Unit 'Controls' Package
[Overview][Constants][Types][Classes][Procedures and functions][Variables][Index] [#lcl]

TControl.InvalidateControl

Requests a repaint of the control.

Declaration

Source position: controls.pp line 1441

protected procedure TControl.InvalidateControl(

  CtrlIsVisible: Boolean;

  CtrlIsOpaque: Boolean

);

procedure TControl.InvalidateControl(

  CtrlIsVisible: Boolean;

  CtrlIsOpaque: Boolean;

  IgnoreWinControls: Boolean

);

Arguments

CtrlIsVisible

  

True if the control is visible.

CtrlIsOpaque

  

True if the control use an opaque drawing style.

Arguments

CtrlIsVisible

  

True if the control is visible.

CtrlIsOpaque

  

True if the control use an opaque drawing style.

IgnoreWinControls

  

True if TWinControl descendants are ignored in the method.

Description

InvalidateControl is an overloaded method used to redraw the bounds rectangle for control. No actions are performed in the method if the Parent control or its Handle are not assigned, during LCL component streaming, or when the control is being freed.

When CtrlIsVisible is set to True or the control has a visible design surface, the InvalidateRect routine is called. The BoundsRect for the control is erased and redrawn when the control uses an opaque drawing style, or when it occludes a sibling control in its Parent.

InvalidateControl is called from methods like Invalidate and ChangeBounds, and when a new value is assigned to the Visible property.

See also

TControl.Invalidate

  

Causes a delayed Repaint of the control by marking its visible area of the control as invalid.

TControl.ChangeBounds

  

Sets the bounds (left, top, height, width) and optionally the BaseBounds of the control.

TControl.Visible

  

Allows the control, and all of its children, to be displayed or hidden.

TControl.VisibleChanged

  

Notifies all OnVisibleChanged handlers.

TControl.CMVisibleChanged

  

Message handler for changed visibility.



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