moving from https://github.com/perberos/mate-desktop-environment

1 files changed, 601 insertions, 0 deletions

diff --git a/src/ui/preview-widget.c b/src/ui/preview-widget.c
new file mode 100644
index 00000000..8fcd2517
--- /dev/null
+++ b/src/ui/preview-widget.c
@@ -0,0 +1,601 @@
+/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
+
+/* Marco theme preview widget */
+
+/* 
+ * Copyright (C) 2002 Havoc Pennington
+ * 
+ * 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, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+ * 02111-1307, USA.
+ */
+
+#define _GNU_SOURCE
+#define _XOPEN_SOURCE 600 /* for the maths routines over floats */
+
+#include <math.h>
+#include <gtk/gtk.h>
+#include "preview-widget.h"
+
+static void     meta_preview_class_init    (MetaPreviewClass *klass);
+static void     meta_preview_init          (MetaPreview      *preview);
+static void     meta_preview_size_request  (GtkWidget        *widget,
+                                            GtkRequisition   *req);
+static void     meta_preview_size_allocate (GtkWidget        *widget,
+                                            GtkAllocation    *allocation);
+static gboolean meta_preview_expose        (GtkWidget        *widget,
+                                            GdkEventExpose   *event);
+static void     meta_preview_finalize      (GObject          *object);
+
+static GtkWidgetClass *parent_class;
+
+GType
+meta_preview_get_type (void)
+{
+  static GType preview_type = 0;
+
+  if (!preview_type)
+    {
+      static const GtkTypeInfo preview_info =
+      {
+	"MetaPreview",
+	sizeof (MetaPreview),
+	sizeof (MetaPreviewClass),
+	(GtkClassInitFunc) meta_preview_class_init,
+	(GtkObjectInitFunc) meta_preview_init,
+	/* reserved_1 */ NULL,
+        /* reserved_2 */ NULL,
+        (GtkClassInitFunc) NULL,
+      };
+
+      preview_type = gtk_type_unique (GTK_TYPE_BIN, &preview_info);
+    }
+
+  return preview_type;
+}
+
+static void
+meta_preview_class_init (MetaPreviewClass *class)
+{
+  GObjectClass *gobject_class = G_OBJECT_CLASS (class);
+  GtkWidgetClass *widget_class;
+
+  widget_class = (GtkWidgetClass*) class;
+  parent_class = g_type_class_peek (GTK_TYPE_BIN);
+
+  gobject_class->finalize = meta_preview_finalize;
+
+  widget_class->expose_event = meta_preview_expose;
+  widget_class->size_request = meta_preview_size_request;
+  widget_class->size_allocate = meta_preview_size_allocate;
+}
+
+static void
+meta_preview_init (MetaPreview *preview)
+{
+  int i;
+  
+  gtk_widget_set_has_window (GTK_WIDGET (preview), FALSE);
+
+  i = 0;
+  while (i < MAX_BUTTONS_PER_CORNER)
+    {
+      preview->button_layout.left_buttons[i] = META_BUTTON_FUNCTION_LAST;
+      preview->button_layout.right_buttons[i] = META_BUTTON_FUNCTION_LAST;
+      ++i;
+    }
+  
+  preview->button_layout.left_buttons[0] = META_BUTTON_FUNCTION_MENU;
+
+  preview->button_layout.right_buttons[0] = META_BUTTON_FUNCTION_MINIMIZE;
+  preview->button_layout.right_buttons[1] = META_BUTTON_FUNCTION_MAXIMIZE;
+  preview->button_layout.right_buttons[2] = META_BUTTON_FUNCTION_CLOSE;
+  
+  preview->type = META_FRAME_TYPE_NORMAL;
+  preview->flags =
+    META_FRAME_ALLOWS_DELETE |
+    META_FRAME_ALLOWS_MENU |
+    META_FRAME_ALLOWS_MINIMIZE |
+    META_FRAME_ALLOWS_MAXIMIZE |
+    META_FRAME_ALLOWS_VERTICAL_RESIZE |
+    META_FRAME_ALLOWS_HORIZONTAL_RESIZE |
+    META_FRAME_HAS_FOCUS |
+    META_FRAME_ALLOWS_SHADE |
+    META_FRAME_ALLOWS_MOVE;
+  
+  preview->left_width = -1;
+  preview->right_width = -1;
+  preview->top_height = -1;
+  preview->bottom_height = -1;
+}
+
+GtkWidget*
+meta_preview_new (void)
+{
+  MetaPreview *preview;
+  
+  preview = gtk_type_new (META_TYPE_PREVIEW);
+  
+  return GTK_WIDGET (preview);
+}
+
+static void
+meta_preview_finalize (GObject *object)
+{
+  MetaPreview *preview;
+
+  preview = META_PREVIEW (object);
+
+  g_free (preview->title);
+  preview->title = NULL;
+  
+  G_OBJECT_CLASS (parent_class)->finalize (object);
+}
+
+static void
+ensure_info (MetaPreview *preview)
+{
+  GtkWidget *widget;
+
+  widget = GTK_WIDGET (preview);
+  
+  if (preview->layout == NULL)
+    {
+      PangoFontDescription *font_desc;
+      double scale;
+      PangoAttrList *attrs;
+      PangoAttribute *attr;
+
+      if (preview->theme)        
+        scale = meta_theme_get_title_scale (preview->theme,
