[gnome-builder/wip/gtk4-port: 74/1774] core: move BindingGroup from dazzle
- From: Christian Hergert <chergert src gnome org>
- To: commits-list gnome org
- Cc:
- Subject: [gnome-builder/wip/gtk4-port: 74/1774] core: move BindingGroup from dazzle
- Date: Mon, 11 Jul 2022 22:30:55 +0000 (UTC)
commit 07ad01c0bb52815591e25151825445d4dfc40483
Author: Günther Wagner <info gunibert de>
Date: Sat Sep 25 14:06:44 2021 +0200
core: move BindingGroup from dazzle
src/libide/core/ide-binding-group.c | 639 ++++++++++++++++++++++++++++++++++++
src/libide/core/ide-binding-group.h | 57 ++++
2 files changed, 696 insertions(+)
---
diff --git a/src/libide/core/ide-binding-group.c b/src/libide/core/ide-binding-group.c
new file mode 100644
index 000000000..07d5e390f
--- /dev/null
+++ b/src/libide/core/ide-binding-group.c
@@ -0,0 +1,639 @@
+/* ide-binding-group.c
+ *
+ * Copyright (C) 2015 Christian Hergert <christian hergert me>
+ * Copyright (C) 2015 Garrett Regier <garrettregier gmail com>
+ *
+ * This file 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 file 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 General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <glib/gi18n.h>
+
+#include "ide-binding-group.h"
+
+/**
+ * SECTION:idebindinggroup
+ * @title: IdeBindingGroup
+ * @short_description: Manage a collection of #GBindings on
+ * a #GObject as a group.
+ *
+ * #IdeBindingGroup manages to simplify the process of binding
+ * many properties from a #GObject as a group. As such there is no API
+ * to unbind a property from the group.
+ *
+ * In particular, this allows you to change the source instance for the
+ * bindings. This automatically causes the unbinding of the properties
+ * from the old instance and binding to the new instance.
+ *
+ * This should not be confused with #GtkBindingGroup.
+ */
+
+struct _IdeBindingGroup
+{
+ GObject parent_instance;
+
+ GObject *source;
+ GPtrArray *lazy_bindings;
+};
+
+typedef struct
+{
+ IdeBindingGroup *group;
+ const gchar *source_property;
+ const gchar *target_property;
+ GObject *target;
+ GBinding *binding;
+ gpointer user_data;
+ GDestroyNotify user_data_destroy;
+ gpointer transform_to;
+ gpointer transform_from;
+ GBindingFlags binding_flags;
+ guint using_closures : 1;
+} LazyBinding;
+
+G_DEFINE_TYPE (IdeBindingGroup, ide_binding_group, G_TYPE_OBJECT)
+
+enum {
+ PROP_0,
+ PROP_SOURCE,
+ LAST_PROP
+};
+
+static GParamSpec *properties [LAST_PROP];
+
+/*#define DEBUG_BINDINGS 1*/
+
+#ifdef DEBUG_BINDINGS
+static gchar *
+_g_flags_to_string (GFlagsClass *flags_class,
+ guint value)
+{
+ GString *str;
+ GFlagsValue *flags_value;
+ gboolean first = TRUE;
+
+ str = g_string_new (NULL);
+
+ while ((first || value != 0) &&
+ (flags_value = g_flags_get_first_value (flags_class, value)) != NULL)
+ {
+ if (!first)
+ g_string_append (str, " | ");
+
+ g_string_append (str, flags_value->value_name);
+
+ first = FALSE;
+ value &= ~(flags_value->value);
+ }
+
+ return g_string_free (str, FALSE);
+}
+#endif
+
+static void
+ide_binding_group_connect (IdeBindingGroup *self,
+ LazyBinding *lazy_binding)
+{
+ GBinding *binding;
+
+ g_assert (IDE_IS_BINDING_GROUP (self));
+ g_assert (self->source != NULL);
+ g_assert (lazy_binding != NULL);
+ g_assert (lazy_binding->binding == NULL);
+ g_assert (lazy_binding->target != NULL);
+ g_assert (lazy_binding->target_property != NULL);
+ g_assert (lazy_binding->source_property != NULL);
+
+#ifdef DEBUG_BINDINGS
+ {
