fedilab-Android-App/colorPicker/src/main/java/com/jaredrummler/android/colorpicker/ColorPreferenceCompat.java

package com.jaredrummler.android.colorpicker;

import android.content.Context;
import android.content.ContextWrapper;
import android.content.res.TypedArray;
import android.graphics.Color;
import android.util.AttributeSet;

import androidx.annotation.ColorInt;
import androidx.annotation.NonNull;
import androidx.fragment.app.FragmentActivity;
import androidx.preference.Preference;
import androidx.preference.PreferenceViewHolder;

/**
 * A Preference to select a color
 */
public class ColorPreferenceCompat extends Preference implements ColorPickerDialogListener {

  private static final int SIZE_NORMAL = 0;
  private static final int SIZE_LARGE = 1;

  private OnShowDialogListener onShowDialogListener;
  private int color = Color.BLACK;
  private boolean showDialog;
  @ColorPickerDialog.DialogType
  private int dialogType;
  private int colorShape;
  private boolean allowPresets;
  private boolean allowCustom;
  private boolean showAlphaSlider;
  private boolean showColorShades;
  private int previewSize;
  private int[] presets;
  private int dialogTitle;

  public ColorPreferenceCompat(Context context, AttributeSet attrs) {
    super(context, attrs);
    init(attrs);
  }

  public ColorPreferenceCompat(Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs, defStyle);
    init(attrs);
  }

  private void init(AttributeSet attrs) {
    setPersistent(true);
    TypedArray a = getContext().obtainStyledAttributes(attrs, R.styleable.ColorPreference);
    showDialog = a.getBoolean(R.styleable.ColorPreference_cpv_showDialog, true);
    //noinspection WrongConstant
    dialogType = a.getInt(R.styleable.ColorPreference_cpv_dialogType, ColorPickerDialog.TYPE_PRESETS);
    colorShape = a.getInt(R.styleable.ColorPreference_cpv_colorShape, ColorShape.CIRCLE);
    allowPresets = a.getBoolean(R.styleable.ColorPreference_cpv_allowPresets, true);
    allowCustom = a.getBoolean(R.styleable.ColorPreference_cpv_allowCustom, true);
    showAlphaSlider = a.getBoolean(R.styleable.ColorPreference_cpv_showAlphaSlider, false);
    showColorShades = a.getBoolean(R.styleable.ColorPreference_cpv_showColorShades, true);
    previewSize = a.getInt(R.styleable.ColorPreference_cpv_previewSize, SIZE_NORMAL);
    final int presetsResId = a.getResourceId(R.styleable.ColorPreference_cpv_colorPresets, 0);
    dialogTitle = a.getResourceId(R.styleable.ColorPreference_cpv_dialogTitle, R.string.cpv_default_title);
    if (presetsResId != 0) {
      presets = getContext().getResources().getIntArray(presetsResId);
    } else {
      presets = ColorPickerDialog.MATERIAL_COLORS;
    }
    if (colorShape == ColorShape.CIRCLE) {
      setWidgetLayoutResource(
              previewSize == SIZE_LARGE ? R.layout.cpv_preference_circle_large : R.layout.cpv_preference_circle);
    } else {
      setWidgetLayoutResource(
              previewSize == SIZE_LARGE ? R.layout.cpv_preference_square_large : R.layout.cpv_preference_square);
    }
    a.recycle();
  }

  @Override
  protected void onClick() {
    super.onClick();
    if (onShowDialogListener != null) {
      onShowDialogListener.onShowColorPickerDialog((String) getTitle(), color);
    } else if (showDialog) {
      ColorPickerDialog dialog = ColorPickerDialog.newBuilder()
              .setDialogType(dialogType)
              .setDialogTitle(dialogTitle)
              .setColorShape(colorShape)
              .setPresets(presets)
              .setAllowPresets(allowPresets)
              .setAllowCustom(allowCustom)
              .setShowAlphaSlider(showAlphaSlider)
              .setShowColorShades(showColorShades)
              .setColor(color)
              .create();
      dialog.setColorPickerDialogListener(this);
      getActivity().getSupportFragmentManager()
              .beginTransaction()
              .add(dialog, getFragmentTag())
              .commitAllowingStateLoss();
    }
  }

  public FragmentActivity getActivity() {
    Context context = getContext();
    if (context instanceof FragmentActivity) {
      return (FragmentActivity) context;
    } else if (context instanceof ContextWrapper) {
      Context baseContext = ((ContextWrapper) context).getBaseContext();
      if (baseContext instanceof FragmentActivity) {
        return (FragmentActivity) baseContext;
      }
    }
    throw new IllegalStateException("Error getting activity from context");
  }

  @Override
  public void onAttached() {
    super.onAttached();
    if (showDialog) {
      ColorPickerDialog fragment =
              (ColorPickerDialog) getActivity().getSupportFragmentManager().findFragmentByTag(getFragmentTag());
      if (fragment != null) {
        // re-bind preference to fragment
        fragment.setColorPickerDialogListener(this);
      }
    }
  }

  @Override
  public void onBindViewHolder(PreferenceViewHolder holder) {
    super.onBindViewHolder(holder);
    ColorPanelView preview = holder.itemView.findViewById(R.id.cpv_preference_preview_color_panel);
    if (preview != null) {
      preview.setColor(color);
    }
  }

  @Override
  protected void onSetInitialValue(Object defaultValue) {
    super.onSetInitialValue(defaultValue);
    if (defaultValue instanceof Integer) {
      color = (Integer) defaultValue;
      persistInt(color);
    } else {
      color = getPersistedInt(0xFF000000);
    }
  }

  @Override
  protected Object onGetDefaultValue(TypedArray a, int index) {
    return a.getInteger(index, Color.BLACK);
  }

  @Override
  public void onColorSelected(int dialogId, @ColorInt int color) {
    saveValue(color);
  }

  @Override
  public void onDialogDismissed(int dialogId) {
    // no-op
  }

  /**
   * Set the new color
   *
   * @param color The newly selected color
   */
  public void saveValue(@ColorInt int color) {
    this.color = color;
    persistInt(this.color);
    notifyChanged();
    callChangeListener(color);
  }

  /**
   * Get the colors that will be shown in the {@link ColorPickerDialog}.
   *
   * @return An array of color ints
   */
  public int[] getPresets() {
    return presets;
  }

  /**
   * Set the colors shown in the {@link ColorPickerDialog}.
   *
   * @param presets An array of color ints
   */
  public void setPresets(@NonNull int[] presets) {
    this.presets = presets;
  }

  /**
   * The listener used for showing the {@link ColorPickerDialog}.
   * Call {@link #saveValue(int)} after the user chooses a color.
   * If this is set then it is up to you to show the dialog.
   *
   * @param listener The listener to show the dialog
   */
  public void setOnShowDialogListener(OnShowDialogListener listener) {
    onShowDialogListener = listener;
  }

  /**
   * Get the color of the key. This should be one of the entries in {@link #getPresets()}.
   *
   * @return The color of the key
   */
  public int getColor() {
    return color;
  }

  /**
   * Sets the color selected. This should be one of the entries in {@link #getPresets()}.
   *
   * @param color The color to set for the key
   */
  public void setColor(@ColorInt int color) {
    this.color = color;
  }

  /**
   * The tag used for the {@link ColorPickerDialog}.
   *
   * @return The tag
   */
  public String getFragmentTag() {
    return "color_" + getKey();
  }

  public interface OnShowDialogListener {

    void onShowColorPickerDialog(String title, int currentColor);
  }
}