org.vectomatic.svg.edit.client.command.dnd

Interface IDndHandler

All Known Implementing Classes:

DndCopyHandler, DndHandlerBase, DndLinkHandler, DndMoveHandler

public interface IDndHandler

Interface for classes which interpret drag and drop input

Author:

laaglu

Method Summary

Modifier and Type	Method and Description
void	createCommands(List<SVGElementModel> sourceElements, SVGElementModel target, DndCommandFactory.DropGesture dropGesture) Creates the commands which represent the drag and drop operation
int	getKeyCode() Returns the key code associated with this handler
String	getMessage(List<SVGElementModel> sourceElements) Returns the text which appears in the ghost during a drag and drop operation
String	getOperationCssAttr() Returns the DOM attribute value which trigger the display of the proper icons in the drag ghost using a CSS rule
boolean	isValidSource(com.extjs.gxt.ui.client.event.DNDEvent event, List<SVGElementModel> sourceElements) Determines the feasibility of creating a command using the specified source elements as drag sources.
boolean	isValidTarget(List<SVGElementModel> sourceElements, SVGElementModel target) Determines if dropping on the specified target will result in a successful command creation.

Method Detail

isValidSource

boolean isValidSource(com.extjs.gxt.ui.client.event.DNDEvent event,
                      List<SVGElementModel> sourceElements)

Determines the feasibility of creating a command using the specified source elements as drag sources.

Parameters:

event - The drag and drop event

sourceElements - The elements being dragged

Returns:

True if the drag and drop operation can proceed, false if it should be completely blocked.

isValidTarget

boolean isValidTarget(List<SVGElementModel> sourceElements,
                      SVGElementModel target)

Determines if dropping on the specified target will result in a successful command creation.

Parameters:

sourceElements - The elements being dragged

target - The hovered target

Returns:

True if the target is authorized, false otherwise

createCommands

void createCommands(List<SVGElementModel> sourceElements,
                    SVGElementModel target,
                    DndCommandFactory.DropGesture dropGesture)

Creates the commands which represent the drag and drop operation

Parameters:

sourceElements - The drag source elements

target - The drop target elements

dropGesture - The drop gesture

getOperationCssAttr

String getOperationCssAttr()

Returns the DOM attribute value which trigger the display of the proper icons in the drag ghost using a CSS rule

Returns:

a DOM attribute value

getMessage

String getMessage(List<SVGElementModel> sourceElements)

Returns the text which appears in the ghost during a drag and drop operation

Parameters:

sourceElements - The elements being dragged

Returns:

getKeyCode

int getKeyCode()

Returns the key code associated with this handler

Returns: