First Commit

libui-ng/darwin/future.m

@@ -0,0 +1,53 @@
+// 19 may 2017
+#import "uipriv_darwin.h"
+
+// functions and constants FROM THE FUTURE!
+// note: for constants, dlsym() returns the address of the constant itself, as if we had done &constantName
+
+// added in OS X 10.10; we need 10.8
+CFStringRef *uiprivFUTURE_kCTFontOpenTypeFeatureTag = NULL;
+CFStringRef *uiprivFUTURE_kCTFontOpenTypeFeatureValue = NULL;
+
+// added in OS X 10.12; we need 10.8
+CFStringRef *uiprivFUTURE_kCTBackgroundColorAttributeName = NULL;
+
+// note that we treat any error as "the symbols aren't there" (and don't care if dlclose() failed)
+void uiprivLoadFutures(void)
+{
+	void *handle;
+
+	// dlsym() walks the dependency chain, so opening the current process should be sufficient
+	handle = dlopen(NULL, RTLD_LAZY);
+	if (handle == NULL)
+		return;
+#define GET(var, fn) *((void **) (&var)) = dlsym(handle, #fn)
+	GET(uiprivFUTURE_kCTFontOpenTypeFeatureTag, kCTFontOpenTypeFeatureTag);
+	GET(uiprivFUTURE_kCTFontOpenTypeFeatureValue, kCTFontOpenTypeFeatureValue);
+	GET(uiprivFUTURE_kCTBackgroundColorAttributeName, kCTBackgroundColorAttributeName);
+	dlclose(handle);
+}
+
+// wrappers for methods that exist in the future that we can check for with respondsToSelector:
+// keep them in one place for convenience
+
+// apparently only added in 10.9; we need 10.8
+void uiprivFUTURE_NSLayoutConstraint_setIdentifier(NSLayoutConstraint *constraint, NSString *identifier)
+{
+	id cid = (id) constraint;
+
+	if ([constraint respondsToSelector:@selector(setIdentifier:)])
+		[cid setIdentifier:identifier];
+}
+
+// added in 10.11; we need 10.8
+// return whether this was done because we recreate its effects if not (see winmoveresize.m)
+BOOL uiprivFUTURE_NSWindow_performWindowDragWithEvent(NSWindow *w, NSEvent *initialEvent)
+{
+	id cw = (id) w;
+
+	if ([w respondsToSelector:@selector(performWindowDragWithEvent:)]) {
+		[cw performWindowDragWithEvent:initialEvent];
+		return YES;
+	}
+	return NO;
+}