Simplify TUI boxing

In the TUI, whether or not a window can be boxed is a property of the
window's type.  This adds a can_box method to the window classes, and
changes tui_make_window to defer to this, removing the "box_it"
paramter.  This also lets us remove "enum tui_box", as it is no longer
used.

gdb/ChangeLog
2019-08-15  Tom Tromey  <tom@tromey.com>

	* tui/tui-wingeneral.h (tui_make_window): Update.
	* tui/tui-wingeneral.c (tui_make_window): Remove "box_it"
	parameter.
	(tui_gen_win_info::make_visible): Update.
	* tui/tui-regs.c (tui_data_window::display_registers_from):
	Update.
	* tui/tui-layout.c (show_source_disasm_command)
	(show_source_or_disasm_and_command): Update.
	* tui/tui-data.h (struct tui_gen_win_info) <can_box>: New method.
	(enum tui_box): Remove.
	(struct tui_win_info) <can_box>: New method.
	* tui/tui-command.h (struct tui_cmd_window) <can_box>: New
	method.

gdb/ChangeLog

@@ -1,3 +1,19 @@
+2019-08-15  Tom Tromey  <tom@tromey.com>
+
+	* tui/tui-wingeneral.h (tui_make_window): Update.
+	* tui/tui-wingeneral.c (tui_make_window): Remove "box_it"
+	parameter.
+	(tui_gen_win_info::make_visible): Update.
+	* tui/tui-regs.c (tui_data_window::display_registers_from):
+	Update.
+	* tui/tui-layout.c (show_source_disasm_command)
+	(show_source_or_disasm_and_command): Update.
+	* tui/tui-data.h (struct tui_gen_win_info) <can_box>: New method.
+	(enum tui_box): Remove.
+	(struct tui_win_info) <can_box>: New method.
+	* tui/tui-command.h (struct tui_cmd_window) <can_box>: New
+	method.
+
 2019-08-15  Tom de Vries  <tdevries@suse.de>
 
 	* linux-nat-trad.c: Include gdbarch.h.

gdb/tui/tui-command.h

@@ -55,6 +55,11 @@ struct tui_cmd_window : public tui_win_info
     return false;
   }
 
+  bool can_box () const override
+  {
+    return false;
+  }
+
   int start_line = 0;
 
 protected:

gdb/tui/tui-data.h

@@ -67,6 +67,12 @@ public:
   virtual void reset (int height, int width,
 		      int origin_x, int origin_y);
 
+  /* Return true if this can be boxed.  */
+  virtual bool can_box () const
+  {
+    return false;
+  }
+
   /* Window handle.  */
   WINDOW *handle = nullptr;
   /* Type of window.  */
@@ -85,13 +91,6 @@ public:
   char *title = nullptr;
 };
 
-/* Whether or not a window should be drawn with a box.  */
-enum tui_box
-{
-  DONT_BOX_WINDOW = 0,
-  BOX_WINDOW
-};
-
 /* Constant definitions.  */
 #define DEFAULT_TAB_LEN         8
 #define NO_SRC_STRING           "[ No Source Available ]"
@@ -248,6 +247,11 @@ public:
     return true;
   }
 
+  bool can_box () const override
+  {
+    return true;
+  }
+
   void check_and_display_highlight_if_needed ();
 
   /* Can this window ever be highlighted?  */

gdb/tui/tui-layout.c

@@ -546,7 +546,7 @@ show_source_disasm_command (void)
 		      tui_term_height () - cmd_height);
   /* FIXME tui_cmd_window won't recreate the handle on
      make_visible, so we need this instead.  */
-  tui_make_window (TUI_CMD_WIN, DONT_BOX_WINDOW);
+  tui_make_window (TUI_CMD_WIN);
   current_layout = SRC_DISASSEM_COMMAND;
 }
 
@@ -674,6 +674,6 @@ show_source_or_disasm_and_command (enum tui_layout_type layout_type)
 		      src_height);
   /* FIXME tui_cmd_window won't recreate the handle on
      make_visible, so we need this instead.  */
-  tui_make_window (TUI_CMD_WIN, DONT_BOX_WINDOW);
+  tui_make_window (TUI_CMD_WIN);
   current_layout = layout_type;
 }

gdb/tui/tui-regs.c

@@ -320,7 +320,7 @@ tui_data_window::display_registers_from (int start_element_no)
 		  data_item_win->width = item_win_width;
 		  data_item_win->origin.x = (item_win_width * j) + 1;
 		  data_item_win->origin.y = cur_y;
-		  tui_make_window (data_item_win, DONT_BOX_WINDOW);
+		  tui_make_window (data_item_win);
                   scrollok (data_item_win->handle, FALSE);
 		}
               touchwin (data_item_win->handle);

gdb/tui/tui-wingeneral.c

@@ -125,7 +125,7 @@ tui_win_info::check_and_display_highlight_if_needed ()
 
 
 void
-tui_make_window (struct tui_gen_win_info *win_info, enum tui_box box_it)
+tui_make_window (struct tui_gen_win_info *win_info)
 {
   WINDOW *handle;
 
@@ -136,7 +136,7 @@ tui_make_window (struct tui_gen_win_info *win_info, enum tui_box box_it)
   win_info->handle = handle;
   if (handle != NULL)
     {
-      if (box_it == BOX_WINDOW)
+      if (win_info->can_box ())
 	box_win (win_info, NO_HILITE);
       win_info->is_visible = true;
       scrollok (handle, TRUE);
@@ -155,8 +155,7 @@ tui_gen_win_info::make_visible (bool visible)
   is_visible = visible;
 
   if (visible)
-    tui_make_window (this, (tui_win_is_auxiliary (type)
-			    ? DONT_BOX_WINDOW : BOX_WINDOW));
+    tui_make_window (this);
   else
     {
       tui_delete_win (handle);

gdb/tui/tui-wingeneral.h

@@ -31,7 +31,7 @@ struct tui_gen_win_info;
 extern void tui_make_all_invisible (void);
 
 extern void tui_unhighlight_win (struct tui_win_info *);
-extern void tui_make_window (struct tui_gen_win_info *, enum tui_box);
+extern void tui_make_window (struct tui_gen_win_info *);
 extern void tui_highlight_win (struct tui_win_info *);
 extern void tui_refresh_all ();
 extern void tui_delete_win (WINDOW *window);