mirror of
https://github.com/Jermolene/TiddlyWiki5
synced 2024-08-19 22:26:18 +00:00
206 lines
5.9 KiB
JavaScript
206 lines
5.9 KiB
JavaScript
/*\
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title: $:/core/modules/widgets/dropzone.js
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type: application/javascript
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module-type: widget
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Dropzone 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 DropZoneWidget = 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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DropZoneWidget.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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DropZoneWidget.prototype.render = function(parent,nextSibling) {
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var self = this;
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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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// Create element
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var domNode = this.document.createElement("div");
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domNode.className = "tw-dropzone";
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// Add event handlers
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$tw.utils.addEventListeners(domNode,[
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{name: "dragenter", handlerObject: this, handlerMethod: "handleDragEnterEvent"},
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{name: "dragover", handlerObject: this, handlerMethod: "handleDragOverEvent"},
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{name: "dragleave", handlerObject: this, handlerMethod: "handleDragLeaveEvent"},
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{name: "drop", handlerObject: this, handlerMethod: "handleDropEvent"},
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{name: "paste", handlerObject: this, handlerMethod: "handlePasteEvent"}
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]);
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domNode.addEventListener("click",function (event) {
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},false);
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// Insert element
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parent.insertBefore(domNode,nextSibling);
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this.renderChildren(domNode,null);
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this.domNodes.push(domNode);
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};
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DropZoneWidget.prototype.handleDragEnterEvent = function(event) {
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// We count enter/leave events
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this.dragEnterCount = (this.dragEnterCount || 0) + 1;
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// If we're entering for the first time we need to apply highlighting
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if(this.dragEnterCount === 1) {
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$tw.utils.addClass(this.domNodes[0],"tw-dragover");
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}
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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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};
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DropZoneWidget.prototype.handleDragOverEvent = function(event) {
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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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event.dataTransfer.dropEffect = "copy"; // Explicitly show this is a copy
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};
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DropZoneWidget.prototype.handleDragLeaveEvent = function(event) {
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// Reduce the enter count
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this.dragEnterCount = (this.dragEnterCount || 0) - 1;
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// Remove highlighting if we're leaving externally
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if(this.dragEnterCount <= 0) {
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$tw.utils.removeClass(this.domNodes[0],"tw-dragover");
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}
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};
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DropZoneWidget.prototype.handleDropEvent = function(event) {
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var self = this,
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dataTransfer = event.dataTransfer;
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// Reset the enter count
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this.dragEnterCount = 0;
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// Remove highlighting
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$tw.utils.removeClass(this.domNodes[0],"tw-dragover");
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// Try to import the various data types we understand
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this.importData(dataTransfer);
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// Import any files in the drop
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this.wiki.readFiles(dataTransfer.files,function(tiddlerFields) {
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self.dispatchEvent({type: "tw-import-tiddlers", param: JSON.stringify([tiddlerFields])});
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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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};
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DropZoneWidget.prototype.importData = function(dataTransfer) {
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// Try each provided data type in turn
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for(var t=0; t<this.importDataTypes.length; t++) {
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// Get the data
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var dataType = this.importDataTypes[t];
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try {
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var data = dataTransfer.getData(dataType.type);
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} catch(e) {
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if(e.description !== "Invalid argument.") {
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throw e; // Deal with formats that IE doesn't support
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}
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}
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// Import the tiddlers in the data
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if(data !== "" && data !== null) {
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var tiddlerFields = dataType.convertToFields(data);
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if(!tiddlerFields.title) {
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tiddlerFields.title = this.wiki.generateNewTitle("Untitled");
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}
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this.dispatchEvent({type: "tw-import-tiddlers", param: JSON.stringify([tiddlerFields])});
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return;
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}
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};
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};
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DropZoneWidget.prototype.importDataTypes = [
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{type: "text/vnd.tiddler", convertToFields: function(data) {
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return JSON.parse(data);
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}},
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{type: "URL", convertToFields: function(data) {
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// Check for tiddler data URI
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var match = decodeURI(data).match(/^data\:text\/vnd\.tiddler,(.*)/i);
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if(match) {
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return JSON.parse(match[1]);
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} else {
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return { // As URL string
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text: data
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};
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}
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}},
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{type: "text/plain", convertToFields: function(data) {
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return {
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text: data
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};
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}},
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{type: "Text", convertToFields: function(data) {
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return {
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text: data
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};
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}},
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{type: "text/uri-list", convertToFields: function(data) {
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return {
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text: data
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};
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}}
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];
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DropZoneWidget.prototype.handlePasteEvent = function(event) {
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// Let the browser handle it if we're in a textarea or input box
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if(["TEXTAREA","INPUT"].indexOf(event.target.tagName) == -1) {
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var self = this,
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items = event.clipboardData.items;
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// Enumerate the clipboard items
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for(var t = 0; t<items.length; t++) {
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var item = items[t];
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if(item.kind === "file") {
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// Import any files
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this.wiki.readFile(item.getAsFile(),function(tiddlerFields) {
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self.dispatchEvent({type: "tw-import-tiddlers", param: JSON.stringify([tiddlerFields])});
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});
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} else if(item.kind === "string") {
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// Create tiddlers from string items
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item.getAsString(function(str) {
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var tiddlerFields = {
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title: self.wiki.generateNewTitle("Untitled"),
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text: str
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};
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self.dispatchEvent({type: "tw-import-tiddlers", param: JSON.stringify([tiddlerFields])});
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});
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}
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}
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// Tell the browser that we've handled the paste
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event.stopPropagation();
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event.preventDefault();
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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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DropZoneWidget.prototype.execute = function() {
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// Make child widgets
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this.makeChildWidgets();
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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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DropZoneWidget.prototype.refresh = function(changedTiddlers) {
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return this.refreshChildren(changedTiddlers);
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};
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exports.dropzone = DropZoneWidget;
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})();
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