[libgd/wip/rishi/main-box: 5/7] Add GdMainBox



commit 8804caed9d7bff5f6d31fe924867efb597517dc0
Author: Debarshi Ray <debarshir gnome org>
Date:   Wed Nov 23 14:43:21 2016 +0100

    Add GdMainBox
    
    https://bugzilla.gnome.org/show_bug.cgi?id=774914

 libgd/gd-main-box.c | 1084 +++++++++++++++++++++++++++++++++++++++++++++++++++
 libgd/gd-main-box.h |   64 +++
 2 files changed, 1148 insertions(+), 0 deletions(-)
---
diff --git a/libgd/gd-main-box.c b/libgd/gd-main-box.c
new file mode 100644
index 0000000..3cc16d8
--- /dev/null
+++ b/libgd/gd-main-box.c
@@ -0,0 +1,1084 @@
+/*
+ * Copyright (c) 2016 Red Hat, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser 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 Lesser General Public 
+ * License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License 
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * Author: Debarshi Ray <debarshir gnome org>
+ *
+ */
+
+#include "gd-main-box.h"
+
+#include <cairo-gobject.h>
+
+#define MAIN_BOX_TYPE_INITIAL -1
+#define MAIN_BOX_DND_ICON_OFFSET 20
+#define MAIN_BOX_RUBBERBAND_SELECT_TRIGGER_LENGTH 32
+
+typedef struct _GdMainBoxPrivate GdMainBoxPrivate;
+
+struct _GdMainBoxPrivate
+{
+  GdMainBoxType current_type;
+  gboolean selection_mode;
+
+  GtkWidget *current_view;
+  GListModel *model;
+
+  gboolean track_motion;
+  gboolean rubberband_select;
+  GtkTreePath *rubberband_select_first_path;
+  GtkTreePath *rubberband_select_last_path;
+  int button_down_x;
+  int button_down_y;
+
+  gchar *button_press_item_path;
+
+  gchar *last_selected_id;
+};
+
+enum {
+  PROP_BOX_TYPE = 1,
+  PROP_SELECTION_MODE,
+  PROP_MODEL,
+  NUM_PROPERTIES
+};
+
+enum {
+  ITEM_ACTIVATED = 1,
+  SELECTION_MODE_REQUEST,
+  VIEW_SELECTION_CHANGED,
+  NUM_SIGNALS
+};
+
+static GParamSpec *properties[NUM_PROPERTIES] = { NULL, };
+static guint signals[NUM_SIGNALS] = { 0, };
+
+G_DEFINE_TYPE_WITH_PRIVATE (GdMainBox, gd_main_box, GTK_TYPE_SCROLLED_WINDOW)
+
+static void
+gd_main_box_dispose (GObject *obj)
+{
+  GdMainBox *self = GD_MAIN_BOX (obj);
+  GdMainBoxPrivate *priv;
+
+  priv = gd_main_box_get_instance_private (self);
+
+  g_clear_object (&priv->model);
+
+  G_OBJECT_CLASS (gd_main_box_parent_class)->dispose (obj);
+}
+
+static void
+gd_main_box_finalize (GObject *obj)
+{
+  GdMainBox *self = GD_MAIN_BOX (obj);
+  GdMainBoxPrivate *priv;
+
+  priv = gd_main_box_get_instance_private (self);
+
+  g_free (priv->button_press_item_path);
+  g_free (priv->last_selected_id);
+
+  if (priv->rubberband_select_first_path)
+    gtk_tree_path_free (priv->rubberband_select_first_path);
+
+  if (priv->rubberband_select_last_path)
+    gtk_tree_path_free (priv->rubberband_select_last_path);
+
+  G_OBJECT_CLASS (gd_main_box_parent_class)->finalize (obj);
+}
+
+static void
+gd_main_box_init (GdMainBox *self)
+{
+  GdMainBoxPrivate *priv;
+  GtkStyleContext *context;
+
+  priv = gd_main_box_get_instance_private (self);
+
+  /* so that we get constructed with the right view even at startup */
+  priv->current_type = MAIN_BOX_TYPE_INITIAL;
+
+  gtk_widget_set_hexpand (GTK_WIDGET (self), TRUE);
+  gtk_widget_set_vexpand (GTK_WIDGET (self), TRUE);
+  gtk_scrolled_window_set_shadow_type (GTK_SCROLLED_WINDOW (self), GTK_SHADOW_IN);
+  gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (self), GTK_POLICY_NEVER, GTK_POLICY_AUTOMATIC);
+
+  context = gtk_widget_get_style_context (GTK_WIDGET (self));
+  gtk_style_context_add_class (context, "documents-scrolledwin");
+}
+
+static void
+gd_main_box_get_property (GObject    *object,
+                           guint       property_id,
+                           GValue     *value,
+                           GParamSpec *pspec)
+{
+  GdMainBox *self = GD_MAIN_BOX (object);
+
+  switch (property_id)
+    {
+    case PROP_BOX_TYPE:
+      g_value_set_int (value, gd_main_box_get_box_type (self));
+      break;
+    case PROP_SELECTION_MODE:
+      g_value_set_boolean (value, gd_main_box_get_selection_mode (self));
+      break;
+    case PROP_MODEL:
+      g_value_set_object (value, gd_main_box_get_model (self));
