GUI fixes; Mesh loader WIP

koptilnya/gui/elements/panel.txt

@@ -16,6 +16,7 @@ function EPanel:initialize()
     Element.initialize(self)
     
     self._minimized = false
+    self._lastHeight = 0
     
     self.title = ELabel:new()
     self.title:setPos(12, 8)
@@ -30,17 +31,18 @@ function EPanel:initialize()
     }
 
     self.minimizeButton = EButton:new()
-    self.minimizeButton:setFont(GUI.fonts["icons"])
     self.minimizeButton:setText("_")
     self.minimizeButton:setSize(32, 32)
     self.minimizeButton:setRadius(0)
     self.minimizeButton:setColorScheme(colorScheme)
-    self.minimizeButton:setEnabled(false)
+    self.minimizeButton.onClick = function()
+        self:minimizeMaximize()
+    end
     self:addChild(self.minimizeButton)
     
     self.closeButton = EButton:new()
     self.closeButton:setFont(GUI.fonts["icons"])
-    self.closeButton:setText("X")
+    self.closeButton:setText(string.utf8char(10005))
     self.closeButton:setSize(32, 32)
     self.closeButton:setRadius(0)
     self.closeButton:setColorScheme(colorScheme)
@@ -85,8 +87,48 @@ function EPanel:close()
 end
 
 function EPanel:open()
-    self:setVisible(false)
-    self:setEnabled(false)
+    self:setVisible(true)
+    self:setEnabled(true)
+end
+
+function EPanel:minimize()
+    self._lastHeight = self:getHeight()
+
+    self.minimizeButton:setText(string.utf8char(10063))
+    self:setMinimized(true)
+    self:setHeight(34)
+
+    local child = self._firstChild
+    while child do
+        if child ~= self.title and child ~= self.minimizeButton and child ~= self.closeButton then
+            child:setVisible(false)
+        end
+
+        child = child._nextSibling
+    end
+end
+
+function EPanel:maximize()
+    self.minimizeButton:setText("_")
+    self:setMinimized(false)
+    self:setHeight(self._lastHeight)
+
+    local child = self._firstChild
+    while child do
+        if child ~= self.title and child ~= self.minimizeButton and child ~= self.closeButton then
+            child:setVisible(true)
+        end
+
+        child = child._nextSibling
+    end
+end
+
+function EPanel:minimizeMaximize()
+    if self:isMinimized() then
+        self:maximize()
+    else
+        self:minimize()
+    end
 end
 
 function EPanel:onMousePressed(x, y, key, keyName)
@@ -125,8 +167,8 @@ function EPanel:onMouseLeave()
 end
 
 function EPanel:performLayout(w, h)
-    self.closeButton:setPos(w - 33, 1)
     self.minimizeButton:setPos(w - 65, 1)
+    self.closeButton:setPos(w - 33, 1)
 end
 
 function EPanel:paint(x, y, w, h)