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// Copyright (c) IPython Development Team.
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// Distributed under the terms of the Modified BSD License.
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define([
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'base/js/namespace',
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'jquery',
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'base/js/events'
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], function(IPython, $, events) {
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"use strict";
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var CellToolbar = function (options) {
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// Constructor
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//
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// Parameters:
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// options: dictionary
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// Dictionary of keyword arguments.
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// events: $(Events) instance
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// cell: Cell instance
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// notebook: Notebook instance
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//
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// TODO: This leaks, when cell are deleted
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// There is still a reference to each celltoolbars.
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CellToolbar._instances.push(this);
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this.notebook = options.notebook;
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this.cell = options.cell;
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this.create_element();
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this.rebuild();
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return this;
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};
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CellToolbar.prototype.create_element = function () {
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this.inner_element = $('<div/>').addClass('celltoolbar');
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this.element = $('<div/>').addClass('ctb_hideshow')
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.append(this.inner_element);
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};
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// The default css style for the outer celltoolbar div
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// (ctb_hideshow) is display: none.
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// To show the cell toolbar, *both* of the following conditions must be met:
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// - A parent container has class `ctb_global_show`
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// - The celltoolbar has the class `ctb_show`
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// This allows global show/hide, as well as per-cell show/hide.
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CellToolbar.global_hide = function () {
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$('body').removeClass('ctb_global_show');
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};
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CellToolbar.global_show = function () {
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$('body').addClass('ctb_global_show');
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};
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CellToolbar.prototype.hide = function () {
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this.element.removeClass('ctb_show');
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};
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CellToolbar.prototype.show = function () {
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this.element.addClass('ctb_show');
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};
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/**
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* Class variable that should contain a dict of all available callback
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* we need to think of wether or not we allow nested namespace
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* @property _callback_dict
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* @private
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* @static
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* @type Dict
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*/
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CellToolbar._callback_dict = {};
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/**
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* Class variable that should contain the reverse order list of the button
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* to add to the toolbar of each cell
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* @property _ui_controls_list
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* @private
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* @static
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* @type List
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*/
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CellToolbar._ui_controls_list = [];
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/**
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* Class variable that should contain the CellToolbar instances for each
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* cell of the notebook
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*
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* @private
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* @property _instances
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* @static
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* @type List
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*/
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CellToolbar._instances = [];
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/**
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* keep a list of all the available presets for the toolbar
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* @private
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* @property _presets
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* @static
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* @type Dict
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*/
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CellToolbar._presets = {};
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// this is by design not a prototype.
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/**
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* Register a callback to create an UI element in a cell toolbar.
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* @method register_callback
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* @param name {String} name to use to refer to the callback. It is advised to use a prefix with the name
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* for easier sorting and avoid collision
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* @param callback {function(div, cell)} callback that will be called to generate the ui element
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* @param [cell_types] {List of String|undefined} optional list of cell types. If present the UI element
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* will be added only to cells of types in the list.
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*
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*
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* The callback will receive the following element :
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*
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* * a div in which to add element.
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* * the cell it is responsible from
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*
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* @example
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*
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* Example that create callback for a button that toggle between `true` and `false` label,
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* with the metadata under the key 'foo' to reflect the status of the button.
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*
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* // first param reference to a DOM div
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* // second param reference to the cell.
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* var toggle = function(div, cell) {
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* var button_container = $(div)
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*
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* // let's create a button that show the current value of the metadata
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* var button = $('<div/>').button({label:String(cell.metadata.foo)});
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*
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* // On click, change the metadata value and update the button label
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* button.click(function(){
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* var v = cell.metadata.foo;
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* cell.metadata.foo = !v;
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* button.button("option", "label", String(!v));
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* })
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*
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* // add the button to the DOM div.
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* button_container.append(button);
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* }
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*
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* // now we register the callback under the name `foo` to give the
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* // user the ability to use it later
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* CellToolbar.register_callback('foo', toggle);
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*/
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CellToolbar.register_callback = function(name, callback, cell_types) {
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// Overwrite if it already exists.
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CellToolbar._callback_dict[name] = cell_types ? {callback: callback, cell_types: cell_types} : callback;
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};
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/**
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* Register a preset of UI element in a cell toolbar.