+ GFlagsClass *flags_class;
+ g_autofree gchar *flags_str = NULL;
+
+ flags_class = g_type_class_ref (G_TYPE_BINDING_FLAGS);
+ flags_str = _g_flags_to_string (flags_class,
+ lazy_binding->binding_flags);
+
+ g_print ("Binding %s(%p):%s to %s(%p):%s (flags=%s)\n",
+ G_OBJECT_TYPE_NAME (self->source),
+ self->source,
+ lazy_binding->source_property,
+ G_OBJECT_TYPE_NAME (lazy_binding->target),
+ lazy_binding->target,
+ lazy_binding->target_property,
+ flags_str);
+
+ g_type_class_unref (flags_class);
+ }
+#endif
+
+ if (!lazy_binding->using_closures)
+ {
+ binding = g_object_bind_property_full (self->source,
+ lazy_binding->source_property,
+ lazy_binding->target,
+ lazy_binding->target_property,
+ lazy_binding->binding_flags,
+ lazy_binding->transform_to,
+ lazy_binding->transform_from,
+ lazy_binding->user_data,
+ NULL);
+ }
+ else
+ {
+ binding = g_object_bind_property_with_closures (self->source,
+ lazy_binding->source_property,
+ lazy_binding->target,
+ lazy_binding->target_property,
+ lazy_binding->binding_flags,
+ lazy_binding->transform_to,
+ lazy_binding->transform_from);
+ }
+
+ lazy_binding->binding = binding;
+}
+
+static void
+ide_binding_group_disconnect (LazyBinding *lazy_binding)
+{
+ g_assert (lazy_binding != NULL);
+
+ if (lazy_binding->binding != NULL)
+ {
+ g_binding_unbind (lazy_binding->binding);
+ lazy_binding->binding = NULL;
+ }
+}
+
+static void
+ide_binding_group__source_weak_notify (gpointer data,
+ GObject *where_object_was)
+{
+ IdeBindingGroup *self = data;
+ gsize i;
+
+ g_assert (IDE_IS_BINDING_GROUP (self));
+
+ self->source = NULL;
+
+ for (i = 0; i < self->lazy_bindings->len; i++)
+ {
+ LazyBinding *lazy_binding;
+
+ lazy_binding = g_ptr_array_index (self->lazy_bindings, i);
+ lazy_binding->binding = NULL;
+ }
+}
+
+static void
+ide_binding_group__target_weak_notify (gpointer data,
+ GObject *where_object_was)
+{
+ IdeBindingGroup *self = data;
+ gsize i;
+
+ g_assert (IDE_IS_BINDING_GROUP (self));
+
+ for (i = 0; i < self->lazy_bindings->len; i++)
+ {
+ LazyBinding *lazy_binding;
+
+ lazy_binding = g_ptr_array_index (self->lazy_bindings, i);
+
+ if (lazy_binding->target == where_object_was)
+ {
+ lazy_binding->target = NULL;
+ lazy_binding->binding = NULL;
+
+ g_ptr_array_remove_index_fast (self->lazy_bindings, i);
+ break;
+ }
+ }
+}
+
+static void
+lazy_binding_free (gpointer data)
+{
+ LazyBinding *lazy_binding = data;
+
+ if (lazy_binding->target != NULL)
+ {
+ g_object_weak_unref (lazy_binding->target,
+ ide_binding_group__target_weak_notify,
+ lazy_binding->group);
+ lazy_binding->target = NULL;
+ }
+
+ ide_binding_group_disconnect (lazy_binding);
+
+ lazy_binding->group = NULL;
+ lazy_binding->source_property = NULL;
+ lazy_binding->target_property = NULL;
+
+ if (lazy_binding->user_data_destroy)
+ lazy_binding->user_data_destroy (lazy_binding->user_data);
+
+ if (lazy_binding->using_closures)
+ {
+ g_clear_pointer (&lazy_binding->transform_to, g_closure_unref);
+ g_clear_pointer (&lazy_binding->transform_from, g_closure_unref);
+ }
+
+ g_slice_free (LazyBinding, lazy_binding);
+}
+
+static void
+ide_binding_group_dispose (GObject *object)
+{
+ IdeBindingGroup *self = (IdeBindingGroup *)object;
+
+ g_assert (IDE_IS_BINDING_GROUP (self));
+
+ if (self->source != NULL)
+ {
+ g_object_weak_unref (self->source,
+ ide_binding_group__source_weak_notify,
+ self);
+ self->source = NULL;
+ }
+
+ if (self->lazy_bindings->len != 0)
