barrier/lib/client/CSecondaryScreen.h

#ifndef CSECONDARYSCREEN_H
#define CSECONDARYSCREEN_H

#include "ClipboardTypes.h"
#include "KeyTypes.h"
#include "MouseTypes.h"
#include "CMutex.h"

class IClipboard;
class IScreen;

//! Generic client-side screen
/*!
This is a platform independent base class for secondary screen
implementations.  A secondary screen is a client-side screen.
Each platform will derive a class from CSecondaryScreen to handle
platform dependent operations.
*/
class CSecondaryScreen {
public:
	CSecondaryScreen();
	virtual ~CSecondaryScreen();

	//! @name manipulators
	//@{

	//! Open screen
	/*!
	Opens the screen.  This includes initializing the screen,
	hiding the cursor, and disabling the screen saver.  It also causes
	events to the reported to an IScreenReceiver (which is set through
	some other interface).  Calls close() before returning (rethrowing)
	if it fails for any reason.
	*/
	void				open();

	//! Run event loop
	/*!
	Run the screen's event loop.  This returns when it detects
	the application should terminate or when exitMainLoop() is called.
	mainLoop() may only be called between open() and close().
	*/
	void				mainLoop();

	//! Exit event loop
	/*!
	Force mainLoop() to return.  This call can return before
	mainLoop() does (i.e. asynchronously).
	*/
	void				exitMainLoop();

	//! Close screen
	/*!
	Closes the screen.  This restores the screen saver, shows the cursor
	and closes the screen.  It also synthesizes key up events for any
	keys that are logically down;  without this the client will leave
	its keyboard in the wrong logical state.
	*/
	void				close();

	//! Enter screen
	/*!
	Called when the user navigates to this secondary screen.  Warps
	the cursor to the absolute coordinates \c x,y and unhides
	it.  Also prepares to synthesize input events.
	*/
	void				enter(SInt32 x, SInt32 y, KeyModifierMask mask);

	//! Leave screen
	/*!
	Called when the user navigates off the secondary screen.  Cleans
	up input event synthesis and hides the cursor.
	*/
	void				leave();

	//! Set clipboard
	/*!
	Sets the system's clipboard contents.  This is usually called
	soon after an enter().
	*/
	void				setClipboard(ClipboardID, const IClipboard*);

	//! Grab clipboard
	/*!
	Grabs (i.e. take ownership of) the system clipboard.
	*/
	void				grabClipboard(ClipboardID);

	//! Activate/deactivate screen saver
	/*!
	Forcibly activates the screen saver if \c activate is true otherwise
	forcibly deactivates it.
	*/
	void				screensaver(bool activate);

	//! Notify of key press
	/*!
	Synthesize key events to generate a press of key \c id.  If possible
	match the given modifier mask.
	*/
	virtual void		keyDown(KeyID id, KeyModifierMask) = 0;

	//! Notify of key repeat
	/*!
	Synthesize key events to generate a press and release of key \c id
	\c count times.  If possible match the given modifier mask.
	*/
	virtual void		keyRepeat(KeyID id, KeyModifierMask, SInt32 count) = 0;

	//! Notify of key release
	/*!
	Synthesize key events to generate a release of key \c id.  If possible
	match the given modifier mask.
	*/
	virtual void		keyUp(KeyID id, KeyModifierMask) = 0;

	//! Notify of mouse press
	/*!
	Synthesize mouse events to generate a press of mouse button \c id.
	*/
	virtual void		mouseDown(ButtonID id) = 0;

	//! Notify of mouse release
	/*!
	Synthesize mouse events to generate a release of mouse button \c id.
	*/
	virtual void		mouseUp(ButtonID id) = 0;

	//! Notify of mouse motion
	/*!
	Synthesize mouse events to generate mouse motion to the absolute
	screen position \c xAbs,yAbs.
	*/
	virtual void		mouseMove(SInt32 xAbs, SInt32 yAbs) = 0;

	//! Notify of mouse wheel motion
	/*!
	Synthesize mouse events to generate mouse wheel motion of \c delta.
	\c delta is positive for motion away from the user and negative for
	motion towards the user.  Each wheel click should generate a delta
	of +/-120.
	*/
	virtual void		mouseWheel(SInt32 delta) = 0;

	//@}
	//! @name accessors
	//@{

	//! Test if active
	/*!
	Returns true iff the screen is active (i.e. the user has entered
	the screen).  Note this is the reverse of a primary screen.
	*/
	bool				isActive() const;

