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Code Issues Releases Wiki Activity

Extend the link widget to make the links draggable

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This commit is contained in:
Jeremy Ruston 2013-10-26 08:36:43 +01:00
parent 05fc9848bb
commit 98da59be7a
1 changed files with 46 additions and 1 deletions
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47
core/modules/new_widgets/link.js
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@ -75,7 +75,9 @@ LinkWidget.prototype.renderLink = function(parent,nextSibling) {
domNode.setAttribute("href",wikiLinkText);
// Add a click event handler
$tw.utils.addEventListeners(domNode,[
{name: "click", handlerObject: this, handlerMethod: "handleClickEvent"}
{name: "click", handlerObject: this, handlerMethod: "handleClickEvent"},
{name: "dragstart", handlerObject: this, handlerMethod: "handleDragStartEvent"},
{name: "dragend", handlerObject: this, handlerMethod: "handleDragEndEvent"}
]);
// Insert the link into the DOM and render any children
parent.insertBefore(domNode,nextSibling);
@ -98,6 +100,49 @@ LinkWidget.prototype.handleClickEvent = function (event) {
return false;
};
LinkWidget.prototype.handleDragStartEvent = function(event) {
if(this.to) {
// Set the dragging class on the element being dragged
$tw.utils.addClass(event.target,"tw-tiddlylink-dragging");
// Create the drag image elements
this.dragImage = this.document.createElement("div");
this.dragImage.className = "tw-tiddler-dragger";
var inner = this.document.createElement("div");
inner.className = "tw-tiddler-dragger-inner";
inner.appendChild(this.document.createTextNode(this.to));
this.dragImage.appendChild(inner);
this.document.body.appendChild(this.dragImage);
// Astoundingly, we need to cover the dragger up: http://www.kryogenix.org/code/browser/custom-drag-image.html
var bounds = this.dragImage.firstChild.getBoundingClientRect(),
cover = this.document.createElement("div");
cover.className = "tw-tiddler-dragger-cover";
cover.style.left = (bounds.left - 8) + "px";
cover.style.top = (bounds.top - 8) + "px";
cover.style.width = (bounds.width + 16) + "px";
cover.style.height = (bounds.height + 16) + "px";
this.dragImage.appendChild(cover);
// Set the data transfer properties
var dataTransfer = event.dataTransfer;
dataTransfer.effectAllowed = "copy";
dataTransfer.setDragImage(this.dragImage.firstChild,-16,-16);
dataTransfer.clearData();
dataTransfer.setData("text/vnd.tiddler",this.wiki.getTiddlerAsJson(this.to));
dataTransfer.setData("text/plain",this.wiki.getTiddlerText(this.to,""));
event.stopPropagation();
} else {
event.preventDefault();
}
};
LinkWidget.prototype.handleDragEndEvent = function(event) {
// Remove the dragging class on the element being dragged
$tw.utils.removeClass(event.target,"tw-tiddlylink-dragging");
// Delete the drag image element
if(this.dragImage) {
this.dragImage.parentNode.removeChild(this.dragImage);
}
};
/*
Compute the internal state of the widget
*/