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/*
** Copyright 2002, Double Precision Inc.
**
** See COPYING for distribution information.
*/
#ifndef curseskeyhandler_H
#define curseskeyhandler_H
#include <list>
#include "mycurses.H"
#define PRI_STATUSOVERRIDEHANDLER -4 // Override even the status line
#define PRI_STATUSHANDLER -3 // Status line
#define PRI_DIALOGHANDLER -2 // Dialog
#define PRI_PRISCREENHANDLER -1 // Normal screenwide handler,
// but prior to any focus handling
#define PRI_SCREENHANDLER 0 // Normal screenwide handler
#define PRI_DEFAULTCTRLCHANDLER 1 // CTRL-C handler
/////////////////////////////////////////////////////////////////////////////
//
// A list of prioritized key handlers. CursesKeyHandler objects are created
// whenever a function key shortcut should be used. Each CursesKeyHandler
// defines a processKey() method that returns true if it has processed the
// received key input. The object should also implement listKeys(), to append
// a list of keys it handles to the list argument.
//
// Each key handler has a defined priority. The handle() method runs
// the processKey method of all defined handlers, in priority order, until
// processKey returns true.
// The processKeyInFocus method of the specified Curses object may be called
// (if focus is not NULL), in the event that no key handler with a negative
// priority processed the key (and if processKeyInFocus also doesn't handle
// the key, any remaining non-negative keyhandlers are given a crack at this).
class CursesKeyHandler {
int priority;
public:
CursesKeyHandler(int priorityArg);
virtual ~CursesKeyHandler();
static bool handle(const Curses::Key &key, Curses *focus);
// Returns true if the key was consumed.
protected:
virtual bool processKey(const Curses::Key &key)=0;
// Key handlers should subclass this and enumerate all the keys
// they handle. <key name, description> should be added to list.
// Subclass should return true to ignore the rest of keyhandlers.
public:
virtual bool listKeys( std::vector< std::pair<std::string,
std::string> > &list);
private:
static std::list<CursesKeyHandler *> handlers;
public:
static std::list<CursesKeyHandler *>::const_iterator begin()
{
return handlers.begin();
}
static std::list<CursesKeyHandler *>::const_iterator end()
{
return handlers.end();
}
static bool handlerListModified;
// Reset to true each time a handler is added or removed, used to
// indicate when the status line should be redrawn
};
#endif
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