QTableView Class Reference

The QTableView class provides a default model/view implementation of a table view. More...

 #include <QTableView>

Inherits: QAbstractItemView.

Inherited by: QTableWidget.

Properties

Public Functions

QTableView ( QWidget * parent = 0 )
~QTableView ()
void clearSpans ()
int columnAt ( int x ) const
int columnSpan ( int row, int column ) const
int columnViewportPosition ( int column ) const
int columnWidth ( int column ) const
Qt::PenStyle gridStyle () const
QHeaderView * horizontalHeader () const
bool isColumnHidden ( int column ) const
bool isCornerButtonEnabled () const
bool isRowHidden ( int row ) const
bool isSortingEnabled () const
int rowAt ( int y ) const
int rowHeight ( int row ) const
int rowSpan ( int row, int column ) const
int rowViewportPosition ( int row ) const
void setColumnHidden ( int column, bool hide )
void setColumnWidth ( int column, int width )
void setCornerButtonEnabled ( bool enable )
void setGridStyle ( Qt::PenStyle style )
void setHorizontalHeader ( QHeaderView * header )
void setRowHeight ( int row, int height )
void setRowHidden ( int row, bool hide )
void setSortingEnabled ( bool enable )
void setSpan ( int row, int column, int rowSpanCount, int columnSpanCount )
void setVerticalHeader ( QHeaderView * header )
void setWordWrap ( bool on )
bool showGrid () const
void sortByColumn ( int column, Qt::SortOrder order )
QHeaderView * verticalHeader () const
bool wordWrap () const

Reimplemented Public Functions

virtual QModelIndex indexAt ( const QPoint & pos ) const
virtual void setModel ( QAbstractItemModel * model )
virtual void setRootIndex ( const QModelIndex & index )
virtual void setSelectionModel ( QItemSelectionModel * selectionModel )

Public Slots

void hideColumn ( int column )
void hideRow ( int row )
void resizeColumnToContents ( int column )
void resizeColumnsToContents ()
void resizeRowToContents ( int row )
void resizeRowsToContents ()
void selectColumn ( int column )
void selectRow ( int row )
void setShowGrid ( bool show )
void showColumn ( int column )
void showRow ( int row )

Reimplemented Protected Functions

virtual void currentChanged ( const QModelIndex & current, const QModelIndex & previous )
virtual int horizontalOffset () const
virtual bool isIndexHidden ( const QModelIndex & index ) const
virtual QModelIndex moveCursor ( CursorAction cursorAction, Qt::KeyboardModifiers modifiers )
virtual void paintEvent ( QPaintEvent * event )
virtual QModelIndexList selectedIndexes () const
virtual void selectionChanged ( const QItemSelection & selected, const QItemSelection & deselected )
virtual void setSelection ( const QRect & rect, QItemSelectionModel::SelectionFlags flags )
virtual int sizeHintForColumn ( int column ) const
virtual int sizeHintForRow ( int row ) const
virtual void timerEvent ( QTimerEvent * event )
virtual void updateGeometries ()
virtual int verticalOffset () const
virtual QStyleOptionViewItem viewOptions () const

Protected Slots

void columnCountChanged ( int oldCount, int newCount )
void columnMoved ( int column, int oldIndex, int newIndex )
void columnResized ( int column, int oldWidth, int newWidth )
void rowCountChanged ( int oldCount, int newCount )
void rowMoved ( int row, int oldIndex, int newIndex )
void rowResized ( int row, int oldHeight, int newHeight )

Additional Inherited Members

Detailed Description

The QTableView class provides a default model/view implementation of a table view.

A QTableView implements a table view that displays items from a model. This class is used to provide standard tables that were previously provided by the QTable class, but using the more flexible approach provided by Qt's model/view architecture.

The QTableView class is one of the Model/View Classes and is part of Qt's model/view framework.

QTableView implements the interfaces defined by the QAbstractItemView class to allow it to display data provided by models derived from the QAbstractItemModel class.

