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Added a method WMAvailable(). This will return True if and only if there 

is a window manager and we can connect to it, i.e. if it is safe to try
and put up windows.

As a side effect the first call will make the current process frontmost.
This commit is contained in:
Jack Jansen 2003-02-21 16:31:11 +00:00
parent 0fd583ce4d
commit d7c1723742
1 changed files with 43 additions and 0 deletions
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43
Mac/Modules/macosmodule.c
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@ -36,6 +36,7 @@ OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
#include <Events.h>
#else
#include <Carbon/Carbon.h>
#include <ApplicationServices/ApplicationServices.h>
#endif
static PyObject *MacOS_Error; /* Exception MacOS.Error */
@ -521,6 +522,47 @@ MacOS_SysBeep(PyObject *self, PyObject *args)
return Py_None;
}
static char WMAvailable_doc[] =
"True if this process can interact with the display."
"Will foreground the application on the first call as a side-effect."
;
static PyObject *
MacOS_WMAvailable(PyObject *self, PyObject *args)
{
static PyObject *rv = NULL;
if (!PyArg_ParseTuple(args, ""))
return NULL;
if (!rv) {
#if TARGET_API_MAC_OSX
ProcessSerialNumber psn;
/*
** This is a fairly innocuous call to make if we don't have a window
** manager, or if we have no permission to talk to it. It will print
** a message on stderr, but at least it won't abort the process.
** It appears the function caches the result itself, and it's cheap, so
** no need for us to cache.
*/
if (CGMainDisplayID() == 0) {
rv = Py_False;
} else {
if (GetCurrentProcess(&psn) < 0 ||
SetFrontProcess(&psn) < 0) {
rv = Py_False;
} else {
rv = Py_True;
}
}
#else
rv = Py_True;
#endif
}
Py_INCREF(rv);
return rv;
}
static char GetTicks_doc[] = "Return number of ticks since bootup";
static PyObject *
@ -672,6 +714,7 @@ static PyMethodDef MacOS_Methods[] = {
{"DebugStr", MacOS_DebugStr, 1, DebugStr_doc},
{"GetTicks", MacOS_GetTicks, 1, GetTicks_doc},
{"SysBeep", MacOS_SysBeep, 1, SysBeep_doc},
{"WMAvailable", MacOS_WMAvailable, 1, WMAvailable_doc},
#if !TARGET_API_MAC_OSX
{"FreeMem", MacOS_FreeMem, 1, FreeMem_doc},
{"MaxBlock", MacOS_MaxBlock, 1, MaxBlock_doc},