qlabel.3qt

Qt/Embedded是一个多平台的C++图形用户界面应用程序框架

.PP
Reimplemented from QFrame.
.SH "void QLabel::drawContentsMask ( QPainter * p ) \fC[virtual protected]\fR"
Draws the label contents mask using the painter \fIp.\fR Used only in transparent mode.
.PP
See also QWidget::setAutoMask();.
.PP
Reimplemented from QFrame.
.SH "void QLabel::fontChange ( const QFont & ) \fC[virtual protected]\fR"
Reimplemented for internal reasons; the API is not affected.
.PP
Reimplemented from QWidget.
.SH "bool QLabel::hasScaledContents () const"
Returns whether the label will scale its contents to fill all available space.
.PP
See also setScaledContents().
.SH "int QLabel::heightForWidth ( int w ) const \fC[virtual]\fR"
Reimplemented for internal reasons; the API is not affected.
.PP
Reimplemented from QWidget.
.SH "int QLabel::indent () const"
Returns the indent of the label.
.PP
See also setIndent().
.SH "QSize QLabel::minimumSizeHint () const \fC[virtual]\fR"
Reimplemented for internal reasons; the API is not affected.
.PP
Reimplemented from QWidget.
.SH "QMovie* QLabel::movie () const"
If the label contains a movie, returns a pointer to it. Otherwise, returns 0.
.PP
See also setMovie().
.SH "QPixmap * QLabel::pixmap () const"
If the label contains a pixmap, returns a pointer to it. Otherwise, returns 0.
.PP
See also setPixmap().
.SH "void QLabel::resizeEvent ( QResizeEvent * e ) \fC[virtual protected]\fR"
Reimplemented for internal reasons; the API is not affected.
.PP
Reimplemented from QWidget.
.SH "void QLabel::setAlignment ( int alignment ) \fC[virtual]\fR"
Sets the alignment of the label contents.
.PP
The \fIalignment\fR must be a bitwise OR of Qt::AlignmentFlags values. The \fCWordBreak, ExpandTabs, SingleLine\fR and \fCShowPrefix\fR flags apply only if the label contains a plain text, and are otherwise ignored. The \fCDontClip\fR flag is always ignored.
.PP
If the label has a buddy, the \fCShowPrefix\fR flag is forced to TRUE.
.PP
The default alignment is \fCAlignLeft | AlignVCenter | ExpandTabs\fR if the label doesn't have a buddy and \fCAlignLeft | AlignVCenter | ExpandTabs | ShowPrefix \fR if the label has a buddy.
.PP
See also Qt::AlignmentFlags, alignment(), setBuddy() and setText().
.PP
Examples:
.(l
cursor/cursor.cpp layout/layout.cpp popup/popup.cpp qmag/qmag.cpp customlayout/main.cpp
.)l
.SH "void QLabel::setAutoMask ( bool b ) \fC[virtual]\fR"
Reimplemented for internal reasons; the API is not affected.
.PP
Reimplemented from QWidget.
.SH "void QLabel::setAutoResize ( bool enable ) \fC[virtual]\fR"
\fBThis function is obsolete.\fR 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.
.PP
Enables auto-resizing if \fIenable\fR is TRUE, or disables it if \fIenable\fR is FALSE.
.PP
When auto-resizing is enabled, the label will resize itself to fit the contents whenever the contents change. The top left corner is not moved. This is useful for QLabel widgets that are not managed by a QLayout (e.g. top-level widgets).
.PP
Auto-resizing is disabled by default.
.PP
See also autoResize(), adjustSize() and sizeHint().
.SH "void QLabel::setBuddy ( QWidget * buddy ) \fC[virtual]\fR"
Sets the buddy of this label to \fIbuddy.\fR
.PP
When the user presses the accelerator key indicated by this label, the keyboard focus is transferred to the label's buddy widget.
.PP
The buddy mechanism is only available for QLabels that contain a plain text in which one letter is prefixed with '&'. It is this letter that is set as the accelerator key. The letter is displayed underlined, and the '&' is not displayed (i.e. the \fCShowPrefix\fR alignment flag is turned on; see setAlignment()).
.PP
In a dialog, you might create two data entry widgets and a label for each, and set up the geometry layout so each label is just to the left of its data entry widget (its "buddy"), somewhat like this:
.PP
.nf
.br
    QLineEdit *nameEd  = new QLineEdit( this );
.br
    QLabel    *nameLb  = new QLabel( "&Name:", this );
.br
    nameLb->setBuddy( nameEd );
.br
    QLineEdit *phoneEd = new QLineEdit( this );
.br
    QLabel    *phoneLb = new QLabel( "&Phone:", this );
.br
    phoneLb->setBuddy( phoneEd );
.br
    // ( layout setup not shown )
.fi
.PP
With the code above, the focus jumps to the Name field when the user presses Alt-N, and to the Phone field when the user presses Alt-P.
.PP
To unset a previously set buddy, call this function with \fIbuddy\fR set to 0.
