feat: improve focus handling

sonic-radiance.love/birb/modules/gui/elements/parent.lua

@@ -10,7 +10,7 @@ function GuiElement:new(name, x, y, w, h)
     self.isVisible = true
     self.screen = nil
 
-    self.depth = 0
+    self.depth = 10
 
     self.tweens = TweenManager(self)
     self.assets = self:getAssets()
@@ -62,7 +62,7 @@ end
 
 function GuiElement:getFocus()
     local gui = self:getGui()
-    gui.focusedElement = self.name
+    gui:setFocus(self.name)
 end
 
 function GuiElement:haveFocus()
@@ -73,7 +73,7 @@ end
 function GuiElement:looseFocus()
     if (self:haveFocus()) then
         local gui = self:getGui()
-        gui.focusedElement = nil
+        gui:removeFocus()
     end
 end
 

sonic-radiance.love/birb/modules/gui/mixins/elements.lua

@@ -3,6 +3,7 @@ local ElementList = Object:extend()
 function ElementList:initElements()
     self.elements = {}
     self.focusedElement = nil
+    self.lastFocused = nil
     self.nbrElement = 0
 end
 
@@ -18,10 +19,28 @@ end
 
 function ElementList:setFocus(name)
     assert(self:elementExists(name), "Element " .. name .. " doesn't exists")
+    self:storeLastFocus()
     self.focusedElement = name
     self.elements[name].isVisible = true
 end
 
+function ElementList:removeFocus()
+    self:storeLastFocus()
+    self.focusedElement = nil
+end
+
+function ElementList:storeLastFocus()
+    if (self.focusedElement ~= nil) then
+        self.lastFocused = self.focusedElement
+    end
+end
+
+function ElementList:setLastFocus()
+    if (self:elementExists(self.lastFocused)) then
+        self:setFocus(self.lastFocused)
+    end
+end
+
 function ElementList:elementExists(name)
     return (self:getElement(name) ~= nil)
 end