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/* -*- Mode: java; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* xscreensaver, Copyright (c) 2016 Jamie Zawinski <jwz@jwz.org>
*
* Permission to use, copy, modify, distribute, and sell this software and its
* documentation for any purpose is hereby granted without fee, provided that
* the above copyright notice appear in all copies and that both that
* copyright notice and this permission notice appear in supporting
* documentation. No representations are made about the suitability of this
* software for any purpose. It is provided "as is" without express or
* implied warranty.
*
* A numeric preference as a slider, inline in the preferences list.
* XML options include:
*
* low, high (floats) -- smallest and largest allowed values.
* If low > high, the value increases as the slider's thumb moves left.
*
* lowLabel, highLabel (strings) -- labels shown at the left and right
* ends of the slider.
*
* integral (boolean) -- whether to use whole numbers instead of floats;
*/
package org.jwz.xscreensaver;
import android.content.Context;
import android.content.res.TypedArray;
import android.content.res.Resources;
import android.preference.Preference;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;
import android.widget.SeekBar;
import android.widget.TextView;
import android.util.Log;
public class SliderPreference extends Preference {
protected float low, high;
protected String low_label, high_label;
protected boolean integral;
protected float mValue;
protected int seekbar_ticks;
public SliderPreference(Context context, AttributeSet attrs) {
this (context, attrs, 0);
}
public SliderPreference (Context context, AttributeSet attrs, int defStyle) {
super (context, attrs, defStyle);
Resources res = context.getResources();
// Parse these from the "<SliderPreference>" tag
low = Float.parseFloat (attrs.getAttributeValue (null, "low"));
high = Float.parseFloat (attrs.getAttributeValue (null, "high"));
integral = attrs.getAttributeBooleanValue (null, "integral", false);
low_label = res.getString(
attrs.getAttributeResourceValue (null, "lowLabel", 0));
high_label = res.getString(
attrs.getAttributeResourceValue (null, "highLabel", 0));
seekbar_ticks = (integral
? (int) Math.floor (Math.abs (high - low))
: 100000);
setWidgetLayoutResource (R.layout.slider_preference);
}
@Override
protected void onSetInitialValue (boolean restore, Object def) {
if (restore) {
mValue = getPersistedFloat (low);
} else {
mValue = (Float) def;
persistFloat (mValue);
}
//Log.d("xscreensaver", String.format("SLIDER INIT %s: %f",
// low_label, mValue));
}
@Override
protected Object onGetDefaultValue(TypedArray a, int index) {
return a.getFloat (index, low);
}
public float getValue() {
return mValue;
}
public void setValue (float value) {
if (low < high) {
value = Math.max (low, Math.min (high, value));
} else {
value = Math.max (high, Math.min (low, value));
}
if (integral)
value = Math.round (value);
if (value != mValue) {
//Log.d("xscreensaver", String.format("SLIDER %s: %f", low_label, value));
persistFloat (value);
mValue = value;
notifyChanged();
}
}
@Override
protected View onCreateView (ViewGroup parent) {
View view = super.onCreateView(parent);
TextView low_view = (TextView)
view.findViewById (R.id.slider_preference_low);
low_view.setText (low_label);
TextView high_view = (TextView)
view.findViewById (R.id.slider_preference_high);
high_view.setText (high_label);
SeekBar seekbar = (SeekBar)
view.findViewById (R.id.slider_preference_seekbar);
seekbar.setMax (seekbar_ticks);
float ratio = (mValue - low) / (high - low);
int seek_value = (int) (ratio * (float) seekbar_ticks);
seekbar.setProgress (seek_value);
final SliderPreference slider = this;
seekbar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
}
@Override
public void onProgressChanged (SeekBar seekBar, int progress,
boolean fromUser) {
if (fromUser) {
float ratio = (float) progress / (float) seekbar_ticks;
float value = low + (ratio * (high - low));
slider.setValue (value);
callChangeListener (progress);
}
}
});
return view;
}
}
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