Navigation

You can navigate the cells in the table by clicking on a cell with the mouse, or by using the arrow keys. Because QTableView enables tabKeyNavigation by default, you can also hit Tab and Backtab to move from cell to cell.

Visual Appearance

The table has a vertical header that can be obtained using the verticalHeader() function, and a horizontal header that is available through the horizontalHeader() function. The height of each row in the table can be found by using rowHeight(); similarly, the width of columns can be found using columnWidth(). Since both of these are plain widgets, you can hide either of them using their hide() functions.

Rows and columns can be hidden and shown with hideRow(), hideColumn(), showRow(), and showColumn(). They can be selected with selectRow() and selectColumn(). The table will show a grid depending on the showGrid property.

The items shown in a table view, like those in the other item views, are rendered and edited using standard delegates. However, for some tasks it is sometimes useful to be able to insert widgets in a table instead. Widgets are set for particular indexes with the setIndexWidget() function, and later retrieved with indexWidget().

By default, the cells in a table do not expand to fill the available space.

You can make the cells fill the available space by stretching the last header section. Access the relevant header using horizontalHeader() or verticalHeader() and set the header's stretchLastSection property.

To distribute the available space according to the space requirement of each column or row, call the view's resizeColumnsToContents() or resizeRowsToContents() functions.

Coordinate Systems

For some specialized forms of tables it is useful to be able to convert between row and column indexes and widget coordinates. The rowAt() function provides the y-coordinate within the view of the specified row; the row index can be used to obtain a corresponding y-coordinate with rowViewportPosition(). The columnAt() and columnViewportPosition() functions provide the equivalent conversion operations between x-coordinates and column indexes.

Styles

QTableView is styled appropriately for each platform. The following images show how it looks on three different platforms. Go to the Qt Widget Gallery to see its appearance in other styles.

Screenshot of a Windows XP style table viewScreenshot of a Macintosh style table viewScreenshot of a Plastique style table view
A Windows XP style table view.A Macintosh style table view.A Plastique style table view.

See also QTableWidget, View Classes, QAbstractItemModel, QAbstractItemView, Chart Example, Pixelator Example, and Table Model Example.

Property Documentation

cornerButtonEnabled : bool

This property holds whether the button in the top-left corner is enabled.

If this property is true then button in the top-left corner of the table view is enabled. Clicking on this button will select all the cells in the table view.

This property is true by default.

This property was introduced in Qt 4.3.

Access functions:

bool isCornerButtonEnabled () const
void setCornerButtonEnabled ( bool enable )

gridStyle : Qt::PenStyle

This property holds the pen style used to draw the grid.

This property holds the style used when drawing the grid (see showGrid).

Access functions:

Qt::PenStyle gridStyle () const
void setGridStyle ( Qt::PenStyle style )

showGrid : bool

This property holds whether the grid is shown.

If this property is true a grid is drawn for the table; if the property is false, no grid is drawn. The default value is true.

Access functions:

bool showGrid () const
void setShowGrid ( bool show )

sortingEnabled : bool

This property holds whether sorting is enabled.

If this property is true, sorting is enabled for the table. If this property is false, sorting is not enabled. The default value is false.

Note:. Setting the property to true with setSortingEnabled() immediately triggers a call to sortByColumn() with the current sort section and order.

This property was introduced in Qt 4.2.

Access functions:

bool isSortingEnabled () const
void setSortingEnabled ( bool enable )

See also sortByColumn().

wordWrap : bool

This property holds the item text word-wrapping policy.

If this property is true then the item text is wrapped where necessary at word-breaks; otherwise it is not wrapped at all. This property is true by default.

Note that even of wrapping is enabled, the cell will not be expanded to fit all text. Ellipsis will be inserted according to the current textElideMode.

This property was introduced in Qt 4.3.

Access functions:

bool wordWrap () const
void setWordWrap ( bool on )

Member Function Documentation

QTableView::QTableView ( QWidget * parent = 0 )

Constructs a table view with a parent to represent the data.

See also QAbstractItemModel.

