C# Class UMD.HCIL.Piccolo.Event.PZoomEventHandler

ZoomEventhandler provides event handlers for basic zooming of the canvas view with the right (third) button.

Tthe initial mouse press defines the zoom anchor point, and then moving the mouse to the right zooms with a speed proportional to the amount the mouse is moved to the right of the anchor point. Similarly, if the mouse is moved to the left, the the view is zoomed out.

Inheritance: PDragSequenceEventHandler

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Public Methods

Method	Description
PZoomEventHandler ( ) : System	Constructs a new PZoomEventHandler.

Protected Methods

Method	Description
OnDragActivityFirstStep ( object sender, PInputEventArgs e ) : void	Overridden. See PDragSequenceEventHandler.OnDragActivityFirstStep.
OnDragActivityStep ( object sender, PInputEventArgs e ) : void	Overridden. See PDragSequenceEventHandler.OnDragActivityStep.
PZoomEventHandlerAcceptsEvent ( PInputEventArgs e ) : bool	The filter for a PZoomEventHandler. This method only accepts right mouse button events that have not yet been handled.

Method Details

OnDragActivityFirstStep() protected method

Overridden. See PDragSequenceEventHandler.OnDragActivityFirstStep.

protected OnDragActivityFirstStep ( object sender, PInputEventArgs e ) : void
sender	object
e	PInputEventArgs
return	void

OnDragActivityStep() protected method

Overridden. See PDragSequenceEventHandler.OnDragActivityStep.

protected OnDragActivityStep ( object sender, PInputEventArgs e ) : void
sender	object
e	PInputEventArgs
return	void

PZoomEventHandler() public method

Constructs a new PZoomEventHandler.

public PZoomEventHandler ( ) : System
return	System

PZoomEventHandlerAcceptsEvent() protected method

The filter for a PZoomEventHandler. This method only accepts right mouse button events that have not yet been handled.

protected PZoomEventHandlerAcceptsEvent ( PInputEventArgs e ) : bool
e	PInputEventArgs	A PInputEventArgs that contains the event data.
return	bool