Qt Widgets
Model/View Tutorial
Model/View Programming
Presenting SQL Data in a Table View
Example
Star Delegate Example
Spin Box Delegate Example
Documentation / Class
QTabWidget Class
QTextTable Class
QHeaderView Class (
QAbstractTableModel Class
QAbstractItemModel Class
enum Qt::ItemDataRole
Handling Selections in Item Views
when i use “QScreen *screen = QGuiApplication::primaryScreen()” ,i get nullpt
Merge cells
QTreeView merge some cells
How to merge two cells of a qtable row?
Column/Row resize
Columns auto-resize to size of QTableView
How to update QTableView on QAbstractTableModel Change
ModelView with QTableView and QItemDelegate
Using QTableView with a model
Creating QTextTable And Inserting Data
QtextTable draw your own boarders
How to change row height in QTextTable
How to disable selection highlighting in a QTableWidget
How to set row height of QTableView?
Disable selecting row or column by clicking the header in QTableWidget
Focus Rectangle / Border Selection
Hide the border of the selected cell in qtablewidget in pyqt? (WORKS!)
How to disable selection highlighting in a QTableWidget
how to change style on a selected row
QTableWidget. Disable selection completely.
Row Height / Column Width
How to set row height of QTableView?
QTableView column width
Hide Vertical Header
How to remove the vertical header in QStandardItemModel?
Hide Column
Add QWidget or custom Painting in TableView
Adding button to QTableview
Star Delegate Example
Designing Delegates
Alignment
Centering the text of a vertical header in a QTableView?
Header
How to change the header background color of a QTableView
How to change QTableWidget header color and selection color ?
QTableView/QTableWidget grid stylesheet – grid line width
Update Model
The model emits signals to indicate changes. For example, dataChanged() is emitted whenever items of data made available by the model are changed. Changes to the headers supplied by the model cause headerDataChanged() to be emitted. If the structure of the underlying data changes, the model can emit layoutChanged() to indicate to any attached views that they should redisplay any items shown, taking the new structure into account.
How to modify the data in the model and update the view when new data is received from external?
How to update a QStringListModel
New in Qt 5.11: improvements to the model/view APIs (part 1)
How to set non-selectable default text on QComboBox?
QComboBox – Select no entry
ComboBox model change does not update graphical appearance every time
The ModelView Architecture
Source
#0 PatientModel::setData () at ../DatabaseSelect/src/business/PatientModel.cpp:188 #1 QAbstractItemModel::setItemData () at itemmodels/qabstractitemmodel.cpp:1912 #2 QComboBox::insertItem () at widgets/qcombobox.cpp:2315 #3 QComboBox::insertItem () at ../../../Qt/5.12.5/gcc_64/include/QtWidgets/qcombobox.h:279 #4 QComboBox::addItem () at ../../../Qt/5.12.5/gcc_64/include/QtWidgets/qcombobox.h:272 #5 PatientListenerComboBox::patientAdded () at ../DatabaseSelect/src/presentation/PatientListenerComboBox.cpp:18 #6 Root::addPatient () at ../DatabaseSelect/src/business/Root.cpp:15 #7 MainWindow::onPatientButtonAddClicked () at ../DatabaseSelect/src/presentation/MainWindow.cpp:164 #8 MainWindow::qt_static_metacall ()::InvokeMetaMethod, _id=3, _a=0x7fffffffd590) at moc_MainWindow.cpp:106 #9 QMetaObject::activate () #10 QMetaObject::activate ()::staticMetaObject>, #11 QAbstractButton::clicked () at .moc/moc_qabstractbutton.cpp:312 #12 QAbstractButtonPrivate::emitClicked () at widgets/qabstractbutton.cpp:414 #13 QAbstractButtonPrivate::click () at widgets/qabstractbutton.cpp:407 #14 QAbstractButton::mouseReleaseEvent () at widgets/qabstractbutton.cpp:1011 #15 QToolButton::mouseReleaseEvent () at widgets/qtoolbutton.cpp:622 #16 QWidget::event () at kernel/qwidget.cpp:9327 #17 QAbstractButton::event () at widgets/qabstractbutton.cpp:968 #18 QToolButton::event () at widgets/qtoolbutton.cpp:1001 #19 QApplicationPrivate::notify_helper () at kernel/qapplication.cpp:3700 #21 QCoreApplication::notifyInternal2 () at kernel/qcoreapplication.cpp:1088 #22 QCoreApplication::sendSpontaneousEvent () at kernel/qcoreapplication.cpp:1488 #23 QApplicationPrivate::sendMouseEvent () #24 QWidgetWindow::handleMouseEvent () at kernel/qwidgetwindow.cpp:663 #25 QWidgetWindow::event () at kernel/qwidgetwindow.cpp:281 #26 QApplicationPrivate::notify_helper () at kernel/qapplication.cpp:3700 #27 QApplication::notify () at kernel/qapplication.cpp:3446 #28 QCoreApplication::notifyInternal2 () at kernel/qcoreapplication.cpp:1088 #29 QCoreApplication::sendSpontaneousEvent () at kernel/qcoreapplication.cpp:1488 #30 QGuiApplicationPrivate::processMouseEvent () at kernel/qguiapplication.cpp:2107 #31 QGuiApplicationPrivate::processWindowSystemEvent () at kernel/qguiapplication.cpp:1842. #32 QWindowSystemInterface::sendWindowSystemEvents () at kernel/qwindowsysteminterface.cpp:1151 #33 xcbSourceDispatch () at qxcbeventdispatcher.cpp:105 #34 g_main_context_dispatch () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0 #35 ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0 #36 g_main_context_iteration () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0 #37 QEventDispatcherGlib::processEvents () at kernel/qeventdispatcher_glib.cpp:422 #38 QEventLoop::exec () at kernel/qeventloop.cpp:225 #39 QCoreApplication::exec () at kernel/qcoreapplication.cpp:1389 #40 main () at ../DatabaseSelect/src/main.cpp:55
Model
Qt/5.12.3/Src/qtbase/src/corelib/itemmodels/qabstractitemmodel.h
Qt/5.12.3/Src/qtbase/src/gui/itemmodels/qstandarditemmodel.h
class QStandardItemPrivate
{
[...]
QStandardItemModel *model;
QStandardItem *parent;
QVector<QStandardItemData> values;
QVector<QStandardItem*> children;
int rows;
int columns;
QStandardItem *q_ptr;
[...]
};
void
QStandardItemModel::setItem(int row,
int column,
QStandardItem *item)
{
Q_D(QStandardItemModel);
d->root->d_func()->setChild(row, column, item, true);
}
void
QStandardItemPrivate::setChild(int row,
int column,
QStandardItem *item,
bool emitChanged)
{
[...]
}
QVariant
QStandardItemModel::data(const QModelIndex &index,
int role) const
{
Q_D(const QStandardItemModel);
QStandardItem *item = d->itemFromIndex(index);
return item ? item->data(role) : QVariant();
}
QVariant
QStandardItem::data(int role) const
{
Q_D(const QStandardItem);
role = (role == Qt::EditRole) ? Qt::DisplayRole : role;
QVector<QStandardItemData>::const_iterator it;
for (it = d->values.begin(); it != d->values.end(); ++it) {
if ((*it).role == role)
return (*it).value;
}
return QVariant();
}
void
QStandardItem::setRowCount(int rows)
{
int rc = rowCount();
if (rc == rows)
return;
if (rc < rows)
insertRows(qMax(rc, 0), rows - rc);
else
removeRows(qMax(rows, 0), rc - rows);
}
void
QStandardItem::insertRows(int row,
const QList<QStandardItem*> &items)
{
Q_D(QStandardItem);
if (row < 0)
return;
d->insertRows(row, items);
}
bool
QStandardItemPrivate::insertRows(int row,
int count,
const QList<QStandardItem*> &items)
{
[...]
if (model)
model->d_func()->rowsAboutToBeInserted(q, row, row + count - 1);
[...]
if (model)
model->d_func()->rowsInserted(q, row, count);
return true;
}
View
Qt/5.12.3/Src/qtbase/src/widgets/widgets/qcombobox.h
Qt/5.12.5/Src/qtbase/src/widgets/itemviews/qabstractitemview.h
/*!
This slot is called when items with the given \a roles are changed in the
model. The changed items are those from \a topLeft to \a bottomRight
inclusive. If just one item is changed \a topLeft == \a bottomRight.
The \a roles which have been changed can either be an empty container (meaning everything
has changed), or a non-empty container with the subset of roles which have changed.
*/
void QAbstractItemView::dataChanged(const QModelIndex &topLeft, const QModelIndex &bottomRight, const QVector<int> &roles)
{
[...]
}
Qt/5.12.5/Src/qtbase/src/widgets/itemviews/qtreeview.h
/*!
\reimp
*/
void QTreeView::dataChanged(const QModelIndex &topLeft, const QModelIndex &bottomRight, const QVector<int> &roles)
{
[...]
QAbstractItemView::dataChanged(topLeft, bottomRight, roles);
}