Fix resize and change of scroll bar width for Gtk3.

* configure.in: Add emacsgtkfixed.o to GTK_OBJ if HAVE_GTK3.

* src/emacsgtkfixed.c, src/emacsgtkfixed.h: New files.

* src/gtkutil.c: Include src/emacsgtkfixed.h if HAVE_GTK3.
(int_gtk_range_get_value): Move to the scroll bar part of the file.
(style_changed_cb): Call update_theme_scrollbar_width and call
x_set_scroll_bar_default_width and xg_frame_set_char_size for
all frames.
(xg_create_frame_widgets): Call emacs_fixed_new if HAVE_GTK3 (Bug#8505).
Call gtk_window_set_resizable if HAVE_GTK3.
(x_wm_set_size_hint): Call emacs_fixed_set_min_size with min width
and height if HAVE_GTK3 (Bug#8505).
(scroll_bar_width_for_theme): New variable.
(update_theme_scrollbar_width): New function.
(xg_get_default_scrollbar_width): Move code to
update_theme_scrollbar_width, just return scroll_bar_width_for_theme.
(xg_initialize): Call update_theme_scrollbar_width.

* src/gtkutil.h (xg_get_default_scrollbar_width): Remove argument.

* src/xfns.c (x_set_scroll_bar_default_width): Remove argument to
xg_get_default_scrollbar_width.

8 files changed, 280 insertions, 14 deletions

diff --git a/ChangeLog b/ChangeLog
index 3e404183669..cd73001d541 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2011-06-14  Jan Djärv  <jan.h.d@swipnet.se>
+
+        * configure.in: Add emacsgtkfixed.o to GTK_OBJ if HAVE_GTK3.
+
 2011-06-08  Paul Eggert  <eggert@cs.ucla.edu>
 
         * lib/gnulib.mk, m4/gnulib-common.m4: Merge from gnulib.
diff --git a/configure.in b/configure.in
index 3d507789f22..9e7ea8522b2 100644
--- a/configure.in
+++ b/configure.in
@@ -1819,6 +1819,7 @@ fi
 
 
 HAVE_GTK=no
+GTK_OBJ=
 if test "${with_gtk3}" = "yes"; then
   GLIB_REQUIRED=2.28
   GTK_REQUIRED=3.0
@@ -1830,6 +1831,7 @@ if test "${with_gtk3}" = "yes"; then
      AC_MSG_ERROR($GTK_PKG_ERRORS)
   fi
   AC_DEFINE(HAVE_GTK3, 1, [Define to 1 if using GTK 3 or later.])
+  GTK_OBJ=emacsgtkfixed.o
 fi
 
 if test "$pkg_check_gtk" != "yes"; then
@@ -1847,7 +1849,6 @@ if test "${with_gtk}" = "yes" || test "$USE_X_TOOLKIT" = "maybe"; then
 fi
 fi
 
-GTK_OBJ=
 if test x"$pkg_check_gtk" = xyes; then
 
   AC_SUBST(GTK_CFLAGS)
@@ -1865,7 +1866,7 @@ if test x"$pkg_check_gtk" = xyes; then
   else
     HAVE_GTK=yes
     AC_DEFINE(USE_GTK, 1, [Define to 1 if using GTK.])
-    GTK_OBJ=gtkutil.o
+    GTK_OBJ="gtkutil.o $GTK_OBJ"
     USE_X_TOOLKIT=none
     if $PKG_CONFIG --atleast-version=2.10 gtk+-2.0; then
       :
diff --git a/src/ChangeLog b/src/ChangeLog
index 15b6bf6baf2..c72311c305f 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,3 +1,27 @@
+2011-06-14  Jan Djärv  <jan.h.d@swipnet.se>
+
+        * xfns.c (x_set_scroll_bar_default_width): Remove argument to
+        xg_get_default_scrollbar_width.
+
+        * gtkutil.c: Include emacsgtkfixed.h if HAVE_GTK3.
+        (int_gtk_range_get_value): Move to the scroll bar part of the file.
+        (style_changed_cb): Call update_theme_scrollbar_width and call
+        x_set_scroll_bar_default_width and xg_frame_set_char_size for
+        all frames (Bug#8505).
+        (xg_create_frame_widgets): Call emacs_fixed_new if HAVE_GTK3 (Bug#8505).
+        Call gtk_window_set_resizable if HAVE_GTK3.
+        (x_wm_set_size_hint): Call emacs_fixed_set_min_size with min width
+        and height if HAVE_GTK3 (Bug#8505).
+        (scroll_bar_width_for_theme): New variable.
+        (update_theme_scrollbar_width): New function.
+        (xg_get_default_scrollbar_width): Move code to
+        update_theme_scrollbar_width, just return scroll_bar_width_for_theme.
+        (xg_initialize): Call update_theme_scrollbar_width.
+
+        * gtkutil.h (xg_get_default_scrollbar_width): Remove argument.
+
+        * emacsgtkfixed.c, emacsgtkfixed.h: New files.
+
 2011-06-12  Martin Rudalics  <rudalics@gmx.at>
 