+ g_ptr_array_remove_range (self->lazy_bindings, 0, self->lazy_bindings->len);
+
+ G_OBJECT_CLASS (ide_binding_group_parent_class)->dispose (object);
+}
+
+static void
+ide_binding_group_finalize (GObject *object)
+{
+ IdeBindingGroup *self = (IdeBindingGroup *)object;
+
+ g_assert (self->lazy_bindings != NULL);
+ g_assert (self->lazy_bindings->len == 0);
+
+ g_clear_pointer (&self->lazy_bindings, g_ptr_array_unref);
+
+ G_OBJECT_CLASS (ide_binding_group_parent_class)->finalize (object);
+}
+
+static void
+ide_binding_group_get_property (GObject *object,
+ guint prop_id,
+ GValue *value,
+ GParamSpec *pspec)
+{
+ IdeBindingGroup *self = IDE_BINDING_GROUP (object);
+
+ switch (prop_id)
+ {
+ case PROP_SOURCE:
+ g_value_set_object (value, ide_binding_group_get_source (self));
+ break;
+
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+ }
+}
+
+static void
+ide_binding_group_set_property (GObject *object,
+ guint prop_id,
+ const GValue *value,
+ GParamSpec *pspec)
+{
+ IdeBindingGroup *self = IDE_BINDING_GROUP (object);
+
+ switch (prop_id)
+ {
+ case PROP_SOURCE:
+ ide_binding_group_set_source (self, g_value_get_object (value));
+ break;
+
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+ }
+}
+
+static void
+ide_binding_group_class_init (IdeBindingGroupClass *klass)
+{
+ GObjectClass *object_class = G_OBJECT_CLASS (klass);
+
+ object_class->dispose = ide_binding_group_dispose;
+ object_class->finalize = ide_binding_group_finalize;
+ object_class->get_property = ide_binding_group_get_property;
+ object_class->set_property = ide_binding_group_set_property;
+
+ /**
+ * IdeBindingGroup:source
+ *
+ * The source object used for binding properties.
+ */
+ properties [PROP_SOURCE] =
+ g_param_spec_object ("source",
+ "Source",
+ "The source GObject used for binding properties.",
+ G_TYPE_OBJECT,
+ (G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
+
+ g_object_class_install_properties (object_class, LAST_PROP, properties);
+}
+
+static void
+ide_binding_group_init (IdeBindingGroup *self)
+{
+ self->lazy_bindings = g_ptr_array_new_with_free_func (lazy_binding_free);
+}
+
+/**
+ * ide_binding_group_new:
+ *
+ * Creates a new #IdeBindingGroup.
+ *
+ * Returns: a new #IdeBindingGroup
+ */
+IdeBindingGroup *
+ide_binding_group_new (void)
+{
+ return g_object_new (IDE_TYPE_BINDING_GROUP, NULL);
+}
+
+/**
+ * ide_binding_group_get_source:
+ * @self: the #IdeBindingGroup
+ *
+ * Gets the source object used for binding properties.
+ *
+ * Returns: (transfer none) (nullable): the source object.
+ */
+GObject *
+ide_binding_group_get_source (IdeBindingGroup *self)
+{
+ g_return_val_if_fail (IDE_IS_BINDING_GROUP (self), NULL);
+
+ return self->source;
+}
+
+static gboolean
+ide_binding_group_check_source (IdeBindingGroup *self,
+ gpointer source)
+{
+ gsize i;
+
+ for (i = 0; i < self->lazy_bindings->len; i++)
+ {
+ LazyBinding *lazy_binding;
+
+ lazy_binding = g_ptr_array_index (self->lazy_bindings, i);
+
+ g_return_val_if_fail (g_object_class_find_property (G_OBJECT_GET_CLASS (source),
+ lazy_binding->source_property) != NULL,
+ FALSE);
+ }
+
+ return TRUE;
+}
+
+/**
+ * ide_binding_group_set_source:
+ * @self: the #IdeBindingGroup
+ * @source: (type GObject) (nullable): the source #GObject
+ *
+ * Sets @source as the source object used for creating property
+ * bindings. If there is already a source object all bindings from it
+ * will be removed.
+ *
+ * Note: All properties that have been bound must exist on @source.
