Attaching right mouse click to cast spell

The right mouse click will have to go through quite a few function calls before calling the avatar's CastSpell method. The call graph would look something like the following screenshot:

A few things happen between right click and spell cast. They are as follows:

• As we saw before, all user mouse and keyboard interactions are routed through the Avatar object. When the Avatar object detects a right-click, it will pass the click event to HUD through AAvatar::MouseRightClicked().
• Recall from Chapter 10, Inventory System and Pickup Items where we used a struct Widget class to keep track of the items the player had picked up. struct Widget only had three members:

  struct Widget
  {
    Icon icon;
    FVector2D pos, size;
    ///.. and some member functions
  };

  We will need to add an extra property for struct Widget class to remember the spell it casts.

  The HUD will determine if the click event was inside Widget in AMyHUD::MouseRightClicked().

• If the click was on...