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* Not supported Yet.
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* @method register_preset
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* @param name {String} name to use to refer to the preset. It is advised to use a prefix with the name
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* for easier sorting and avoid collision
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* @param preset_list {List of String} reverse order of the button in the toolbar. Each String of the list
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* should correspond to a name of a registerd callback.
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*
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* @private
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* @example
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*
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* CellToolbar.register_callback('foo.c1', function(div, cell){...});
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* CellToolbar.register_callback('foo.c2', function(div, cell){...});
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* CellToolbar.register_callback('foo.c3', function(div, cell){...});
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* CellToolbar.register_callback('foo.c4', function(div, cell){...});
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* CellToolbar.register_callback('foo.c5', function(div, cell){...});
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*
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* CellToolbar.register_preset('foo.foo_preset1', ['foo.c1', 'foo.c2', 'foo.c5'])
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* CellToolbar.register_preset('foo.foo_preset2', ['foo.c4', 'foo.c5'])
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*/
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CellToolbar.register_preset = function(name, preset_list, notebook) {
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CellToolbar._presets[name] = preset_list;
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events.trigger('preset_added.CellToolbar', {name: name});
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// When "register_callback" is called by a custom extension, it may be executed after notebook is loaded.
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// In that case, activate the preset if needed.
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if (notebook && notebook.metadata && notebook.metadata.celltoolbar === name){
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CellToolbar.activate_preset(name);
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}
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};
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/**
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* List the names of the presets that are currently registered.
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*
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* @method list_presets
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* @static
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*/
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CellToolbar.list_presets = function() {
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var keys = [];
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for (var k in CellToolbar._presets) {
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keys.push(k);
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}
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return keys;
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};
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/**
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* Activate an UI preset from `register_preset`
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*
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* This does not update the selection UI.
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*
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* @method activate_preset
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* @param preset_name {String} string corresponding to the preset name
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*
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* @static
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* @private
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* @example
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*
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* CellToolbar.activate_preset('foo.foo_preset1');
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*/
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CellToolbar.activate_preset = function(preset_name){
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var preset = CellToolbar._presets[preset_name];
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if(preset !== undefined){
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CellToolbar._ui_controls_list = preset;
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CellToolbar.rebuild_all();
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}
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events.trigger('preset_activated.CellToolbar', {name: preset_name});
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};
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/**
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* This should be called on the class and not on a instance as it will trigger
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* rebuild of all the instances.
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* @method rebuild_all
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* @static
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*
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*/
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CellToolbar.rebuild_all = function(){
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for(var i=0; i < CellToolbar._instances.length; i++){
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CellToolbar._instances[i].rebuild();
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}
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};
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/**
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* Rebuild all the button on the toolbar to update its state.
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* @method rebuild
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*/
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CellToolbar.prototype.rebuild = function(){
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// strip evrything from the div
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// which is probably inner_element
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// or this.element.
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this.inner_element.empty();
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this.ui_controls_list = [];
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var callbacks = CellToolbar._callback_dict;
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var preset = CellToolbar._ui_controls_list;
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// Yes we iterate on the class variable, not the instance one.
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for (var i=0; i < preset.length; i++) {
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var key = preset[i];
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var callback = callbacks[key];
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if (!callback) continue;
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if (typeof callback === 'object') {
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if (callback.cell_types.indexOf(this.cell.cell_type) === -1) continue;
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callback = callback.callback;
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}
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var local_div = $('<div/>').addClass('button_container');
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try {
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callback(local_div, this.cell, this);
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this.ui_controls_list.push(key);
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} catch (e) {
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console.log("Error in cell toolbar callback " + key, e);
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continue;
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}
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// only append if callback succeeded.
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this.inner_element.append(local_div);
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}
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// If there are no controls or the cell is a rendered TextCell hide the toolbar.
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if (!this.ui_controls_list.length || (this.cell.cell_type != 'code' && this.cell.rendered)) {
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this.hide();
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} else {
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this.show();
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}
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};
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/**
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*/
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CellToolbar.utils = {};
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/**
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* A utility function to generate bindings between a checkbox and cell/metadata
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* @method utils.checkbox_ui_generator
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* @static
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*
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* @param name {string} Label in front of the checkbox
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* @param setter {function( cell, newValue )}
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* A setter method to set the newValue
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* @param getter {function( cell )}
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* A getter methods which return the current value.
