Logitech T400 middle mouse button working as B2 in Plan9

cocoa-screen.m

changeset:   3459:62c46799f75a
tag:         tip
user:        delyan@raychev.org
date:        Sat Sep 07 16:14:14 2013 -0700
files:       src/cmd/devdraw/cocoa-screen.m
description:
Convert Logitech T400 L_Meta mouse button to middle mouse button


diff -r 8c459ad6cc84 -r 62c46799f75a src/cmd/devdraw/cocoa-screen.m
--- a/src/cmd/devdraw/cocoa-screen.m	Tue Aug 06 23:44:06 2013 -0400
+++ b/src/cmd/devdraw/cocoa-screen.m	Sat Sep 07 16:14:14 2013 -0700
@@ -820,9 +820,18 @@
 	NSString *s;
 	char c;
 	int k, m;
+	bool mouse_meta_key;
 	uint code;
+	enum
+	{
+		// NSEvent flags when mouse's Meta (fancy middle) button is pressed
+		MouseMetaKeyClickMask = 1048584,
+		L_META = 55,
+	};
 
+	code = [e keyCode];
 	m = [e modifierFlags];
+	mouse_meta_key = (m&MouseMetaKeyClickMask && code == L_META);
 
 	switch([e type]){
 	case NSKeyDown:
@@ -837,7 +846,6 @@
 			break;
 		}
 		k = c;
-		code = [e keyCode];
 		if(code<nelem(keycvt) && keycvt[code])
 			k = keycvt[code];
 		if(k==0)
@@ -849,9 +857,9 @@
 		break;
 
 	case NSFlagsChanged:
-		if(in.mbuttons || in.kbuttons){
+		if(in.mbuttons || in.kbuttons || mouse_meta_key){
 			in.kbuttons = 0;
-			if(m & NSAlternateKeyMask)
+			if(m & NSAlternateKeyMask || mouse_meta_key)
 				in.kbuttons |= 2;
 			if(m & NSCommandKeyMask)
 				in.kbuttons |= 4;