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RedHat 9 (Linux i386) - man page for qlineedit (redhat section 3qt)

QLineEdit(3qt)									   QLineEdit(3qt)

NAME
       QLineEdit - One-line text editor

SYNOPSIS
       #include <qlineedit.h>

       Inherits QFrame.

   Public Members
       QLineEdit ( QWidget * parent, const char * name = 0 )
       QLineEdit ( const QString & contents, QWidget * parent, const char * name = 0 )
       ~QLineEdit ()
       QString text () const
       QString displayText () const
       int maxLength () const
       bool frame () const
       enum EchoMode { Normal, NoEcho, Password }
       EchoMode echoMode () const
       bool isReadOnly () const
       const QValidator * validator () const
       virtual QSize sizeHint () const
       virtual QSize minimumSizeHint () const
       int cursorPosition () const
       bool validateAndSet ( const QString & newText, int newPos, int newMarkAnchor, int
	   newMarkDrag )
       int alignment () const
       void cursorLeft ( bool mark, int steps = 1 )  (obsolete)
       void cursorRight ( bool mark, int steps = 1 )  (obsolete)
       void cursorForward ( bool mark, int steps = 1 )
       void cursorBackward ( bool mark, int steps = 1 )
       void cursorWordForward ( bool mark )
       void cursorWordBackward ( bool mark )
       void backspace ()
       void del ()
       void home ( bool mark )
       void end ( bool mark )
       void setEdited ( bool )
       bool edited () const
       bool hasSelectedText () const
       QString selectedText () const
       bool getSelection ( int * start, int * end )
       bool isUndoAvailable () const
       bool isRedoAvailable () const
       bool hasMarkedText () const  (obsolete)
       QString markedText () const  (obsolete)
       bool dragEnabled () const
       int characterAt ( int xpos, QChar * chr ) const

   Public Slots
       virtual void setText ( const QString & text )
       virtual void selectAll ()
       virtual void deselect ()
       virtual void clearValidator ()
       virtual void insert ( const QString & newText )
       virtual void clear ()
       virtual void undo ()
       virtual void redo ()
       virtual void setMaxLength ( int )
       virtual void setFrame ( bool )
       virtual void setEchoMode ( EchoMode )
       virtual void setReadOnly ( bool )
       virtual void setValidator ( const QValidator * v )
       virtual void setSelection ( int start, int length )
       virtual void setCursorPosition ( int )
       virtual void setAlignment ( int flag )
       virtual void cut ()
       virtual void copy () const
       virtual void paste ()
       virtual void setDragEnabled ( bool b )

   Signals
       void textChanged ( const QString & )
       void returnPressed ()
       void lostFocus ()
       void selectionChanged ()

   Properties
       Alignment alignment - the alignment of the line edit
       int cursorPosition - the current cursor position for this line edit
       QString displayText - the displayed text  (read only)
       bool dragEnabled - whether the lineedit starts a drag if the user presses and moves the
	   mouse on some selected text
       EchoMode echoMode - the line edit's echo mode
       bool edited - whether the line edit has been edited
       bool frame - whether the line edit draws itself with a frame
       bool hasMarkedText - whether part of the text has been selected by the user (e.g. by
	   clicking and dragging)  (read only)	(obsolete)
       bool hasSelectedText - whether there is any text selected  (read only)
       QString markedText - the text selected by the user (e.g. by clicking and dragging), or
	   QString::null if no text is selected  (read only)  (obsolete)
       int maxLength - the maximum permitted length of the text
       bool readOnly - whether the line edit is read only
       bool redoAvailable - whether redo is available  (read only)
       QString selectedText - the selected text  (read only)
       QString text - the line edit's text
       bool undoAvailable - whether undo is available  (read only)

   Protected Members
       virtual void keyPressEvent ( QKeyEvent * e )
       void repaintArea ( int from, int to )  (obsolete)
       virtual QPopupMenu * createPopupMenu ()

DESCRIPTION
       The QLineEdit widget is a one-line text editor.

       A line edit allows the user to enter and edit a single line of plain text with a useful
       collection of editing functions, including undo and redo, cut and paste, and drag and
       drop.

       By changing the echoMode() of a line edit, it can also be used as a "write-only" field,
       for inputs such as passwords.

       The length of the field can be constrained to maxLength(), or the value can be arbitrarily
       constrained using a validator().

       A related class is QTextEdit which allows multi-line, rich-text editing.

       You can change the text with setText() or insert(). The text is retrieved with text(); the
       displayed text (which may be different, see EchoMode) is retrieved with displayText().
       Text can be selected with setSelection() or selectAll(), and the selection can be cut(),
       copy()ied and paste()d. The text can be aligned with setAlignment().

