1 files changed, 94 insertions, 0 deletions
diff --git a/src/ui/tool/modifier-tracker.cpp b/src/ui/tool/modifier-tracker.cpp
new file mode 100644
index 0000000..70c85a6
--- /dev/null
+++ b/src/ui/tool/modifier-tracker.cpp
@@ -0,0 +1,94 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/** @file
+ * Fine-grained modifier tracker for event handling.
+ */
+/* Authors:
+ *   Krzysztof Kosiński <tweenk.pl@gmail.com>
+ *
+ * Copyright (C) 2009 Authors
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include <gdk/gdk.h>
+#include <gdk/gdkkeysyms.h>
+#include "ui/tool/event-utils.h"
+#include "ui/tool/modifier-tracker.h"
+
+namespace Inkscape {
+namespace UI {
+
+ModifierTracker::ModifierTracker()
+    : _left_shift(false)
+    , _right_shift(false)
+    , _left_ctrl(false)
+    , _right_ctrl(false)
+    , _left_alt(false)
+    , _right_alt(false)
+{}
+
+bool ModifierTracker::event(GdkEvent *event)
+{
+    switch (event->type) {
+    case GDK_KEY_PRESS:
+        switch (shortcut_key(event->key)) {
+        case GDK_KEY_Shift_L:
+            _left_shift = true;
+            break;
+        case GDK_KEY_Shift_R:
+            _right_shift = true;
+            break;
+        case GDK_KEY_Control_L:
+            _left_ctrl = true;
+            break;
+        case GDK_KEY_Control_R:
+            _right_ctrl = true;
+            break;
+        case GDK_KEY_Alt_L:
+            _left_alt = true;
+            break;
+        case GDK_KEY_Alt_R:
+            _right_alt = true;
+            break;
+        }
+        break;
+    case GDK_KEY_RELEASE:
+        switch (shortcut_key(event->key)) {
+        case GDK_KEY_Shift_L:
+            _left_shift = false;
+            break;
+        case GDK_KEY_Shift_R:
+            _right_shift = false;
+            break;
+        case GDK_KEY_Control_L:
+            _left_ctrl = false;
+            break;
+        case GDK_KEY_Control_R:
+            _right_ctrl = false;
+            break;
+        case GDK_KEY_Alt_L:
+            _left_alt = false;
+            break;
+        case GDK_KEY_Alt_R:
+            _right_alt = false;
+            break;
+        }
+        break;
+    default: break;
+    }
+
+    return false;
+}
+
+} // namespace UI
+} // namespace Inkscape
+
+/*
+  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 :