1 /* 2 * Copyright (C) 2017 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.settings.widget; 18 19 import android.content.Context; 20 import android.graphics.Canvas; 21 import android.graphics.drawable.Drawable; 22 import android.util.AttributeSet; 23 import android.widget.SeekBar; 24 25 public class DefaultIndicatorSeekBar extends SeekBar { 26 27 private int mDefaultProgress = -1; 28 DefaultIndicatorSeekBar(Context context)29 public DefaultIndicatorSeekBar(Context context) { 30 super(context); 31 } 32 DefaultIndicatorSeekBar(Context context, AttributeSet attrs)33 public DefaultIndicatorSeekBar(Context context, AttributeSet attrs) { 34 super(context, attrs); 35 } 36 DefaultIndicatorSeekBar(Context context, AttributeSet attrs, int defStyleAttr)37 public DefaultIndicatorSeekBar(Context context, AttributeSet attrs, int defStyleAttr) { 38 super(context, attrs, defStyleAttr); 39 } 40 DefaultIndicatorSeekBar(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes)41 public DefaultIndicatorSeekBar(Context context, AttributeSet attrs, int defStyleAttr, 42 int defStyleRes) { 43 super(context, attrs, defStyleAttr, defStyleRes); 44 } 45 46 /** 47 * N.B. Only draws the default indicator tick mark, NOT equally spaced tick marks. 48 */ 49 @Override drawTickMarks(Canvas canvas)50 protected void drawTickMarks(Canvas canvas) { 51 if (isEnabled() && mDefaultProgress <= getMax() && mDefaultProgress >= getMin()) { 52 final Drawable defaultIndicator = getTickMark(); 53 54 // Adjust the drawable's bounds to center it at the point where it's drawn. 55 final int w = defaultIndicator.getIntrinsicWidth(); 56 final int h = defaultIndicator.getIntrinsicHeight(); 57 final int halfW = w >= 0 ? w / 2 : 1; 58 final int halfH = h >= 0 ? h / 2 : 1; 59 defaultIndicator.setBounds(-halfW, -halfH, halfW, halfH); 60 61 // This mimics the computation of the thumb position, to get the true "default." 62 final int availableWidth = getWidth() - mPaddingLeft - mPaddingRight; 63 final int range = getMax() - getMin(); 64 final float scale = range > 0f ? mDefaultProgress / (float) range : 0f; 65 final int offset = (int) ((scale * availableWidth) + 0.5f); 66 final int indicatorPosition = isLayoutRtl() && getMirrorForRtl() 67 ? availableWidth - offset + mPaddingRight : offset + mPaddingLeft; 68 69 final int saveCount = canvas.save(); 70 canvas.translate(indicatorPosition, getHeight() / 2); 71 defaultIndicator.draw(canvas); 72 canvas.restoreToCount(saveCount); 73 } 74 } 75 76 /** 77 * N.B. This sets the default *unadjusted* progress, i.e. in the SeekBar's [0 - max] terms. 78 */ setDefaultProgress(int defaultProgress)79 public void setDefaultProgress(int defaultProgress) { 80 if (mDefaultProgress != defaultProgress) { 81 mDefaultProgress = defaultProgress; 82 invalidate(); 83 } 84 } 85 getDefaultProgress()86 public int getDefaultProgress() { 87 return mDefaultProgress; 88 } 89 } 90