Detailed Description
The QListBox widget provides a list of selectable, read-only items.
This is typically a single-column list in which either no item or
one item is selected, but it can also be used in many other ways.
QListBox will add scroll bars as necessary, but it isn't intended
for really big lists. If you want more than a few thousand
items, it's probably better to use a different widget mainly
because the scroll bars won't provide very good navigation, but
also because QListBox may become slow with huge lists. (See
QListView and QTable for possible alternatives.)
There are a variety of selection modes described in the
QListBox::SelectionMode documentation. The default is Single
selection mode, but you can change it using setSelectionMode().
(setMultiSelection() is still provided for compatibility with Qt
1.x. We recommend using setSelectionMode() in all code.)
Because QListBox offers multiple selection it must display
keyboard focus and selection state separately. Therefore there are
functions both to set the selection state of an item, i.e.
setSelected(), and to set which item displays keyboard focus, i.e.
setCurrentItem().
The list box normally arranges its items in a single column and
adds a vertical scroll bar if required. It is possible to have a
different fixed number of columns (setColumnMode()), or as many
columns as will fit in the list box's assigned screen space
(setColumnMode(FitToWidth)), or to have a fixed number of rows
(setRowMode()) or as many rows as will fit in the list box's
assigned screen space (setRowMode(FitToHeight)). In all these
cases QListBox will add scroll bars, as appropriate, in at least
one direction.
If multiple rows are used, each row can be as high as necessary
(the normal setting), or you can request that all items will have
the same height by calling setVariableHeight(FALSE). The same
applies to a column's width, see setVariableWidth().
The QListBox's items are QListBoxItem objects. QListBox provides
methods to insert new items as strings, as pixmaps, and as
QListBoxItem * (insertItem() with various arguments), and to
replace an existing item with a new string, pixmap or QListBoxItem
(changeItem() with various arguments). You can also remove items
singly with removeItem() or clear() the entire list box. Note that
if you create a QListBoxItem yourself and insert it, QListBox
takes ownership of the item.
You can also create a QListBoxItem, such as QListBoxText or
QListBoxPixmap, with the list box as first parameter. The item
will then append itself. When you delete an item it is
automatically removed from the list box.
The list of items can be arbitrarily large; QListBox will add
scroll bars if necessary. QListBox can display a single-column
(the common case) or multiple-columns, and offers both single and
multiple selection. QListBox does not support multiple-column
items (but QListView and QTable do), or tree hierarchies (but
QListView does).
The list box items can be accessed both as QListBoxItem objects
(recommended) and using integer indexes (the original QListBox
implementation used an array of strings internally, and the API
still supports this mode of operation). Everything can be done
using the new objects, and most things can be done using indexes.
Each item in a QListBox contains a QListBoxItem. One of the items
can be the current item. The currentChanged() signal and the
highlighted() signal are emitted when a new item becomes current,
e.g. because the user clicks on it or QListBox::setCurrentItem()
is called. The selected() signal is emitted when the user
double-clicks on an item or presses Enter on the current item.
If the user does not select anything, no signals are emitted and
currentItem() returns -1.
A list box has WheelFocus as a default focusPolicy(), i.e. it
can get keyboard focus by tabbing, clicking and through the use of
the mouse wheel.
New items can be inserted using insertItem(), insertStrList() or
insertStringList(). inSort() is obsolete because this method is
quite inefficient. It's preferable to insert the items normally
and call sort() afterwards, or to insert a sorted QStringList().
By default, vertical and horizontal scroll bars are added and
removed as necessary. setHScrollBarMode() and setVScrollBarMode()
can be used to change this policy.
If you need to insert types other than strings and pixmaps, you
must define new classes which inherit QListBoxItem.
Warning: The list box assumes ownership of all list box items and
will delete them when it does not need them any more.
See also QListView, QComboBox, QButtonGroup, GUI Design Handbook: List Box (two
sections), and Advanced Widgets.
Member Type Documentation
QListBox::LayoutMode
This enum type is used to specify how QListBox lays out its rows
and columns.
- QListBox::FixedNumber - There is a fixed number of rows (or columns).
- QListBox::FitToWidth - There are as many columns as will fit
on-screen.
