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PhotoViewWidget Class Reference

#include <photoViewWidget.h>

List of all members.

Detailed Description

Display widget for photos. Used by the PhotoEditWidget.

Definition at line 33 of file photoViewWidget.h.

Public Member Functions

 PhotoViewWidget (QWidget *parent=0, const char *name=0)
 Creates layout.

 ~PhotoViewWidget ()
 Deletes objects.

void setPhoto (Photo *photo)
 Updates displayed photo.

void getSelection (QPoint &topLeft, QPoint &bottomRight)
 Returns the current selected coordinates (actual slideshow image space, aka not including buffered whitespace or widget offsets).


Protected Member Functions

void paintEvent (QPaintEvent *e)
void mousePressEvent (QMouseEvent *e)
void mouseReleaseEvent (QMouseEvent *)
void mouseMoveEvent (QMouseEvent *e)
void keyReleaseEvent (QKeyEvent *e)

Private Slots

void selectAll ()

Private Member Functions

QPoint cropSelectedPoint (QPoint p)
 crops a selected point to within the photo


Private Attributes

QPixmap * photo
 Photo pixmap.

Photo * photoObject
 Photo object handle.

QPoint * corner1
 first corner of selection, where mouse first clicked

QPoint * corner2
 second corner of selection, where mouse moved to

bool currentlyDragging
 currently dragging out selection, handle mouse move events

Constructor & Destructor Documentation

PhotoViewWidget::PhotoViewWidget (  QWidget *  parent = 0,
const char *  name = 0
) 
 

Creates layout.

Definition at line 30 of file photoViewWidget.cpp.

References corner1, corner2, currentlyDragging, photo, photoObject, and selectAll(). 

00031                                                                       : 
00032                                                    QWidget(parent,name)
00033 {
00034   photo = NULL;
00035   setPaletteBackgroundColor( QColor(255, 255, 255) );
00036   setMinimumSize(600, 400);
00037   
00038   //set default selection off screen
00039   corner1 = new QPoint(-1, -1);
00040   corner2 = new QPoint(-1, -1);
00041   
00042   //by default not in drag mode
00043   currentlyDragging = false;
00044   
00045   //no photo set yet
00046   photoObject = NULL;
00047   
00048   QAccel *keyAccel = new QAccel( this );
00049   keyAccel->connectItem( keyAccel->insertItem( CTRL + Key_A),
00050                                       this, SLOT(selectAll()) );
00051 }

PhotoViewWidget::~PhotoViewWidget (   ) 
 

Deletes objects.

Definition at line 53 of file photoViewWidget.cpp.

References photo. 

00054 {
00055   delete photo;
00056   photo = NULL;
00057 }

Member Function Documentation

QPoint PhotoViewWidget::cropSelectedPoint (  QPoint  p  )  [private]
 

crops a selected point to within the photo

Definition at line 187 of file photoViewWidget.cpp.

References Photo::actualSlideshowHeight(), Photo::actualSlideshowWidth(), and photoObject.

Referenced by mouseMoveEvent(), and mousePressEvent(). 

00188 {
00189   int newX = p.x();
00190   int newY = p.y();
00191   
00192   int minXAllow, maxXAllow, minYAllow, maxYAllow;
00193   int xdiff, ydiff;
00194     
00195   xdiff = width() - photoObject->actualSlideshowWidth();
00196   ydiff = height() - photoObject->actualSlideshowHeight();
00197 
00198   minXAllow = xdiff/2;
00199   minYAllow = ydiff/2;
00200   
00201   maxXAllow = minXAllow + photoObject->actualSlideshowWidth() - 1;
00202   maxYAllow = minYAllow + photoObject->actualSlideshowHeight() - 1;
00203 
00204   if(newX < minXAllow)
00205     newX = minXAllow;
00206   if(newX > maxXAllow)
00207     newX = maxXAllow;
00208   if(newY < minYAllow)
00209     newY = minYAllow;
00210   if(newY > maxYAllow)
00211     newY = maxYAllow;
00212   
00213   return QPoint(newX, newY);
00214 }

void PhotoViewWidget::getSelection (  QPoint &  topLeft,
QPoint &  bottomRight
) 
 

Returns the current selected coordinates (actual slideshow image space, aka not including buffered whitespace or widget offsets).

Definition at line 237 of file photoViewWidget.cpp.

References Photo::actualSlideshowHeight(), Photo::actualSlideshowWidth(), corner1, corner2, and photoObject.

Referenced by PhotoEditWidget::cropToRegion(), and PhotoEditWidget::invertSelection(). 

