ClickableLabel Class Reference

A clickable label. More...

#include <clickableLabel.h>

Inheritance diagram for ClickableLabel:

Collaboration diagram for ClickableLabel:

Public Slots
void	setEnabled (bool val)
void	setPixmap (const QPixmap &p)

Signals
void	clicked ()

Public Member Functions
	ClickableLabel (QWidget *parent=0, const char *name=0)
void	setInvisible (bool val)

Protected Member Functions
void	paintEvent (QPaintEvent *e)
	double buffer to avoid flicker
void	enterEvent (QEvent *)
void	leaveEvent (QEvent *)
void	mouseMoveEvent (QMouseEvent *e)
void	mousePressEvent (QMouseEvent *)
void	mouseReleaseEvent (QMouseEvent *e)

Private Member Functions
void	setActive ()
void	setHighlighted ()

Private Attributes
QPixmap	defaultPixmap
bool	enabled
bool	invisible
bool	pressed

Detailed Description

A clickable label.

Definition at line 27 of file clickableLabel.h.

Constructor & Destructor Documentation

ClickableLabel()

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

Definition at line 28 of file clickableLabel.cpp.

                                                                  : QLabel( parent, name ) 
{
  setWindowFlags(Qt::WNoAutoErase);
  enabled = true;
  invisible = false;
  pressed = false;
  setMouseTracking(true);
}

References enabled, invisible, and pressed.

Member Function Documentation

clicked

void ClickableLabel::clicked ( )

signal

Referenced by mouseReleaseEvent().

enterEvent()

void ClickableLabel::enterEvent ( QEvent * )

protected

Definition at line 123 of file clickableLabel.cpp.

{
  if( !enabled ) return;
  
  if( pressed )
    setActive();
  else
    setHighlighted();
}

References enabled, pressed, setActive(), and setHighlighted().

leaveEvent()

void ClickableLabel::leaveEvent ( QEvent * )

protected

Definition at line 115 of file clickableLabel.cpp.

{
  if( !enabled ) return;
 
  if(!defaultPixmap.isNull())
  { this->setPixmap( defaultPixmap ); }      
}

References defaultPixmap, enabled, and setPixmap().

mouseMoveEvent()

void ClickableLabel::mouseMoveEvent ( QMouseEvent * e )

protected

Definition at line 95 of file clickableLabel.cpp.

{
  if( !enabled ) return;
 
  QPoint p = e->pos();
  if( p.x() < 0 || p.y() < 0 ||
      p.x() >= width() || p.y() >= height() )
  {
    if(!defaultPixmap.isNull())
    { this->setPixmap( defaultPixmap ); }      
  }
  else
  {  
    if( pressed )
      setActive();
    else
      setHighlighted();
  }  
}

References defaultPixmap, enabled, height, pressed, setActive(), setHighlighted(), setPixmap(), and width.

mousePressEvent()

void ClickableLabel::mousePressEvent ( QMouseEvent * )

protected

Definition at line 191 of file clickableLabel.cpp.

{
  if( !enabled ) return;
  
  pressed = true;
  setActive();  
}

References enabled, pressed, and setActive().

mouseReleaseEvent()

void ClickableLabel::mouseReleaseEvent ( QMouseEvent * e )

protected

Definition at line 199 of file clickableLabel.cpp.

{  
  if( !enabled || invisible ) return;
  
  pressed = false;
 
  //restore pixmap if exists
  if(!defaultPixmap.isNull())
  { this->setPixmap( defaultPixmap ); }
  
  //if mouse still over button emit clicked signal
  if(e->pos().x() >= 0 &&
     e->pos().y() >= 0 &&
     e->pos().x() < width() &&
     e->pos().y() < height() )
  {    
    emit clicked();
  }
}

References clicked(), defaultPixmap, enabled, height, invisible, pressed, setPixmap(), and width.

paintEvent()

void ClickableLabel::paintEvent ( QPaintEvent * e )

protected

double buffer to avoid flicker

Definition at line 37 of file clickableLabel.cpp.

{
  QPixmap buffer( size() );
  QPainter bufferPainter( &buffer );
  bufferPainter.setClipping(false);
  bufferPainter.fillRect( buffer.rect(), backgroundBrush() );
 
  //only paint label if not invisible
  if( !invisible ) 
  { bufferPainter.drawImage( QPoint(0,0), pixmap()->convertToImage() ); }
  
  bufferPainter.end();
  bitBlt( this, e->rect().x(), e->rect().y(),
          &buffer, 
          e->rect().x(), e->rect().y(),
          e->rect().width(), e->rect().height() );
}

References buffer, and invisible.

setActive()

void ClickableLabel::setActive ( )

private

Definition at line 133 of file clickableLabel.cpp.

{
  if( ! defaultPixmap.isNull() )
  {
    //create darkened out version
    QImage newImage = defaultPixmap.convertToImage();
    QImage alpha = newImage.createAlphaMask();
    int x, y;
    for(y=0; y<newImage.height(); y++)
    {
      for(x=0; x<newImage.width(); x++)
      {
        if(alpha.isNull() || qRed(alpha.pixel(x,y)) == 0)
        {
          QRgb rgb = newImage.pixel(x,y);
          int r = (int) (0.5*qRed(rgb));
          int g = (int) (0.5*qGreen(rgb));
          int b = (int) (0.5*qBlue(rgb));
          rgb = qRgb( r, g, b );
          newImage.setPixel( x, y, rgb );
        }
      }
    }
    QPixmap newPixmap;
    newPixmap.convertFromImage( newImage );
    QLabel::setPixmap( newPixmap );
  }  
}

References b, and defaultPixmap.

