Display Problem

[faldzip]

if delete the SetVisible (true) line ....... Simple my project is executed and nothing it showed ,even mainwindow too.

Because it crashes even before MainWindow is showed.

[yuvaraj.yadav]

Thanks

Totally i confused . I referred the QArstractViewModel::item().....

There we set the rows and columns .....Here My tweets going to set row by row according to loop....

Already I asked you ,can you provide me one sample example ....

or where can i get sample example ......

Thanks

Yuvaraj R

[faldzip]

Dude, you are not creating items any where.
What are doing is that you want to get the pointer to an item:

item(13);

item(13);

To copy to clipboard, switch view to plain text mode 

this will return the pointer QStandardItem * to the item in row = 13. Then you want to assign some widget (your Twitt) to that item. How can you do this if you model is empty?
In your code you are not inserting items to the model. You are setting size hints to item which DON'T EXIST. There is no item at row = 13. There is no item in row = 0, 1, 2, 3, 4, 5... So how do you want to set the size hint to those items? How do you want to assign widgets to those items? You are getting NULL pointer (do you know whats that? please confirm!) and you want to set size hint to this. The ONLY result of that is segmentation fault! You have to insert some items to the model! There are several ways to do that. Just take a look in QStandardItemModel docs and/or some Qt Examples & Demos - for exapmle appendRow() method would be useful. The sample code is already on your hard drive for that last week, so why you can't just check in docs how you can insert an item to the model?
It takes less time than a week to get thorugh the examples and docs.

[yuvaraj.yadav]

Thanks my Guru....


Now I understood my mistake.......


Here my code according to you......

Tweet *tweet = new Tweet(this);
QStandardItem *newItem = new QStandardItem;
QStandardItemModel ::appendRow(newItem);
ui->listWidget->setIndexWidget(newItem->index(),tweet);

This one is displaying empty mainwinow only...

[faldzip]

okey, now you know how to put items to the QStandardItemModel.
But... your QStandardItemModel has nothing to do with your QListWidget... Change QListWidget to QListView, and than you have to set your model to list view, so the view knows what to display.

[yuvaraj.yadav]

Hi

Thanks for your reply ... Now it is displaying my frame on listview....


Now problem is how do display the my 20 tweets in listview...

Here i used for loop....

But nothing happened ...

Another one How do insertRows in listview..

I tried with

QStandard ItemModel :: insertRows(20,1, newItems).... nothing happened

Here my total rows 20,counter value 1...

please explain me using loop how do display same my 20 tweets


please help me

Thanks

Yuvaraj

[aamer4yu]

Read the docs properly, they are of great help.
From the docs -

bool QAbstractItemModel::insertRows ( int row, int count, const QModelIndex & parent = QModelIndex() ) [virtual]
On models that support this, inserts count rows into the model before the given row.

and as for you, count shud be 20,,,get the point ??

[faldzip]

or just make the for loop and in every pass append one item to the model, get its index and set the Twitt widget for this.

[yuvaraj.yadav]

Thanks for your reply...


I didn't get you..



for( int i =0; i<rowCount();i++)
{
QStandardItemModel::insertRow( i, newItem );
view->setIndexWidget( newItem->index(), tweet );
}

Can you give sample code

[faldzip]

tell me what number you get from rowCount() at the start of the for loop?

[yuvaraj.yadav]

one , am i correct..

We can display 24 items in listview..


please give one sample code

[faldzip]

okej, use this code, but first remove QStandardItemModel inheritance from mainwindow.h

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent), ui(new Ui::MainWindowClass)
{
	ui->setupUi(this);
 
	QStandardItemModel * model = new QStandardItemModel(this);
	for (int i = 0; i < 24; ++i)
	{
		QStandardItem * item = new QStandardItem;
		model->appendRow(item);
	}
 
	ui->listView->setModel(model);
 
	for (int i = 0; i < 24; ++i)
	{
		Tweet * t = new Tweet(this);
		t->resize(ui->listView->size().width(), 70);
		model->item(i)->setSizeHint(t->size());
		ui->listView->setIndexWidget(model->item(i)->index(), t);
	}
}

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent), ui(new Ui::MainWindowClass)
{
	ui->setupUi(this);

	QStandardItemModel * model = new QStandardItemModel(this);
	for (int i = 0; i < 24; ++i)
	{
		QStandardItem * item = new QStandardItem;
		model->appendRow(item);
	}

	ui->listView->setModel(model);

	for (int i = 0; i < 24; ++i)
	{
		Tweet * t = new Tweet(this);
		t->resize(ui->listView->size().width(), 70);
		model->item(i)->setSizeHint(t->size());
		ui->listView->setIndexWidget(model->item(i)->index(), t);
	}
}

To copy to clipboard, switch view to plain text mode 

And now take a one week free from work/school and spend it on learning C++ and reading docs. And try to do something by yourself next time - but not just guessing - just check what those methods, classes and C++ keywords and operators do! It's simple - you can just use Google (www.google.com) to find C++ tutorial (and English Lessons/Dictionaries if you can understand docs - but how you can say that if dont mind even opening single document?)