Change return type of tui_layout_base::adjust_size

This changes tui_layout_base::adjust_size to return a new enum type.
I broke this out into a separate patch because it simplifies a
subsequent patch.

gdb/ChangeLog
2020-02-22  Tom Tromey  <tom@tromey.com>

	* tui/tui-layout.h (enum tui_adjust_result): New.
	(class tui_layout_base) <adjust_size>: Return tui_adjust_result.
	(class tui_layout_window) <adjust_size>: Return
	tui_adjust_result.  Rewrite.
	(class tui_layout_split) <adjust_size>: Return tui_adjust_result.
	* tui/tui-layout.c (tui_layout_split::adjust_size): Update.

Change-Id: I821b48ab06a9b9485875e147bd08a3bc46b900a0

1 files changed, 16 insertions, 4 deletions

diff --git a/gdb/tui/tui-layout.h b/gdb/tui/tui-layout.h
index 4351e26..969e4df 100644
--- a/gdb/tui/tui-layout.h
+++ b/gdb/tui/tui-layout.h
@@ -27,6 +27,18 @@
 #include "tui/tui.h"
 #include "tui/tui-data.h"
 
+/* Values that can be returned when handling a request to adjust a
+   window's size.  */
+enum tui_adjust_result
+{
+  /* Requested window was not found here.  */
+  NOT_FOUND,
+  /* Window was found but not handled.  */
+  FOUND,
+  /* Window was found and handled.  */
+  HANDLED
+};
+
 /* The basic object in a TUI layout.  This represents a single piece
    of screen real estate.  Subclasses determine the exact
    behavior.  */
@@ -64,7 +76,7 @@ public:
 
   /* Adjust the size of the window named NAME to NEW_HEIGHT, updating
      the sizes of the other windows around it.  */
-  virtual bool adjust_size (const char *name, int new_height) = 0;
+  virtual tui_adjust_result adjust_size (const char *name, int new_height) = 0;
 
   /* Remove some windows from the layout, leaving the command window
      and the window being passed in here.  */
@@ -111,9 +123,9 @@ public:
     return m_contents.c_str ();
   }
 
-  bool adjust_size (const char *name, int new_height) override
+  tui_adjust_result adjust_size (const char *name, int new_height) override
   {
-    return false;
+    return m_contents == name ? FOUND : NOT_FOUND;
   }
 
   bool top_boxed_p () const override;
@@ -165,7 +177,7 @@ public:
 
   void apply (int x, int y, int width, int height) override;
 
-  bool adjust_size (const char *name, int new_height) override;
+  tui_adjust_result adjust_size (const char *name, int new_height) override;
 
   bool top_boxed_p () const override;