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      1 /*
      2  * Copyright (C) 2010 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.ui;
     18 
     19 import com.android.camera.ui.Rotatable;
     20 
     21 import android.content.Context;
     22 import android.util.AttributeSet;
     23 import android.view.View;
     24 import android.view.ViewGroup;
     25 
     26 // A RotateLayout is designed to display a single item and provides the
     27 // capabilities to rotate the item.
     28 public class RotateLayout extends ViewGroup implements Rotatable {
     29     private static final String TAG = "RotateLayout";
     30     private int mOrientation;
     31     private View mChild;
     32 
     33     public RotateLayout(Context context, AttributeSet attrs) {
     34         super(context, attrs);
     35         // The transparent background here is a workaround of the render issue
     36         // happened when the view is rotated as the device's orientation
     37         // changed. The view looks fine in landscape. After rotation, the view
     38         // is invisible.
     39         setBackgroundResource(android.R.color.transparent);
     40     }
     41 
     42     @Override
     43     protected void onFinishInflate() {
     44         mChild = getChildAt(0);
     45         mChild.setPivotX(0);
     46         mChild.setPivotY(0);
     47     }
     48 
     49     @Override
     50     protected void onLayout(
     51             boolean change, int left, int top, int right, int bottom) {
     52         int width = right - left;
     53         int height = bottom - top;
     54         switch (mOrientation) {
     55             case 0:
     56             case 180:
     57                 mChild.layout(0, 0, width, height);
     58                 break;
     59             case 90:
     60             case 270:
     61                 mChild.layout(0, 0, height, width);
     62                 break;
     63         }
     64     }
     65 
     66     @Override
     67     protected void onMeasure(int widthSpec, int heightSpec) {
     68         int w = 0, h = 0;
     69         switch(mOrientation) {
     70             case 0:
     71             case 180:
     72                 measureChild(mChild, widthSpec, heightSpec);
     73                 w = mChild.getMeasuredWidth();
     74                 h = mChild.getMeasuredHeight();
     75                 break;
     76             case 90:
     77             case 270:
     78                 measureChild(mChild, heightSpec, widthSpec);
     79                 w = mChild.getMeasuredHeight();
     80                 h = mChild.getMeasuredWidth();
     81                 break;
     82         }
     83         setMeasuredDimension(w, h);
     84 
     85         switch (mOrientation) {
     86             case 0:
     87                 mChild.setTranslationX(0);
     88                 mChild.setTranslationY(0);
     89                 break;
     90             case 90:
     91                 mChild.setTranslationX(0);
     92                 mChild.setTranslationY(h);
     93                 break;
     94             case 180:
     95                 mChild.setTranslationX(w);
     96                 mChild.setTranslationY(h);
     97                 break;
     98             case 270:
     99                 mChild.setTranslationX(w);
    100                 mChild.setTranslationY(0);
    101                 break;
    102         }
    103         mChild.setRotation(-mOrientation);
    104     }
    105 
    106     // Rotate the view counter-clockwise
    107     public void setOrientation(int orientation) {
    108         orientation = orientation % 360;
    109         if (mOrientation == orientation) return;
    110         mOrientation = orientation;
    111         requestLayout();
    112     }
    113 }
    114