QListBox Class Reference
The QListBox widget provides a list of selectable, read-only items.
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#include <qlistbox.h>
Inherits QScrollView.
List of all member functions.
Public Members
Public Slots
Signals
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voidÂ
selected ( const QString & )Â
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voidÂ
clicked ( QListBoxItem * )Â
voidÂ
clicked ( QListBoxItem *, const QPoint & )Â
voidÂ
pressed ( QListBoxItem * )Â
voidÂ
pressed ( QListBoxItem *, const QPoint & )Â
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voidÂ
onItem ( QListBoxItem * item )Â
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Protected Members
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virtual voidÂ
paintCell ( QPainter *, int row, int col )Â
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Protected Slots
Properties
| Type | Name | READ | WRITE | Options
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| uint | count | count | |
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| int | numItemsVisible | numItemsVisible | |
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| int | currentItem | currentItem | setCurrentItem | DESIGNABLE false
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| QString | currentText | currentText | |
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| int | topItem | topItem | setTopItem | DESIGNABLE false
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| SelectionMode | selectionMode | selectionMode | setSelectionMode |
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| bool | multiSelection | isMultiSelection | setMultiSelection | DESIGNABLE false
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| LayoutMode | columnMode | columnMode | setColumnMode |
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| LayoutMode | rowMode | rowMode | setRowMode |
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| int | numColumns | numColumns | |
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| int | numRows | numRows | |
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| bool | variableWidth | variableWidth | setVariableWidth |
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| bool | variableHeight | variableHeight | setVariableHeight |
|
Detailed Description
The QListBox widget provides a list of selectable, read-only items.
This is typically a single-column list where zero or one items
are selected at once, but can also be used in many other ways.
QListBox will add scroll bars as necessary, but 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, chiefly because the
scroll bars won't provide very good navigation, but also because
QListBox may become slow at larger sizes.
There is a variety of selection modes, described in the
QListBox::SelectionMode documentation. The default is
single-selection, and you can change it using setSelectionMode().
For compatibility with previous Qt versions there is still the
setMultiSelection() methode. Calling setMultiSelection( TRUE )
is equivalent to setSelectionMode( Multi ), and setMultiSelection( FALSE )
is equivalent to setSelectionMode( Single ). It's suggested not to
use setMultiSelection() anymore, but to use setSelectionMode()
instead.
Since QListBox offers multiple selection it has to display keyboard
focus and selection state separately. Therefore there are functions
both to set the selection state of an item, setSelected(), and to
select which item displays keyboard focus, setCurrentItem().
The list box normally arranges its items in a single column with a
vertical scroll bar if necessary, but it is also possible to have a
different fixed number of columns (setColumnMode()), or as many
columns as will fit in the list box' 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'
assigned screen space (setRowMode( FitToHeight )). In all these
cases, QListBox will add scroll bars as appropriate in at least one
direction.
If multiple rows is 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 ). Of course there
is a similar setVariableWidth().
The items discussed are QListBoxItem objects. QListBox provides
methods to insert new items as a string, 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
(surprise: removeItem()) and clear() the entire list box. Note that
if you create a QListBoxItem yourself and insert it, it becomes the
property of QListBox and you may not delete it. (QListBox will
delete it when appropriate.)
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 listbox.
The list of items can be arbitrarily big; if necessary, QListBox
adds scroll bars. It can be single-column (as most list boxes are)
or multi-column, and offers both single and multiple selection.
(QListBox does however not support multiple-column items; QListView
does that job.)
Also a listbox can display items arranged in a tree. But this is
quite limited, and if you really want to display and work with
a tree, you should use a QListView. The tree stuff in the QListBox
is only supported because it's needed in comboboxes.
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; most things can be done using the indexes too
but unfortunately not everything.
Each item in a QListBox contains a QListBoxItem. One of the items
can be the current item. The highlighted() signal is emitted when
a new item gets highlighted, 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 return when an item is
highlighted.
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 both by tabbing, clicking and the mouse wheel.
New items may be inserted using either insertItem(), insertStrList()
or insertStringList(). inSort() is obsolete, as this method is quite
inefficient. It's preferable to insert the items normally and call
sort() afterwards, or 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 other types than texts 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 and GUI Design Handbook: List Box (two sections)
Member Type Documentation
This enum type decides how QListBox lays out its rows and columns.
The two modes interact, of course.
The possible values for each mode are:
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FixedNumber - there is a fixed number of rows (or columns).
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FitToHeight - there are as many rows as will fit on-screen.
(Ditto with FitToWidth and columns.)
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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 accomodate the row mode you've
set.