       When the text changes the textChanged() signal is emitted; when the Return or Enter key is
       pressed the returnPressed() signal is emitted. Note that if there is a validator set on
       the line edit, the returnPressed() signal will only be emitted if the validator returns
       Acceptable.

       By default, QLineEdits have a frame as specified by the Windows and Motif style guides;
       you can turn it off by calling setFrame(FALSE).

       The default key bindings are described below. A right mouse button menu presents some of
       the editing commands to the user. <center>.nf

       </center>

       Any other key sequence, that represents a valid character, will cause the character to be
       inserted into the line.

					    [Image Omitted]

					    [Image Omitted]

       See also QTextEdit, QLabel, QComboBox, GUI Design Handbook: Field, Entry, and Basic
       Widgets.

   Member Type Documentation
QLineEdit::EchoMode
       This enum type describes how a line edit should display its contents.

       QLineEdit::Normal - display characters as they are entered. This is the default.

       QLineEdit::NoEcho - do not display anything. This may be appropriate for passwords where
       even the length of the password should be kept secret.

       QLineEdit::Password - display asterisks instead of the characters actually entered.

       See also echoMode and echoMode.

MEMBER FUNCTION DOCUMENTATION
QLineEdit::QLineEdit ( QWidget * parent, const char * name = 0 )
       Constructs a line edit with no text.

       The maximum text length is set to 32767 characters.

       The parent and name arguments are sent to the QWidget constructor.

       See also text and maxLength.

QLineEdit::QLineEdit ( const QString & contents, QWidget * parent, const char * name = 0 )
       Constructs a line edit containing the text contents.

       The cursor position is set to the end of the line and the maximum text length to 32767
       characters.

       The parent and name arguments are sent to the QWidget constructor.

       See also text and maxLength.

QLineEdit::~QLineEdit ()
       Destroys the line edit.

int QLineEdit::alignment () const
       Returns the alignment of the line edit. See the "alignment" property for details.

void QLineEdit::backspace ()
       Deletes the character to the left of the text cursor and moves the cursor one position to
       the left. If any text has been selected by the user (e.g. by clicking and dragging), the
       cursor will be put at the beginning of the selected text and the selected text will be
       removed.

       See also del().

int QLineEdit::characterAt ( int xpos, QChar * chr ) const
       Returns the index position of the character which is at xpos (in logical coordinates from
       the left). If chr is not 0, *chr is populated with the character at this position.

void QLineEdit::clear () [virtual slot]
       Clears the contents of the editor. The edited property is set to FALSE. Undo/redo history
       is updated.

void QLineEdit::clearValidator () [virtual slot]
       This slot is equivalent to setValidator( 0 ).

void QLineEdit::copy () const [virtual slot]
       Copies the selected text to the clipboard, if there is any, and if echoMode() is Normal.

       See also cut() and paste().

QPopupMenu * QLineEdit::createPopupMenu () [virtual protected]
       This function is called to create the popup menu which is shown when the user clicks on
       the line edit with the right mouse button. If you want to create a custom popup menu,
       reimplement this function and return the popup menu you create. The popup menu's ownership
       is transferred to the caller.

void QLineEdit::cursorBackward ( bool mark, int steps = 1 )
       Moves the cursor back steps characters. If mark is TRUE each character moved over is added
       to the selection; if mark is FALSE the selection is cleared.

       See also cursorForward().

void QLineEdit::cursorForward ( bool mark, int steps = 1 )
       Moves the cursor forward steps characters. If mark is TRUE each character moved over is
       added to the selection; if mark is FALSE the selection is cleared.

       See also cursorBackward().

void QLineEdit::cursorLeft ( bool mark, int steps = 1 )
       This function is obsolete. It is provided to keep old source working. We strongly advise
       against using it in new code.

       For compatibilty with older applications only. Use cursorBackward() instead.

       See also cursorBackward().

int QLineEdit::cursorPosition () const
       Returns the current cursor position for this line edit. See the "cursorPosition" property
       for details.

void QLineEdit::cursorRight ( bool mark, int steps = 1 )
       This function is obsolete. It is provided to keep old source working. We strongly advise
       against using it in new code.

       Use cursorForward() instead.

       See also cursorForward().

void QLineEdit::cursorWordBackward ( bool mark )
       Moves the cursor one word backward. If mark is TRUE, the word is also selected.

       See also cursorWordForward().

void QLineEdit::cursorWordForward ( bool mark )
       Moves the cursor one word forward. If mark is TRUE, the word is also selected.

       See also cursorWordBackward().

void QLineEdit::cut () [virtual slot]
       Copies the selected text to the clipboard and deletes it, if there is any, and if
       echoMode() is Normal.

       If the current validator disallows deleting the selected text, cut() will copy it but not
       delete it.

       See also copy() and paste().

void QLineEdit::del ()
       Deletes the character to the right of the text cursor. If any text has been selected by
       the user (e.g. by clicking and dragging), the cursor will be put at the beginning of the
       selected text and the selected text will be removed.

       See also backspace().

void QLineEdit::deselect () [virtual slot]
       De-selects all text (i.e. removes highlighting) and leaves the cursor at the current
       position.

       See also setSelection() and selectAll().

QString QLineEdit::displayText () const
       Returns the displayed text. See the "displayText" property for details.

bool QLineEdit::dragEnabled () const
       Returns TRUE if the lineedit starts a drag if the user presses and moves the mouse on some
       selected text; otherwise returns FALSE. See the "dragEnabled" property for details.

EchoMode QLineEdit::echoMode () const
       Returns the line edit's echo mode. See the "echoMode" property for details.

bool QLineEdit::edited () const
       Returns TRUE if the line edit has been edited; otherwise returns FALSE. See the "edited"
       property for details.

void QLineEdit::end ( bool mark )
       Moves the text cursor to the end of the line. If mark is TRUE, text is selected towards
       the last position; otherwise, any selected text is unselected if the cursor is moved.

       See also home().

bool QLineEdit::frame () const
       Returns TRUE if the line edit draws itself with a frame; otherwise returns FALSE. See the
       "frame" property for details.

bool QLineEdit::getSelection ( int * start, int * end )
       This function sets *start to the position in the text where the selection starts and *end
       to the position where the selection ends. Returns TRUE if both start and end are not 0 and
       if there is some selected text; otherwise returns FALSE.

       See also setSelection().

bool QLineEdit::hasMarkedText () const
       Returns TRUE if part of the text has been selected by the user (e.g. by clicking and
       dragging); otherwise returns FALSE. See the "hasMarkedText" property for details.

bool QLineEdit::hasSelectedText () const
       Returns TRUE if there is any text selected; otherwise returns FALSE. See the
       "hasSelectedText" property for details.

void QLineEdit::home ( bool mark )
       Moves the text cursor to the beginning of the line. If mark is TRUE, text is selected
       towards the first position; otherwise, any selected text is unselected if the cursor is
       moved.

       See also end().

void QLineEdit::insert ( const QString & newText ) [virtual slot]
       Removes any selected text, inserts newText, and validates the result. If it is valid, it
       sets it as the new contents of the line edit.

bool QLineEdit::isReadOnly () const
       Returns TRUE if the line edit is read only; otherwise returns FALSE. See the "readOnly"
       property for details.

bool QLineEdit::isRedoAvailable () const
       Returns TRUE if redo is available; otherwise returns FALSE. See the "redoAvailable"
       property for details.

bool QLineEdit::isUndoAvailable () const
       Returns TRUE if undo is available; otherwise returns FALSE. See the "undoAvailable"
       property for details.

void QLineEdit::keyPressEvent ( QKeyEvent * e ) [virtual protected]
       Converts key press event e into a line edit action.

       If Return or Enter is pressed and the current text is valid (or can be made valid by the
       validator), the signal returnPressed() is emitted.

       The default key bindings are listed in the detailed description.

       Reimplemented from QWidget.

void QLineEdit::lostFocus () [signal]
       This signal is emitted when the line edit has lost focus.

       See also focus, QWidget::focusInEvent(), and QWidget::focusOutEvent().

QString QLineEdit::markedText () const
       Returns the text selected by the user (e.g. by clicking and dragging), or QString::null if
       no text is selected. See the "markedText" property for details.

int QLineEdit::maxLength () const
       Returns the maximum permitted length of the text. See the "maxLength" property for
       details.

QSize QLineEdit::minimumSizeHint () const [virtual]
       Returns a minimum size for the line edit.

       The width returned is enough for at least one character.

       Reimplemented from QWidget.

void QLineEdit::paste () [virtual slot]
       Inserts the clipboard's text at the cursor position, deleting any selected text.

       If the end result is not acceptable for the current validator, nothing happens.

       See also copy() and cut().

void QLineEdit::redo () [virtual slot]
       Redoes the last operation.

void QLineEdit::repaintArea ( int from, int to ) [protected]
       This function is obsolete. It is provided to keep old source working. We strongly advise
       against using it in new code.

