diff options
author | Kjell Ahlstedt <kjell.ahlstedt@bredband.net> | 2016-04-27 09:26:33 +0200 |
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committer | Kjell Ahlstedt <kjell.ahlstedt@bredband.net> | 2016-04-27 09:26:33 +0200 |
commit | 84e597dd50d513ee24235bdfe0ffc79d1a26ea67 (patch) | |
tree | 7389a6508f1ad3574da7bb92df2abdf979e186a6 | |
parent | a2a5d46d23e3a63262acdcc8c8ba0d23184d62a7 (diff) | |
download | glibmm-84e597dd50d513ee24235bdfe0ffc79d1a26ea67.tar.gz |
Add Gio::ListModel, ListStoreBase and ListStore<>
Based on work by Murray Cumming <murrayc@murrayc.com>
and Marcin Kolny <marcin.kolny@gmail.com>
Bug #755307
-rw-r--r-- | gio/giomm.h | 2 | ||||
-rw-r--r-- | gio/src/filelist.am | 2 | ||||
-rw-r--r-- | gio/src/gio_vfuncs.defs | 19 | ||||
-rw-r--r-- | gio/src/listmodel.ccg | 23 | ||||
-rw-r--r-- | gio/src/listmodel.hg | 102 | ||||
-rw-r--r-- | gio/src/liststore.ccg | 53 | ||||
-rw-r--r-- | gio/src/liststore.hg | 323 |
7 files changed, 524 insertions, 0 deletions
diff --git a/gio/giomm.h b/gio/giomm.h index 6e64e8ce..ad17170f 100644 --- a/gio/giomm.h +++ b/gio/giomm.h @@ -89,6 +89,8 @@ #include <giomm/initable.h> #include <giomm/inputstream.h> #include <giomm/iostream.h> +#include <giomm/listmodel.h> +#include <giomm/liststore.h> #include <giomm/loadableicon.h> #include <giomm/memoryinputstream.h> #include <giomm/memoryoutputstream.h> diff --git a/gio/src/filelist.am b/gio/src/filelist.am index 0f494e48..0095128e 100644 --- a/gio/src/filelist.am +++ b/gio/src/filelist.am @@ -74,6 +74,8 @@ giomm_files_any_hg = \ initable.hg \ inputstream.hg \ iostream.hg \ + listmodel.hg \ + liststore.hg \ loadableicon.hg \ memoryinputstream.hg \ memoryoutputstream.hg \ diff --git a/gio/src/gio_vfuncs.defs b/gio/src/gio_vfuncs.defs index e9792a97..80261738 100644 --- a/gio/src/gio_vfuncs.defs +++ b/gio/src/gio_vfuncs.defs @@ -1184,3 +1184,22 @@ '("GError**" "error") ) ) + +; GListModel +(define-vfunc get_item_type + (of-object "GListModel") + (return-type "GType") +) + +(define-vfunc get_n_items + (of-object "GListModel") + (return-type "guint") +) + +(define-vfunc get_item + (of-object "GListModel") + (return-type "gpointer") + (parameters + '("guint" "position") + ) +) diff --git a/gio/src/listmodel.ccg b/gio/src/listmodel.ccg new file mode 100644 index 00000000..b6004fab --- /dev/null +++ b/gio/src/listmodel.ccg @@ -0,0 +1,23 @@ +/* Copyright (C) 2016 The giomm Development Team + * + * This library 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 2.1 of the License, or (at your option) any later version. + * + * This library 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 library; if not, write to the Free + * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + */ + +#include <gio/gio.h> + +namespace Gio +{ + +} // namespace Gio diff --git a/gio/src/listmodel.hg b/gio/src/listmodel.hg new file mode 100644 index 00000000..3f8cec01 --- /dev/null +++ b/gio/src/listmodel.hg @@ -0,0 +1,102 @@ +/* Copyright (C) 2016 The giomm Development Team + * + * This library 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 2.1 of the License, or (at your option) any later version. + * + * This library 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 library; if not, write to the Free + * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + */ + +#include <glibmm/interface.h> +#include <gio/gio.h> + +_DEFS(giomm,gio) +_PINCLUDE(glibmm/private/interface_p.h) +_PINCLUDE(gio/gio.h) + +#ifndef DOXYGEN_SHOULD_SKIP_THIS +typedef struct _GListModelInterface GListModelInterface; +#endif /* DOXYGEN_SHOULD_SKIP_THIS */ + + +namespace Gio +{ + +/** A dynamic list of objects. + * + * A ListModel represents a mutable list of + * Glib::Objects. Its main intention is as a model for various widgets in + * user interfaces, such as list views, but it can also be used as a + * convenient method of returning lists of data, with support for + * updates. + * + * Each