Class derived from Fl_Button with added help blobs

This commit is contained in:
Luis Ibanez 2001-06-12 18:43:19 -04:00
parent 918c8c4f3a
commit 302907efe8
2 changed files with 211 additions and 0 deletions

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

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#ifndef FLTKPropertyNameButtonWithHelp_h
#define FLTKPropertyNameButtonWithHelp_h
#include <Fl/Fl_Tile.H>
#include <Fl/Fl_Input.H>
#include <Fl/Fl_Box.H>
#include <Fl/Fl_Button.H>
#include <Fl/Fl_Window.H>
#include <string>
namespace fltk {
/**
Helper class for managing help blobs over the property name
*/
class PropertyNameButtonWithHelp : public Fl_Button
{
public:
PropertyNameButtonWithHelp(int x,int y,int w, int h,const char *l);
virtual ~PropertyNameButtonWithHelp();
int handle(int event);
void SetHelpText( const char * helpText);
void ShowHelp(void);
void HideHelp(void);
static void ShowHelpBlobCallback( void * );
private:
string m_HelpText;
// Class variables
static Fl_Window * helpBlob;
static Fl_Box * helpText;
static unsigned int counter;
static int lastMousePositionX;
static int lastMousePositionY;
};
} // end namespace fltk
#endif