- QListBox::FitToHeight - There are as many rows as will fit on-screen.
- QListBox::Variable - There are as many rows as are required by the
column mode. (Or as many columns as required by the row mode.)
Example: When you call setRowMode( FitToHeight ), columnMode()
automatically becomes Variable to accommodate the row mode
you've set.
QListBox::SelectionMode
This enumerated type is used by QListBox to indicate how it reacts
to selection by the user.
- QListBox::Single - When the user selects an item, any already-selected
item becomes unselected and the user cannot unselect the selected
item. This means that the user can never clear the selection, even
though the selection may be cleared by the application programmer
using QListBox::clearSelection().
- QListBox::Multi - When the user selects an item the selection status
of that item is toggled and the other items are left alone. Also,
multiple items can be selected by dragging the mouse while the
left mouse button is kept pressed.
- QListBox::Extended - When the user selects an item the selection is
cleared and the new item selected. However, if the user presses
the Ctrl key when clicking on an item, the clicked item gets
toggled and all other items are left untouched. And if the user
presses the Shift key while clicking on an item, all items between
the current item and the clicked item get selected or unselected,
depending on the state of the clicked item. Also, multiple items
can be selected by dragging the mouse while the left mouse button
is kept pressed.
- QListBox::NoSelection - Items cannot be selected.
In other words, Single is a real single-selection list box, Multi is a real multi-selection list box, Extended is a list
box in which users can select multiple items but usually want to
select either just one or a range of contiguous items, and NoSelection is for a list box where the user can look but not
touch.
Member Function Documentation
QListBox::QListBox ( QWidget * parent = 0, const char * name = 0, WFlags f = 0 )
Constructs a new empty list box called name and with parent parent.
Performance is boosted by modifying the widget flags f so that
only part of the QListBoxItem children is redrawn. This may be
unsuitable for custom QListBoxItem classes, in which case WStaticContents and WNoAutoErase should be cleared
immediately after construction.
See also QWidget::clearWFlags() and Qt::WidgetFlags.
QListBox::~QListBox ()
Destroys the list box. Deletes all list box items.
bool QListBox::autoBottomScrollBar () const
This function is obsolete. It is provided to keep old source working. We strongly advise against using it in new code.
Returns TRUE if hScrollBarMode() is Auto; otherwise returns
FALSE.
bool QListBox::autoScrollBar () const
This function is obsolete. It is provided to keep old source working. We strongly advise against using it in new code.
Returns TRUE if vScrollBarMode() is Auto; otherwise returns
FALSE.
bool QListBox::bottomScrollBar () const
This function is obsolete. It is provided to keep old source working. We strongly advise against using it in new code.
Returns FALSE if vScrollBarMode() is AlwaysOff; otherwise
returns TRUE.
int QListBox::cellHeight ( int i ) const
This function is obsolete. It is provided to keep old source working. We strongly advise against using it in new code.
Returns the item height of item i.
See also itemHeight().
int QListBox::cellHeight () const
This function is obsolete. It is provided to keep old source working. We strongly advise against using it in new code.
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
Returns the item height of the first item, item 0.
See also itemHeight().
int QListBox::cellWidth () const
This function is obsolete. It is provided to keep old source working. We strongly advise against using it in new code.
Returns the maximum item width.
See also maxItemWidth().
void QListBox::centerCurrentItem ()
This function is obsolete. It is provided to keep old source working. We strongly advise against using it in new code.
This function does exactly the same as ensureCurrentVisible()
See also QListBox::ensureCurrentVisible().
void QListBox::changeItem ( const QListBoxItem * lbi, int index )
Replaces the item at position index with lbi. If index is
negative or too large, changeItem() does nothing.
The item that has been changed will become selected.
See also insertItem() and removeItem().
void QListBox::changeItem ( const QString & text, int index )
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
Replaces the item at position index with a new list box text
item with text text.
The operation is ignored if index is out of range.
See also insertItem() and removeItem().
void QListBox::changeItem ( const QPixmap & pixmap, int index )
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
Replaces the item at position index with a new list box pixmap
item with pixmap pixmap.
The operation is ignored if index is out of range.