+      break;
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+    }
+}
+
+static void
+gd_main_box_set_property (GObject    *object,
+                           guint       property_id,
+                           const GValue *value,
+                           GParamSpec *pspec)
+{
+  GdMainBox *self = GD_MAIN_BOX (object);
+
+  switch (property_id)
+    {
+    case PROP_BOX_TYPE:
+      gd_main_box_set_box_type (self, g_value_get_int (value));
+      break;
+    case PROP_SELECTION_MODE:
+      gd_main_box_set_selection_mode (self, g_value_get_boolean (value));
+      break;
+    case PROP_MODEL:
+      gd_main_box_set_model (self, g_value_get_object (value));
+      break;
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+    }
+}
+
+static void
+gd_main_box_class_init (GdMainBoxClass *klass)
+{
+  GObjectClass *oclass = G_OBJECT_CLASS (klass);
+
+  oclass->get_property = gd_main_box_get_property;
+  oclass->set_property = gd_main_box_set_property;
+  oclass->dispose = gd_main_box_dispose;
+  oclass->finalize = gd_main_box_finalize;
+
+  properties[PROP_BOX_TYPE] = g_param_spec_int ("box-type",
+                                                "Box type",
+                                                "Box type",
+                                                GD_MAIN_BOX_ICON,
+                                                GD_MAIN_BOX_LIST,
+                                                GD_MAIN_BOX_ICON,
+                                                G_PARAM_READWRITE |
+                                                G_PARAM_CONSTRUCT |
+                                                G_PARAM_STATIC_STRINGS);
+
+  properties[PROP_SELECTION_MODE] = g_param_spec_boolean ("selection-mode",
+                                                          "Selection mode",
+                                                          "Whether the view is in selection mode",
+                                                          FALSE,
+                                                          G_PARAM_READWRITE |
+                                                          G_PARAM_CONSTRUCT |
+                                                          G_PARAM_STATIC_STRINGS);
+
+  properties[PROP_MODEL] = g_param_spec_object ("model",
+                                                "Model",
+                                                "The GListModel",
+                                                G_TYPE_LIST_MODEL,
+                                                G_PARAM_READWRITE |
+                                                G_PARAM_CONSTRUCT |
+                                                G_PARAM_STATIC_STRINGS);
+
+  signals[ITEM_ACTIVATED] = g_signal_new ("item-activated",
+                                          GD_TYPE_MAIN_BOX,
+                                          G_SIGNAL_RUN_LAST,
+                                          0,
+                                          NULL,
+                                          NULL,
+                                          NULL,
+                                          G_TYPE_NONE,
+                                          2,
+                                          GD_TYPE_MAIN_BOX_DISPLAYABLE,
+                                          G_TYPE_UINT);
+
+  signals[SELECTION_MODE_REQUEST] = g_signal_new ("selection-mode-request",
+                                                  GD_TYPE_MAIN_BOX,
+                                                  G_SIGNAL_RUN_LAST,
+                                                  0,
+                                                  NULL,
+                                                  NULL,
+                                                  NULL,
+                                                  G_TYPE_NONE,
+                                                  0);
+
+  signals[VIEW_SELECTION_CHANGED] = g_signal_new ("view-selection-changed",
+                                                  GD_TYPE_MAIN_BOX,
+                                                  G_SIGNAL_RUN_LAST,
+                                                  0,
+                                                  NULL,
+                                                  NULL,
+                                                  NULL,
+                                                  G_TYPE_NONE,
+                                                  0);
+
+  g_object_class_install_properties (oclass, NUM_PROPERTIES, properties);
+}
+
+static cairo_surface_t *
+gd_main_box_get_counter_icon (GdMainBox *self,
+                               cairo_surface_t *base,
+                               gint number)
+{
+  GtkStyleContext *context;
+  cairo_t *cr, *emblem_cr;
+  cairo_surface_t *surface, *emblem_surface;
+  gint width, height;
+  gint layout_width, layout_height;
+  gint emblem_size;
+  gdouble scale;
+  gchar *str;
+  PangoLayout *layout;
+  PangoAttrList *attr_list;
+  PangoAttribute *attr;
+  PangoFontDescription *desc;
+  GdkRGBA color;
+
+  context = gtk_widget_get_style_context (GTK_WIDGET (self));
+  gtk_style_context_save (context);
+  gtk_style_context_add_class (context, "documents-counter");
+
+  width = cairo_image_surface_get_width (base);
+  height = cairo_image_surface_get_height (base);
+
+  surface = cairo_surface_create_similar (base, CAIRO_CONTENT_COLOR_ALPHA,
+                                          width, height);
+  cr = cairo_create (surface);
+  cairo_set_source_surface (cr, base, 0, 0);
+  cairo_paint (cr);
+
+  emblem_size = MIN (width / 2, height / 2);
+  emblem_surface = cairo_surface_create_similar (base, CAIRO_CONTENT_COLOR_ALPHA,
+                                                 emblem_size, emblem_size);
+  emblem_cr = cairo_create (emblem_surface);
+  gtk_render_background (context, emblem_cr,
+                         0, 0, emblem_size, emblem_size);
+
+  if (number > 99)
+    number = 99;
+  if (number < -99)
+    number = -99;
+
+  str = g_strdup_printf ("%d", number);
+  layout = gtk_widget_create_pango_layout (GTK_WIDGET (self), str);
+  g_free (str);
+
+  pango_layout_get_pixel_size (layout, &layout_width, &layout_height);
+
+  /* scale the layout to be 0.5 of the size still available for drawing */
+  scale = (emblem_size * 0.50) / (MAX (layout_width, layout_height));
+  attr_list = pango_attr_list_new ();
+
+  attr = pango_attr_scale_new (scale);
+  pango_attr_list_insert (attr_list, attr);
+  pango_layout_set_attributes (layout, attr_list);
+
+  gtk_style_context_get (context, GTK_STATE_FLAG_NORMAL, "font", &desc, NULL);
+  pango_layout_set_font_description (layout, desc);
+  pango_font_description_free (desc);
+
+  gtk_style_context_get_color (context, 0, &color);
+  gdk_cairo_set_source_rgba (emblem_cr, &color);
+
+  /* update these values */
+  pango_layout_get_pixel_size (layout, &layout_width, &layout_height);
+
+  cairo_move_to (emblem_cr,
+                 emblem_size / 2 - layout_width / 2,
+                 emblem_size / 2 - layout_height / 2);
+
+  pango_cairo_show_layout (emblem_cr, layout);
+
+  g_object_unref (layout);
+  pango_attr_list_unref (attr_list);
+  cairo_destroy (emblem_cr);
+
+  cairo_set_source_surface (cr, emblem_surface, 
+                            width - emblem_size, height - emblem_size);
+  cairo_paint (cr);
+  cairo_destroy (cr);
+
+  cairo_surface_destroy (emblem_surface);
+  gtk_style_context_restore (context);
+
+  return surface;
+}
+
+static GdMainBoxGeneric *
+get_generic (GdMainBox *self)
+{
+  GdMainBoxPrivate *priv;
+
+  priv = gd_main_box_get_instance_private (self);
+
+  if (priv->current_view != NULL)
+    return GD_MAIN_BOX_GENERIC (priv->current_view);
+
+  return NULL;
+}
+
+static void
+do_select_row (GdMainBox *self,
+               GtkTreeIter *iter,
+               gboolean value)
+{
+  GdMainBoxPrivate *priv;
+  GtkTreeModel *model;
+  GtkTreeIter my_iter;
+  GtkTreePath *path;
+
+  priv = gd_main_box_get_instance_private (self);
+
+  model = priv->model;
+  my_iter = *iter;
+
+  while (GTK_IS_TREE_MODEL_FILTER (model) ||
+         GTK_IS_TREE_MODEL_SORT (model))
+    {
+      GtkTreeIter child_iter;
+
+      if (GTK_IS_TREE_MODEL_FILTER (model))
+        {