This enumerated type is used by QListBox to indicate how it reacts
to selection by the user. It has four values:
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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().
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Multi - When the user selects an item in the most ordinary
way, the selection status of that item is toggled and the other
items are left alone.
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Extended - When the user selects an item in the most
ordinary way, 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 stayes pressed.
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NoSelection - Items cannot be selected.
In other words, Single is a real single-selection list box, Multi a real multi-selection list box, and Extended list box
where 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, with parent as a parent and name
as object name.
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 WNorthWestGravity and
WRepaintNoErase should be cleared.
See also QWidget::clearWFlags() and Qt::WidgetFlags.
QListBox::~QListBox ()
Destroys the list box. Deletes all list box items.
void QListBox::centerCurrentItem ()
If there is a current item, the listbox is scrolled,
so that this item is displayed centered.
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.
See also insertItem() and removeItem().
void QListBox::changeItem ( const QPixmap & pixmap, const QString & text, int index )
Replaces the item at position index with pixmap and text.
The operation is ignored if index is out of range.
See also insertItem() and removeItem().
void QListBox::changeItem ( const QPixmap & pixmap, int index )
Replaces the item at position index with pixmap.
The operation is ignored if index is out of range.
See also insertItem() and removeItem().
void QListBox::changeItem ( const QString & text, int index )
Replaces the item at position index with text.
The operation is ignored if index is out of range.
See also insertItem() and removeItem().
void QListBox::clear ()
Deletes all items in the list.
See also removeItem().
void QListBox::clearSelection () [virtual slot]
Deselects all items, if possible.
Note that a single-selection listbox will automatically select an
item if it has keyboard focus.
void QListBox::clicked ( QListBoxItem * item ) [signal]
This signal is emitted whenever the user clicks (mouse pressed + mouse released)
into the listbox.
item is the pointer to the clicked listbox item or NULL, if the user didn't click on an item.
Note that you may not delete any QListBoxItem objects in slots
connected to this signal.
void QListBox::clicked ( QListBoxItem * item, const QPoint & pnt ) [signal]
This signal is emitted whenever the user clicks (mouse pressed + mouse released)
into the listbox.
item is the pointer to the clicked listbox item or NULL, if the user didn't click on an item.
pnt is the position where the user has clicked.
Note that you may not delete any QListBoxItem objects in slots
connected to this signal.
QListBox::LayoutMode QListBox::columnMode() const
Returns the column layout mode for this list box. This is
normally FixedNumber, but can be changed by calling setColumnMode()
See also rowMode(), setColumnMode() and numColumns().
uint QListBox::count () const
Returns the number of items in the list box.
void QListBox::currentChanged ( QListBoxItem * item ) [signal]
This signal is emitted when the user highlights a new current item.
The argument is the index of the new item, which is already current.
See also setCurrentItem() and currentItem().
int QListBox::currentItem () const
Returns the index of the current (highlighted) item of the list box,
or -1 if no item has been selected.
See also topItem().
QString QListBox::currentText () const
Returns the text of the current item.
This is equivalent to text(currentItem()).
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.
item is the listbox item onto which the user did the double click.
void QListBox::ensureCurrentVisible () [virtual slot]
Ensures that the current item is visible.
QListBoxItem * QListBox::findItem ( const QString & text ) const
Finds the first listbox item which starts with
text and returns it, or returns 0 of no
such item could be found.
The search is done case-insensitive.
QListBoxItem * QListBox::firstItem () const
Returns the first item of this listbox.
void QListBox::focusInEvent ( QFocusEvent * e ) [virtual protected]
Reimplemented for internal reasons; the API is not affected.
Reimplemented from QWidget.
void QListBox::focusOutEvent ( QFocusEvent * ) [virtual protected]
Reimplemented for internal reasons; the API is not affected.
Reimplemented from QWidget.
void QListBox::highlighted ( QListBoxItem * ) [signal]
This signal is emitted when the user highlights a new current item.
The argument is a pointer to the new current item.
See also selected(), currentItem() and selectionChanged().
void QListBox::highlighted ( const QString & ) [signal]
This signal is emitted when the user highlights a new current item
and the new item is a string. The argument is the text of the
new current item.
See also selected(), currentItem() and selectionChanged().
void QListBox::highlighted ( int index ) [signal]
This signal is emitted when the user highlights a new current item.
The argument is the index of the new item, which is already current.
See also selected(), currentItem() and selectionChanged().
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 a NULL-Pointer.
See also item().
void QListBox::insertItem ( const QListBoxItem * lbi, const QListBoxItem * after )
Inserts the item lbi into the list after the item after.
If after is NULL, lbi is inserted at the beginning.