See also insertItem() and removeItem().
void QListBox::changeItem ( const QPixmap & pixmap, const QString & text, int index )
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
Replaces the item at position index with a new list box pixmap
item with pixmap pixmap and text text.
The operation is ignored if index is out of range.
See also insertItem() and removeItem().
void QListBox::clear () [slot]
Deletes all the items in the list.
See also removeItem().
void QListBox::clearSelection () [virtual slot]
Deselects all items, if possible.
Note that a Single selection list box will automatically select
an item if it has keyboard focus.
Example: listbox/listbox.cpp.
void QListBox::clicked ( QListBoxItem * item ) [signal]
This signal is emitted when the user clicks any mouse button. If
item is not 0, the cursor is on item. If item is 0, the
mouse cursor isn't on any item.
Note that you must not delete any QListBoxItem objects in slots
connected to this signal.
void QListBox::clicked ( QListBoxItem * item, const QPoint & pnt ) [signal]
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
This signal is emitted when the user clicks any mouse button. If
item is not 0, the cursor is on item. If item is 0, the
mouse cursor isn't on any item.
pnt is the position of the mouse cursor in the global
coordinate system (QMouseEvent::globalPos()). (If the click's
press and release differs by a pixel or two, pnt is the
position at release time.)
Note that you must not delete any QListBoxItem objects in slots
connected to this signal.
LayoutMode QListBox::columnMode () const
Returns the column layout mode for this list box.
See the "columnMode" property for details.
void
This signal is emitted when the user invokes a context menu with
the right mouse button or with special system keys, with item
being the item under the mouse cursor or the current item,
respectively.
pos is the position for the context menu in the global
coordinate system.
uint QListBox::count () const
Returns the number of items in the list box.
See the "count" property for details.
void QListBox::currentChanged ( QListBoxItem * item ) [signal]
This signal is emitted when the user makes a new item the current
item. item is the new current list box item.
See also currentItem and currentItem.
int QListBox::currentItem () const
Returns the current highlighted item.
See the "currentItem" property for details.
QString QListBox::currentText () const
Returns the text of the current item.
See the "currentText" property for details.
void QListBox::doLayout () const [protected]
This function does the hard layout work. You should never need to
call it.
void QListBox::doubleClicked ( QListBoxItem * item ) [signal]
This signal is emitted whenever an item is double-clicked. It's
emitted on the second button press, not the second button release.
If item is not 0, the cursor is on item. If item is 0,
the mouse cursor isn't on any item.
void QListBox::ensureCurrentVisible () [virtual slot]
Ensures that the current item is visible.
QListBoxItem * QListBox::findItem ( const QString & text, ComparisonFlags compare = BeginsWith ) const
Finds the first list box item that has the text text and
returns it, or returns 0 of no such item could be found.
The search starts from the current item if the current item exists,
otherwise it starts from the first list box item.
If ComparisonFlags are specified in compare then these flags
are used, otherwise the default is a case-insensitive, "begins
with" search.
See also Qt::StringComparisonMode.
int QListBox::findItem ( int yPos ) const [protected]
This function is obsolete. It is provided to keep old source working. We strongly advise against using it in new code.
Returns the index of the item a point (0, yPos).
See also index() and itemAt().
QListBoxItem * QListBox::firstItem () const
Returns the first item in this list box. If the list box is empty,
returns 0.
void QListBox::highlighted ( int index ) [signal]
This signal is emitted when the user makes a new item the current
item. index is the index of the new current item.
See also currentChanged(), selected(), currentItem, and selectionChanged().
void QListBox::highlighted ( const QString & ) [signal]
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
This signal is emitted when the user makes a new item the current
item and the item is (or has) a string. The argument is the text
of the new current item.
See also currentChanged(), selected(), currentItem, and selectionChanged().
void QListBox::highlighted ( QListBoxItem * ) [signal]
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
This signal is emitted when the user makes a new item the current
item. The argument is a pointer to the new current item.
See also currentChanged(), selected(), currentItem, and selectionChanged().
int QListBox::inSort ( const QListBoxItem * lbi )
This function is obsolete. It is provided to keep old source working. We strongly advise against using it in new code.
Using this method is quite inefficient. We suggest to use insertItem()
for inserting and sort() afterwards.