.PP
See also buddy(), setText(), QAccel and setAlignment().
.SH "void QLabel::setIndent ( int indent )"
Sets the indent of the label to \fIindent\fR pixels.
.PP
The indent applies to the left edge if alignment() is \fCAlignLeft,\fR to the right edge if alignment() is \fCAlignRight,\fR to the top edge if alignment() is \fCAlignTop,\fR and to to the bottom edge if alignment() is \fCAlignBottom.\fR
.PP
If \fIindent\fR is negative, or if no indent has been set, the label computes the effective indent as follows: If frameWidth() is 0, the effective indent becomes 0. If frameWidth() is greater than 0, the effective indent becomes half the width of the "x" character of the widget's current font().
.PP
If \fIindent\fR is non-negative, the effective indent is \fIindent\fR pixels.
.PP
See also indent(), setAlignment(), frameWidth() and font().
.PP
Examples:
.(l
movies/main.cpp
.)l
.SH "void QLabel::setMovie ( const QMovie & movie ) \fC[virtual slot]\fR"
Sets the label contents to \fImovie.\fR Any previous content is cleared.
.PP
The buddy accelerator, if any, is disabled.
.PP
The label resizes itself if auto-resizing is enabled.
.PP
See also movie() and setBuddy().
.SH "void QLabel::setNum ( double num ) \fC[virtual slot]\fR"
Sets the label contents to a plain text containing the printed value of \fInum.\fR Does nothing if this is equal to the current contents of the label. Any previous content is cleared.
.PP
The buddy accelerator, if any, is disabled.
.PP
The label resizes itself if auto-resizing is enabled.
.PP
See also setText(), QString::setNum() and setBuddy().
.SH "void QLabel::setNum ( int num ) \fC[virtual slot]\fR"
Sets the label contents to a plain text containing the printed value of \fInum.\fR Does nothing if this is equal to the current contents of the label. Any previous content is cleared.
.PP
The buddy accelerator, if any, is disabled.
.PP
The label resizes itself if auto-resizing is enabled.
.PP
See also setText(), QString::setNum() and setBuddy().
.SH "void QLabel::setPixmap ( const QPixmap & pixmap ) \fC[virtual slot]\fR"
Sets the label contents to \fIpixmap.\fR Any previous content is cleared.
.PP
The buddy accelerator, if any, is disabled.
.PP
The label resizes itself if auto-resizing is enabled.
.PP
See also pixmap() and setBuddy().
.SH "void QLabel::setScaledContents ( bool enable )"
When called with \fIenable\fR == TRUE, and the label shows a pixmap, it will scale the pixmap to fill available space.
.PP
See also hasScaledContents().
.SH "void QLabel::setText ( const QString & text ) \fC[virtual slot]\fR"
Sets the label contents to \fItext,\fR or does nothing if \fItext\fR is equal to the current contents of the label. Any previous content is cleared.
.PP
\fItext\fR will be interpreted either as a plain text or as a rich text, depending on the text format setting; see setTextFormat(). The default setting is \fCAutoText,\fR i.e. QLabel will try to auto-detect the format of \fItext.\fR
.PP
If \fItext\fR is interpreted as a plain text, and a buddy has been set, the buddy accelerator key is updated from the new text.
.PP
The label resizes itself if auto-resizing is enabled.
.PP
Note that Qlabel is well suited to display small rich text documents only. For large documents, use QTextView instead. It will flicker less on resize and can also provide a scrollbar if necessary.
.PP
See also text(), setTextFormat(), setBuddy() and setAlignment().
.PP
Examples:
.(l
cursor/cursor.cpp layout/layout.cpp popup/popup.cpp qmag/qmag.cpp customlayout/main.cpp
.)l
.SH "void QLabel::setTextFormat ( Qt::TextFormat format )"
Sets the text format to \fIformat.\fR See the Qt::TextFormat enum for an explanation of the possible options.
.PP
The default format is \fCAutoText.\fR
.PP
See also textFormat() and setText().
.SH "QSize QLabel::sizeHint () const \fC[virtual]\fR"
Reimplemented for internal reasons; the API is not affected.
.PP
Examples:
.(l
layout/layout.cpp
.)l
.PP
Reimplemented from QWidget.
.SH "QSizePolicy QLabel::sizePolicy () const \fC[virtual]\fR"
Reimplemented for internal reasons; the API is not affected.
.PP
Reimplemented from QWidget.
.SH "QString QLabel::text () const"
Returns the label text. If the content is a plain or a rich text, this is the string that was passed to setText(). Otherwise, it is an empty/null string.
.PP
See also setText(), setNum() and clear().
.SH "Qt::TextFormat QLabel::textFormat() const"
Returns the current text format.
.PP
See also  setTextFormat().
.SH "SEE ALSO"
.BR http://doc.trolltech.com/qlabel.html
.SH COPYRIGHT
Copyright 1992-2000 Trolltech AS, http://www.trolltech.com/.  See the
license file included in the distribution for a complete license
statement.
.SH AUTHOR
Generated automatically from the source code.