[gtk/wip/layout-manager: 70/75] Add GtkLayoutManager
- From: Emmanuele Bassi <ebassi src gnome org>
- To: commits-list gnome org
- Cc:
- Subject: [gtk/wip/layout-manager: 70/75] Add GtkLayoutManager
- Date: Mon, 21 Jan 2019 19:39:57 +0000 (UTC)
commit f716ca3c254ad505c9638711dbe622a72ded3ab3
Author: Emmanuele Bassi <ebassi gnome org>
Date: Wed Dec 12 15:24:41 2018 +0000
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.
gtk/gtk.h | 1 +
gtk/gtklayoutmanager.c | 222 ++++++++++++++++++++++++++++++++++++++++++
gtk/gtklayoutmanager.h | 94 ++++++++++++++++++
gtk/gtklayoutmanagerprivate.h | 10 ++
gtk/meson.build | 2 +
5 files changed, 329 insertions(+)
---
diff --git a/gtk/gtk.h b/gtk/gtk.h
index cf89eca9ab..67b101f34d 100644
--- a/gtk/gtk.h
+++ b/gtk/gtk.h
@@ -136,6 +136,7 @@
#include <gtk/gtkinvisible.h>
#include <gtk/gtklabel.h>
#include <gtk/gtklayout.h>
+#include <gtk/gtklayoutmanager.h>
#include <gtk/gtklevelbar.h>
#include <gtk/gtklinkbutton.h>
#include <gtk/gtklistbox.h>
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);
+}
diff --git a/gtk/gtklayoutmanager.h b/gtk/gtklayoutmanager.h
new file mode 100644
index 0000000000..e849e300a2
--- /dev/null
+++ b/gtk/gtklayoutmanager.h
@@ -0,0 +1,94 @@
+/* gtklayoutmanager.h: 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
+ */
+#pragma once
+
+#include <gtk/gtkcontainer.h>
+
+G_BEGIN_DECLS
+
+#define GTK_TYPE_LAYOUT_MANAGER (gtk_layout_manager_get_type ())
+
+GDK_AVAILABLE_IN_ALL
+G_DECLARE_DERIVABLE_TYPE (GtkLayoutManager, gtk_layout_manager, GTK, LAYOUT_MANAGER, GObject)
+
+/**
+ * GtkLayoutManagerClass:
+ * @get_request_mode: a virtual function, used to return the preferred
+ * request mode for the layout manager; for instance, "width for height"
+ * or "height for width"; see #GtkSizeRequestMode
+ * @measure: a virtual function, used to measure the minimum and preferred
+ * sizes of the widget using the layout manager for a given orientation
+ * @allocate: a virtual function, used to allocate the size of the widget
+ * using the layout manager
+ *
+ * The `GtkLayoutManagerClass` structure contains only private data, and
+ * should only be accessed through the provided API, or when subclassing
+ * #GtkLayoutManager.
+ */
+struct _GtkLayoutManagerClass
+{
+ /*< private >*/
+ GObjectClass parent_class;
+
+ /*< public >*/
+ GtkSizeRequestMode (* get_request_mode) (GtkLayoutManager *manager,
+ GtkWidget *widget);
+
+ void (* measure) (GtkLayoutManager *manager,
+ GtkWidget *widget,
+ GtkOrientation orientation,
+ int for_size,
+ int *minimum,
+ int *natural,
+ int *minimum_baseline,
+ int *natural_baseline);
+
+ void (* allocate) (GtkLayoutManager *manager,
+ GtkWidget *widget,
+ int width,
+ int height,
+ int baseline);
+
+ /*< private >*/
+ gpointer _padding[16];
+};
+
+GDK_AVAILABLE_IN_ALL
+void gtk_layout_manager_measure (GtkLayoutManager *manager,
+ GtkWidget *widget,
+ GtkOrientation orientation,
+ int for_size,
+ int *minimum,
+ int *natural,
+ int *minimum_baseline,
+ int *natural_baseline);
+GDK_AVAILABLE_IN_ALL
+void gtk_layout_manager_allocate (GtkLayoutManager *manager,
+ GtkWidget *widget,
+ int width,
+ int height,
+ int baseline);
+GDK_AVAILABLE_IN_ALL
+GtkSizeRequestMode gtk_layout_manager_get_request_mode (GtkLayoutManager *manager,
+ GtkWidget *widget);
+
+GDK_AVAILABLE_IN_ALL
+void gtk_layout_manager_layout_changed (GtkLayoutManager *manager);
+
+G_END_DECLS
diff --git a/gtk/gtklayoutmanagerprivate.h b/gtk/gtklayoutmanagerprivate.h
new file mode 100644
index 0000000000..d02ed56a6f
--- /dev/null
+++ b/gtk/gtklayoutmanagerprivate.h
@@ -0,0 +1,10 @@
+#pragma once
+
+#include "gtklayoutmanager.h"
+
+G_BEGIN_DECLS
+
+void gtk_layout_manager_set_widget (GtkLayoutManager *manager,
+ GtkWidget *widget);
+
+G_END_DECLS
diff --git a/gtk/meson.build b/gtk/meson.build
index cc021d7fea..b49af414be 100644
--- a/gtk/meson.build
+++ b/gtk/meson.build
@@ -263,6 +263,7 @@ gtk_public_sources = files([
'gtkinvisible.c',
'gtklabel.c',
'gtklayout.c',
+ 'gtklayoutmanager.c',
'gtklevelbar.c',
'gtklinkbutton.c',
'gtklistbox.c',
@@ -510,6 +511,7 @@ gtk_public_headers = files([
'gtkinvisible.h',
'gtklabel.h',
'gtklayout.h',
+ 'gtklayoutmanager.h',
'gtklevelbar.h',
'gtklinkbutton.h',
'gtklistbox.h',
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