[cpp] Add Qt Desginer widget plugin examples

cpp/qt/designer-plugin/widget-plugin.cpp

@@ -0,0 +1,67 @@
+/*##############################################################################
+## Author: Shaun Reed                                                         ##
+## Legal: All Content (c) 2022 Shaun Reed, all rights reserved                ##
+## About: Example Qt Designer widget plugin                                   ##
+##                                                                            ##
+## Contact: shaunrd0@gmail.com  | URL: www.shaunreed.com | GitHub: shaunrd0   ##
+################################################################################
+*/
+
+#include "widget-plugin.h"
+#include "text-view.h"
+
+#include <QtPlugin>
+
+QString WidgetPlugin::toolTip() const
+{
+    return {};
+}
+
+QString WidgetPlugin::whatsThis() const
+{
+    return {};
+}
+
+QIcon WidgetPlugin::icon() const
+{
+    return {};
+}
+
+bool WidgetPlugin::isContainer() const
+{
+    return false;
+}
+
+QString WidgetPlugin::group() const
+{
+    return m_group;
+}
+
+QString WidgetPlugin::name() const
+{
+  return QStringLiteral("KlipsWidgetPlugin");
+}
+
+QString WidgetPlugin::includeFile() const
+{
+  return QStringLiteral("widget-plugin.h");
+}
+
+QWidget *WidgetPlugin::createWidget(QWidget *parent)
+{
+  return new TextView(parent);
+}
+
+bool WidgetPlugin::isInitialized() const
+{
+    return m_initialized;
+}
+
+void WidgetPlugin::initialize(QDesignerFormEditorInterface *)
+{
+
+  if (m_initialized)
+    return;
+
+  m_initialized = true;
+}