+                                            preview->type,
+                                            preview->flags);
+      else
+        scale = 1.0;
+      
+      preview->layout = gtk_widget_create_pango_layout (widget,
+                                                        preview->title);
+      
+      font_desc = meta_gtk_widget_get_font_desc (widget, scale, NULL);
+      
+      preview->text_height =
+        meta_pango_font_desc_get_text_height (font_desc,
+                                              gtk_widget_get_pango_context (widget));
+          
+      attrs = pango_attr_list_new ();
+      
+      attr = pango_attr_size_new (pango_font_description_get_size (font_desc));
+      attr->start_index = 0;
+      attr->end_index = G_MAXINT;
+      
+      pango_attr_list_insert (attrs, attr);
+      
+      pango_layout_set_attributes (preview->layout, attrs);
+      
+      pango_attr_list_unref (attrs);      
+  
+      pango_font_description_free (font_desc);
+    }
+
+  if (preview->top_height < 0)
+    {
+      if (preview->theme)
+        {
+          meta_theme_get_frame_borders (preview->theme,
+                                        preview->type,
+                                        preview->text_height,
+                                        preview->flags,
+                                        &preview->top_height,
+                                        &preview->bottom_height,
+                                        &preview->left_width,
+                                        &preview->right_width);
+        }
+      else
+        {
+          preview->top_height = 0;
+          preview->bottom_height = 0;
+          preview->left_width = 0;
+          preview->right_width = 0;
+        }
+    }
+}
+
+static gboolean
+meta_preview_expose (GtkWidget      *widget,
+                     GdkEventExpose *event)
+{
+  MetaPreview *preview;
+  GtkAllocation allocation;
+  int border_width;
+  int client_width;
+  int client_height;
+  MetaButtonState button_states[META_BUTTON_TYPE_LAST] =
+  {
+    META_BUTTON_STATE_NORMAL,
+    META_BUTTON_STATE_NORMAL,
+    META_BUTTON_STATE_NORMAL,
+    META_BUTTON_STATE_NORMAL
+  };
+  
+  g_return_val_if_fail (META_IS_PREVIEW (widget), FALSE);
+  g_return_val_if_fail (event != NULL, FALSE);
+
+  preview = META_PREVIEW (widget);
+
+  ensure_info (preview);
+
+  border_width = gtk_container_get_border_width (GTK_CONTAINER (widget));
+  
+  gtk_widget_get_allocation (widget, &allocation);
+  client_width = allocation.width - preview->left_width - preview->right_width - border_width * 2;
+  client_height = allocation.height - preview->top_height - preview->bottom_height - border_width * 2;
+
+  if (client_width < 0)
+    client_width = 1;
+  if (client_height < 0)
+    client_height = 1;  
+  
+  if (preview->theme)
+    {
+      border_width = gtk_container_get_border_width (GTK_CONTAINER (widget));
+      
+      meta_theme_draw_frame (preview->theme,
+                             widget,
+                             gtk_widget_get_window (widget),
+                             &event->area,
+                             allocation.x + border_width,
+                             allocation.y + border_width,
+                             preview->type,
+                             preview->flags,
+                             client_width, client_height,
+                             preview->layout,
+                             preview->text_height,
+                             &preview->button_layout,
+                             button_states,
+                             meta_preview_get_mini_icon (),
+                             meta_preview_get_icon ());
+    }
+
+  /* draw child */
+  return GTK_WIDGET_CLASS (parent_class)->expose_event (widget, event);
+}
+
+static void
+meta_preview_size_request (GtkWidget      *widget,
+                           GtkRequisition *req)
+{
+  MetaPreview *preview;
+  GtkWidget *child;
+  guint border_width;
+
+  preview = META_PREVIEW (widget);
+
+  ensure_info (preview);
+
+  req->width = preview->left_width + preview->right_width;
+  req->height = preview->top_height + preview->bottom_height;
+  
+  child = gtk_bin_get_child (GTK_BIN (preview));
+  if (child &&
+      gtk_widget_get_visible (child))
+    {
+      GtkRequisition child_requisition;
