QtCollider/widgets/QcScrollArea.cpp

   1 /************************************************************************
   2 *
   3 * Copyright 2010 Jakob Leben (jakob.leben@gmail.com)
   4 *
   5 * This file is part of SuperCollider Qt GUI.
   6 *
   7 * This program is free software: you can redistribute it and/or modify
   8 * it under the terms of the GNU General Public License as published by
   9 * the Free Software Foundation, either version 3 of the License, or
  10 * (at your option) any later version.
  11 *
  12 * This program is distributed in the hope that it will be useful,
  13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 * GNU General Public License for more details.
  16 *
  17 * You should have received a copy of the GNU General Public License
  18 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19 *
  20 ************************************************************************/
  21
  22 #include "QcScrollArea.h"
  23 #include "../QcWidgetFactory.h"
  24
  25 #include <QLayout>
  26 #include <QScrollBar>
  27 #include <QEvent>
  28 #include <QChildEvent>
  29 #include <QApplication>
  30
  31 class QcScrollWidgetFactory : public QcWidgetFactory<QcScrollWidget>
  32 {
  33 protected:
  34   virtual void initialize( QWidgetProxy *p, QcScrollWidget *w )
  35   {
  36     QObject::connect( w, SIGNAL(painting(QPainter*)),
  37                       p, SLOT(customPaint(QPainter*)) );
  38   }
  39 };
  40
  41 static QcScrollWidgetFactory scrollWidgetFactory;
  42
  43 QcScrollWidget::QcScrollWidget( QWidget *parent ) : QcCanvas( parent )
  44 {
  45   setSizePolicy( QSizePolicy::Minimum, QSizePolicy::Minimum );
  46 }
  47
  48 QSize QcScrollWidget::sizeHint() const
  49 {
  50   QRect r = childrenRect();
  51   QSize sz( r.x() + r.width(), r.y() + r.height() );
  52   return sz;
  53 }
  54
  55 bool QcScrollWidget::event ( QEvent * e ) {
  56   int t = e->type();
  57   if( t == QEvent::ChildAdded ) {
  58     QChildEvent *ce = static_cast<QChildEvent*>(e);
  59     ce->child()->installEventFilter( this );
  60   }
  61   else if( t == QEvent::ChildRemoved ) {
  62     updateGeometry();
  63   }
  64
  65   return QWidget::event( e );
  66 }
  67
  68 bool QcScrollWidget::eventFilter ( QObject * watched, QEvent * event ) {
  69   Q_UNUSED( watched );
  70
  71   switch( event->type() ) {
  72     case QEvent::Resize:
  73     case QEvent::Move:
  74     case QEvent::Show:
  75     case QEvent::Hide:
  76       updateGeometry();
  77       break;
  78     default:
  79       return false;
  80   }
  81
  82   return false;
  83 }
  84
  85
  86
  87 static QcWidgetFactory<QcScrollArea> scrollAreaFactory;
  88
  89 QcScrollArea::QcScrollArea()
  90 {
  91
  92 }
  93
  94 void QcScrollArea::setWidget( QObjectProxy *proxy )
  95 {
  96   QWidget *w = qobject_cast<QWidget*>( proxy->object() );
  97   if( !w ) {
  98     qcErrorMsg( "QcScrollArea::setCanvas: given proxy does not contain a valid widget." );
  99     return;
 100   }
 101   QScrollArea::setWidget( w );
 102   setWidgetResizable( true );
 103 }
 104
 105 void QcScrollArea::addChild( QWidget* w )
 106 {
 107   if( widget() ) {
 108     w->setParent( widget() );
 109     w->show();
 110   }
 111 }
 112
 113 QRectF QcScrollArea::innerBounds() const {
 114   QSize vs = viewport()->size();
 115   if( !widget() ) return QRectF(0,0,vs.width(),vs.height());
 116   QSize cs = widget()->size();
 117   return QRectF(0, 0,
 118                 qMax( vs.width(), cs.width() ),
 119                 qMax( vs.height(), cs.height() ) );
 120 }
 121
 122 void QcScrollArea::setHasBorder( bool b ) {
 123   if( b )
 124     QFrame::setFrameShape( QFrame::StyledPanel );
 125   else
 126     QFrame::setFrameShape( QFrame::NoFrame );
 127 }
 128
 129 QPointF QcScrollArea::visibleOrigin() const
 130 {
 131   QWidget *w = widget();
 132   return ( w != 0 ? widget()->mapFromParent( QPoint(0,0) ) : QPoint(0,0) );
 133 }
 134
 135 void QcScrollArea::setVisibleOrigin( const QPointF &pt )
 136 {
 137   horizontalScrollBar()->setValue( pt.x() );
 138   verticalScrollBar()->setValue( pt.y() );
 139 }