Q3ComboBox Class Reference

 #include <Q3ComboBox>

 Q3ComboBox *c = new Q3ComboBox(this, tr("read-only combobox"));

 Q3ComboBox *c1 = new Q3ComboBox(false, this, tr("read-only combobox"));
 Q3ComboBox *c2 = new Q3ComboBox(true, this, tr("editable combobox"));

Member Function Documentation

Q3ComboBox::Q3ComboBox ( QWidget * parent = 0, const char * name = 0 )

Constructs a combobox widget with parent parent called name.

This constructor creates a popup list if the program uses Motif (or Aqua) look and feel; this is compatible with Motif 1.x and Aqua.

Note: If you use this constructor to create your Q3ComboBox, then the pixmap() function will always return 0. To workaround this, use the other constructor.

Q3ComboBox::Q3ComboBox ( bool rw, QWidget * parent = 0, const char * name = 0 )

Constructs a combobox with a maximum size and either Motif 2.0 or Windows look and feel.

The input field can be edited if rw is true, otherwise the user may only choose one of the items in the combobox.

The parent and name arguments are passed on to the QWidget constructor.

Q3ComboBox::~Q3ComboBox ()

Destroys the combobox.

void Q3ComboBox::activated ( int index ) [signal]

This signal is emitted when a new item has been activated (selected). The index is the position of the item in the combobox.

This signal is not emitted if the item is changed programmatically, e.g. using setCurrentItem().

void Q3ComboBox::activated ( const QString & string ) [signal]

This is an overloaded function.

This signal is emitted when a new item has been activated (selected). string is the selected string.

You can also use the activated(int) signal, but be aware that its argument is meaningful only for selected strings, not for user entered strings.

bool Q3ComboBox::autoResize () const

Returns true if auto-resize is enabled; otherwise returns false.

See also setAutoResize() and autoResize.

void Q3ComboBox::changeItem ( const QString & t, int index )

Replaces the item at position index with the text t.

void Q3ComboBox::changeItem ( const QPixmap & im, int index )

This is an overloaded function.

Replaces the item at position index with the pixmap im, unless the combobox is editable.

See also insertItem().

void Q3ComboBox::changeItem ( const QPixmap & im, const QString & t, int index )

This is an overloaded function.

Replaces the item at position index with the pixmap im and the text t.

See also insertItem().

void Q3ComboBox::clear () [slot]

Removes all combobox items.

void Q3ComboBox::clearEdit () [slot]

Clears the line edit without changing the combobox's contents. Does nothing if the combobox isn't editable.

This is particularly useful when using a combobox as a line edit with history. For example you can connect the combobox's activated() signal to clearEdit() in order to present the user with a new, empty line as soon as Enter is pressed.

See also setEditText().

void Q3ComboBox::clearValidator () [slot]

This slot is equivalent to setValidator( 0 ).

void Q3ComboBox::focusInEvent ( QFocusEvent * e ) [virtual protected]

Reimplemented from QWidget::focusInEvent().

void Q3ComboBox::focusOutEvent ( QFocusEvent * e ) [virtual protected]

Reimplemented from QWidget::focusOutEvent().

void Q3ComboBox::hide ()

Hides the combobox.

See also QWidget::hide().

void Q3ComboBox::highlighted ( int index ) [signal]

This signal is emitted when a new item has been set to be the current item. The index is the position of the item in the combobox.

This signal is not emitted if the item is changed programmatically, e.g. using setCurrentItem().

void Q3ComboBox::highlighted ( const QString & string ) [signal]

This is an overloaded function.

This signal is emitted when a new item has been set to be the current item. string is the item's text.

You can also use the highlighted(int) signal.

void Q3ComboBox::insertItem ( const QString & t, int index = -1 )

Inserts a text item with text t, at position index. The item will be appended if index is negative.

void Q3ComboBox::insertItem ( const QPixmap & pixmap, int index = -1 )

This is an overloaded function.

Inserts a pixmap item at position index. The item will be appended if index is negative.

void Q3ComboBox::insertItem ( const QPixmap & pixmap, const QString & text, int index = -1 )

This is an overloaded function.

Inserts a pixmap item with additional text text at position index. The item will be appended if index is negative.

void Q3ComboBox::insertStrList ( const char ** strings, int numStrings = -1, int index = -1 )

Inserts the array of char * strings at position index in the combobox.

The numStrings argument is the number of strings. If numStrings is -1 (default), the strings array must be terminated with 0.

Example:

 static const char* items[] = { "red", "green", "blue", 0 };
 combo->insertStrList( items );

See also insertStringList().

void Q3ComboBox::insertStrList ( const Q3StrList & list, int index = -1 )

This is an overloaded function.

Inserts the list of strings at position index in the combobox.

