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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.editor.plugins.EquationEditorPlugin');
goog.require('goog.editor.Command');
goog.require('goog.editor.plugins.AbstractDialogPlugin');
goog.require('goog.editor.range');
goog.require('goog.functions');
goog.require('goog.ui.editor.AbstractDialog.Builder');
goog.require('goog.ui.editor.EquationEditorDialog');
goog.require('goog.ui.editor.EquationEditorOkEvent');
goog.require('goog.ui.equation.EquationEditor');
goog.require('goog.ui.equation.ImageRenderer');
goog.require('goog.ui.equation.TexEditor');
/**
* A plugin that opens the equation editor in a dialog window.
* @param {string=} opt_helpUrl A URL pointing to help documentation.
* @constructor
* @extends {goog.editor.plugins.AbstractDialogPlugin}
*/
goog.editor.plugins.EquationEditorPlugin = function(opt_helpUrl) {
/**
* The IMG element for the equation being edited, null if creating a new
* equation.
* @type {Element}
* @private
*/
this.originalElement_;
/**
* A URL pointing to help documentation.
* @type {string}
* @private
*/
this.helpUrl_ = opt_helpUrl || '';
/**
* The listener key for double click events.
* @type {number?}
* @private
*/
this.dblClickKey_;
goog.editor.plugins.AbstractDialogPlugin.call(this,
goog.editor.Command.EQUATION);
};
goog.inherits(goog.editor.plugins.EquationEditorPlugin,
goog.editor.plugins.AbstractDialogPlugin);
/**
* The logger for the EquationEditorPlugin.
* @type {goog.debug.Logger}
* @private
*/
goog.editor.plugins.EquationEditorPlugin.prototype.logger_ =
goog.debug.Logger.getLogger('goog.editor.plugins.EquationEditorPlugin');
/** @override */
goog.editor.plugins.EquationEditorPlugin.prototype.getTrogClassId =
goog.functions.constant('EquationEditorPlugin');
/**
* @override
*/
goog.editor.plugins.EquationEditorPlugin.prototype.createDialog =
function(dom, opt_arg) {
var equationImgEl = /** @type {Element} */ (opt_arg || null);
var equationStr = equationImgEl ?
goog.ui.equation.ImageRenderer.getEquationFromImage(equationImgEl) : '';
this.originalElement_ = equationImgEl;
var dialog = new goog.ui.editor.EquationEditorDialog(
this.populateContext_(), dom, equationStr, this.helpUrl_);
dialog.addEventListener(goog.ui.editor.AbstractDialog.EventType.OK,
this.handleOk_,
false,
this);
return dialog;
};
/**
* Populates the context that this plugin runs in.
* @return {Object} The context that this plugin runs in.
* @private
*/
goog.editor.plugins.EquationEditorPlugin.prototype.populateContext_ =
function() {
var context = {};
context.paletteManager = new goog.ui.equation.PaletteManager();
return context;
};
/**
* Returns the selected text in the editable field for using as initial
* equation string for the equation editor.
*
* TODO(user): Sanity check the selected text and return it only if it
* reassembles a TeX equation and is not too long.
*
* @return {string} Selected text in the editable field for using it as
* initial equation string for the equation editor.
* @private
*/
goog.editor.plugins.EquationEditorPlugin.prototype.getEquationFromSelection_ =
function() {
var range = this.getFieldObject().getRange();
if (range) {
return range.getText();
}
return '';
};
/** @override */
goog.editor.plugins.EquationEditorPlugin.prototype.enable =
function(fieldObject) {
goog.base(this, 'enable', fieldObject);
if (this.isEnabled(fieldObject)) {
this.dblClickKey_ = goog.events.listen(fieldObject.getElement(),
goog.events.EventType.DBLCLICK,
goog.bind(this.handleDoubleClick_, this), false, this);
}
};
/** @override */
goog.editor.plugins.EquationEditorPlugin.prototype.disable =
function(fieldObject) {
goog.base(this, 'disable', fieldObject);
if (!this.isEnabled(fieldObject)) {
goog.events.unlistenByKey(this.dblClickKey_);
}
};
/**
* Handles double clicks in the field area.
* @param {goog.events.Event} e The event.
* @private
*/
goog.editor.plugins.EquationEditorPlugin.prototype.handleDoubleClick_ =
function(e) {
var node = /** @type {Node} */ (e.target);
this.execCommand(goog.editor.Command.EQUATION, node);
};
/**
* Called when user clicks OK. Inserts the equation at cursor position in the
* active editable field.
* @param {goog.ui.editor.EquationEditorOkEvent} e The OK event.
* @private
*/
goog.editor.plugins.EquationEditorPlugin.prototype.handleOk_ =
function(e) {
// First restore the selection so we can manipulate the editable field's
// content according to what was selected.
this.restoreOriginalSelection();
// Notify listeners that the editable field's contents are about to change.
this.getFieldObject().dispatchBeforeChange();
var dh = this.getFieldDomHelper();
var node = dh.htmlToDocumentFragment(e.equationHtml);
if (this.originalElement_) {
// Editing existing equation: replace the old equation node with the new
// one.
goog.dom.replaceNode(node, this.originalElement_);
} else {
// Clear out what was previously selected, unless selection is already
// empty (aka collapsed), and replace it with the new equation node.
// TODO(user): there is a bug in FF where removeContents() may remove a
// <br> right before and/or after the selection. Currently this is fixed
// only for case of collapsed selection where we simply avoid calling
// removeContants().
var range = this.getFieldObject().getRange();
if (!range.isCollapsed()) {
range.removeContents();
}
node = range.insertNode(node, false);
}
// Place the cursor to the right of the
// equation image.
goog.editor.range.placeCursorNextTo(node, false);
this.getFieldObject().dispatchChange();
};
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