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, QList<QVariant> & args )
  35   {
  36     Q_UNUSED(args);
  37     QObject::connect( w, SIGNAL(painting(QPainter*)),
  38                       p, SLOT(customPaint(QPainter*)) );
  39   }
  40 };
  41
  42 static QcScrollWidgetFactory scrollWidgetFactory;
  43
  44 QcScrollWidget::QcScrollWidget( QWidget *parent ) : QcCanvas( parent )
  45 {
  46   setSizePolicy( QSizePolicy::Minimum, QSizePolicy::Minimum );
  47 }
  48
  49 QSize QcScrollWidget::sizeHint() const
  50 {
  51   QRect r = childrenRect();
  52   QSize sz( r.x() + r.width(), r.y() + r.height() );
  53   return sz;
  54 }
  55
  56 bool QcScrollWidget::event ( QEvent * e ) {
  57   int t = e->type();
  58   if( t == QEvent::ChildAdded ) {
  59     QChildEvent *ce = static_cast<QChildEvent*>(e);
  60     ce->child()->installEventFilter( this );
  61   }
  62   else if( t == QEvent::ChildRemoved ) {
  63     updateGeometry();
  64   }
  65
  66   return QWidget::event( e );
  67 }
  68
  69 bool QcScrollWidget::eventFilter ( QObject * watched, QEvent * event ) {
  70   Q_UNUSED( watched );
  71
  72   switch( event->type() ) {
  73     case QEvent::Resize:
  74     case QEvent::Move:
  75     case QEvent::Show:
  76     case QEvent::Hide:
  77       updateGeometry();
  78       break;
  79     default:
  80       return false;
  81   }
  82
  83   return false;
  84 }
  85
  86
  87
  88 static QcWidgetFactory<QcScrollArea> scrollAreaFactory;
  89
  90 QcScrollArea::QcScrollArea()
  91 {
  92
  93 }
  94
  95 void QcScrollArea::setWidget( QObjectProxy *proxy )
  96 {
  97   QWidget *w = qobject_cast<QWidget*>( proxy->object() );
  98   if( !w ) {
  99     qcErrorMsg( "QcScrollArea::setCanvas: given proxy does not contain a valid widget." );
 100     return;
 101   }
 102   QScrollArea::setWidget( w );
 103   setWidgetResizable( true );
 104 }
 105
 106 void QcScrollArea::addChild( QWidget* w )
 107 {
 108   if( widget() ) {
 109     w->setParent( widget() );
 110     w->show();
 111   }
 112 }
 113
 114 QRectF QcScrollArea::innerBounds() const {
 115   QSize vs = viewport()->size();
 116   if( !widget() ) return QRectF(0,0,vs.width(),vs.height());
 117   QSize cs = widget()->size();
 118   return QRectF(0, 0,
 119                 qMax( vs.width(), cs.width() ),
 120                 qMax( vs.height(), cs.height() ) );
 121 }
 122
 123 void QcScrollArea::setHasBorder( bool b ) {
 124   if( b )
 125     QFrame::setFrameShape( QFrame::StyledPanel );
 126   else
 127     QFrame::setFrameShape( QFrame::NoFrame );
 128 }
 129
 130 QPointF QcScrollArea::visibleOrigin() const
 131 {
 132   QWidget *w = widget();
 133   return ( w != 0 ? widget()->mapFromParent( QPoint(0,0) ) : QPoint(0,0) );
 134 }
 135
 136 void QcScrollArea::setVisibleOrigin( const QPointF &pt )
 137 {
 138   horizontalScrollBar()->setValue( pt.x() );
 139   verticalScrollBar()->setValue( pt.y() );
 140 }