+          GtkTreeModelFilter *filter;
+
+          filter = GTK_TREE_MODEL_FILTER (model);
+          gtk_tree_model_filter_convert_iter_to_child_iter (filter, &child_iter, &my_iter);
+          model = gtk_tree_model_filter_get_model (filter);
+        }
+      else
+        {
+          GtkTreeModelSort *sort;
+
+          sort = GTK_TREE_MODEL_SORT (model);
+          gtk_tree_model_sort_convert_iter_to_child_iter (sort, &child_iter, &my_iter);
+          model = gtk_tree_model_sort_get_model (sort);
+        }
+
+      my_iter = child_iter;
+    }
+
+  if (GTK_IS_LIST_STORE (model))
+    {
+      gtk_list_store_set (GTK_LIST_STORE (model), &my_iter,
+                          GD_MAIN_COLUMN_SELECTED, value,
+                          -1);
+    }
+  else
+    {
+      gtk_tree_store_set (GTK_TREE_STORE (model), &my_iter,
+                          GD_MAIN_COLUMN_SELECTED, value,
+                          -1);
+    }
+
+  /* And tell the view model that something changed */
+  path = gtk_tree_model_get_path (priv->model, iter);
+  if (path)
+    {
+      gtk_tree_model_row_changed (priv->model, path, iter);
+      gtk_tree_path_free (path);
+    }
+}
+
+static void
+selection_mode_do_select_range (GdMainBox *self,
+                                GtkTreeIter *first_element,
+                                GtkTreeIter *last_element)
+{
+  GdMainBoxPrivate *priv;
+  GtkTreeIter iter;
+  GtkTreePath *path, *last_path;
+  gboolean equal;
+
+  priv = gd_main_box_get_instance_private (self);
+
+  path = gtk_tree_model_get_path (priv->model, first_element);
+  last_path = gtk_tree_model_get_path (priv->model, last_element);
+  if (gtk_tree_path_compare (path, last_path) > 0)
+    {
+      gtk_tree_path_free (last_path);
+      last_path = path;
+      iter = *last_element;
+    }
+  else
+    {
+      gtk_tree_path_free (path);
+      iter = *first_element;
+    }
+
+  do
+    {
+      do_select_row (self, &iter, TRUE);
+
+      path = gtk_tree_model_get_path (priv->model, &iter);
+      equal = (gtk_tree_path_compare (path, last_path) == 0);
+      gtk_tree_path_free (path);
+
+      if (equal)
+        break;
+    }
+  while (gtk_tree_model_iter_next (priv->model, &iter));
+
+  gtk_tree_path_free (last_path);
+}
+
+static void
+selection_mode_select_range (GdMainBox *self,
+                             GtkTreeIter *iter)
+{
+  GdMainBoxPrivate *priv;
+  GtkTreeIter other;
+  gboolean found = FALSE;
+  gboolean selected;
+  char *id;
+
+  priv = gd_main_box_get_instance_private (self);
+
+  if (priv->last_selected_id != NULL &&
+      gtk_tree_model_get_iter_first (priv->model, &other))
+    {
+      do
+       {
+         gtk_tree_model_get (priv->model, &other,
+                             GD_MAIN_COLUMN_ID, &id,
+                             -1);
+         if (g_strcmp0 (id, priv->last_selected_id) == 0)
+           {
+             g_free (id);
+             found = TRUE;
+             break;
+           }
+         g_free (id);
+       }
+      while (gtk_tree_model_iter_next (priv->model, &other));
+    }
+
+  if (!found)
+    {
+      other = *iter;
+      while (gtk_tree_model_iter_previous (priv->model, &other))
+       {
+         gtk_tree_model_get (priv->model, &other,
+                             GD_MAIN_COLUMN_SELECTED, &selected,
+                             -1);
+
+         if (selected)
+           {
+             found = TRUE;
+             break;
+           }
+       }
+    }
+
+  if (!found)
+    {
+      other = *iter;
+      while (gtk_tree_model_iter_next (priv->model, &other))
+       {
+         gtk_tree_model_get (priv->model, &other,
+                             GD_MAIN_COLUMN_SELECTED, &selected,
+                             -1);
+         if (selected)
+           {
+             found = TRUE;
+             break;
+           }
+       }
+    }
+
+  if (found)
+    selection_mode_do_select_range (self, iter, &other);
+  else
+    {
+      /* no other selected element found, just select the iter */
+      do_select_row (self, iter, TRUE);
+    }
+
+  g_signal_emit (self, signals[VIEW_SELECTION_CHANGED], 0);
