Gui: Refactor navigation animations

- Animations are played through an Animator
- Standard animations have a fixed duration and inherit from QVariantAnimation
- The animation duration can be changed in the preferences
- Fix animations when using the two arrows above the NaviCube
- Start an animation or start and wait for an animation
- Replaces standard camera animations (e.g. by selecting standard views or NaviCube) with FixedTimeAnimation
- Replace View3DInventorViewer's CameraAnimation with FixedTimeAnimation
- Replace OpenInventor navigation style infinite spin animation with SpinningAnimation
- Stops an active animation when a new animation is started
- Stops an active animation when the user starts dragging, panning or zooming
- Refactor reorientCamera so it can be used in animations
- Enable animations by default

src/Gui/NavigationAnimation.h

@@ -0,0 +1,96 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+/****************************************************************************
+ *                                                                          *
+ *   Copyright (c) 2023 Bas Ruigrok (Rexbas) <Rexbas@proton.me>             *
+ *                                                                          *
+ *   This file is part of FreeCAD.                                          *
+ *                                                                          *
+ *   FreeCAD is free software: you can redistribute it and/or modify it     *
+ *   under the terms of the GNU Lesser General Public License as            *
+ *   published by the Free Software Foundation, either version 2.1 of the   *
+ *   License, or (at your option) any later version.                        *
+ *                                                                          *
+ *   FreeCAD is distributed in the hope that it will be useful, but         *
+ *   WITHOUT ANY WARRANTY; without even the implied warranty of             *
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU       *
+ *   Lesser General Public License for more details.                        *
+ *                                                                          *
+ *   You should have received a copy of the GNU Lesser General Public       *
+ *   License along with FreeCAD. If not, see                                *
+ *   <https://www.gnu.org/licenses/>.                                       *
+ *                                                                          *
+ ***************************************************************************/
+
+#ifndef GUI_NAVIGATIONANIMATION_H
+#define GUI_NAVIGATIONANIMATION_H
+
+#include "NavigationStyle.h"
+#include <Inventor/SbRotation.h>
+#include <Inventor/SbVec3f.h>
+#include <QVariantAnimation>
+
+namespace Gui
+{
+
+class GuiExport NavigationAnimation : protected QVariantAnimation
+{
+public:
+    explicit NavigationAnimation(NavigationStyle* navigation);
+
+protected:
+    NavigationStyle* navigation;
+
+    virtual void initialize() = 0;
+    virtual void update(const QVariant& value) = 0;
+    virtual void stopAnimation();
+
+private:
+    bool started;
+
+    void startAnimation(QAbstractAnimation::DeletionPolicy policy = KeepWhenStopped);
+    void updateCurrentValue(const QVariant& value) override;
+
+    friend class NavigationAnimator;
+};
+
+class GuiExport FixedTimeAnimation : public NavigationAnimation
+{
+public:
+    explicit FixedTimeAnimation(NavigationStyle* navigation, const SbRotation& orientation,
+                                const SbVec3f& rotationCenter, const SbVec3f& translation,
+                                int duration);
+
+private:
+    float angularVelocity; // [rad/ms]
+    SbVec3f linearVelocity; // [/ms]
+
+    SbRotation targetOrientation;
+    SbVec3f targetTranslation;
+
+    float prevAngle;
+    SbVec3f prevTranslation;
+
+    SbVec3f rotationCenter;
+    SbVec3f rotationAxis;
+
+    void initialize() override;
+    void update(const QVariant& value) override;
+};
+
+class GuiExport SpinningAnimation : public NavigationAnimation
+{
+public:
+    explicit SpinningAnimation(NavigationStyle* navigation, const SbVec3f& axis, float velocity);
+
+private:
+    SbVec3f rotationAxis;
+    float prevAngle;
+
+    void initialize() override;
+    void update(const QVariant& value) override;
+    void stopAnimation() override;
+};
+
+} // namespace Gui
+
+#endif // GUI_NAVIGATIONANIMATION_H