sdk/sources/android-23/com/android/example/rscamera/VerticalSeekBar.java

   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 }