Android Open Source - android_glsl Glsl Slider Preference

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License

The source code is released under:

Apache License

Java Source Code

/*
   Copyright 2011 Harri Sm?tt/*from   ww w.  ja v a  2 s.co m*/

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
 */

package fi.harism.glsl.prefs;

import android.content.Context;
import android.content.res.TypedArray;
import android.preference.DialogPreference;
import android.util.AttributeSet;
import android.view.View;
import android.widget.SeekBar;
import fi.harism.glsl.R;

/**
 * GlslSliderPreference, float preference with adjustable slider.
 */
public class GlslSliderPreference extends DialogPreference {

  // Preference title.
  private String mTitle;

  // Current value.
  private float mValue;
  // Minimum value.
  private float mValueMin;
  // Maximum value.
  private float mValueMax;
  // Value precision.
  private float mValuePrecision;

  /**
   * Constructor.
   * 
   * @param context
   * @param attrs
   */
  public GlslSliderPreference(Context context, AttributeSet attrs) {
    this(context, attrs, 0);
  }

  /**
   * Constructor.
   * 
   * @param context
   * @param attrs
   * @param defStyle
   */
  public GlslSliderPreference(Context context, AttributeSet attrs,
      int defStyle) {
    super(context, attrs, defStyle);

    // Get values from preferences xml.
    TypedArray ta = context.obtainStyledAttributes(attrs,
        R.styleable.SliderPreference);
    mValueMin = ta.getFloat(R.styleable.SliderPreference_valueMin, 0);
    mValueMax = ta.getFloat(R.styleable.SliderPreference_valueMax, 100);
    mValuePrecision = ta.getFloat(
        R.styleable.SliderPreference_valuePrecision, 1);

    // Store original title for later use.
    mTitle = getTitle().toString();
    setDialogLayoutResource(R.layout.slider);
  }

  /**
   * Updates title with value in mValue.
   */
  private void updateTitle() {
    String title = String.format(mTitle, mValue);
    setTitle(title);
    setDialogTitle(title);
    if (getDialog() != null) {
      getDialog().setTitle(title);
    }
  }

  @Override
  protected void onBindDialogView(View v) {
    super.onBindDialogView(v);
    // Set seek bar values.
    SeekBar seekBar = (SeekBar) v.findViewById(R.id.slider);
    seekBar.setMax((int) ((mValueMax - mValueMin) / mValuePrecision));
    seekBar.setProgress((int) ((mValue - mValueMin) / mValuePrecision));
    seekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
      @Override
      public void onProgressChanged(SeekBar sb, int newValue,
          boolean fromUser) {
        mValue = (newValue * mValuePrecision) + mValueMin;
        updateTitle();
      }

      @Override
      public void onStartTrackingTouch(SeekBar sb) {
      }

      @Override
      public void onStopTrackingTouch(SeekBar sb) {
      }
    });
  }

  @Override
  protected void onDialogClosed(boolean positiveResult) {
    persistFloat(mValue);
  }

  @Override
  protected Object onGetDefaultValue(TypedArray attrs, int index) {
    return attrs.getFloat(index, 0);
  }

  @Override
  protected void onSetInitialValue(boolean restorePersistedValue,
      Object defaultValue) {
    if (restorePersistedValue) {
      mValue = getPersistedFloat(0);
    } else {
      mValue = (Float) defaultValue;
      persistFloat(mValue);
    }
    updateTitle();
  }

}

Java Source Code List

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