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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.widget.RelativeLayout;
/**
* A layout which handles the preview aspect ratio.
*/
public class PreviewFrameLayout extends RelativeLayout {
/** 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 View mFrame;
private View mPreviewBorder;
private final DisplayMetrics mMetrics = new DisplayMetrics();
public PreviewFrameLayout(Context context, AttributeSet attrs) {
super(context, attrs);
((Activity) context).getWindowManager()
.getDefaultDisplay().getMetrics(mMetrics);
}
@Override
protected void onFinishInflate() {
super.onFinishInflate();
mFrame = (View) findViewById(R.id.frame);
mPreviewBorder = (View) findViewById(R.id.preview_border);
}
public void setAspectRatio(double ratio) {
if (ratio <= 0.0) throw new IllegalArgumentException();
if (mAspectRatio != ratio) {
mAspectRatio = ratio;
requestLayout();
}
}
@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
// Calculate the width and the height of preview frame.
int frameWidth = getWidth();
int frameHeight = getHeight();
int hPadding = 0;
int vPadding = 0;
if (mPreviewBorder != null) {
hPadding = mPreviewBorder.getPaddingLeft() + mPreviewBorder.getPaddingRight();
vPadding = mPreviewBorder.getPaddingBottom() + mPreviewBorder.getPaddingTop();
}
int previewHeight = frameHeight - vPadding;
int previewWidth = frameWidth - hPadding;
if (previewWidth > previewHeight * mAspectRatio) {
previewWidth = (int) (previewHeight * mAspectRatio + .5);
} else {
previewHeight = (int) (previewWidth / mAspectRatio + .5);
}
// Measure and layout preview frame.
int hSpace = ((r - l) - previewWidth) / 2;
int vSpace = ((b - t) - previewHeight) / 2;
mFrame.measure(
MeasureSpec.makeMeasureSpec(previewWidth, MeasureSpec.EXACTLY),
MeasureSpec.makeMeasureSpec(previewHeight, MeasureSpec.EXACTLY));
mFrame.layout(hSpace, vSpace, frameWidth + hSpace, frameHeight + vSpace);
// Measure and layout the border of preview frame.
if (mPreviewBorder != null) {
frameWidth = previewWidth + hPadding;
frameHeight = previewHeight + vPadding;
hSpace = ((r - l) - frameWidth) / 2;
vSpace = ((b - t) - frameHeight) / 2;
mPreviewBorder.measure(
MeasureSpec.makeMeasureSpec(frameWidth, MeasureSpec.EXACTLY),
MeasureSpec.makeMeasureSpec(frameHeight, MeasureSpec.EXACTLY));
mPreviewBorder.layout(hSpace, vSpace, frameWidth + hSpace, frameHeight + vSpace);
}
}
}
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