[gtk/gtk-3-24] Add a kwin color picker

[Matthias Clasen <matthiasc src gnome org>]

commit fc44f9755a578c349df396c8b7d8af8cdb3a1a79
Author: Matthias Clasen <mclasen redhat com>
Date:   Thu Aug 2 20:53:37 2018 -0400

    Add a kwin color picker
    
    This uses the org.kde.kwin.ColorPicker interface.

 gtk/Makefile.am                 |   2 +
 gtk/gtkcolorpickerkwin.c        | 187 ++++++++++++++++++++++++++++++++++++++++
 gtk/gtkcolorpickerkwinprivate.h |  41 +++++++++
 3 files changed, 230 insertions(+)
---
diff --git a/gtk/Makefile.am b/gtk/Makefile.am
index 2b6b55f4af..dc05ac54d8 100644
--- a/gtk/Makefile.am
+++ b/gtk/Makefile.am
@@ -399,6 +399,7 @@ gtk_private_h_sources =             \
        gtkcolorswatchprivate.h \
        gtkcoloreditorprivate.h \
        gtkcolorpickerprivate.h \
+       gtkcolorpickerkwinprivate.h     \
        gtkcolorpickerportalprivate.h   \
        gtkcolorpickershellprivate.h    \
        gtkcolorplaneprivate.h  \
@@ -679,6 +680,7 @@ gtk_base_c_sources =                \
        gtkcolorchooserdialog.c \
        gtkcoloreditor.c        \
        gtkcolorpicker.c        \
+       gtkcolorpickerkwin.c    \
        gtkcolorpickerportal.c  \
        gtkcolorpickershell.c   \
        gtkcolorplane.c         \
diff --git a/gtk/gtkcolorpickerkwin.c b/gtk/gtkcolorpickerkwin.c
new file mode 100644
index 0000000000..114d2704f2
--- /dev/null
+++ b/gtk/gtkcolorpickerkwin.c
@@ -0,0 +1,187 @@
+/* GTK - The GIMP Toolkit
+ * Copyright (C) 2018, Red Hat, Inc
+ *
+ * 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 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/>.
+ */
+
+#include "config.h"
+
+#include "gtkcolorpickerkwinprivate.h"
+#include <gio/gio.h>
+
+struct _GtkColorPickerKwin
+{
+  GObject parent_instance;
+
+  GDBusProxy *kwin_proxy;
+  GTask *task;
+};
+
+struct _GtkColorPickerKwinClass
+{
+  GObjectClass parent_class;
+};
+
+static GInitableIface *initable_parent_iface;
+static void gtk_color_picker_kwin_initable_iface_init (GInitableIface *iface);
+static void gtk_color_picker_kwin_iface_init (GtkColorPickerInterface *iface);
+
+G_DEFINE_TYPE_WITH_CODE (GtkColorPickerKwin, gtk_color_picker_kwin, G_TYPE_OBJECT,
+                         G_IMPLEMENT_INTERFACE (G_TYPE_INITABLE, gtk_color_picker_kwin_initable_iface_init)
+                         G_IMPLEMENT_INTERFACE (GTK_TYPE_COLOR_PICKER, gtk_color_picker_kwin_iface_init))
+
+static gboolean
+gtk_color_picker_kwin_initable_init (GInitable     *initable,
+                                      GCancellable  *cancellable,
+                                      GError       **error)
+{
+  GtkColorPickerKwin *picker = GTK_COLOR_PICKER_KWIN (initable);
+  char *owner;
+
+  picker->kwin_proxy = g_dbus_proxy_new_for_bus_sync (G_BUS_TYPE_SESSION,
+                                                      G_DBUS_PROXY_FLAGS_NONE,
+                                                      NULL,
+                                                      "org.kde.KWin",
+                                                      "/ColorPicker",
+                                                      "org.kde.kwin.ColorPicker",
+                                                      NULL,
+                                                      error);
+
+  if (picker->kwin_proxy == NULL)
+    {
+      g_debug ("Failed to create kwin colorpicker proxy");
+      return FALSE;
+    }
+
+  owner = g_dbus_proxy_get_name_owner (picker->kwin_proxy);
+  if (owner == NULL)
+    {
+      g_debug ("org.kde.kwin.ColorPicker not provided");
+      g_clear_object (&picker->kwin_proxy);
+      return FALSE;
+    }
+  g_free (owner);
+
+  return TRUE;
+}
+
+static void
+gtk_color_picker_kwin_initable_iface_init (GInitableIface *iface)
+{
+  initable_parent_iface = g_type_interface_peek_parent (iface);
