TEJ 3M
Buttons
Name:
Syntax to Create a Button:
GUI.CreateButton (x, y, width, text, actionProc)
x, y - the x and y parameters specify the lower-left corner of the button
width - width of the button
text - the text that will appear on the button
actionProc - is the name of the procedure that is run when the button is pressed
GUI.CreateButtonFull (x, y, width, text, actionProc, height, shortcut, default)
x, y - the x and y parameters specify the lower-left corner of the button
width - width of the button
text - the text that will appear on the button
actionProc - is the name of the procedure that is run when the button is pressed
height - less than the size necessary to display the button, the button is automatically enlarged
to fit the text
shortcut - the keystroke to be used as the button's shortcut
default - is a boolean indicating whether the button should be the default button (The two
possible Boolean values are true and false)
Example 1: Creating a Button
%The following program creates two buttons, one which draws a random circle on the screen and one
which quits %the program.
import GUI
procedure DrawRandomCircle
var r : int := Rand.Int (20, 50)
var x : int := Rand.Int (r, maxx)
var y : int := Rand.Int (r, maxy)
var c : int := Rand.Int (0, maxcolor)
Draw.FillOval (x, y, r, r, c)
% In case we drew over the buttons, redraw them.
GUI.Refresh
end DrawRandomCircle
View.Set ("graphics:300;200,nobuttonbar ")
var draw : int := GUI.CreateButtonFull (50, 10, 0, "Draw Circle", DrawRandomCircle, 0, '^D', true)
var quitBtn : int := GUI.CreateButton (200, 10, 0, "Quit", GUI.Quit)
loop
exit when GUI.ProcessEvent
end loop
Check Boxes:
Syntax to Create a Check Boxes:
GUI.CreateCheckBox (x, y, text, actionProc:procedure x (filled : boolean))
x, y - the x and y parameters specify the lower-left corner of the button
width - width of the button
text - the text that will appear on the button
actionProc - is the name of the procedure that is run when the button is pressed
GUI.CreateCheckBoxFull (x, y, text, actionProc:procedure x (filled : boolean), alignment, shortcut)
x, y - the x and y parameters specify the lower-left corner of the button
text - the text that will appear on the button
actionProc - is the name of the procedure that is run when the button is pressed
alignment - specifies the position of the check box in relation to the text as well as the meaning
of the x and y parameters
shortcut - the keystroke to be used as the button's shortcut
%The following program creates two buttons, one which draws a random circle on the screen and one
which quits % the program
import GUI
procedure DoNothing (status : boolean) %as title this procedure does nothing
end DoNothing
View.Set ("graphics:300;100,nobuttonbar")
var cb1, cb2, quitBtn : int
cb1 := GUI.CreateCheckBox (10, 10, "Check Box 1", DoNothing)
cb2 := GUI.CreateCheckBoxFull (200, 10, "Check Box 2", DoNothing, GUI.RIGHT, '2')
%2 at end is shortcut key
GUI.SetCheckBox (cb2, true) %sets the button called cb2 to be checked off to start
quitBtn := GUI.CreateButton (230, 10, 0, "Quit", GUI.Quit) %creates a quit button labled 'Quit'
loop
exit when GUI.ProcessEvent
end loop
var cb1Status, cb2Status : Boolean
cb1Status := GUI.GetCheckBox (cb1)
cb2Status := GUI.GetCheckBox (cb2)
if cb1Status then
put "Check box 1: filled"
else
put "Check box 1: empty"
end if
if cb2Status then
put "Check box 2: filled"
else
put "Check box 2: empty"
end if
Radio Buttons:
Syntax to Create a Radio Button:
GUI.CreateRadioButton (x, y, text, joinID, actionProc)
x, y - the x and y parameters specify the lower-left corner of the button
text - the text that will appear on the button
joinID - specifies the group the radio button belongs to
actionProc - is the name of the procedure that is run when the button is pressed
GUI.CreateRadioButtonFull (x, y, text, joinID, actionProc, alignment, shortCut)
x, y - the x and y parameters specify the lower-left corner of the button
text - the text that will appear on the button
joinID - specifies the group the radio button belongs to
actionProc - is the name of the procedure that is run when the button is pressed
alignment - specifies the position of the radio button in relation to the text as well as the
meaning of the x and y parameters
shortcut - the keystroke to be used as the button's shortcut
Alignment Parameter Options:
The alignment parameter is one of 0, GUI.LEFT, or GUI.RIGHT.
An alignment of 0 is the default and is the same as GUI.LEFT. GUI.LEFT means the actual box in the check
box appears to the left of the check box's label and (x, y) specify the lower-left corner.
An alignment of GUI.RIGHT means that the actual box appears to the right of the radio button's label
and (x, y) specify the lower-right corner of the radio button.
Example Create Radio Button
%The following program creates six radio buttons in two groups.
import GUI
View.Set ("graphics:350;80")
var radio : array 1 .. 6 of int % The radio button IDs.
procedure RadioPressed
Text.Locate (1, 1)
put "Radio Button " ..
for i : 1 .. 6
if radio (i) = GUI.GetEventWidgetID then
put i ..
end if
end for
put " Selected"
end RadioPressed
radio (1) := GUI.CreateRadioButton (1, 35, "Radio Button 1", 0, RadioPressed)
radio (2) := GUI.CreateRadioButton ( 1, 20, "Radio Button 2", radio (1), RadioPressed)
radio (3) := GUI.CreateRadioButton ( 1, 5, "Radio Button 3",radio (2), RadioPressed)
radio (4) := GUI.CreateRadioButtonFull (maxx - 15, 35, "Radio Button A (Shortcut: 'a')", 0,
RadioPressed, GUI.RIGHT, 'a')
radio (5) := GUI.CreateRadioButtonFull (maxx - 15, 20, "Radio Button B (Shortcut: 'b')", radio (4),
RadioPressed, GUI.RIGHT, 'b')
radio (6) := GUI.CreateRadioButtonFull (maxx - 15, 5, "Radio Button C (Shortcut: 'c')", radio (5),
RadioPressed, GUI.RIGHT, 'c')
loop
exit when GUI.ProcessEvent
end loop