TControl.CalculatePreferredSize

CalculatePreferredSize - find default/preferred height and width

Declaration

Source position: controls.pp line 1045

Description

CalculatePreferredSize - find default/preferred height and width

procedure TControl.CalculatePreferredSize

(var PreferredWidth, PreferredHeight: integer; WithThemeSpace: Boolean);

Calculates the default/preferred width and height for a control, which is used by the LCL autosizing algorithms as default size. Only positive values are valid. Negative or 0 are treated as undefined and the LCL uses other sizes instead.

TWinControl overrides this and asks the interface for theme dependent values. See TWinControl.CalculatePreferredSize for more information.

WithThemeSpace: If true, adds space for stacking.

For example: TRadioButton has a minimum size. But for stacking multiple TRadioButtons there should be some space around. This space is theme dependent, so the parameter is passed to the widgetset.