         * frame.c (make_frame): Call other_buffer_safely instead of
diff --git a/src/emacsgtkfixed.c b/src/emacsgtkfixed.c
new file mode 100644
index 00000000000..fe3514bce93
--- /dev/null
+++ b/src/emacsgtkfixed.c
@@ -0,0 +1,123 @@
+/* A Gtk Widget that inherits GtkFixed, but can be shrinked. 
+
+Copyright (C) 2011  Free Software Foundation, Inc.
+
+This file is part of GNU Emacs.
+
+GNU Emacs 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 3 of the License, or
+(at your option) any later version.
+
+GNU Emacs 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 GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#include "emacsgtkfixed.h"
+
+
+struct _EmacsFixedPrivate
+{
+  int minwidth, minheight;
+};
+
+
+static void emacs_fixed_get_preferred_width  (GtkWidget *widget,
+                                              gint      *minimum,
+                                              gint      *natural);
+static void emacs_fixed_get_preferred_height (GtkWidget *widget,
+                                              gint      *minimum,
+                                              gint      *natural);
+G_DEFINE_TYPE (EmacsFixed, emacs_fixed, GTK_TYPE_FIXED)
+
+static void
+emacs_fixed_class_init (EmacsFixedClass *klass)
+{
+  GtkWidgetClass *widget_class;
+  GtkFixedClass *fixed_class;
+
+  widget_class = (GtkWidgetClass*) klass;
+  fixed_class = (GtkFixedClass*) klass;
+
+  widget_class->get_preferred_width = emacs_fixed_get_preferred_width;
+  widget_class->get_preferred_height = emacs_fixed_get_preferred_height;
+  g_type_class_add_private (klass, sizeof (EmacsFixedPrivate));
+}
+
+static GType
+emacs_fixed_child_type (GtkFixed *container)
+{
+  return GTK_TYPE_WIDGET;
+}
+
+static void
+emacs_fixed_init (EmacsFixed *fixed)
+{
+  fixed->priv = G_TYPE_INSTANCE_GET_PRIVATE (fixed, EMACS_TYPE_FIXED,
+                                             EmacsFixedPrivate);
+  fixed->priv->minwidth = fixed->priv->minheight = 0;
+}
+
+/**
+ * emacs_fixed_new:
+ *
+ * Creates a new #EmacsFixed.
+ *
+ * Returns: a new #EmacsFixed.
+ */
+GtkWidget*
+emacs_fixed_new (void)
+{
+  return g_object_new (EMACS_TYPE_FIXED, NULL);
+}
+
+static GtkWidgetClass *
+get_parent_class (EmacsFixed *fixed)
+{
+  EmacsFixedClass *klass = EMACS_FIXED_GET_CLASS (fixed);
+  GtkFixedClass *parent_class = g_type_class_peek_parent (klass);
+  return (GtkWidgetClass*) parent_class;
+}
+
+static void
+emacs_fixed_get_preferred_width (GtkWidget *widget,
+                                 gint      *minimum,
+                                 gint      *natural)
+{
+  EmacsFixed *fixed = EMACS_FIXED (widget);
+  EmacsFixedPrivate *priv = fixed->priv;
+  GtkWidgetClass *widget_class = get_parent_class (fixed);
+  widget_class->get_preferred_width (widget, minimum, natural);
+  if (minimum) *minimum = priv->minwidth;
+}
+
+static void
+emacs_fixed_get_preferred_height (GtkWidget *widget,
+                                  gint      *minimum,
