[mutter/wip/tiling: 6/6] frame: Don't allow resizing of edges that are constrained

[Jasper St. Pierre <jstpierre src gnome org>]

commit 60fd84f1f28bba539d299d0474562661ddd6576a
Author: Jasper St. Pierre <jstpierre mecheye net>
Date:   Tue Jun 30 22:14:03 2015 -0700

    frame: Don't allow resizing of edges that are constrained

 src/core/frame.c  |   12 ++++++++++++
 src/meta/common.h |    6 +++++-
 src/ui/theme.c    |   13 ++++++++-----
 3 files changed, 25 insertions(+), 6 deletions(-)
---
diff --git a/src/core/frame.c b/src/core/frame.c
index c4be91a..81e0e68 100644
--- a/src/core/frame.c
+++ b/src/core/frame.c
@@ -283,6 +283,18 @@ meta_frame_get_flags (MetaFrame *frame)
   if (frame->window->wm_state_above)
     flags |= META_FRAME_ABOVE;
 
+  if (frame->window->constrained_edges & META_DIRECTION_LEFT)
+    flags |= META_FRAME_CONSTRAINED_LEFT_EDGE;
+
+  if (frame->window->constrained_edges & META_DIRECTION_RIGHT)
+    flags |= META_FRAME_CONSTRAINED_RIGHT_EDGE;
+
+  if (frame->window->constrained_edges & META_DIRECTION_TOP)
+    flags |= META_FRAME_CONSTRAINED_TOP_EDGE;
+
+  if (frame->window->constrained_edges & META_DIRECTION_BOTTOM)
+    flags |= META_FRAME_CONSTRAINED_BOTTOM_EDGE;
+
   return flags;
 }
 
diff --git a/src/meta/common.h b/src/meta/common.h
index bf87b35..74f7386 100644
--- a/src/meta/common.h
+++ b/src/meta/common.h
@@ -83,7 +83,11 @@ typedef enum
   META_FRAME_IS_FLASHING              = 1 << 14,
   META_FRAME_ABOVE                    = 1 << 15,
   META_FRAME_TILED_LEFT               = 1 << 16,
-  META_FRAME_TILED_RIGHT              = 1 << 17
+  META_FRAME_TILED_RIGHT              = 1 << 17,
+  META_FRAME_CONSTRAINED_LEFT_EDGE    = 1 << 18,
+  META_FRAME_CONSTRAINED_RIGHT_EDGE   = 1 << 19,
+  META_FRAME_CONSTRAINED_TOP_EDGE     = 1 << 20,
+  META_FRAME_CONSTRAINED_BOTTOM_EDGE  = 1 << 21,
 } MetaFrameFlags;
 
 /**
diff --git a/src/ui/theme.c b/src/ui/theme.c
index be2460c..8711352 100644
--- a/src/ui/theme.c
+++ b/src/ui/theme.c
@@ -94,19 +94,22 @@ meta_frame_layout_get_borders (const MetaFrameLayout *layout,
 
   if (flags & META_FRAME_ALLOWS_HORIZONTAL_RESIZE)
     {
-      borders->invisible.left   = MAX (0, draggable_borders - borders->visible.left);
-      borders->invisible.right  = MAX (0, draggable_borders - borders->visible.right);
+      if (!(flags & META_FRAME_CONSTRAINED_LEFT_EDGE))
+        borders->invisible.left   = MAX (0, draggable_borders - borders->visible.left);
+      if (!(flags & META_FRAME_CONSTRAINED_RIGHT_EDGE))
+        borders->invisible.right  = MAX (0, draggable_borders - borders->visible.right);
     }
 
   if (flags & META_FRAME_ALLOWS_VERTICAL_RESIZE)
     {
-      borders->invisible.bottom = MAX (0, draggable_borders - borders->visible.bottom);
-
       /* borders.visible.top is the height of the *title bar*. We can't do the same
        * algorithm here, titlebars are expectedly much bigger. Just subtract a couple
        * pixels to get a proper feel. */
-      if (type != META_FRAME_TYPE_ATTACHED)
+      if (!(flags & META_FRAME_CONSTRAINED_TOP_EDGE) && type != META_FRAME_TYPE_ATTACHED)
         borders->invisible.top    = MAX (0, draggable_borders - 2);
+
+      if (!(flags & META_FRAME_CONSTRAINED_BOTTOM_EDGE))
+        borders->invisible.bottom = MAX (0, draggable_borders - borders->visible.bottom);
     }
 
   borders->total.left   = borders->invisible.left   + borders->visible.left;