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Added a fe comments to explain multi-monitor support on Win32 better.

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git-svn-id: file:///fltk/svn/fltk/branches/branch-1.1@5574 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
This commit is contained in:
Matthias Melcher 2007-01-01 18:29:20 +00:00
parent 2c16ddb964
commit 230a2a4332
1 changed files with 10 additions and 0 deletions
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10
src/screen_xywh.cxx
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@ -40,6 +40,14 @@ static int num_screens = 0;
# include <multimon.h> # include <multimon.h>
# endif // !HMONITOR_DECLARED && _WIN32_WINNT < 0x0500 # endif // !HMONITOR_DECLARED && _WIN32_WINNT < 0x0500
// We go the much more difficult route of individually picking some multi-screen
// functions from the USER32.DLL . If these functions are not available, we
// will gracefully fall back to single monitor support.
//
// If we were to insist on the existence of "EnumDisplayMonitors" and
// "GetMonitorInfoA", it would be impossible to use FLTK on Windows 2000
// before SP2 or earlier.
// BOOL EnumDisplayMonitors(HDC, LPCRECT, MONITORENUMPROC, LPARAM) // BOOL EnumDisplayMonitors(HDC, LPCRECT, MONITORENUMPROC, LPARAM)
typedef BOOL (WINAPI* fl_edm_func)(HDC, LPCRECT, MONITORENUMPROC, LPARAM); typedef BOOL (WINAPI* fl_edm_func)(HDC, LPCRECT, MONITORENUMPROC, LPARAM);
// BOOL GetMonitorInfo(HMONITOR, LPMONITORINFO) // BOOL GetMonitorInfo(HMONITOR, LPMONITORINFO)
@ -56,6 +64,7 @@ static BOOL CALLBACK screen_cb(HMONITOR mon, HDC, LPRECT r, LPARAM) {
mi.cbSize = sizeof(mi); mi.cbSize = sizeof(mi);
// GetMonitorInfo(mon, &mi); // GetMonitorInfo(mon, &mi);
// (but we use our self-aquired function pointer instead)
if (fl_gmi(mon, &mi)) { if (fl_gmi(mon, &mi)) {
screens[num_screens] = mi.rcWork; screens[num_screens] = mi.rcWork;
num_screens ++; num_screens ++;
@ -84,6 +93,7 @@ static void screen_init() {
// We have GetMonitorInfoA, enumerate all the screens... // We have GetMonitorInfoA, enumerate all the screens...
num_screens = 0; num_screens = 0;
// EnumDisplayMonitors(0,0,screen_cb,0); // EnumDisplayMonitors(0,0,screen_cb,0);
// (but we use our self-aquired function pointer instead)
fl_edm(0, 0, screen_cb, 0); fl_edm(0, 0, screen_cb, 0);
return; return;
} }