Property-Changed Events


The Form class provides several events that fire when certain form properties change. The name of each of these events has the form PropertyNameChanged where PropertyName is the name of the corresponding property. For example, the BackColorChanged event fires when the form’s BackColor property changes.

The following is a list of these events.

 BackColorChanged                MaximumSizeChanged BackgroundImageChanged          MinimumSizeChanged ContextMenuChanged              ParentChanged CursorChanged                   SizeChanged DockChanged                     StyleChanged EnabledChanged                  SystemColorsChanged FontChanged                     TextChanged ForeColorChanged                VisibleChanged LocationChanged

The names of most of these controls are self-explanatory, so they are not described further here. The exception is the SystemColorsChanged event. This occurs when the system’s colors are changed either by the user or programmatically.

For example, suppose that you want the form to draw using its ForeColor property and you want that property to match the active title bar text color. Then, you could use the following code to update ForeColor when the user changed the system colors:

 Private Sub Form2_SystemColorsChanged(ByVal sender As Object, _  ByVal e As System.EventArgs) Handles MyBase.SystemColorsChanged     Me.ForeColor = SystemColors.ActiveCaptionText End Sub

Note that Visual Basic invalidates the form after raising the SystemColorsChanged event, so the form immediately repaints itself using the new settings.




Visual Basic 2005 with  .NET 3.0 Programmer's Reference
Visual Basic 2005 with .NET 3.0 Programmer's Reference
ISBN: 470137053
EAN: N/A
Year: 2007
Pages: 417

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