See also insertStrList().
void QListBox::insertItem ( const QListBoxItem * lbi, int index=-1 )
Inserts the item lbi into the list at 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().
void QListBox::insertItem ( const QPixmap & pixmap, const QString & text, int index=-1 )
Inserts pixmap and text into the list at index.
If index is negative, pixmap is inserted at the end of the list.
See also insertStrList().
void QListBox::insertItem ( const QPixmap & pixmap, int index=-1 )
Inserts pixmap into the list at index.
If index is negative, pixmap is inserted at the end of the list.
See also insertStrList().
void QListBox::insertItem ( const QString & text, int index=-1 )
Inserts text into the list at index.
If index is negative, text 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 item 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() - it 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 )
Inserts the string list list into the list at item 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() - it 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 )
Inserts the numStrings strings of the array strings into the
list at itemindex.
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() - it 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 item 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 () [slot]
Inverts the selection. Works only in Multi and Extended selection mode.
bool QListBox::isMultiSelection () const
This function is obsolete. It is provided to keep old source working, and will probably be removed in a future version of Qt. We strongly advise against using it in new code.
Consider using selectionMode() instead of this method.
Returns TRUE if the listbox is in multi-selection mode or
extended selection mode, and FALSE if it is in single-selection mode
or no-selection more.
See also selectionMode() and setSelectionMode().
bool QListBox::isRubberSelecting () const [protected]
Returns whether the user is selecting items using a rubber rectangle.
bool QListBox::isSelected ( const QListBoxItem * i ) const
Returns TRUE if item i is selected. Returns FALSE if it is not
selected or if there is an error.
bool QListBox::isSelected ( int i ) const
Returns TRUE if item i is selected. Returns FALSE if it is not
selected or if there is an error.
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().
QListBoxItem * QListBox::itemAt ( QPoint p ) const
Returns a pointer to the item at p, which is in on-screen
coordinates, or a null pointer if there is no item at p.
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 item occupies in
viewport()'s coordinates, or an invalid rectangle if item is a null
pointer or is not currently visible.
bool QListBox::itemVisible ( const QListBoxItem * item )
Returns TRUE if item is at least partly visible, or else FALSE.
bool QListBox::itemVisible ( int index )
Returns TRUE if the item at position index is at least partly
visible.
void QListBox::keyPressEvent ( QKeyEvent * e ) [virtual protected]
Reimplemented for internal reasons; the API is not affected.
Reimplemented from QWidget.
long QListBox::maxItemWidth () const
Returns the width of the largest item in the listbox.
QSize QListBox::minimumSizeHint () const [virtual]
Reimplemented for internal reasons; the API is not affected.
Reimplemented from QWidget.
void QListBox::mouseButtonClicked ( int button, QListBoxItem * item, const QPoint & pos ) [signal]
This signal is emitted whenever the user clicks (mouse pressed + mouse released)
into the listbox.
button is the mouse button, which the user pressed.
item is the pointer to the clicked listbox item or NULL, if the user didn't click on an item.
pos is the position where the user has clicked.
Note that you may 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 whenever the user presses the mouse button
on a listbox.
button is the mouse button, which the user pressed.
item is the pointer to the listbox item onto which the user pressed the
mouse button or NULL, if the user didn't press the mouse on an item.
pos is the position of the mouse cursor where the mouse cursor was
when the user pressed the mouse button.
Note that you may not delete any QListBoxItem objects in slots
connected to this signal.
void QListBox::mouseDoubleClickEvent ( QMouseEvent * e ) [virtual protected]
Reimplemented for internal reasons; the API is not affected.
Reimplemented from QWidget.
void QListBox::mouseMoveEvent ( QMouseEvent * e ) [virtual protected]
Reimplemented for internal reasons; the API is not affected.
Reimplemented from QWidget.
void QListBox::mousePressEvent ( QMouseEvent * e ) [virtual protected]
Reimplemented for internal reasons; the API is not affected.
Reimplemented from QWidget.
void QListBox::mouseReleaseEvent ( QMouseEvent * e ) [virtual protected]
Reimplemented for internal reasons; the API is not affected.
Reimplemented from QWidget.
int QListBox::numColumns () const
Returns the number of columns in the list box. This is normally
1, but can be different if setColumnMode() or setRowMode() has been
called.
See also setColumnMode(), setRowMode() and numRows().
int QListBox::numItemsVisible () const
Returns the number of visible items. Both partially and entirely
visible items are counted.
int QListBox::numRows () const
Returns 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 setRowMode() and numColumns().
void QListBox::onItem ( QListBoxItem * i ) [signal]
This signal is emitted, when the user moves the mouse cursor onto an item.
