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TiddlyWiki5/core/modules/widgets/dropzone.js

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/*\
title: $:/core/modules/widgets/dropzone.js
type: application/javascript
module-type: widget
Dropzone widget
\*/
(function(){
/*jslint node: true, browser: true */
/*global $tw: false */
"use strict";
var Widget = require("$:/core/modules/widgets/widget.js").widget;
var DropZoneWidget = function(parseTreeNode,options) {
this.initialise(parseTreeNode,options);
};
/*
Inherit from the base widget class
*/
DropZoneWidget.prototype = new Widget();
/*
Render this widget into the DOM
*/
DropZoneWidget.prototype.render = function(parent,nextSibling) {
var self = this;
// Remember parent
this.parentDomNode = parent;
// Compute attributes and execute state
this.computeAttributes();
this.execute();
// Create element
var domNode = this.document.createElement("div");
domNode.className = "tw-dropzone";
// Add event handlers
$tw.utils.addEventListeners(domNode,[
{name: "dragenter", handlerObject: this, handlerMethod: "handleDragEnterEvent"},
{name: "dragover", handlerObject: this, handlerMethod: "handleDragOverEvent"},
{name: "dragleave", handlerObject: this, handlerMethod: "handleDragLeaveEvent"},
{name: "drop", handlerObject: this, handlerMethod: "handleDropEvent"},
{name: "paste", handlerObject: this, handlerMethod: "handlePasteEvent"}
]);
domNode.addEventListener("click",function (event) {
},false);
// Insert element
parent.insertBefore(domNode,nextSibling);
this.renderChildren(domNode,null);
this.domNodes.push(domNode);
};
DropZoneWidget.prototype.handleDragEnterEvent = function(event) {
// We count enter/leave events
this.dragEnterCount = (this.dragEnterCount || 0) + 1;
// If we're entering for the first time we need to apply highlighting
if(this.dragEnterCount === 1) {
$tw.utils.addClass(this.domNodes[0],"tw-dragover");
}
// Tell the browser that we're ready to handle the drop
event.preventDefault();
// Tell the browser not to ripple the drag up to any parent drop handlers
event.stopPropagation();
};
DropZoneWidget.prototype.handleDragOverEvent = function(event) {
// Tell the browser that we're still interested in the drop
event.preventDefault();
event.dataTransfer.dropEffect = "copy"; // Explicitly show this is a copy
};
DropZoneWidget.prototype.handleDragLeaveEvent = function(event) {
// Reduce the enter count
this.dragEnterCount = (this.dragEnterCount || 0) - 1;
// Remove highlighting if we're leaving externally
if(this.dragEnterCount <= 0) {
$tw.utils.removeClass(this.domNodes[0],"tw-dragover");
}
};
DropZoneWidget.prototype.handleDropEvent = function(event) {
var self = this,
dataTransfer = event.dataTransfer;
// Reset the enter count
this.dragEnterCount = 0;
// Remove highlighting
$tw.utils.removeClass(this.domNodes[0],"tw-dragover");
// Import any files in the drop
var numFiles = this.wiki.readFiles(dataTransfer.files,function(tiddlerFieldsArray) {
self.dispatchEvent({type: "tw-import-tiddlers", param: JSON.stringify(tiddlerFieldsArray)});
});
// Try to import the various data types we understand
if(numFiles === 0) {
this.importData(dataTransfer);
}
// Tell the browser that we handled the drop
event.preventDefault();
// Stop the drop ripple up to any parent handlers
event.stopPropagation();
};
DropZoneWidget.prototype.importData = function(dataTransfer) {
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// Try each provided data type in turn
for(var t=0; t<this.importDataTypes.length; t++) {
if(!$tw.browser.isIE || this.importDataTypes[t].IECompatible) {
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// Get the data
var dataType = this.importDataTypes[t];
var data = dataTransfer.getData(dataType.type);
// Import the tiddlers in the data
if(data !== "" && data !== null) {
var tiddlerFields = dataType.convertToFields(data);
if(!tiddlerFields.title) {
tiddlerFields.title = this.wiki.generateNewTitle("Untitled");
}
this.dispatchEvent({type: "tw-import-tiddlers", param: JSON.stringify([tiddlerFields])});
return;
}
}
};
};
DropZoneWidget.prototype.importDataTypes = [
{type: "text/vnd.tiddler", IECompatible: false, convertToFields: function(data) {
return JSON.parse(data);
}},
{type: "URL", IECompatible: true, convertToFields: function(data) {
// Check for tiddler data URI
var match = decodeURI(data).match(/^data\:text\/vnd\.tiddler,(.*)/i);
if(match) {
return JSON.parse(match[1]);
} else {
return { // As URL string
text: data
};
}
}},
{type: "text/x-moz-url", IECompatible: false, 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);
if(match) {
return JSON.parse(match[1]);
} else {
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return { // As URL string
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text: data
};
}
}},
{type: "text/plain", IECompatible: false, convertToFields: function(data) {
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return {
text: data
};
}},
{type: "Text", IECompatible: true, convertToFields: function(data) {
return {
text: data
};
}},
{type: "text/uri-list", IECompatible: false, convertToFields: function(data) {
return {
text: data
};
}}
];
DropZoneWidget.prototype.handlePasteEvent = function(event) {
// Let the browser handle it if we're in a textarea or input box
if(["TEXTAREA","INPUT"].indexOf(event.target.tagName) == -1) {
var self = this,
items = event.clipboardData.items;
// Enumerate the clipboard items
for(var t = 0; t<items.length; t++) {
var item = items[t];
if(item.kind === "file") {
// Import any files
this.wiki.readFile(item.getAsFile(),function(tiddlerFields) {
self.dispatchEvent({type: "tw-import-tiddlers", param: JSON.stringify([tiddlerFields])});
});
} else if(item.kind === "string") {
// Create tiddlers from string items
item.getAsString(function(str) {
var tiddlerFields = {
title: self.wiki.generateNewTitle("Untitled"),
text: str
};
self.dispatchEvent({type: "tw-import-tiddlers", param: JSON.stringify([tiddlerFields])});
});
}
}
// Tell the browser that we've handled the paste
event.stopPropagation();
event.preventDefault();
}
};
/*
Compute the internal state of the widget
*/
DropZoneWidget.prototype.execute = function() {
// Make child widgets
this.makeChildWidgets();
};
/*
Selectively refreshes the widget if needed. Returns true if the widget or any of its children needed re-rendering
*/
DropZoneWidget.prototype.refresh = function(changedTiddlers) {
return this.refreshChildren(changedTiddlers);
};
exports.dropzone = DropZoneWidget;
})();