00238 {
00239   //if none selected just return that
00240   if(corner1->x() == -1)
00241   {
00242     topLeft.setX(corner1->x());
00243     topLeft.setY(corner1->y());
00244     bottomRight.setX(corner2->x());
00245     bottomRight.setY(corner2->y());
00246     return;
00247   }
00248 
00249   //--
00250   //set coordinates based on raw selection
00251   //--
00252   if(corner1->x() < corner2->x())
00253   {
00254     topLeft.setX( corner1->x() );
00255     bottomRight.setX( corner2->x() );
00256   }
00257   else
00258   {
00259     topLeft.setX( corner2->x() );
00260     bottomRight.setX( corner1->x() );
00261   }
00262   //--
00263   if(corner1->y() < corner2->y())
00264   {
00265     topLeft.setY( corner1->y() );
00266     bottomRight.setY( corner2->y() );
00267   }
00268   else
00269   {
00270     topLeft.setY( corner2->y() );
00271     bottomRight.setY( corner1->y() );
00272   }
00273   //--
00274   //subtract offsets from coordinates
00275   int xbuff = (width() - photoObject->actualSlideshowWidth()) / 2;
00276   int ybuff = (height() - photoObject->actualSlideshowHeight()) / 2;
00277   topLeft.setX( topLeft.x() - xbuff );
00278   topLeft.setY( topLeft.y() - ybuff );
00279   bottomRight.setX( bottomRight.x() - xbuff );
00280   bottomRight.setY( bottomRight.y() - ybuff );
00281   //--
00282 }

void PhotoViewWidget::keyReleaseEvent (  QKeyEvent *  e  )  [protected]
 

Definition at line 151 of file photoViewWidget.cpp. 

00152 {
00153   cout << "Key Pressed: " << e->ascii() << endl;
00154 }

void PhotoViewWidget::mouseMoveEvent (  QMouseEvent *  e  )  [protected]
 

Definition at line 170 of file photoViewWidget.cpp.

References corner2, cropSelectedPoint(), and currentlyDragging. 

00171 {
00172   if(!currentlyDragging)
00173     return;
00174     
00175   QPoint p = cropSelectedPoint(e->pos());
00176   corner2->setX( p.x() );
00177   corner2->setY( p.y() );
00178   
00179   repaint(false);
00180 }

void PhotoViewWidget::mousePressEvent (  QMouseEvent *  e  )  [protected]
 

Definition at line 156 of file photoViewWidget.cpp.

References corner1, corner2, cropSelectedPoint(), currentlyDragging, and photo. 

00157 {
00158   if(photo == NULL)
00159     return;
00160     
00161   currentlyDragging = true;
00162   QPoint p = cropSelectedPoint(e->pos());
00163   corner1->setX( p.x() );
00164   corner1->setY( p.y() );
00165   corner2->setX( corner1->x() );
00166   corner2->setY( corner1->y() );
00167   repaint(false);
00168 }

void PhotoViewWidget::mouseReleaseEvent (  QMouseEvent *   )  [protected]
 

Definition at line 182 of file photoViewWidget.cpp.

References currentlyDragging. 

00183 {
00184   currentlyDragging = false;
00185 }

void PhotoViewWidget::paintEvent (  QPaintEvent *  e  )  [protected]
 

Definition at line 80 of file photoViewWidget.cpp.

References corner1, corner2, and photo. 

00081 {  
00082     //if no photo just paint white
00083     if(photo == NULL)
00084     {
00085       QPainter p;
00086       p.begin(this);
00087       p.fillRect(e->rect(), Qt::white);
00088       p.end();
00089       return;
00090     }
00091     
00092     //create buffer to draw in
00093     QRect rct = rect();
00094     rct.moveBy(-x(), -y());
00095     QPixmap buffer( size() );
00096     
00097     //create a painter pointing to the buffer
00098     QPainter bufferPainter( &buffer );
00099 
00100     //first flood entire region with white
00101     buffer.fill( white );
00102     
00103     //next paint the image
00104     QRect pr(0, 0, photo->width(), photo->height());
00105     bufferPainter.drawPixmap(pr, *photo);
00106     
00107     //next draw selection rectangle
00108     int xmin, xmax, ymin, ymax;
00109     
00110     if(corner1->x() < corner2->x())
00111       xmin = corner1->x();
00112     else
00113       xmin = corner2->x();
00114     if(corner1->x() > corner2->x())
00115       xmax = corner1->x();
00116     else
00117       xmax = corner2->x();
00118     if(corner1->y() < corner2->y())
00119       ymin = corner1->y();
00120     else
00121       ymin = corner2->y();
00122     if(corner1->y() > corner2->y())
00123       ymax = corner1->y();
00124     else
00125       ymax = corner2->y();
00126       
00127     QRect selection( xmin, ymin, xmax-xmin+1, ymax-ymin+1 );
00128     
00129     //construct a pen for selection drawing purposes
00130     QPen selectionPen;
00131 
00132     //draw selection in white    
00133     selectionPen.setStyle( Qt::SolidLine );
00134     selectionPen.setColor( white );
00135     bufferPainter.setPen( selectionPen);
00136     bufferPainter.drawRect(selection); 
00137     
00138     //draw selection a second time with dashed black, thus 
00139     //producing an alternating black-white selection rectangle
00140     selectionPen.setStyle( Qt::DotLine );
00141     selectionPen.setColor( black );
00142     bufferPainter.setPen( selectionPen);
00143     bufferPainter.drawRect(selection); 
00144     
00145     bufferPainter.end();
00146     
00147     //paint buffer to widget
00148     bitBlt( this, e->rect().topLeft(), &buffer, e->rect() );
00149 }

