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|
/* ************************************************************************
qooxdoo - the new era of web development
http://qooxdoo.org
Copyright:
2004-2007 1&1 Internet AG, Germany, http://www.1and1.org
License:
LGPL: http://www.gnu.org/licenses/lgpl.html
EPL: http://www.eclipse.org/org/documents/epl-v10.php
See the LICENSE file in the project's top-level directory for details.
Authors:
* Sebastian Werner (wpbasti)
* Andreas Ecker (ecker)
************************************************************************ */
/* ************************************************************************
#module(ui_dragdrop)
#load(qx.html.ElementFromPoint)
#embed(qx.widgettheme/cursors/*)
************************************************************************ */
/**
* This manager (singleton) manage all drag and drop handling of a qx.core.Init instance.
*/
qx.OO.defineClass("qx.event.handler.DragAndDropHandler", qx.manager.object.ObjectManager,
function()
{
qx.core.Target.call(this);
this._data = {};
this._actions = {};
this._cursors = {};
var vCursor;
for (var vAction in this._actionNames)
{
vCursor = this._cursors[vAction] = new qx.ui.basic.Image(this._cursorPath + vAction + "." + this._cursorFormat);
vCursor.setZIndex(1e8);
}
});
qx.OO.addProperty({ name : "sourceWidget", type : "object" });
qx.OO.addProperty({ name : "destinationWidget", type : "object" });
qx.OO.addProperty({ name : "cursor", type : "object" });
qx.OO.addProperty({ name : "currentAction", type : "string" });
/**
* The default delta x of the cursor feedback.
*
* @see #setCursorPosition
*/
qx.OO.addProperty({ name : "defaultCursorDeltaX", type : "number", defaultValue : 5, allowNull : false });
/**
* The default delta y of the cursor feedback.
*
* @see #setCursorPosition
*/
qx.OO.addProperty({ name : "defaultCursorDeltaY", type : "number", defaultValue : 15, allowNull : false });
qx.Proto._actionNames =
{
move : "move",
copy : "copy",
alias : "alias",
nodrop : "nodrop"
}
qx.Proto._cursorPath = "widget/cursors/";
qx.Proto._cursorFormat = "gif";
qx.Proto._lastDestinationEvent = null;
/*
---------------------------------------------------------------------------
COMMON MODIFIER
---------------------------------------------------------------------------
*/
qx.Proto._modifyDestinationWidget = function(propValue, propOldValue, propData)
{
if (propValue)
{
propValue.dispatchEvent(new qx.event.type.DragEvent("dragdrop", this._lastDestinationEvent, propValue, this.getSourceWidget()));
this._lastDestinationEvent = null;
}
return true;
}
/*
---------------------------------------------------------------------------
DATA HANDLING
---------------------------------------------------------------------------
*/
/*!
Add data of mimetype.
#param vMimeType[String]: A valid mimetype
#param vData[Any]: Any value for the mimetype
*/
qx.Proto.addData = function(vMimeType, vData) {
this._data[vMimeType] = vData;
}
qx.Proto.getData = function(vMimeType) {
return this._data[vMimeType];
}
qx.Proto.clearData = function() {
this._data = {};
}
/*
---------------------------------------------------------------------------
MIME TYPE HANDLING
---------------------------------------------------------------------------
*/
qx.Proto.getDropDataTypes = function()
{
var vDestination = this.getDestinationWidget();
var vDropTypes = [];
// If there is not any destination, simple return
if (!vDestination) {
return vDropTypes;
}
// Search for matching mimetypes
var vDropDataTypes = vDestination.getDropDataTypes();
for (var i=0, l=vDropDataTypes.length; i<l; i++) {
if (vDropDataTypes[i] in this._data) {
vDropTypes.push(vDropDataTypes[i]);
}
}
return vDropTypes;
}
/*
---------------------------------------------------------------------------
START DRAG
---------------------------------------------------------------------------
*/
/*!
This needed be called from any "dragstart" event to really start drag session.
