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/*
* 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.android.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.android.colorpicker.ColorPickerSwatch.OnColorSelectedListener;
/**
* A color picker custom view which creates an grid of color squares. The number of squares per
* row (and the padding between the squares) is determined by the user.
*/
public class ColorPickerPalette extends TableLayout {
public OnColorSelectedListener mOnColorSelectedListener;
private String mDescription;
private String mDescriptionSelected;
private int mSwatchLength;
private int mMarginSize;
private int mNumColumns;
public ColorPickerPalette(Context context, AttributeSet attrs) {
super(context, attrs);
}
public ColorPickerPalette(Context context) {
super(context);
}
/**
* Initialize the size, columns, and listener. Size should be a pre-defined size (SIZE_LARGE
* or SIZE_SMALL) from ColorPickerDialogFragment.
*/
public void init(int size, int columns, OnColorSelectedListener listener) {
mNumColumns = columns;
Resources res = getResources();
if (size == ColorPickerDialog.SIZE_LARGE) {
mSwatchLength = res.getDimensionPixelSize(R.dimen.color_swatch_large);
mMarginSize = res.getDimensionPixelSize(R.dimen.color_swatch_margins_large);
} else {
mSwatchLength = res.getDimensionPixelSize(R.dimen.color_swatch_small);
mMarginSize = res.getDimensionPixelSize(R.dimen.color_swatch_margins_small);
}
mOnColorSelectedListener = listener;
mDescription = res.getString(R.string.color_swatch_description);
mDescriptionSelected = res.getString(R.string.color_swatch_description_selected);
}
private TableRow createTableRow() {
TableRow row = new TableRow(getContext());
ViewGroup.LayoutParams params = new ViewGroup.LayoutParams(LayoutParams.WRAP_CONTENT,
LayoutParams.WRAP_CONTENT);
row.setLayoutParams(params);
return row;
}
/**
* Adds swatches to table in a serpentine format.
*/
public void drawPalette(int[] colors, int selectedColor) {
if (colors == null) {
return;
}
this.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);
}
}
/**
* Appends a swatch to the end of the row for even-numbered rows (starting with row 0),
* to the beginning of a row for odd-numbered rows.
*/
private static void addSwatchToRow(TableRow row, View swatch, int rowNumber) {
if (rowNumber % 2 == 0) {
row.addView(swatch);
} else {
row.addView(swatch, 0);
}
}
/**
* Add a content description to the specified swatch view. Because the colors get added in a
* snaking form, every other row will need to compensate for the fact that the colors are added
* in an opposite direction from their left->right/top->bottom order, which is how the system
* will arrange them for accessibility purposes.
*/
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);
}
/**
* Creates a blank space to fill the row.
*/
private ImageView createBlankSpace() {
ImageView view = new ImageView(getContext());
TableRow.LayoutParams params = new TableRow.LayoutParams(mSwatchLength, mSwatchLength);
params.setMargins(mMarginSize, mMarginSize, mMarginSize, mMarginSize);
view.setLayoutParams(params);
return view;
}
/**
* Creates a color swatch.
*/
private ColorPickerSwatch createColorSwatch(int color, int selectedColor) {
ColorPickerSwatch view = new ColorPickerSwatch(getContext(), color,
color == selectedColor, mOnColorSelectedListener);
TableRow.LayoutParams params = new TableRow.LayoutParams(mSwatchLength, mSwatchLength);
params.setMargins(mMarginSize, mMarginSize, mMarginSize, mMarginSize);
view.setLayoutParams(params);
return view;
}
}
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