3 files changed, 160 insertions, 0 deletions
diff --git a/src/ui/CMakeLists.txt b/src/ui/CMakeLists.txt
index fecb14a91..b9933bba6 100644
--- a/src/ui/CMakeLists.txt
+++ b/src/ui/CMakeLists.txt
@@ -5,6 +5,7 @@ set(ui_SRC
 	dialog-events.cpp
 	draw-anchor.cpp
 	interface.cpp
+    monitor.cpp
 	previewholder.cpp
 	selected-color.cpp
 	shape-editor.cpp
@@ -186,6 +187,7 @@ set(ui_SRC
 	event-debug.h
 	icon-names.h
 	interface.h
+    monitor.h
 	previewable.h
 	previewfillable.h
 	previewholder.h
diff --git a/src/ui/monitor.cpp b/src/ui/monitor.cpp
new file mode 100644
index 000000000..3e0c983fe
--- /dev/null
+++ b/src/ui/monitor.cpp
@@ -0,0 +1,107 @@
+/**
+ * \file
+ * \brief helper functions for retrieving monitor geometry, etc.
+ *//*
+ * Authors:
+ *   Eduard Braun <eduard.braun2@gmx.de>
+ *
+ * Copyright 2018 Authors
+ *
+ * This file is part of Inkscape.
+ *
+ * Inkscape 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 2 of the License, or
+ * (at your option) any later version.
+ *
+ * Inkscape 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 Inkscape.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#include <gdkmm/rectangle.h>
+#include <gdkmm/window.h>
+
+#if GTKMM_CHECK_VERSION(3,22,0)
+# include <gdkmm/monitor.h>
+#else
+# include <gdkmm/screen.h>
+#endif
+
+
+namespace Inkscape {
+namespace UI {
+
+/** get monitor geometry of primary monitor */
+Gdk::Rectangle get_monitor_geometry_primary() {
+    Gdk::Rectangle monitor_geometry;
+#if GTKMM_CHECK_VERSION(3,22,0)
+    auto const display = Gdk::Display::get_default();
+    auto const monitor = display->get_primary_monitor();
+
+    // Fallback to monitor number 0 if the user hasn't configured a primary monitor
+    if (!monitor) {
+        monitor = display->get_monitor(0);
+    }
+
+    monitor->get_geometry(monitor_geometry);
+#else
+    auto const default_screen = Gdk::Screen::get_default();
+    auto const monitor_number = default_screen->get_primary_monitor();
+    default_screen->get_monitor_geometry(monitor_number, monitor_geometry);
+#endif
+    return monitor_geometry;
+}
+
+/** get monitor geometry of monitor containing largest part of window */
+Gdk::Rectangle get_monitor_geometry_at_window(const Glib::RefPtr<Gdk::Window>& window) {
+    Gdk::Rectangle monitor_geometry;
+#if GTKMM_CHECK_VERSION(3,22,0)
+    auto const display = Gdk::Display::get_default();
+    auto const monitor = display->get_monitor_at_window(window);
+    monitor->get_geometry(monitor_geometry);
+#else
+    auto const default_screen = Gdk::Screen::get_default();
+    auto const monitor_number = default_screen->get_monitor_at_window(window);
+    default_screen->get_monitor_geometry(monitor_number, monitor_geometry);
+#endif
+    return monitor_geometry;
+}
+
+/** get monitor geometry of monitor at (or closest to) point on combined screen area */
+Gdk::Rectangle get_monitor_geometry_at_point(int x, int y) {
+    Gdk::Rectangle monitor_geometry;
+#if GTKMM_CHECK_VERSION(3,22,0)
+    auto const display = Gdk::Display::get_default();
+    auto const monitor = display->get_monitor_at_point(x ,y);
+    monitor->get_geometry(monitor_geometry);
+#else
+    auto const default_screen = Gdk::Screen::get_default();
+    auto const monitor_number = default_screen->get_monitor_at_point(x, y);
+    default_screen->get_monitor_geometry(monitor_number, monitor_geometry);
+#endif
+    return monitor_geometry;
+}
+
+}
+}
+
+
+/*
+  Local Variables:
+  mode:c++
+  c-file-style:"stroustrup"
+  c-file-offsets:((innamespace .0)(inline-open . 0)(case-label . +))
+  indent-tabs-mode:nil
+  fill-column:99
+  End:
+*/
+// vim:filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99:
diff --git a/src/ui/monitor.h b/src/ui/monitor.h
new file mode 100644
index 000000000..696a8ed73
--- /dev/null
+++ b/src/ui/monitor.h
@@ -0,0 +1,51 @@
+/**
+ * \file
+ * \brief helper functions for retrieving monitor geometry, etc.
+ *//*
+ * Authors:
+ *   Eduard Braun <eduard.braun2@gmx.de>
+ *
+ * Copyright 2018 Authors
+ *
+ * This file is part of Inkscape.
+ *
+ * Inkscape 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 2 of the License, or
+ * (at your option) any later version.
+ *
+ * Inkscape 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 Inkscape.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef SEEN_MONITOR_H
+#define SEEN_MONITOR_H
+
+#include <gdkmm/rectangle.h>
+#include <gdkmm/window.h>
+
+namespace Inkscape {
+namespace UI {
+    Gdk::Rectangle get_monitor_geometry_primary();
+    Gdk::Rectangle get_monitor_geometry_at_window(const Glib::RefPtr<Gdk::Window>& window);
+    Gdk::Rectangle get_monitor_geometry_at_point(int x, int y);
+}
+}
+
+#endif // SEEN_MONITOR_H
+
+/*
+  Local Variables:
+  mode:c++
+  c-file-style:"stroustrup"
+  c-file-offsets:((innamespace .0)(inline-open . 0)(case-label . +))
+  indent-tabs-mode:nil
+  fill-column:99
+  End:
+*/
+// vim:filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99: