Details
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Bug
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Resolution: Won't Do
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P2: Important
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None
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4.7.4, 5.9.4, 5.13.0
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None
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Ubuntu 16.04 x86_64
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Linux/X11
Description
Description
I'm trying to implement a QTableView where the first column is spanned to all rows. I also want the text data to be visible regardless of the vertical scroll applied to the view.
Here is the view after starting the application
Expected
After scrolling down
Actual
The text is only drawn correctly after the application loses focus, which leads me to believe this is a bug. I've tested with the listed Qt versions and each result in slightly different incorrect behavior.
Source files
main.cpp
#include <QApplication>
#include <QTableView>
#include "mymodel.h"
#include "mydelegate.h"
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
QTableView tableView;
MyModel myModel;
MyDelegate myDelegate;
tableView.setModel(&myModel);
tableView.setItemDelegate(&myDelegate);
tableView.setSpan(0, 0, 20, 1);
tableView.show();
return a.exec();
}
mydelegate.cpp
#include "mydelegate.h"
void MyDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const
{
if (index.column() == 0) {
QStyleOptionViewItem myOption = option;
myOption.displayAlignment = Qt::AlignLeft | Qt::AlignTop;
myOption.rect.setRect(0, 0, myOption.rect.width(), myOption.rect.height());
QStyledItemDelegate::paint(painter, myOption, index);
}
else {
QStyledItemDelegate::paint(painter, option, index);
}
}
mydelegate.h
#pragma once
#include <QStyledItemDelegate>
class MyDelegate : public QStyledItemDelegate
{
Q_OBJECT
public:
using QStyledItemDelegate::QStyledItemDelegate;
void paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const;
};
mymodel.cpp
#include "mymodel.h"
int MyModel::rowCount(const QModelIndex & /*parent*/) const
{
return 20;
}
int MyModel::columnCount(const QModelIndex & /*parent*/) const
{
return 20;
}
QVariant MyModel::data(const QModelIndex &index, int role) const
{
if (role == Qt::DisplayRole)
{
return QString("Row %1, Column %2")
.arg(index.row() + 1)
.arg(index.column() + 1);
}
return QVariant();
}
mymodel.h
#pragma once
#include <QAbstractTableModel>
class MyModel : public QAbstractTableModel
{
Q_OBJECT
public:
using QAbstractTableModel::QAbstractTableModel;
int rowCount(const QModelIndex &parent = QModelIndex()) const ;
int columnCount(const QModelIndex &parent = QModelIndex()) const;
QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const;
};
qt-test.pro
TARGET = qt-test
TEMPLATE = app
QT += widgets
QMAKE_LFLAGS += -Wl,-rpath,$$(QT_INSTALL_PREFIX)/lib
SOURCES += main.cpp \
mymodel.cpp \
mydelegate.cpp
HEADERS += mymodel.h \
mydelegate.h
