[metacity] libmetacity: don't expose MetaButton struct

[Alberts Muktupāvels <muktupavels src gnome org>]

commit 2ee0ffbee0b52cb8fc3112906bea1eaa737559f7
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Thu Aug 18 18:54:38 2016 +0300

    libmetacity: don't expose MetaButton struct

 libmetacity/Makefile.am                  |    1 +
 libmetacity/meta-button-layout-private.h |    2 +-
 libmetacity/meta-button-private.h        |   22 ++++++++++++++++++-
 libmetacity/meta-button.c                |   33 +++++++++++++++++++++++++++++
 libmetacity/meta-button.h                |   21 +++---------------
 libmetacity/meta-theme.c                 |   14 +++++-------
 libmetacity/meta-theme.h                 |    5 +--
 src/ui/frames.c                          |   34 +++++++++++++++---------------
 8 files changed, 85 insertions(+), 47 deletions(-)
---
diff --git a/libmetacity/Makefile.am b/libmetacity/Makefile.am
index c26d310..3620645 100644
--- a/libmetacity/Makefile.am
+++ b/libmetacity/Makefile.am
@@ -3,6 +3,7 @@ NULL =
 lib_LTLIBRARIES = libmetacity.la
 
 libmetacity_la_SOURCES = \
+       meta-button.c \
        meta-button.h \
        meta-button-layout.c \
        meta-button-layout-private.h \
diff --git a/libmetacity/meta-button-layout-private.h b/libmetacity/meta-button-layout-private.h
index 4926b1d..d4397ef 100644
--- a/libmetacity/meta-button-layout-private.h
+++ b/libmetacity/meta-button-layout-private.h
@@ -19,7 +19,7 @@
 #ifndef META_BUTTON_LAYOUT_PRIVATE_H
 #define META_BUTTON_LAYOUT_PRIVATE_H
 
-#include "meta-button.h"
+#include "meta-button-private.h"
 
 G_BEGIN_DECLS
 
diff --git a/libmetacity/meta-button-private.h b/libmetacity/meta-button-private.h
index d6e2ec6..f849e08 100644
--- a/libmetacity/meta-button-private.h
+++ b/libmetacity/meta-button-private.h
@@ -18,7 +18,7 @@
 #ifndef META_BUTTON_PRIVATE_H
 #define META_BUTTON_PRIVATE_H
 
-#include <glib.h>
+#include "meta-button.h"
 
 G_BEGIN_DECLS
 
@@ -47,6 +47,26 @@ typedef enum
   META_BUTTON_FUNCTION_LAST
 } MetaButtonFunction;
 
+struct _MetaButton
+{
+  MetaButtonType  type;
+  MetaButtonState state;
+
+  /* The computed size of a button (really just a way of tying its visible
+   * and clickable areas together). The reason for two different rectangles
+   * here is Fitts' law & maximized windows; See bug #97703 for more details.
+   */
+  struct {
+    /* The area where the button's image is drawn. */
+    GdkRectangle  visible;
+
+    /* The area where the button can be activated by clicking */
+    GdkRectangle clickable;
+  } rect;
+
+  gboolean       visible;
+};
+
 G_END_DECLS
 
 #endif
diff --git a/libmetacity/meta-button.c b/libmetacity/meta-button.c
new file mode 100644
index 0000000..e3d4e76
--- /dev/null
+++ b/libmetacity/meta-button.c
@@ -0,0 +1,33 @@
+/*
+ * Copyright (C) 2016 Alberts Muktupāvels
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include "meta-button-private.h"
+
+MetaButtonType
+meta_button_get_type (MetaButton *button)
+{
+  return button->type;
+}
+
+void
+meta_button_get_event_rect (MetaButton   *button,
+                            GdkRectangle *rect)
+{
+  *rect = button->rect.clickable;
+}
diff --git a/libmetacity/meta-button.h b/libmetacity/meta-button.h
index a087e14..9edf275 100644
--- a/libmetacity/meta-button.h
+++ b/libmetacity/meta-button.h
@@ -48,25 +48,12 @@ typedef enum
   META_BUTTON_STATE_LAST
 } MetaButtonState;
 
-typedef struct
-{
-  MetaButtonType  type;
-  MetaButtonState state;
-
-  /* The computed size of a button (really just a way of tying its visible
-   * and clickable areas together). The reason for two different rectangles
-   * here is Fitts' law & maximized windows; See bug #97703 for more details.
-   */
-  struct {
-    /* The area where the button's image is drawn. */
-    GdkRectangle  visible;
+typedef struct _MetaButton MetaButton;
 
-    /* The area where the button can be activated by clicking */
-    GdkRectangle clickable;
-  } rect;
+MetaButtonType meta_button_get_type       (MetaButton   *button);
 
