Examples: Add missing include guards

Pick-to: 6.5 6.4 6.2
Task-number: QTBUG-109394
Change-Id: I09a1b522d0faeb2346e1e075141f1e810c8155f7
Reviewed-by: Amir Masoud Abdol <amir.abdol@qt.io>
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>

examples/opengl/hellowindow/hellowindow.h

@@ -1,6 +1,9 @@
 // Copyright (C) 2016 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
 
+#ifndef HELLOWINDOW_H
+#define HELLOWINDOW_H
+
 #include <QWindow>
 
 #include <QColor>
@@ -70,3 +73,5 @@ private:
     QColor m_color;
     const QSharedPointer<Renderer> m_renderer;
 };
+
+#endif // HELLOWINDOW_H

examples/opengl/openglwindow/openglwindow.h

@@ -1,6 +1,9 @@
 // Copyright (C) 2016 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
 
+#ifndef OPENGLWINDOW_H
+#define OPENGLWINDOW_H
+
 #include <QWindow>
 #include <QOpenGLFunctions>
 
@@ -42,3 +45,4 @@ private:
 };
 //! [1]
 
+#endif // OPENGLWINDOW_H

examples/opengl/paintedwindow/paintedwindow.h

@@ -1,6 +1,9 @@
 // Copyright (C) 2016 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
 
+#ifndef PAINTEDWINDOW_H
+#define PAINTEDWINDOW_H
+
 #include <QWindow>
 
 #include <QtGui/qopengl.h>
@@ -55,3 +58,5 @@ private:
     QPropertyAnimation *m_animation;
     QTimer *m_paintTimer;
 };
+
+#endif // PAINTEDWINDOW_H

examples/qpa/windows/window.h

@@ -1,6 +1,9 @@
 // Copyright (C) 2016 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
 
+#ifndef WINDOW_H
+#define WINDOW_H
+
 #include <QWindow>
 #include <QImage>
 
@@ -34,3 +37,5 @@ private:
     QBackingStore *m_backingStore;
     int m_renderTimer;
 };
+
+#endif // WINDOW_H

examples/vulkan/hellovulkantexture/hellovulkantexture.h

@@ -1,6 +1,9 @@
 // Copyright (C) 2017 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
 
+#ifndef HELLOVULKANTEXTURE_H
+#define HELLOVULKANTEXTURE_H
+
 #include <QVulkanWindow>
 #include <QImage>
 
@@ -59,3 +62,5 @@ class VulkanWindow : public QVulkanWindow
 public:
     QVulkanWindowRenderer *createRenderer() override;
 };
+
+#endif // HELLOVULKANTEXTURE_H

examples/vulkan/hellovulkanwidget/hellovulkanwidget.h

@@ -1,6 +1,9 @@
 // Copyright (C) 2017 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
 
+#ifndef HELLOVULKANWIDGET_H
+#define HELLOVULKANWIDGET_H
+
 #include "../shared/trianglerenderer.h"
 #include <QWidget>
 
@@ -51,3 +54,5 @@ signals:
     void vulkanInfoReceived(const QString &text);
     void frameQueued(int colorValue);
 };
+
+#endif // HELLOVULKANWIDGET_H

examples/vulkan/hellovulkanwindow/hellovulkanwindow.h

@@ -1,6 +1,9 @@
 // Copyright (C) 2017 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
 
+#ifndef HELLOVULKANWINDOW_H
+#define HELLOVULKANWINDOW_H
+
 #include <QVulkanWindow>
 
 //! [0]
@@ -28,3 +31,5 @@ public:
     QVulkanWindowRenderer *createRenderer() override;
 };
 //! [0]
+
+#endif // HELLOVULKANWINDOW_H

examples/vulkan/shared/trianglerenderer.h

@@ -1,6 +1,9 @@
 // Copyright (C) 2017 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
 
+#ifndef TRIANGLERENDERER_H
+#define TRIANGLERENDERER_H
+
 #include <QVulkanWindow>
 
 class TriangleRenderer : public QVulkanWindowRenderer
@@ -36,3 +39,5 @@ protected:
     QMatrix4x4 m_proj;
     float m_rotation = 0.0f;
 };
+
+#endif // TRIANGLERENDERER_H

examples/widgets/animation/easing/window.h

@@ -1,6 +1,9 @@
 // Copyright (C) 2016 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
 
+#ifndef WINDOW_H
+#define WINDOW_H
+
 #include <QtWidgets>
 
 #include "ui_form.h"
@@ -37,3 +40,5 @@ private:
     Animation *m_anim;
     QSize m_iconSize;
 };
+
+#endif // WINDOW_H

examples/widgets/graphicsview/flowlayout/flowlayout.h

@@ -1,6 +1,9 @@
 // Copyright (C) 2016 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
 
+#ifndef FLOWLAYOUT_H
+#define FLOWLAYOUT_H
+
 #include <QGraphicsLayout>
 
 class FlowLayout : public QGraphicsLayout
@@ -37,3 +40,5 @@ inline void FlowLayout::addItem(QGraphicsLayoutItem *item)
 {
     insertItem(-1, item);
 }
+
+#endif // FLOWLAYOUT_H

examples/widgets/graphicsview/flowlayout/window.h

@@ -1,6 +1,9 @@
 // Copyright (C) 2016 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
 
+#ifndef WINDOW_H
+#define WINDOW_H
+
 #include <QGraphicsWidget>
 
 class Window : public QGraphicsWidget
@@ -9,3 +12,5 @@ class Window : public QGraphicsWidget
 public:
     Window(QGraphicsItem *parent = nullptr);
 };
+
+#endif // WINDOW_H

examples/widgets/widgets/validators/validatorwidget.h

@@ -1,6 +1,9 @@
 // Copyright (C) 2018 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
 
+#ifndef VALIDATORWIDGET_H
+#define VALIDATORWIDGET_H
+
 #include <QWidget>
 
 #include "ui_validators.h"
@@ -15,3 +18,5 @@ private slots:
     void updateValidator();
     void updateDoubleValidator();
 };
+
+#endif // VALIDATORWIDGET_H