It's only emitted once per item.
void QListBox::onViewport () [signal]
This signal is emitted, when the user moves the mouse cursor, which was
on an item away from the item onto the viewport.
void QListBox::paintCell ( QPainter * p, int row, int col ) [virtual protected]
Provided for compatibility with the old QListBox. We recommend
using QListBoxItem::paint().
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 whenever the user presses the mouse button
on a listbox.
item is the pointer to the listbox item onto which the user pressed the
mouse button or NULL, if the user didn't press the mouse on an item.
Note that you may not delete any QListBoxItem objects in slots
connected to this signal.
void QListBox::pressed ( QListBoxItem * item, const QPoint & pnt ) [signal]
This signal is emitted whenever the user presses the mouse button
on a listbox.
item is the pointer to the listbox item onto which the user pressed the
mouse button or NULL, if the user didn't press the mouse on an item.
pnt is the position of the mouse cursor where the mouse cursor was
when the user pressed the mouse button.
Note that you may not delete any QListBoxItem objects in slots
connected to this signal.
void QListBox::removeItem ( int index )
Removes and deletes the item at position index. If index is equal
to currentItem(), a new item gets highlighted and the highlighted() signal
is emitted.
See also insertItem() and clear().
void QListBox::resizeEvent ( QResizeEvent * e ) [virtual protected]
Reimplemented for internal reasons; the API is not affected.
Reimplemented from QWidget.
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 (ie. when
it's released). 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. Then
arguments are the relevant QListBoxItem (may be 0) and the point in
global coordinates.
QListBox::LayoutMode QListBox::rowMode() const
Returns the row layout mode for this list box. This is normally
Variable, but can be changed by calling setRowMode().
See also columnMode(), setRowMode() and numRows().
void QListBox::selectAll ( bool select ) [slot]
If select is TRUE, all items get selected, else all get unselected.
This works only in the selection modes Multi and Extended. In
Single and NoSelection mode the selection of the current item is
just set to select.
void QListBox::selected ( QListBoxItem * ) [signal]
This signal is emitted when the user double-clicks on an item or
presses return when an item is highlighted. The argument is a
pointer to the new selected item.
See also highlighted() and selectionChanged().
void QListBox::selected ( const QString & ) [signal]
This signal is emitted when the user double-clicks on an item or
presses return while an item is highlighted, and the selected item
is (or has) a string. The argument is the text of the selected
item.
See also highlighted() and selectionChanged().
void QListBox::selected ( int index ) [signal]
This signal is emitted when the user double-clicks on an item or
presses return when an item is highlighted. The argument is the
index of the selected item.
See also highlighted() and selectionChanged().
void QListBox::selectionChanged () [signal]
This signal is emitted when the selection set of a
listbox 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 signal is emitted when the selection in a single-selection
listbox changes. item is the new selected listbox item.
See also selected() and currentItem().
QListBox::SelectionMode QListBox::selectionMode() const
Returns the selection mode of the list box. The initial mode is Single.
See also setSelectionMode().
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 setTopItem().
void QListBox::setColumnMode ( LayoutMode mode )
Sets the column layout mode to mode, and the number of displayed
columns accordingly.
The row layout mode implicitly becomes Variable.
If mode is Variable, this function returns without doing anything.
See also setRowMode() and columnMode().
void QListBox::setColumnMode ( int columns ) [virtual]
Sets the column layout mode for this list box to FixedNumber, and
sets the number of displayed columns accordingly.
See also setRowMode(), columnMode() and numColumns().
void QListBox::setCurrentItem ( QListBoxItem * i ) [virtual]
Sets the highlighted item to the item i. The highlighting is moved and
the list box scrolled as necessary.
See also currentItem().
void QListBox::setCurrentItem ( int index ) [virtual]
This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.
This is a bit slower than the QListBoxItem * version.
void QListBox::setFont ( const QFont & font ) [virtual]
Reimplemented for internal reasons; the API is not affected.
void QListBox::setMultiSelection ( bool enable )
This function is obsolete. It is provided to keep old source working, and will probably be removed in a future version of Qt. We strongly advise against using it in new code.
Consider using setSelectionMode() instead of this method.
Sets the list box to multi-selection mode if enable is TRUE, and
to single-selection mode if enable is FALSE. We recommend using
setSelectionMode() instead; that function also offers two other modes.
See also setSelectionMode() and selectionMode().
void QListBox::setRowMode ( LayoutMode mode )
Sets the row layout mode to mode, and the number of displayed
rows accordingly.
The column layout mode implicitly becomes Variable.
If mode is Variable, this function returns without doing anything.