Inserts lbi at its sorted position in the list box and returns the
position.
All items must be inserted with inSort() to maintain the sorting
order. inSort() treats any pixmap (or user-defined type) as
lexicographically less than any string.
See also insertItem() and sort().
int QListBox::inSort ( const QString & text )
This function is obsolete. It is provided to keep old source working. We strongly advise against using it in new code.
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
Using this method is quite inefficient. We suggest to use insertItem()
for inserting and sort() afterwards.
Inserts a new item of text at its sorted position in the list box and
returns the position.
All items must be inserted with inSort() to maintain the sorting
order. inSort() treats any pixmap (or user-defined type) as
lexicographically less than any string.
See also insertItem() and sort().
int QListBox::index ( const QListBoxItem * lbi ) const
Returns the index of lbi, or -1 if the item is not in this list
box or lbi is 0.
See also item().
void QListBox::insertItem ( const QListBoxItem * lbi, int index = -1 )
Inserts the item lbi into the list at position index.
If index is negative or larger than the number of items in the
list box, lbi is inserted at the end of the list.
See also insertStrList().
Examples: i18n/mywidget.cpp, listbox/listbox.cpp, listboxcombo/listboxcombo.cpp, and tabdialog/tabdialog.cpp.
void QListBox::insertItem ( const QListBoxItem * lbi, const QListBoxItem * after )
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
Inserts the item lbi into the list after the item after, or
at the beginning if after is 0.
See also insertStrList().
void QListBox::insertItem ( const QString & text, int index = -1 )
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
Inserts a new list box text item with the text text into the
list at position index.
If index is negative, text is inserted at the end of the
list.
See also insertStrList().
void QListBox::insertItem ( const QPixmap & pixmap, int index = -1 )
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
Inserts a new list box pixmap item with the pixmap pixmap into
the list at position index.
If index is negative, pixmap is inserted at the end of the
list.
See also insertStrList().
void QListBox::insertItem ( const QPixmap & pixmap, const QString & text, int index = -1 )
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
Inserts a new list box pixmap item with the pixmap pixmap and
the text text into the list at position index.
If index is negative, pixmap is inserted at the end of the
list.
See also insertStrList().
void QListBox::insertStrList ( const QStrList * list, int index = -1 )
Inserts the string list list into the list at position index.
If index is negative, list is inserted at the end of the
list. If index is too large, the operation is ignored.
Warning: This function uses const char * rather than QString,
so we recommend against using it. It is provided so that legacy
code will continue to work, and so that programs that certainly
will not need to handle code outside a single 8-bit locale can use
it. See insertStringList() which uses real QStrings.
Warning: This function is never significantly faster than a loop
around insertItem().
See also insertItem() and insertStringList().
void QListBox::insertStrList ( const QStrList & list, int index = -1 )
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
Inserts the string list list into the list at position index.
If index is negative, list is inserted at the end of the
list. If index is too large, the operation is ignored.
Warning: This function uses const char * rather than QString,
so we recommend against using it. It is provided so that legacy
code will continue to work, and so that programs that certainly
will not need to handle code outside a single 8-bit locale can use
it. See insertStringList() which uses real QStrings.
Warning: This function is never significantly faster than a loop
around insertItem().
See also insertItem() and insertStringList().
void QListBox::insertStrList ( const char ** strings, int numStrings = -1, int index = -1 )
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
Inserts the numStrings strings of the array strings into the
list at position index.
If index is negative, insertStrList() inserts strings at the
end of the list. If index is too large, the operation is
ignored.
Warning: This function uses const char * rather than QString,
so we recommend against using it. It is provided so that legacy
code will continue to work, and so that programs that certainly
will not need to handle code outside a single 8-bit locale can use
it. See insertStringList() which uses real QStrings.
Warning: This function is never significantly faster than a loop
around insertItem().
See also insertItem() and insertStringList().
void QListBox::insertStringList ( const QStringList & list, int index = -1 )
Inserts the string list list into the list at position index.
If index is negative, list is inserted at the end of the
list. If index is too large, the operation is ignored.
Warning: This function is never significantly faster than a loop
around insertItem().
