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| import {
isFunction,
isArray,
forEach
} from 'min-dash';
import {
domify,
query as domQuery,
attr as domAttr,
clear as domClear,
classes as domClasses,
matches as domMatches,
delegate as domDelegate,
event as domEvent
} from 'min-dom';
var TOGGLE_SELECTOR = '.djs-palette-toggle',
ENTRY_SELECTOR = '.entry',
ELEMENT_SELECTOR = TOGGLE_SELECTOR + ', ' + ENTRY_SELECTOR;
var PALETTE_OPEN_CLS = 'open',
PALETTE_TWO_COLUMN_CLS = 'two-column';
/**
* A palette containing modeling elements.
*/
export default function Palette(eventBus, canvas) {
this._eventBus = eventBus;
this._canvas = canvas;
this._providers = [];
var self = this;
eventBus.on('tool-manager.update', function(event) {
var tool = event.tool;
self.updateToolHighlight(tool);
});
eventBus.on('i18n.changed', function() {
self._update();
});
eventBus.on('diagram.init', function() {
self._diagramInitialized = true;
// initialize + update once diagram is ready
if (self._providers.length) {
self._init();
self._update();
}
});
}
Palette.$inject = [ 'eventBus', 'canvas' ];
/**
* Register a provider with the palette
*
* @param {PaletteProvider} provider
*/
Palette.prototype.registerProvider = function(provider) {
this._providers.push(provider);
// postpone init / update until diagram is initialized
if (!this._diagramInitialized) {
return;
}
Eif (!this._container) {
this._init();
}
this._update();
};
/**
* Returns the palette entries for a given element
*
* @return {Array<PaletteEntryDescriptor>} list of entries
*/
Palette.prototype.getEntries = function() {
var entries = {};
// loop through all providers and their entries.
// group entries by id so that overriding an entry is possible
forEach(this._providers, function(provider) {
var e = provider.getPaletteEntries();
forEach(e, function(entry, id) {
entries[id] = entry;
});
});
return entries;
};
/**
* Initialize
*/
Palette.prototype._init = function() {
var canvas = this._canvas,
eventBus = this._eventBus;
var parent = canvas.getContainer(),
container = this._container = domify(Palette.HTML_MARKUP),
self = this;
parent.appendChild(container);
domDelegate.bind(container, ELEMENT_SELECTOR, 'click', function(event) {
var target = event.delegateTarget;
if (domMatches(target, TOGGLE_SELECTOR)) {
return self.toggle();
}
self.trigger('click', event);
});
// prevent drag propagation
domEvent.bind(container, 'mousedown', function(event) {
event.stopPropagation();
});
// prevent drag propagation
domDelegate.bind(container, ENTRY_SELECTOR, 'dragstart', function(event) {
self.trigger('dragstart', event);
});
eventBus.on('canvas.resized', this._layoutChanged, this);
eventBus.fire('palette.create', {
container: container
});
};
/**
* Update palette state.
*
* @param {Object} [state] { open, twoColumn }
*/
Palette.prototype._toggleState = function(state) {
state = state || {};
var parent = this._getParentContainer(),
container = this._container;
var eventBus = this._eventBus;
var twoColumn;
var cls = domClasses(container);
if ('twoColumn' in state) {
twoColumn = state.twoColumn;
} else {
twoColumn = this._needsCollapse(parent.clientHeight, this._entries || {});
}
// always update two column
cls.toggle(PALETTE_TWO_COLUMN_CLS, twoColumn);
if ('open' in state) {
cls.toggle(PALETTE_OPEN_CLS, state.open);
}
eventBus.fire('palette.changed', {
twoColumn: twoColumn,
open: this.isOpen()
});
};
Palette.prototype._update = function() {
var entriesContainer = domQuery('.djs-palette-entries', this._container),
entries = this._entries = this.getEntries();
domClear(entriesContainer);
forEach(entries, function(entry, id) {
var grouping = entry.group || 'default';
var container = domQuery('[data-group=' + grouping + ']', entriesContainer);
if (!container) {
container = domify('<div class="group" data-group="' + grouping + '"></div>');
entriesContainer.appendChild(container);
}
var html = entry.html || (
entry.separator ?
