[gnome-builder/wip/gtk4-port: 126/736] libide/gtk: add IdeProgressIcon

[Christian Hergert <chergert src gnome org>]

commit 9a0be1dc369314b6e75306c331ebbeefed83dd3d
Author: Christian Hergert <chergert redhat com>
Date:   Mon Mar 28 16:05:41 2022 -0700

    libide/gtk: add IdeProgressIcon
    
    This is coming over from libdazzle so we can use it in our notifications
    button widget.

 src/libide/gtk/ide-progress-icon.c | 195 +++++++++++++++++++++++++++++++++++++
 src/libide/gtk/ide-progress-icon.h |  44 +++++++++
 src/libide/gtk/libide-gtk.h        |   1 +
 src/libide/gtk/meson.build         |   2 +
 4 files changed, 242 insertions(+)
---
diff --git a/src/libide/gtk/ide-progress-icon.c b/src/libide/gtk/ide-progress-icon.c
new file mode 100644
index 000000000..55b67a785
--- /dev/null
+++ b/src/libide/gtk/ide-progress-icon.c
@@ -0,0 +1,195 @@
+/* ide-progress-icon.c
+ *
+ * Copyright (C) 2015 Igalia S.L.
+ * Copyright (C) 2016-2017 Christian Hergert <chergert redhat com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 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 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/>.
+ */
+
+#define G_LOG_DOMAIN "ide-progress-icon"
+
+#include "config.h"
+
+#define _USE_MATH_DEFINES
+#include <math.h>
+
+#include "ide-progress-icon.h"
+
+struct _IdeProgressIcon
+{
+  GtkDrawingArea parent_instance;
+  gdouble        progress;
+};
+
+G_DEFINE_TYPE (IdeProgressIcon, ide_progress_icon, GTK_TYPE_DRAWING_AREA)
+
+enum {
+  PROP_0,
+  PROP_PROGRESS,
+  N_PROPS
+};
+
+static GParamSpec *properties [N_PROPS];
+
+static void
+ide_progress_icon_draw (GtkDrawingArea *area,
+                        cairo_t        *cr,
+                        int             width,
+                        int             height,
+                        gpointer        user_data)
+{
+  IdeProgressIcon *self = (IdeProgressIcon *)area;
+  GtkStyleContext *style_context;
+  GdkRGBA rgba;
+  gdouble alpha;
+
+  g_assert (IDE_IS_PROGRESS_ICON (self));
+  g_assert (cr != NULL);
+
+  style_context = gtk_widget_get_style_context (GTK_WIDGET (area));
+  gtk_style_context_get_color (style_context, &rgba);
+
+  alpha = rgba.alpha;
+  rgba.alpha = 0.15;
+  gdk_cairo_set_source_rgba (cr, &rgba);
+
+  cairo_arc (cr,
+             width / 2,
+             height / 2,
+             width / 2,
+             0.0,
+             2 * M_PI);
+  cairo_fill (cr);
+
+  if (self->progress > 0.0)
+    {
+      rgba.alpha = alpha;
+      gdk_cairo_set_source_rgba (cr, &rgba);
+
+      cairo_arc (cr,
+                 width / 2,
+                 height / 2,
+                 width / 2,
+                 (-.5 * M_PI),
+                 (2 * self->progress * M_PI) - (.5 * M_PI));
+
+      if (self->progress != 1.0)
+        {
+          cairo_line_to (cr, width / 2, height / 2);
+          cairo_line_to (cr, width / 2, 0);
+        }
+
+      cairo_fill (cr);
+    }
+}
+
+static void
+ide_progress_icon_get_property (GObject    *object,
+                                guint       prop_id,
+                                GValue     *value,
+                                GParamSpec *pspec)
+{
+  IdeProgressIcon *self = IDE_PROGRESS_ICON (object);
+
+  switch (prop_id)
+    {
+    case PROP_PROGRESS:
+      g_value_set_double (value, ide_progress_icon_get_progress (self));
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+    }
+}
+
+static void
+ide_progress_icon_set_property (GObject      *object,
+                                guint         prop_id,
+                                const GValue *value,
+                                GParamSpec   *pspec)
+{
+  IdeProgressIcon *self = IDE_PROGRESS_ICON (object);
+
+  switch (prop_id)
+    {
+    case PROP_PROGRESS:
+      ide_progress_icon_set_progress (self, g_value_get_double (value));
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+    }
+}
+
+static void