QTableView::~QTableView ()

Destroys the table view.

void QTableView::clearSpans ()

Removes all row and column spans in the table view.

This function was introduced in Qt 4.4.

See also setSpan().

int QTableView::columnAt ( int x ) const

Returns the column in which the given x-coordinate, x, in contents coordinates is located.

Note: This function returns -1 if the given coordinate is not valid (has no column).

See also rowAt().

void QTableView::columnCountChanged ( int oldCount, int newCount ) [protected slot]

This slot is called whenever columns are added or deleted. The previous number of columns is specified by oldCount, and the new number of columns is specified by newCount.

void QTableView::columnMoved ( int column, int oldIndex, int newIndex ) [protected slot]

This slot is called to change the index of the given column in the table view. The old index is specified by oldIndex, and the new index by newIndex.

See also rowMoved().

void QTableView::columnResized ( int column, int oldWidth, int newWidth ) [protected slot]

This slot is called to change the width of the given column. The old width is specified by oldWidth, and the new width by newWidth.

See also rowResized().

int QTableView::columnSpan ( int row, int column ) const

Returns the column span of the table element at (row, column). The default is 1.

This function was introduced in Qt 4.2.

See also setSpan() and rowSpan().

int QTableView::columnViewportPosition ( int column ) const

Returns the x-coordinate in contents coordinates of the given column.

int QTableView::columnWidth ( int column ) const

Returns the width of the given column.

See also setColumnWidth(), resizeColumnToContents(), and rowHeight().

void QTableView::currentChanged ( const QModelIndex & current, const QModelIndex & previous ) [virtual protected]

Reimplemented from QAbstractItemView::currentChanged().

void QTableView::hideColumn ( int column ) [slot]

Hide the given column.

See also showColumn() and hideRow().

void QTableView::hideRow ( int row ) [slot]

Hide the given row.

See also showRow() and hideColumn().

QHeaderView * QTableView::horizontalHeader () const

Returns the table view's horizontal header.

See also setHorizontalHeader(), verticalHeader(), and QAbstractItemModel::headerData().

int QTableView::horizontalOffset () const [virtual protected]

Reimplemented from QAbstractItemView::horizontalOffset().

Returns the horizontal offset of the items in the table view.

Note that the table view uses the horizontal header section positions to determine the positions of columns in the view.

See also verticalOffset().

QModelIndex QTableView::indexAt ( const QPoint & pos ) const [virtual]

Reimplemented from QAbstractItemView::indexAt().

Returns the index position of the model item corresponding to the table item at position pos in contents coordinates.

bool QTableView::isColumnHidden ( int column ) const

Returns true if the given column is hidden; otherwise returns false.

See also isRowHidden().

bool QTableView::isIndexHidden ( const QModelIndex & index ) const [virtual protected]

Reimplemented from QAbstractItemView::isIndexHidden().

bool QTableView::isRowHidden ( int row ) const

Returns true if the given row is hidden; otherwise returns false.

See also isColumnHidden().

QModelIndex QTableView::moveCursor ( CursorAction cursorAction, Qt::KeyboardModifiers modifiers ) [virtual protected]

Reimplemented from QAbstractItemView::moveCursor().

Moves the cursor in accordance with the given cursorAction, using the information provided by the modifiers.

See also QAbstractItemView::CursorAction.

void QTableView::paintEvent ( QPaintEvent * event ) [virtual protected]

Reimplemented from QWidget::paintEvent().

Paints the table on receipt of the given paint event event.

void QTableView::resizeColumnToContents ( int column ) [slot]

Resizes the given column based on the size hints of the delegate used to render each item in the column.

Note: Only visible columns will be resized. Reimplement sizeHintForColumn() to resize hidden columns as well.

void QTableView::resizeColumnsToContents () [slot]

Resizes all columns based on the size hints of the delegate used to render each item in the columns.

void QTableView::resizeRowToContents ( int row ) [slot]

Resizes the given row based on the size hints of the delegate used to render each item in the row.

void QTableView::resizeRowsToContents () [slot]

Resizes all rows based on the size hints of the delegate used to render each item in the rows.

int QTableView::rowAt ( int y ) const

Returns the row in which the given y-coordinate, y, in contents coordinates is located.