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*
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* @return callback {function( div, cell )} Callback to be passed to `register_callback`
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*
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* @example
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*
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* An exmple that bind the subkey `slideshow.isSectionStart` to a checkbox with a `New Slide` label
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*
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* var newSlide = CellToolbar.utils.checkbox_ui_generator('New Slide',
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* // setter
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* function(cell, value){
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* // we check that the slideshow namespace exist and create it if needed
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* if (cell.metadata.slideshow == undefined){cell.metadata.slideshow = {}}
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* // set the value
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* cell.metadata.slideshow.isSectionStart = value
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* },
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* //geter
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* function(cell){ var ns = cell.metadata.slideshow;
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* // if the slideshow namespace does not exist return `undefined`
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* // (will be interpreted as `false` by checkbox) otherwise
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* // return the value
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* return (ns == undefined)? undefined: ns.isSectionStart
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* }
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* );
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*
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* CellToolbar.register_callback('newSlide', newSlide);
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*
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*/
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CellToolbar.utils.checkbox_ui_generator = function(name, setter, getter){
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return function(div, cell, celltoolbar) {
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var button_container = $(div);
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var chkb = $('<input/>').attr('type', 'checkbox');
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var lbl = $('<label/>').append($('<span/>').text(name));
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lbl.append(chkb);
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chkb.attr("checked", getter(cell));
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chkb.click(function(){
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var v = getter(cell);
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setter(cell, !v);
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chkb.attr("checked", !v);
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});
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button_container.append($('<span/>').append(lbl));
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};
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};
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/**
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* A utility function to generate bindings between a dropdown list cell
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* @method utils.select_ui_generator
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* @static
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*
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* @param list_list {list of sublist} List of sublist of metadata value and name in the dropdown list.
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* subslit shoud contain 2 element each, first a string that woul be displayed in the dropdown list,
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* and second the corresponding value to be passed to setter/return by getter. the corresponding value
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* should not be "undefined" or behavior can be unexpected.
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* @param setter {function( cell, newValue )}
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* A setter method to set the newValue
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* @param getter {function( cell )}
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* A getter methods which return the current value of the metadata.
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* @param [label=""] {String} optionnal label for the dropdown menu
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*
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* @return callback {function( div, cell )} Callback to be passed to `register_callback`
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*
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* @example
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*
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* var select_type = CellToolbar.utils.select_ui_generator([
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* ["<None>" , "None" ],
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* ["Header Slide" , "header_slide" ],
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* ["Slide" , "slide" ],
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* ["Fragment" , "fragment" ],
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* ["Skip" , "skip" ],
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* ],
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* // setter
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* function(cell, value){
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* // we check that the slideshow namespace exist and create it if needed
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* if (cell.metadata.slideshow == undefined){cell.metadata.slideshow = {}}
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* // set the value
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* cell.metadata.slideshow.slide_type = value
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* },
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* //geter
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* function(cell){ var ns = cell.metadata.slideshow;
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* // if the slideshow namespace does not exist return `undefined`
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* // (will be interpreted as `false` by checkbox) otherwise
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* // return the value
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* return (ns == undefined)? undefined: ns.slide_type
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* }
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* CellToolbar.register_callback('slideshow.select', select_type);
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*
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*/
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CellToolbar.utils.select_ui_generator = function(list_list, setter, getter, label) {
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label = label || "";
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return function(div, cell, celltoolbar) {
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var button_container = $(div);
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var lbl = $("<label/>").append($('<span/>').text(label));
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var select = $('<select/>').addClass('ui-widget ui-widget-content');
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for(var i=0; i < list_list.length; i++){
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var opt = $('<option/>')
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.attr('value', list_list[i][1])
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.text(list_list[i][0]);
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select.append(opt);
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}
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select.val(getter(cell));
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select.change(function(){
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setter(cell, select.val());
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});
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button_container.append($('<span/>').append(lbl).append(select));
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};
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};
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// Backwards compatability.
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IPython.CellToolbar = CellToolbar;
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return {'CellToolbar': CellToolbar};
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});
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