The document discusses using various Qt GUI classes like QTextEdit, QListWidget, QTreeView, QTreeWidget, QComboBox, and QMenuBar in Ring programming examples. Code snippets are provided to demonstrate how to load the GUI library, create widgets, add items and actions, and display the application at runtime for each class.

1. Ring Documentation, Release 1.6
57.3 Using the QTextEdit Class
In this example we will use the QTextEdit Class
Load "guilib.ring"
New qApp {
win1 = new qWidget() {
setwindowtitle("QTextEdit Class")
setGeometry(100,100,500,500)
new qtextedit(win1) {
setGeometry(10,10,480,480)
}
show()
}
exec()
}
During the runtime we can paste rich text in the qtextedit widget
57.3. Using the QTextEdit Class 593

2. Ring Documentation, Release 1.6
57.4 Using the QListWidget Class
In this example we will use the QListWidget Class
Load "guilib.ring"
New qApp {
win1 = new qWidget() {
setGeometry(100,100,400,400)
list1 = new qlistwidget(win1) {
setGeometry(150,100,200,200)
alist = ["one","two","three","four","five"]
for x in alist additem(x) next
setcurrentrow(3,2)
win1.setwindowtitle("Items Count : " + count() )
}
57.4. Using the QListWidget Class 594

3. Ring Documentation, Release 1.6
btn1 = new qpushbutton(win1) {
setGeometry(10,200,100,30)
settext("selected item")
setclickevent("pWork()")
}
btn2 = new qpushbutton(win1) {
setGeometry(10,240,100,30)
settext("Delete item")
setclickevent("pWork2()")
}
show()
}
exec()
}
func pWork
btn1.settext(string(list1.currentrow()))
func pWork2
list1 {
takeitem(currentrow())
}
The application during the runtime
57.4. Using the QListWidget Class 595

4. Ring Documentation, Release 1.6
Another Example:
Load "guilib.ring"
New qApp {
win1 = new qWidget() {
setGeometry(100,100,500,400)
list1 = new qlistwidget(win1) {
setGeometry(150,100,200,200)
alist = ["one","two","three","four","five"]
for x in alist additem(x) next
setcurrentrow(3,2)
win1.setwindowtitle("Items Count : " + count() )
}
btn1 = new qpushbutton(win1) {
setGeometry(10,200,100,30)
settext("selected item")
setclickevent("pWork()")
}
btn2 = new qpushbutton(win1) {
setGeometry(10,240,100,30)
settext("Delete item")
setclickevent("pWork2()")
}
show()
}
exec()
}
func pWork
nbrOfItems = list1.count()
curItemNbr = list1.currentrow()
curValue = list1.item(list1.currentrow()).text()
win1.setwindowtitle( "After Select - NbrOfItems: " + nbrOfItems +
" CurItemNbr: " + curItemNbr + " CurValue: " + curValue )
btn1.settext( string(list1.currentrow() ) + " --- " +
list1.item(list1.currentrow()).text() )
func pWork2
list1 {
takeitem(currentrow())
nbrOfItems = count()
curItemNbr = currentrow()
curValue = item(currentrow()).text()
57.4. Using the QListWidget Class 596

5. Ring Documentation, Release 1.6
win1.setwindowtitle("After Delete - NbrOfItems: " + nbrOfItems +
" CurItemNbr: " + curItemNbr +" CurValue: " + curValue )
}
57.5 Using QTreeView and QFileSystemModel
In this example we will learn how to use the QTreeView widget to represent the File System
Load "guilib.ring"
New qApp {
win1 = New qWidget() {
setwindowtitle("Using QTreeView and QFileSystemModel")
setGeometry(100,100,500,400)
New qtreeview(win1) {
setGeometry(00,00,500,400)
oDir = new QDir()
ofile = new QFileSystemModel()
ofile.setrootpath(oDir.currentpath())
setmodel(ofile)
}
show()
}
exec()
}
The application during the runtime
57.5. Using QTreeView and QFileSystemModel 597

6. Ring Documentation, Release 1.6
57.6 Using QTreeWidget and QTreeWidgetItem
In this example we will learn about using the QTreeWidget and QTreeWidgetItem classes
Load "guilib.ring"
New qApp {
win1 = new qWidget() {
setwindowtitle("TreeWidget")
setGeometry(100,100,400,400)
layout1 = new qvboxlayout()
tree1 = new qtreewidget(win1) {
setGeometry(00,00,400,400)
setcolumncount(1)
myitem = new qtreewidgetitem()
myitem.settext(0,"The First Step")
addtoplevelitem(myitem)
for x = 1 to 10
myitem2 = new qtreewidgetitem()
myitem2.settext(0,"hello"+x)
myitem.addchild(myitem2)
57.6. Using QTreeWidget and QTreeWidgetItem 598

7. Ring Documentation, Release 1.6
for y = 1 to 10
myitem3 = new qtreewidgetitem()
myitem3.settext(0,"hello"+x)
myitem2.addchild(myitem3)
next
next
setheaderlabel("Steps Tree")
}
layout1.addwidget(tree1)
setlayout(layout1)
show()
}
exec()
}
The application during the runtime
57.7 Using QComboBox Class
In this example we will learn about using the QComboBox class
57.7. Using QComboBox Class 599

8. Ring Documentation, Release 1.6
Load "guilib.ring"
New qApp {
win1 = new qWidget() {
setwindowtitle("Using QComboBox")
setGeometry(100,100,400,400)
New QComboBox(win1) {
setGeometry(150,100,200,30)
alist = ["one","two","three","four","five"]
for x in aList additem(x,0) next
}
show()
}
exec()
}
The application during the runtime
57.8 Creating Menubar
In this example we will learn about using the QMenuBar class
57.8. Creating Menubar 600

9. Ring Documentation, Release 1.6
Load "guilib.ring"
MyApp = New qApp {
win1 = new qWidget() {
setwindowtitle("Using QMenubar")
setGeometry(100,100,400,400)
menu1 = new qmenubar(win1) {
sub1 = addmenu("File")
sub2 = addmenu("Edit")
sub3 = addmenu("Help")
sub1 {
oAction = new qAction(win1) {
settext("New")
}
addaction(oAction)
oAction = new qAction(win1) {
settext("Open")
}
addaction(oAction)
oAction = new qAction(win1) {
settext("Save")
}
addaction(oAction)
oAction = new qAction(win1) {
settext("Save As")
}
addaction(oAction)
addseparator()
oAction = new qaction(win1) {
settext("Exit")
setclickevent("myapp.quit()")
}
addaction(oAction)
}
sub2 {
oAction = new qAction(win1) {
settext("Cut")
}
addaction(oAction)
oAction = new qAction(win1) {
settext("Copy")
}
addaction(oAction)
oAction = new qAction(win1) {
settext("Paste")
}
addaction(oAction)
addseparator()
oAction = new qAction(win1) {
settext("Select All")
}
addaction(oAction)
}
sub3 {
oAction = new qAction(win1) {
57.8. Creating Menubar 601

10. Ring Documentation, Release 1.6
settext("Reference")
}
addaction(oAction)
sub4 = addmenu("Sub Menu")
sub4 {
oAction = new qAction(win1) {
settext("Website")
}
addaction(oAction)
oAction = new qAction(win1) {
settext("Forum")
}
addaction(oAction)
oAction = new qAction(win1) {
settext("Blog")
}
addaction(oAction)
}
addseparator()
oAction = new qAction(win1) {
settext("About")
}
addaction(oAction)
}
}
show()
}
exec()
}
The application during the runtime
57.8. Creating Menubar 602