See also setColumnMode() and rowMode().
void QListBox::setRowMode ( int rows ) [virtual]
Sets the row layout mode for this list box to FixedNumber and sets the
number of displayed rows accordingly.
See also setColumnMode(), rowMode() and numRows().
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 listbox is a single-selection listbox and and select is TRUE,
setCurrentItem() is called.
If the listbox is a single-selection listbox and and select is
FALSE, clearSelection() is called if item is the currently
selected item.
Note that for this function, no-selection means multi-selection.
The user cannot select items in a no-selection list box, but the
application programmer can.
See also setMultiSelection(), setCurrentItem(), clearSelection() and currentItem().
void QListBox::setSelected ( int index, bool select )
Selects the item at position index if select is TRUE, or
unselects it if select is FALSE, and repaints the item
appropriately.
If the listbox is a single-selection listbox and and select is TRUE,
setCurrentItem() will be called.
If the listbox is a single-selection listbox and and select is FALSE,
clearSelection() will be called if index is the currently selected
item.
See also setMultiSelection(), setCurrentItem(), clearSelection() and currentItem().
void QListBox::setSelectionMode ( SelectionMode mode )
Sets the list box to selection mode mode, which may be one of
Single (the default), Extended, Multi or NoSelection.
See also selectionMode().
void QListBox::setTopItem ( int index ) [virtual]
Scrolls the list box so the item at position index in the list
is displayed in the top row of the list box.
See also topItem() and ensureCurrentVisible().
void QListBox::setVariableHeight ( bool enable ) [virtual]
Sets this list box to have variable-height rows if enable is
TRUE, and equal-height rows if enable is FALSE.
When the list box has variable-height rows, 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.
The default is TRUE.
See also setVariableWidth() and variableHeight().
void QListBox::setVariableWidth ( bool enable ) [virtual]
Sets this list box to have variable-width columns if enable is
TRUE, and equal-width columns if enable is FALSE.
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,
all columns are as wide as the widest item in the list box.
The default is FALSE.
See also setVariableHeight() and variableWidth().
void QListBox::showEvent ( QShowEvent * ) [virtual protected]
Reimplemented for internal reasons; the API is not affected.
Reimplemented from QWidget.
QSize QListBox::sizeHint () const [virtual]
Reimplemented for internal reasons; the API is not affected.
Reimplemented from QWidget.
void QListBox::sort ( bool ascending = TRUE )
Sorts the item in ascending order, if ascending is TRUE, or
descending otherwise.
To compare the items, the text (QListBoxItem::text()) of the items
is used. The sorting is done using the Quick-Sort Alogorithm.
void QListBox::takeItem ( const QListBoxItem * item )
Removes item from the listbox and causes an update of the screen
display. The item is not deleted. You should normally not need to
call this function, as QListBoxItem::~QListBoxItem() calls it. The
normal way to delete an item is delete.
See also QListBox::insertItem().
QString QListBox::text ( int index ) const
Returns the text at position index, or a
null string
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 listbox is a multi-selection listbox.
See also setMultiSelection().
int QListBox::topItem () const
Returns the index of an item at the top of the screen. If there
are more than one of them, an arbitrary item is selected and returned.
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 ( QListBoxItem * i ) [protected]
Repaints i.
void QListBox::updateItem ( int index ) [protected]
Repaints the item at position index in the list.
bool QListBox::variableHeight () const
Returns TRUE if this list box has variable-height rows, and
FALSE if all the rows have the same height.
See also setVariableHeight() and setVariableWidth().
bool QListBox::variableWidth () const
Returns TRUE if this list box has variable-width columns, and
FALSE if all the columns have the same width.
See also setVariableHeight() and setVariableWidth().
void QListBox::viewportMouseDoubleClickEvent ( QMouseEvent * e ) [virtual protected]
Reimplemented for internal reasons; the API is not affected.
Reimplemented from QScrollView.
void QListBox::viewportMouseMoveEvent ( QMouseEvent * e ) [virtual protected]
Reimplemented for internal reasons; the API is not affected.
Reimplemented from QScrollView.
void QListBox::viewportMousePressEvent ( QMouseEvent * e ) [virtual protected]
Reimplemented for internal reasons; the API is not affected.
Reimplemented from QScrollView.
void QListBox::viewportMouseReleaseEvent ( QMouseEvent * e ) [virtual protected]
Reimplemented for internal reasons; the API is not affected.
Reimplemented from QScrollView.
void QListBox::viewportPaintEvent ( QPaintEvent * e ) [virtual]
Reimplemented for internal reasons; the API is not affected.
Reimplemented from QScrollView.
void QListBox::clearInputString () [protected slot]
For internal use only.
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