better handling different window state, support fullscreen mode

diyac.h

@@ -37,11 +37,15 @@ enum diyac_node_descriptor_type
     // LAB_NODE_TREE,
     // LAB_NODE_SSD_BUTTON,
 };
-enum diyac_view_state
+struct diyac_view_state
 {
-    DIYAC_VIEW_NORMAL = 0,
-    DIYAC_VIEW_MAXIMIZE,
-    DIYAC_VIEW_FULL_SCREEN,
+    bool maximized;
+    bool fullscreen;
+    bool minimized;
+    /**
+     * if neither state is on, it means that 
+     * the current state is normal
+    */
 };
 
 struct diyac_seat
@@ -165,8 +169,8 @@ struct diyac_view
     struct wlr_xdg_surface *xdg_surface;
     struct wlr_xdg_toplevel *xdg_toplevel;
     struct wlr_scene_tree *scene_tree;
-    enum diyac_view_state state;
-    enum diyac_view_state requested;
+    struct diyac_view_state state;
+    struct diyac_view_state requested;
     /*
      * Geometry of the wlr_surface contained within the view, as
      * currently displayed. Should be kept in sync with the