SeekBar.java revision 1029866a12e04e9db52485e2ec0353e764d15549
19066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project/* 29066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Copyright (C) 2006 The Android Open Source Project 39066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 49066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Licensed under the Apache License, Version 2.0 (the "License"); 59066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * you may not use this file except in compliance with the License. 69066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * You may obtain a copy of the License at 79066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 89066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * http://www.apache.org/licenses/LICENSE-2.0 99066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Unless required by applicable law or agreed to in writing, software 119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * distributed under the License is distributed on an "AS IS" BASIS, 129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * See the License for the specific language governing permissions and 149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * limitations under the License. 159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectpackage android.widget; 189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.content.Context; 209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.util.AttributeSet; 219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project/** 259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * A SeekBar is an extension of ProgressBar that adds a draggable thumb. The user can touch 269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * the thumb and drag left or right to set the current progress level or use the arrow keys. 279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Placing focusable widgets to the left or right of a SeekBar is discouraged. 289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p> 299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Clients of the SeekBar can attach a {@link SeekBar.OnSeekBarChangeListener} to 309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * be notified of the user's actions. 319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @attr ref android.R.styleable#SeekBar_thumb 339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectpublic class SeekBar extends AbsSeekBar { 359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * A callback that notifies clients when the progress level has been 389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * changed. This includes changes that were initiated by the user through a 399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * touch gesture or arrow key/trackball as well as changes that were initiated 409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * programmatically. 419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public interface OnSeekBarChangeListener { 439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Notification that the progress level has changed. Clients can use the fromUser parameter 469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * to distinguish user-initiated changes from those that occurred programmatically. 479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param seekBar The SeekBar whose progress has changed 499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param progress The current progress level. This will be in the range 0..max where max 509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * was set by {@link ProgressBar#setMax(int)}. (The default value for max is 100.) 519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param fromUser True if the progress change was initiated by the user. 529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser); 549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Notification that the user has started a touch gesture. Clients may want to use this 579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * to disable advancing the seekbar. 589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param seekBar The SeekBar in which the touch gesture began 599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project void onStartTrackingTouch(SeekBar seekBar); 619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Notification that the user has finished a touch gesture. Clients may want to use this 649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * to re-enable advancing the seekbar. 659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param seekBar The SeekBar in which the touch gesture began 669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project void onStopTrackingTouch(SeekBar seekBar); 689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private OnSeekBarChangeListener mOnSeekBarChangeListener; 719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public SeekBar(Context context) { 739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project this(context, null); 749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public SeekBar(Context context, AttributeSet attrs) { 779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project this(context, attrs, com.android.internal.R.attr.seekBarStyle); 789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public SeekBar(Context context, AttributeSet attrs, int defStyle) { 819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super(context, attrs, defStyle); 829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project void onProgressRefresh(float scale, boolean fromUser) { 869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.onProgressRefresh(scale, fromUser); 879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mOnSeekBarChangeListener != null) { 899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mOnSeekBarChangeListener.onProgressChanged(this, getProgress(), fromUser); 909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Sets a listener to receive notifications of changes to the SeekBar's progress level. Also 959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * provides notifications of when the user starts and stops a touch gesture within the SeekBar. 969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param l The seek bar notification listener 989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @see SeekBar.OnSeekBarChangeListener 1009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void setOnSeekBarChangeListener(OnSeekBarChangeListener l) { 1029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mOnSeekBarChangeListener = l; 1039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 1069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project void onStartTrackingTouch() { 1071029866a12e04e9db52485e2ec0353e764d15549Adam Powell super.onStartTrackingTouch(); 1089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mOnSeekBarChangeListener != null) { 1099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mOnSeekBarChangeListener.onStartTrackingTouch(this); 1109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 1149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project void onStopTrackingTouch() { 1151029866a12e04e9db52485e2ec0353e764d15549Adam Powell super.onStopTrackingTouch(); 1169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mOnSeekBarChangeListener != null) { 1179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mOnSeekBarChangeListener.onStopTrackingTouch(this); 1189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project} 122