       Repaints all characters from from to to. If cursorPos is between from and to, ensures that
       cursorPos is visible.

void QLineEdit::returnPressed () [signal]
       This signal is emitted when the Return or Enter key is pressed. Note that if there is a
       validator set on the line edit, the returnPressed() signal will only be emitted if the
       validator returns Acceptable.

       Example: popup/popup.cpp.

void QLineEdit::selectAll () [virtual slot]
       Selects all the text (i.e. highlights it) and moves the cursor to the end. This is useful
       when a default value has been inserted because if the user types before clicking on the
       widget, the selected text will be erased.

       See also setSelection() and deselect().

QString QLineEdit::selectedText () const
       Returns the selected text. See the "selectedText" property for details.

void QLineEdit::selectionChanged () [signal]
       This signal is emitted whenever the selection changes.

       See also hasSelectedText and selectedText.

void QLineEdit::setAlignment ( int flag ) [virtual slot]
       Sets the alignment of the line edit to flag. See the "alignment" property for details.

void QLineEdit::setCursorPosition ( int ) [virtual slot]
       Sets the current cursor position for this line edit. See the "cursorPosition" property for
       details.

void QLineEdit::setDragEnabled ( bool b ) [virtual slot]
       Sets whether the lineedit starts a drag if the user presses and moves the mouse on some
       selected text to b. See the "dragEnabled" property for details.

void QLineEdit::setEchoMode ( EchoMode ) [virtual slot]
       Sets the line edit's echo mode. See the "echoMode" property for details.

void QLineEdit::setEdited ( bool )
       Sets whether the line edit has been edited. See the "edited" property for details.

void QLineEdit::setFrame ( bool ) [virtual slot]
       Sets whether the line edit draws itself with a frame. See the "frame" property for
       details.

void QLineEdit::setMaxLength ( int ) [virtual slot]
       Sets the maximum permitted length of the text. See the "maxLength" property for details.

void QLineEdit::setReadOnly ( bool ) [virtual slot]
       Sets whether the line edit is read only. See the "readOnly" property for details.

void QLineEdit::setSelection ( int start, int length ) [virtual slot]
       Sets the selected area of this line edit to start at position start and be length
       characters long.

       See also deselect(), selectAll(), and getSelection().

void QLineEdit::setText ( const QString & text ) [virtual slot]
       Sets the line edit's text to text. See the "text" property for details.

void QLineEdit::setValidator ( const QValidator * v ) [virtual slot]
       Sets this line edit to only accept input that the validator, v, will accept. This allows
       you to place any arbitrary constraints on the text which may be entered.

       If v == 0, setValidator() removes the current input validator. The initial setting is to
       have no input validator (i.e. any input is accepted up to maxLength()).

       See also validator() and QValidator.

       Examples:

QSize QLineEdit::sizeHint () const [virtual]
       Returns a recommended size for the widget.

       The width returned, in pixels, is usually enough for about 15 to 20 characters.

       Example: addressbook/centralwidget.cpp.

QString QLineEdit::text () const
       Returns the line edit's text. See the "text" property for details.

void QLineEdit::textChanged ( const QString & ) [signal]
       This signal is emitted whenever the text changes. The argument is the new text.

       Examples:

void QLineEdit::undo () [virtual slot]
       Undoes the last operation.

bool QLineEdit::validateAndSet ( const QString & newText, int newPos, int newMarkAnchor, int
       newMarkDrag )
       Validates and perhaps sets this line edit to contain newText with the cursor at position
       newPos, with selected text from newMarkAnchor to newMarkDrag. Returns TRUE if it changes
       the line edit; otherwise returns FALSE.

       Linebreaks in newText are converted to spaces, and the text is truncated to maxLength()
       before its validity is tested.

       Repaints and emits textChanged() if appropriate.

const QValidator * QLineEdit::validator () const
       Returns a pointer to the current input validator, or 0 if no validator has been set.

       See also setValidator().

       Example: wizard/wizard.cpp.

   Property Documentation
Alignment alignment
       This property holds the alignment of the line edit.

       Possible Values are Qt::AlignAuto, Qt::AlignLeft, Qt::AlignRight and Qt::AlignHCenter.

       Attempting to set the alignment to an illegal flag combination does nothing.

       See also Qt::AlignmentFlags.

       Set this property's value with setAlignment() and get this property's value with
       alignment().

int cursorPosition
       This property holds the current cursor position for this line edit.

       Setting the cursor position causes a repaint when appropriate.

