MATLAB SIMULINK 7 - GRAPHICAL USER INTERFACE Uživatelský manuál stáhnout pdf (Strana 264)

9 Examples of GUIDE UIs

9-18

When the you resize the window and release the mouse, the SizeChangedFcn callback

executes. Unless you have maximized the figure, the SizeChangedFcn callback enforces

the height of the window and resets the width of the Contact Name field. The following

sections describe how this calculation works.

Width Changes

If the new width is greater than the original width, set the figure to the new width.

The size of the Contact Name text box changes in proportion to the new figure width.

This is accomplished by:

• Obtaining the figure width as a ratio of its original width.

• Expanding or contracting the width of the Contact Name field proportionally.

If the new width is less than the original width, use the original width. The code relies on

the fact that the original width of the Contact Name field is 72 character units.

Height Changes

The height and width of the UI window is specified in pixel units. Using units of pixels

enables maximizing and minimizing the figure to work properly. The code assumes

that its dimensions are 470-by-250 pixels. If you attempt to change the height, the code

restores the original height. However, because the resize function is triggered when

you release the mouse button after changing the size, the resize function cannot

always determine the original position of the window on the screen. Therefore, the resize

function applies a compensation to the vertical position (second element in the figure

Position vector) by adding the vertical position to the height when you release the

mouse and subtracting the original height.

When you resize the UI window from the bottom, the window stays in the same position.

When you resize from the top, the window moves to the location where you release the

mouse button.

SizeChangedFcn

% uicontrol units are in 'characters'

Figure_Size = get(hObject,'Position');

% This is the figure's original position in pixel units

Original_Size = [350 700 470 250];

% If the figure seems to be maximized, do not resize at all

pix_pos = get(hObject,'Position');

scr_size = get(groot,'ScreenSize');

if .99*scr_size(3) < pix_pos(3) % Apparently maximized

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MATLAB SIMULINK 7 - GRAPHICAL USER INTERFACE Uživatelský manuál Strana 264