+                                  gint      *natural)
+{
+  EmacsFixed *fixed = EMACS_FIXED (widget);
+  EmacsFixedPrivate *priv = fixed->priv;
+  GtkWidgetClass *widget_class = get_parent_class (fixed);
+  widget_class->get_preferred_height (widget, minimum, natural);
+  if (minimum) *minimum = priv->minheight;
+}
+
+void
+emacs_fixed_set_min_size (EmacsFixed *widget, int width, int height)
+{
+  EmacsFixedPrivate *priv = widget->priv;
+  GtkWidgetClass *widget_class = get_parent_class (widget);
+  int mw, nw, mh, nh;
+
+  widget_class->get_preferred_height (GTK_WIDGET (widget), &mh, &nh);
+  widget_class->get_preferred_width (GTK_WIDGET (widget), &mw, &nw);
+
+  /* Gtk complains if min size is less than natural size.  */
+  if (width <= nw) priv->minwidth = width;
+  if (height <= nh) priv->minheight = height;
+}
diff --git a/src/emacsgtkfixed.h b/src/emacsgtkfixed.h
new file mode 100644
index 00000000000..405374373ec
--- /dev/null
+++ b/src/emacsgtkfixed.h
@@ -0,0 +1,58 @@
+/* A Gtk Widget that inherits GtkFixed, but can be shrinked. 
+
+Copyright (C) 2011  Free Software Foundation, Inc.
+
+This file is part of GNU Emacs.
+
+GNU Emacs 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 3 of the License, or
+(at your option) any later version.
+
+GNU Emacs 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 GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#ifndef EMACSGTKFIXED_H
+#define EMACSGTKFIXED_H
+
+#include <gtk/gtk.h>
+
+G_BEGIN_DECLS
+
+#define EMACS_TYPE_FIXED                  (emacs_fixed_get_type ())
+#define EMACS_FIXED(obj)                  (G_TYPE_CHECK_INSTANCE_CAST ((obj), EMACS_TYPE_FIXED, EmacsFixed))
+#define EMACS_FIXED_CLASS(klass)          (G_TYPE_CHECK_CLASS_CAST ((klass), EMACS_TYPE_FIXED, EmacsFixedClass))
+#define EMACS_IS_FIXED(obj)               (G_TYPE_CHECK_INSTANCE_TYPE ((obj), EMACS_TYPE_FIXED))
+#define EMACS_IS_FIXED_CLASS(klass)       (G_TYPE_CHECK_CLASS_TYPE ((klass), EMACS_TYPE_FIXED))
+#define EMACS_FIXED_GET_CLASS(obj)        (G_TYPE_INSTANCE_GET_CLASS ((obj), EMACS_TYPE_FIXED, EmacsFixedClass))
+
+typedef struct _EmacsFixed              EmacsFixed;
+typedef struct _EmacsFixedPrivate       EmacsFixedPrivate;
+typedef struct _EmacsFixedClass         EmacsFixedClass;
+
+struct _EmacsFixed
+{
+  GtkFixed container;
+
+  /*< private >*/
+  EmacsFixedPrivate *priv;
+};
+
+
+struct _EmacsFixedClass
+{
+  GtkFixedClass parent_class;
+};
+
+extern GtkWidget *emacs_fixed_new (void);
+extern void emacs_fixed_set_min_size (EmacsFixed *widget, int width, int height);
+extern GType emacs_fixed_get_type (void);
+
+G_END_DECLS
+
+#endif /* EMACSGTKFIXED_H */
diff --git a/src/gtkutil.c b/src/gtkutil.c
index dedb39a7a40..45f112ae9e5 100644
--- a/src/gtkutil.c
+++ b/src/gtkutil.c
@@ -42,6 +42,7 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 
 #ifdef HAVE_GTK3
 #include <gtk/gtkx.h>
+#include "emacsgtkfixed.h"
 #endif
 
