ControlFontZooming Event

Occurs before C1Zoom start zoom the target control's font.

Namespace: C1.Win.TouchToolKit

Assembly: C1.Win.TouchToolKit.10.dll

Syntax

public event EventHandler<ControlFontZoomingEventArgs> ControlFontZooming

Public Event ControlFontZooming As EventHandler(Of ControlFontZoomingEventArgs)

Returns

Type	Description
EventHandler<ControlFontZoomingEventArgs>	Occurs before start zoom the target control's font.

Remarks

You can set Handled to avoid default logic of C1Zoom for current control.

You can set ChildrenHandled to avoid default logic of C1Zoom for current control's child control.

Examples

The following code example shows how to use this event.

This code example is part of a larger example provided for the ZoomFactorChanged event.

public class GcZoomEventDemo : Form
{
	private GcZoom _gcZoom1 = new GcZoom();

	public GcZoomEventDemo()
	{
		_gcZoom1.Target = this;
		_gcZoom1.AutoShowControl = true;
		_gcZoom1.ControlFontZooming += _gcZoom1_ControlFontZooming;
	}

	void _gcZoom1_ControlFontZooming(object sender, ControlFontZoomingEventArgs e)
	{
		ZoomFontInfo info = e.ZoomFontInfo;

		Console.WriteLine(e.TargetControl.ToString());
		Console.WriteLine(info.CurrentFontSize.ToString());

		// For complex control, user may want to change the control's inner element's font.
		// User can use ControlFontZooming to support complex control.
		if (e.TargetControl is TextBox)
		{
			e.TargetControl.Font = new Font(e.TargetControl.Font.FontFamily, e.ZoomFontInfo.CurrentFontSize);

			// If set to true, default zoom logic for this control will be canceled.
			e.Handled = true;
		}

		// If target control has children controls and wan't to use default zoom logic for children 
		// controls, set e.ChildrenHandled property to true.
		// e.ChildrenHandled = true; 
	}
}

Public Class GcZoomEventDemo
	Inherits Form
	Private _gcZoom1 As New GcZoom()

	Public Sub New()
		_gcZoom1.Target = Me
		_gcZoom1.AutoShowControl = True
		AddHandler _gcZoom1.ControlFontZooming, AddressOf _gcZoom1_ControlFontZooming
	End Sub

	Private Sub _gcZoom1_ControlFontZooming(sender As Object, e As ControlFontZoomingEventArgs)
		Dim info As ZoomFontInfo = e.ZoomFontInfo

		Console.WriteLine(e.TargetControl.ToString())
		Console.WriteLine(info.CurrentFontSize.ToString())

		' For complex control, user may want to change the control's inner element's font.
		' User can use ControlFontZooming to support complex control.
		If TypeOf e.TargetControl Is TextBox Then
			e.TargetControl.Font = New Font(e.TargetControl.Font.FontFamily, e.ZoomFontInfo.CurrentFontSize)

			' If set to true, default zoom logic for this control will be canceled.
			e.Handled = True
		End If

		' If target control has children controls and wan't to use default zoom logic for children 
		' controls, set e.ChildrenHandled property to true.
		' e.ChildrenHandled = true; 
	End Sub
End Class