The Ring programming language version 1.3 book - Part 48 of 88

1. Ring Documentation, Release 1.3
exec()
}
Func pOpen
new qfiledialog(win1) {
cName = getopenfilename(win1,"open file","c:","source files(*.ring)")
win1.setwindowtitle(cName)
}
The application during the runtime
49.33 Drawing using QPainter
In this example we will learn about drawing using the QPainter class
Load "guilib.ring"
New qapp {
win1 = new qwidget() {
setwindowtitle("Drawing using QPainter")
setgeometry(100,100,500,500)
label1 = new qlabel(win1) {
setgeometry(10,10,400,400)
settext("")
}
new qpushbutton(win1) {
setgeometry(200,400,100,30)
settext("draw")
setclickevent("draw()")
}
show()
}
49.33. Drawing using QPainter 448

2. Ring Documentation, Release 1.3
exec()
}
Func draw
p1 = new qpicture()
color = new qcolor() {
setrgb(0,0,255,255)
}
pen = new qpen() {
setcolor(color)
setwidth(10)
}
new qpainter() {
begin(p1)
setpen(pen)
drawline(500,150,950,450)
drawline(950,550,500,150)
endpaint()
}
label1 { setpicture(p1) show() }
The application during the runtime
49.33. Drawing using QPainter 449

3. Ring Documentation, Release 1.3
49.34 Printing using QPrinter
In this example we will learn how to print to PDF file using QPrinter
Load "guilib.ring"
new qApp {
win1 = new qwidget() {
setwindowtitle("Printer")
setgeometry(100,100,500,500)
myweb = new qwebview(win1) {
setgeometry(100,100,1000,500)
loadpage(new qurl("http://google.com"))
}
new qpushbutton(win1) {
setGeometry(20,20,100,30)
settext("Print")
setclickevent("print()")
}
showmaximized()
49.34. Printing using QPrinter 450

4. Ring Documentation, Release 1.3
}
exec()
}
func print
printer1 = new qPrinter(0) {
setoutputformat(1) # 1 = pdf
setoutputfilename("test.pdf")
painter = new qpainter() {
begin(printer1)
myfont = new qfont("Times",50,-1,0)
setfont(myfont)
drawtext(100,100,"test")
printer1.newpage()
drawtext(100,100,"test2")
endpaint()
}
}
printer1 = new qPrinter(0) {
setoutputformat(1)
setoutputfilename("test2.pdf")
myweb.print(printer1)
myweb.show()
}
system ("test.pdf")
system ("test2.pdf")
49.35 Creating More than one Window
The next example demonstrates how to create more than one window
Load "guilib.ring"
app1 = new qapp {
win1 = new qwidget() {
setwindowtitle("First")
setgeometry(100,100,500,500)
new qpushbutton(win1) {
setgeometry(100,100,100,30)
settext("close")
setclickevent("app1.quit()")
}
new qpushbutton(win1) {
setgeometry(250,100,100,30)
settext("Second")
setclickevent("second()")
}
showmaximized()
}
exec()
}
49.35. Creating More than one Window 451

5. Ring Documentation, Release 1.3
func second
win2 = new qwidget() {
setwindowtitle("Second")
setgeometry(100,100,500,500)
setwindowflags(Qt_dialog)
show()
}
The application during the runtime
49.36 Playing Sound
Example:
Load "guilib.ring"
new qapp {
win1 = new qwidget() {
setwindowtitle("play sound!") show()
}
new qmediaplayer() {
setmedia(new qurl("footstep.wav"))
setvolume(50) play()
}
exec()
}
49.37 Using the QColorDialog Class
Example:
49.36. Playing Sound 452

6. Ring Documentation, Release 1.3
Load "guilib.ring"
oApp = new myapp { start() }
Class MyApp
oColor win1
Func start
myapp = new qapp
win1 = new qMainWindow() {
setwindowtitle("Color Dialog")
setgeometry(100,100,400,400)
}
new qpushbutton(win1) {
setgeometry(10,10,100,30)
settext("Get Color")
setclickevent("oApp.pColor()")
}
win1.show()
myapp.exec()
Func pColor
myobj = new qcolordialog()
aColor = myobj.GetColor()
r=acolor[1] g=acolor[2] b=acolor[3]
win1.setstylesheet("background-color: rgb("+r+", " + g+ "," + b + ")")
The application during the runtime
49.37. Using the QColorDialog Class 453

7. Ring Documentation, Release 1.3
49.38 Using qLCDNumber Class
In this example we will learn about using the qLCDNumber class
Load "guilib.ring"
New qApp
{
win1 = new qWidget()
{
setwindowtitle("LCD Number")
setgeometry(100,100,250,120)
new qLCDNumber(win1)
{
setgeometry(10,10,100,40)
display(100)
}
new qLCDNumber(win1)
{
setgeometry(10,60,100,40)
display(80)
}
show()
}
exec()
}
The application during the runtime
49.39 Movable Label Example
Load "guilib.ring"
new qApp {
win1 = new qWidget()
{
49.38. Using qLCDNumber Class 454

8. Ring Documentation, Release 1.3
label1 = new qLabel(win1)
{
setText("Welcome")
setgeometry(10,10,200,50)
setstylesheet("color: purple ; font-size: 30pt;")
}
new qTimer(win1)
{
setInterVal(10)
setTimeOutEvent("pMove()")
start()
}
setWindowTitle("Movable Label")
setgeometry(100,100,600,80)
setStyleSheet("background-color: white;")
show()
}
exec()
}
Func pMove
label1
{
move(x()+1,y())
if x() > 600
move(10,y())
ok
}
The application during the runtime
49.40 QMessagebox Example
In this section we will learn how to check the output of the Message box
Load "guilib.ring"
new qApp {
win1 = new qWidget()
{
label1 = new qpushbutton(win1)
{
setText("Test")
setgeometry(10,10,200,50)
49.40. QMessagebox Example 455

9. Ring Documentation, Release 1.3
setstylesheet("color: purple ; font-size: 30pt;")
setclickevent("pWork()")
}
setWindowTitle("Messagebox")
setgeometry(100,100,600,80)
setStyleSheet("background-color: white;")
show()
}
exec()
}
func pWork
new qmessagebox(win1)
{
setwindowtitle("messagebox title")
settext("messagebox text")
setInformativeText("Do you want to save your changes?")
setstandardbuttons(QMessageBox_Yes | QMessageBox_No | QMessageBox_Close)
result = exec()
win1 {
if result = QMessageBox_Yes
setwindowtitle("Yes")
but result = QMessageBox_No
setwindowtitle("No")
but result = QMessageBox_Close
setwindowtitle("Close")
ok
}
}
The application during the runtime
49.41 Using QInputDialog Class
In the next example we will learn about using the QInputDialog class
49.41. Using QInputDialog Class 456

10. Ring Documentation, Release 1.3
Load "guilib.ring"
New QApp {
Win1 = New QWidget () {
SetGeometry(100,100,400,400)
SetWindowTitle("Input Dialog")
New QPushButton(win1)
{
SetText ("Input Dialog")
SetGeometry(100,100,100,30)
SetClickEvent("pWork()")
}
Show()
}
exec()
}
Func pWork
oInput = New QInputDialog(win1)
{
setwindowtitle("What is your name?")
setgeometry(100,100,400,50)
setlabeltext("User Name")
settextvalue("Mahmoud")
lcheck = exec()
if lCheck win1.setwindowtitle(oInput.textvalue()) ok
}
The application during the runtime
49.41. Using QInputDialog Class 457