+}
+
+static gboolean
+toggle_selection_for_path (GdMainBox *self,
+                           GtkTreePath *path,
+                           gboolean select_range)
+{
+  GdMainBoxPrivate *priv;
+  gboolean selected;
+  GtkTreeIter iter;
+  char *id;
+
+  priv = gd_main_box_get_instance_private (self);
+
+  if (priv->model == NULL)
+    return FALSE;
+
+  if (!gtk_tree_model_get_iter (priv->model, &iter, path))
+    return FALSE;
+
+  gtk_tree_model_get (priv->model, &iter,
+                      GD_MAIN_COLUMN_SELECTED, &selected,
+                      -1);
+
+  if (selected)
+    {
+      do_select_row (self, &iter, FALSE);
+    }
+  else if (!selected)
+    {
+      if (select_range)
+        selection_mode_select_range (self, &iter);
+      else
+       {
+         gtk_tree_model_get (priv->model, &iter,
+                             GD_MAIN_COLUMN_ID, &id,
+                             -1);
+         g_free (priv->last_selected_id);
+         priv->last_selected_id = id;
+
+          do_select_row (self, &iter, TRUE);
+       }
+    }
+
+  g_signal_emit (self, signals[VIEW_SELECTION_CHANGED], 0);
+
+  return FALSE;
+}
+
+static void
+gd_main_box_activate_item_for_child (GdMainBox *self, GdMainBoxChild *child)
+{
+  GdMainBoxPrivate *priv;
+  GdMainBoxDisplayable *displayable;
+  gint index;
+
+  priv = gd_main_box_get_instance_private (self);
+
+  if (priv->model == NULL)
+    return;
+
+  displayable = gd_main_box_child_get_displayable (child);
+  if (displayable == NULL)
+    return;
+
+  index = gd_main_box_child_get_index (child);
+  if (index == -1)
+    return;
+
+  g_signal_emit (self, signals[ITEM_ACTIVATED], 0, displayable, (guint) index);
+}
+
+static gboolean
+on_button_release_selection_mode (GdMainBox *self,
+                                  GdkEventButton *event,
+                                  GtkTreePath *path)
+{
+  return toggle_selection_for_path (self, path, ((event->state & GDK_SHIFT_MASK) != 0));
+}
+
+static gboolean
+on_button_release_view_mode (GdMainBox *self,
+                             GdkEventButton *event,
+                             GtkTreePath *path)
+{
+  gd_main_box_activate_item_for_child (self, child);
+  return GDK_EVENT_PROPAGATE;
+}
+
+static gboolean
+event_triggers_selection_mode (GdkEventButton *event)
+{
+  return
+    (event->button == 3) ||
+    ((event->button == 1) && (event->state & GDK_CONTROL_MASK));
+}
+
+static gboolean
+on_button_release_event (GtkWidget *view,
+                         GdkEventButton *event,
+                         gpointer user_data)
+{
+  GdMainBox *self = user_data;
+  GdMainBoxPrivate *priv;
+  GdMainBoxGeneric *generic = get_generic (self);
+  GtkTreePath *path, *start_path, *end_path, *tmp_path;
+  GtkTreeIter iter;
+  gchar *button_release_item_path;
+  gboolean selection_mode;
+  gboolean res, same_item = FALSE;
+  gboolean is_selected;
+
+  priv = gd_main_box_get_instance_private (self);
+
+  /* eat double/triple click events */
+  if (event->type != GDK_BUTTON_RELEASE)
+    return TRUE;
+
+  path = gd_main_box_generic_get_path_at_pos (generic, event->x, event->y);
+
+  if (path != NULL)
+    {
+      button_release_item_path = gtk_tree_path_to_string (path);
+      if (g_strcmp0 (priv->button_press_item_path, button_release_item_path) == 0)
+        same_item = TRUE;
+
+      g_free (button_release_item_path);
+    }
+
+  g_free (priv->button_press_item_path);
+  priv->button_press_item_path = NULL;
+
+  priv->track_motion = FALSE;
+  if (priv->rubberband_select)
+    {
+      priv->rubberband_select = FALSE;
+      gd_main_box_generic_set_rubberband_range (get_generic (self), NULL, NULL);
+      if (priv->rubberband_select_last_path)
+       {
+         if (!priv->selection_mode)
+           g_signal_emit (self, signals[SELECTION_MODE_REQUEST], 0);
+         if (!priv->selection_mode)
+           {
+             res = FALSE;
+             goto out;
+           }
+
+         start_path = gtk_tree_path_copy (priv->rubberband_select_first_path);
+         end_path = gtk_tree_path_copy (priv->rubberband_select_last_path);