*/
qx.Proto.startDrag = function()
{
if (!this._dragCache) {
throw new Error("Invalid usage of startDrag. Missing dragInfo!");
}
// Update status flag
this._dragCache.dragHandlerActive = true;
// Internal storage of source widget
this.setSourceWidget(this._dragCache.sourceWidget);
// Add feedback widget
if (this._feedbackWidget) {
this._feedbackWidget.setVisibility(false);
var doc = qx.ui.core.ClientDocument.getInstance();
doc.add(this._feedbackWidget);
}
}
/*
---------------------------------------------------------------------------
FIRE IMPLEMENTATION FOR USER EVENTS
---------------------------------------------------------------------------
*/
qx.Proto._fireUserEvents = function(fromWidget, toWidget, e)
{
if (fromWidget && fromWidget != toWidget && fromWidget.hasEventListeners("dragout")) {
fromWidget.dispatchEvent(new qx.event.type.DragEvent("dragout", e, fromWidget, toWidget), true);
}
if (toWidget)
{
if (fromWidget != toWidget && toWidget.hasEventListeners("dragover")) {
toWidget.dispatchEvent(new qx.event.type.DragEvent("dragover", e, toWidget, fromWidget), true);
}
if (toWidget.hasEventListeners("dragmove")) {
toWidget.dispatchEvent(new qx.event.type.DragEvent("dragmove", e, toWidget, null), true);
}
}
}
/*
---------------------------------------------------------------------------
HANDLER FOR MOUSE EVENTS
---------------------------------------------------------------------------
*/
/*!
This wraps the mouse events to custom handlers.
*/
qx.Proto.handleMouseEvent = function(e)
{
switch (e.getType())
{
case "mousedown":
return this._handleMouseDown(e);
case "mouseup":
return this._handleMouseUp(e);
case "mousemove":
return this._handleMouseMove(e);
}
}
/*!
This starts the core drag and drop session.
To really get drag and drop working you need to define
a function which you attach to "dragstart"-event, which
invokes at least this.startDrag()
*/
qx.Proto._handleMouseDown = function(e)
{
if (e.getDefaultPrevented() || ! e.isLeftButtonPressed()) {
return;
}
// Store initial dragCache
this._dragCache =
{
startScreenX : e.getScreenX(),
startScreenY : e.getScreenY(),
pageX : e.getPageX(),
pageY : e.getPageY(),
sourceWidget : e.getTarget(),
sourceTopLevel : e.getTarget().getTopLevelWidget(),
dragHandlerActive : false,
hasFiredDragStart : false
}
}
/*!
Handler for mouse move events
*/
qx.Proto._handleMouseMove = function(e)
{
// Return if dragCache was not filled before
if (!this._dragCache) {
return;
}
/*
Default handling if drag handler is activated
*/
if (this._dragCache.dragHandlerActive)
{
// Update page coordinates
this._dragCache.pageX = e.getPageX();
this._dragCache.pageY = e.getPageY();
// Get current target
var currentDropTarget = this.getDropTarget(e);
// Update action
this.setCurrentAction(currentDropTarget ? this._evalNewAction(e.isShiftPressed(), e.isCtrlPressed(), e.isAltPressed()) : null);
// Fire user events
this._fireUserEvents(this._dragCache.currentDropWidget, currentDropTarget, e);
// Store current widget
this._dragCache.currentDropWidget = currentDropTarget;
// Update cursor icon
this._renderCursor();
// Update user feedback
this._renderFeedbackWidget();
}
/*
Initial activation and fire of dragstart
*/
else if (!this._dragCache.hasFiredDragStart)
{
if (Math.abs(e.getScreenX() - this._dragCache.startScreenX) > 5 || Math.abs(e.getScreenY() - this._dragCache.startScreenY) > 5)
{
// Fire dragstart event to finally allow the above if to handle next events
this._dragCache.sourceWidget.dispatchEvent(new qx.event.type.DragEvent("dragstart", e, this._dragCache.sourceWidget), true);
// Update status flag
this._dragCache.hasFiredDragStart = true;
// Look if handler become active
if (this._dragCache.dragHandlerActive)
{
// Fire first user events
this._fireUserEvents(this._dragCache.currentDropWidget, this._dragCache.sourceWidget, e);
// Update status flags
this._dragCache.currentDropWidget = this._dragCache.sourceWidget;
// Activate capture for clientDocument
qx.ui.core.ClientDocument.getInstance().setCapture(true);
}
}
}
}
/*!
Handle mouse up event. Normally this finalize the drag and drop event.
