PhotoViewWidget Class Reference

#include <photoViewWidget.h>

Inheritance diagram for PhotoViewWidget:

[legend]Collaboration diagram for PhotoViewWidget:

[legend]List of all members.

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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)
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

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Constructor & Destructor Documentation

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

Creates layout. Definition at line 28 of file photoViewWidget.cpp. References corner1, corner2, currentlyDragging, photo, photoObject, and selectAll(). : QWidget(parent,name) { photo = NULL; setPaletteBackgroundColor( QColor(255, 255, 255) ); setMinimumSize(600, 400); //set default selection off screen corner1 = new QPoint(-1, -1); corner2 = new QPoint(-1, -1); //by default not in drag mode currentlyDragging = false; //no photo set yet photoObject = NULL; QAccel *keyAccel = new QAccel( this ); keyAccel->connectItem( keyAccel->insertItem( CTRL + Key_A), this, SLOT(selectAll()) ); }

PhotoViewWidget::~PhotoViewWidget (   )

Deletes objects. Definition at line 51 of file photoViewWidget.cpp. References photo. { delete photo; photo = NULL; }

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Member Function Documentation

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

crops a selected point to within the photo Definition at line 180 of file photoViewWidget.cpp. References Photo::actualSlideshowHeight(), Photo::actualSlideshowWidth(), and photoObject. Referenced by mouseMoveEvent(), and mousePressEvent(). { int newX = p.x(); int newY = p.y(); int minXAllow, maxXAllow, minYAllow, maxYAllow; int xdiff, ydiff; xdiff = width() - photoObject->actualSlideshowWidth(); ydiff = height() - photoObject->actualSlideshowHeight(); minXAllow = xdiff/2; minYAllow = ydiff/2; maxXAllow = minXAllow + photoObject->actualSlideshowWidth() - 1; maxYAllow = minYAllow + photoObject->actualSlideshowHeight() - 1; if(newX < minXAllow) newX = minXAllow; if(newX > maxXAllow) newX = maxXAllow; if(newY < minYAllow) newY = minYAllow; if(newY > maxYAllow) newY = maxYAllow; return QPoint(newX, newY); }

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 230 of file photoViewWidget.cpp. References Photo::actualSlideshowHeight(), Photo::actualSlideshowWidth(), corner1, corner2, and photoObject. Referenced by PhotoEditWidget::findScaledSelection(). { //if none selected just return that if(corner1->x() == -1) { topLeft.setX(corner1->x()); topLeft.setY(corner1->y()); bottomRight.setX(corner2->x()); bottomRight.setY(corner2->y()); return; } //-- //set coordinates based on raw selection //-- if(corner1->x() < corner2->x()) { topLeft.setX( corner1->x() ); bottomRight.setX( corner2->x() ); } else { topLeft.setX( corner2->x() ); bottomRight.setX( corner1->x() ); } //-- if(corner1->y() < corner2->y()) { topLeft.setY( corner1->y() ); bottomRight.setY( corner2->y() ); } else { topLeft.setY( corner2->y() ); bottomRight.setY( corner1->y() ); } //-- //subtract offsets from coordinates int xbuff = (width() - photoObject->actualSlideshowWidth()) / 2; int ybuff = (height() - photoObject->actualSlideshowHeight()) / 2; topLeft.setX( topLeft.x() - xbuff ); topLeft.setY( topLeft.y() - ybuff ); bottomRight.setX( bottomRight.x() - xbuff ); bottomRight.setY( bottomRight.y() - ybuff ); //-- }

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

Definition at line 163 of file photoViewWidget.cpp. References corner2, cropSelectedPoint(), and currentlyDragging. { if(!currentlyDragging) return; QPoint p = cropSelectedPoint(e->pos()); corner2->setX( p.x() ); corner2->setY( p.y() ); repaint(false); }

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

Definition at line 149 of file photoViewWidget.cpp. References corner1, corner2, cropSelectedPoint(), currentlyDragging, and photo. { if(photo == NULL) return; currentlyDragging = true; QPoint p = cropSelectedPoint(e->pos()); corner1->setX( p.x() ); corner1->setY( p.y() ); corner2->setX( corner1->x() ); corner2->setY( corner1->y() ); repaint(false); }

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

Definition at line 175 of file photoViewWidget.cpp. References currentlyDragging. { currentlyDragging = false; }