+         if (gtk_tree_path_compare (start_path, end_path) > 0)
+           {
+             tmp_path = start_path;
+             start_path = end_path;
+             end_path = tmp_path;
+           }
+
+         while (gtk_tree_path_compare (start_path, end_path) <= 0)
+           {
+             if (gtk_tree_model_get_iter (priv->model,
+                                          &iter, start_path))
+               {
+                 gtk_tree_model_get (priv->model, &iter,
+                                     GD_MAIN_COLUMN_SELECTED, &is_selected,
+                                     -1);
+                  do_select_row (self, &iter, !is_selected);
+               }
+
+             gtk_tree_path_next (start_path);
+           }
+
+          g_signal_emit (self, signals[VIEW_SELECTION_CHANGED], 0);
+
+         gtk_tree_path_free (start_path);
+         gtk_tree_path_free (end_path);
+       }
+
+      g_clear_pointer (&priv->rubberband_select_first_path,
+                      gtk_tree_path_free);
+      g_clear_pointer (&priv->rubberband_select_last_path,
+                      gtk_tree_path_free);
+
+      res = TRUE;
+      goto out;
+    }
+
+  if (!same_item)
+    {
+      res = FALSE;
+      goto out;
+    }
+
+  selection_mode = priv->selection_mode;
+
+  if (!selection_mode)
+    {
+      if (event_triggers_selection_mode (event))
+        {
+          g_signal_emit (self, signals[SELECTION_MODE_REQUEST], 0);
+          if (!priv->selection_mode)
+            {
+              res = FALSE;
+              goto out;
+            }
+          selection_mode = priv->selection_mode;
+        }
+    }
+
+  if (selection_mode)
+    res = on_button_release_selection_mode (self, event, path);
+  else
+    res = on_button_release_view_mode (self, event, path);
+
+ out:
+  gtk_tree_path_free (path);
+  return res;
+}
+
+static gboolean
+on_button_press_event (GtkWidget *view,
+                       GdkEventButton *event,
+                       gpointer user_data)
+{
+  GdMainBox *self = user_data;
+  GdMainBoxPrivate *priv;
+  GdMainBoxGeneric *generic = get_generic (self);
+  GtkTreePath *path;
+  GList *selection, *l;
+  GtkTreePath *sel_path;
+  gboolean found = FALSE;
+  gboolean force_selection;
+
+  priv = gd_main_box_get_instance_private (self);
+
+  path = gd_main_box_generic_get_path_at_pos (generic, event->x, event->y);
+
+  if (path != NULL)
+    priv->button_press_item_path = gtk_tree_path_to_string (path);
+
+  force_selection = event_triggers_selection_mode (event);
+  if (!priv->selection_mode && !force_selection)
+    {
+      gtk_tree_path_free (path);
+      return FALSE;
+    }
+
+  if (path && !force_selection)
+    {
+      selection = gd_main_box_get_selection (self);
+
+      for (l = selection; l != NULL; l = l->next)
+       {
+         sel_path = l->data;
+         if (gtk_tree_path_compare (path, sel_path) == 0)
+           {
+             found = TRUE;
+             break;
+           }
+       }
+
+      if (selection != NULL)
+       g_list_free_full (selection, (GDestroyNotify) gtk_tree_path_free);
+    }
+
+  /* if we did not find the item in the selection, block
+   * drag and drop, while in selection mode
+   */
+  if (!found)
+    {
+      priv->track_motion = TRUE;
+      priv->rubberband_select = FALSE;
+      priv->rubberband_select_first_path = NULL;
+      priv->rubberband_select_last_path = NULL;
+      priv->button_down_x = event->x;
+      priv->button_down_y = event->y;
+      return TRUE;
+    }
+  else
+    return FALSE;
+}
+
+static void
+gd_main_box_view_activated (GdMainBox *self, GdMainBoxChild *child)
+{
+  GdMainBoxPrivate *priv;
+  GdkModifierType state;
+
+  priv = gd_main_box_get_instance_private (self);
+
+  gtk_get_current_event_state (&state);
+
+  if (priv->selection_mode || (state & GDK_CONTROL_MASK) != 0)
+    {
+      if (!priv->selection_mode)
+       g_signal_emit (self, signals[SELECTION_MODE_REQUEST], 0);
+      toggle_selection_for_path (self, path, ((state & GDK_SHIFT_MASK) != 0));
+    }
+  else
+    {
+      gd_main_box_activate_item_for_child (self, child);
