Save miniwindows states

modules/corelib/widgets/uiminiwindowcontainer.lua

@@ -2,6 +2,7 @@ UIMiniWindowContainer = extends(UIWidget)
 
 function UIMiniWindowContainer.create()
   local container = UIMiniWindowContainer.internalCreate()
+  container.scheduledWidgets = {}
   container:setFocusable(false)
   container:setPhantom(true)
   return container
@@ -14,7 +15,9 @@ function UIMiniWindowContainer:onDrop(widget, mousePos)
   		return true
   	end
 
-  	oldParent:removeChild(widget)
+    if oldParent then
+  	  oldParent:removeChild(widget)
+    end
 
   	if widget.movedWidget then
   		local index = self:getChildIndex(widget.movedWidget)
@@ -27,6 +30,56 @@ function UIMiniWindowContainer:onDrop(widget, mousePos)
   end
 end
 
+function UIMiniWindowContainer:swapInsert(widget, index)
+  local oldParent = widget:getParent()
+  local oldIndex = self:getChildIndex(widget)
+
+  if oldParent == self and oldIndex ~= index then
+    local oldWidget = self:getChildByIndex(index)
+    self:removeChild(oldWidget)
+    self:insertChild(oldIndex, oldWidget)
+    self:removeChild(widget)
+    self:insertChild(index, widget)
+  end
+end
+
+function UIMiniWindowContainer:scheduleInsert(widget, index)
+  if index - 1 > self:getChildCount() then
+    if self.scheduledWidgets[index] then
+      warning('replacing scheduled widget id ' .. widget:getId())
+    end
+    self.scheduledWidgets[index] = widget
+  else
+    local oldParent = widget:getParent()
+    if oldParent ~= self then
+      oldParent:removeChild(widget)
+      self:insertChild(index, widget)
+    else
+      self:swapInsert(widget, index)
+    end
+
+    while true do
+      local placed = false
+      for nIndex,nWidget in pairs(self.scheduledWidgets) do
+        if nIndex - 1 <= self:getChildCount() then
+          self:insertChild(nIndex, nWidget)
+          self.scheduledWidgets[nIndex] = nil
+          placed = true
+          break
+        end
+      end
+      if not placed then break end
+    end
+  end
+end
+
+function UIMiniWindowContainer:saveChildren()
+  local children = self:getChildren()
+  for i=1,#children do
+    children[i]:saveParentIndex(self:getId(), i)
+  end
+end
+
 function UIMiniWindowContainer:getClassName()
   return 'UIMiniWindowContainer'
 end