kdeui

kurllabel.cpp

00001 /* This file is part of the KDE libraries
00002    Copyright (C) 1998 Kurt Granroth <granroth@kde.org>
00003    Copyright (C) 2000 Peter Putzer <putzer@kde.org>
00004    Copyright (C) 2005 Jaroslaw Staniek <js@iidea.pl>
00005 
00006    This library is free software; you can redistribute it and/or
00007    modify it under the terms of the GNU Library General Public
00008    License version 2 as published by the Free Software Foundation.
00009 
00010    This library is distributed in the hope that it will be useful,
00011    but WITHOUT ANY WARRANTY; without even the implied warranty of
00012    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00013    Library General Public License for more details.
00014 
00015    You should have received a copy of the GNU Library General Public License
00016    along with this library; see the file COPYING.LIB.  If not, write to
00017    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
00018    Boston, MA 02110-1301, USA.
00019 */
00020 
00021 #include <qcolor.h>
00022 #include <qtimer.h>
00023 #include <qtooltip.h>
00024 #include <qpixmap.h>
00025 #include <qpainter.h>
00026 #include <qstyle.h>
00027 #include <qapplication.h>
00028 
00029 #include <kcursor.h>
00030 #include <kglobalsettings.h>
00031 
00032 #include "kurllabel.h"
00033 
00034 class KURLLabel::Private
00035 {
00036 public:
00037   Private (const QString& url, KURLLabel* label)
00038     : URL (url),
00039       LinkColor (KGlobalSettings::linkColor()),
00040       HighlightedLinkColor (Qt::red),
00041       Tip(url),
00042       Cursor (0L),
00043       Underline (true),
00044       UseTips (false),
00045       Glow (true),
00046       Float (false),
00047       RealUnderline (true),
00048       MousePressed(false),
00049       WasInsideRect(false),
00050       MarginAltered(false),
00051       Timer (new QTimer (label))
00052   {
00053     connect (Timer, SIGNAL (timeout ()), label, SLOT (updateColor ()));
00054   }
00055 
00056   ~Private ()
00057   {
00058       delete Cursor;
00059   }
00060 
00061   QString URL;
00062   QPixmap AltPixmap;
00063 
00064   QColor LinkColor;
00065   QColor HighlightedLinkColor;
00066 
00067   QString Tip;
00068   QCursor* Cursor;
00069   bool Underline:1;
00070   bool UseTips:1;
00071   bool Glow:1;
00072   bool Float:1;
00073   bool RealUnderline:1;
00074   bool MousePressed:1;
00075   bool WasInsideRect:1;
00076   bool MarginAltered:1;
00077   QPixmap RealPixmap;
00078 
00079   QTimer* Timer;
00080 };
00081 
00082 KURLLabel::KURLLabel (const QString& url, const QString& text,
00083                         QWidget* parent, const char* name)
00084   : QLabel (!text.isNull() ? text : url, parent, name),
00085     d (new Private (url, this))
00086 {
00087   setFont (font());
00088   setUseCursor (true);
00089   setLinkColor (d->LinkColor);
00090   setFocusPolicy( QWidget::StrongFocus ); //better accessibility
00091   setMouseTracking (true);
00092 }
00093 
00094 KURLLabel::KURLLabel (QWidget* parent, const char* name)
00095   : QLabel (parent, name),
00096     d (new Private (QString::null, this))
00097 {
00098   setFont (font());
00099   setUseCursor (true);
00100   setLinkColor (d->LinkColor);
00101   setFocusPolicy( QWidget::StrongFocus ); //better accessibility
00102   setMouseTracking (true);
00103 }
00104 
00105 KURLLabel::~KURLLabel ()
00106 {
00107   delete d;
00108 }
00109 
00110 void KURLLabel::mouseReleaseEvent (QMouseEvent* e)
00111 {
00112   QLabel::mouseReleaseEvent (e);
00113   if (!d->MousePressed)
00114     return;
00115   d->MousePressed = false;
00116   QRect r( activeRect() );
00117   if (!r.contains(e->pos()))
00118     return;
00119 
00120   setLinkColor (d->HighlightedLinkColor);
00121   d->Timer->start (300);
00122 
00123   switch (e->button())
00124     {
00125     case LeftButton:
00126       emit leftClickedURL ();
00127       emit leftClickedURL (d->URL);
00128       break;
00129 
00130     case MidButton:
00131       emit middleClickedURL ();
00132       emit middleClickedURL (d->URL);
00133       break;
00134 
00135     case RightButton:
00136       emit rightClickedURL ();
00137       emit rightClickedURL (d->URL);
00138       break;
00139 
00140     default:
00141       ; // nothing
00142     }
00143 }
00144 