+
+      gtk_widget_size_request (child, &child_requisition);
+
+      req->width += child_requisition.width;
+      req->height += child_requisition.height;
+    }
+  else
+    {
+#define NO_CHILD_WIDTH 80
+#define NO_CHILD_HEIGHT 20
+      req->width += NO_CHILD_WIDTH;
+      req->height += NO_CHILD_HEIGHT;
+    }
+
+  border_width = gtk_container_get_border_width (GTK_CONTAINER (widget));
+  req->width += border_width * 2;
+  req->height += border_width * 2;
+}
+
+static void
+meta_preview_size_allocate (GtkWidget         *widget,
+                            GtkAllocation     *allocation)
+{
+  MetaPreview *preview;
+  int border_width;
+  GtkAllocation child_allocation;
+  GtkWidget *child;
+  
+  preview = META_PREVIEW (widget);
+
+  ensure_info (preview);
+  
+  widget->allocation = *allocation;
+
+  border_width = gtk_container_get_border_width (GTK_CONTAINER (widget));
+  
+  child = gtk_bin_get_child (GTK_BIN (widget));
+  if (child &&
+      gtk_widget_get_visible (child))
+    {
+      child_allocation.x = widget->allocation.x + border_width + preview->left_width;
+      child_allocation.y = widget->allocation.y + border_width + preview->top_height;
+      
+      child_allocation.width = MAX (1, widget->allocation.width - border_width * 2 - preview->left_width - preview->right_width);
+      child_allocation.height = MAX (1, widget->allocation.height - border_width * 2 - preview->top_height - preview->bottom_height);
+
+      gtk_widget_size_allocate (gtk_bin_get_child (GTK_BIN (widget)), &child_allocation);
+    }
+}
+
+static void
+clear_cache (MetaPreview *preview)
+{
+  if (preview->layout)
+    {
+      g_object_unref (G_OBJECT (preview->layout));
+      preview->layout = NULL;
+    }
+
+  preview->left_width = -1;
+  preview->right_width = -1;
+  preview->top_height = -1;
+  preview->bottom_height = -1;
+}
+
+void
+meta_preview_set_theme (MetaPreview    *preview,
+                        MetaTheme      *theme)
+{
+  g_return_if_fail (META_IS_PREVIEW (preview));
+
+  preview->theme = theme;
+  
+  clear_cache (preview);
+
+  gtk_widget_queue_resize (GTK_WIDGET (preview));
+}
+
+void
+meta_preview_set_title (MetaPreview    *preview,
+                        const char     *title)
+{
+  g_return_if_fail (META_IS_PREVIEW (preview));
+
+  g_free (preview->title);
+  preview->title = g_strdup (title);
+  
+  clear_cache (preview);
+
+  gtk_widget_queue_resize (GTK_WIDGET (preview));
+}
+
+void
+meta_preview_set_frame_type (MetaPreview    *preview,
+                             MetaFrameType   type)
+{
+  g_return_if_fail (META_IS_PREVIEW (preview));
+
+  preview->type = type;
+
+  clear_cache (preview);
+
+  gtk_widget_queue_resize (GTK_WIDGET (preview));
+}
+
+void
+meta_preview_set_frame_flags (MetaPreview    *preview,
+                              MetaFrameFlags  flags)
+{
+  g_return_if_fail (META_IS_PREVIEW (preview));
+
+  preview->flags = flags;
+
+  clear_cache (preview);
+
+  gtk_widget_queue_resize (GTK_WIDGET (preview));
+}
+
+void
+meta_preview_set_button_layout (MetaPreview            *preview,
+                                const MetaButtonLayout *button_layout)
+{
+  g_return_if_fail (META_IS_PREVIEW (preview));
+  
+  preview->button_layout = *button_layout;  
+  
+  gtk_widget_queue_draw (GTK_WIDGET (preview));
+}
+
+GdkPixbuf*
+meta_preview_get_icon (void)
+{
+  static GdkPixbuf *default_icon = NULL;
+
+  if (default_icon == NULL)
+    {
+      GtkIconTheme *theme;
+      gboolean icon_exists;
+
+      theme = gtk_icon_theme_get_default ();
+
+      icon_exists = gtk_icon_theme_has_icon (theme, META_DEFAULT_ICON_NAME);
+
+      if (icon_exists)
+          default_icon = gtk_icon_theme_load_icon (theme,
+                                                   META_DEFAULT_ICON_NAME,
+                                                   META_ICON_WIDTH,
+                                                   0,
+                                                   NULL);
+      else
+          default_icon = gtk_icon_theme_load_icon (theme,
+                                                   "gtk-missing-image",
+                                                   META_ICON_WIDTH,
+                                                   0,
+                                                   NULL);
+
+      g_assert (default_icon);
+    }
+  
+  return default_icon;
