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// Copyright 2008 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.EquationEditor');
goog.require('goog.dom');
goog.require('goog.events');
goog.require('goog.ui.Component');
goog.require('goog.ui.Tab');
goog.require('goog.ui.TabBar');
goog.require('goog.ui.equation.EditorPane');
goog.require('goog.ui.equation.ImageRenderer');
goog.require('goog.ui.equation.TexPane');
/**
* User interface for equation editor plugin.
* @constructor
* @param {Object} context The context that this equation editor runs in.
* @param {goog.dom.DomHelper=} opt_domHelper DomHelper to use.
* @param {string=} opt_helpUrl Help document URL to use in the "Learn more"
* link.
* @extends {goog.ui.Component}
*/
goog.ui.equation.EquationEditor = function(context, opt_domHelper,
opt_helpUrl) {
goog.base(this, opt_domHelper);
/**
* The context this editor runs in.
* @type {Object}
* @private
*/
this.context_ = context;
/**
* Help document URL to use in the "Learn more" link.
* @type {string}
* @private
*/
this.helpUrl_ = opt_helpUrl || '';
};
goog.inherits(goog.ui.equation.EquationEditor, goog.ui.Component);
/**
* Constants for event names.
* @enum {string}
*/
goog.ui.equation.EquationEditor.EventType = {
/**
* Dispatched when equation changes.
*/
CHANGE: 'change'
};
/**
* The index of the last active tab. Zero means first tab.
* @type {number}
* @private
*/
goog.ui.equation.EquationEditor.prototype.activeTabIndex_ = 0;
/** @override */
goog.ui.equation.EquationEditor.prototype.createDom = function() {
goog.base(this, 'createDom');
this.createDom_();
};
/**
* Creates main editor contents.
* @private
*/
goog.ui.equation.EquationEditor.prototype.createDom_ = function() {
var contentElement = this.getElement();
/** @desc Title of the visual equation editor tab. */
var MSG_VISUAL_EDITOR = goog.getMsg('Editor');
/** @desc Title of the TeX equation editor tab. */
var MSG_TEX_EDITOR = goog.getMsg('TeX');
// Create the main tabs
var dom = this.dom_;
var tabTop = dom.createDom('div',
{'class': 'goog-tab-bar goog-tab-bar-top'},
dom.createDom('div',
{'class': 'goog-tab goog-tab-selected'}, MSG_VISUAL_EDITOR),
dom.createDom('div', {'class': 'goog-tab'}, MSG_TEX_EDITOR));
var tabClear = dom.createDom('div', {'class': 'goog-tab-bar-clear'});
var tabContent = dom.createDom('div', {'class': 'ee-content'});
dom.appendChild(contentElement, tabTop);
dom.appendChild(contentElement, tabClear);
dom.appendChild(contentElement, tabContent);
var tabBar = new goog.ui.TabBar();
tabBar.decorate(tabTop);
/**
* The tab bar.
* @type {!goog.ui.TabBar}
* @private
*/
this.tabBar_ = tabBar;
goog.events.listen(tabBar, goog.ui.Component.EventType.SELECT,
goog.bind(this.handleTabSelect_, this));
var texEditor = new goog.ui.equation.TexPane(this.context_,
this.helpUrl_, this.dom_);
this.addChild(texEditor);
texEditor.render(tabContent);
this.setVisibleTab_(0); // Make first tab visible
};
/**
* Sets the visibility of the editor.
* @param {boolean} visible Whether the editor should be visible.
*/
goog.ui.equation.EquationEditor.prototype.setVisible = function(visible) {
// Show active tab if visible, or none if not
this.setVisibleTab_(visible ? this.activeTabIndex_ : -1);
};
/**
* Sets the tab at the selected index as visible and all the rest as not
* visible.
* @param {number} tabIndex The tab index that is visible. -1 means no
* tab is visible.
* @private
*/
goog.ui.equation.EquationEditor.prototype.setVisibleTab_ = function(tabIndex) {
for (var i = 0; i < this.getChildCount(); i++) {
this.getChildAt(i).setVisible(i == tabIndex);
}
};
/** @override */
goog.ui.equation.EquationEditor.prototype.decorateInternal = function(element) {
this.setElementInternal(element);
this.createDom_();
};
/**
* Returns the encoded equation.
* @return {string} The encoded equation.
*/
goog.ui.equation.EquationEditor.prototype.getEquation = function() {
var sel = this.tabBar_.getSelectedTabIndex();
return this.getChildAt(sel).getEquation();
};
/**
* @return {string} The html code to embed in the document.
*/
goog.ui.equation.EquationEditor.prototype.getHtml = function() {
return goog.ui.equation.ImageRenderer.getHtml(this.getEquation());
};
/**
* Checks whether the current equation is valid and can be used in a document.
* @return {boolean} Whether the equation is valid.
*/
goog.ui.equation.EquationEditor.prototype.isValid = function() {
return goog.ui.equation.ImageRenderer.isEquationTooLong(
this.getEquation());
};
/**
* Handles a tab selection by the user.
* @param {goog.events.Event} e The event.
* @private
*/
goog.ui.equation.EquationEditor.prototype.handleTabSelect_ = function(e) {
var sel = this.tabBar_.getSelectedTabIndex();
if (sel != this.activeTabIndex_) {
this.activeTabIndex_ = sel;
this.setVisibleTab_(sel);
}
// TODO(user) Pass equation from the tab to the other is modified
};
/**
* Parse an equation and draw it.
* Clears any previous displayed equation.
* @param {string} equation The equation text to parse.
*/
goog.ui.equation.EquationEditor.prototype.setEquation = function(equation) {
var sel = this.tabBar_.getSelectedTabIndex();
this.getChildAt(sel).setEquation(equation);
};
/** @override */
goog.ui.equation.EquationEditor.prototype.disposeInternal = function() {
this.context_ = null;
goog.base(this, 'disposeInternal');
};
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