GdPicture.NET Reference Guide
BeforeZoomChange Event (GdViewer)
Example 





GdPicture14 Namespace > GdViewer Class : BeforeZoomChange Event
This event is raised before the zoom level is going to change.

Please check the corresponded GdViewer.BeforeZoomChangeEventHandler for more details.

Syntax
'Declaration
 
Public Event BeforeZoomChange As GdViewer.BeforeZoomChangeEventHandler
public event GdViewer.BeforeZoomChangeEventHandler BeforeZoomChange
public event BeforeZoomChange: GdViewer.BeforeZoomChangeEventHandler; 
In JScript, you can handle the events defined by another class, but you cannot define your own.
public: __event GdViewer.BeforeZoomChangeEventHandler* BeforeZoomChange
public:
event GdViewer.BeforeZoomChangeEventHandler^ BeforeZoomChange
Remarks
Just to inform you that this event always occurs when the viewer control is going to refresh due to any changing of the zoom level or the zoom mode.
Example
How to add this event to your GdViewer control.
'We assume that the GdViewer1 control has been properly integrated.
Friend WithEvents GdViewer1 As GdPicture14.GdViewer
            
'Add the event.
AddHandler GdViewer1.BeforeZoomChange, AddressOf GdViewer1_BeforeZoomChange
            
'Define the event.
Sub GdViewer1_BeforeZoomChange() Handles GdViewer1.BeforeZoomChange
    'Do your stuff here.
End Sub
//We assume that the GdViewer1 control has been properly integrated.
            
//Add the event.
GdViewer1.BeforeZoomChange += GdViewer1_BeforeZoomChange;
            
//Define the event.
void GdViewer1_BeforeZoomChange()
{
    //Do your stuff here.
}
See Also

Reference

GdViewer Class
GdViewer Members
GdViewer.BeforeZoomChangeEventHandler Delegate
AfterZoomChange Event
Zoom Property
ZoomMode Property
SetZoom100 Method