QListWidget --- How do you get the Item Value ?

[Bert Mariani]

Hi Mahmoud

 In your example on:   http://ring-lang.net/   

   Desktop and Mobile development using RingQt¶ Using the QListWidget Class

 How do you get the item value returned in func pWork

 I want to extract the word "three" rather than the currentRow "2" when select button is pressed.

 You can see what I tried below.

=========================

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"]    # <<<  Item positions and values 

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()

}

/*

From QListWidget Doc  http://doc.qt.io/qt-4.8/qlistwidget.html

   QListWidgetItem * currentItem() const

   int               currentRow() const

   QListWidgetItem * item(int row) const

*/

func pWork

  btn1.settext(string(list1.currentrow()))     

  See "1Row " + list1.currentRow() +nl        # <<< Returns Row number selected

### These do NOT work !!!

  #See " 2Item " + list1.currentItem() +nl 

  #See " 3Item " + list1.item() +nl

  #See " 4Item " + list1.item(2) +nl

  #See " 5Item " + string(list1.currentItem() ) +nl

  #See " 6Item " + string( list1.item() ) +nl

  #See " 7Item " + string(list1.item(2) ) +nl

func pWork2

list1 {

takeitem(currentrow())

}

[Mahmoud Fayed]

Hello Bert

To do that you need the QListWidgetItem class.

I have already added the class to RingQt

Just download the last binary update

Windows : https://sourceforge.net/projects/ring-lang/files/Ring%201.0/Fayed_Ring_1.0_win32_binary_release.zip/download

Linux : https://sourceforge.net/projects/ring-lang/files/Ring%201.0/Fayed_Ring_1.0_Ubuntu_32bit_binary_release.zip/download

Now the next sample demonstrates how to do this

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() )

               }

              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

        if list1.currentrow() > 0

        btn1.settext( list1.item(list1.currentrow()).text() ) ok

func pWork2

        list1 {

               takeitem(currentrow())

       }

From the previous example 

the list.item() method will get the QListWidgetItem object using the item row 

Then using the text() method from the QListWidgetItem we get the value

References : 

(1) http://doc.qt.io/qt-4.8/qlistwidget.html

(2) http://doc.qt.io/qt-4.8/qlistwidgetitem.html

Greetings,

Mahmoud

[Bert Mariani]

Thanks Mahmoud

It required the  last binary update to work.

There is a small error in the sample code. (Qt  uses  "Index 0" ) 

Can Ring-Lang take care of this so that it reports as  -- Index 1 --  (hate those index 0's )

This is the output from the extra statements I added.

However the Button  label itself never shows the value "one" 

     Row 4   Item five

     Row 3   Item four

     Row 2   Item three

     Row 1   Item two

     Row 0   Item one   <<<<<

func pWork

        

See "Row " + list1.currentRow()                                        # <<< added to debug

See "   Item " + list1.item( list1.currentrow() ).text() +nl     # <<< added to debug

        if list1.currentrow() > 0                                                              # <<< Error. the "Row 0 = one"

btn1.settext( list1.item(list1.currentrow()).text() ) 

ok

[Mahmoud Fayed]

Hello Bert

Thanks for reporting, Very soon i will update RingQt to increment the index when we get it

and decrements the index when we set it.

I will let you know about this update once i do it after finishing my current task (Ring for Mac OS X)

Greetings,

Mahmoud