QListWidget QObject sender

[Archa4]

I have a list, that has multiple widgets in it (QListWidget with TaskItem's in it). The Task Item can produce a certain signal. How can i find out which one send it? I know I have to use QObject::sender, but I had no luck trying to connect(..., ..., ..., ...) with it... Can anyone, please, answer - what should i do?

[Santosh Reddy]

So, what is exactly is your problem
1. You are not able to make connect() work ?
or
2. You are not able to know which QListWidgetItem has sent the signal ?

byt the way what you mean by "TaskItem"

[Archa4]

TaskItem is a QWidget, that I'm setting on the QListWidget using

list->setItemWidget(list->item(0), new TaskItem);

list->setItemWidget(list->item(0), new TaskItem);

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I don't know HOW to write the connect BECAUSE I don't know, how to point out which list item sent the signal...

---

Added after 16 minutes:

I think I am a little bit closer to the truth:
When the pushButton in taskitem get's clicked, it emits a signal

deleteTaskItem();

deleteTaskItem();

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I can catch it in the class where My list is by using:

connect(item, SIGNAL(deleteTaskItem()), this, SLOT(deleteTaskItem()));

connect(item, SIGNAL(deleteTaskItem()), this, SLOT(deleteTaskItem()));

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Then in the slot I have to use something like QObject* QObject::sender();
But I can't figure out what to do with it...

---

Added after 11 minutes:

I tried to Write in the slot something like this:

void TaskMain::deleteTaskItem()
{
    list->removeItemWidget(sender());
}

void TaskMain::deleteTaskItem()
{
    list->removeItemWidget(sender());
}

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But I need to give as a parameter QListWidgetItem*, and not a QObject*

[ChrisW67]

TaskItem is a QWidget, that I'm setting on the QListWidget using

list->setItemWidget(list->item(0), new TaskItem);

list->setItemWidget(list->item(0), new TaskItem);

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I don't know HOW to write the connect BECAUSE I don't know, how to point out which list item sent the signal...

If you need a pointer to the TaskItem in order to connect it then why don't you just make that explicit. What is wrong with:

TaskItem *ti = new TaskItem(this);
connect(ti, SIGNAL(stuffHappened()), somethingElse, SLOT(interestedInStuff()));
list->setItemWidget(list->item(0), ti);

TaskItem *ti = new TaskItem(this);
connect(ti, SIGNAL(stuffHappened()), somethingElse, SLOT(interestedInStuff()));
list->setItemWidget(list->item(0), ti);

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[FelixB]

But I need to give as a parameter QListWidgetItem*, and not a QObject*

you can use qobject_cast...

if(QListWidgetItem* item = qobject_cast<QListWidgetItem*>(sender()))
  { 
     // do something with item
  }

if(QListWidgetItem* item = qobject_cast<QListWidgetItem*>(sender()))
  { 
     // do something with item
  }

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[Archa4]

Thanks, and I managed to figure this on my own just secs before this posts

void TaskMain::deleteTaskItem()
{
    item = new TaskItem;
    TaskItem *item2 = new TaskItem;
    item = qobject_cast<TaskItem*>(sender());
    for(int i=0; i<list->count(); i++)
    {
        item2 = qobject_cast<TaskItem*>(list->itemWidget(list->item(i)));
        if (item2==item)
            delete list->item(i);
    }
    count--;
    if (list->count()==0)
        addItem();
}

void TaskMain::deleteTaskItem()
{
    item = new TaskItem;
    TaskItem *item2 = new TaskItem;
    item = qobject_cast<TaskItem*>(sender());
    for(int i=0; i<list->count(); i++)
    {
        item2 = qobject_cast<TaskItem*>(list->itemWidget(list->item(i)));
        if (item2==item)
            delete list->item(i);
    }
    count--;
    if (list->count()==0)
        addItem();
}

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[FelixB]

why do you create new objects on the heap? where do you delete them?

item = new TaskItem;
TaskItem *item2 = new TaskItem

item = new TaskItem;
TaskItem *item2 = new TaskItem

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;

[Archa4]

Ok, then how should I solve this?

[FelixB]

I can't tell you how to solve "this" because I don't see any reason why you create these objects.