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-rw-r--r--src/display/control/canvas-temporary-item.cpp81
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
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+++ b/src/display/control/canvas-temporary-item.cpp
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+// 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 :