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/*
This file is part of Subsonic.
Subsonic is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Subsonic is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Subsonic. If not, see <http://www.gnu.org/licenses/>.
Copyright 2009 (C) Sindre Mehus
*/
package net.sourceforge.subsonic.androidapp.util;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.widget.ProgressBar;
import net.sourceforge.subsonic.androidapp.R;
/**
* @author Sindre Mehus
* @version $Id$
*/
public class HorizontalSlider extends ProgressBar {
private final Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.slider_knob);
private boolean slidingEnabled;
private OnSliderChangeListener listener;
private static final int PADDING = 2;
private boolean sliding;
private int sliderPosition;
private int startPosition;
public interface OnSliderChangeListener {
void onSliderChanged(View view, int position, boolean inProgress);
}
public HorizontalSlider(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
public HorizontalSlider(Context context, AttributeSet attrs) {
super(context, attrs, android.R.attr.progressBarStyleHorizontal);
}
public HorizontalSlider(Context context) {
super(context);
}
public void setSlidingEnabled(boolean slidingEnabled) {
if (this.slidingEnabled != slidingEnabled) {
this.slidingEnabled = slidingEnabled;
invalidate();
}
}
public boolean isSlidingEnabled() {
return slidingEnabled;
}
public void setOnSliderChangeListener(OnSliderChangeListener listener) {
this.listener = listener;
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
int max = getMax();
if (!slidingEnabled || max == 0) {
return;
}
int paddingLeft = getPaddingLeft();
int paddingRight = getPaddingRight();
int paddingTop = getPaddingTop();
int paddingBottom = getPaddingBottom();
int w = getWidth() - paddingLeft - paddingRight;
int h = getHeight() - paddingTop - paddingBottom;
int position = sliding ? sliderPosition : getProgress();
int bitmapWidth = bitmap.getWidth();
int bitmapHeight = bitmap.getWidth();
float x = paddingLeft + w * ((float) position / max) - bitmapWidth / 2.0F;
x = Math.max(x, paddingLeft);
x = Math.min(x, paddingLeft + w - bitmapWidth);
float y = paddingTop + h / 2.0F - bitmapHeight / 2.0F;
canvas.drawBitmap(bitmap, x, y, null);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
if (!slidingEnabled) {
return false;
}
int action = event.getAction();
if (action == MotionEvent.ACTION_DOWN || action == MotionEvent.ACTION_MOVE) {
if (action == MotionEvent.ACTION_DOWN) {
sliding = true;
startPosition = getProgress();
}
float x = event.getX() - PADDING;
float width = getWidth() - 2 * PADDING;
sliderPosition = Math.round((float) getMax() * (x / width));
sliderPosition = Math.max(sliderPosition, 0);
setProgress(Math.min(startPosition, sliderPosition));
setSecondaryProgress(Math.max(startPosition, sliderPosition));
if (listener != null) {
listener.onSliderChanged(this, sliderPosition, true);
}
} else if (action == MotionEvent.ACTION_UP) {
sliding = false;
setProgress(sliderPosition);
setSecondaryProgress(0);
if (listener != null) {
listener.onSliderChanged(this, sliderPosition, false);
}
}
return true;
}
}
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