       Set this property's value with setCursorPosition() and get this property's value with
       cursorPosition().

QString displayText
       This property holds the displayed text.

       If EchoMode is Normal this returns the same as text(); if EchoMode is Password it returns
       a string of asterisks the text().length() characters long, e.g. "******"; if EchoMode is
       NoEcho returns an empty string, "".

       See also echoMode, text, and EchoMode.

       Get this property's value with displayText().

bool dragEnabled
       This property holds whether the lineedit starts a drag if the user presses and moves the
       mouse on some selected text.

       Set this property's value with setDragEnabled() and get this property's value with
       dragEnabled().

EchoMode echoMode
       This property holds the line edit's echo mode.

       The initial setting is Normal, but QLineEdit also supports NoEcho and Password modes.

       The widget's display and the ability to copy or drag the text is affected by this setting.

       See also EchoMode and displayText.

       Set this property's value with setEchoMode() and get this property's value with
       echoMode().

bool edited
       This property holds whether the line edit has been edited.

       The edited flag is never read by QLineEdit; it has a default value of FALSE and is changed
       to TRUE whenever the user changes the line edit's contents.

       This is useful for things that need to provide a default value but cannot find the default
       at once. Just start the line edit without the best default; when the default is known,
       check the edited() return value and set the line edit's contents if the user has not
       started editing the line edit.

       Calling setText() resets the edited flag to FALSE.

       Set this property's value with setEdited() and get this property's value with edited().

bool frame
       This property holds whether the line edit draws itself with a frame.

       If enabled (the default) the line edit draws itself inside a two-pixel frame, otherwise
       the line edit draws itself without any frame.

       Set this property's value with setFrame() and get this property's value with frame().

bool hasMarkedText
       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 part of the text has been selected by the user (e.g. by
       clicking and dragging).

       Get this property's value with hasMarkedText().

       See also selectedText.

bool hasSelectedText
       This property holds whether there is any text selected.

       hasSelectedText() returns TRUE if some or all of the text has been selected by the user
       (e.g. by clicking and dragging); otherwise returns FALSE.

       See also selectedText.

       Get this property's value with hasSelectedText().

QString markedText
       This function is obsolete. It is provided to keep old source working. We strongly advise
       against using it in new code.

       This property holds the text selected by the user (e.g. by clicking and dragging), or
       QString::null if no text is selected.

       Get this property's value with markedText().

       See also hasSelectedText.

int maxLength
       This property holds the maximum permitted length of the text.

       If the text is too long, it is truncated at the limit.

       If truncation occurs any selected text will be unselected, the cursor position is set to 0
       and the first part of the string is shown.

       Set this property's value with setMaxLength() and get this property's value with
       maxLength().

bool readOnly
       This property holds whether the line edit is read only.

       In read-only mode, the user can still copy the text to the clipboard or drag-and-drop the
       text, but cannot edit it.

       QLineEdit does not show a cursor in read-only mode.

       See also enabled.

       Set this property's value with setReadOnly() and get this property's value with
       isReadOnly().

bool redoAvailable
       This property holds whether redo is available.

       Get this property's value with isRedoAvailable().

QString selectedText
       This property holds the selected text.

       If there is no selected text this property's value is QString::null.

       See also hasSelectedText.

       Get this property's value with selectedText().

QString text
       This property holds the line edit's text.

       Setting this property clears the selection, moves the cursor to the end of the line and
       resets the edited property to FALSE.

       The text is truncated to maxLength() length.

       Set this property's value with setText() and get this property's value with text().

bool undoAvailable
       This property holds whether undo is available.

       Get this property's value with isUndoAvailable().

SEE ALSO
       http://doc.trolltech.com/qlineedit.html http://www.trolltech.com/faq/tech.html

COPYRIGHT
       Copyright 1992-2001 Trolltech AS, http://www.trolltech.com.  See the license file included
       in the distribution for a complete license statement.

AUTHOR
       Generated automatically from the source code.

BUGS
       If you find a bug in Qt, please report it as described in
       http://doc.trolltech.com/bughowto.html.	Good bug reports help us to help you. Thank you.

       The definitive Qt documentation is provided in HTML format; it is located at
       $QTDIR/doc/html and can be read using Qt Assistant or with a web browser. This man page is
       provided as a convenience for those users who prefer man pages, although this format is
       not officially supported by Trolltech.

       If you find errors in this manual page, please report them to qt-bugs@trolltech.com.
       Please include the name of the manual page (qlineedit.3qt) and the Qt version (3.1.1).

Trolltech AS				 9 December 2002			   QLineEdit(3qt)


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