/*
* Copyright (C) 2010 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.camera.ui;
import android.annotation.TargetApi;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.graphics.Rect;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewParent;
import com.android.gallery3d.common.ApiHelper;
import com.android.gallery3d.util.MotionEventHelper;
// A RotateLayout is designed to display a single item and provides the
// capabilities to rotate the item.
public class RotateLayout extends ViewGroup implements Rotatable {
@SuppressWarnings("unused")
private static final String TAG = "RotateLayout";
private int mOrientation;
private Matrix mMatrix = new Matrix();
protected View mChild;
public RotateLayout(Context context, AttributeSet attrs) {
super(context, attrs);
// The transparent background here is a workaround of the render issue
// happened when the view is rotated as the device's orientation
// changed. The view looks fine in landscape. After rotation, the view
// is invisible.
setBackgroundResource(android.R.color.transparent);
}
@TargetApi(ApiHelper.VERSION_CODES.HONEYCOMB)
@Override
protected void onFinishInflate() {
mChild = getChildAt(0);
if (ApiHelper.HAS_VIEW_TRANSFORM_PROPERTIES) {
mChild.setPivotX(0);
mChild.setPivotY(0);
}
}
@Override
protected void onLayout(
boolean change, int left, int top, int right, int bottom) {
int width = right - left;
int height = bottom - top;
switch (mOrientation) {
case 0:
case 180:
mChild.layout(0, 0, width, height);
break;
case 90:
case 270:
mChild.layout(0, 0, height, width);
break;
}
}
@Override
public boolean dispatchTouchEvent(MotionEvent event) {
if (!ApiHelper.HAS_VIEW_TRANSFORM_PROPERTIES) {
final int w = getMeasuredWidth();
final int h = getMeasuredHeight();
switch (mOrientation) {
case 0:
mMatrix.setTranslate(0, 0);
break;
case 90:
mMatrix.setTranslate(0, -h);
break;
case 180:
mMatrix.setTranslate(-w, -h);
break;
case 270:
mMatrix.setTranslate(-w, 0);
break;
}
mMatrix.postRotate(mOrientation);
event = MotionEventHelper.transformEvent(event, mMatrix);
}
return super.dispatchTouchEvent(event);
}
@Override
protected void dispatchDraw(Canvas canvas) {
if (ApiHelper.HAS_VIEW_TRANSFORM_PROPERTIES) {
super.dispatchDraw(canvas);
} else {
canvas.save();
int w = getMeasuredWidth();
int h = getMeasuredHeight();
switch (mOrientation) {
case 0:
canvas.translate(0, 0);
break;
case 90:
canvas.translate(0, h);
break;
case 180:
canvas.translate(w, h);
break;
case 270:
canvas.translate(w, 0);
break;
}
canvas.rotate(-mOrientation, 0, 0);
super.dispatchDraw(canvas);
canvas.restore();
}
}
@TargetApi(ApiHelper.VERSION_CODES.HONEYCOMB)
@Override
protected void onMeasure(int widthSpec, int heightSpec) {
int w = 0, h = 0;
switch(mOrientation) {
case 0:
case 180:
measureChild(mChild, widthSpec, heightSpec);
w = mChild.getMeasuredWidth();
h = mChild.getMeasuredHeight();
break;
case 90:
case 270:
measureChild(mChild, heightSpec, widthSpec);
w = mChild.getMeasuredHeight();
h = mChild.getMeasuredWidth();
break;
}
setMeasuredDimension(w, h);
if (ApiHelper.HAS_VIEW_TRANSFORM_PROPERTIES) {
switch (mOrientation) {
case 0:
mChild.setTranslationX(0);
mChild.setTranslationY(0);
break;
case 90:
mChild.setTranslationX(0);
mChild.setTranslationY(h);
break;
case 180:
mChild.setTranslationX(w);
mChild.setTranslationY(h);
break;
case 270:
mChild.setTranslationX(w);
mChild.setTranslationY(0);
break;
}
mChild.setRotation(-mOrientation);
}
}
@Override
public boolean shouldDelayChildPressedState() {
return false;
}
// Rotate the view counter-clockwise
@Override
public void setOrientation(int orientation, boolean animation) {
orientation = orientation % 360;
if (mOrientation == orientation) return;
mOrientation = orientation;
requestLayout();
}
public int getOrientation() {
return mOrientation;
}
@Override
public ViewParent invalidateChildInParent(int[] location, Rect r) {
if (!ApiHelper.HAS_VIEW_TRANSFORM_PROPERTIES && mOrientation != 0) {
// The workaround invalidates the entire rotate layout. After
// rotation, the correct area to invalidate may be larger than the
// size of the child. Ex: ListView. There is no way to invalidate
// only the necessary area.
r.set(0, 0, getWidth(), getHeight());
}
return super.invalidateChildInParent(location, r);
}
}