/**
* A DragDrop implementation that inserts an empty, bordered div into
* the document that follows the cursor during drag operations. At the time of
* the click, the frame div is resized to the dimensions of the linked html
* element, and moved to the exact location of the linked element.
*
* References to the "frame" element refer to the single proxy element that
* was created to be dragged in place of all DDProxy elements on the
* page.
*
* @class DDProxy
* @extends YAHOO.util.DD
* @namespace YAHOO.util
* @constructor
* @param {String} id the id of the linked html element
* @param {String} sGroup the group of related DragDrop objects
* @param {object} config an object containing configurable attributes
* Valid properties for DDProxy in addition to those in DragDrop:
* resizeFrame, centerFrame, dragElId
*/
YAHOO.util.DDProxy = function(id, sGroup, config) {
if (id) {
this.init(id, sGroup, config);
this.initFrame();
}
};
/**
* The default drag frame div id
* @property YAHOO.util.DDProxy.dragElId
* @type String
* @static
*/
YAHOO.util.DDProxy.dragElId = "ygddfdiv";
YAHOO.extend(YAHOO.util.DDProxy, YAHOO.util.DD, {
/**
* By default we resize the drag frame to be the same size as the element
* we want to drag (this is to get the frame effect). We can turn it off
* if we want a different behavior.
* @property resizeFrame
* @type boolean
*/
resizeFrame: true,
/**
* By default the frame is positioned exactly where the drag element is, so
* we use the cursor offset provided by YAHOO.util.DD. Another option that works only if
* you do not have constraints on the obj is to have the drag frame centered
* around the cursor. Set centerFrame to true for this effect.
* @property centerFrame
* @type boolean
*/
centerFrame: false,
/**
* Creates the proxy element if it does not yet exist
* @method createFrame
*/
createFrame: function() {
var self=this, body=document.body;
if (!body || !body.firstChild) {
setTimeout( function() { self.createFrame(); }, 50 );
return;
}
var div=this.getDragEl(), Dom=YAHOO.util.Dom;
if (!div) {
div = document.createElement("div");
div.id = this.dragElId;
var s = div.style;
s.position = "absolute";
s.visibility = "hidden";
s.cursor = "move";
s.border = "2px solid #aaa";
s.zIndex = 999;
s.height = "25px";
s.width = "25px";
var _data = document.createElement('div');
Dom.setStyle(_data, 'height', '100%');
Dom.setStyle(_data, 'width', '100%');
/**
* If the proxy element has no background-color, then it is considered to the "transparent" by Internet Explorer.
* Since it is "transparent" then the events pass through it to the iframe below.
* So creating a "fake" div inside the proxy element and giving it a background-color, then setting it to an
* opacity of 0, it appears to not be there, however IE still thinks that it is so the events never pass through.
*/
Dom.setStyle(_data, 'background-color', '#ccc');
Dom.setStyle(_data, 'opacity', '0');
div.appendChild(_data);
// appendChild can blow up IE if invoked prior to the window load event
// while rendering a table. It is possible there are other scenarios
// that would cause this to happen as well.
