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author | Emmanuele Bassi <ebassi@gnome.org> | 2018-12-12 15:24:41 +0000 |
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committer | Emmanuele Bassi <ebassi@gnome.org> | 2019-03-26 00:11:27 +0000 |
commit | 24754c32593c9a6c6cf1e2c6a57988cd7e416b5c (patch) | |
tree | a68686397ae9d55ebdd50d5e7e56a88faf0e59e4 /gtk/gtklayoutmanager.c | |
parent | 4dfe2a8aa864444027548e2019448d26b50839e5 (diff) | |
download | gtk+-24754c32593c9a6c6cf1e2c6a57988cd7e416b5c.tar.gz |
Add GtkLayoutManager
A base abstract class for layout manager delegate objects.
Layout managers are associated to a single widget, like event
controllers, and are responsible for measuring and allocating the
children of the widget they are bound to.
Diffstat (limited to 'gtk/gtklayoutmanager.c')
-rw-r--r-- | gtk/gtklayoutmanager.c | 222 |
1 files changed, 222 insertions, 0 deletions
diff --git a/gtk/gtklayoutmanager.c b/gtk/gtklayoutmanager.c new file mode 100644 index 0000000000..bb23c5a598 --- /dev/null +++ b/gtk/gtklayoutmanager.c @@ -0,0 +1,222 @@ +/* gtklayoutmanager.c: Layout manager base class + * Copyright 2018 The GNOME Foundation + * + * 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, see <http://www.gnu.org/licenses/>. + * + * Author: Emmanuele Bassi + */ + +/** + * SECTION:gtklayoutmanager + * @Title: GtkLayoutManager + * @Short_description: Base class for layout manager + * + * ... + */ + +#include "config.h" + +#include "gtklayoutmanager.h" + +#ifdef G_ENABLE_DEBUG +#define LAYOUT_MANAGER_WARN_NOT_IMPLEMENTED(m,method) G_STMT_START { \ + GObject *_obj = G_OBJECT (m); \ + g_warning ("Layout managers of type %s do not implement " \ + "the GtkLayoutManager::%s method", \ + G_OBJECT_TYPE_NAME (_obj), \ + #method); } G_STMT_END +#else +#define LAYOUT_MANAGER_WARN_NOT_IMPLEMENTED(m,method) +#endif + +typedef struct { + GtkWidget *widget; +} GtkLayoutManagerPrivate; + +G_DEFINE_ABSTRACT_TYPE_WITH_PRIVATE (GtkLayoutManager, gtk_layout_manager, G_TYPE_OBJECT) + +static GtkSizeRequestMode +gtk_layout_manager_real_get_request_mode (GtkLayoutManager *manager, + GtkWidget *widget) +{ + LAYOUT_MANAGER_WARN_NOT_IMPLEMENTED (manager, get_request_mode); + + return GTK_SIZE_REQUEST_CONSTANT_SIZE; +} + +static void +gtk_layout_manager_real_measure (GtkLayoutManager *manager, + GtkWidget *widget, + GtkOrientation orientation, + int for_size, + int *minimum, + int *natural, + int *baseline_minimum, + int *baseline_natural) +{ + LAYOUT_MANAGER_WARN_NOT_IMPLEMENTED (manager, measure); + + if (minimum != NULL) + *minimum = 0; + + if (natural != NULL) + *natural = 0; + + if (baseline_minimum != NULL) + *baseline_minimum = 0; + + if (baseline_natural != NULL) + *baseline_natural = 0; +} + +static void +gtk_layout_manager_real_allocate (GtkLayoutManager *manager, + GtkWidget *widget, + int width, + int height, + int baseline) +{ + LAYOUT_MANAGER_WARN_NOT_IMPLEMENTED (manager, allocate); +} + +static void +gtk_layout_manager_class_init (GtkLayoutManagerClass *klass) +{ + klass->get_request_mode = gtk_layout_manager_real_get_request_mode; + klass->measure = gtk_layout_manager_real_measure; + klass->allocate = gtk_layout_manager_real_allocate; +} + +static void +gtk_layout_manager_init (GtkLayoutManager *self) +{ +} + +/*< private > + * gtk_layout_manager_set_widget: + * @layout_manager: a #GtkLayoutManager + * @widget: (nullable): a #GtkWidget + * + * ... + */ +void +gtk_layout_manager_set_widget (GtkLayoutManager *layout_manager, + GtkWidget *widget) +{ + GtkLayoutManagerPrivate *priv = gtk_layout_manager_get_instance_private (layout_manager); + + priv->widget = widget; +} + +/** + * gtk_layout_manager_measure: + * @manager: + * @widget: + * @orientation: + * @for_size: + * @minimum: (out): + * @natural: (out): + * @minimum_baseline: (out): + * @natural_baseline: (out): + * + * ... + * + */ +void +gtk_layout_manager_measure (GtkLayoutManager *manager, + GtkWidget *widget, + GtkOrientation orientation, + int for_size, + int *minimum, + int *natural, + int *minimum_baseline, + int *natural_baseline) +{ + GtkLayoutManagerClass *klass; + + g_return_if_fail (GTK_IS_LAYOUT_MANAGER (manager)); + g_return_if_fail (GTK_IS_WIDGET (widget)); + + klass = GTK_LAYOUT_MANAGER_GET_CLASS (manager); + + klass->measure (manager, widget, orientation, + for_size, + minimum, natural, + minimum_baseline, natural_baseline); +} + +/** + * gtk_layout_manager_allocate: + * @manager: + * @widget: + * @width: + * @height: + * @baseline: + * + * ... + */ +void +gtk_layout_manager_allocate (GtkLayoutManager *manager, + GtkWidget *widget, + int width, + int height, + int baseline) +{ + GtkLayoutManagerClass *klass; + + g_return_if_fail (GTK_IS_LAYOUT_MANAGER (manager)); + g_return_if_fail (GTK_IS_WIDGET (widget)); + + klass = GTK_LAYOUT_MANAGER_GET_CLASS (manager); + + klass->allocate (manager, widget, width, height, baseline); +} + +/** + * gtk_layout_manager_get_request_mode: + * @manager: + * @widget: + * + * ... + * + * Returns: ... + */ +GtkSizeRequestMode +gtk_layout_manager_get_request_mode (GtkLayoutManager *manager, + GtkWidget *widget) +{ + GtkLayoutManagerClass *klass; + + g_return_val_if_fail (GTK_IS_LAYOUT_MANAGER (manager), GTK_SIZE_REQUEST_CONSTANT_SIZE); + g_return_val_if_fail (GTK_IS_WIDGET (widget), GTK_SIZE_REQUEST_CONSTANT_SIZE); + + klass = GTK_LAYOUT_MANAGER_GET_CLASS (manager); + + return klass->get_request_mode (manager, widget); +} + +/** + * gtk_layout_manager_layout_changed: + * @manager: a #GtkLayoutManager + * + * ... + */ +void +gtk_layout_manager_layout_changed (GtkLayoutManager *manager) +{ + GtkLayoutManagerPrivate *priv = gtk_layout_manager_get_instance_private (manager); + + if (priv->widget != NULL) + gtk_widget_queue_resize (priv->widget); +} |