object in the list may also report changes in itself via some + * mechanism (normally the Glib::PropertyProxy<>::signal_changed() signal + * of one or more of the object's properties). Taken together + * with the signal_items_changed() signal, this provides for a list + * that can change its membership, and in which the members can change + * their individual properties. + * + * A good example would be the list of visible wireless network access + * points, where each access point can report dynamic properties such as + * signal strength. + * + * It is important to note that the ListModel itself does not report + * changes to the individual items. It only reports changes to the list + * membership. If you want to observe changes to the objects themselves + * then you need to connect signals to the objects that you are + * interested in. + * + * All items in a ListModel are of (or derived from) the same type. + * get_item_type() returns that type. The type may be an + * interface, in which case all objects in the list must implement it. + * + * The semantics are close to that of an array: + * get_n_items() returns the number of items in the list and + * get_object() returns an item at a (0-based) position. In + * order to allow implementations to calculate the list length lazily, + * you can also iterate over items: starting from 0, repeatedly call + * get_object() until it returns nullptr. + * + * This interface is intended only to be used from a single thread. The + * thread in which it is appropriate to use it depends on the particular + * implementation, but typically it will be from the thread that owns + * the thread-default main context + * in effect at the time that the model was created. + * + * @newin{2,50} + */ +class ListModel : public Glib::Interface +{ + _CLASS_INTERFACE(ListModel, GListModel, G_LIST_MODEL, GListModelInterface) + +protected: + _WRAP_METHOD(void items_changed(guint position, guint removed, guint added), g_list_model_items_changed, newin "2,50") + +public: + _WRAP_METHOD(GType get_item_type() const, g_list_model_get_item_type, newin "2,50") + _WRAP_METHOD(guint get_n_items() const, g_list_model_get_n_items, newin "2,50") + + //g_list_model_get_item is useless as long as we have g_list_model_get_object(). + //It doesn't do anything differently. + _IGNORE(g_list_model_get_item) + + _WRAP_METHOD(Glib::RefPtr<Glib::ObjectBase> get_object(guint position), g_list_model_get_object, newin "2,50") + _WRAP_METHOD(Glib::RefPtr<const Glib::ObjectBase> get_object(guint position) const, g_list_model_get_object, constversion, newin "2,50") + + _WRAP_SIGNAL(void items_changed(guint position, guint removed, guint added), "items-changed", no_default_handler, newin "2,50") + + _WRAP_VFUNC(GType get_item_type(), "get_item_type") + _WRAP_VFUNC(guint get_n_items(), "get_n_items") + _WRAP_VFUNC(gpointer get_item(guint position), "get_item") +}; + +} // namespace Gio diff --git a/gio/src/liststore.ccg b/gio/src/liststore.ccg new file mode 100644 index 00000000..4580c5e1 --- /dev/null +++ b/gio/src/liststore.ccg @@ -0,0 +1,53 @@ +/* Copyright (C) 2016 The giomm Development Team + * + * This library 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 2.1 of the License, or (at your option) any later version. + * + * This library 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 library; if not, write to the Free + * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + */ + +#include <gio/gio.h> +#include <memory> + +namespace +{ +extern "C" +{ +int ListStoreBase_CompareDataFunc(gconstpointer a, gconstpointer b, gpointer user_data) +{ + auto slot = static_cast<Gio::ListStoreBase::SlotCompare*>(user_data); + + const Glib::RefPtr<const Glib::ObjectBase> item_a = + Glib::wrap(static_cast<Glib::Object::BaseObjectType*>(const_cast<gpointer>(a)), true); + const Glib::RefPtr<const Glib::ObjectBase> item_b = + Glib::wrap(static_cast<Glib::Object::BaseObjectType*>(const_cast<gpointer>(b)), true); + + return (*slot)(item_a, item_b); +} +} +} // anonymous namespace + +namespace Gio +{ +void ListStoreBase::splice(guint position, guint n_removals, + const std::vector<Glib::RefPtr<Glib::ObjectBase>>& additions) +{ + const std::size_t n_additions = additions.size(); + std::unique_ptr<gpointer[]> g_additions{new gpointer[n_additions]}; + for (std::size_t i = 0; i < n_additions; i++) + { + g_additions[i] = additions[i]->gobj(); + } + g_list_store_splice(gobj(), position, n_removals, g_additions.get(), n_additions); +} + +} // namespace Gio diff --git a/gio/src/liststore.hg b/gio/src/liststore.hg new file mode 100644 index 00000000..840d7397 --- /dev/null +++ b/gio/src/liststore.hg @@ -0,0 +1,323 @@ +/* Copyright (C) 2016 The giomm Development Team + * + * This library 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 2.1 of the License, or (at your option) any later version. + * + * This library 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 library; if not, write to the Free + * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + */ + +#include <glibmm/object.h> +#include <giomm/listmodel.h> +#include <vector> +#include <type_traits> + +_DEFS(giomm,gio) +_PINCLUDE(glibmm/private/object_p.h) + +namespace Gio +{ + +/** A simple implementation of Gio::ListModel that stores all items in memory. + * + * The templated subclass ListStore<> provides better compile-time type safety. + * + * It provides insertions, deletions, and lookups in logarithmic time + * with a fast path for the common case of iterating the list linearly. + * + * @newin{2,50} + */ +class ListStoreBase +: public Glib::Object, + public ListModel +{ + _CLASS_GOBJECT(ListStoreBase, GListStore, G_LIST_STORE, Glib::Object, GObject) + _IMPLEMENTS_INTERFACE(ListModel) + _STRUCT_NOT_HIDDEN + +protected: + _WRAP_CTOR(ListStoreBase(GType item_type), g_list_store_new) + +public: + _WRAP_CREATE(GType item_type) + +#m4 _CONVERSION(`const Glib::RefPtr<Glib::ObjectBase>&',`gpointer',`($3)->gobj()') + + _WRAP_METHOD(void insert(guint position, const Glib::RefPtr<Glib::ObjectBase>& item), g_list_store_insert, newin "2,50") + + /** A slot that will be called to compare two items. + * The slot should return a negative integer if the first item comes before the second, + * 0 if they are equal, or a positive integer if the first value comes after the second. + * For instance, + * @code + * int on_compare_item(const Glib::RefPtr<const Glib::ObjectBase>& item1, const Glib::RefPtr<const Glib::ObjectBase>& item2); + * @endcode + * + * @newin{2,50} + */ + using SlotCompare = sigc::slot<int, const Glib::RefPtr<const Glib::ObjectBase>&, const Glib::RefPtr<const Glib::ObjectBase>&>; + + _WRAP_METHOD(guint insert_sorted(const Glib::RefPtr<Glib::ObjectBase>& item, + const SlotCompare& slot{compare_func}), g_list_store_insert_sorted, + slot_name slot, slot_callback ListStoreBase_CompareDataFunc, no_slot_copy, newin "2,50") + + _WRAP_METHOD(void sort(const SlotCompare& slot{compare_func}), g_list_store_sort, + slot_name slot, slot_callback ListStoreBase_CompareDataFunc, no_slot_copy, newin "2,50") + + _WRAP_METHOD(void append(const Glib::RefPtr<Glib::ObjectBase>& item), g_list_store_append, newin "2,50") + _WRAP_METHOD(void remove(guint position), g_list_store_remove, newin "2,50") + _WRAP_METHOD(void remove_all(), g_list_store_remove_all, newin "2,50") + + /** Removes @a n_removals items and adds @a additions.size() items. + * @a additions must contain items of type property_item_type() or derived from it. + * Empty RefPtr is not permitted. + * + * This function is more efficient than insert() and remove(), because it only emits + * ListModel::signal_items_changed() once for the change. + * + * The parameters @a position and @a n_removals must be correct (i.e. + * @a position + @a n_removals must be less than or equal to the length of + * the list at the time this function is called). + * + * @newin{2,50} + * + * @param position The position at which to make the change. + * @param n_removals The number of items to remove. + * @param additions The items to add. + */ + void splice(guint position, guint n_removals, + const std::vector<Glib::RefPtr<Glib::ObjectBase>>& additions); + _IGNORE(g_list_store_splice) + + _WRAP_PROPERTY("item-type", GType, newin "2,50") + +}; // end class ListStoreBase + +/** A simple implementation of Gio::ListModel that stores all items in memory. + * + * It provides insertions, deletions, and lookups in logarithmic time + * with a fast path for the common case of iterating the list linearly. + * + * @newin{2,50} + * + * @tparam T_item Base class of the items in the ListStore. All items must + * be of type T_item or a type derived from T_item. + * T_item must be Glib::Object or a type derived from Glib::Object. + */ +template <typename T_item> +class ListStore : public ListStoreBase +{ + static_assert(std::is_base_of<Glib::Object, T_item>::value, + "T_item must be Glib::Object or derived from Glib::Object."); + +protected: + ListStore(); + +public: + static Glib::RefPtr<ListStore> create(); + + /** Get the item at @a position. + * If @a position is greater than or equal to the number of + * items in @a list, an empty Glib::RefPtr is returned. + * + * An empty Glib::RefPtr is never returned for an index that is less than the length + * of the list. See ListModel::get_n_items(). + * + * @newin{2,50} + * + * @param position The position of the item to fetch. + * @return The object at @a position. + */ + Glib::RefPtr<T_item> get_item(guint position); + + /** Get the item at @a position. + * If @a position is greater than or equal to the number of + * items in @a list, an empty Glib::RefPtr is returned. + * + * An empty Glib::RefPtr is never returned for an index that is less than the length + * of the list. See ListModel::get_n_items(). + * + * @newin{2,50} + * + * @param position The position of the item to fetch. + * @return The object at @a position. + */ + Glib::RefPtr<const T_item> get_item(guint position) const; + + /** Inserts @a item at @a position. + * @a item must be of type ListStoreBase::property_item_type() or derived from it. + * @a position must be smaller than the length of the list, or equal to it to append. + * + * Use splice() to insert multiple items at the same time efficiently. + * + * @newin{2,50} + * + * @param position The position at which to insert the new item. + * @param item The new item. + */ + void insert(guint position, const Glib::RefPtr<T_item>& item); + + /** A slot that will be called to compare two items. + * The slot should return a negative integer if the first item comes before the second, + * 0 if they are equal, or a positive integer if the first value comes after the second. + * For instance, + * @code + * int on_compare_item(const Glib::RefPtr<const T_item>& item1, const Glib::RefPtr<const T_item>& item2); + * @endcode + * + * @newin{2,50} + */ + using SlotCompare = sigc::slot<int, const Glib::RefPtr<const T_item>&, const Glib::RefPtr<const T_item>&>; + + /** Inserts @a item at a position to be determined by the @a slot. + * + * The list must already be sorted before calling this function or the + * result is undefined. Usually you would approach this by only ever + * inserting items by way of this function. + * + * @newin{2,50} + * + * @param item The new item. + * @param slot Pairwise comparison function for sorting. + * @return The position at which @a item was inserted. + */ + guint insert_sorted(const Glib::RefPtr<T_item>& item, const SlotCompare& slot); + + /** Sorts the items according to @a slot. + * + * @newin{2,50} + * + * @param slot Pairwise comparison function for sorting. + */ + void sort(const SlotCompare& slot); + + /** Appends @a item. + * @a item must be of type ListStoreBase::property_item_type() or