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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 android.content.Context;
     20 import android.graphics.Matrix;
     21 import android.util.AttributeSet;
     22 import android.view.View;
     23 import android.view.ViewGroup;
     24 
     25 import com.android.camera.debug.Log;
     26 
     27 // A RotateLayout is designed to display a single item and provides the
     28 // capabilities to rotate the item.
     29 public class RotateLayout extends ViewGroup implements Rotatable {
     30     @SuppressWarnings("unused")
     31     private static final Log.Tag TAG = new Log.Tag("RotateLayout");
     32     private int mOrientation;
     33     private Matrix mMatrix = new Matrix();
     34     protected View mChild;
     35 
     36     public RotateLayout(Context context, AttributeSet attrs) {
     37         super(context, attrs);
     38         // The transparent background here is a workaround of the render issue
     39         // happened when the view is rotated as the device's orientation
     40         // changed. The view looks fine in landscape. After rotation, the view
     41         // is invisible.
     42         setBackgroundResource(android.R.color.transparent);
     43     }
     44 
     45     @Override
     46     protected void onFinishInflate() {
     47         mChild = getChildAt(0);
     48         mChild.setPivotX(0);
     49         mChild.setPivotY(0);
     50     }
     51 
     52     @Override
     53     protected void onLayout(
     54             boolean change, int left, int top, int right, int bottom) {
     55         int width = right - left;
     56         int height = bottom - top;
     57         switch (mOrientation) {
     58             case 0:
     59             case 180:
     60                 mChild.layout(0, 0, width, height);
     61                 break;
     62             case 90:
     63             case 270:
     64                 mChild.layout(0, 0, height, width);
     65                 break;
     66         }
     67     }
     68 
     69     @Override
     70     protected void onMeasure(int widthSpec, int heightSpec) {
     71         int w = 0, h = 0;
     72         switch(mOrientation) {
     73             case 0:
     74             case 180:
     75                 measureChild(mChild, widthSpec, heightSpec);
     76                 w = mChild.getMeasuredWidth();
     77                 h = mChild.getMeasuredHeight();
     78                 break;
     79             case 90:
     80             case 270:
     81                 measureChild(mChild, heightSpec, widthSpec);
     82                 w = mChild.getMeasuredHeight();
     83                 h = mChild.getMeasuredWidth();
     84                 break;
     85         }
     86         setMeasuredDimension(w, h);
     87 
     88         switch (mOrientation) {
     89             case 0:
     90                 mChild.setTranslationX(0);
     91                 mChild.setTranslationY(0);
     92                 break;
     93             case 90:
     94                 mChild.setTranslationX(0);
     95                 mChild.setTranslationY(h);
     96                 break;
     97             case 180:
     98                 mChild.setTranslationX(w);
     99                 mChild.setTranslationY(h);
    100                 break;
    101             case 270:
    102                 mChild.setTranslationX(w);
    103                 mChild.setTranslationY(0);
    104                 break;
    105         }
    106         mChild.setRotation(-mOrientation);
    107     }
    108 
    109     @Override
    110     public boolean shouldDelayChildPressedState() {
    111         return false;
    112     }
    113 
    114     // Rotate the view counter-clockwise
    115     @Override
    116     public void setOrientation(int orientation, boolean animation) {
    117         orientation = orientation % 360;
    118         if (mOrientation == orientation) return;
    119         mOrientation = orientation;
    120         requestLayout();
    121     }
    122 
    123     public int getOrientation() {
    124         return mOrientation;
    125     }
    126 }
    127