This is only for compatibility since it does not support Unicode strings. See insertStringList().

void Q3ComboBox::insertStrList ( const Q3StrList * list, int index = -1 )

This is an overloaded function.

Inserts the list of strings at position index in the combobox.

This is only for compatibility since it does not support Unicode strings. See insertStringList().

void Q3ComboBox::insertStringList ( const QStringList & list, int index = -1 )

Inserts the list of strings at position index in the combobox.

void Q3ComboBox::keyPressEvent ( QKeyEvent * e ) [virtual protected]

Reimplemented from QWidget::keyPressEvent().

QLineEdit * Q3ComboBox::lineEdit () const

Returns the line edit, or 0 if there is no line edit.

Only editable listboxes have a line editor.

See also setLineEdit().

Q3ListBox * Q3ComboBox::listBox () const

Returns the current list box, or 0 if there is no list box. (Q3ComboBox can use QPopupMenu instead of QListBox.) Provided to match setListBox().

See also setListBox().

void Q3ComboBox::mouseDoubleClickEvent ( QMouseEvent * e ) [virtual protected]

Reimplemented from QWidget::mouseDoubleClickEvent().

void Q3ComboBox::mouseMoveEvent ( QMouseEvent * ) [virtual protected]

Reimplemented from QWidget::mouseMoveEvent().

void Q3ComboBox::mousePressEvent ( QMouseEvent * e ) [virtual protected]

Reimplemented from QWidget::mousePressEvent().

void Q3ComboBox::mouseReleaseEvent ( QMouseEvent * ) [virtual protected]

Reimplemented from QWidget::mouseReleaseEvent().

void Q3ComboBox::paintEvent ( QPaintEvent * ) [virtual protected]

Reimplemented from QWidget::paintEvent().

const QPixmap * Q3ComboBox::pixmap ( int index ) const

Returns the pixmap item at position index, or 0 if the item is not a pixmap.

void Q3ComboBox::popup () [virtual]

Pops up the combobox popup list.

If the list is empty, no items appear.

void Q3ComboBox::removeItem ( int index )

Removes the item at position index.

void Q3ComboBox::resizeEvent ( QResizeEvent * e ) [virtual protected]

Reimplemented from QWidget::resizeEvent().

void Q3ComboBox::setAutoResize ( bool enable ) [virtual]

If enable is true, enable auto-resize; disable it otherwise.

See also autoResize.

void Q3ComboBox::setEditText ( const QString & newText ) [virtual slot]

Sets the text in the line edit to newText without changing the combobox's contents. Does nothing if the combobox isn't editable.

This is useful e.g. for providing a good starting point for the user's editing and entering the change in the combobox only when the user presses Enter.

See also clearEdit() and insertItem().

void Q3ComboBox::setEnabled ( bool enable )

Enables the combobox if enable is true; otherwise disables it.

See also QWidget::enabled.

void Q3ComboBox::setFont ( const QFont & font )

Sets the font for both the combobox button and the combobox popup list to font.

void Q3ComboBox::setLineEdit ( QLineEdit * edit ) [virtual]

Sets the line edit to use edit instead of the current line edit.

See also lineEdit().

void Q3ComboBox::setListBox ( Q3ListBox * newListBox ) [virtual]

Sets the combobox to use newListBox instead of the current list box or popup. As a side effect, it clears the combobox of its current contents.

Warning: Q3ComboBox assumes that newListBox->text(n) returns non-null for 0 <= n < newListbox->count(). This assumption is necessary because of the line edit in Q3ComboBox.

See also listBox().

void Q3ComboBox::setPalette ( const QPalette & palette )

Sets the palette for both the combobox button and the combobox popup list to palette.

void Q3ComboBox::setValidator ( const QValidator * v ) [virtual]

Applies the validator v to the combobox so that only text which is valid according to v is accepted.

This function does nothing if the combobox is not editable.

See also validator(), clearValidator(), and QValidator.

QSize Q3ComboBox::sizeHint () const [virtual]

Reimplemented from QWidget::sizeHint().

This implementation caches the size hint to avoid resizing when the contents change dynamically. To invalidate the cached value call setFont().

QString Q3ComboBox::text ( int index ) const

Returns the text item at position index, or QString::null if the item is not a string.

See also currentText().

void Q3ComboBox::textChanged ( const QString & string ) [signal]

This signal is used for editable comboboxes. It is emitted whenever the contents of the text entry field changes. string contains the new text.

void Q3ComboBox::updateMask () [protected]

Updates the widget mask.

See also QWidget::setMask().

const QValidator * Q3ComboBox::validator () const

Returns the validator which constrains editing for this combobox if there is one; otherwise returns 0.

See also setValidator(), clearValidator(), and QValidator.

void Q3ComboBox::wheelEvent ( QWheelEvent * e ) [virtual protected]

Reimplemented from QWidget::wheelEvent().