+}
+
+GdkPixbuf*
+meta_preview_get_mini_icon (void)
+{
+  static GdkPixbuf *default_icon = NULL;
+
+  if (default_icon == NULL)
+    {
+      GtkIconTheme *theme;
+      gboolean icon_exists;
+
+      theme = gtk_icon_theme_get_default ();
+
+      icon_exists = gtk_icon_theme_has_icon (theme, META_DEFAULT_ICON_NAME);
+
+      if (icon_exists)
+          default_icon = gtk_icon_theme_load_icon (theme,
+                                                   META_DEFAULT_ICON_NAME,
+                                                   META_MINI_ICON_WIDTH,
+                                                   0,
+                                                   NULL);
+      else
+          default_icon = gtk_icon_theme_load_icon (theme,
+                                                   "gtk-missing-image",
+                                                   META_MINI_ICON_WIDTH,
+                                                   0,
+                                                   NULL);
+
+      g_assert (default_icon);
+    }
+  
+  return default_icon;
+}
+
+GdkRegion *
+meta_preview_get_clip_region (MetaPreview *preview, gint new_window_width, gint new_window_height)
+{
+  GdkRectangle xrect;
+  GdkRegion *corners_xregion, *window_xregion;
+  gint flags;
+  MetaFrameLayout *fgeom;
+  MetaFrameStyle *frame_style;
+
+  g_return_val_if_fail (META_IS_PREVIEW (preview), NULL);
+
+  flags = (META_PREVIEW (preview)->flags);
+
+  window_xregion = gdk_region_new ();
+
+  xrect.x = 0;
+  xrect.y = 0;
+  xrect.width = new_window_width;
+  xrect.height = new_window_height;
+
+  gdk_region_union_with_rect (window_xregion, &xrect);
+
+  if (preview->theme == NULL)
+    return window_xregion;
+
+  /* Otherwise, we do have a theme, so calculate the corners */
+  frame_style = meta_theme_get_frame_style (preview->theme,
+      META_FRAME_TYPE_NORMAL, flags);
+
+  fgeom = frame_style->layout;
+
+  corners_xregion = gdk_region_new ();
+
+  if (fgeom->top_left_corner_rounded_radius != 0)
+    {
+      const int corner = fgeom->top_left_corner_rounded_radius;
+      const float radius = sqrt(corner) + corner;
+      int i;
+
+      for (i=0; i<corner; i++)
+        {
+
+          const int width = floor(0.5 + radius - sqrt(radius*radius - (radius-(i+0.5))*(radius-(i+0.5))));
+          xrect.x = 0;
+          xrect.y = i;
+          xrect.width = width;
+          xrect.height = 1;
+
+          gdk_region_union_with_rect (corners_xregion, &xrect);
+        }
+    }
+
+  if (fgeom->top_right_corner_rounded_radius != 0)
+    {
+      const int corner = fgeom->top_right_corner_rounded_radius;
+      const float radius = sqrt(corner) + corner;
+      int i;
+
+      for (i=0; i<corner; i++)
+        {
+          const int width = floor(0.5 + radius - sqrt(radius*radius - (radius-(i+0.5))*(radius-(i+0.5))));
+          xrect.x = new_window_width - width;
+          xrect.y = i;
+          xrect.width = width;
+          xrect.height = 1;
+
+          gdk_region_union_with_rect (corners_xregion, &xrect);
+        }
+    }
+
+  if (fgeom->bottom_left_corner_rounded_radius != 0)
+    {
+      const int corner = fgeom->bottom_left_corner_rounded_radius;
+      const float radius = sqrt(corner) + corner;
+      int i;
+
+      for (i=0; i<corner; i++)
+        {
+          const int width = floor(0.5 + radius - sqrt(radius*radius - (radius-(i+0.5))*(radius-(i+0.5))));
+          xrect.x = 0;
+          xrect.y = new_window_height - i - 1;
+          xrect.width = width;
+          xrect.height = 1;
+
+          gdk_region_union_with_rect (corners_xregion, &xrect);
+        }
+    }
+
+  if (fgeom->bottom_right_corner_rounded_radius != 0)
+    {
+      const int corner = fgeom->bottom_right_corner_rounded_radius;
+      const float radius = sqrt(corner) + corner;
+      int i;
+
+      for (i=0; i<corner; i++)
+        {
+          const int width = floor(0.5 + radius - sqrt(radius*radius - (radius-(i+0.5))*(radius-(i+0.5))));
+          xrect.x = new_window_width - width;
+          xrect.y = new_window_height - i - 1;
+          xrect.width = width;
+          xrect.height = 1;
+
+          gdk_region_union_with_rect (corners_xregion, &xrect);
+        }
+    }
+
+  gdk_region_subtract (window_xregion, corners_xregion);
+  gdk_region_destroy (corners_xregion);
+
+  return window_xregion;
+}
+
+