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      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.example.rscamera;
     18 
     19 import android.content.Context;
     20 import android.graphics.Canvas;
     21 import android.util.AttributeSet;
     22 import android.view.MotionEvent;
     23 import android.widget.SeekBar;
     24 
     25 /**
     26  * Class to create a vertical slider
     27  */
     28 public class VerticalSeekBar extends SeekBar {
     29 
     30     public VerticalSeekBar(Context context) {
     31         super(context);
     32     }
     33 
     34     public VerticalSeekBar(Context context, AttributeSet attrs, int defStyle) {
     35         super(context, attrs, defStyle);
     36     }
     37 
     38     public VerticalSeekBar(Context context, AttributeSet attrs) {
     39         super(context, attrs);
     40     }
     41 
     42     protected void onSizeChanged(int w, int h, int oldw, int oldh) {
     43         super.onSizeChanged(h, w, oldh, oldw);
     44     }
     45 
     46     @Override
     47     protected synchronized void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
     48         super.onMeasure(heightMeasureSpec, widthMeasureSpec);
     49         setMeasuredDimension(getMeasuredHeight(), getMeasuredWidth());
     50     }
     51 
     52     protected void onDraw(Canvas c) {
     53         c.rotate(-90);
     54         c.translate(-getHeight(), 0);
     55 
     56         super.onDraw(c);
     57     }
     58 
     59     @Override
     60     public boolean onTouchEvent(MotionEvent event) {
     61         if (!isEnabled()) {
     62             return false;
     63         }
     64 
     65         switch (event.getAction()) {
     66             case MotionEvent.ACTION_DOWN:
     67             case MotionEvent.ACTION_MOVE:
     68             case MotionEvent.ACTION_UP:
     69                 setProgress(getMax() - (int) (getMax() * event.getY() / getHeight()));
     70                 onSizeChanged(getWidth(), getHeight(), 0, 0);
     71                 break;
     72 
     73             case MotionEvent.ACTION_CANCEL:
     74                 break;
     75         }
     76         return true;
     77     }
     78 }