QItemDelegate Context Menu

[aekilic]

Dear All

We have a QTableWidget and we make a delegate for this. For one of the coloumn we need a context menu. We could bring a context menu but the problem is context menu is not standart. Is there a solution for this, or can you make a sugestion for this?

Please help

[wysota]

Delegate has nothing to do with context menus. You have to do that in the view like for any other widget.

[aekilic]

What I mean is like this

In my delegate fuction I have createActions to create action which changes in every row.

void ProformaDelegate::createActions()
{
 
QSqlQuery fiyat_tipleri;
fiyat_tipleri.exec("SELECT id, stokid from table where if = '" + xxx +"';");
int i = 0;
while(fiyat_tipleri.next()){
 
	         recentFileActs[i] = new QAction(fiyat_tipleri.value(3).toString(), this);
 
	         ++i;
	         sayi = i;
}
}

void ProformaDelegate::createActions()
{

QSqlQuery fiyat_tipleri;
fiyat_tipleri.exec("SELECT id, stokid from table where if = '" + xxx +"';");
int i = 0;
while(fiyat_tipleri.next()){

	         recentFileActs[i] = new QAction(fiyat_tipleri.value(3).toString(), this);

	         ++i;
	         sayi = i;
}
}

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And in createEditor part I ask for the delegate.

else if(index.column() == 5 || index.column() == 8)
	{
 
		MyDoubleSpinBox2 *editor = new MyDoubleSpinBox2(parent);
		editor->setMinimum(0);
		editor->setMaximum(4000000000);
		editor->setDecimals(4);
		editor->setSuffix(" " + totalParaBirimi);
		editor->setAlignment(Qt::AlignRight);
 
	     for (int i = 0; i < sayi; ++i)
	    editor->addAction(recentFileActs[i]);
		editor->setContextMenuPolicy(Qt::ActionsContextMenu);
 
		return editor;
	}

else if(index.column() == 5 || index.column() == 8)
	{

		MyDoubleSpinBox2 *editor = new MyDoubleSpinBox2(parent);
		editor->setMinimum(0);
		editor->setMaximum(4000000000);
		editor->setDecimals(4);
		editor->setSuffix(" " + totalParaBirimi);
		editor->setAlignment(Qt::AlignRight);

	     for (int i = 0; i < sayi; ++i)
	    editor->addAction(recentFileActs[i]);
		editor->setContextMenuPolicy(Qt::ActionsContextMenu);

		return editor;
	}

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The problem is I could not start createActions() functions from createEditor() part, and also send information (xxx) for the SQL query

[wysota]

What do you mean you couldn't start it? It doesn't compile or you don't see the result or...? BTW. I think your SQL statement is invalid - 'if' is probably a function name which may cause a clash with a database field with the same name if you have one.

[aekilic]

I dont have a problem in compiling.

But what I want to do is everytime I come to column 5 of column 8 I want the delegate start fuction createActions(), but when I write like this

if(index.column() == 5 || index.column() == 8)
 
          {
              MyDoubleSpinBox2 *editor = new MyDoubleSpinBox2(parent);
              editor->setMinimum(0);
              editor->setMaximum(4000000000);
              editor->setDecimals(4);
              editor->setSuffix(" " + totalParaBirimi);
              editor->setAlignment(Qt::AlignRight);
 
              createActions();
 
               for (int i = 0; i < sayi; ++i)
              editor->addAction(recentFileActs[i]);
              editor->setContextMenuPolicy(Qt::ActionsContextMenu);
 
              return editor;
 
          }

if(index.column() == 5 || index.column() == 8)

          {
              MyDoubleSpinBox2 *editor = new MyDoubleSpinBox2(parent);
              editor->setMinimum(0);
              editor->setMaximum(4000000000);
              editor->setDecimals(4);
              editor->setSuffix(" " + totalParaBirimi);
              editor->setAlignment(Qt::AlignRight);

              createActions();

               for (int i = 0; i < sayi; ++i)
              editor->addAction(recentFileActs[i]);
              editor->setContextMenuPolicy(Qt::ActionsContextMenu);

              return editor;

          }

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I could not compile it. I get a error like

error: passing `const ProformaDelegate'
as `this' argument of `void ProformaDelegate::createActions()' discards qualifie
rs

[aekilic]

any idea? How can I do it?

[wysota]

In general you shouldn't do it this way or you should make your createActions() method const.

[aekilic]

I understand,

But can you help me how can I do it?

What I would like to do is,

Think about a qtablewidget,

for every row there are different data. For everydata (for every row) I would like to biring a information from SQL, when context menu requested, I need to run sql query with a data on the row and bring information for the row with context.

Can you help?

[wysota]

Reimplement contextMenuEvent() from QTableWidget.

[aekilic]

any example you could help me?

[jpn]

any example you could help me?

http://www.qtcentre.org/forum/p-drag...ostcount2.html

[aekilic]

the problem I have now is,

I could use

connect(tableProformaindex, SIGNAL(customContextMenuRequested (QPoint)), this, SLOT(createActions(QPoint)));

but after the window open it works one time, but after that it never works.

[aekilic]

any thing you could help me?

[jpn]

the problem I have now is,

I could use

connect(tableProformaindex, SIGNAL(customContextMenuRequested (QPoint)), this, SLOT(createActions(QPoint)));

but after the window open it works one time, but after that it never works.

There is no way we can help you unless you show the relevant code.

[aekilic]

Dear Jpn

What we are trying to is, for every row of a QTableWidget, we need a new menu...

Is there a way that we could do it?

[wysota]

Yes, create a regular context menu In the event handler create an instance of QMenu, assign it the actions you want to show and call QMenu::exec(). And please read the docs.

[jpn]

What we are trying to is, for every row of a QTableWidget, we need a new menu...

Is there a way that we could do it?

I have already posted a link which shows an example how to do it. Use QTableWidget::itemAt() to get the item below requested point. Here's one more example with signals and slots: http://www.qtcentre.org/forum/p-qlis...ostcount5.html