[PATCH 10/24] Change return type of tui_layout_base::adjust_size

[Tom Tromey <tom@tromey.com>]

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
2020-01-04  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
---
 gdb/ChangeLog        |  9 +++++++++
 gdb/tui/tui-layout.c | 17 +++++++++--------
 gdb/tui/tui-layout.h | 20 ++++++++++++++++----
 3 files changed, 34 insertions(+), 12 deletions(-)

diff --git a/gdb/tui/tui-layout.c b/gdb/tui/tui-layout.c
index 3604d7e06bc..be6c754d022 100644
--- a/gdb/tui/tui-layout.c
+++ b/gdb/tui/tui-layout.c
@@ -487,7 +487,7 @@ tui_layout_split::set_weights_from_heights ()
 
 /* See tui-layout.h.  */
 
-bool
+tui_adjust_result
 tui_layout_split::adjust_size (const char *name, int new_height)
 {
   /* Look through the children.  If one is a layout holding the named
@@ -496,10 +496,11 @@ tui_layout_split::adjust_size (const char *name, int new_height)
   int found_index = -1;
   for (int i = 0; i < m_splits.size (); ++i)
     {
-      if (m_splits[i].layout->adjust_size (name, new_height))
-	return true;
-      const char *win_name = m_splits[i].layout->get_name ();
-      if (win_name != nullptr && strcmp (name, win_name) == 0)
+      tui_adjust_result adjusted
+	= m_splits[i].layout->adjust_size (name, new_height);
+      if (adjusted == HANDLED)
+	return HANDLED;
+      if (adjusted == FOUND)
 	{
 	  found_index = i;
 	  break;
@@ -507,9 +508,9 @@ tui_layout_split::adjust_size (const char *name, int new_height)
     }
 
   if (found_index == -1)
-    return false;
+    return NOT_FOUND;
   if (m_splits[found_index].layout->height == new_height)
-    return true;
+    return HANDLED;
 
   set_weights_from_heights ();
   int delta = m_splits[found_index].weight - new_height;
@@ -557,7 +558,7 @@ tui_layout_split::adjust_size (const char *name, int new_height)
       apply (x, y, width, height);
     }
 
-  return true;
+  return HANDLED;
 }
 
 /* See tui-layout.h.  */
diff --git a/gdb/tui/tui-layout.h b/gdb/tui/tui-layout.h
index 4351e260720..969e4dfd231 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;
 
-- 
2.17.2