derived from it. + * + * Use splice() to append multiple items at the same time efficiently. + * + * @newin{2,50} + * + * @param item The new item. + */ + void append(const Glib::RefPtr<T_item>& item); + + /** Removes @a n_removals items and adds @a additions.size() items. + * @a additions must contain items of type ListStoreBase::property_item_type() + * or derived from it. Empty RefPtr is not permitted. + * + * This function is more efficient than insert() and remove(), because it only emits + * ListModel::signal_items_changed() once for the change. + * + * The parameters @a position and @a n_removals must be correct (i.e. + * @a position + @a n_removals must be less than or equal to the length of + * the list at the time this function is called). + * + * @newin{2,50} + * + * @param position The position at which to make the change. + * @param n_removals The number of items to remove. + * @param additions The items to add. + */ + void splice(guint position, guint n_removals, + const std::vector<Glib::RefPtr<T_item>>& additions); + +private: + static int compare_data_func(gconstpointer a, gconstpointer b, gpointer user_data); +}; // end class ListStore + +#ifndef DOXYGEN_SHOULD_SKIP_THIS + +template <typename T_item> +ListStore<T_item>::ListStore() +: ListStoreBase(T_item::get_base_type()) +{ } + +template <typename T_item> +Glib::RefPtr<ListStore<T_item>> ListStore<T_item>::create() +{ + return Glib::RefPtr<ListStore<T_item>>(new ListStore<T_item>()); +} + +template <typename T_item> +Glib::RefPtr<T_item> ListStore<T_item>::get_item(guint position) +{ + return Glib::RefPtr<T_item>::cast_dynamic(ListModel::get_object(position)); +} + +template <typename T_item> +Glib::RefPtr<const T_item> ListStore<T_item>::get_item(guint position) const +{ + return const_cast<ListStore<T_item>*>(this)->get_item(position); +} + +template <typename T_item> +void ListStore<T_item>::insert(guint position, const Glib::RefPtr<T_item>& item) +{ + ListStoreBase::insert(position, item); +} + +template <typename T_item> +guint ListStore<T_item>::insert_sorted( + const Glib::RefPtr<T_item>& item, const SlotCompare& slot) +{ + // Use the original slot (not a copy). + auto slot_copy = const_cast<SlotCompare*>(&slot); + + return g_list_store_insert_sorted(gobj(), item->gobj(), &compare_data_func, slot_copy); +} + +template <typename T_item> +void ListStore<T_item>::sort(const SlotCompare& slot) +{ + // Use the original slot (not a copy). + auto slot_copy = const_cast<SlotCompare*>(&slot); + + g_list_store_sort(gobj(), &compare_data_func, slot_copy); +} + +template <typename T_item> +void ListStore<T_item>::append(const Glib::RefPtr<T_item>& item) +{ + ListStoreBase::append(item); +} + +template <typename T_item> +void ListStore<T_item>::splice(guint position, guint n_removals, + const std::vector<Glib::RefPtr<T_item>>& additions) +{ + const std::size_t n_additions = additions.size(); + std::unique_ptr<gpointer[]> g_additions{new gpointer[n_additions]}; + for (std::size_t i = 0; i < n_additions; i++) + { + g_additions[i] = additions[i]->gobj(); + } + g_list_store_splice(gobj(), position, n_removals, g_additions.get(), n_additions); +} + +template <typename T_item> +int ListStore<T_item>::compare_data_func(gconstpointer a, gconstpointer b, gpointer user_data) +{ + auto slot = static_cast<SlotCompare*>(user_data); + + // cast_dynamic is necessary if T_item is a user-derived class, such as + // class MyObject : public Glib::Object + const Glib::RefPtr<const T_item> item_a = Glib::RefPtr<T_item>::cast_dynamic( + Glib::wrap(static_cast<typename T_item::BaseObjectType*>(const_cast<gpointer>(a)), true)); + const Glib::RefPtr<const T_item> item_b = Glib::RefPtr<T_item>::cast_dynamic( + Glib::wrap(static_cast<typename T_item::BaseObjectType*>(const_cast<gpointer>(b)), true)); + + return (*slot)(item_a, item_b); +} + +#endif // DOXYGEN_SHOULD_SKIP_THIS + +} // namespace Gio |