1 /*
2  * Copyright (C) 2015 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.musicfx;
18 
19 import android.content.Context;
20 import android.util.AttributeSet;
21 import android.util.Log;
22 import android.view.View;
23 import android.view.ViewGroup;
24 
25 
26 /*
27  *  This ViewGroup contains a single view, which will be rotated by 90 degrees counterclockwise.
28  */
29 
30 public class SeekBarRotator extends ViewGroup {
31 
32 
SeekBarRotator(Context context)33     public SeekBarRotator(Context context) {
34         super(context);
35     }
36 
SeekBarRotator(Context context, AttributeSet attrs)37     public SeekBarRotator(Context context, AttributeSet attrs) {
38         super(context, attrs);
39     }
40 
SeekBarRotator(Context context, AttributeSet attrs, int defStyleAttr)41     public SeekBarRotator(Context context, AttributeSet attrs, int defStyleAttr) {
42         super(context, attrs, defStyleAttr);
43     }
44 
SeekBarRotator(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes)45     public SeekBarRotator(Context context, AttributeSet attrs, int defStyleAttr,
46             int defStyleRes) {
47         super(context, attrs, defStyleAttr, defStyleRes);
48     }
49 
50     @Override
onMeasure(int widthMeasureSpec, int heightMeasureSpec)51     protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
52         final View child = getChildAt(0);
53 
54         if (child.getVisibility() != GONE) {
55             // swap width and height for child
56             measureChild(child, heightMeasureSpec, widthMeasureSpec);
57             setMeasuredDimension(
58                     child.getMeasuredHeightAndState(),
59                     child.getMeasuredWidthAndState());
60         } else {
61             setMeasuredDimension(
62                     resolveSizeAndState(0, widthMeasureSpec, 0),
63                     resolveSizeAndState(0, heightMeasureSpec, 0));
64         }
65     }
66 
67     @Override
onLayout(boolean changed, int l, int t, int r, int b)68     protected void onLayout(boolean changed, int l, int t, int r, int b) {
69         final View child = getChildAt(0);
70 
71         if (child.getVisibility() != GONE) {
72             // rotate the child 90 degrees counterclockwise around its upper-left
73             child.setPivotX(0);
74             child.setPivotY(0);
75             child.setRotation(-90);
76 
77             // place the child below this view, so it rotates into view
78             int mywidth = r - l;
79             int myheight = b - t;
80             int childwidth = myheight;
81             int childheight = mywidth;
82 
83             child.layout(0, myheight, childwidth, myheight + childheight);
84         }
85     }
86 
87 }
88