+ide_progress_icon_class_init (IdeProgressIconClass *klass)
+{
+  GObjectClass *object_class = G_OBJECT_CLASS (klass);
+
+  object_class->get_property = ide_progress_icon_get_property;
+  object_class->set_property = ide_progress_icon_set_property;
+
+  properties [PROP_PROGRESS] =
+    g_param_spec_double ("progress",
+                         "Progress",
+                         "Progress",
+                         0.0,
+                         1.0,
+                         0.0,
+                         (G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
+
+  g_object_class_install_properties (object_class, N_PROPS, properties);
+}
+
+static void
+ide_progress_icon_init (IdeProgressIcon *icon)
+{
+  g_object_set (icon, "width-request", 16, "height-request", 16, NULL);
+  gtk_widget_set_valign (GTK_WIDGET (icon), GTK_ALIGN_CENTER);
+  gtk_widget_set_halign (GTK_WIDGET (icon), GTK_ALIGN_CENTER);
+
+  gtk_drawing_area_set_draw_func (GTK_DRAWING_AREA (icon),
+                                  ide_progress_icon_draw,
+                                  NULL, NULL);
+}
+
+GtkWidget *
+ide_progress_icon_new (void)
+{
+  return g_object_new (IDE_TYPE_PROGRESS_ICON, NULL);
+}
+
+gdouble
+ide_progress_icon_get_progress (IdeProgressIcon *self)
+{
+  g_return_val_if_fail (IDE_IS_PROGRESS_ICON (self), 0.0);
+
+  return self->progress;
+}
+
+void
+ide_progress_icon_set_progress (IdeProgressIcon *self,
+                                gdouble          progress)
+{
+  g_return_if_fail (IDE_IS_PROGRESS_ICON (self));
+
+  progress = CLAMP (progress, 0.0, 1.0);
+
+  if (self->progress != progress)
+    {
+      self->progress = progress;
+      g_object_notify_by_pspec (G_OBJECT (self), properties [PROP_PROGRESS]);
+      gtk_widget_queue_draw (GTK_WIDGET (self));
+    }
+}
diff --git a/src/libide/gtk/ide-progress-icon.h b/src/libide/gtk/ide-progress-icon.h
new file mode 100644
index 000000000..078685483
--- /dev/null
+++ b/src/libide/gtk/ide-progress-icon.h
@@ -0,0 +1,44 @@
+/* ide-progress-icon.h
+ *
+ * Copyright (C) 2016 Christian Hergert <chergert redhat com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 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 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
+
+#if !defined (IDE_GTK_INSIDE) && !defined (IDE_GTK_COMPILATION)
+# error "Only <libide-gtk.h> can be included directly."
+#endif
+
+#include <gtk/gtk.h>
+
+#include <libide-core.h>
+
+G_BEGIN_DECLS
+
+#define IDE_TYPE_PROGRESS_ICON (ide_progress_icon_get_type())
+
+IDE_AVAILABLE_IN_ALL
+G_DECLARE_FINAL_TYPE (IdeProgressIcon, ide_progress_icon, IDE, PROGRESS_ICON, GtkDrawingArea)
+
+IDE_AVAILABLE_IN_ALL
+GtkWidget *ide_progress_icon_new          (void);
+IDE_AVAILABLE_IN_ALL
+gdouble    ide_progress_icon_get_progress (IdeProgressIcon *self);
+IDE_AVAILABLE_IN_ALL
+void       ide_progress_icon_set_progress (IdeProgressIcon *self,
+                                           gdouble          progress);
+
+G_END_DECLS
diff --git a/src/libide/gtk/libide-gtk.h b/src/libide/gtk/libide-gtk.h
index f61b96c1c..82a4424d6 100644
--- a/src/libide/gtk/libide-gtk.h
+++ b/src/libide/gtk/libide-gtk.h
@@ -27,5 +27,6 @@
 # include "ide-fancy-tree-view.h"
 # include "ide-gtk-enums.h"
 # include "ide-menu-manager.h"
+# include "ide-progress-icon.h"
 # include "ide-search-entry.h"
 #undef IDE_GTK_INSIDE
diff --git a/src/libide/gtk/meson.build b/src/libide/gtk/meson.build
index 0e5cc3e51..785563362 100644
--- a/src/libide/gtk/meson.build
+++ b/src/libide/gtk/meson.build
@@ -13,6 +13,7 @@ libide_gtk_public_headers = [
   'ide-fancy-tree-view.h',
   'ide-gtk.h',
   'ide-menu-manager.h',
+  'ide-progress-icon.h',
   'ide-search-entry.h',
   'libide-gtk.h',
 ]
@@ -34,6 +35,7 @@ libide_gtk_public_sources = [
   'ide-fancy-tree-view.c',
   'ide-gtk.c',
   'ide-menu-manager.c',
+  'ide-progress-icon.c',
   'ide-search-entry.c',
 ]