BeforeZoomChange Event (GdViewer)

In This Topic

This event is raised before the zoom level is going to change.

Please check the corresponded GdViewer.BeforeZoomChangeEventHandler for more details.

Syntax

Visual Basic
C#
Delphi
JScript
Managed Extensions for C++
C++/CLI

'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.

VB.NET
C#

'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.
}

Reference

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