+    }
+}
+
+static void
+gd_main_box_view_child_activated_cb (GdMainBox *self, GtkFlowBoxChild *child)
+{
+  gd_main_box_view_activated (self, GD_MAIN_BOX_CHILD (child));
+}
+
+static void
+on_view_selection_changed (GtkWidget *view,
+                           gpointer user_data)
+{
+  GdMainBox *self = user_data;
+
+  g_signal_emit (self, signals[VIEW_SELECTION_CHANGED], 0);
+}
+
+static void
+gd_main_box_model_items_changed_cb (GdMainBox *self, guint position, guint removed, guint added)
+{
+  GdMainBox *self = user_data;
+
+  if (removed == 0)
+    return;
+
+  g_signal_emit (self, signals[VIEW_SELECTION_CHANGED], 0);
+}
+
+static void
+gd_main_box_apply_selection_mode (GdMainBox *self)
+{
+  GdMainBoxPrivate *priv;
+  GdMainBoxGeneric *generic = get_generic (self);
+
+  priv = gd_main_box_get_instance_private (self);
+
+  gd_main_box_generic_set_selection_mode (generic, priv->selection_mode);
+
+  if (!priv->selection_mode && priv->model != NULL)
+    gd_main_box_unselect_all (self);
+}
+
+static void
+gd_main_box_rebuild (GdMainBox *self)
+{
+  GdMainBoxPrivate *priv;
+  GtkStyleContext *context;
+
+  priv = gd_main_box_get_instance_private (self);
+
+  if (priv->current_view != NULL)
+    gtk_widget_destroy (priv->current_view);
+
+  switch (priv->current_type)
+    {
+    case GD_MAIN_BOX_ICON:
+      priv->current_view = gd_main_icon_box_new ();
+      g_signal_connect_swapped (priv->current_view,
+                                "child-activated",
+                                G_CALLBACK (gd_main_box_view_child_activated_cb),
+                                self);
+      break;
+
+    case GD_MAIN_BOX_LIST:
+    default:
+      g_assert_not_reached ();
+      break;
+    }
+
+  context = gtk_widget_get_style_context (priv->current_view);
+  gtk_style_context_add_class (context, "content-view");
+
+  gtk_container_add (GTK_CONTAINER (self), priv->current_view);
+
+  g_signal_connect (priv->current_view, "button-press-event",
+                    G_CALLBACK (on_button_press_event), self);
+  g_signal_connect (priv->current_view, "button-release-event",
+                    G_CALLBACK (on_button_release_event), self);
+  g_signal_connect (priv->current_view, "view-selection-changed",
+                    G_CALLBACK (on_view_selection_changed), self);
+
+  gd_main_box_generic_set_model (GD_MAIN_BOX_GENERIC (priv->current_view), priv->model);
+  gd_main_box_apply_selection_mode (self);
+
+  gtk_widget_show_all (GTK_WIDGET (self));
+}
+
+GdMainBox *
+gd_main_box_new (GdMainBoxType type)
+{
+  return g_object_new (GD_TYPE_MAIN_BOX, "box-type", type, NULL);
+}
+
+GdMainBoxType
+gd_main_box_get_box_type (GdMainBox *self)
+{
+  GdMainBoxPrivate *priv;
+
+  priv = gd_main_box_get_instance_private (self);
+  return priv->current_type;
+}
+
+void
+gd_main_box_set_box_type (GdMainBox *self, GdMainBoxType type)
+{
+  GdMainBoxPrivate *priv;
+
+  priv = gd_main_box_get_instance_private (self);
+
+  if (type == priv->current_type)
+    return;
+
+  priv->current_type = type;
+  gd_main_box_rebuild (self);
+  g_object_notify_by_pspec (G_OBJECT (self), properties[PROP_BOX_TYPE]);
+}
+
+gboolean
+gd_main_box_get_selection_mode (GdMainBox *self)
+{
+  GdMainBoxPrivate *priv;
+
+  priv = gd_main_box_get_instance_private (self);
+  return priv->selection_mode;
+}
+
+void
+gd_main_box_set_selection_mode (GdMainBox *self, gboolean selection_mode)
+{
+  GdMainBoxPrivate *priv;
+
+  priv = gd_main_box_get_instance_private (self);
+
+  if (selection_mode == priv->selection_mode)
+    return;
+
+  priv->selection_mode = selection_mode;
+  gd_main_box_apply_selection_mode (self);
+  g_object_notify_by_pspec (G_OBJECT (self), properties[PROP_SELECTION_MODE]);
+}
+
+/**
+ * gd_main_box_get_model:
+ * @self:
+ *
+ * Returns: (transfer none):
+ */
+GListModel *
+gd_main_box_get_model (GdMainBox *self)
+{
+  GdMainBoxPrivate *priv;
+
+  priv = gd_main_box_get_instance_private (self);
+  return priv->model;
+}
+
+/**
+ * gd_main_box_set_model:
+ * @self:
+ * @model: (allow-none):
+ *
+ */
+void
+gd_main_box_set_model (GdMainBox *self, GListModel *model)
