor();
mRenderer.scale = Math.max(mMinScale, mRenderer.scale);
invalidate();
return true;
}
@Override
public void onScaleEnd(ScaleGestureDetector detector) {
}
public void moveToUpperLeft() {
if (getWidth() == 0 || getHeight() == 0) {
final ViewTreeObserver observer = getViewTreeObserver();
observer.addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
public void onGlobalLayout() {
moveToUpperLeft();
getViewTreeObserver().removeOnGlobalLayoutListener(this);
}
});
}
final RectF edges = mTempEdges;
getEdgesHelper(edges);
final float scale = mRenderer.scale;
mRenderer.centerX += Math.ceil(edges.left / scale);
mRenderer.centerY += Math.ceil(edges.top / scale);
}
public void setTouchEnabled(boolean enabled) {
mTouchEnabled = enabled;
}
@Override
public boolean onTouchEvent(MotionEvent event) {
if (!mTouchEnabled) {
return true;
}
int action = event.getActionMasked();
final boolean pointerUp = action == MotionEvent.ACTION_POINTER_UP;
final int skipIndex = pointerUp ? event.getActionIndex() : -1;
// Determine focal point
float sumX = 0, sumY = 0;
final int count = event.getPointerCount();
for (int i = 0; i < count; i++) {
if (skipIndex == i)
continue;
sumX += event.getX(i);
sumY += event.getY(i);
}
final int div = pointerUp ? count - 1 : count;
float x = sumX / div;
float y = sumY / div;
synchronized (mLock) {
mScaleGestureDetector.onTouchEvent(event);
switch (action) {
case MotionEvent.ACTION_MOVE:
mRenderer.centerX += (mLastX - x) / mRenderer.scale;
mRenderer.centerY += (mLastY - y) / mRenderer.scale;
invalidate();
break;
}
if (mRenderer.source != null) {
// Adjust position so that the wallpaper covers the entire area
// of the screen
final RectF edges = mTempEdges;
getEdgesHelper(edges);
final float scale = mRenderer.scale;
if (edges.left > 0) {
mRenderer.centerX += Math.ceil(edges.left / scale);
}
if (edges.right < getWidth()) {
mRenderer.centerX += (edges.right - getWidth()) / scale;
}
if (edges.top > 0) {
mRenderer.centerY += Math.ceil(edges.top / scale);
}
if (edges.bottom < getHeight()) {
mRenderer.centerY += (edges.bottom - getHeight()) / scale;
}
}
}
mLastX = x;
mLastY = y;
return true;
}
}
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