preferredSize

preferredSize sets the size the form element must have at runtime.

preferredSize is one of the main properties for all containers and widgets.

Form XML code:

Theme property filter XML code:

Possible values:

integer number of any css units

Associated containers, widgets and theme elements:

rootContainer BorderPanel CoordPanel GridPanel GroupBox ScrollViewer StackPanel Tab Table TreeTable

BlobViewer Browser Button Calendar Canvas CheckBox ComboBox FunctionField Label ListBox

PlaceHolder ProgressBar RadioGroup Slider Spinner TextArea TextField TimeEditField WebComponent

Associated ui methods:

setPreferredSize()

getPreferredSize()

Influence and behavior:

preferredSize is used to set the size of the form element - container or widget - exactly.

If the preferredSize is set, this form elements will have this size even if its parent or ascendant element is resized.

 

preferredSize is a compound property: It consists of two sub-properties - Width and Height both is LFD and LTD:

You set either both width and height (recommended) or one of them.

If you set only width or only height, the second dimension is calculated based on the default dimensions for form elements, Lycia system theme and system css, or browser settings and requirements.

 

preferredSize can be set in all css units like px, pt, em, qch, etc.:

If you set preferredSize but do not specify its units, the size will be in pixels.

 

If you set preferredSize to very large values (more than 1,313x50,139 px), LyciaStudio will not be able to draw this form because of the lack of memory.

In this case, you will get the warning:

When you set preferredSize for any other element - not a root container, - you will not get this warning because LyciaStudio will draw only that part of your element that fits the size of the root container and will not get the memory stack overflow.

 

You can set the size of a form element at runtime via the corresponding ui method - SetPreferredSize():

CALL grd.SetPreferredSize(["250px", "250px"])

The getter - getPreferredSize() - returns the size set for the element in the .fm2 form, .qxtheme theme, or by setPreferredSize().

SetPreferredSize() takes two parameters - for width and for height - that can be specified as an array or as a record (see the example program, preferredsize_ui):

or