Note: This function returns -1 if the given coordinate is not valid (has no row).

See also columnAt().

void QTableView::rowCountChanged ( int oldCount, int newCount ) [protected slot]

This slot is called whenever rows are added or deleted. The previous number of rows is specified by oldCount, and the new number of rows is specified by newCount.

int QTableView::rowHeight ( int row ) const

Returns the height of the given row.

See also setRowHeight(), resizeRowToContents(), and columnWidth().

void QTableView::rowMoved ( int row, int oldIndex, int newIndex ) [protected slot]

This slot is called to change the index of the given row in the table view. The old index is specified by oldIndex, and the new index by newIndex.

See also columnMoved().

void QTableView::rowResized ( int row, int oldHeight, int newHeight ) [protected slot]

This slot is called to change the height of the given row. The old height is specified by oldHeight, and the new height by newHeight.

See also columnResized().

int QTableView::rowSpan ( int row, int column ) const

Returns the row span of the table element at (row, column). The default is 1.

This function was introduced in Qt 4.2.

See also setSpan() and columnSpan().

int QTableView::rowViewportPosition ( int row ) const

Returns the y-coordinate in contents coordinates of the given row.

void QTableView::selectColumn ( int column ) [slot]

Selects the given column in the table view if the current SelectionMode and SelectionBehavior allows columns to be selected.

See also selectRow().

void QTableView::selectRow ( int row ) [slot]

Selects the given row in the table view if the current SelectionMode and SelectionBehavior allows rows to be selected.

See also selectColumn().

QModelIndexList QTableView::selectedIndexes () const [virtual protected]

Reimplemented from QAbstractItemView::selectedIndexes().

void QTableView::selectionChanged ( const QItemSelection & selected, const QItemSelection & deselected ) [virtual protected]

Reimplemented from QAbstractItemView::selectionChanged().

void QTableView::setColumnHidden ( int column, bool hide )

If hide is true the given column will be hidden; otherwise it will be shown.

See also isColumnHidden() and setRowHidden().

void QTableView::setColumnWidth ( int column, int width )

Sets the width of the given column to be width.

This function was introduced in Qt 4.1.

See also columnWidth().

void QTableView::setHorizontalHeader ( QHeaderView * header )

Sets the widget to use for the horizontal header to header.

See also horizontalHeader() and setVerticalHeader().

void QTableView::setModel ( QAbstractItemModel * model ) [virtual]

Reimplemented from QAbstractItemView::setModel().

void QTableView::setRootIndex ( const QModelIndex & index ) [virtual]

Reimplemented from QAbstractItemView::setRootIndex().

void QTableView::setRowHeight ( int row, int height )

Sets the height of the given row to be height.

This function was introduced in Qt 4.1.

See also rowHeight().

void QTableView::setRowHidden ( int row, bool hide )

If hide is true row will be hidden, otherwise it will be shown.

See also isRowHidden() and setColumnHidden().

void QTableView::setSelection ( const QRect & rect, QItemSelectionModel::SelectionFlags flags ) [virtual protected]

Reimplemented from QAbstractItemView::setSelection().

Selects the items within the given rect and in accordance with the specified selection flags.

void QTableView::setSelectionModel ( QItemSelectionModel * selectionModel ) [virtual]

Reimplemented from QAbstractItemView::setSelectionModel().

void QTableView::setSpan ( int row, int column, int rowSpanCount, int columnSpanCount )

Sets the span of the table element at (row, column) to the number of rows and columns specified by (rowSpanCount, columnSpanCount).

This function was introduced in Qt 4.2.

See also rowSpan() and columnSpan().

void QTableView::setVerticalHeader ( QHeaderView * header )

Sets the widget to use for the vertical header to header.

See also verticalHeader() and setHorizontalHeader().

void QTableView::showColumn ( int column ) [slot]

Show the given column.

