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      1 /*
      2  * Copyright (C) 2009 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.android.camera;
     18 
     19 import com.android.camera.R;
     20 
     21 import android.content.Context;
     22 import android.graphics.Rect;
     23 import android.util.AttributeSet;
     24 import android.widget.RelativeLayout;
     25 /**
     26  * A layout which handles the preview aspect ratio.
     27  */
     28 public class PreviewFrameLayout extends RelativeLayout {
     29     /** A callback to be invoked when the preview frame's size changes. */
     30     public interface OnSizeChangedListener {
     31         public void onSizeChanged();
     32     }
     33 
     34     private double mAspectRatio = 4.0 / 3.0;
     35 
     36     public PreviewFrameLayout(Context context, AttributeSet attrs) {
     37         super(context, attrs);
     38     }
     39 
     40     public void setAspectRatio(double ratio) {
     41         if (ratio <= 0.0) throw new IllegalArgumentException();
     42         if (mAspectRatio != ratio) {
     43             mAspectRatio = ratio;
     44             requestLayout();
     45         }
     46     }
     47 
     48     public void showBorder(boolean enabled) {
     49         setActivated(enabled);
     50     }
     51 
     52 
     53     @Override
     54     protected void onMeasure(int widthSpec, int heightSpec) {
     55         int previewWidth = MeasureSpec.getSize(widthSpec);
     56         int previewHeight = MeasureSpec.getSize(heightSpec);
     57 
     58         // Get the padding of the border background.
     59         int hPadding = mPaddingLeft + mPaddingRight;
     60         int vPadding = mPaddingTop + mPaddingBottom;
     61 
     62         // Resize the preview frame with correct aspect ratio.
     63         previewWidth -= hPadding;
     64         previewHeight -= vPadding;
     65         if (previewWidth > previewHeight * mAspectRatio) {
     66             previewWidth = (int) (previewHeight * mAspectRatio + .5);
     67         } else {
     68             previewHeight = (int) (previewWidth / mAspectRatio + .5);
     69         }
     70 
     71         // Add the padding of the border.
     72         previewWidth += hPadding;
     73         previewHeight += vPadding;
     74 
     75         // Ask children to follow the new preview dimension.
     76         super.onMeasure(MeasureSpec.makeMeasureSpec(previewWidth, MeasureSpec.EXACTLY),
     77                 MeasureSpec.makeMeasureSpec(previewHeight, MeasureSpec.EXACTLY));
     78     }
     79 }
     80