animations: Refactor AnimatedVariable (#4911)

* animation: Refactor AnimatedVariable

This commit decomposes the AnimatedVariable class into a base class
with the common attribute to all variable types and a templated derived
type containing strongly typed info on the type being animated.

Access to the typed version is perfomed using the visitor pattern. A
utility is provided to build a visitor on the fly using lambdas.

Adding a new type to be animated should just be a matter of adding the
typed in the list defined by the ANIMABLE_TYPES macro

The size of the commit is justified by the API change in the
AnimatedVariable class. No more vec(), fl() or col() method but a unified
value() method.

* animation: Remove visitor pattern

* animation: Fix coding style

* animation: Fix coding style

1 files changed, 3 insertions, 3 deletions

diff --git a/src/desktop/Workspace.hpp b/src/desktop/Workspace.hpp
index d4915769..aea842e0 100644
--- a/src/desktop/Workspace.hpp
+++ b/src/desktop/Workspace.hpp
@@ -35,9 +35,9 @@ class CWorkspace {
     wl_array        m_wlrCoordinateArr;
 
     // for animations
-    CAnimatedVariable m_vRenderOffset;
-    CAnimatedVariable m_fAlpha;
-    bool              m_bForceRendering = false;
+    CAnimatedVariable<Vector2D> m_vRenderOffset;
+    CAnimatedVariable<float>    m_fAlpha;
+    bool                        m_bForceRendering = false;
 
     // "scratchpad"
     bool m_bIsSpecialWorkspace = false;