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# ksqueezedtextlabel.cpp

    00001 /* This file is part of the KDE libraries
    00002    Copyright (C) 2000 Ronny Standtke <Ronny.Standtke@gmx.de>
    00003
    00004    This library is free software; you can redistribute it and/or
    00005    modify it under the terms of the GNU Library General Public
    00006    License version 2 as published by the Free Software Foundation.
    00007
    00008    This library is distributed in the hope that it will be useful,
    00009    but WITHOUT ANY WARRANTY; without even the implied warranty of
    00010    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    00011    Library General Public License for more details.
    00012
    00013    You should have received a copy of the GNU Library General Public License
    00014    along with this library; see the file COPYING.LIB.  If not, write to
    00015    the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
    00016    Boston, MA 02111-1307, USA.
    00017 */
    00018
    00019 #include "ksqueezedtextlabel.h"
    00020 #include <qtooltip.h>
    00021
    00022 KSqueezedTextLabel::KSqueezedTextLabel( const QString &text , QWidget *parent, const char *name )
    00023  : QLabel ( parent, name ) {
    00024   setSizePolicy(QSizePolicy( QSizePolicy::Expanding, QSizePolicy::Fixed ));
    00025   fullText = text;
    00026   squeezeTextToLabel();
    00027 }
    00028
    00029 KSqueezedTextLabel::KSqueezedTextLabel( QWidget *parent, const char *name )
    00030  : QLabel ( parent, name ) {
    00031   setSizePolicy(QSizePolicy( QSizePolicy::Expanding, QSizePolicy::Fixed ));
    00032 }
    00033
    00034 void KSqueezedTextLabel::resizeEvent( QResizeEvent * ) {
    00035   squeezeTextToLabel();
    00036 }
    00037
    00038 QSize KSqueezedTextLabel::minimumSizeHint() const
    00039 {
    00040   QSize sh = QLabel::minimumSizeHint();
    00041   sh.setWidth(-1);
    00042   return sh;
    00043 }
    00044
    00045 void KSqueezedTextLabel::setText( const QString &text ) {
    00046   fullText = text;
    00047   squeezeTextToLabel();
    00048 }
    00049
    00050 void KSqueezedTextLabel::squeezeTextToLabel() {
    00051   QFontMetrics fm(fontMetrics());
    00052   int labelWidth = size().width();
    00053   int textWidth = fm.width(fullText);
    00054   if (textWidth > labelWidth) {
    00055     // start with the dots only
    00056     QString squeezedText = "...";
    00057     int squeezedWidth = fm.width(squeezedText);
    00058
    00059     // estimate how many letters we can add to the dots on both sides
    00060     int letters = fullText.length() * (labelWidth - squeezedWidth) / textWidth / 2;
    00061     if (labelWidth < squeezedWidth) letters=1;
    00062     squeezedText = fullText.left(letters) + "..." + fullText.right(letters);
    00063     squeezedWidth = fm.width(squeezedText);
    00064
    00065     if (squeezedWidth < labelWidth) {
    00066         // we estimated too short
    00067         // add letters while text < label
    00068         do {
    00069                 letters++;
    00070                 squeezedText = fullText.left(letters) + "..." + fullText.right(letters);
    00071                 squeezedWidth = fm.width(squeezedText);
    00072         } while (squeezedWidth < labelWidth);
    00073         letters--;
    00074         squeezedText = fullText.left(letters) + "..." + fullText.right(letters);
    00075     } else if (squeezedWidth > labelWidth) {
    00076         // we estimated too long
    00077         // remove letters while text > label
    00078         do {
    00079             letters--;
    00080             squeezedText = fullText.left(letters) + "..." + fullText.right(letters);
    00081             squeezedWidth = fm.width(squeezedText);
    00082         } while (letters && squeezedWidth > labelWidth);
    00083     }
    00084
    00085     if (letters < 5) {
    00086         // too few letters added -> we give up squeezing
    00087         QLabel::setText(fullText);
    00088     } else {
    00089         QLabel::setText(squeezedText);
    00090     }
    00091
    00092     QToolTip::remove( this );
    00093     QToolTip::add( this, fullText );
    00094
    00095   } else {
    00096     QLabel::setText(fullText);
    00097
    00098     QToolTip::remove( this );
    00099     QToolTip::hide();
    00100
    00101   };
    00102 }
    00103
    00104 void KSqueezedTextLabel::virtual_hook( int, void* )
    00105 { /*BASE::virtual_hook( id, data );*/ }
    00106
    00107 #include "ksqueezedtextlabel.moc"

This file is part of the documentation for kdelibs Version 3.1.5.
Documentation copyright © 1996-2002 the KDE developers.
Generated on Wed Jan 28 12:57:42 2004 by doxygen 1.3.4 written by Dimitri van Heesch, © 1997-2001