See also insertItem() and insertStrList().
void QListBox::invertSelection () [virtual slot]
Inverts the selection. Only works in Multi and Extended
selection mode.
bool QListBox::isMultiSelection () const
Returns TRUE if or not the list box is in Multi selection mode; otherwise returns FALSE.
See the "multiSelection" property for details.
bool QListBox::isRubberSelecting () const [protected]
Returns TRUE if the user is selecting items using a rubber band
rectangle; otherwise returns FALSE.
bool QListBox::isSelected ( int i ) const
Returns TRUE if item i is selected; otherwise returns FALSE.
bool QListBox::isSelected ( const QListBoxItem * i ) const
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
Returns TRUE if item i is selected; otherwise returns FALSE.
QListBoxItem * QListBox::item ( int index ) const
Returns a pointer to the item at position index, or 0 if index is out of bounds.
See also index().
Example: listboxcombo/listboxcombo.cpp.
QListBoxItem * QListBox::itemAt ( const QPoint & p ) const
Returns the item at point p, specified in viewport coordinates,
or a 0 if there is no item at p.
Use contentsToViewport() to convert between widget coordinates and
viewport coordinates.
int QListBox::itemHeight ( int index = 0 ) const
Returns the height in pixels of the item with index index. index defaults to 0.
If index is too large, this function returns 0.
QRect QListBox::itemRect ( QListBoxItem * item ) const
Returns the rectangle on the screen that item occupies in
viewport()'s coordinates, or an invalid rectangle if item is 0
or is not currently visible.
bool QListBox::itemVisible ( int index )
Returns TRUE if the item at position index is at least partly
visible; otherwise returns FALSE.
bool QListBox::itemVisible ( const QListBoxItem * item )
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
Returns TRUE if item is at least partly visible; otherwise
returns FALSE.
bool QListBox::itemYPos ( int index, int * yPos ) const [protected]
This function is obsolete. It is provided to keep old source working. We strongly advise against using it in new code.
Returns the vertical pixel-coordinate in *yPos, of the list box
item at position index in the list. Returns FALSE if the item is
outside the visible area.
long QListBox::maxItemWidth () const
Returns the width of the widest item in the list box.
void QListBox::mouseButtonClicked ( int button, QListBoxItem * item, const QPoint & pos ) [signal]
This signal is emitted when the user clicks mouse button button. If item is not 0, the cursor is on item. If item
is 0, the mouse cursor isn't on any item.
pos is the position of the mouse cursor in the global
coordinate system (QMouseEvent::globalPos()). (If the click's
press and release differs by a pixel or two, pos is the
position at release time.)
Note that you must not delete any QListBoxItem objects in slots
connected to this signal.
void QListBox::mouseButtonPressed ( int button, QListBoxItem * item, const QPoint & pos ) [signal]
This signal is emitted when the user presses mouse button button. If item is not 0, the cursor is on item. If item
is 0, the mouse cursor isn't on any item.
pos is the position of the mouse cursor in the global
coordinate system (QMouseEvent::globalPos()).
Note that you must not delete any QListBoxItem objects in slots
connected to this signal.
int QListBox::numCols () const
This function is obsolete. It is provided to keep old source working. We strongly advise against using it in new code.
Returns the number of columns.
See also numColumns.
int QListBox::numColumns () const
Returns the number of columns in the list box.
See the "numColumns" property for details.
int QListBox::numItemsVisible () const
Returns the number of visible items.
See the "numItemsVisible" property for details.
int QListBox::numRows () const
Returns the number of rows in the list box.
See the "numRows" property for details.
void QListBox::onItem ( QListBoxItem * i ) [signal]
This signal is emitted when the user moves the mouse cursor onto
an item, similar to the QWidget::enterEvent() function. i is
the QListBoxItem that the mouse has moved on.
void QListBox::onViewport () [signal]
This signal is emitted when the user moves the mouse cursor from
an item to an empty part of the list box.
void QListBox::paintCell ( QPainter * p, int row, int col ) [virtual protected]
Provided for compatibility with the old QListBox. We recommend
using QListBoxItem::paint() instead.
Repaints the cell at row, col using painter p.
const QPixmap * QListBox::pixmap ( int index ) const
Returns a pointer to the pixmap at position index, or 0 if
there is no pixmap there.
