1 files changed, 81 insertions, 0 deletions
diff --git a/src/display/control/canvas-temporary-item.cpp b/src/display/control/canvas-temporary-item.cpp
new file mode 100644
index 0000000..08a8607
--- /dev/null
+++ b/src/display/control/canvas-temporary-item.cpp
@@ -0,0 +1,81 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Provides a class that can contain active TemporaryItem's on a desktop
+ * When the object is deleted, it also deletes the canvasitem it contains!
+ * This object should be created/managed by a TemporaryItemList.
+ * After its lifetime, it fires the timeout signal, afterwards *it deletes itself*.
+ *
+ * (part of code inspired by message-stack.cpp)
+ *
+ * Authors:
+ *   Johan Engelen
+ *
+ * Copyright (C) Johan Engelen 2008 <j.b.c.engelen@utwente.nl>
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include <glib.h>
+
+#include "canvas-temporary-item.h"
+
+#include "canvas-item.h"
+
+namespace Inkscape {
+namespace Display {
+
+/** lifetime is measured in milliseconds
+ */
+TemporaryItem::TemporaryItem(CanvasItem *item, guint lifetime, bool deselect_destroy)
+    : canvasitem(item),
+      timeout_id(0),
+      destroy_on_deselect(deselect_destroy)
+{
+    if (lifetime > 0 && destroy_on_deselect) {
+        g_print ("Warning: lifetime should be 0 when destroy_on_deselect is true\n");
+        lifetime = 0;
+    }
+    // zero lifetime means stay forever, so do not add timeout event.
+    if (lifetime > 0) {
+        timeout_id = g_timeout_add(lifetime, &TemporaryItem::_timeout, this);
+    }
+}
+
+TemporaryItem::~TemporaryItem()
+{
+    // when it has not expired yet...
+    if (timeout_id) {
+        g_source_remove(timeout_id);
+        timeout_id = 0;
+    }
+
+    if (canvasitem) {
+        // destroying the item automatically hides it
+        delete canvasitem;
+        canvasitem = nullptr;
+    }
+}
+
+/* static method */
+int TemporaryItem::_timeout(void* data) {
+    TemporaryItem *tempitem = static_cast<TemporaryItem *>(data);
+    tempitem->timeout_id = 0;
+    tempitem->signal_timeout.emit(tempitem);
+    delete tempitem;
+    return FALSE;
+}
+
+
+} //namespace Display
+} /* 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 :