body.insertBefore(div, body.firstChild);
}
},
/**
* Initialization for the drag frame element. Must be called in the
* constructor of all subclasses
* @method initFrame
*/
initFrame: function() {
this.createFrame();
},
applyConfig: function() {
//this.logger.log("DDProxy applyConfig");
YAHOO.util.DDProxy.superclass.applyConfig.call(this);
this.resizeFrame = (this.config.resizeFrame !== false);
this.centerFrame = (this.config.centerFrame);
this.setDragElId(this.config.dragElId || YAHOO.util.DDProxy.dragElId);
},
/**
* Resizes the drag frame to the dimensions of the clicked object, positions
* it over the object, and finally displays it
* @method showFrame
* @param {int} iPageX X click position
* @param {int} iPageY Y click position
* @private
*/
showFrame: function(iPageX, iPageY) {
var el = this.getEl();
var dragEl = this.getDragEl();
var s = dragEl.style;
this._resizeProxy();
if (this.centerFrame) {
this.setDelta( Math.round(parseInt(s.width, 10)/2),
Math.round(parseInt(s.height, 10)/2) );
}
this.setDragElPos(iPageX, iPageY);
YAHOO.util.Dom.setStyle(dragEl, "visibility", "visible");
},
/**
* The proxy is automatically resized to the dimensions of the linked
* element when a drag is initiated, unless resizeFrame is set to false
* @method _resizeProxy
* @private
*/
_resizeProxy: function() {
if (this.resizeFrame) {
var DOM = YAHOO.util.Dom;
var el = this.getEl();
var dragEl = this.getDragEl();
var bt = parseInt( DOM.getStyle(dragEl, "borderTopWidth" ), 10);
var br = parseInt( DOM.getStyle(dragEl, "borderRightWidth" ), 10);
var bb = parseInt( DOM.getStyle(dragEl, "borderBottomWidth" ), 10);
var bl = parseInt( DOM.getStyle(dragEl, "borderLeftWidth" ), 10);
if (isNaN(bt)) { bt = 0; }
if (isNaN(br)) { br = 0; }
if (isNaN(bb)) { bb = 0; }
if (isNaN(bl)) { bl = 0; }
this.logger.log("proxy size: " + bt + " " + br + " " + bb + " " + bl);
var newWidth = Math.max(0, el.offsetWidth - br - bl);
var newHeight = Math.max(0, el.offsetHeight - bt - bb);
this.logger.log("Resizing proxy element");
DOM.setStyle( dragEl, "width", newWidth + "px" );
DOM.setStyle( dragEl, "height", newHeight + "px" );
}
},
// overrides YAHOO.util.DragDrop
b4MouseDown: function(e) {
this.setStartPosition();
var x = YAHOO.util.Event.getPageX(e);
var y = YAHOO.util.Event.getPageY(e);
this.autoOffset(x, y);
// This causes the autoscroll code to kick off, which means autoscroll can
// happen prior to the check for a valid drag handle.
// this.setDragElPos(x, y);
},
// overrides YAHOO.util.DragDrop
b4StartDrag: function(x, y) {
// show the drag frame
this.logger.log("start drag show frame, x: " + x + ", y: " + y);
this.showFrame(x, y);
},
// overrides YAHOO.util.DragDrop
b4EndDrag: function(e) {
this.logger.log(this.id + " b4EndDrag");
YAHOO.util.Dom.setStyle(this.getDragEl(), "visibility", "hidden");
},
// overrides YAHOO.util.DragDrop
// By default we try to move the element to the last location of the frame.
// This is so that the default behavior mirrors that of YAHOO.util.DD.
endDrag: function(e) {
var DOM = YAHOO.util.Dom;
this.logger.log(this.id + " endDrag");
var lel = this.getEl();
var del = this.getDragEl();
// Show the drag frame briefly so we can get its position
// del.style.visibility = "";
DOM.setStyle(del, "visibility", "");
// Hide the linked element before the move to get around a Safari
// rendering bug.
//lel.style.visibility = "hidden";
DOM.setStyle(lel, "visibility", "hidden");
YAHOO.util.DDM.moveToEl(lel, del);
//del.style.visibility = "hidden";
DOM.setStyle(del, "visibility", "hidden");
//lel.style.visibility = "";
DOM.setStyle(lel, "visibility", "");
},
toString: function() {
return ("DDProxy " + this.id);
}
/**
* @event mouseDownEvent
* @description Provides access to the mousedown event. The mousedown does not always result in a drag operation.
* @type YAHOO.util.CustomEvent See <a href="YAHOO.util.Element.html#addListener">Element.addListener</a> for more information on listening for this event.
*/
/**
* @event b4MouseDownEvent
* @description Provides access to the mousedown event, before the mouseDownEvent gets fired. Returning false will cancel the drag.
* @type YAHOO.util.CustomEvent See <a href="YAHOO.util.Element.html#addListener">Element.addListener</a> for more information on listening for this event.