+  iface->init = gtk_color_picker_kwin_initable_init;
+}
+
+static void
+gtk_color_picker_kwin_init (GtkColorPickerKwin *picker)
+{
+}
+
+static void
+gtk_color_picker_kwin_finalize (GObject *object)
+{
+  GtkColorPickerKwin *picker = GTK_COLOR_PICKER_KWIN (object);
+
+  g_clear_object (&picker->kwin_proxy);
+
+  G_OBJECT_CLASS (gtk_color_picker_kwin_parent_class)->finalize (object);
+}
+
+static void
+gtk_color_picker_kwin_class_init (GtkColorPickerKwinClass *class)
+{
+  GObjectClass *object_class = G_OBJECT_CLASS (class);
+
+  object_class->finalize = gtk_color_picker_kwin_finalize;
+}
+
+GtkColorPicker *
+gtk_color_picker_kwin_new (void)
+{
+  return GTK_COLOR_PICKER (g_initable_new (GTK_TYPE_COLOR_PICKER_KWIN, NULL, NULL, NULL));
+}
+
+static void
+color_picked (GObject      *source,
+              GAsyncResult *res,
+              gpointer      data)
+{
+  GtkColorPickerKwin *picker = GTK_COLOR_PICKER_KWIN (data);
+  GError *error = NULL;
+  GVariant *ret;
+
+  ret = g_dbus_proxy_call_finish (picker->kwin_proxy, res, &error);
+
+  if (ret == NULL)
+    {
+      g_task_return_error (picker->task, error);
+    }
+  else
+    {
+      GdkRGBA c;
+      guint32 color;
+
+      g_variant_get (ret, "(u)", &color);
+
+      c.blue  = ( color        & 0xff) / 255.0;
+      c.green = ((color >>  8) & 0xff) / 255.0; 
+      c.red   = ((color >> 16) & 0xff) / 255.0; 
+      c.alpha = ((color >> 24) & 0xff) / 255.0; 
+
+      g_task_return_pointer (picker->task, gdk_rgba_copy (&c), (GDestroyNotify)gdk_rgba_free);
+
+      g_variant_unref (ret);
+    }
+
+  g_clear_object (&picker->task);
+}
+
+static void
+gtk_color_picker_kwin_pick (GtkColorPicker      *cp,
+                            GAsyncReadyCallback  callback,
+                            gpointer             user_data)
+{
+  GtkColorPickerKwin *picker = GTK_COLOR_PICKER_KWIN (cp);
+
+  if (picker->task)
+    return;
+
+  picker->task = g_task_new (picker, NULL, callback, user_data);
+
+  g_dbus_proxy_call (picker->kwin_proxy,
+                     "pick",
+                     NULL,
+                     0,
+                     -1,
+                     NULL,
+                     color_picked,
+                     picker);
+}
+
+static GdkRGBA *
+gtk_color_picker_kwin_pick_finish (GtkColorPicker  *cp,
+                                   GAsyncResult    *res,
+                                   GError         **error)
+{
+  g_return_val_if_fail (g_task_is_valid (res, cp), NULL);
+
+  return g_task_propagate_pointer (G_TASK (res), error);
+}
+
+static void
+gtk_color_picker_kwin_iface_init (GtkColorPickerInterface *iface)
+{
+  iface->pick = gtk_color_picker_kwin_pick;
+  iface->pick_finish = gtk_color_picker_kwin_pick_finish;
+}
diff --git a/gtk/gtkcolorpickerkwinprivate.h b/gtk/gtkcolorpickerkwinprivate.h
new file mode 100644
index 0000000000..89644423f6
--- /dev/null
+++ b/gtk/gtkcolorpickerkwinprivate.h
@@ -0,0 +1,41 @@
+/*
+ * GTK - The GIMP Toolkit
+ * Copyright (C) 2018 Red Hat, Inc.
+ * All rights reserved.
+ *
+ * This Library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public License as
+ * published by the Free Software Foundation; either version 2 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
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GTK_COLOR_PICKER_KWIN_H__
+#define __GTK_COLOR_PICKER_KWIN_H__
+
+
+#if !defined (__GTK_H_INSIDE__) && !defined (GTK_COMPILATION)
+#error "Only <gtk/gtk.h> can be included directly."
+#endif
+
+#include <gtk/gtkcolorpickerprivate.h>
+
+G_BEGIN_DECLS
+
+
+#define GTK_TYPE_COLOR_PICKER_KWIN gtk_color_picker_kwin_get_type ()
+G_DECLARE_FINAL_TYPE (GtkColorPickerKwin, gtk_color_picker_kwin, GTK, COLOR_PICKER_KWIN, GObject)
+
+GDK_AVAILABLE_IN_ALL
+GtkColorPicker * gtk_color_picker_kwin_new (void);
+
+G_END_DECLS
+
+#endif  /* __GTK_COLOR_PICKER_KWIN_H__ */