00145 void KURLLabel::setFont (const QFont& f)
00146 {
00147   QFont newFont = f;
00148   newFont.setUnderline (d->Underline);
00149 
00150   QLabel::setFont (newFont);
00151 }
00152 
00153 void KURLLabel::setUnderline (bool on)
00154 {
00155   d->Underline = on;
00156 
00157   setFont (font());
00158 }
00159 
00160 void KURLLabel::updateColor ()
00161 {
00162   d->Timer->stop();
00163 
00164   QRect r( activeRect() );
00165   if (!(d->Glow || d->Float) || !r.contains (mapFromGlobal(QCursor::pos())))
00166     setLinkColor (d->LinkColor);
00167 }
00168 
00169 void KURLLabel::setLinkColor (const QColor& col)
00170 {
00171   QPalette p = palette();
00172   p.setColor (QColorGroup::Foreground, col);
00173   setPalette (p);
00174 
00175   update();
00176 }
00177 
00178 void KURLLabel::setURL (const QString& url)
00179 {
00180   if ( d->Tip == d->URL ) { // update the tip as well
00181     d->Tip = url;
00182     setUseTips( d->UseTips );
00183   }
00184 
00185   d->URL = url;
00186 }
00187 
00188 const QString& KURLLabel::url () const
00189 {
00190   return d->URL;
00191 }
00192 
00193 void KURLLabel::unsetCursor ()
00194 {
00195     delete d->Cursor;
00196     d->Cursor = 0;
00197 }
00198 
00199 void KURLLabel::setCursor ( const QCursor& cursor )
00200 {
00201     delete d->Cursor;
00202     d->Cursor = new QCursor( cursor );
00203 }
00204 
00205 void KURLLabel::setUseCursor (bool on, QCursor* cursor)
00206 {
00207   if (on)
00208     {
00209       if (cursor)
00210         KURLLabel::setCursor (*cursor);
00211       else
00212         KURLLabel::setCursor (KCursor::handCursor());
00213     }
00214   else
00215     KURLLabel::unsetCursor ();
00216 }
00217 
00218 bool KURLLabel::useCursor () const
00219 {
00220   return d->Cursor;
00221 }
00222 
00223 void KURLLabel::setUseTips (bool on)
00224 {
00225   d->UseTips = on;
00226 
00227   if (on) {
00228     QToolTip::add (this, activeRect(), d->Tip);
00229   } else
00230     QToolTip::remove (this);
00231 }
00232 
00233 void KURLLabel::setTipText (const QString& tip)
00234 {
00235   d->Tip = tip;
00236 
00237   setUseTips (d->UseTips);
00238 }
00239 
00240 bool KURLLabel::useTips () const
00241 {
00242   return d->UseTips;
00243 }
00244 
00245 const QString& KURLLabel::tipText () const
00246 {
00247   return d->Tip;
00248 }
00249 
00250 void KURLLabel::setHighlightedColor (const QColor& highcolor)
00251 {
00252   d->LinkColor = highcolor;
00253 
00254   if (!d->Timer->isActive())
00255     setLinkColor (highcolor);
00256 }
00257 
00258 void KURLLabel::setHighlightedColor (const QString& highcolor)
00259 {
00260   setHighlightedColor (QColor (highcolor));
00261 }
00262 
00263 void KURLLabel::setSelectedColor (const QColor& selcolor)
00264 {
00265   d->HighlightedLinkColor = selcolor;
00266 
00267   if (d->Timer->isActive())
00268     setLinkColor (selcolor);
00269 }
00270 
00271 void KURLLabel::setSelectedColor (const QString& selcolor)
00272 {
00273   setSelectedColor (QColor (selcolor));
00274 }
00275 
00276 void KURLLabel::setGlow (bool glow)
00277 {
00278   d->Glow = glow;
00279 }
00280 
00281 void KURLLabel::setFloat (bool do_float)
00282 {
00283   d->Float = do_float;
00284 }
00285 
00286 bool KURLLabel::isGlowEnabled () const
00287 {
00288   return d->Glow;
00289 }
00290 
00291 bool KURLLabel::isFloatEnabled () const
00292 {
00293   return d->Float;
00294 }
00295 
00296 void KURLLabel::setAltPixmap (const QPixmap& altPix)
00297 {
00298   d->AltPixmap = altPix;
00299 }
00300 
00301 const QPixmap* KURLLabel::altPixmap () const
00302 {
00303   return &d->AltPixmap;
00304 }
00305 
00306 void KURLLabel::enterEvent (QEvent* e)
00307 {
00308   QLabel::enterEvent (e);
00309 
00310   QRect r( activeRect() );
00311   if (!r.contains( static_cast<QMouseEvent*>(e)->pos() ))
00312     return;
00313 
00314   if (!d->AltPixmap.isNull() && pixmap())
00315     {
00316       d->RealPixmap = *pixmap();
00317       setPixmap (d->AltPixmap);
00318     }
00319 
00320   if (d->Glow || d->Float)
00321     {
00322       d->Timer->stop();
00323 
00324       setLinkColor (d->HighlightedLinkColor);
00325 
00326       d->RealUnderline = d->Underline;
00327 
00328       if (d->Float)
00329         setUnderline (true);
00330     }
00331 
00332   emit enteredURL ();
00333   emit enteredURL (d->URL);
00334 }
