[dev] dmenu: mouse patch

[Connor Lane Smith]

Hey all,

In case anyone's interested, here's a patch which adds some basic
mouse support to dmenu.

You can click things, click the paginators ("<" and ">"), and scroll.

cls

diff -r 6e962f2337c2 dmenu.c
--- a/dmenu.c	Sun Oct 16 18:26:11 2011 +0100
+++ b/dmenu.c	Mon Oct 17 00:55:51 2011 +0100
@@ -24,6 +24,7 @@
 };
 
 static void appenditem(Item *item, Item **list, Item **last);
+static void buttonrelease(XButtonEvent *ev);
 static void calcoffsets(void);
 static char *cistrstr(const char *s, const char *sub);
 static void drawmenu(void);
@@ -131,6 +132,62 @@
 }
 
 void
+buttonrelease(XButtonEvent *ev)
+{
+	int i;
+	Item *item = curr;
+
+	switch(ev->button) {
+	case Button1:
+		if(ev->y > bh || (ev->x > promptw + inputw + textw(dc, "<") && ev->x < mw - textw(dc, ">"))) {
+			if(lines == 0) {
+				i = promptw + inputw + textw(dc, "<");
+				while(item && (i += textw(dc, item->text)) < ev->x)
+					item = item->right;
+			}
+			else
+				for(i = 1; item && i < ev->y / bh; i++)
+					item = item->right;
+			if(!item || item == next)
+				return;
+			if(item == sel) {
+				puts(sel->text);
+				exit(EXIT_SUCCESS);
+			}
+			else
+				sel = item;
+		}
+		else if(lines == 0 && ev->x > promptw + inputw) {
+			if(ev->x < mw - textw(dc, "<")) {
+				if(!prev)
+					return;
+				sel = curr = prev;
+			}
+			else {
+				if(!next)
+					return;
+				sel = curr = next;
+			}
+			calcoffsets();
+		}
+		break;
+	case Button4: /* scroll up */
+		if(sel && sel->left && (sel = sel->left)->right == curr) {
+			curr = prev;
+			calcoffsets();
+		}
+		break;
+	case Button5: /* scroll down */
+		if(sel && sel->right && (sel = sel->right) == next) {
+			curr = next;
+			calcoffsets();
+		}
+		break;
+	}
+	drawmenu();
+}
+
+void
 calcoffsets(void) {
 	int i, n;
 
@@ -463,6 +520,9 @@
 
 	while(!XNextEvent(dc->dpy, &ev))
 		switch(ev.type) {
+		case ButtonRelease:
+			buttonrelease(&ev.xbutton);
+			break;
 		case Expose:
 			if(ev.xexpose.count == 0)
 				mapdc(dc, win, mw, mh);
@@ -536,7 +596,7 @@
 	/* menu window */
 	swa.override_redirect = True;
 	swa.background_pixmap = ParentRelative;
-	swa.event_mask = ExposureMask | KeyPressMask | VisibilityChangeMask;
+	swa.event_mask = ButtonPressMask | ButtonReleaseMask | ExposureMask | KeyPressMask | VisibilityChangeMask;
 	win = XCreateWindow(dc->dpy, root, x, y, mw, mh, 0,
 	                    DefaultDepth(dc->dpy, screen), CopyFromParent,
 	                    DefaultVisual(dc->dpy, screen),