How to create multiple QListWidgetItem instances dynamically in Qt?

[kishore_hemmady]

I'm able to create 1 instance below
videoNewItem = new QListWidgetItem("videoNewItem", ui->video_listWidget);
How to create multiple such objects?

[jsulm]

@kishore_hemmady I don't understand the question. You create other objects in the same way you create the one in your example. What does not work?

videoNewItem1 = new QListWidgetItem("videoNewItem", ui->video_listWidget);
videoNewItem2 = new QListWidgetItem("videoNewItem", ui->video_listWidget);
videoNewItem3 = new QListWidgetItem("videoNewItem", ui->video_listWidget);
...

[kishore_hemmady]

hi @jsulm
i need to declare an array of object for the QListWidgetItem class;
something like the below

QListWidgetItem *nodeItem;

nodeItem=new QListWidgetItem[NUMBERS]("videoNewItem", ui->video_listWidget);

how can i create the array of object here with the parameterized constructor call???

[jsulm]

@kishore_hemmady Why do you want to have an array? You can use a QVector or QList:

QList<QListWidgetItem*> items;
for (int i = 0; i < 10; ++i)
    items.append(new QListWidgetItem(QString("videoNewItem_") + i, ui->video_listWidget));

If you really want to have an array:

QListWidgetItem* items[10];
for (int i = 0; i < 10; ++i)
    items[i] = new QListWidgetItem(QString("videoNewItem_") + i, ui->video_listWidget);

[J.Hilk]

additionaly to what @jsulm said,

a QlistWidgetItem is rather useless without QListWidget to put them into, and QListWidget has 3 functions to access any QListWidgetItem it contains:

• QListWidgetItem * item(int row) const
• QListWidgetItem * itemAt(const QPoint & p) const
• QListWidgetItem * itemAt(int x, int y) const

[kishore_hemmady]

thank you @jsulm
How can i access the Nth items in the list.

[jsulm]

@kishore_hemmady Why don't you read documentation? http://doc.qt.io/qt-5/qlist.html
items[i]...

[kishore_hemmady]

@jsulm
i am doing the same , its not showing error but crashing.
thats why asked is there any other method to do this.

[kishore_hemmady]

@jsulm

HI

this is my code for getting playlist for video files for different video zones.

QList<QListWidgetItem*> videoNewItem
for(INT32 i=0;i<i32NumberOfVideoZones;i++){
            videoNewItem.append(new QListWidgetItem(QString("videoNewItem_") + i, ui->video_listWidget));
        }

void MainWindow::on_add_file_clicked()
{

             int row = 1;
          videoNewItem[i32tContainerindex] = new QListWidgetItem(QString("videoNewItem_") + i32tContainerindex,    ui->video_listWidget);
                videoNewItem[i32tContainerindex]->setFlags (videoNewItem[i32tContainerindex]->flags() | Qt::ItemIsUserCheckable);
               videoNewItem[i32tContainerindex]->setCheckState (Qt::Unchecked);

                videoNewItem[i32tContainerindex]->setText ((ui->video_file_name_lineEdit->text()));
                ui->video_listWidget->insertItem (row, videoNewItem[i32tContainerindex]);
                ui->video_listWidget->addItem (videoNewItem[i32tContainerindex]);
                ui->video_listWidget->show();
                ui->video_file_name_lineEdit->setText ("");
                ui->video_listWidget->addItem (videoNewItem[i32tContainerindex]);
                ui->video_listWidget->repaint();
                GUI_videostruct[i32tContainerindex].videoFileName=ui->video_listWidget->item(0)->text();

}

but when i change the video zone from index 0 to 1, i ll retain the value(files) of videoNewItem[0] in videoNewItem[1] listWidget playlist
i want to get the different files for different zones.

[jsulm]

@kishore_hemmady Are you talking about changing i32tContainerindex from 0 to 1? Because I don't understand your description. Where and how do you change it? Are you sure it is actually changed?

[kishore_hemmady]

yes I am changing i32tContainerindex from 0 to 1.
I am developing a page which contains listWidget, whenever i am switching from videoNewItem[0]'s listWidget to videoNewItem[1]
listWidget i am not able to show only videoNewItem[1] listWidget rather i am getting the content of both the listWidget

[jsulm]

@kishore_hemmady Sorry, I don't know your code, so I don't know what you're doing wrong. Did you try to debug your app to see what happens?

[kishore_hemmady]

This post is deleted!

[jsulm]

@kishore_hemmady I already understood before, but how this picture can help me to find the issue? The issue is in your code...

[SGaist]

Hi,

That looks like over engineering. Furthermore, you are calling insertItem and right after that addItem twice with exactly the same item. Then you also update your GUI_videostruct data using an index on one side and a hardcoded value on the other side.

You should rather explain what exactly you are trying to achieve. Also since you are using a QListWidget, there's no real need to keep a list of the item besides since you already have them available through QListWidget.