+ */
+void
+ide_binding_group_set_source (IdeBindingGroup *self,
+ gpointer source)
+{
+ g_return_if_fail (IDE_IS_BINDING_GROUP (self));
+ g_return_if_fail (!source || G_IS_OBJECT (source));
+ g_return_if_fail (source != (gpointer)self);
+
+ if (source == (gpointer)self->source)
+ return;
+
+ if (self->source != NULL)
+ {
+ gsize i;
+
+ g_object_weak_unref (self->source,
+ ide_binding_group__source_weak_notify,
+ self);
+ self->source = NULL;
+
+ for (i = 0; i < self->lazy_bindings->len; i++)
+ {
+ LazyBinding *lazy_binding;
+
+ lazy_binding = g_ptr_array_index (self->lazy_bindings, i);
+ ide_binding_group_disconnect (lazy_binding);
+ }
+ }
+
+ if (source != NULL && ide_binding_group_check_source (self, source))
+ {
+ gsize i;
+
+ self->source = source;
+ g_object_weak_ref (self->source,
+ ide_binding_group__source_weak_notify,
+ self);
+
+ for (i = 0; i < self->lazy_bindings->len; i++)
+ {
+ LazyBinding *lazy_binding;
+
+ lazy_binding = g_ptr_array_index (self->lazy_bindings, i);
+ ide_binding_group_connect (self, lazy_binding);
+ }
+ }
+
+ g_object_notify_by_pspec (G_OBJECT (self), properties [PROP_SOURCE]);
+}
+
+static void
+ide_binding_group_bind_helper (IdeBindingGroup *self,
+ const gchar *source_property,
+ gpointer target,
+ const gchar *target_property,
+ GBindingFlags flags,
+ gpointer transform_to,
+ gpointer transform_from,
+ gpointer user_data,
+ GDestroyNotify user_data_destroy,
+ gboolean using_closures)
+{
+ LazyBinding *lazy_binding;
+
+ g_return_if_fail (IDE_IS_BINDING_GROUP (self));
+ g_return_if_fail (source_property != NULL);
+ g_return_if_fail (self->source == NULL ||
+ g_object_class_find_property (G_OBJECT_GET_CLASS (self->source),
+ source_property) != NULL);
+ g_return_if_fail (G_IS_OBJECT (target));
+ g_return_if_fail (target_property != NULL);
+ g_return_if_fail (g_object_class_find_property (G_OBJECT_GET_CLASS (target),
+ target_property) != NULL);
+ g_return_if_fail (target != (gpointer)self ||
+ strcmp (source_property, target_property) != 0);
+
+ lazy_binding = g_slice_new0 (LazyBinding);
+ lazy_binding->group = self;
+ lazy_binding->source_property = g_intern_string (source_property);
+ lazy_binding->target_property = g_intern_string (target_property);
+ lazy_binding->target = target;
+ lazy_binding->binding_flags = flags | G_BINDING_SYNC_CREATE;
+ lazy_binding->user_data = user_data;
+ lazy_binding->user_data_destroy = user_data_destroy;
+ lazy_binding->transform_to = transform_to;
+ lazy_binding->transform_from = transform_from;
+
+ if (using_closures)
+ {
+ lazy_binding->using_closures = TRUE;
+
+ if (transform_to != NULL)
+ g_closure_sink (g_closure_ref (transform_to));
+
+ if (transform_from != NULL)
+ g_closure_sink (g_closure_ref (transform_from));
+ }
+
+ g_object_weak_ref (target,
+ ide_binding_group__target_weak_notify,
+ self);
+
+ g_ptr_array_add (self->lazy_bindings, lazy_binding);
+
+ if (self->source != NULL)
+ ide_binding_group_connect (self, lazy_binding);
+}
+
+/**
+ * ide_binding_group_bind:
+ * @self: the #IdeBindingGroup
+ * @source_property: the property on the source to bind
+ * @target: (type GObject): the target #GObject
+ * @target_property: the property on @target to bind
+ * @flags: the flags used to create the #GBinding
+ *
+ * Creates a binding between @source_property on the source object
+ * and @target_property on @target. Whenever the @source_property
+ * is changed the @target_property is updated using the same value.
+ * The binding flags #G_BINDING_SYNC_CREATE is automatically specified.
+ *
+ * See: g_object_bind_property().
+ */
+void
+ide_binding_group_bind (IdeBindingGroup *self,
+ const gchar *source_property,
+ gpointer target,
+ const gchar *target_property,
+ GBindingFlags flags)
+{
+ ide_binding_group_bind_full (self, source_property,
+ target, target_property,
+ flags,
+ NULL, NULL,
+ NULL, NULL);
+}
+
+/**
+ * ide_binding_group_bind_full:
+ * @self: the #IdeBindingGroup
+ * @source_property: the property on the source to bind
+ * @target: (type GObject): the target #GObject
+ * @target_property: the property on @target to bind
+ * @flags: the flags used to create the #GBinding
+ * @transform_to: (scope notified) (nullable): the transformation function
+ * from the source object to the @target, or %NULL to use the default
+ * @transform_from: (scope notified) (nullable): the transformation function
+ * from the @target to the source object, or %NULL to use the default
+ * @user_data: custom data to be passed to the transformation
+ * functions, or %NULL
+ * @user_data_destroy: function to be called when disposing the binding,
+ * to free the resources used by the transformation functions
+ *
+ * Creates a binding between @source_property on the source object and
+ * @target_property on @target, allowing you to set the transformation
+ * functions to be used by the binding. The binding flags
+ * #G_BINDING_SYNC_CREATE is automatically specified.
