Class RelinkingTool

You do not normally need to create an instance of this tool because one already exists as the ToolManager.relinkingTool, which you can modify.

The Tool.name of this tool is "Relinking".

Gets or sets a small GraphObject that is copied as a relinking handle for the selected link path at the "from" end of the link. By default this is a Shape that is a small blue diamond. Setting this property does not raise any events.

Here is an example of changing the default handle to be larger green triangles:

 myDiagram.toolManager.relinkingTool.fromHandleArchetype =
   new go.Shape('Triangle',
     { width: 10, height: 10, fill: 'limegreen', segmentIndex: 0, cursor: 'pointer' });
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Returns the GraphObject that is the tool handle being dragged by the user. This will be contained by an Adornment whose category is "RelinkFrom" or "RelinkTo". Its Adornment.adornedPart is the same as the originalLink.

This property is also settable, but should only be set either within an override of doActivate or prior to calling doActivate.

Gets or sets a small GraphObject that is copied as a relinking handle for the selected link path at the "to" end of the link. By default this is a Shape that is a small blue diamond. Setting this property does not raise any events.

Here is an example of changing the default handle to be larger orange triangles:

 myDiagram.toolManager.relinkingTool.toHandleArchetype =
   new go.Shape('Triangle',
     { width: 10, height: 10, fill: 'orange', segmentIndex: -1, cursor: 'pointer' });
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This tool can run when the diagram allows relinking, the model is modifiable, and there is a relink handle at the mouse-down point.

This method may be overridden, but we recommend that you call this base method.

Start the relinking operation.

Find the relink handle by calling Tool.findToolHandleAt looking for either the "RelinkFrom" adornment or the "RelinkTo" adornment, saving the result in handle.

Normally when this method is called the value of LinkingBaseTool.originalLink and handle will be null, resulting in a call to Tool.findToolHandleAt to find a "RelinkFrom" or "RelinkTo" tool handle, which is then remembered as the value of handle. If when this method is called the value of handle is already set, then there is no need to call Tool.findToolHandleAt, because the programmer has already set up which relinking handle they want the user to be relinking. Finding a handle is not necessary if LinkingBaseTool.originalLink and isForwards have been set before calling this method.

This starts a transaction, captures the mouse, and sets the cursor.

If LinkingBaseTool.originalLink or handle was not set beforehand, the value of isForwards is set depending on the category of the relink handle found. The LinkingBaseTool.originalLink property and various "Original..." port and node properties are set too. The temporary nodes and temporary link are also initialized.

This method may be overridden, but we recommend that you call this base method.

Finishing the linking operation stops the transaction, releases the mouse, and resets the cursor.

This method may be overridden, but we recommend that you call this base method.

A mouse-up ends the relinking operation; if there is a valid targetPort nearby, this modifies the old link to connect with the target port.

A successful relinking calls reconnectLink to actually change the link. The "LinkRelinked" DiagramEvent is raised with the link as the DiagramEvent.subject and with the now-disconnected original port as the DiagramEvent.parameter. If the link was not reconnected, this calls doNoRelink. In any case this stops the tool.

A failure to find a valid target port results in no changes and no DiagramEvent.

This method may be overridden, but we recommend that you call this base method. You might find it easier to override reconnectLink. It is actually most common to implement a "LinkRelinked" DiagramEvent listener on the Diagram.

This method is called upon a mouse up when reconnectLink is not called.

This method may be overridden. By default this method does nothing. If you want to successfully perform any side-effects, you will need to set Tool.transactionResult to a string; otherwise this tool's transaction will be rolled-back. Please read the Introduction page on Extensions for how to override methods and how to call this base method.

Modify an existing Link to connect to a new node and port.

This method may be overridden, but we recommend that you call this base method. Please read the Introduction page on Extensions for how to override methods and how to call this base method.

Show an Adornment for each end of the Link that the user may reconnect. The Adornment may have a copy of fromHandleArchetype and/or toHandleArchetype.

This method may be overridden.