*/
qx.Proto._handleMouseUp = function(e)
{
// Return if dragCache was not filled before
if (!this._dragCache) {
return;
}
if (this._dragCache.dragHandlerActive)
{
this._endDrag(this.getDropTarget(e), e);
}
else
{
// Clear drag cache
this._dragCache = null;
}
}
/*
---------------------------------------------------------------------------
HANDLER FOR KEY EVENTS
---------------------------------------------------------------------------
*/
/*!
This wraps the key events to custom handlers.
*/
qx.Proto.handleKeyEvent = function(e)
{
if (!this._dragCache) {
return;
}
switch (e.getType())
{
case "keydown":
this._handleKeyDown(e);
return;
case "keyup":
this._handleKeyUp(e);
return;
}
}
qx.Proto._handleKeyDown = function(e)
{
// Stop Drag on Escape
if (e.getKeyIdentifier() == "Escape")
{
this.cancelDrag(e);
}
// Update cursor and action on press of modifier keys
else if (this.getCurrentAction() != null)
{
// TODO this doesn't work in WebKit because WebKit doesn't fire keyevents for modifier keys
switch(e.getKeyIdentifier())
{
case "Shift":
case "Control":
case "Alt":
this.setAction(this._evalNewAction(e.isShiftPressed(), e.isCtrlPressed(), e.isAltPressed()));
this._renderCursor();
e.preventDefault();
}
}
}
qx.Proto._handleKeyUp = function(e)
{
// TODO this doesn't work in WebKit because WebKit doesn't fire keyevents for modifier keys
var bShiftPressed = e.getKeyIdentifier() == "Shift";
var bCtrlPressed = e.getKeyIdentifier() == "Control";
var bAltPressed = e.getKeyIdentifier() == "Alt";
if (bShiftPressed || bCtrlPressed || bAltPressed)
{
if (this.getCurrentAction() != null)
{
this.setAction(this._evalNewAction(!bShiftPressed && e.isShiftPressed(), ! bCtrlPressed && e.isCtrlPressed(), !bAltPressed && e.isAltPressed()));
this._renderCursor();
e.preventDefault();
}
}
}
/*
---------------------------------------------------------------------------
IMPLEMENTATION OF DRAG&DROP SESSION FINALISATION
---------------------------------------------------------------------------
*/
/*!
Cancel current drag and drop session
*/
qx.Proto.cancelDrag = function(e) {
// Return if dragCache was not filled before
if (!this._dragCache) {
return;
}
if (this._dragCache.dragHandlerActive)
{
this._endDrag(null, e);
}
else
{
// Clear drag cache
this._dragCache = null;
}
}
qx.Proto.globalCancelDrag = function()
{
if (this._dragCache && this._dragCache.dragHandlerActive) {
this._endDragCore();
}
}
/*!
This will be called to the end of each drag and drop session
*/
qx.Proto._endDrag = function(currentDestinationWidget, e)
{
// Use given destination widget
if (currentDestinationWidget)
{
this._lastDestinationEvent = e;
this.setDestinationWidget(currentDestinationWidget);
}
// Dispatch dragend event
this.getSourceWidget().dispatchEvent(new qx.event.type.DragEvent("dragend", e, this.getSourceWidget(), currentDestinationWidget), true);
// Fire dragout event
this._fireUserEvents(this._dragCache && this._dragCache.currentDropWidget, null, e);
// Call helper
this._endDragCore();
}
qx.Proto._endDragCore = function()
{
// Cleanup feedback widget
if (this._feedbackWidget) {
var doc = qx.ui.core.ClientDocument.getInstance();
doc.remove(this._feedbackWidget);
if (this._feedbackAutoDispose) {
this._feedbackWidget.dispose();
}
this._feedbackWidget = null;
}
// Remove cursor
var oldCursor = this.getCursor();
if (oldCursor)
{
oldCursor._style.display = "none";
this.forceCursor(null);
}
this._cursorDeltaX = null;
this._cursorDeltaY = null;
// Reset drag cache for next drag and drop session
if (this._dragCache)
{
this._dragCache.currentDropWidget = null;
this._dragCache = null;
}
// Deactivate capture for clientDocument
qx.ui.core.ClientDocument.getInstance().setCapture(false);
// Cleanup data and actions
this.clearData();
this.clearActions();
// Cleanup widgets
this.setSourceWidget(null);
this.setDestinationWidget(null);
}
/*
---------------------------------------------------------------------------
IMPLEMENTATION OF CURSOR UPDATES
---------------------------------------------------------------------------
*/
/**
* Sets the position of the cursor feedback (the icon showing whether dropping
* is allowed at the current position and which action a drop will do).