+ *
+ * See: g_object_bind_property_full().
+ */
+void
+ide_binding_group_bind_full (IdeBindingGroup *self,
+ const gchar *source_property,
+ gpointer target,
+ const gchar *target_property,
+ GBindingFlags flags,
+ GBindingTransformFunc transform_to,
+ GBindingTransformFunc transform_from,
+ gpointer user_data,
+ GDestroyNotify user_data_destroy)
+{
+ ide_binding_group_bind_helper (self, source_property,
+ target, target_property,
+ flags,
+ transform_to, transform_from,
+ user_data, user_data_destroy,
+ FALSE);
+}
+
+/**
+ * ide_binding_group_bind_with_closures: (rename-to ide_binding_group_bind_full)
+ * @self: the #IdeBindingGroup
+ * @source_property: the property on the source to bind
+ * @target: (type GObject): the target #GObject
+ * @target_property: the property on @target to bind
+ * @flags: the flags used to create the #GBinding
+ * @transform_to: (nullable): a #GClosure wrapping the
+ * transformation function from the source object to the @target,
+ * or %NULL to use the default
+ * @transform_from: (nullable): a #GClosure wrapping the
+ * transformation function from the @target to the source object,
+ * or %NULL to use the default
+ *
+ * Creates a binding between @source_property on the source object and
+ * @target_property on @target, allowing you to set the transformation
+ * functions to be used by the binding. The binding flags
+ * #G_BINDING_SYNC_CREATE is automatically specified.
+ *
+ * This function is the language bindings friendly version of
+ * ide_binding_group_bind_property_full(), using #GClosures
+ * instead of function pointers.
+ *
+ * See: g_object_bind_property_with_closures().
+ */
+void
+ide_binding_group_bind_with_closures (IdeBindingGroup *self,
+ const gchar *source_property,
+ gpointer target,
+ const gchar *target_property,
+ GBindingFlags flags,
+ GClosure *transform_to,
+ GClosure *transform_from)
+{
+ ide_binding_group_bind_helper (self, source_property,
+ target, target_property,
+ flags,
+ transform_to, transform_from,
+ NULL, NULL,
+ TRUE);
+}
+
diff --git a/src/libide/core/ide-binding-group.h b/src/libide/core/ide-binding-group.h
new file mode 100644
index 000000000..c085f40e9
--- /dev/null
+++ b/src/libide/core/ide-binding-group.h
@@ -0,0 +1,57 @@
+/* ide-binding-group.h
+ *
+ * Copyright (C) 2015 Christian Hergert <christian hergert me>
+ * Copyright (C) 2015 Garrett Regier <garrettregier gmail com>
+ *
+ * This file 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 file 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 General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include <gio/gio.h>
+
+G_BEGIN_DECLS
+
+#define IDE_TYPE_BINDING_GROUP (ide_binding_group_get_type())
+
+G_DECLARE_FINAL_TYPE (IdeBindingGroup, ide_binding_group, IDE, BINDING_GROUP, GObject)
+
+IdeBindingGroup *ide_binding_group_new (void);
+GObject *ide_binding_group_get_source (IdeBindingGroup *self);
+void ide_binding_group_set_source (IdeBindingGroup *self,
+ gpointer source);
+void ide_binding_group_bind (IdeBindingGroup *self,
+ const gchar *source_property,
+ gpointer target,
+ const gchar *target_property,
+ GBindingFlags flags);
+void ide_binding_group_bind_full (IdeBindingGroup *self,
+ const gchar *source_property,
+ gpointer target,
+ const gchar *target_property,
+ GBindingFlags flags,
+ GBindingTransformFunc transform_to,
+ GBindingTransformFunc transform_from,
+ gpointer user_data,
+ GDestroyNotify user_data_destroy);
+void ide_binding_group_bind_with_closures (IdeBindingGroup *self,
+ const gchar *source_property,
+ gpointer target,
+ const gchar *target_property,
+ GBindingFlags flags,
+ GClosure *transform_to,
+ GClosure *transform_from);
+
+G_END_DECLS
+
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