add basic support for the mouse

Basic support for the mouse is provided to be able to activate a frame
when clicking on it.

To activate the behavior, the mousefocuspolicy variable must be set:

set mousefocuspolicy click

Currently mousefocuspolicy only accept two values: none (no mouse
support at all) and click (activate a frame on click).

src/actions.c

@@ -162,6 +162,7 @@ static cmdret * set_inputwidth (struct cmdarg **args);
 static cmdret * set_waitcursor (struct cmdarg **args);
 static cmdret * set_winfmt (struct cmdarg **args);
 static cmdret * set_winname (struct cmdarg **args);
+static cmdret * set_mousefocuspolicy (struct cmdarg **args);
 static cmdret * set_framefmt (struct cmdarg **args);
 static cmdret * set_fgcolor (struct cmdarg **args);
 static cmdret * set_bgcolor (struct cmdarg **args);
@@ -373,6 +374,7 @@ init_set_vars (void)
   add_set_var ("wingravity", set_wingravity, 1, "", arg_GRAVITY);
   add_set_var ("winliststyle", set_winliststyle, 1, "", arg_STRING);
   add_set_var ("winname", set_winname, 1, "", arg_STRING);
+  add_set_var ("mousefocuspolicy", set_mousefocuspolicy, 1, "", arg_STRING);
 }
 
 /* i_nrequired is the number required when called
@@ -1258,6 +1260,30 @@ ungrab_rat (void)
   XUngrabPointer (dpy, CurrentTime);
 }
 
+static void
+grab_button (void)
+{
+  int j;
+  for (j=0; j<num_screens; j++)
+    {
+      rp_screen *screen = &screens[j];
+      XGrabButton(dpy, AnyButton, AnyModifier, screen->root,
+                  True, ButtonPressMask,
+                  GrabModeSync, GrabModeAsync, None, None);
+    }
+}
+
+static void
+ungrab_button (void)
+{
+  int j;
+  for (j=0; j<num_screens; j++)
+    {
+      rp_screen *screen = &screens[j];
+      XUngrabButton(dpy, AnyButton, AnyModifier, screen->root);
+    }
+}
+
 /* Unmanage window */
 cmdret *
 cmd_unmanage (int interactive, struct cmdarg **args)
@@ -4303,6 +4329,42 @@ set_winname (struct cmdarg **args)
   return cmdret_new (RET_SUCCESS, NULL);
 }
 
+static cmdret *
+set_mousefocuspolicy(struct cmdarg **args)
+{
+  char *policy;
+
+  if (args[0] == NULL)
+    switch (defaults.mouse_focus_policy)
+      {
+      case MOUSE_FOCUS_POLICY_NONE:
+        return cmdret_new (RET_SUCCESS, "none");
+      case MOUSE_FOCUS_POLICY_CLICK:
+        return cmdret_new (RET_SUCCESS, "click");
+      default:
+        PRINT_DEBUG (("Unknown mouse_focus_policy\n"));
+        return cmdret_new (RET_FAILURE, "unknown");
+      }
+
+  policy = ARG_STRING(0);
+
+  if (!strncmp (policy, "none", sizeof ("none")))
+    {
+      defaults.mouse_focus_policy = MOUSE_FOCUS_POLICY_NONE;
+      ungrab_button();
+    }
+  else if (!strncmp (policy, "click", sizeof ("click")))
+    {
+      defaults.mouse_focus_policy = MOUSE_FOCUS_POLICY_CLICK;
+      grab_button();
+    }
+  else
+    return cmdret_new (RET_FAILURE,
+                       "set mousefocuspolicy: invalid argument `%s'", policy);
+
+  return cmdret_new (RET_SUCCESS, NULL);
+}
+
 static cmdret *
 set_framefmt (struct cmdarg **args)
 {

src/data.h

@@ -275,6 +275,9 @@ struct rp_defaults
 
   /* Frame indicator format */
   char *frame_fmt;
+
+  /* Window focus policy for the mouse: none or click */
+  int mouse_focus_policy;
 };
 
 /* Information about a child process. */

src/events.c

@@ -793,6 +793,19 @@ selection_clear (void)
   selection.len = 0;
 }
 
+static void
+button_press (XButtonEvent * ev)
+{
+  rp_frame * frame;
+
+  if (defaults.mouse_focus_policy == MOUSE_FOCUS_POLICY_CLICK)
+    {
+      frame = find_frame_at_cursor_pos (ev->x_root, ev->y_root);
+      if (frame)
+        set_active_frame(frame, 1);
+    }
+}
+
 /* Given an event, call the correct function to handle it. */
 static void
 delegate_event (XEvent *ev)
@@ -871,7 +884,12 @@ delegate_event (XEvent *ev)
       PRINT_DEBUG (("--- Handling ConfigureNotify ---\n"));
       configure_notify( &ev->xconfigure );
       break;
-
+
+    case ButtonPress:
+      XAllowEvents (dpy, ReplayPointer, CurrentTime); /* ReplayPointer resends the mouse event */
+      button_press(&ev->xbutton);
+      break;
+
     case MapNotify:
     case Expose:
     case MotionNotify:

src/globals.h

@@ -57,6 +57,10 @@
 #define WIN_NAME_RES_CLASS      1
 #define WIN_NAME_RES_NAME       2
 
+/* Possible values for defaults.mouse_focus_policy */
+#define MOUSE_FOCUS_POLICY_NONE  0
+#define MOUSE_FOCUS_POLICY_CLICK 1
+
 /* Possible directions to traverse the completions list. */
 #define COMPLETION_NEXT         0
 #define COMPLETION_PREVIOUS     1

src/main.c

@@ -583,6 +583,8 @@ init_defaults (void)
   defaults.history_expansion = False;
   defaults.frame_selectors = xstrdup ("");
   defaults.maxundos = 20;
+
+  defaults.mouse_focus_policy = MOUSE_FOCUS_POLICY_NONE;
 }
 
 int

src/screen.c

@@ -269,7 +269,7 @@ init_screen (rp_screen *s, int screen_num)
   XSelectInput(dpy, RootWindow (dpy, screen_num),
                PropertyChangeMask | ColormapChangeMask
 	       | SubstructureRedirectMask | SubstructureNotifyMask
-	       | StructureNotifyMask);
+	       | StructureNotifyMask | ButtonPressMask);
   XSync (dpy, False);
 
   /* Set the numset for the frames to our global numset. */

src/split.c

@@ -1088,3 +1088,24 @@ find_frame_number (int num)
 
   return NULL;
 }
+
+rp_frame *
+find_frame_at_cursor_pos (int x, int y)
+{
+  int i;
+  rp_frame *cur;
+
+  for (i=0; i<num_screens; i++)
+    {
+      rp_screen *s = &screens[i];
+
+      list_for_each_entry (cur, &s->frames, node)
+        {
+          if (x >= (s->left + cur->x) && x <= (s->left + cur->x + cur->width)
+              && y >= (s->top + cur->y) && y <= (s->top + cur->y + cur->height))
+            return cur;
+        }
+    }
+
+  return NULL;
+}

src/split.h

@@ -56,5 +56,6 @@ rp_frame *find_last_frame (void);
 rp_frame * find_frame_number (int num);
 
 rp_frame *current_frame (void);
+rp_frame *find_frame_at_cursor_pos (int x, int y);
 
 #endif