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/*
* Copyright (C) 2009 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;
import android.app.Activity;
import android.content.Context;
import android.util.AttributeSet;
import android.util.DisplayMetrics;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.FrameLayout;
import com.google.android.camera.R;
/**
* A layout which handles the preview aspect ratio and the position of
* the gripper.
*/
public class PreviewFrameLayout extends ViewGroup {
private static final int MIN_HORIZONTAL_MARGIN = 10; // 10dp
/** A callback to be invoked when the preview frame's size changes. */
public interface OnSizeChangedListener {
public void onSizeChanged();
}
private double mAspectRatio = 4.0 / 3.0;
private ImageView mGripper;
private FrameLayout mFrame;
private OnSizeChangedListener mSizeListener;
private DisplayMetrics mMetrics = new DisplayMetrics();
public PreviewFrameLayout(Context context, AttributeSet attrs) {
super(context, attrs);
((Activity) context).getWindowManager()
.getDefaultDisplay().getMetrics(mMetrics);
}
public void setOnSizeChangedListener(OnSizeChangedListener listener) {
mSizeListener = listener;
}
@Override
protected void onFinishInflate() {
mGripper = (ImageView) findViewById(R.id.btn_gripper);
mFrame = (FrameLayout) findViewById(R.id.frame);
if (mFrame == null) {
throw new IllegalStateException(
"must provide child with id as \"frame\"");
}
}
public void setAspectRatio(double ratio) {
if (ratio <= 0.0) throw new IllegalArgumentException();
if (mAspectRatio != ratio) {
mAspectRatio = ratio;
requestLayout();
}
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
int gripperWidth = 0;
int gripperHeight = 0;
if (mGripper != null) {
measureChild(mGripper, widthMeasureSpec, heightMeasureSpec);
gripperWidth = mGripper.getMeasuredWidth();
gripperHeight = mGripper.getMeasuredHeight();
}
int frameWidth = getMeasuredWidth() - (int) Math.max(
gripperWidth, MIN_HORIZONTAL_MARGIN * mMetrics.density);
int frameHeight = getMeasuredHeight();
FrameLayout f = mFrame;
int horizontalPadding = f.getPaddingLeft() + f.getPaddingRight();
int verticalPadding = f.getPaddingBottom() + f.getPaddingTop();
int previewWidth = frameWidth - horizontalPadding;
int previewHeight = frameHeight - verticalPadding;
// resize frame and preview for aspect ratio
if (previewWidth > previewHeight * mAspectRatio) {
previewWidth = (int) (previewHeight * mAspectRatio + .5);
} else {
previewHeight = (int) (previewWidth / mAspectRatio + .5);
}
frameWidth = previewWidth + horizontalPadding;
frameHeight = previewHeight + verticalPadding;
measureChild(mFrame,
MeasureSpec.makeMeasureSpec(MeasureSpec.EXACTLY, frameWidth),
MeasureSpec.makeMeasureSpec(MeasureSpec.EXACTLY, frameHeight));
}
@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
// Try to layout the "frame" in the center of the area, and put
// "gripper" just to the left of it. If there is no enough space for
// the gripper, the "frame" will be moved a little right so that
// they won't overlap with each other.
int frameWidth = mFrame.getMeasuredWidth();
int frameHeight = mFrame.getMeasuredHeight();
int leftSpace = ((r - l) - frameWidth) / 2;
int topSpace = ((b - t) - frameHeight) / 2;
int gripperWidth = 0;
int gripperHeight = 0;
if (mGripper != null) {
gripperWidth = mGripper.getMeasuredWidth();
gripperHeight = mGripper.getMeasuredHeight();
myLayoutChild(mGripper,
Math.max(l, l + (leftSpace - gripperWidth)),
t + ((b - t) - gripperHeight) / 2,
gripperWidth, gripperHeight);
}
myLayoutChild(mFrame, Math.max(l + leftSpace, l + gripperWidth),
t + topSpace, frameWidth, frameHeight);
if (mSizeListener != null) {
mSizeListener.onSizeChanged();
}
}
private static void myLayoutChild(View child, int l, int t, int w, int h) {
child.layout(l, t, l + w, t + h);
}
}
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