ImageEn, unit iexToolbars




property OnActionUpdate: TIEActionEvent;


Occurs when the state of the button action is updated (i.e. needs to be set visible or enabled). The default behaviour can be overriden by setting Handled to true.
It also handles the state for custom buttons.

Parameter Description
Sender The action or control being updated. See details below
ButtonImageID The ID of the affected control
Handled When False the default state behaviour occurs. Set to true to apply your own state setting code

The Sender type will be one of the following:
 TToolButton for custom buttons
 TComboBox showing a shape (IELayerShapeBox_Button_ID)
 TPaintBox for colors, fonts, sizes, etc. (IELayerFontColorSelect_Button_ID, IELayerFontBox_Button_ID, IELayerFillBox_Button_ID, IELayerBorderSizeBox_Button_ID, IELayerBorderColorBox_Button_ID, IEViewToolBrushSizeBox_Button_ID, IEViewToolColor_Button_ID, IEViewZoomBox_Button_ID, IERichEditFontColor_Button_ID, IERichEditFontBox_Button_ID)
 TAction from the ImageEn Actions Classes (all other types)

 This method is called frequently, so avoid slow code
 You can alternatively use the global event, OnToolbarButtonUpdate


procedure TMainForm.ImageEnViewToolbar1ActionUpdate(Sender: TObject; ButtonID: Integer; var Handled: Boolean);
  // Disable opening once we have a valid image
  if Sender is TImageEnViewPromptToOpen then
    TImageEnViewPromptToOpen(Sender).Enabled := ImageEnView1.IsEmpty(False);
    Handled := True;

See Also

 TImageEnView Actions
 TImageEnView Layer Actions
 TIERichEdit Actions