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

Definition at line 78 of file photoViewWidget.cpp. References corner1, corner2, and photo. { //if no photo just paint white if(photo == NULL) { QPainter p; p.begin(this); p.fillRect(e->rect(), Qt::white); p.end(); return; } //create buffer to draw in QRect rct = rect(); rct.moveBy(-x(), -y()); QPixmap buffer( size() ); //create a painter pointing to the buffer QPainter bufferPainter( &buffer ); //first flood entire region with white buffer.fill( white ); //next paint the image QRect pr(0, 0, photo->width(), photo->height()); bufferPainter.drawPixmap(pr, *photo); //next draw selection rectangle int xmin, xmax, ymin, ymax; if(corner1->x() < corner2->x()) xmin = corner1->x(); else xmin = corner2->x(); if(corner1->x() > corner2->x()) xmax = corner1->x(); else xmax = corner2->x(); if(corner1->y() < corner2->y()) ymin = corner1->y(); else ymin = corner2->y(); if(corner1->y() > corner2->y()) ymax = corner1->y(); else ymax = corner2->y(); QRect selection( xmin, ymin, xmax-xmin+1, ymax-ymin+1 ); //construct a pen for selection drawing purposes QPen selectionPen; //draw selection in white selectionPen.setStyle( Qt::SolidLine ); selectionPen.setColor( white ); bufferPainter.setPen( selectionPen); bufferPainter.drawRect(selection); //draw selection a second time with dashed black, thus //producing an alternating black-white selection rectangle selectionPen.setStyle( Qt::DotLine ); selectionPen.setColor( black ); bufferPainter.setPen( selectionPen); bufferPainter.drawRect(selection); bufferPainter.end(); //paint buffer to widget bitBlt( this, e->rect().topLeft(), &buffer, e->rect() ); }

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

Definition at line 209 of file photoViewWidget.cpp. References Photo::actualSlideshowHeight(), Photo::actualSlideshowWidth(), corner1, corner2, and photoObject. Referenced by PhotoViewWidget(). { int minXAllow, maxXAllow, minYAllow, maxYAllow; int xdiff, ydiff; xdiff = width() - photoObject->actualSlideshowWidth(); ydiff = height() - photoObject->actualSlideshowHeight(); minXAllow = xdiff/2; minYAllow = ydiff/2; maxXAllow = minXAllow + photoObject->actualSlideshowWidth() - 1; maxYAllow = minYAllow + photoObject->actualSlideshowHeight() - 1; corner1->setX( minXAllow ); corner1->setY( minYAllow ); corner2->setX( maxXAllow ); corner2->setY( maxYAllow ); repaint(false); }

void PhotoViewWidget::setPhoto (  Photo *  photo  )

Updates displayed photo. Definition at line 57 of file photoViewWidget.cpp. References corner1, corner2, Photo::getSlideshowFilename(), photo, and photoObject. Referenced by PhotoEditWidget::applyImageUpdate(), PhotoEditWidget::resetImageAction(), and PhotoEditWidget::setPhoto(). { //delete pixmap delete photo; //construct new pixmap photo = new QPixmap(phto->getSlideshowFilename()); //save photo object handle photoObject = phto; //reset selection area to nothing corner1->setX(-1); corner1->setY(-1); corner2->setX(-1); corner2->setY(-1); //repaint repaint(false); }

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Member Data Documentation

QPoint* PhotoViewWidget::corner1 [private]

first corner of selection, where mouse first clicked Definition at line 72 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 75 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 78 of file photoViewWidget.h. Referenced by mouseMoveEvent(), mousePressEvent(), mouseReleaseEvent(), and PhotoViewWidget().

QPixmap* PhotoViewWidget::photo [private]

Photo pixmap. Definition at line 66 of file photoViewWidget.h. Referenced by mousePressEvent(), paintEvent(), PhotoViewWidget(), setPhoto(), and ~PhotoViewWidget().

Photo* PhotoViewWidget::photoObject [private]

Photo object handle. Definition at line 69 of file photoViewWidget.h. Referenced by cropSelectedPoint(), getSelection(), PhotoViewWidget(), selectAll(), and setPhoto().

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The documentation for this class was generated from the following files:

• photoViewWidget.h
• photoViewWidget.cpp

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