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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 com.android.camera.R;
import android.app.Activity;
import android.content.Context;
import android.content.pm.ActivityInfo;
import android.view.View;
import android.util.AttributeSet;
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;
public PreviewFrameLayout(Context context, AttributeSet attrs) {
super(context, attrs);
setAspectRatio(4.0 / 3.0);
}
public void setAspectRatio(double ratio) {
if (ratio <= 0.0) throw new IllegalArgumentException();
if (((Activity) getContext()).getRequestedOrientation()
== ActivityInfo.SCREEN_ORIENTATION_PORTRAIT) {
ratio = 1 / ratio;
}
if (mAspectRatio != ratio) {
mAspectRatio = ratio;
requestLayout();
}
}
public void showBorder(boolean enabled) {
findViewById(R.id.preview_border).setVisibility(
enabled ? View.VISIBLE : View.INVISIBLE);
}
@Override
protected void onMeasure(int widthSpec, int heightSpec) {
int previewWidth = MeasureSpec.getSize(widthSpec);
int previewHeight = MeasureSpec.getSize(heightSpec);
// Get the padding of the border background.
int hPadding = mPaddingLeft + mPaddingRight;
int vPadding = mPaddingTop + mPaddingBottom;
// Resize the preview frame with correct aspect ratio.
previewWidth -= hPadding;
previewHeight -= vPadding;
if (previewWidth > previewHeight * mAspectRatio) {
previewWidth = (int) (previewHeight * mAspectRatio + .5);
} else {
previewHeight = (int) (previewWidth / mAspectRatio + .5);
}
// Add the padding of the border.
previewWidth += hPadding;
previewHeight += vPadding;
// Ask children to follow the new preview dimension.
super.onMeasure(MeasureSpec.makeMeasureSpec(previewWidth, MeasureSpec.EXACTLY),
MeasureSpec.makeMeasureSpec(previewHeight, MeasureSpec.EXACTLY));
}
}
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