	//! Get clipboard
	/*!
	Saves the contents of the system clipboard indicated by \c id.
	*/
	void				getClipboard(ClipboardID id, IClipboard*) const;

	//! Get jump zone size
	/*!
	Return the jump zone size, the size of the regions on the edges of
	the screen that cause the cursor to jump to another screen.
	*/
	virtual SInt32		getJumpZoneSize() const = 0;

	//! Get screen shape
	/*!
	Return the position of the upper-left corner of the screen in \c x and
	\c y and the size of the screen in \c width and \c height.
	*/
	virtual void		getShape(SInt32& x, SInt32& y,
							SInt32& width, SInt32& height) const;

	//! Get cursor position
	/*!
	Return the current position of the cursor in \c x,y.
	*/
	virtual void		getCursorPos(SInt32& x, SInt32& y) const;

	//! Get screen
	/*!
	Return the platform dependent screen.
	*/
	virtual IScreen*	getScreen() const = 0;

	//@}

protected:
	//! Pre-mainLoop() hook
	/*!
	Called on entry to mainLoop().  Override to perform platform specific
	operations.  Default does nothing.  May throw.
	*/
	virtual void		onPreMainLoop();

	//! Post-mainLoop() hook
	/*!
	Called on exit from mainLoop().  Override to perform platform specific
	operations.  Default does nothing.  May \b not throw.
	*/
	virtual void		onPostMainLoop();

	//! Pre-open() hook
	/*!
	Called on entry to open().  Override to perform platform specific
	operations.  Default does nothing.  May throw.
	*/
	virtual void		onPreOpen();

	//! Post-open() hook
	/*!
	Called on exit from open() iff the open was successful.  Default
	does nothing.  May throw.
	*/
	virtual void		onPostOpen();

	//! Pre-close() hook
	/*!
	Called on entry to close().  Override to perform platform specific
	operations.  Default does nothing.  May \b not throw.
	*/
	virtual void		onPreClose();

	//! Post-close() hook
	/*!
	Called on exit from close().  Override to perform platform specific
	operations.  Default does nothing.  May \b not throw.
	*/
	virtual void		onPostClose();

	//! Pre-enter() hook
	/*!
	Called on entry to enter() after desktop synchronization.  Override
	to perform platform specific operations.  Default does nothing.  May
	\b not throw.
	*/
	virtual void		onPreEnter();

	//! Post-enter() hook
	/*!
	Called on exit from enter().  Override to perform platform specific
	operations.  Default does nothing.  May \b not throw.
	*/
	virtual void		onPostEnter();

	//! Pre-leave() hook
	/*!
	Called on entry to leave() after desktop synchronization.  Override
	to perform platform specific operations.  Default does nothing.  May
	\b not throw.
	*/
	virtual void		onPreLeave();

	//! Post-leave() hook
	/*!
	Called on exit from leave().  Override to perform platform specific
	operations.  Default does nothing.  May \b not throw.
	*/
	virtual void		onPostLeave();

	//! Create window
	/*!
	Called to create the window.  This window is generally used to
	receive events and hide the cursor.
	*/
	virtual void		createWindow() = 0;

	//! Destroy window
	/*!
	Called to destroy the window created by createWindow().
	*/
	virtual void		destroyWindow() = 0;

	//! Show window
	/*!
	Called when the user navigates off this secondary screen.  It needn't
	actually show the window created by createWindow() but it must hide
	the cursor and clean up event synthesis.
	*/
	virtual void		showWindow() = 0;

	//! Hide window
	/*!
	Called when the user navigates to this secondary screen.  It should
	hide the window (if shown), show the cursor, and prepare to synthesize
	input events.
	*/
	virtual void		hideWindow() = 0;

	//! Warp cursor
	/*!
	Warp the cursor to the absolute coordinates \c x,y.
	*/
	virtual void		warpCursor(SInt32 x, SInt32 y) = 0;

	//! Synchronize key state
	/*!
	Check the current keyboard state.  Normally a screen will save
	the keyboard state in this method and use this shadow state
	when synthesizing events.
	*/
	virtual void		updateKeys() = 0;

	//! Synchronize toggle key state
	/*!
	Toggle modifiers that don't match the given state so that they do.
	*/
	virtual void		setToggleState(KeyModifierMask) = 0;

private:
	CMutex				m_mutex;

	// m_active is true if this screen has been entered
	bool				m_active;
};

#endif