content: /*
   * Copyright (C) 2013 The Android Open Source Project
   *
   * 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 com.amnesica.kryptey.inputmethod.latin.settings;
  
  import android.app.AlertDialog;
  import android.content.Context;
  import android.content.DialogInterface;
  import android.content.res.TypedArray;
  import android.preference.DialogPreference;
  import android.util.AttributeSet;
  import android.view.View;
  import android.widget.SeekBar;
  import android.widget.TextView;
  
  import com.amnesica.kryptey.inputmethod.R;
  
  public final class SeekBarDialogPreference extends DialogPreference
      implements SeekBar.OnSeekBarChangeListener {
    public interface ValueProxy {
      int readValue(final String key);
  
      int readDefaultValue(final String key);
  
      void writeValue(final int value, final String key);
  
      void writeDefaultValue(final String key);
  
      String getValueText(final int value);
  
      void feedbackValue(final int value);
    }
  
    private final int mMaxValue;
    private final int mMinValue;
    private final int mStepValue;
  
    private TextView mValueView;
    private SeekBar mSeekBar;
  
    private ValueProxy mValueProxy;
  
    public SeekBarDialogPreference(final Context context, final AttributeSet attrs) {
      super(context, attrs);
      final TypedArray a = context.obtainStyledAttributes(
          attrs, R.styleable.SeekBarDialogPreference, 0, 0);
      mMaxValue = a.getInt(R.styleable.SeekBarDialogPreference_maxValue, 0);
      mMinValue = a.getInt(R.styleable.SeekBarDialogPreference_minValue, 0);
      mStepValue = a.getInt(R.styleable.SeekBarDialogPreference_stepValue, 0);
      a.recycle();
      setDialogLayoutResource(R.layout.seek_bar_dialog);
    }
  
    public void setInterface(final ValueProxy proxy) {
      mValueProxy = proxy;
      final int value = mValueProxy.readValue(getKey());
      setSummary(mValueProxy.getValueText(value));
    }
  
    @Override
    protected View onCreateDialogView() {
      final View view = super.onCreateDialogView();
      mSeekBar = view.findViewById(R.id.seek_bar_dialog_bar);
      mSeekBar.setMax(mMaxValue - mMinValue);
      mSeekBar.setOnSeekBarChangeListener(this);
      mValueView = view.findViewById(R.id.seek_bar_dialog_value);
      return view;
    }
  
    private int getProgressFromValue(final int value) {
      return value - mMinValue;
    }
  
    private int getValueFromProgress(final int progress) {
      return progress + mMinValue;
    }
  
    private int clipValue(final int value) {
      final int clippedValue = Math.min(mMaxValue, Math.max(mMinValue, value));
      if (mStepValue <= 1) {
        return clippedValue;
      }
      return clippedValue - (clippedValue % mStepValue);
    }
  
    private int getClippedValueFromProgress(final int progress) {
      return clipValue(getValueFromProgress(progress));
    }
  
    @Override
    protected void onBindDialogView(final View view) {
      final int value = mValueProxy.readValue(getKey());
      mValueView.setText(mValueProxy.getValueText(value));
      mSeekBar.setProgress(getProgressFromValue(clipValue(value)));
    }
  
    @Override
    protected void onPrepareDialogBuilder(final AlertDialog.Builder builder) {
      builder.setPositiveButton(android.R.string.ok, this)
          .setNegativeButton(android.R.string.cancel, this)
          .setNeutralButton(R.string.button_default, this);
    }
  
    @Override
    public void onClick(final DialogInterface dialog, final int which) {
      super.onClick(dialog, which);
      final String key = getKey();
      if (which == DialogInterface.BUTTON_NEUTRAL) {
        final int value = mValueProxy.readDefaultValue(key);
        setSummary(mValueProxy.getValueText(value));
        mValueProxy.writeDefaultValue(key);
        return;
      }
      if (which == DialogInterface.BUTTON_POSITIVE) {
        final int value = getClippedValueFromProgress(mSeekBar.getProgress());
        setSummary(mValueProxy.getValueText(value));
        mValueProxy.writeValue(value, key);
        return;
      }
    }
  
    @Override
    public void onProgressChanged(final SeekBar seekBar, final int progress,
                                  final boolean fromUser) {
      final int value = getClippedValueFromProgress(progress);
      mValueView.setText(mValueProxy.getValueText(value));
      if (!fromUser) {
        mSeekBar.setProgress(getProgressFromValue(value));
      }
    }
  
    @Override
    public void onStartTrackingTouch(final SeekBar seekBar) {
    }
  
    @Override
    public void onStopTrackingTouch(final SeekBar seekBar) {
      mValueProxy.feedbackValue(getClippedValueFromProgress(seekBar.getProgress()));
    }
  }
  