Referenced by enterEvent(), mouseMoveEvent(), and mousePressEvent().

setEnabled

void ClickableLabel::setEnabled ( bool val )

slot

Definition at line 62 of file clickableLabel.cpp.

{
  if( val )
    setPixmap( defaultPixmap );
  else if( ! defaultPixmap.isNull() )
  {
    //create over exposed gray version
    QImage newImage = defaultPixmap.convertToImage();
    QImage alpha = newImage.createAlphaMask();
    int x, y;
    for(y=0; y<newImage.height(); y++)
    {
      for(x=0; x<newImage.width(); x++)
      {
        if(alpha.isNull() || qRed(alpha.pixel(x,y)) == 0)
        {
          QRgb rgb = newImage.pixel(x,y);
          int gray = qGray(rgb);
          double alpha = 0.5;
          gray = (int) (alpha*gray+(1-alpha)*255);
          rgb = qRgb( gray, gray, gray );
          newImage.setPixel( x, y, rgb );
        }
      }
    }
    QPixmap newPixmap;
    newPixmap.convertFromImage( newImage );
    QLabel::setPixmap( newPixmap );
  }
  
  enabled = val;
}

References defaultPixmap, enabled, and setPixmap().

Referenced by EditingInterface::EditingInterface(), EditingInterface::handleSelectionChanged(), EditingInterface::setPhoto(), and MosaicOptionsDialog::updateImagesFromOptions().

setHighlighted()

void ClickableLabel::setHighlighted ( )

private

Definition at line 162 of file clickableLabel.cpp.

{
  if( ! defaultPixmap.isNull() )
  {
    //create slightly darker version
    QImage newImage = defaultPixmap.convertToImage();
    QImage alpha = newImage.createAlphaMask();
    int x, y;
    for(y=0; y<newImage.height(); y++)
    {
      for(x=0; x<newImage.width(); x++)
      {
        if(alpha.isNull() || qRed(alpha.pixel(x,y)) == 0)
        {
          QRgb rgb = newImage.pixel(x,y);
          int r = (int) (0.8*qRed(rgb));
          int g = (int) (0.8*qGreen(rgb));
          int b = (int) (0.8*qBlue(rgb));
          rgb = qRgba( r, g, b, qAlpha(rgb) );
          newImage.setPixel( x, y, rgb );
        }
      }
    }
    QPixmap newPixmap;
    newPixmap.convertFromImage( newImage );
    QLabel::setPixmap( newPixmap );
  }
}

References b, and defaultPixmap.

Referenced by enterEvent(), and mouseMoveEvent().

setInvisible()

void ClickableLabel::setInvisible

(

bool

val

)

Definition at line 219 of file clickableLabel.cpp.

{
  //avoid repainting when not necessary
  if( invisible != val)
  {
    invisible = val;
    repaint();
  }
}

References invisible.

Referenced by SaveDialog::nextScreenShot(), SaveDialog::prevScreenShot(), EditingInterface::setPhoto(), EditingInterface::showNextPrevFirstLastPhoto(), and SaveDialog::updatePreview().

setPixmap

void ClickableLabel::setPixmap ( const QPixmap & p )

slot

Definition at line 55 of file clickableLabel.cpp.

{
  defaultPixmap = p;
  defaultPixmap.detach();
  QLabel::setPixmap( p );  
}

References defaultPixmap.

Referenced by EditingInterface::EditingInterface(), GrainEditor::GrainEditor(), HistogramEditor::HistogramEditor(), leaveEvent(), MosaicOptionsDialog::MosaicOptionsDialog(), mouseMoveEvent(), mouseReleaseEvent(), SaveDialog::SaveDialog(), and setEnabled().

Member Data Documentation

defaultPixmap

QPixmap ClickableLabel::defaultPixmap

private

Definition at line 60 of file clickableLabel.h.

Referenced by leaveEvent(), mouseMoveEvent(), mouseReleaseEvent(), setActive(), setEnabled(), setHighlighted(), and setPixmap().

enabled

bool ClickableLabel::enabled

private

Definition at line 61 of file clickableLabel.h.

Referenced by ClickableLabel(), enterEvent(), leaveEvent(), mouseMoveEvent(), mousePressEvent(), mouseReleaseEvent(), and setEnabled().

invisible

bool ClickableLabel::invisible

private

Definition at line 62 of file clickableLabel.h.

Referenced by ClickableLabel(), mouseReleaseEvent(), paintEvent(), and setInvisible().

pressed

bool ClickableLabel::pressed

private

Definition at line 63 of file clickableLabel.h.

Referenced by ClickableLabel(), enterEvent(), mouseMoveEvent(), mousePressEvent(), and mouseReleaseEvent().

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

• clickableLabel.h
• clickableLabel.cpp