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// Copyright 2007 The Closure Library Authors. All Rights Reserved.
//
// 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.
/**
* @fileoverview A control for representing a palette of colors, that the user
* can highlight or select via the keyboard or the mouse.
*
*/
goog.provide('goog.ui.ColorPalette');
goog.require('goog.array');
goog.require('goog.color');
goog.require('goog.dom');
goog.require('goog.style');
goog.require('goog.ui.Palette');
goog.require('goog.ui.PaletteRenderer');
/**
* A color palette is a grid of color swatches that the user can highlight or
* select via the keyboard or the mouse. The selection state of the palette is
* controlled by a selection model. When the user makes a selection, the
* component fires an ACTION event. Event listeners may retrieve the selected
* color using the {@link #getSelectedColor} method.
*
* @param {Array.<string>=} opt_colors Array of colors in any valid CSS color
* format.
* @param {goog.ui.PaletteRenderer=} opt_renderer Renderer used to render or
* decorate the palette; defaults to {@link goog.ui.PaletteRenderer}.
* @param {goog.dom.DomHelper=} opt_domHelper Optional DOM helper, used for
* document interaction.
* @constructor
* @extends {goog.ui.Palette}
*/
goog.ui.ColorPalette = function(opt_colors, opt_renderer, opt_domHelper) {
/**
* Array of colors to show in the palette.
* @type {Array.<string>}
* @private
*/
this.colors_ = opt_colors || [];
goog.ui.Palette.call(this, null,
opt_renderer || goog.ui.PaletteRenderer.getInstance(), opt_domHelper);
// Set the colors separately from the super call since we need the correct
// DomHelper to be initialized for this class.
this.setColors(this.colors_);
};
goog.inherits(goog.ui.ColorPalette, goog.ui.Palette);
/**
* Array of normalized colors. Inited lazily as often never needed.
* @type {Array.<string>?}
* @private
*/
goog.ui.ColorPalette.prototype.normalizedColors_ = null;
/**
* Returns the array of colors represented in the color palette.
* @return {Array.<string>} Array of colors.
*/
goog.ui.ColorPalette.prototype.getColors = function() {
return this.colors_;
};
/**
* Sets the colors that are contained in the palette.
* @param {Array.<string>} colors Array of colors in any valid CSS color format.
*/
goog.ui.ColorPalette.prototype.setColors = function(colors) {
this.colors_ = colors;
this.normalizedColors_ = null;
this.setContent(this.createColorNodes());
};
/**
* @return {?string} The current selected color in hex, or null.
*/
goog.ui.ColorPalette.prototype.getSelectedColor = function() {
var selectedItem = /** @type {Element} */ (this.getSelectedItem());
if (selectedItem) {
var color = goog.style.getStyle(selectedItem, 'background-color');
return goog.ui.ColorPalette.parseColor_(color);
} else {
return null;
}
};
/**
* Sets the selected color. Clears the selection if the argument is null or
* can't be parsed as a color.
* @param {?string} color The color to set as selected; null clears the
* selection.
*/
goog.ui.ColorPalette.prototype.setSelectedColor = function(color) {
var hexColor = goog.ui.ColorPalette.parseColor_(color);
if (!this.normalizedColors_) {
this.normalizedColors_ = goog.array.map(this.colors_, function(color) {
return goog.ui.ColorPalette.parseColor_(color);
});
}
this.setSelectedIndex(hexColor ?
goog.array.indexOf(this.normalizedColors_, hexColor) : -1);
};
/**
* @return {Array.<Node>} An array of DOM nodes for each color.
* @protected
*/
goog.ui.ColorPalette.prototype.createColorNodes = function() {
return goog.array.map(this.colors_, function(color) {
var swatch = this.getDomHelper().createDom('div', {
'class': goog.getCssName(this.getRenderer().getCssClass(),
'colorswatch'),
'style': 'background-color:' + color
});
swatch.title = color.charAt(0) == '#' ?
'RGB (' + goog.color.hexToRgb(color).join(', ') + ')' : color;
return swatch;
}, this);
};
/**
* Takes a string, attempts to parse it as a color spec, and returns a
* normalized hex color spec if successful (null otherwise).
* @param {?string} color String possibly containing a color spec; may be null.
* @return {?string} Normalized hex color spec, or null if the argument can't
* be parsed as a color.
* @private
*/
goog.ui.ColorPalette.parseColor_ = function(color) {
if (color) {
/** @preserveTry */
try {
return goog.color.parse(color).hex;
} catch (ex) {
// Fall through.
}
}
return null;
};
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