mirror of
https://github.com/Jermolene/TiddlyWiki5
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177 lines
5.6 KiB
JavaScript
177 lines
5.6 KiB
JavaScript
/*\
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title: $:/core/modules/widgets/droppable.js
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type: application/javascript
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module-type: widget
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Droppable widget
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\*/
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(function(){
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/*jslint node: true, browser: true */
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/*global $tw: false */
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"use strict";
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var Widget = require("$:/core/modules/widgets/widget.js").widget;
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var DroppableWidget = function(parseTreeNode,options) {
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this.initialise(parseTreeNode,options);
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};
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/*
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Inherit from the base widget class
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*/
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DroppableWidget.prototype = new Widget();
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/*
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Render this widget into the DOM
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*/
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DroppableWidget.prototype.render = function(parent,nextSibling) {
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var self = this,
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tag = this.parseTreeNode.isBlock ? "div" : "span",
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domNode;
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// Remember parent
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this.parentDomNode = parent;
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// Compute attributes and execute state
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this.computeAttributes();
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this.execute();
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if(this.droppableTag && $tw.config.htmlUnsafeElements.indexOf(this.droppableTag) === -1) {
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tag = this.droppableTag;
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}
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// Create element and assign classes
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domNode = this.document.createElement(tag);
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this.domNode = domNode;
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this.assignDomNodeClasses();
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// Add event handlers
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if(this.droppableEnable) {
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$tw.utils.addEventListeners(domNode,[
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{name: "dragenter", handlerObject: this, handlerMethod: "handleDragEnterEvent"},
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{name: "dragover", handlerObject: this, handlerMethod: "handleDragOverEvent"},
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{name: "dragleave", handlerObject: this, handlerMethod: "handleDragLeaveEvent"},
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{name: "drop", handlerObject: this, handlerMethod: "handleDropEvent"}
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]);
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} else {
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$tw.utils.addClass(this.domNode,this.disabledClass);
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}
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// Insert element
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parent.insertBefore(domNode,nextSibling);
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this.renderChildren(domNode,null);
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this.domNodes.push(domNode);
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// Stack of outstanding enter/leave events
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this.currentlyEntered = [];
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};
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DroppableWidget.prototype.enterDrag = function(event) {
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if(this.currentlyEntered.indexOf(event.target) === -1) {
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this.currentlyEntered.push(event.target);
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}
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// If we're entering for the first time we need to apply highlighting
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$tw.utils.addClass(this.domNodes[0],"tc-dragover");
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};
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DroppableWidget.prototype.leaveDrag = function(event) {
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var pos = this.currentlyEntered.indexOf(event.target);
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if(pos !== -1) {
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this.currentlyEntered.splice(pos,1);
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}
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// Remove highlighting if we're leaving externally. The hacky second condition is to resolve a problem with Firefox whereby there is an erroneous dragenter event if the node being dragged is within the dropzone
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if(this.currentlyEntered.length === 0 || (this.currentlyEntered.length === 1 && this.currentlyEntered[0] === $tw.dragInProgress)) {
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this.currentlyEntered = [];
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if(this.domNodes[0]) {
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$tw.utils.removeClass(this.domNodes[0],"tc-dragover");
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}
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}
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};
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DroppableWidget.prototype.handleDragEnterEvent = function(event) {
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this.enterDrag(event);
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// Tell the browser that we're ready to handle the drop
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event.preventDefault();
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// Tell the browser not to ripple the drag up to any parent drop handlers
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event.stopPropagation();
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return false;
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};
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DroppableWidget.prototype.handleDragOverEvent = function(event) {
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// Check for being over a TEXTAREA or INPUT
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if(["TEXTAREA","INPUT"].indexOf(event.target.tagName) !== -1) {
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return false;
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}
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// Tell the browser that we're still interested in the drop
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event.preventDefault();
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// Set the drop effect
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event.dataTransfer.dropEffect = this.droppableEffect;
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return false;
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};
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DroppableWidget.prototype.handleDragLeaveEvent = function(event) {
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this.leaveDrag(event);
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return false;
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};
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DroppableWidget.prototype.handleDropEvent = function(event) {
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var self = this;
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this.leaveDrag(event);
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// Check for being over a TEXTAREA or INPUT
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if(["TEXTAREA","INPUT"].indexOf(event.target.tagName) !== -1) {
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return false;
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}
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var dataTransfer = event.dataTransfer;
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// Remove highlighting
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$tw.utils.removeClass(this.domNodes[0],"tc-dragover");
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// Try to import the various data types we understand
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$tw.utils.importDataTransfer(dataTransfer,null,function(fieldsArray) {
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fieldsArray.forEach(function(fields) {
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self.performActions(fields.title || fields.text,event);
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});
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});
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// Tell the browser that we handled the drop
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event.preventDefault();
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// Stop the drop ripple up to any parent handlers
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event.stopPropagation();
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return false;
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};
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DroppableWidget.prototype.performActions = function(title,event) {
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if(this.droppableActions) {
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var modifierKey = $tw.keyboardManager.getEventModifierKeyDescriptor(event);
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this.invokeActionString(this.droppableActions,this,event,{actionTiddler: title, modifier: modifierKey});
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}
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};
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/*
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Compute the internal state of the widget
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*/
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DroppableWidget.prototype.execute = function() {
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this.droppableActions = this.getAttribute("actions");
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this.droppableEffect = this.getAttribute("effect","copy");
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this.droppableTag = this.getAttribute("tag");
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this.droppableEnable = (this.getAttribute("enable") || "yes") === "yes";
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this.disabledClass = this.getAttribute("disabledClass","");
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// Make child widgets
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this.makeChildWidgets();
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};
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DroppableWidget.prototype.assignDomNodeClasses = function() {
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var classes = this.getAttribute("class","").split(" ");
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classes.push("tc-droppable");
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this.domNode.className = classes.join(" ");
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};
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/*
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Selectively refreshes the widget if needed. Returns true if the widget or any of its children needed re-rendering
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*/
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DroppableWidget.prototype.refresh = function(changedTiddlers) {
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var changedAttributes = this.computeAttributes();
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if(changedAttributes.tag || changedAttributes.enable || changedAttributes.disabledClass || changedAttributes.actions || changedAttributes.effect) {
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this.refreshSelf();
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return true;
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} else if(changedAttributes["class"]) {
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this.assignDomNodeClasses();
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}
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return this.refreshChildren(changedTiddlers);
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};
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exports.droppable = DroppableWidget;
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})(); |