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

/*
 * Copyright (C) 2017 Jared Rummler
 *
 * 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.jaredrummler.android.colorpicker;

import android.content.Context;
import android.graphics.Color;
import android.graphics.PorterDuff;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;

import androidx.core.graphics.ColorUtils;

class ColorPaletteAdapter extends BaseAdapter {

    /*package*/ final OnColorSelectedListener listener;
    /*package*/ final int[] colors;
    /*package*/ int selectedPosition;
    /*package*/ int colorShape;

    ColorPaletteAdapter(OnColorSelectedListener listener, int[] colors, int selectedPosition,
                        @ColorShape int colorShape) {
        this.listener = listener;
        this.colors = colors;
        this.selectedPosition = selectedPosition;
        this.colorShape = colorShape;
    }

    @Override
    public int getCount() {
        return colors.length;
    }

    @Override
    public Object getItem(int position) {
        return colors[position];
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        final ViewHolder holder;
        if (convertView == null) {
            holder = new ViewHolder(parent.getContext());
            convertView = holder.view;
        } else {
            holder = (ViewHolder) convertView.getTag();
        }
        holder.setup(position);
        return convertView;
    }

    void selectNone() {
        selectedPosition = -1;
        notifyDataSetChanged();
    }

    interface OnColorSelectedListener {

        void onColorSelected(int color);
    }

    private final class ViewHolder {

        View view;
        ColorPanelView colorPanelView;
        ImageView imageView;
        int originalBorderColor;

        ViewHolder(Context context) {
            int layoutResId;
            if (colorShape == ColorShape.SQUARE) {
                layoutResId = R.layout.cpv_color_item_square;
            } else {
                layoutResId = R.layout.cpv_color_item_circle;
            }
            view = View.inflate(context, layoutResId, null);
            colorPanelView = view.findViewById(R.id.cpv_color_panel_view);
            imageView = view.findViewById(R.id.cpv_color_image_view);
            originalBorderColor = colorPanelView.getBorderColor();
            view.setTag(this);
        }

        void setup(int position) {
            int color = colors[position];
            int alpha = Color.alpha(color);
            colorPanelView.setColor(color);
            imageView.setImageResource(selectedPosition == position ? R.drawable.cpv_preset_checked : 0);
            if (alpha != 255) {
                if (alpha <= ColorPickerDialog.ALPHA_THRESHOLD) {
                    colorPanelView.setBorderColor(color | 0xFF000000);
                    imageView.setColorFilter(/*color | 0xFF000000*/Color.BLACK, PorterDuff.Mode.SRC_IN);
                } else {
                    colorPanelView.setBorderColor(originalBorderColor);
                    imageView.setColorFilter(Color.WHITE, PorterDuff.Mode.SRC_IN);
                }
            } else {
                setColorFilter(position);
            }
            setOnClickListener(position);
        }

        private void setOnClickListener(final int position) {
            colorPanelView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    if (selectedPosition != position) {
                        selectedPosition = position;
                        notifyDataSetChanged();
                    }
                    listener.onColorSelected(colors[position]);
                }
            });
            colorPanelView.setOnLongClickListener(new View.OnLongClickListener() {
                @Override
                public boolean onLongClick(View v) {
                    colorPanelView.showHint();
                    return true;
                }
            });
        }

        private void setColorFilter(int position) {
            if (position == selectedPosition && ColorUtils.calculateLuminance(colors[position]) >= 0.65) {
                imageView.setColorFilter(Color.BLACK, PorterDuff.Mode.SRC_IN);
            } else {
                imageView.setColorFilter(null);
            }
        }
    }
}