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// Copyright 2009 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.
goog.provide('goog.ui.equation.PaletteManager');
goog.require('goog.Timer');
goog.require('goog.events.EventTarget');
goog.require('goog.ui.equation.ArrowPalette');
goog.require('goog.ui.equation.ComparisonPalette');
goog.require('goog.ui.equation.GreekPalette');
goog.require('goog.ui.equation.MathPalette');
goog.require('goog.ui.equation.MenuPalette');
goog.require('goog.ui.equation.Palette');
goog.require('goog.ui.equation.SymbolPalette');
/**
* Constructs the palette manager that manages all the palettes in Equation
* Editor.
* @constructor
* @extends {goog.events.EventTarget}
*/
goog.ui.equation.PaletteManager = function() {
goog.events.EventTarget.call(this);
/**
* The map of palette type and instance pair.
* @type {Object.<string, goog.ui.equation.Palette>}
* @private
*/
this.paletteMap_ = {};
/**
* The current active palette.
* @type {goog.ui.equation.Palette}
* @private
*/
this.activePalette_ = null;
/**
* The event handler for managing events.
* @type {goog.events.EventHandler}
* @private
*/
this.eventHandler_ = new goog.events.EventHandler(this);
/**
* The timer used to add grace period when deactivate palettes.
* @type {goog.Timer}
* @private
*/
this.deactivationTimer_ = new goog.Timer(300);
this.eventHandler_.listen(this.deactivationTimer_, goog.Timer.TICK,
this.handleDeactivation_);
};
goog.inherits(goog.ui.equation.PaletteManager,
goog.events.EventTarget);
/**
* Clears the deactivation timer. This is used to prevent palette manager
* deactivation when mouse pointer is moved outside palettes and moved back
* quickly inside a grace period.
*/
goog.ui.equation.PaletteManager.prototype.stopDeactivation = function() {
this.deactivationTimer_.stop();
};
/**
* Returns the palette instance of given type.
* @param {goog.ui.equation.Palette.Type} type The type of palette
* to get.
* @return {goog.ui.equation.Palette} The palette instance of given
* type. A new instance will be created. If the instance doesn't exist.
*/
goog.ui.equation.PaletteManager.prototype.getPalette =
function(type) {
var paletteMap = this.paletteMap_;
var palette = paletteMap[type];
if (!palette) {
switch (type) {
case goog.ui.equation.Palette.Type.MENU:
palette = new goog.ui.equation.MenuPalette(this);
break;
case goog.ui.equation.Palette.Type.GREEK:
palette = new goog.ui.equation.GreekPalette(this);
break;
case goog.ui.equation.Palette.Type.SYMBOL:
palette = new goog.ui.equation.SymbolPalette(this);
break;
case goog.ui.equation.Palette.Type.COMPARISON:
palette = new goog.ui.equation.ComparisonPalette(this);
break;
case goog.ui.equation.Palette.Type.MATH:
palette = new goog.ui.equation.MathPalette(this);
break;
case goog.ui.equation.Palette.Type.ARROW:
palette = new goog.ui.equation.ArrowPalette(this);
break;
default:
throw new Error('Invalid palette type!');
}
paletteMap[type] = palette;
}
return palette;
};
/**
* Sets the palette instance of given type to be the active one.
* @param {goog.ui.equation.Palette.Type} type The type of the
* palette to set active.
* @return {goog.ui.equation.Palette} The palette instance of given
* type. A new instance will be created, if the instance doesn't exist.
*/
goog.ui.equation.PaletteManager.prototype.setActive =
function(type) {
var palette = this.activePalette_;
if (palette) {
palette.setVisible(false);
}
palette = this.getPalette(type);
this.activePalette_ = palette;
palette.setVisible(true);
return palette;
};
/**
* Returns the active palette.
* @return {goog.ui.equation.Palette} The active palette.
*/
goog.ui.equation.PaletteManager.prototype.getActive = function() {
return this.activePalette_;
};
/**
* Starts the deactivation of open palette.
* This method has a slight delay before doing the real deactivation. This
* helps prevent sudden disappearing of palettes when user moves mouse outside
* them just briefly (and maybe accidentally). If you really want to deactivate
* the active palette, use {@link #deactivateNow()} instead.
*/
goog.ui.equation.PaletteManager.prototype.deactivate = function() {
this.deactivationTimer_.start();
};
/**
* Deactivate the open palette immediately.
*/
goog.ui.equation.PaletteManager.prototype.deactivateNow = function() {
this.handleDeactivation_();
};
/**
* Internal process of deactivation of the manager.
* @private
*/
goog.ui.equation.PaletteManager.prototype.handleDeactivation_ = function() {
this.setActive(goog.ui.equation.Palette.Type.MENU);
};
/** @override */
goog.ui.equation.PaletteManager.prototype.disposeInternal = function() {
goog.base(this, 'disposeInternal');
this.activePalette_ = null;
this.paletteMap_ = null;
};
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