The Ring programming language version 1.8 book - Part 73 of 202

Ring Documentation, Release 1.8
60.45. Moving Objects using the Mouse 691

60.45. Moving Objects using the Mouse 692

60.46 Inheritance from GUI Classes
Example :
Load "guilib.ring"
New MyWindow()
new qApp { exec() }
class mywindow from qwidget
Func init
super.init()
setwindowtitle("First Window")
setgeometry(100,100,400,400)
setstylesheet("background-color: purple;")
settooltip("my first window!")
show()
The application during the runtime
60.46. Inheritance from GUI Classes 693

60.47 Using QDesktopWidget Class
In the next example we will learn about using the QDesktopWidget class
Load "guilib.ring"
New qApp {
win1 = New qWidget()
{
resize(400,400)
btn1 = new qPushbutton(win1)
{
setText("Center")
move(100,100)
resize(100,30)
setClickEvent("pCenter()")
}
Show()
}
exec()
}
Func pCenter
oDesktop = new qDesktopWidget()
60.47. Using QDesktopWidget Class 694

oRect = oDesktop.screenGeometry( oDesktop.primaryScreen() )
win1.move((oRect.width()-win1.width()) /2 , (oRect.Height()-win1.Height())/2 )
win1.show()
60.48 Rotate Text
The next example rotate text using a Timer.
Load "guilib.ring"
nAngle = 0
New qapp {
win1 = new qwidget() {
setwindowtitle("Rotate Text")
resize(800,600)
label1 = new qlabel(win1) {
settext("")
myfilter = new qallevents(win1)
myfilter.setMouseButtonPressevent("pClick()")
installeventfilter(myfilter)
}
new qtimer(win1) {
setinterval(50)
60.48. Rotate Text 695

settimeoutevent("pTime()")
start()
}
pDraw()
L1 = new qVBoxLayout() { AddWidget(Label1) } SetLayout(L1)
showMaximized()
}
exec()
}
Func pDraw
p1 = new qpicture()
color = new qcolor() {
setrgb(0,0,255,255)
}
pen = new qpen() {
setcolor(color)
setwidth(50)
}
painter = new qpainter() {
begin(p1)
setpen(pen)
myfont = font()
myfont.setpointsize(50)
setfont(myfont)
rotate(nAngle)
drawtext(350,0*nAngle,"welcome")
drawtext(0,0*nAngle,"welcome")
endpaint()
}
label1 {
setpicture(p1)
show()
}
Func pClick
win1 { setwindowtitle("Click Event") }
Func pTime
nAngle++
if nAngle = 90
nAngle = 10
ok
pDraw()
60.48. Rotate Text 696

60.49 Change Focus
The next example change the focus using the ENTER key.
load "guilib.ring"
new qApp {
win = new qWidget() {
resize(600,600)
SetWindowTitle("Change Focus")
text1 = new qLineEdit(win)
layout1 = new qVBoxLayout() {
AddWidget(text1)
AddWidget(text2)
AddWidget(text3)
AddWidget(text4)
}
setLayout(Layout1)
60.49. Change Focus 697

aList = [text1,text2,text3,text4]
oFilter = new qallevents(win)
oFilter.setKeyPressEvent("pWork()")
installeventfilter(oFilter)
show()
}
exec()
}
func pWork
nCode = oFilter.getkeycode()
if nCode = 16777220 # ENTER Key
for x=1 to len(aList)
if aList[x].HasFocus()
t = x+1
if t > len(aList) t=1 ok
aList[t].SetFocus(0)
exit
ok
next
ok
60.50 Regular Expressions
The next example uses the Regular Expressions classes.
load "guilib.ring"
new qApp
{
see "Using Regular Expressions" + nl
exp = new qregularexpression() {
setPattern("dd w+")
see pattern() + nl
match = match("33 one",0,0,0)
see match.hasmatch() + nl
match = match("3 one",0,0,0)
match = match("welcome 11 one",0,0,0)
matched = match.captured(0)
see matched + nl
}
exp = new qregularexpression() {
setPattern("^(dd)/(dd)/(dddd)$")
see pattern() + nl
match = match("08/12/1985",0,0,0)
day = match.captured(1)
month = match.captured(2)
year = match.captured(3)
see day + nl + month + nl + year + nl
see "(" + match.capturedStart(1) + "," + match.capturedEnd(1)+ ")" + nl
60.50. Regular Expressions 698

}
}
Output
Using Regular Expressions
dd w+
1
0
1
11 one
^(dd)/(dd)/(dddd)$
1
08
12
1985
(0,2)
(3,5)
(6,10)
60.51 Simple Client and Server Example
In this section we will learn about creating simple Client and Server Application
Load "guilib.ring"
new qApp {
oClient = new Client { client() }
oServer = new Server { server() }
exec()
}
Class Client
win1 lineedit1 cOutput=""
oTcpSocket
func client
win1 = new qwidget()
new qpushbutton(win1) {
setgeometry(50,50,100,30)
settext("connect")
setclickevent("oClient.Connect()")
}
lineedit1 = new qtextedit(win1) {
setGeometry(150,50,200,300)
}
win1 {
setwindowtitle("client")
setgeometry(10,100,400,400)
show()
60.51. Simple Client and Server Example 699

}
func connect
cOutput = "Connect to host 127.0.0.1 port 9999" + nl
lineedit1.settext(cOutput)
oTcpSocket = new qTcpSocket(win1) {
setconnectedevent("oClient.pConnected()")
setreadyreadevent("oClient.pRead()")
connecttohost("127.0.0.1",9999,3,0)
waitforconnected(5000)
}
func pConnected
cOutput += "Connected!" + nl
func pRead
cOutput += "Ready Read!" + nl
cOutput += oTcpSocket.readall().data() + nl
Class Server
win1 lineedit1
oTcpServer oTcpClient
cOutput = ""
func server
win1 = new qwidget()
lineedit1 = new qtextedit(win1) {
setGeometry(150,50,200,300)
}
win1 {
setwindowtitle("Server")
setgeometry(450,100,400,400)
show()
}
oTcpServer = new qTcpServer(win1) {
setNewConnectionEvent("oServer.pNewConnection()")
oHostAddress = new qHostAddress()
oHostAddress.SetAddress("127.0.0.1")
listen(oHostAddress,9999)
}
cOutput = "Server Started" + nl +
"listen to port 9999" + nl
Func pNewConnection
oTcpClient = oTcpServer.nextPendingConnection()
60.51. Simple Client and Server Example 700

The Ring programming language version 1.8 book - Part 73 of 202

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The Ring programming language version 1.8 book - Part 73 of 202