MATLAB SIMULINK 7 - GRAPHICAL USER INTERFACE Uživatelský manuál stáhnout pdf (Strana 324)

12 Examples of GUIs Created Programmatically

12-46

iconEditor calls prepareLayout with the handle of the main figure, in the

initialization section of the M-file.

prepareLayout(hMainFigure);

First, prepareLayout uses findall to retrieve the handles of all objects

contained in the figure. The list of retrieved handles includes the

colorPalette, which is embedded in the iconEditor, and its children. The

figure’s handle is passed to

findall as the input argument topContainer.

function prepareLayout(topContainer)

...

allObjects = findall(topContainer);

Then, prepareLayout uses strcmpi to determine if the GUI is resizable.

Depending on the outcome, it sets the

Units properties of all the objects to

either

Normalized or Characters.

if strcmpi(get(topContainer, 'Resize'),'on')

set(allObjects(isprop(allObjects,'Units')),...

'Units','Normalized');

else

set(allObjects(isprop(allObjects,'Units')),...

'Units','Characters');

end

Note The iconEditor is resizable because it accepts the default value, on, of

the figure Resize property.

Resizable Figure. Normalized units map the lower-left corner of the figure and of

each component to (0,0) and the upper-right corner to (1.0,1.0). Because of this,

when the GUI is resized, component size is automatically changed relative its

parent’s size.

Nonresizable Figure. Character units automatically adjusts the size and relative

spacing of components as the GUI displays on different computers.

Character units are defined by characters from the default system font. The

width of a character unit equals the width of the letter

x in the system font. The

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MATLAB SIMULINK 7 - GRAPHICAL USER INTERFACE Uživatelský manuál Strana 324