*
* @param deltaX {int} The number of pixels the top-left corner of the
* cursor feedback should be away from the mouse cursor in x direction.
* @param deltaY {int} The number of pixels the top-left corner of the
* cursor feedback should be away from the mouse cursor in y direction.
*/
qx.Proto.setCursorPosition = function(deltaX, deltaY) {
this._cursorDeltaX = deltaX;
this._cursorDeltaY = deltaY;
};
/*!
Select and setup the current used cursor
*/
qx.Proto._renderCursor = function()
{
var vNewCursor;
var vOldCursor = this.getCursor();
switch(this.getCurrentAction())
{
case this._actionNames.move:
vNewCursor = this._cursors.move;
break;
case this._actionNames.copy:
vNewCursor = this._cursors.copy;
break;
case this._actionNames.alias:
vNewCursor = this._cursors.alias;
break;
default:
vNewCursor = this._cursors.nodrop;
}
// Hide old cursor
if (vNewCursor != vOldCursor && vOldCursor != null) {
vOldCursor._style.display = "none";
}
// Ensure that the cursor is created
if (!vNewCursor._initialLayoutDone)
{
qx.ui.core.ClientDocument.getInstance().add(vNewCursor);
qx.ui.core.Widget.flushGlobalQueues();
}
// Apply position with runtime style (fastest qooxdoo method)
vNewCursor._applyRuntimeLeft(this._dragCache.pageX
+ ((this._cursorDeltaX != null) ? this._cursorDeltaX : this.getDefaultCursorDeltaX()));
vNewCursor._applyRuntimeTop(this._dragCache.pageY
+ ((this._cursorDeltaY != null) ? this._cursorDeltaY : this.getDefaultCursorDeltaY()));
// Finally show new cursor
if (vNewCursor != vOldCursor) {
vNewCursor._style.display = "";
}
// Store new cursor
this.forceCursor(vNewCursor);
}
/*
---------------------------------------------------------------------------
IMPLEMENTATION OF DROP TARGET VALIDATION
---------------------------------------------------------------------------
*/
qx.Proto.supportsDrop = function(vWidget)
{
var vTypes = vWidget.getDropDataTypes();
if (!vTypes) {
return false;
}
for (var i=0; i<vTypes.length; i++)
{
if (vTypes[i] in this._data) {
return true;
}
}
return false;
}
/*!
#param e[qx.event.type.MouseEvent]: Current MouseEvent for dragdrop action
*/
if (qx.core.Client.getInstance().isGecko())
{
qx.Proto.getDropTarget = function(e)
{
var vCurrent = e.getTarget();
// work around gecko bug (all other browsers are correct)
// clicking on a free space and drag prohibit the get of
// a valid event target. The target is always the element
// which was the one with the mousedown event before.
if (vCurrent == this._dragCache.sourceWidget)
{
// vCurrent = qx.event.handler.EventHandler.getTargetObject(qx.html.ElementFromPoint.getElementFromPoint(e.getPageX(), e.getPageY()));
// this is around 8-12 times faster as the above method
vCurrent = this._dragCache.sourceTopLevel.getWidgetFromPoint(e.getPageX(), e.getPageY());
}
else
{
vCurrent = qx.event.handler.EventHandler.getTargetObject(null, vCurrent);
}
while (vCurrent != null && vCurrent != this._dragCache.sourceWidget)
{
if (!vCurrent.supportsDrop(this._dragCache)) {
return null;
}
if (this.supportsDrop(vCurrent)) {
return vCurrent;
}
vCurrent = vCurrent.getParent();
}
return null;
}
}
else
{
qx.Proto.getDropTarget = function(e)
{
var vCurrent = e.getTarget();
while (vCurrent != null)
{
if (!vCurrent.supportsDrop(this._dragCache)) {
return null;
}
if (this.supportsDrop(vCurrent)) {
return vCurrent;
}
vCurrent = vCurrent.getParent();
}
return null;
}
}
/*
---------------------------------------------------------------------------
ACTION HANDLING
---------------------------------------------------------------------------
*/
qx.Proto.addAction = function(vAction, vForce)
{
this._actions[vAction] = true;
// Defaults to first added action
if (vForce || this.getCurrentAction() == null) {
this.setCurrentAction(vAction);
}
}
qx.Proto.clearActions = function()
{
this._actions = {};
this.setCurrentAction(null);