 #define FRAME_TOTAL_PIXEL_HEIGHT(f) \
@@ -88,12 +89,7 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 
 #define XG_BIN_CHILD(x) gtk_bin_get_child (GTK_BIN (x))
 
-/* Get the current value of the range, truncated to an integer.  */
-static int
-int_gtk_range_get_value (GtkRange *range)
-{
-  return gtk_range_get_value (range);
-}
+static void update_theme_scrollbar_width (void);
 
 
 /***********************************************************************
@@ -1015,6 +1011,7 @@ style_changed_cb (GObject *go,
   struct input_event event;
   GdkDisplay *gdpy = (GdkDisplay *) user_data;
   const char *display_name = gdk_display_get_name (gdpy);
+  Display *dpy = GDK_DISPLAY_XDISPLAY (gdpy);
 
   EVENT_INIT (event);
   event.kind = CONFIG_CHANGED_EVENT;
@@ -1022,6 +1019,24 @@ style_changed_cb (GObject *go,
   /* Theme doesn't change often, so intern is called seldom.  */
   event.arg = intern ("theme-name");
   kbd_buffer_store_event (&event);
+
+  update_theme_scrollbar_width ();
+
+  /* If scroll bar width changed, we need set the new size on all frames
+     on this display.  */
+  if (dpy) 
+    {
+      Lisp_Object rest, frame;
+      FOR_EACH_FRAME (rest, frame)
+        {
+          FRAME_PTR f = XFRAME (frame);
+          if (FRAME_X_DISPLAY (f) == dpy)
+            {
+              x_set_scroll_bar_default_width (f);
+              xg_frame_set_char_size (f, FRAME_COLS (f), FRAME_LINES (f));
+            }
+        }
+    }
 }
 
 /* Called when a delete-event occurs on WIDGET.  */
@@ -1069,7 +1084,12 @@ xg_create_frame_widgets (FRAME_PTR f)
 
   wvbox = gtk_vbox_new (FALSE, 0);
   whbox = gtk_hbox_new (FALSE, 0);
-  wfixed = gtk_fixed_new ();  /* Must have this to place scroll bars  */
+
+#ifdef HAVE_GTK3
+  wfixed = emacs_fixed_new ();
+#else
+  wfixed = gtk_fixed_new ();
+#endif
 
   if (! wtop || ! wvbox || ! whbox || ! wfixed)
     {
@@ -1162,6 +1182,7 @@ xg_create_frame_widgets (FRAME_PTR f)
   gtk_widget_modify_style (wfixed, style);
 #else
   gtk_widget_set_can_focus (wfixed, TRUE);
+  gtk_window_set_resizable (GTK_WINDOW (wtop), TRUE);
 #endif
 
 #ifdef USE_GTK_TOOLTIP
@@ -1265,6 +1286,18 @@ x_wm_set_size_hint (FRAME_PTR f, long int flags, int user_position)
   size_hints.min_width  = base_width + min_cols * size_hints.width_inc;
   size_hints.min_height = base_height + min_rows * size_hints.height_inc;
 
+#ifdef HAVE_GTK3
+  /* Gtk3 ignores min width/height and overwrites them with its own idea
+     of min width/height.  Put out min values to the widget so Gtk
+     gets the same value we want it to be.  Without this, a user can't
+     shrink an Emacs frame.
+  */
+  if (FRAME_GTK_WIDGET (f))
+    emacs_fixed_set_min_size (EMACS_FIXED (FRAME_GTK_WIDGET (f)),
+                              size_hints.min_width,
+                              size_hints.min_height);
+#endif
+
   /* These currently have a one to one mapping with the X values, but I
      don't think we should rely on that.  */
   hint_flags |= GDK_HINT_WIN_GRAVITY;
@@ -3250,6 +3283,10 @@ xg_event_is_for_menubar (FRAME_PTR f, XEvent *event)
 
 int xg_ignore_gtk_scrollbar;
 
