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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.content.Context;
import android.content.res.Configuration;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewStub;
import android.widget.RelativeLayout;
import com.android.camera.ui.LayoutChangeHelper;
import com.android.camera.ui.LayoutChangeNotifier;
import com.android.gallery3d.R;
import com.android.gallery3d.common.ApiHelper;
/**
* A layout which handles the preview aspect ratio.
*/
public class PreviewFrameLayout extends RelativeLayout implements LayoutChangeNotifier {
private static final String TAG = "CAM_preview";
/** A callback to be invoked when the preview frame's size changes. */
public interface OnSizeChangedListener {
public void onSizeChanged(int width, int height);
}
private double mAspectRatio;
private View mBorder;
private OnSizeChangedListener mListener;
private LayoutChangeHelper mLayoutChangeHelper;
public PreviewFrameLayout(Context context, AttributeSet attrs) {
super(context, attrs);
setAspectRatio(4.0 / 3.0);
mLayoutChangeHelper = new LayoutChangeHelper(this);
}
@Override
protected void onFinishInflate() {
mBorder = findViewById(R.id.preview_border);
if (ApiHelper.HAS_FACE_DETECTION) {
ViewStub faceViewStub = (ViewStub) findViewById(R.id.face_view_stub);
/* preview_frame_video.xml does not have face view stub, so we need to
* check that.
*/
if (faceViewStub != null) {
faceViewStub.inflate();
}
}
}
public void setAspectRatio(double ratio) {
if (ratio <= 0.0) throw new IllegalArgumentException();
if (mAspectRatio != ratio) {
mAspectRatio = ratio;
requestLayout();
}
}
public void showBorder(boolean enabled) {
mBorder.setVisibility(enabled ? View.VISIBLE : View.INVISIBLE);
}
public void fadeOutBorder() {
Util.fadeOut(mBorder);
}
@Override
protected void onMeasure(int widthSpec, int heightSpec) {
int previewWidth = MeasureSpec.getSize(widthSpec);
int previewHeight = MeasureSpec.getSize(heightSpec);
if (!ApiHelper.HAS_SURFACE_TEXTURE) {
// Get the padding of the border background.
int hPadding = getPaddingLeft() + getPaddingRight();
int vPadding = getPaddingTop() + getPaddingBottom();
// Resize the preview frame with correct aspect ratio.
previewWidth -= hPadding;
previewHeight -= vPadding;
boolean widthLonger = previewWidth > previewHeight;
int longSide = (widthLonger ? previewWidth : previewHeight);
int shortSide = (widthLonger ? previewHeight : previewWidth);
if (longSide > shortSide * mAspectRatio) {
longSide = (int) ((double) shortSide * mAspectRatio);
} else {
shortSide = (int) ((double) longSide / mAspectRatio);
}
if (widthLonger) {
previewWidth = longSide;
previewHeight = shortSide;
} else {
previewWidth = shortSide;
previewHeight = longSide;
}
// 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));
}
public void setOnSizeChangedListener(OnSizeChangedListener listener) {
mListener = listener;
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
if (mListener != null) mListener.onSizeChanged(w, h);
}
@Override
public void setOnLayoutChangeListener(
LayoutChangeNotifier.Listener listener) {
mLayoutChangeHelper.setOnLayoutChangeListener(listener);
}
@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
super.onLayout(changed, l, t, r, b);
mLayoutChangeHelper.onLayout(changed, l, t, r, b);
}
}
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