QStyledItemDelegate with QLineEdit

[Elnur_Ismailzada]

I want to draw a QLineEdit in the cell of the table.
I have:

class ItemDelegate : public QStyledItemDelegate
{
public:
...
void paint(QPainter *painter, const QStyleOptionViewItem &option,
               const QModelIndex &index) const override
{
        QStyleOptionFrameV2 *panelFrame = new QStyleOptionFrameV2;
        QLineEdit *search = new QLineEdit;
        panelFrame->initFrom(search);
        panelFrame->rect = option.rect;
        panelFrame->state |= QStyle::State_Sunken;
        QApplication::style()->drawPrimitive(QStyle::PE_PanelLineEdit, panelFrame, painter);
}
...

But this code does not work. How can i solve this problem?

[mrjj]

Hi
What does it draw ?
In what way does not work ?
Note: you should delete both panelFrame and search as else you leak.
ps. did you get code from here ?
https://stackoverflow.com/questions/9897594/qt-how-to-draw-a-dummy-line-edit-control

[Elnur_Ismailzada]

@mrjj
The result of this code: I can not write a text.

[Elnur_Ismailzada]

@mrjj said in QStyledItemDelegate with QLineEdit:

ps. did you get code from here ?
https://stackoverflow.com/questions/9897594/qt-how-to-draw-a-dummy-line-edit-control

I have seen that. Here I can not write a text too.

[mrjj]

@Elnur_Ismailzada
No, as its painted. ?
If you want it "alive", you must provide full Delegate with CreateEditor also to make
a real edit when in edit mode. The paint part if only for non edit mode.

http://doc.qt.io/qt-5/qtwidgets-itemviews-stardelegate-example.html
You did also implement
QWidget *createEditor(QWidget *parent, const QStyleOptionViewItem &option,
const QModelIndex &index) const override;
void setEditorData(QWidget *editor, const QModelIndex &index) const override;
?

[mrjj]

@Elnur_Ismailzada said in QStyledItemDelegate with QLineEdit:

I have seen that. Here I can not write a text too.

You mean it wont draw its text ?
did you try setting text on search?
Since its empty as you just create it.

[Elnur_Ismailzada]

@mrjj said in QStyledItemDelegate with QLineEdit:

You did also implement
QWidget *createEditor(QWidget *parent, const QStyleOptionViewItem &option,
const QModelIndex &index) const override;
void setEditorData(QWidget *editor, const QModelIndex &index) const override;

No. I'll try and let you know. thx

You mean it wont draw its text ?
did you try setting text on search?

Yes and yes.

[mrjj]

@Elnur_Ismailzada

Hi
There is one thing i do wonder.
The default delegate for the Views is a LineEdit so
can i ask why you want to replace it again with delegate ?
You want draw extra stuff on it or how come the normal one is not good enough ?

[Elnur_Ismailzada]

@mrjj
Hi!
I want to draw three QLineEdit in a table cell.

[mrjj]

@Elnur_Ismailzada
So you want each cell to have 3 values?
Well u can do that with delegate but most of the work will be handling the editor widget.
it must then contain 3 Edits so user can select which one to edit and
you must handle writing back the data to the model in correct index.