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 End-User Documentation

VGridControlBase.CustomDrawTreeButton Event

Enables expand buttons to be painted manually.

Namespace:DevExpress.XtraVerticalGrid
Assembly:DevExpress.XtraVerticalGrid.v18.2.dll

Expanded Syntax

Expanded Event Data

The event handler receives an argument of type CustomDrawTreeButtonEventArgs containing data related to this event.

The following CustomDrawTreeButtonEventArgs properties provide information specific to this event.
Property Description
Appearance Gets the painted element's appearance settings.
Bounds Gets a value specifying limits for the drawing area.
Cache Gets an object which specifies the storage for the most used pens, fonts and brushes.
Expanded Gets a value indicating whether the painted button's corresponding row is expanded.
Graphics Gets an object used to paint.
Handled Gets or sets a value specifying whether an event was handled, if handled, default actions are not required.
IsRightToLeft Gets a value indicating whether the VGridControl's elements are aligned to support locales using right-to-left fonts.
ObjectArgs Gets an object containing information about the painted element.
Painter Gets the painter object that provides the default element's painting mechanism.
Properties Provides properties specific to the row being custom painted.
Row Gets the row whose element is to be drawn.
TreeButtonType Gets the painted button's type.

Expanded Remarks

The CustomDrawTreeButton event is raised before an expand button is painted. The button's row is identified by the CustomDrawRowEventArgs.Row parameter. The CustomDrawTreeButtonEventArgs.Expanded property allows you to determine whether the processed expand button corresponds to the expanded or collapsed state of a row. The button's type is identified by the CustomDrawTreeButtonEventArgs.TreeButtonType property.

The CustomDrawTreeButton event can be used for two purposes:

  • To manually paint all or only particular expand buttons. Note that you need to set the CustomDrawEventArgs.Handled parameter to true to indicate that the default painting is not required for the button.
  • Change the button's appearance settings and leave the CustomDrawEventArgs.Handled parameter set to false. This will paint buttons using the default mechanism but with modified settings.
Note

The control's events designed to change the appearance or rendering of control elements must not be used to update cell values or to modify the control's layout. Any inappropriate operation which causes a layout update, may break the normal control behavior.

Expanded Example

The following sample code shows how to use the CustomDrawTreeButton event to paint tree buttons. Custom painting is not applied to category expand buttons, these buttons are painted in their default manner. The result is shown in the image below:

Expanded See Also

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