ColorPickerPalette.java

package com.moez.QKSMS.ui.view.colorpicker;

import android.content.Context;
import android.content.res.Resources;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TableLayout;
import android.widget.TableRow;
import com.moez.QKSMS.R;

public class ColorPickerPalette extends TableLayout {
    private String mDescription;
    private String mDescriptionSelected;
    private int mMarginSize;
    private int mNumColumns;
    public ColorPickerSwatch.OnColorSelectedListener mOnColorSelectedListener;
    private int mSwatchLength;

    public ColorPickerPalette(Context context) {
        super(context);
    }

    public ColorPickerPalette(Context context, AttributeSet attributeSet) {
        super(context, attributeSet);
    }

    private void addSwatchToRow(TableRow tableRow, View view, int line) {
        if (line % 2 == 0) {
            tableRow.addView(view);
            return;
        }
        tableRow.addView(view, 0);
    }

    private ImageView createBlankSpace() {
        ImageView imageView = new ImageView(getContext());
        TableRow.LayoutParams layoutParams = new TableRow.LayoutParams(mSwatchLength, mSwatchLength);
        layoutParams.setMargins(mMarginSize, mMarginSize, mMarginSize, mMarginSize);
        imageView.setLayoutParams(layoutParams);
        return imageView;
    }

    private ColorPickerSwatch createColorSwatch(int color, int selectedColor) {
        ColorPickerSwatch colorPickerSwatch = new ColorPickerSwatch(getContext(), color, color == selectedColor, mOnColorSelectedListener);
        TableRow.LayoutParams layoutParams = new TableRow.LayoutParams(mSwatchLength, mSwatchLength);
        layoutParams.setMargins(mMarginSize, mMarginSize, mMarginSize, mMarginSize);
        colorPickerSwatch.setLayoutParams(layoutParams);
        return colorPickerSwatch;
    }

    private TableRow createTableRow() {
        TableRow localTableRow = new TableRow(getContext());
        localTableRow.setLayoutParams(new ViewGroup.LayoutParams(-2, -2));
        return localTableRow;
    }

    private void setSwatchDescription(int rowNumber, int index, int rowElements, boolean selected, View swatch) {
        int accessibilityIndex;
        if (rowNumber % 2 == 0) {
            // We're in a regular-ordered row
            accessibilityIndex = index;
        } else {
            // We're in a backwards-ordered row.
            int rowMax = ((rowNumber + 1) * mNumColumns);
            accessibilityIndex = rowMax - rowElements;
        }

        String description;
        if (selected) {
            description = String.format(mDescriptionSelected, accessibilityIndex);
        } else {
            description = String.format(mDescription, accessibilityIndex);
        }
        swatch.setContentDescription(description);
    }

    public void drawPalette(int[] colors, int selectedColor) {
        if (colors == null) {
            return;
        }

        removeAllViews();
        int tableElements = 0;
        int rowElements = 0;
        int rowNumber = 0;

        // Fills the table with swatches based on the array of colors.
        TableRow row = createTableRow();
        for (int color : colors) {
            tableElements++;

            View colorSwatch = createColorSwatch(color, selectedColor);
            setSwatchDescription(rowNumber, tableElements, rowElements, color == selectedColor, colorSwatch);
            addSwatchToRow(row, colorSwatch, rowNumber);

            rowElements++;
            if (rowElements == mNumColumns) {
                addView(row);
                row = createTableRow();
                rowElements = 0;
                rowNumber++;
            }
        }

        // Create blank views to fill the row if the last row has not been filled.
        if (rowElements > 0) {
            while (rowElements != mNumColumns) {
                addSwatchToRow(row, createBlankSpace(), rowNumber);
                rowElements++;
            }
            addView(row);
        }
    }

    public void init(int size, int numColumns, ColorPickerSwatch.OnColorSelectedListener onColorSelectedListener) {
        mNumColumns = numColumns;
        Resources resources = getResources();
        if (size == 1) {
            mSwatchLength = resources.getDimensionPixelSize(R.dimen.color_swatch_large);
            mMarginSize = resources.getDimensionPixelSize(R.dimen.color_swatch_margins_large);
        } else {
            mSwatchLength = resources.getDimensionPixelSize(R.dimen.color_swatch_small);
            mMarginSize = resources.getDimensionPixelSize(R.dimen.color_swatch_margins_small);
        }
        mOnColorSelectedListener = onColorSelectedListener;
        mDescription = resources.getString(R.string.color_swatch_description);
        mDescriptionSelected = resources.getString(R.string.color_swatch_description_selected);
    }
}