00335 
00336 void KURLLabel::leaveEvent (QEvent* e)
00337 {
00338   QLabel::leaveEvent (e);
00339 
00340   if (!d->AltPixmap.isNull() && pixmap())
00341     setPixmap (d->RealPixmap);
00342 
00343   if ((d->Glow || d->Float) && !d->Timer->isActive())
00344     setLinkColor (d->LinkColor);
00345 
00346   setUnderline (d->RealUnderline);
00347 
00348   emit leftURL ();
00349   emit leftURL (d->URL);
00350 }
00351 
00352 bool KURLLabel::event (QEvent *e)
00353 {
00354   if (e && e->type() == QEvent::ParentPaletteChange)
00355   {
00356     // use parentWidget() unless you are a toplevel widget, then try qAapp
00357     QPalette p = parentWidget() ? parentWidget()->palette() : qApp->palette();
00358     p.setBrush(QColorGroup::Base, p.brush(QPalette::Normal, QColorGroup::Background));
00359     p.setColor(QColorGroup::Foreground, palette().active().foreground());
00360     setPalette(p);
00361     d->LinkColor = KGlobalSettings::linkColor();
00362     setLinkColor(d->LinkColor);
00363     return true;
00364   }
00365   else if (e->type() == QEvent::Paint) {
00366     const bool result = QLabel::event(e);
00367     if (result && hasFocus()) {
00368         QPainter p(this);
00369         QRect r( activeRect() );
00370         style().drawPrimitive( QStyle::PE_FocusRect, &p, r, colorGroup() );
00371     }
00372     return result;
00373   }
00374   else if (e->type() == QEvent::KeyPress) {
00375     QKeyEvent* ke = static_cast<QKeyEvent*>(e);
00376     if (ke->key() == Qt::Key_Enter || ke->key() == Qt::Key_Return) {
00377       setLinkColor (d->HighlightedLinkColor);
00378       d->Timer->start (300);
00379       emit leftClickedURL ();
00380       emit leftClickedURL (d->URL);
00381       ke->accept();
00382       return true;
00383     }
00384   }
00385   else if (e->type() == QEvent::MouseButtonPress) {
00386     QRect r( activeRect() );
00387     d->MousePressed = r.contains(static_cast<QMouseEvent*>(e)->pos());
00388   }
00389   else if (e->type() == QEvent::MouseMove) {
00390     if (d->Cursor) {
00391       QRect r( activeRect() );
00392       bool inside = r.contains(static_cast<QMouseEvent*>(e)->pos());
00393       if (d->WasInsideRect != inside) {
00394         if (inside)
00395           QLabel::setCursor(*d->Cursor);
00396         else
00397           QLabel::unsetCursor();
00398         d->WasInsideRect = inside;
00399       }
00400     }
00401   }
00402   return QLabel::event(e);
00403 }
00404 
00405 QRect KURLLabel::activeRect() const
00406 {
00407   QRect r( contentsRect() );
00408   if (text().isEmpty() || (!d->MarginAltered && sizePolicy() == QSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed)))
00409       return r; //fixed size is sometimes used with pixmap
00410   int hAlign = QApplication::horizontalAlignment( alignment() );
00411   int indentX = (hAlign && indent()>0) ? indent() : 0;
00412   QFontMetrics fm(font());
00413   r.setWidth( QMIN(fm.width(text()), r.width()));
00414   if ( hAlign & AlignLeft )
00415       r.moveLeft(r.left() + indentX);
00416   if ( hAlign & AlignCenter )
00417       r.moveLeft((contentsRect().width()-r.width())/2+margin());
00418   if ( hAlign & AlignRight )
00419       r.moveLeft(contentsRect().width()-r.width()-indentX+margin());
00420   int add = QMIN(3, margin());
00421   r = QRect(r.left()-add, r.top()-add, r.width()+2*add, r.height()+2*add);
00422   return r;
00423 }
00424 
00425 void KURLLabel::setMargin( int margin )
00426 {
00427   QLabel::setMargin(margin);
00428   d->MarginAltered = true;
00429 }
00430 
00431 void KURLLabel::setFocusPolicy( FocusPolicy policy )
00432 {
00433   QLabel::setFocusPolicy(policy);
00434   if (!d->MarginAltered) {
00435       QLabel::setMargin(policy == NoFocus ? 0 : 3); //better default : better look when focused
00436   }
00437 }
00438 
00439 void KURLLabel::setSizePolicy ( QSizePolicy policy )
00440 {
00441   QLabel::setSizePolicy(policy);
00442   if (!d->MarginAltered && policy.horData()==QSizePolicy::Fixed && policy.verData()==QSizePolicy::Fixed) {
00443       QLabel::setMargin(0); //better default : better look when fixed size
00444   }
00445 }
00446 
00447 void KURLLabel::virtual_hook( int, void* )
00448 { /*BASE::virtual_hook( id, data );*/ }
00449 
00450 #include "kurllabel.moc"
kdeui

kurllabel.cpp

kdeui

API Reference