See also text().
void QListBox::pressed ( QListBoxItem * item ) [signal]
This signal is emitted when the user presses any mouse button. If
item is not 0, the cursor is on item. If item is 0, the
mouse cursor isn't on any item.
Note that you must not delete any QListBoxItem objects in slots
connected to this signal.
void QListBox::pressed ( QListBoxItem * item, const QPoint & pnt ) [signal]
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
This signal is emitted when the user presses any mouse button. If
item is not 0, the cursor is on item. If item is 0, the
mouse cursor isn't on any item.
pnt is the position of the mouse cursor in the global
coordinate system (QMouseEvent::globalPos()).
Note that you must not delete any QListBoxItem objects in slots
connected to this signal.
See also mouseButtonPressed(), rightButtonPressed(), and clicked().
void QListBox::removeItem ( int index )
Removes and deletes the item at position index. If index is
equal to currentItem(), a new item becomes current and the
currentChanged() and highlighted() signals are emitted.
See also insertItem() and clear().
void QListBox::returnPressed ( QListBoxItem * ) [signal]
This signal is emitted when Enter or Return is pressed. The
argument is currentItem().
void QListBox::rightButtonClicked ( QListBoxItem *, const QPoint & ) [signal]
This signal is emitted when the right button is clicked (i.e. when
it's released at the same point where it was pressed). The
arguments are the relevant QListBoxItem (may be 0) and the point
in global coordinates.
void QListBox::rightButtonPressed ( QListBoxItem *, const QPoint & ) [signal]
This signal is emitted when the right button is pressed. The
arguments are the relevant QListBoxItem (may be 0) and the point
in global coordinates.
LayoutMode QListBox::rowMode () const
Returns the row layout mode for this list box.
See the "rowMode" property for details.
bool QListBox::scrollBar () const
This function is obsolete. It is provided to keep old source working. We strongly advise against using it in new code.
Returns FALSE if vScrollBarMode() is AlwaysOff; otherwise
returns TRUE.
void QListBox::selectAll ( bool select ) [virtual slot]
In Multi and Extended modes, this function sets all items to
be selected if select is TRUE, and to be unselected if select is FALSE.
In Single and NoSelection modes, this function only changes
the selection status of currentItem().
void QListBox::selected ( int index ) [signal]
This signal is emitted when the user double-clicks on an item or
presses Enter on the current item. index is the index of the
selected item.
See also currentChanged(), highlighted(), and selectionChanged().
void QListBox::selected ( const QString & ) [signal]
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
This signal is emitted when the user double-clicks on an item or
presses Enter on the current item, and the item is (or has) a
string. The argument is the text of the selected item.
See also currentChanged(), highlighted(), and selectionChanged().
void QListBox::selected ( QListBoxItem * ) [signal]
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
This signal is emitted when the user double-clicks on an item or
presses Enter on the current item. The argument is a pointer to
the new selected item.
See also currentChanged(), highlighted(), and selectionChanged().
QListBoxItem * QListBox::selectedItem () const
Returns the selected item if the list box is in
single-selection mode and an item is selected.
If no items are selected or the list box is in another selection mode
this function returns 0.
See also setSelected() and multiSelection.
void QListBox::selectionChanged () [signal]
This signal is emitted when the selection set of a list box
changes. This signal is emitted in each selection mode. If the
user selects five items by drag-selecting, QListBox tries to emit
just one selectionChanged() signal so the signal can be connected
to computationally expensive slots.
See also selected() and currentItem.
void QListBox::selectionChanged ( QListBoxItem * item ) [signal]
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
This signal is emitted when the selection in a Single selection
list box changes. item is the newly selected list box item.
See also selected() and currentItem.
SelectionMode QListBox::selectionMode () const
Returns the selection mode of the list box.
See the "selectionMode" property for details.
void QListBox::setAutoBottomScrollBar ( bool enable )
This function is obsolete. It is provided to keep old source working. We strongly advise against using it in new code.
If enable is TRUE sets setHScrollBarMode() to AlwaysOn;
otherwise sets setHScrollBarMode() to AlwaysOff.
void QListBox::setAutoScrollBar ( bool enable )
This function is obsolete. It is provided to keep old source working. We strongly advise against using it in new code.