-  gboolean       visible;
-} MetaButton;
+void           meta_button_get_event_rect (MetaButton   *button,
+                                           GdkRectangle *rect);
 
 G_END_DECLS
 
diff --git a/libmetacity/meta-theme.c b/libmetacity/meta-theme.c
index 7084ef4..bd03f05 100644
--- a/libmetacity/meta-theme.c
+++ b/libmetacity/meta-theme.c
@@ -570,11 +570,10 @@ meta_theme_set_button_layout (MetaTheme   *theme,
   theme->button_layout = meta_button_layout_new (button_layout, invert);
 }
 
-gboolean
-meta_theme_get_button (MetaTheme  *theme,
-                       gint        x,
-                       gint        y,
-                       MetaButton *button)
+MetaButton *
+meta_theme_get_button (MetaTheme *theme,
+                       gint       x,
+                       gint       y)
 {
   gint side;
 
@@ -618,13 +617,12 @@ meta_theme_get_button (MetaTheme  *theme,
           if (x >= rect.x && x < (rect.x + rect.width) &&
               y >= rect.y && y < (rect.y + rect.height))
             {
-              *button = *btn;
-              return TRUE;
+              return btn;
             }
         }
     }
 
-  return FALSE;
+  return NULL;
 }
 
 void
diff --git a/libmetacity/meta-theme.h b/libmetacity/meta-theme.h
index 4174ffe..f3228d4 100644
--- a/libmetacity/meta-theme.h
+++ b/libmetacity/meta-theme.h
@@ -113,10 +113,9 @@ void           meta_theme_set_button_layout (MetaTheme                   *theme,
                                              const gchar                 *button_layout,
                                              gboolean                     invert);
 
-gboolean       meta_theme_get_button        (MetaTheme                   *theme,
+MetaButton    *meta_theme_get_button        (MetaTheme                   *theme,
                                              gint                         x,
-                                             gint                         y,
-                                             MetaButton                  *button);
+                                             gint                         y);
 
 void           meta_theme_set_composited    (MetaTheme                   *theme,
                                              gboolean                     composited);
diff --git a/src/ui/frames.c b/src/ui/frames.c
index 3274142..31fe269 100644
--- a/src/ui/frames.c
+++ b/src/ui/frames.c
@@ -129,13 +129,12 @@ get_control (MetaFrames  *frames,
   GdkRectangle client;
   MetaFrameBorders borders;
   MetaTheme *theme;
-  MetaButton button;
+  MetaButton *button;
 
   meta_frames_calc_geometry (frames, frame, &fgeom);
   get_client_rect (&fgeom, &client);
 
   borders = fgeom.borders;
-  theme = meta_ui_get_theme ();
 
   if (x < borders.invisible.left - borders.resize.left ||
       y < borders.invisible.top - borders.resize.top ||
@@ -151,9 +150,12 @@ get_control (MetaFrames  *frames,
                  META_CORE_GET_FRAME_TYPE, &type,
                  META_CORE_GET_END);
 
-  if (meta_theme_get_button (theme, x, y, &button))
+  theme = meta_ui_get_theme ();
+  button = meta_theme_get_button (theme, x, y);
+
+  if (button != NULL)
     {
-      switch (button.type)
+      switch (meta_button_get_type (button))
         {
           case META_BUTTON_TYPE_CLOSE:
             return META_FRAME_CONTROL_DELETE;
@@ -290,9 +292,7 @@ get_control_rect (MetaFrameControl   control,
 {
   MetaButtonType type;
   MetaTheme *theme;
-  MetaButton button;
-
-  type = META_BUTTON_TYPE_LAST;
+  MetaButton *button;
 
   switch (control)
     {
@@ -356,22 +356,22 @@ get_control_rect (MetaFrameControl   control,
       case META_FRAME_CONTROL_RESIZE_E:
       case META_FRAME_CONTROL_NONE:
       default:
+        type = META_BUTTON_TYPE_LAST;
         break;
     }
 
+  if (type == META_BUTTON_TYPE_LAST)
+    return FALSE;
+
   theme = meta_ui_get_theme ();
+  button = meta_theme_get_button (theme, x, y);
 
-  if (type != META_BUTTON_TYPE_LAST &&
-      meta_theme_get_button (theme, x, y, &button))
-    {
-      if (type == button.type)
-        {
-          *rect = button.rect.clickable;
-          return TRUE;
-        }
-    }
+  if (button == NULL || meta_button_get_type (button) != type)
+    return FALSE;
 
-  return FALSE;
+  meta_button_get_event_rect (button, rect);
+
+  return TRUE;
 }
 
 static void