161 lines
2.9 KiB
C++
161 lines
2.9 KiB
C++
#include <FLTKPropertyNameButtonWithHelp.h>
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#include <Fl/Fl.H>
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namespace fltk {
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Fl_Window * PropertyNameButtonWithHelp::helpBlob = 0;
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Fl_Box * PropertyNameButtonWithHelp::helpText = 0;
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unsigned int PropertyNameButtonWithHelp::counter = 0;
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int PropertyNameButtonWithHelp::lastMousePositionX = 0;
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int PropertyNameButtonWithHelp::lastMousePositionY = 0;
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PropertyNameButtonWithHelp
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::PropertyNameButtonWithHelp(int x,int y, int w, int h, const char * l):
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Fl_Button(x,y,w,h,l)
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{
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counter++; // one more object instantiated
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}
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PropertyNameButtonWithHelp::
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~PropertyNameButtonWithHelp( )
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{
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counter--;
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if( counter == 0 )
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{
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delete helpBlob;
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delete helpText;
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}
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}
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void
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PropertyNameButtonWithHelp
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::SetHelpText( const char * text )
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{
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m_HelpText = text;
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}
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void
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PropertyNameButtonWithHelp
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::ShowHelp( void )
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{
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if( helpBlob )
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{
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helpBlob->show();
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}
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}
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void
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PropertyNameButtonWithHelp
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::HideHelp( void )
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{
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if( helpBlob )
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{
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helpBlob->hide();
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}
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}
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int
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PropertyNameButtonWithHelp::
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handle( int event )
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{
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const float delayForShowingHelpBlob = 1.0; // seconds
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const int maxWidth = 300;
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const int lineHeight = 20;
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// Create the help blob window if it doesn't exist
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if( !helpBlob )
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{
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helpBlob = new Fl_Window(0,0,200,20,"");
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helpBlob->border( 0 );
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helpText = new Fl_Box(0,0,200,20,"");
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helpBlob->end();
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Fl_Color yellowHelp = FL_YELLOW;
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helpBlob->color( yellowHelp );
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helpText->color( yellowHelp );
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helpText->align( FL_ALIGN_CENTER | FL_ALIGN_INSIDE | FL_ALIGN_WRAP );
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}
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int eventManaged = 0;
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switch( event )
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{
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case FL_ENTER:
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{
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lastMousePositionX = Fl::event_x();
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lastMousePositionY = Fl::event_y();
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const float factor = helpText->labelsize() * 0.5;
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int height = lineHeight;
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int area = (int)( m_HelpText.size() * factor );
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int width = area;
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if( width > maxWidth )
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{
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width = maxWidth;
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height = area / maxWidth * lineHeight;
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if( area % maxWidth != 0 )
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{
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height += lineHeight;
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}
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}
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helpText->size( width, height );
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helpBlob->size( width, height );
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helpText->label( m_HelpText.c_str() );
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Fl_Widget * parent = this->parent();
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Fl::add_timeout( delayForShowingHelpBlob, ShowHelpBlobCallback, (void *)parent );
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eventManaged = 0;
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break;
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}
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case FL_LEAVE:
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helpBlob->hide();
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eventManaged = 0;
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break;
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case FL_MOVE:
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helpBlob->hide();
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eventManaged = 0;
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break;
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default:
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eventManaged = 0;
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}
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return eventManaged;
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}
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void
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PropertyNameButtonWithHelp::
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ShowHelpBlobCallback( void * data )
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{
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Fl_Widget * thisWidget = Fl::belowmouse();
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Fl_Widget * eventWidget = (Fl_Widget *)data;
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if( thisWidget == eventWidget )
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{
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helpBlob->position( lastMousePositionX, lastMousePositionY );
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helpBlob->show();
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}
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}
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} // end namespace fltk
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