'<hr class="separator" />' :
'<div class="entry" draggable="true"></div>');
var control = domify(html);
container.appendChild(control);
Eif (!entry.separator) {
domAttr(control, 'data-action', id);
Iif (entry.title) {
domAttr(control, 'title', entry.title);
}
if (entry.className) {
addClasses(control, entry.className);
}
if (entry.imageUrl) {
control.appendChild(domify('<img src="' + entry.imageUrl + '">'));
}
}
});
// open after update
this.open();
};
/**
* Trigger an action available on the palette
*
* @param {String} action
* @param {Event} event
*/
Palette.prototype.trigger = function(action, event, autoActivate) {
var entries = this._entries,
entry,
handler,
originalEvent,
button = event.delegateTarget || event.target;
if (!button) {
return event.preventDefault();
}
entry = entries[domAttr(button, 'data-action')];
// when user clicks on the palette and not on an action
if (!entry) {
return;
}
handler = entry.action;
originalEvent = event.originalEvent || event;
// simple action (via callback function)
if (isFunction(handler)) {
if (action === 'click') {
handler(originalEvent, autoActivate);
}
} else {
if (handler[action]) {
handler[action](originalEvent, autoActivate);
}
}
// silence other actions
event.preventDefault();
};
Palette.prototype._layoutChanged = function() {
this._toggleState({});
};
/**
* Do we need to collapse to two columns?
*
* @param {Number} availableHeight
* @param {Object} entries
*
* @return {Boolean}
*/
Palette.prototype._needsCollapse = function(availableHeight, entries) {
// top margin + bottom toggle + bottom margin
// implementors must override this method if they
// change the palette styles
var margin = 20 + 10 + 20;
var entriesHeight = Object.keys(entries).length * 46;
return availableHeight < entriesHeight + margin;
};
/**
* Close the palette
*/
Palette.prototype.close = function() {
this._toggleState({
open: false,
twoColumn: false
});
};
/**
* Open the palette
*/
Palette.prototype.open = function() {
this._toggleState({ open: true });
};
Palette.prototype.toggle = function(open) {
if (this.isOpen()) {
this.close();
} else {
this.open();
}
};
Palette.prototype.isActiveTool = function(tool) {
return tool && this._activeTool === tool;
};
Palette.prototype.updateToolHighlight = function(name) {
var entriesContainer,
toolsContainer;
if (!this._toolsContainer) {
entriesContainer = domQuery('.djs-palette-entries', this._container);
this._toolsContainer = domQuery('[data-group=tools]', entriesContainer);
}
toolsContainer = this._toolsContainer;
forEach(toolsContainer.children, function(tool) {
var actionName = tool.getAttribute('data-action');
if (!actionName) {
return;
}
var toolClasses = domClasses(tool);
actionName = actionName.replace('-tool', '');
if (toolClasses.contains('entry') && actionName === name) {
toolClasses.add('highlighted-entry');
} else {
toolClasses.remove('highlighted-entry');
}
});
};
/**
* Return true if the palette is opened.
*
* @example
*
* palette.open();
*
* if (palette.isOpen()) {
* // yes, we are open
* }
*
* @return {boolean} true if palette is opened
*/
Palette.prototype.isOpen = function() {
return domClasses(this._container).has(PALETTE_OPEN_CLS);
};
/**
* Get container the palette lives in.
*
* @return {Element}
*/
Palette.prototype._getParentContainer = function() {
return this._canvas.getContainer();
};
/* markup definition */
Palette.HTML_MARKUP =
'<div class="djs-palette">' +
'<div class="djs-palette-entries"></div>' +
'<div class="djs-palette-toggle"></div>' +
'</div>';
// helpers //////////////////////
function addClasses(element, classNames) {
var classes = domClasses(element);
var actualClassNames = isArray(classNames) ? classNames : classNames.split(/\s+/g);
actualClassNames.forEach(function(cls) {
classes.add(cls);
});
}
|