Problem while applying filter on QTableView with a button column

[JonB]

@Lati
If I'm not mistaken, if @VRonin [call for him to confirm?] sees your setIndexWidget() he will go apoplectic :) He advocates styled item delegates/paint events only..... !

[Lati]

@JonB :) I am sorry for him but unfortunately such beginners exist in every coding community like me. Let's see if @VRonin forgives me :D

(though I guess TableView's column headers are programmed properly! ;) )

[VRonin]

Who summoned my whrath?!

In this case you have to fill a QStyleOptionButton in the delegate's paint method and simply react to the clicked event of the view. It's just a bit tedious to type in the code but it's not complicated

[Lati]

@VRonin Ask for your forgiveness your highness! :)

Thank you for your suggestion, can you please show me an example code or a sample project?

[VRonin]

Something like this

class ButtonDelegate : public QStyledItemDelegate {
    Q_OBJECT
    Q_DISABLE_COPY(ButtonDelegate)
private:
	QStyleOptionButton prepareButtonOption(const QStyleOptionViewItem &option) const{
		QStyleOptionButton buttonOption;
        buttonOption.text = tr("Add Interval");
        buttonOption.rect = option.rect
        buttonOption.features = QStyleOptionButton::None;
        buttonOption.direction = option.direction;
        buttonOption.fontMetrics = option.fontMetrics;
        buttonOption.palette = option.palette;
        buttonOption.styleObject = option.styleObject;
		return buttonOption;
	}
public:
    explicit ButtonDelegate(QObject* parent = Q_NULLPTR)
        :QStyledItemDelegate(parent)
    {}

    void paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const Q_DECL_OVERRIDE{
        Q_ASSERT(index.isValid());
        QStyleOptionViewItem opt = option;
        initStyleOption(&opt, index);
        const QWidget *widget = option.widget;
        QStyle *style = widget ? widget->style() : QApplication::style();
        QStyleOptionButton btnOption=prepareButtonOption(opt);
        style->drawControl(QStyle::CE_PushButton, &btnOption, painter, widget);
    }
	QSize sizeHint(const QStyleOptionViewItem &option, const QModelIndex &index) const Q_DECL_OVERRIDE{
		QStyleOptionButton btnOpt=prepareButtonOption(opt);
        const QSize fntSize = fontMetrics().size(Qt::TextShowMnemonic,btnOpt.text);
		const QWidget *widget = option.widget;
        QStyle *style = widget ? widget->style() : QApplication::style();
		return style->sizeFromContents(CT_PushButton,&btnOpt,fntSize,this);
    }
}

[JonB]

@VRonin
That is indeed a lot of code compared against the original setIndexWidget(item, new QPushButton("..."));! Makes me want to stick with that approach ;-)

[VRonin]

@JonB said in Problem while applying filter on QTableView with a button column:

Makes me want to stick with that approach

Teasing eh?! Cheeky sod!

[JonB]

@VRonin
I'm not the one who is teasing! When I discovered them I was quite happy with setIndexWidget() and whatever other methods which let you set a widget in a table etc. Simple, easy to use. Then you came along and put the fear of God into me & anyone else who chooses to use this approach, saying we would run out of memory and be damned for eternity, be kicked out of the EU, etc. ;-) So now I wouldn't dare use them....

[Lati]

@VRonin Thanks for the code! I will try to implement after few modifications.

[Lati]

@JonB Absolutely agree and disagree :) Wish filtering would work with setIndexWidget and I wouldn't loose time to implement the same thing with 100x more codes
But for static tables, I will use setIndexWidget :)

[Lati]

@VRonin It is implemented, working good. However, I have an issue. When setItemDelegateForColumn is used, all created buttons at the column have the same properties (the last row button's properties). How will I know the row number of the button I clicked?

I create the buttons as following:

ButtonDelegateTableView * addIntervalButton =
        new ButtonDelegateTableView(ui->tableView,
                                    project,
                                    wellName,
                                    rowNumber);

And, when I clicked on the button at the first row, I get the properties (well name, row number etc.) of the last row buttons.