subalbumsIconView.cpp

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//==============================================
//  copyright            : (C) 2003-2005 by Will Stokes
//==============================================
//  This program is free software; you can redistribute it
//  and/or modify it under the terms of the GNU General
//  Public License as published by the Free Software
//  Foundation; either version 2 of the License, or
//  (at your option) any later version.
//==============================================
 
//Systemwide includes
#include <qpixmap.h>
#include <qimage.h>
#include <qpainter.h>
#include <qcursor.h>
#include <qapplication.h>
//Added by qt3to4:
#include <QDropEvent>
#include <QMouseEvent>
#include <QDragMoveEvent>
 
//#include <qscrollbar.h>
 
//Projectwide includes
#include "subalbumsIconView.h"
#include "subalbumPreviewWidget.h"
#include "layoutWidget.h"
#include "subalbumWidget.h"
#include "photoPreviewWidget.h"
 
//==============================================
SubalbumsIconView::SubalbumsIconView( QWidget *parent ) : Q3IconView( parent )
{
//  setSizePolicy( QSizePolicy::Minimum, QSizePolicy::Minimum);
  setMouseTracking(true);
 
  currentPseudoSelection = NULL;
 
  //connect mouse over events to paint pseudo selection in ligher blue
  connect( this, SIGNAL(onItem(Q3IconViewItem*)),
                this, SLOT(repaintGroup(Q3IconViewItem*)) );
 
  //clear any pseudo selection when mouse moves off icons
  connect( this, SIGNAL(onViewport()),
                this, SLOT(clearPseudoSelection()) );
 
  //compute textWidth for collection names using a calibration string
  QString calibrationString( qApp->translate("SubalbumPreviewWidget", "Calibration String") );
  QFontMetrics fm( qApp->font() );
  textWidth = fm.width( calibrationString );
}
//==============================================
void SubalbumsIconView::contentsDropEvent( QDropEvent *e )
{
  Q3IconView::contentsDropEvent( e );
 
   //if drop originated from this viewport then emit item moved signal
  if(e->source() == viewport() )
    emit itemHasMoved();
}
//==============================================
 void SubalbumsIconView::drawContents ( QPainter * p, int clipx, int clipy, int clipw, int cliph )
{
    if( bufferPixmap.size() != size())
    {  bufferPixmap.resize( size() ); }
    QPainter bufferPainter( &bufferPixmap );
    int xOffset = clipx - contentsX();
    int yOffset = clipy - contentsY();
 
    bufferPainter.translate( -contentsX(), -contentsY() );
    Q3IconView::drawContents( &bufferPainter, clipx, clipy, clipw, cliph );
    bitBlt(p->device(), xOffset, yOffset, &bufferPixmap, xOffset, yOffset, clipw, cliph );
}
//==============================================
void SubalbumsIconView::contentsMousePressEvent ( QMouseEvent * e )
{
  //ignore all clicks other than left-clicks
  if( e->button() != Qt::LeftButton ) return;
 
  dragStartPos = e->pos();
  Q3IconView::contentsMousePressEvent( e );
}
//==============================================
Q3DragObject* SubalbumsIconView::dragObject()
{
  //no item selected?
  if( !currentItem() )
    return 0;
 
  //create drag object
  Q3IconDrag *drag = new Q3IconDrag( viewport() );
 
  //create buffer and paint item to buffer
  QRect r = currentItem()->rect();
  QPixmap buffer( r.width(), r.height() );
  QPainter painter( &buffer );
  painter.translate( -r.x(), -r.y() );
  ((SubalbumPreviewWidget*)currentItem())->paint( &painter );
 
  //clip off background color around edges which was used for anti-aliasing edges.
  //result image will have semi-selection oval around it.
  QBitmap bit = buffer.createHeuristicMask();
  buffer.setMask( bit );
 
  //set pixmap to use buffer
  drag->setPixmap( buffer, QPoint( dragStartPos.x() - r.x(), dragStartPos.y() - r.y() ) );
 
  //we don't want to show any rectangles, but if we don't append two null rectangles the last drag rectangles this iconview displayed
  //possibly form objects dropped onto it from outside the viewport, aka photos, will be drawn! :(
  drag->append( Q3IconDragItem(), QRect(), QRect() );
 
  return drag;
}
//==============================================
void SubalbumsIconView::contentsDragMoveEvent( QDragMoveEvent* e )
{
  Q3IconView::contentsDragMoveEvent( e );
   e->accept(true);
 
   //if source of drag is not from application then return
   if(e->source() == NULL)
     return;
 
  //if source of drag is from within this view then return, in the future we'll put
  //drag code in here to drag indicators for rearranging the items of the iconview
  if(e->source() == viewport() )
  {
 
  }
  //else if source is from photos iconview
  else if(e->source()->parentWidget() == ((LayoutWidget*)parentWidget()->parentWidget())->getSubalbum()->getPhotos() )
  {
    SubalbumPreviewWidget* item = (SubalbumPreviewWidget*)findItem( e->pos() );
 
    //if item pointer same as current pseudo selection ignore
    if(item == currentPseudoSelection)
    {
      return;
    }
 
    //unpaint old selection
    if(currentPseudoSelection != NULL)
    {
      currentPseudoSelection->setMousedOver(false);
      repaintItem(currentPseudoSelection);
    }
 
    //set new selection
    currentPseudoSelection = item;
 
    //repaint new selection
    if(currentPseudoSelection != NULL)
    {
      currentPseudoSelection->setMousedOver(true);
      repaintItem(currentPseudoSelection);
    }
  }
}
//==============================================
void SubalbumsIconView::repaintGroup( Q3IconViewItem* pseudoSelection)
{
  //if old pseudo selection unselect it
  clearPseudoSelection();
 
  //paint new selection
  currentPseudoSelection = (SubalbumPreviewWidget*)pseudoSelection;
  currentPseudoSelection->setMousedOver(true);
  repaintItem(currentPseudoSelection);
}
//==============================================
void SubalbumsIconView::clearPseudoSelection()
{
  //if old pseudo selection unselect it
  if(currentPseudoSelection != NULL)
  {
    currentPseudoSelection->setMousedOver(false);
    repaintItem(currentPseudoSelection);
    currentPseudoSelection = NULL;
  }
}
//==============================================
int SubalbumsIconView::getTextWidth()
{ return textWidth; }
//==============================================
QSize SubalbumsIconView::minimumSizeHint() const { return sizeHint(); }
//==============================================
QSize SubalbumsIconView::sizeHint() const
{
  QSize s = Q3IconView::sizeHint();
  
  //find max item width
  s.setWidth(0);
  Q3IconViewItem *item;
  for( item = firstItem(); item != NULL; item = item->nextItem() )
  {
    if(item->width() > s.width() )
      s.setWidth( item->width() );
  } 
  s.setWidth( s.width() + 2*spacing() + verticalScrollBar()->sizeHint().width() );
  return s;
}
//==============================================