void PhotoViewWidget::selectAll (   )  [private, slot]
 

Definition at line 216 of file photoViewWidget.cpp.

References Photo::actualSlideshowHeight(), Photo::actualSlideshowWidth(), corner1, corner2, and photoObject.

Referenced by PhotoViewWidget(). 

00217 {
00218   int minXAllow, maxXAllow, minYAllow, maxYAllow;
00219   int xdiff, ydiff;
00220     
00221   xdiff = width() - photoObject->actualSlideshowWidth();
00222   ydiff = height() - photoObject->actualSlideshowHeight();
00223 
00224   minXAllow = xdiff/2;
00225   minYAllow = ydiff/2;  
00226   maxXAllow = minXAllow + photoObject->actualSlideshowWidth() - 1;
00227   maxYAllow = minYAllow + photoObject->actualSlideshowHeight() - 1;
00228 
00229   corner1->setX( minXAllow );
00230   corner1->setY( minYAllow );
00231   corner2->setX( maxXAllow );
00232   corner2->setY( maxYAllow );
00233 
00234   repaint(false);
00235 }

void PhotoViewWidget::setPhoto (  Photo *  photo  ) 
 

Updates displayed photo.

Definition at line 59 of file photoViewWidget.cpp.

References corner1, corner2, Photo::getSlideshowFilename(), photo, and photoObject.

Referenced by PhotoEditWidget::adjustExposure(), PhotoEditWidget::cropToRegion(), PhotoEditWidget::invertSelection(), PhotoEditWidget::resetImageAction(), and PhotoEditWidget::setPhoto(). 

00060 {
00061   //delete pixmap
00062   delete photo;
00063   
00064   //construct new pixmap
00065   photo = new QPixmap(phto->getSlideshowFilename());  
00066   
00067   //save photo object handle
00068   photoObject = phto;
00069   
00070   //reset selection area to nothing
00071   corner1->setX(-1); 
00072   corner1->setY(-1);
00073   corner2->setX(-1); 
00074   corner2->setY(-1);
00075   
00076   //repaint
00077   repaint(false);
00078 }

Member Data Documentation

QPoint* PhotoViewWidget::corner1 [private]
 

first corner of selection, where mouse first clicked

Definition at line 73 of file photoViewWidget.h.

Referenced by getSelection(), mousePressEvent(), paintEvent(), PhotoViewWidget(), selectAll(), and setPhoto().

QPoint* PhotoViewWidget::corner2 [private]
 

second corner of selection, where mouse moved to

Definition at line 76 of file photoViewWidget.h.

Referenced by getSelection(), mouseMoveEvent(), mousePressEvent(), paintEvent(), PhotoViewWidget(), selectAll(), and setPhoto().

bool PhotoViewWidget::currentlyDragging [private]
 

currently dragging out selection, handle mouse move events

Definition at line 79 of file photoViewWidget.h.

Referenced by mouseMoveEvent(), mousePressEvent(), mouseReleaseEvent(), and PhotoViewWidget().

QPixmap* PhotoViewWidget::photo [private]
 

Photo pixmap.

Definition at line 67 of file photoViewWidget.h.

Referenced by mousePressEvent(), paintEvent(), PhotoViewWidget(), setPhoto(), and ~PhotoViewWidget().

Photo* PhotoViewWidget::photoObject [private]
 

Photo object handle.

Definition at line 70 of file photoViewWidget.h.

Referenced by cropSelectedPoint(), getSelection(), PhotoViewWidget(), selectAll(), and setPhoto().

The documentation for this class was generated from the following files:
Generated on Tue Jun 10 23:41:23 2003 for AlbumShaper by doxygen 1.3.1