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TiddlyWiki5/core/modules/widgets/import.js

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JavaScript
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/*\
title: $:/core/modules/widgets/import.js
type: application/javascript
module-type: widget
Implements the import widget.
```
<$import>
Import using the "browse..." button or drag files onto this text
</$import>
```
\*/
(function(){
/*jslint node: true, browser: true */
/*global $tw: false */
"use strict";
var ImportWidget = function(renderer) {
// Save state
this.renderer = renderer;
// Generate child nodes
this.generate();
};
ImportWidget.prototype.generate = function() {
// Get the parameters from the attributes
this.browse = this.renderer.getAttribute("browse","yes");
this["class"] = this.renderer.getAttribute("class");
// Compute classes
var classes = ["tw-import"];
if(this["class"]) {
$tw.utils.pushTop(classes,this["class"]);
}
// Create the file input and container elements
var fileInput = {
type: "element",
tag: "input",
attributes: {
type: {type: "string", value: "file"},
style: {type: "string", value: this.browse === "no" ? "display: none;" : "display: block;"}
},
events: [{name: "change", handlerObject: this, handlerMethod: "handleChangeEvent"}]
},
container = {
type: "element",
tag: "div",
children: this.renderer.parseTreeNode.children,
events: [
{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"}]
};
// Set the return element
this.tag = "div";
this.attributes = {
"class": classes.join(" ")
};
this.children = this.renderer.renderTree.createRenderers(this.renderer,[fileInput,container]);
};
ImportWidget.prototype.handleChangeEvent = function(event) {
event.stopPropagation();
this.importFiles(event.target.files);
};
ImportWidget.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.renderer.domNode,"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();
};
ImportWidget.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
};
ImportWidget.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.renderer.domNode,"tw-dragover");
}
};
ImportWidget.prototype.handleDropEvent = function(event) {
var dataTransfer = event.dataTransfer;
// Reset the enter count
this.dragEnterCount = 0;
// Remove highlighting
$tw.utils.removeClass(this.renderer.domNode,"tw-dragover");
// Try to import the various data types we understand
this.importData(dataTransfer);
// Import any files in the drop
this.importFiles(dataTransfer.files);
// Tell the browser that we handled the drop
event.preventDefault();
// Stop the drop ripple up to any parent handlers
event.stopPropagation();
};
ImportWidget.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
var file = item.getAsFile();
this.importFiles([file]);
} else if(item.kind === "string") {
// Create tiddlers from string items
item.getAsString(function(str) {
var fields = {
title: self.generateTitle("Untitled"),
text: str
};
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self.storeTiddler(fields);
self.openTiddler(fields.title);
});
}
}
// Tell the browser that we've handled the paste
event.stopPropagation();
event.preventDefault();
}
};
ImportWidget.prototype.openTiddler = function(title) {
$tw.utils.dispatchCustomEvent(this.renderer.domNode,"tw-navigate",{
navigateTo: title,
navigateFromNode: this.renderer.domNode,
navigateFromClientRect: this.renderer.domNode.getBoundingClientRect()
});
};
ImportWidget.prototype.importData = function(dataTransfer) {
for(var t=0; t<this.importDataTypes.length; t++) {
var dataType = this.importDataTypes[t];
var data = dataTransfer.getData(dataType.type);
if(data !== "") {
var fields = dataType.handler(data);
if(!fields.title) {
fields.title = this.generateTitle("Untitled");
}
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this.storeTiddler(fields);
this.openTiddler(fields.title);
return;
}
};
};
ImportWidget.prototype.importDataTypes = [
{type: "text/vnd.tiddler", handler: function(data) {
return JSON.parse(data);
}},
{type: "text/plain", handler: function(data) {
return {
text: data
};
}},
{type: "text/uri-list", handler: function(data) {
return {
text: data
};
}}
];
ImportWidget.prototype.importFiles = function(files) {
var self = this,
importFile = function(file) {
// Get the type, falling back to the filename extension
var type = file.type;
if(type === "" || !type) {
var dotPos = file.name.lastIndexOf(".");
if(dotPos !== -1) {
var fileExtensionInfo = $tw.config.fileExtensionInfo[file.name.substr(dotPos)];
if(fileExtensionInfo) {
type = fileExtensionInfo.type;
}
}
}
// Figure out if we're reading a binary file
var contentTypeInfo = $tw.config.contentTypeInfo[type],
isBinary = contentTypeInfo ? contentTypeInfo.encoding === "base64" : false;
// Create the FileReader
var reader = new FileReader();
reader.onload = function(event) {
// Deserialise the file contents
var fields = {
title: file.name || "Untitled",
type: type};
// Are we binary?
if(isBinary) {
var commaPos = event.target.result.indexOf(",");
if(commaPos !== -1) {
fields.text = event.target.result.substr(commaPos+1);
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self.storeTiddler(fields);
self.openTiddler(fields.title);
}
} else {
var tiddlers = self.renderer.renderTree.wiki.deserializeTiddlers(type,event.target.result,fields);
if(!tiddlers) {
console.log("No tiddlers found in file ",file.name);
} else {
$tw.utils.each(tiddlers,function(tiddlerFields) {
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tiddlerFields.title = self.generateTitle(tiddlerFields.title);
self.storeTiddler(tiddlerFields);
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self.openTiddler(tiddlerFields.title);
});
}
}
};
if(isBinary) {
reader.readAsDataURL(file);
} else {
reader.readAsText(file);
}
};
for(var f=0; f<files.length; f++) {
importFile(files[f]);
};
};
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ImportWidget.prototype.storeTiddler = function(fields) {
this.renderer.renderTree.wiki.addTiddler(new $tw.Tiddler(fields,this.renderer.renderTree.wiki.getModificationFields()));
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};
ImportWidget.prototype.generateTitle = function(baseTitle) {
var c = 0;
do {
var title = baseTitle + (c ? " " + (c + 1) : "");
c++;
} while(this.renderer.renderTree.wiki.tiddlerExists(title));
return title;
};
exports.import = ImportWidget;
})();