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.graphics.Color;
  import android.graphics.PorterDuff;
  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 ColorDialogPreference extends DialogPreference
      implements SeekBar.OnSeekBarChangeListener {
    public interface ValueProxy {
      int readValue(final String key);
  
      void writeDefaultValue(final String key);
  
      void writeValue(final int value, final String key);
    }
  
    private TextView mValueView;
    private SeekBar mSeekBarRed;
    private SeekBar mSeekBarGreen;
    private SeekBar mSeekBarBlue;
  
    private ValueProxy mValueProxy;
  
    public ColorDialogPreference(final Context context, final AttributeSet attrs) {
      super(context, attrs);
      setDialogLayoutResource(R.layout.color_dialog);
    }
  
    public void setInterface(final ValueProxy proxy) {
      mValueProxy = proxy;
    }
  
    @Override
    protected View onCreateDialogView() {
      final View view = super.onCreateDialogView();
      mSeekBarRed = view.findViewById(R.id.seek_bar_dialog_bar_red);
      mSeekBarRed.setMax(255);
      mSeekBarRed.setOnSeekBarChangeListener(this);
      mSeekBarRed.getProgressDrawable().setColorFilter(Color.RED, PorterDuff.Mode.SRC_IN);
      mSeekBarRed.getThumb().setColorFilter(Color.RED, PorterDuff.Mode.SRC_IN);
      mSeekBarGreen = view.findViewById(R.id.seek_bar_dialog_bar_green);
      mSeekBarGreen.setMax(255);
      mSeekBarGreen.setOnSeekBarChangeListener(this);
      mSeekBarGreen.getThumb().setColorFilter(Color.GREEN, PorterDuff.Mode.SRC_IN);
      mSeekBarGreen.getProgressDrawable().setColorFilter(Color.GREEN, PorterDuff.Mode.SRC_IN);
      mSeekBarBlue = view.findViewById(R.id.seek_bar_dialog_bar_blue);
      mSeekBarBlue.setMax(255);
      mSeekBarBlue.setOnSeekBarChangeListener(this);
      mSeekBarBlue.getThumb().setColorFilter(Color.BLUE, PorterDuff.Mode.SRC_IN);
      mSeekBarBlue.getProgressDrawable().setColorFilter(Color.BLUE, PorterDuff.Mode.SRC_IN);
      mValueView = view.findViewById(R.id.seek_bar_dialog_value);
      return view;
    }
  
    @Override
    protected void onBindDialogView(final View view) {
      final int color = mValueProxy.readValue(getKey());
      mSeekBarRed.setProgress(Color.red(color));
      mSeekBarGreen.setProgress(Color.green(color));
      mSeekBarBlue.setProgress(Color.blue(color));
      setHeaderText(color);
    }
  
    @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_POSITIVE) {
        super.onClick(dialog, which);
        final int value = Color.rgb(
            mSeekBarRed.getProgress(),
            mSeekBarGreen.getProgress(),
            mSeekBarBlue.getProgress());
        mValueProxy.writeValue(value, key);
        return;
      }
      if (which == DialogInterface.BUTTON_NEUTRAL) {
        super.onClick(dialog, which);
        mValueProxy.writeDefaultValue(key);
        return;
      }
    }
  
    @Override
    public void onProgressChanged(final SeekBar seekBar, final int progress,
                                  final boolean fromUser) {
      int color = Color.rgb(
          mSeekBarRed.getProgress(),
          mSeekBarGreen.getProgress(),
          mSeekBarBlue.getProgress());
      setHeaderText(color);
      if (!fromUser) {
        seekBar.setProgress(progress);
      }
    }
  
    @Override
    public void onStartTrackingTouch(SeekBar seekBar) {
    }
  
    @Override
    public void onStopTrackingTouch(SeekBar seekBar) {
    }
  
    private void setHeaderText(int color) {
      mValueView.setText(getValueText(color));
      boolean bright = Color.red(color) + Color.green(color) + Color.blue(color) > 128 * 3;
      mValueView.setTextColor(bright ? Color.BLACK : Color.WHITE);
      mValueView.setBackgroundColor(color);
    }
  
    private String getValueText(final int value) {
      String temp = Integer.toHexString(value);
      for (; temp.length() < 8; temp = "0" + temp) ;
      return temp.substring(2).toUpperCase();
    }
  }
  