See also hideColumn() and showRow().

void QTableView::showRow ( int row ) [slot]

Show the given row.

See also hideRow() and showColumn().

int QTableView::sizeHintForColumn ( int column ) const [virtual protected]

Reimplemented from QAbstractItemView::sizeHintForColumn().

Returns the size hint for the given column's width or -1 if there is no model.

If you need to set the width of a given column to a fixed value, call QHeaderView::resizeSection() on the table's horizontal header.

If you reimplement this function in a subclass, note that the value you return will be used when resizeColumnToContents() or QHeaderView::resizeSections() is called. If a larger column width is required by either the horizontal header or the item delegate, the larger width will be used instead.

See also QWidget::sizeHint and horizontalHeader().

int QTableView::sizeHintForRow ( int row ) const [virtual protected]

Reimplemented from QAbstractItemView::sizeHintForRow().

Returns the size hint for the given row's height or -1 if there is no model.

If you need to set the height of a given row to a fixed value, call QHeaderView::resizeSection() on the table's vertical header.

If you reimplement this function in a subclass, note that the value you return is only used when resizeRowToContents() is called. In that case, if a larger row height is required by either the vertical header or the item delegate, that width will be used instead.

See also QWidget::sizeHint and verticalHeader().

void QTableView::sortByColumn ( int column, Qt::SortOrder order )

Sorts the model by the values in the given column in the given order.

This function was introduced in Qt 4.2.

See also sortingEnabled.

void QTableView::timerEvent ( QTimerEvent * event ) [virtual protected]

Reimplemented from QObject::timerEvent().

void QTableView::updateGeometries () [virtual protected]

Reimplemented from QAbstractItemView::updateGeometries().

QHeaderView * QTableView::verticalHeader () const

Returns the table view's vertical header.

See also setVerticalHeader(), horizontalHeader(), and QAbstractItemModel::headerData().

int QTableView::verticalOffset () const [virtual protected]

Reimplemented from QAbstractItemView::verticalOffset().

Returns the vertical offset of the items in the table view.

Note that the table view uses the vertical header section positions to determine the positions of rows in the view.

See also horizontalOffset().

QStyleOptionViewItem QTableView::viewOptions () const [virtual protected]

Reimplemented from QAbstractItemView::viewOptions().

Notes provided by the Qt Community
Informative
  • 3

Votes: 5

Coverage: Qt library 4.8

Picture of daviddoria daviddoria

Lab Rat
6 notes

Get the selection when it changes (SelectionChanged)

It doesn’t seem clear from the documentation how to get a “selectionChanged” signal. The selectionChanged() function is protected, so how are you supposed to be notified when the selection changed and what it changed to?

This is done by connecting to the selectionChanged signal of the tableView’s selectionModel!

  1. connect(tableView->selectionModel(), SIGNAL(selectionChanged(const QItemSelection &, const QItemSelection &)), this, SLOT(slot_SelectionChanged(const QItemSelection &, const QItemSelection &)));

And then getting the selection like this:

  1. void Form::slot_SelectionChanged(const QItemSelection &, const QItemSelection &)
  2. {
  3.   QModelIndexList indexes = tableView->selectionModel()->selection().indexes();
  4.   for (int i = 0; i < indexes.count(); ++i)
  5.   {
  6.     // Output the rows of all of the selected indexes
  7.     std::cout << "selectedIndexes: " << indexes.at(i).row() << std::endl;
  8.   }
  9. }

[Revisions]

Informative
  • 0

Votes: 0

Coverage: Qt 4.8

Picture of francescmm francescmm

Hobby Entomologist
3 notes

Forcing scrollTo()

Some times, when we try to scrollTo() a position, we can see that the viewport is not refreshed. It happens that the line where we want to scroll to is outside the current visible viewport QRect. At the end of the scrollTo() method it goes into QTableView::update() that goes to QAbstractItemView due to inherit. How this method runs it is explained in QAbstractItemView notes.

As a result of this way to run, the new values ar added but not updated. To solve it it is only necessary to call two times the scrollTo() method.

[Revisions]