*/
/**
* @event mouseUpEvent
* @description Fired from inside DragDropMgr when the drag operation is finished.
* @type YAHOO.util.CustomEvent See <a href="YAHOO.util.Element.html#addListener">Element.addListener</a> for more information on listening for this event.
*/
/**
* @event b4StartDragEvent
* @description Fires before the startDragEvent, returning false will cancel the startDrag Event.
* @type YAHOO.util.CustomEvent See <a href="YAHOO.util.Element.html#addListener">Element.addListener</a> for more information on listening for this event.
*/
/**
* @event startDragEvent
* @description Occurs after a mouse down and the drag threshold has been met. The drag threshold default is either 3 pixels of mouse movement or 1 full second of holding the mousedown.
* @type YAHOO.util.CustomEvent See <a href="YAHOO.util.Element.html#addListener">Element.addListener</a> for more information on listening for this event.
*/
/**
* @event b4EndDragEvent
* @description Fires before the endDragEvent. Returning false will cancel.
* @type YAHOO.util.CustomEvent See <a href="YAHOO.util.Element.html#addListener">Element.addListener</a> for more information on listening for this event.
*/
/**
* @event endDragEvent
* @description Fires on the mouseup event after a drag has been initiated (startDrag fired).
* @type YAHOO.util.CustomEvent See <a href="YAHOO.util.Element.html#addListener">Element.addListener</a> for more information on listening for this event.
*/
/**
* @event dragEvent
* @description Occurs every mousemove event while dragging.
* @type YAHOO.util.CustomEvent See <a href="YAHOO.util.Element.html#addListener">Element.addListener</a> for more information on listening for this event.
*/
/**
* @event b4DragEvent
* @description Fires before the dragEvent.
* @type YAHOO.util.CustomEvent See <a href="YAHOO.util.Element.html#addListener">Element.addListener</a> for more information on listening for this event.
*/
/**
* @event invalidDropEvent
* @description Fires when the dragged objects is dropped in a location that contains no drop targets.
* @type YAHOO.util.CustomEvent See <a href="YAHOO.util.Element.html#addListener">Element.addListener</a> for more information on listening for this event.
*/
/**
* @event b4DragOutEvent
* @description Fires before the dragOutEvent
* @type YAHOO.util.CustomEvent See <a href="YAHOO.util.Element.html#addListener">Element.addListener</a> for more information on listening for this event.
*/
/**
* @event dragOutEvent
* @description Fires when a dragged object is no longer over an object that had the onDragEnter fire.
* @type YAHOO.util.CustomEvent See <a href="YAHOO.util.Element.html#addListener">Element.addListener</a> for more information on listening for this event.
*/
/**
* @event dragEnterEvent
* @description Occurs when the dragged object first interacts with another targettable drag and drop object.
* @type YAHOO.util.CustomEvent See <a href="YAHOO.util.Element.html#addListener">Element.addListener</a> for more information on listening for this event.
*/
/**
* @event b4DragOverEvent
* @description Fires before the dragOverEvent.
* @type YAHOO.util.CustomEvent See <a href="YAHOO.util.Element.html#addListener">Element.addListener</a> for more information on listening for this event.
*/
/**
* @event dragOverEvent
* @description Fires every mousemove event while over a drag and drop object.
* @type YAHOO.util.CustomEvent See <a href="YAHOO.util.Element.html#addListener">Element.addListener</a> for more information on listening for this event.
*/
/**
* @event b4DragDropEvent
* @description Fires before the dragDropEvent
* @type YAHOO.util.CustomEvent See <a href="YAHOO.util.Element.html#addListener">Element.addListener</a> for more information on listening for this event.
*/
/**
* @event dragDropEvent
* @description Fires when the dragged objects is dropped on another.
* @type YAHOO.util.CustomEvent See <a href="YAHOO.util.Element.html#addListener">Element.addListener</a> for more information on listening for this event.
*/
});