}
qx.Proto.removeAction = function(vAction)
{
delete this._actions[vAction];
// Reset current action on remove
if (this.getCurrentAction() == vAction) {
this.setCurrentAction(null);
}
}
qx.Proto.setAction = function(vAction)
{
if (vAction != null && !(vAction in this._actions)) {
this.addAction(vAction, true);
}
else
{
this.setCurrentAction(vAction);
}
}
qx.Proto._evalNewAction = function(vKeyShift, vKeyCtrl, vKeyAlt)
{
if (vKeyShift && vKeyCtrl && this._actionNames.alias in this._actions)
{
return this._actionNames.alias;
}
else if (vKeyShift && vKeyAlt && this._actionNames.copy in this._actions)
{
return this._actionNames.copy;
}
else if (vKeyShift && this._actionNames.move in this._actions)
{
return this._actionNames.move;
}
else if (vKeyAlt && this._actionNames.alias in this._actions)
{
return this._actionNames.alias;
}
else if (vKeyCtrl && this._actionNames.copy in this._actions)
{
return this._actionNames.copy;
}
else
{
// Return the first action found
for (var vAction in this._actions) {
return vAction;
}
}
return null;
}
/*
---------------------------------------------------------------------------
USER FEEDBACK SUPPORT
---------------------------------------------------------------------------
*/
/**
* Sets the widget to show as feedback for the user. This widget should
* represent the object(s) the user is dragging.
*
* @param widget {qx.ui.core.Widget} the feedback widget.
* @param deltaX {int ? 10} the number of pixels the top-left corner of the widget
* should be away from the mouse cursor in x direction.
* @param deltaY {int ? 10} the number of pixels the top-left corner of the widget
* should be away from the mouse cursor in y direction.
* @param autoDisposeWidget {boolean} whether the widget should be disposed when
* dragging is finished or cancelled.
*/
qx.Proto.setFeedbackWidget = function(widget, deltaX, deltaY, autoDisposeWidget) {
this._feedbackWidget = widget;
this._feedbackDeltaX = (deltaX != null) ? deltaX : 10;
this._feedbackDeltaY = (deltaY != null) ? deltaY : 10;
this._feedbackAutoDispose = autoDisposeWidget ? true : false;
};
/**
* Renders the user feedback widget at the correct location.
*/
qx.Proto._renderFeedbackWidget = function() {
if (this._feedbackWidget) {
this._feedbackWidget.setVisibility(true);
// Apply position with runtime style (fastest qooxdoo method)
this._feedbackWidget._applyRuntimeLeft(this._dragCache.pageX + this._feedbackDeltaX);
this._feedbackWidget._applyRuntimeTop(this._dragCache.pageY + this._feedbackDeltaY);
}
};
/*
---------------------------------------------------------------------------
DISPOSER
---------------------------------------------------------------------------
*/
qx.Proto.dispose = function()
{
if (this.getDisposed()) {
return;
}
// Reset drag cache for next drag and drop session
if (this._dragCache)
{
this._dragCache.currentDropWidget = null;
this._dragCache = null;
}
// Cleanup data and actions
this._data = null;
this._actions = null;
this._actionNames = null;
this._lastDestinationEvent = null;
if (this._cursors)
{
if (this._cursors.move)
{
this._cursors.move.dispose();
delete this._cursors.move;
}
if (this._cursors.copy)
{
this._cursors.copy.dispose();
delete this._cursors.copy;
}
if (this._cursors.alias)
{
this._cursors.alias.dispose();
delete this._cursors.alias;
}
if (this._cursors.nodrop)
{
this._cursors.nodrop.dispose();
delete this._cursors.nodrop;
}
this._cursors = null;
}
return qx.manager.object.ObjectManager.prototype.dispose.call(this);
}
/*
---------------------------------------------------------------------------
DEFER SINGLETON INSTANCE
---------------------------------------------------------------------------
*/
/**
* Singleton Instance Getter
*/
qx.Class.getInstance = qx.lang.Function.returnInstance;
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