+/* The width of the scroll bar for the current theme.  */
+
+static int scroll_bar_width_for_theme;
+
 /* Xlib's `Window' fits in 32 bits.  But we want to store pointers, and they
    may be larger than 32 bits.  Keep a mapping from integer index to widget
    pointers to get around the 32 bit limitation.  */
@@ -3326,8 +3363,8 @@ xg_get_widget_from_map (int idx)
   return 0;
 }
 
-int
-xg_get_default_scrollbar_width (FRAME_PTR f)
+static void
+update_theme_scrollbar_width (void)
 {
 #ifdef HAVE_GTK3
   GtkAdjustment *vadj;
@@ -3336,13 +3373,22 @@ xg_get_default_scrollbar_width (FRAME_PTR f)
 #endif
   GtkWidget *wscroll;
   int w = 0, b = 0;
+
   vadj = gtk_adjustment_new (XG_SB_MIN, XG_SB_MIN, XG_SB_MAX, 0.1, 0.1, 0.1);
   wscroll = gtk_vscrollbar_new (GTK_ADJUSTMENT (vadj));
+  g_object_ref_sink (G_OBJECT (wscroll));
   gtk_widget_style_get (wscroll, "slider-width", &w, "trough-border", &b, NULL);
   gtk_widget_destroy (wscroll);
+  g_object_unref (G_OBJECT (wscroll));
   w += 2*b;
   if (w < 16) w = 16;
-  return w;
+  scroll_bar_width_for_theme = w;
+}
+
+int
+xg_get_default_scrollbar_width (void)
+{
+  return scroll_bar_width_for_theme;
 }
 
 /* Return the scrollbar id for X Window WID on display DPY.
@@ -3528,6 +3574,15 @@ xg_update_scrollbar_pos (FRAME_PTR f,
     }
 }
 
+/* Get the current value of the range, truncated to an integer.  */
+
+static int
+int_gtk_range_get_value (GtkRange *range)
+{
+  return gtk_range_get_value (range);
+}
+
+
 /* Set the thumb size and position of scroll bar BAR.  We are currently
    displaying PORTION out of a whole WHOLE, and our position POSITION.  */
 
@@ -4680,6 +4735,7 @@ xg_initialize (void)
                                           (GTK_TYPE_MENU_SHELL));
   gtk_binding_entry_add_signal (binding_set, GDK_KEY_g, GDK_CONTROL_MASK,
                                 "cancel", 0);
+  update_theme_scrollbar_width ();
 }
 
 #endif /* USE_GTK */
diff --git a/src/gtkutil.h b/src/gtkutil.h
index cf58d03b0ce..769e56da917 100644
--- a/src/gtkutil.h
+++ b/src/gtkutil.h
@@ -135,7 +135,7 @@ extern void xg_set_toolkit_scroll_bar_thumb (struct scroll_bar *bar,
                                              int position,
                                              int whole);
 extern int xg_event_is_for_scrollbar (FRAME_PTR f, XEvent *event);
-extern int xg_get_default_scrollbar_width (FRAME_PTR f);
+extern int xg_get_default_scrollbar_width (void);
 
 extern void update_frame_tool_bar (FRAME_PTR f);
 extern void free_frame_tool_bar (FRAME_PTR f);
diff --git a/src/xfns.c b/src/xfns.c
index 8417db7d6e5..5bc0cef6154 100644
--- a/src/xfns.c
+++ b/src/xfns.c
@@ -1701,7 +1701,7 @@ x_set_scroll_bar_default_width (struct frame *f)
   int wid = FRAME_COLUMN_WIDTH (f);
 #ifdef USE_TOOLKIT_SCROLL_BARS
 #ifdef USE_GTK
-  int minw = xg_get_default_scrollbar_width (f);
+  int minw = xg_get_default_scrollbar_width ();
 #else
   int minw = 16;
 #endif