+{
+  GdMainBoxPrivate *priv;
+
+  priv = gd_main_box_get_instance_private (self);
+
+  if (model == priv->model)
+    return;
+
+  if (priv->model)
+    g_signal_handlers_disconnect_by_func (priv->model, gd_main_box_model_items_changed_cb, self);
+
+  g_clear_object (&priv->model);
+
+  if (model != NULL)
+    {
+      priv->model = g_object_ref (model);
+      g_signal_connect_object (priv->model,
+                               "items-changed",
+                               G_CALLBACK (gd_main_box_model_items_changed_cb),
+                               self,
+                               G_CONNECT_SWAPPED);
+    }
+
+  gd_main_box_generic_set_model (GD_MAIN_BOX_GENERIC (priv->current_view), priv->model);
+  g_object_notify_by_pspec (G_OBJECT (self), properties[PROP_MODEL]);
+}
+
+/**
+ * gd_main_box_get_generic_view:
+ * @self:
+ *
+ * Returns: (transfer none):
+ */
+GtkWidget *
+gd_main_box_get_generic_view (GdMainBox *self)
+{
+  GdMainBoxPrivate *priv;
+
+  priv = gd_main_box_get_instance_private (self);
+  return priv->current_view;
+}
+
+static gboolean
+build_selection_list_foreach (GtkTreeModel *model,
+                              GtkTreePath *path,
+                              GtkTreeIter *iter,
+                              gpointer user_data)
+{
+  GList **sel = user_data;
+  gboolean is_selected;
+
+  gtk_tree_model_get (model, iter,
+                      GD_MAIN_COLUMN_SELECTED, &is_selected,
+                      -1);
+
+  if (is_selected)
+    *sel = g_list_prepend (*sel, gtk_tree_path_copy (path));
+
+  return FALSE;
+}
+
+/**
+ * gd_main_box_get_selection:
+ * @self:
+ *
+ * Returns: (element-type GtkTreePath) (transfer full):
+ */
+GList *
+gd_main_box_get_selection (GdMainBox *self)
+{
+  GdMainBoxPrivate *priv;
+  GList *retval = NULL;
+
+  priv = gd_main_box_get_instance_private (self);
+
+  gtk_tree_model_foreach (priv->model,
+                          build_selection_list_foreach,
+                          &retval);
+
+  return g_list_reverse (retval);
+}
+
+void
+gd_main_box_select_all (GdMainBox *self)
+{
+  GdMainBoxGeneric *generic = get_generic (self);
+
+  gd_main_box_generic_select_all (generic);
+}
+
+void
+gd_main_box_unselect_all (GdMainBox *self)
+{
+  GdMainBoxGeneric *generic = get_generic (self);
+
+  gd_main_box_generic_unselect_all (generic);
+}
diff --git a/libgd/gd-main-box.h b/libgd/gd-main-box.h
new file mode 100644
index 0000000..4933530
--- /dev/null
+++ b/libgd/gd-main-box.h
@@ -0,0 +1,64 @@
+/*
+ * Copyright (c) 2016 Red Hat, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser 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 Lesser General Public 
+ * License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License 
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * Author: Debarshi Ray <debarshir gnome org>
+ *
+ */
+
+#ifndef __GD_MAIN_BOX_H__
+#define __GD_MAIN_BOX_H__
+
+#include <gio/gio.h>
+
+#include <gtk/gtk.h>
+
+G_BEGIN_DECLS
+
+#define GD_TYPE_MAIN_BOX gd_main_box_get_type()
+G_DECLARE_DERIVABLE_TYPE (GdMainBox, gd_main_box, GD, MAIN_BOX, GtkScrolledWindow)
+
+typedef enum
+{
+  GD_MAIN_BOX_ICON,
+  GD_MAIN_BOX_LIST
+} GdMainBoxType;
+
+struct _GdMainBoxClass
+{
+  GtkScrolledWindowClass parent_class;
+};
+
+GtkWidget      * gd_main_box_new           (GdMainBoxType type);
+GdMainBoxType    gd_main_box_get_box_type  (GdMainBox *self);
+void             gd_main_box_set_box_type  (GdMainBox *self, GdMainBoxType type);
+
+gboolean  gd_main_box_get_selection_mode  (GdMainBox *self);
+void      gd_main_box_set_selection_mode  (GdMainBox *self, gboolean selection_mode);
+
+GList  * gd_main_box_get_selection  (GdMainBox *self);
+
+void  gd_main_box_select_all    (GdMainBox *self);
+void  gd_main_box_unselect_all  (GdMainBox *self);
+
+GListModel * gd_main_box_get_model (GdMainBox *self);
+void  gd_main_box_set_model (GdMainBox *self, GListModel *model);
+
+GtkWidget  * gd_main_box_get_generic_box  (GdMainBox *self);
+
+G_END_DECLS
+
+#endif /* __GD_MAIN_BOX_H__ */


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