barrier/platform/CXWindowsScreen.h

123 lines
3.4 KiB
C++

#ifndef CXWINDOWSSCREEN_H
#define CXWINDOWSSCREEN_H
#include "BasicTypes.h"
#include "ClipboardTypes.h"
#include "CMutex.h"
#include <X11/Xlib.h>
class IClipboard;
class CXWindowsClipboard;
class CXWindowsScreen {
public:
CXWindowsScreen();
virtual ~CXWindowsScreen();
protected:
class CDisplayLock {
public:
CDisplayLock(const CXWindowsScreen*);
~CDisplayLock();
operator Display*() const;
private:
const CMutex* m_mutex;
Display* m_display;
};
friend class CDisplayLock;
// open the X display. calls onOpenDisplay() after opening the display,
// getting the screen, its size, and root window. then it starts the
// event thread.
void openDisplay();
// destroy the window and close the display. calls onCloseDisplay()
// after the event thread has been shut down but before the display
// is closed.
void closeDisplay();
// get the opened screen, its size, its root window. to get the
// display create a CDisplayLock object passing this. while the
// object exists no other threads may access the display. do not
// save the Display* beyond the lifetime of the CDisplayLock.
int getScreen() const;
void getScreenSize(SInt32* w, SInt32* h) const;
Window getRoot() const;
// create a cursor that is transparent everywhere
Cursor createBlankCursor() const;
// wait for and get the next X event. cancellable.
bool getEvent(XEvent*) const;
// cause getEvent() to return false immediately and forever after.
// the caller must have locked the display.
void doStop();
// set the contents of the clipboard (i.e. primary selection)
bool setDisplayClipboard(ClipboardID,
const IClipboard* clipboard);
// copy the clipboard contents to clipboard
bool getDisplayClipboard(ClipboardID,
IClipboard* clipboard) const;
// called by openDisplay() to allow subclasses to prepare the display.
// the display is locked and passed to the subclass.
virtual void onOpenDisplay(Display*) = 0;
// called by openDisplay() after onOpenDisplay() to create each clipboard
virtual CXWindowsClipboard*
createClipboard(ClipboardID) = 0;
// called by closeDisplay() to allow subclasses to clean up the display.
// the display is locked and passed to the subclass. note that the
// display may be NULL if the display has unexpectedly disconnected.
virtual void onCloseDisplay(Display*) = 0;
// called if the display is unexpectedly closing. default does nothing.
virtual void onUnexpectedClose();
// called when a clipboard is lost
virtual void onLostClipboard(ClipboardID) = 0;
private:
// internal event processing
bool processEvent(XEvent*);
// determine the clipboard from the X selection. returns
// kClipboardEnd if no such clipboard.
ClipboardID getClipboardID(Atom selection) const;
// continue processing a selection request
void processClipboardRequest(Window window,
Time time, Atom property);
// terminate a selection request
void destroyClipboardRequest(Window window);
// X I/O error handler
static int ioErrorHandler(Display*);
private:
Display* m_display;
int m_screen;
Window m_root;
SInt32 m_w, m_h;
bool m_stop;
// clipboards
CXWindowsClipboard* m_clipboard[kClipboardEnd];
// X is not thread safe
CMutex m_mutex;
// pointer to (singleton) screen. this is only needed by
// ioErrorHandler().
static CXWindowsScreen* s_screen;
};
#endif