If enable is TRUE sets setVScrollBarMode() to AlwaysOn;
otherwise sets setVScrollBarMode() to AlwaysOff.
void QListBox::setBottomItem ( int index ) [virtual]
Scrolls the list box so the item at position index in the list
is displayed in the bottom row of the list box.
See also topItem.
void QListBox::setBottomScrollBar ( bool enable )
This function is obsolete. It is provided to keep old source working. We strongly advise against using it in new code.
If enable is TRUE sets setHScrollBarMode() to AlwaysOn;
otherwise sets setHScrollBarMode() to AlwaysOff.
void QListBox::setColumnMode ( LayoutMode ) [virtual]
Sets the column layout mode for this list box.
See the "columnMode" property for details.
void QListBox::setColumnMode ( int ) [virtual]
Sets the column layout mode for this list box.
See the "columnMode" property for details.
void QListBox::setCurrentItem ( int index ) [virtual]
Sets the current highlighted item to index.
See the "currentItem" property for details.
void QListBox::setCurrentItem ( QListBoxItem * i ) [virtual]
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
Sets the current item to the QListBoxItem i.
void QListBox::setMultiSelection ( bool multi )
Sets whether or not the list box is in Multi selection mode to multi.
See the "multiSelection" property for details.
void QListBox::setRowMode ( LayoutMode ) [virtual]
Sets the row layout mode for this list box.
See the "rowMode" property for details.
void QListBox::setRowMode ( int ) [virtual]
Sets the row layout mode for this list box.
See the "rowMode" property for details.
void QListBox::setScrollBar ( bool enable )
This function is obsolete. It is provided to keep old source working. We strongly advise against using it in new code.
If enable is TRUE sets setVScrollBarMode() to AlwaysOn;
otherwise sets setVScrollBarMode() to AlwaysOff.
void QListBox::setSelected ( QListBoxItem * item, bool select ) [virtual]
Selects item if select is TRUE or unselects it if select
is FALSE, and repaints the item appropriately.
If the list box is a Single selection list box and select is
TRUE, setSelected() calls setCurrentItem().
If the list box is a Single selection list box, select is
FALSE, setSelected() calls clearSelection().
See also multiSelection, currentItem, clearSelection(), and currentItem.
void QListBox::setSelected ( int index, bool select )
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
If select is TRUE the item at position index is selected;
otherwise the item is deselected.
void QListBox::setSelectionMode ( SelectionMode ) [virtual]
Sets the selection mode of the list box.
See the "selectionMode" property for details.
void QListBox::setTopItem ( int index ) [virtual]
Sets the index of an item at the top of the screen to index.
See the "topItem" property for details.
void QListBox::setVariableHeight ( bool ) [virtual]
Sets whether this list box has variable-height rows.
See the "variableHeight" property for details.
void QListBox::setVariableWidth ( bool ) [virtual]
Sets whether this list box has variable-width columns.
See the "variableWidth" property for details.
void QListBox::sort ( bool ascending = TRUE )
If ascending is TRUE sorts the items in ascending order;
otherwise sorts in descending order.
To compare the items, the text (QListBoxItem::text()) of the items
is used.
Example: listbox/listbox.cpp.
void QListBox::takeItem ( const QListBoxItem * item )
Removes item from the list box and causes an update of the
screen display. The item is not deleted. You should normally not
need to call this function because QListBoxItem::~QListBoxItem()
calls it. The normal way to delete an item is with delete.
See also QListBox::insertItem().
QString QListBox::text ( int index ) const
Returns the text at position index, or QString::null if there
is no text at that position.
See also pixmap().
void QListBox::toggleCurrentItem () [protected]
Toggles the selection status of currentItem() and repaints if the
list box is a Multi selection list box.
See also multiSelection.
int QListBox::topItem () const
Returns the index of an item at the top of the screen.
See the "topItem" property for details.
int QListBox::totalHeight () const [protected]
This function is obsolete. It is provided to keep old source working. We strongly advise against using it in new code.
