f48a5fe387
screens into CPrimaryScreen and merged common code from secondary screens into CSecondaryScreen. changed is-a relationship to a has-a between the primary and secondary screen classes and the generic platform dependent screen class to avoid multiple inheritance of implementation. also standardized the interface for those generic screen classes. adding a platform now involves implementing simpler interfaces: IScreen for the generic screen, IScreenEventHandler and some methods of CPrimaryScreen for the primary screen, and IScreenEventHandler and some methods of CSecondaryScreen for the secondary screen. did X11 platform but not win32 platform.
39 lines
1.4 KiB
C++
39 lines
1.4 KiB
C++
#ifndef ISCREENEVENTHANDLER_H
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#define ISCREENEVENTHANDLER_H
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#include "IInterface.h"
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// the platform screen should define this
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class CEvent;
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class IScreen;
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// the interface through which IScreen sends notification of events.
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// each platform will derive two types from IScreenEventHandler, one
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// for handling events on the primary screen and one for the
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// secondary screen. the header file with the IScreen subclass for
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// each platform should define the CEvent type, which depends on the
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// type of native events for that platform.
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class IScreenEventHandler : public IInterface {
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public:
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// manipulators
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// called if the screen is unexpectedly closing. this implies that
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// the screen is no longer usable and that the program should
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// close the screen and possibly terminate.
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virtual void onError() = 0;
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// called when the screensaver is activated or deactivated
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virtual void onScreensaver(bool activated) = 0;
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// called for each event before event translation and dispatch. return
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// true to skip translation and dispatch. subclasses should call the
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// superclass's version first and return true if it returns true.
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virtual bool onPreDispatch(const CEvent* event) = 0;
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// called by mainLoop(). iff the event was handled return true and
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// store the result, if any, in m_result, which defaults to zero.
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virtual bool onEvent(CEvent* event) = 0;
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};
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#endif
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