How to pass multiple objects one after another in to loop..?

Rohith

Hi,

I have created around 30 items using the QTableWidgetItem that cotains a chech box for each by using the below line


a = new QTableWidgetItem("a");
a->setCheckState(Qt::Unchecked);

b = new QTableWidgetItem("a");
b->setCheckState(Qt::Unchecked);

and so on

And i have provided a quit button and when ever the user clicks on the quit button all the chechboxes need to be unchekced weather they are checked or not checked to do so i am trying to pass all the object names one after another into a loop as shown below

QStringList items;
items<<"a"<<"b";

    for(int i=0; i<items.size(); i++)
    {
        QTableWidgetItem items.at(i) = new QTableWidgetItem;
    }

and this is showing an error
"Expected intializer before '.' token"

Will the method i am trying to use will be possible or is there any other way todo so
Please guide me
Thanks in advance,
Rohith.G

mrjj

Hi
When I read the text and see the code, i get very confused.

So im not really sure what you are trying to do.
So I will be guessing
you want a list of the a,b,c,d,e items so u can uncheck them.

you can build a list this way

int iColumns = my_table.columnCount();
int iRows = my_table.rowCount();
QList<QWidgetItem*> myList;
for(int i = 0; i < iRows; ++i) {
  for(int j = 0; j < iColumn; ++j) {
    QTableWidgetItem* pWidget = my_table->item(i, j);
    myList.append(pWigdet);
  }
}

now all your items are in myList;

You could also just call
pWidget ->setCheckState(Qt::Unchecked);
instead of myList.append(pWigdet); to do it directly instead of adding to list.

I hope it answered what you ask :)

Rohith

Hi mrjj,

Thanks for replying sorry for writing the question in such a enigmatic way.
The thing i want to do is after creating multiple multiple qTableWidgetItems that can accept a selection in the form of checkboxes and when ever the user clicks on quit button all the checkboxes that are selected need to be unselected.

a = new QTableWidgetItem("a");
a->setCheckState(Qt::Unchecked);

b = new QTableWidgetItem("b");
b->setCheckState(Qt::Unchecked);

.
.
.
.

z = new QTableWidgetItem("z");
z->setCheckState(Qt::Unchecked);

and i am unchecking them in the below way

a->setCheckState(Qt::Unchecked);
b->setCheckState(Qt::Unchecked);
.
.
.
z->setCheckState(Qt::Unchecked);

To avoid huge no of lines i am trying to uncheck each item by passing the objects in to for loop as stated in above my post

QStringList items;
items<<"a"<<"b"<<....<<"z";

    for(int i=0; i<items.size(); i++)
    {
        QTableWidgetItem items.at(i) = new QTableWidgetItem;
    }

Thanks in advance,
Rohith.G

mrjj

@mrjj said:
Ok, but you have access to the items via the
table->item(i, j);
That is how you can get the items to uncheck them.
What is wrong with that way?

--
this code makes no sense to me. Its not valid.
Items is a stringlist so
" QTableWidgetItem items.at(i)"
makes no sense to me. you cannot write like that.
Its a list of strings and have nothing to do with QTableWidgetItem.

  for(int i=0; i<items.size(); i++)
    {
        QTableWidgetItem items.at(i) = new QTableWidgetItem;
    }

Rohith

Hi mrjj,

I have tried by following your method as below


    int iColumns = table->columnCount();
    int iRows = table->rowCount();

    for(int i = 0; i < iRows; ++i) {
      for(int j = 0; j < iColumns; ++j) {
          qDebug("Inside the for loop");
        QTableWidgetItem* pWidget = table->item(i, j);
        pWidget->setCheckState(Qt::Unchecked);
//        myList.append(pWigdet);
      }
    }

But this is compiling fine and after running when ever the quit button is clicked
It is entering into the slot but the gui was closing by apperance of below line
"The program has unexpectedly finished."

mrjj

ok
please insert check
if (pWidget)
pWidget->setCheckState(Qt::Unchecked);

if it still crashes, then put break point on and see what line.

Also, table is your table , correct ?
You have new it and added the items to it?

Rohith

Hi mrjj,

Your Code was working and sorry to say this i have written the object name and display string name differently```

//Previous Syntax
z = new QTableWidgetItem("z");
z->setCheckState(Qt::Unchecked);

//New Syntax
z = new QTableWidgetItem("X");
z->setCheckState(Qt::Unchecked);


Can you please help me to solve as per new requirement

mrjj

@Rohith
Hi
Good the other worked.

Im not sure what you ask about ?
you replace "z" with "X"

So what do you need help with?

Rohith

@mrjj

The thing is that code that you have posted is working
if the both the object name and displaying name are same then the the operation uncheck is working it means

z = new QTableWidgetItem("z");
z->setCheckState(Qt::Unchecked);

in the above code z is the object name and the data present in double qoutes "z" is the data that display on GUI, your code was executing

QTableWidgetItem* pWidget = table->item(i, j);
table->item(i,j) is retreving the data that we are writing in the doublequotes which will display on GUI it was not retreving the object name of item that i have created using QTableWidgetItem *z(ObjectName) = new QTableWidgetItem("Z"(data displays on Gui));

if(z(pWidget)
z(pWidget)->setCheckState(Qt::Unchecked)

but know i have changed my syntax to

z = new QTableWidgetItem("X");
z->setCheckState(Qt::Unchecked);

Hope You understand now,
Rohith.G

mrjj

sorry, im not sure i understand

z = new QTableWidgetItem("z");
z->setCheckState(Qt::Unchecked);

z is just a variable name of type QTableWidgetItem *
"z" is the Text for the QTableWidgetItem .

table->item(i, j); do not care how u inserted the items.
This would do the same

QTableWidgetItem *MyItem = new QTableWidgetItem("z");
MyItem->setCheckState(Qt::Unchecked);

and table->item(i, j) would still work.

Rohith

@mrjj

Sorry for my wrong assumption the Code working fine in any condition and thanks a lot for your help and answering my doubts patiently thankyou very much for you help

Rohith.G

mrjj

@Rohith

np. sometimes its hard to understand the real issue
when seeing just part of code but
glad it worked :)

you are very welcome.