Returns contentsHeight().
int QListBox::totalWidth () const [protected]
This function is obsolete. It is provided to keep old source working. We strongly advise against using it in new code.
Returns contentsWidth().
void QListBox::triggerUpdate ( bool doLayout )
Ensures that a single paint event will occur at the end of the
current event loop iteration. If doLayout is TRUE, the layout
is also redone.
void QListBox::updateItem ( int index ) [protected]
Repaints the item at position index in the list.
void QListBox::updateItem ( QListBoxItem * i ) [protected]
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
Repaints the QListBoxItem i.
bool QListBox::variableHeight () const
Returns TRUE if this list box has variable-height rows; otherwise returns FALSE.
See the "variableHeight" property for details.
bool QListBox::variableWidth () const
Returns TRUE if this list box has variable-width columns; otherwise returns FALSE.
See the "variableWidth" property for details.
Property Documentation
This property holds the column layout mode for this list box.
setColumnMode() sets the layout mode and adjusts the number of
displayed columns. The row layout mode automatically becomes Variable, unless the column mode is Variable.
See also rowMode, rowMode, and numColumns.
Set this property's value with setColumnMode() and get this property's value with columnMode().
uint count
This property holds the number of items in the list box.
Get this property's value with count().
int currentItem
This property holds the current highlighted item.
When setting this property, the highlighting is moved to the item
and the list box scrolled as necessary.
If no item is current, currentItem() returns -1.
Set this property's value with setCurrentItem() and get this property's value with currentItem().
This property holds the text of the current item.
This is equivalent to text(currentItem()).
Get this property's value with currentText().
bool multiSelection
This function is obsolete. It is provided to keep old source working. We strongly advise against using it in new code.
This property holds whether or not the list box is in Multi selection mode.
Consider using the QListBox::selectionMode property instead of
this property.
When setting this property, Multi selection mode is used if set to TRUE and
to Single selection mode if set to FALSE.
When getting this property, TRUE is returned if the list box is in
Multi selection mode or Extended selection mode, and FALSE if it is
in Single selection mode or NoSelection mode.
See also selectionMode.
Set this property's value with setMultiSelection() and get this property's value with isMultiSelection().
int numColumns
This property holds the number of columns in the list box.
This is normally 1, but can be different if QListBox::columnMode or QListBox::rowMode has been set.
See also columnMode, rowMode, and numRows.
Get this property's value with numColumns().
int numItemsVisible
This property holds the number of visible items.
Both partially and entirely visible items are counted.
Get this property's value with numItemsVisible().
int numRows
This property holds the number of rows in the list box.
This is equal to the number of items in the default single-column
layout, but can be different.
See also columnMode, rowMode, and numColumns.
Get this property's value with numRows().
This property holds the row layout mode for this list box.
This property is normally Variable.
setRowMode() sets the layout mode and adjusts the number of
displayed rows. The column layout mode automatically becomes Variable, unless the row mode is Variable.
See also columnMode.
Set this property's value with setRowMode() and get this property's value with rowMode().
This property holds the selection mode of the list box.
Sets the list box's selection mode, which may be one of Single
(the default), Extended, Multi or NoSelection.
See also SelectionMode.
Set this property's value with setSelectionMode() and get this property's value with selectionMode().
int topItem
This property holds the index of an item at the top of the screen.
When getting this property and the listbox has multiple columns,
an arbitrary item is selected and returned.
When setting this property, the list box is scrolled so the item
at position index in the list is displayed in the top row of
the list box.
Set this property's value with setTopItem() and get this property's value with topItem().
bool variableHeight
This property holds whether this list box has variable-height rows.
When the list box has variable-height rows (the default), each row
is as high as the highest item in that row. When it has same-sized
rows, all rows are as high as the highest item in the list box.
See also variableWidth.
Set this property's value with setVariableHeight() and get this property's value with variableHeight().
bool variableWidth
This property holds whether this list box has variable-width columns.
When the list box has variable-width columns, each column is as
wide as the widest item in that column. When it has same-sized
columns (the default), all columns are as wide as the widest item
in the list box.
See also variableHeight.
Set this property's value with setVariableWidth() and get this property's value with variableWidth().
This file is part of the Qt toolkit.
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Trolltech. All Rights Reserved.
