Refactoring and flexibility changes

* Split game module into game and game_interface
* Move core_lib to corelib
* Move miniwindow to corelib
* Introduce init.lua script for initializing the client, giving much more flexibility
* OTClient is no longer Application derived and is much simpler

modules/corelib/ui/tooltip.lua

@@ -0,0 +1,96 @@
+ToolTip = {}
+
+-- private variables
+local toolTipLabel
+local currentHoveredWidget
+
+-- private functions
+local function moveToolTip(tooltip)
+  if not tooltip:isVisible() or tooltip:getOpacity() < 0.1 then return end
+
+  local pos = g_window.getMousePosition()
+  pos.y = pos.y + 1
+  local xdif = g_window.getSize().width - (pos.x + tooltip:getWidth())
+  if xdif < 2 then
+    pos.x = pos.x - tooltip:getWidth() - 3
+  else
+    pos.x = pos.x + 10
+  end
+  tooltip:setPosition(pos)
+end
+
+local function onWidgetHoverChange(widget, hovered)
+  if hovered then
+    if widget.tooltip and not Mouse.isPressed() then
+      ToolTip.display(widget.tooltip)
+      currentHoveredWidget = widget
+    end
+  else
+    if widget == currentHoveredWidget then
+      ToolTip:hide()
+      currentHoveredWidget = nil
+    end
+  end
+end
+
+local function onWidgetStyleApply(widget, styleName, styleNode)
+  if styleNode.tooltip then
+    widget.tooltip = styleNode.tooltip
+  end
+end
+
+-- public functions
+function ToolTip.init()
+  connect(UIWidget, {  onStyleApply = onWidgetStyleApply,
+                       onHoverChange = onWidgetHoverChange})
+
+  addEvent(function()
+    toolTipLabel = createWidget('UILabel', rootWidget)
+    toolTipLabel:setId('toolTip')
+    toolTipLabel:setBackgroundColor('#111111cc')
+    toolTipLabel:setTextAlign(AlignCenter)
+    toolTipLabel:hide()
+    toolTipLabel.onMouseMove = moveToolTip
+  end)
+end
+
+function ToolTip.terminate()
+  disconnect(UIWidget, { onStyleApply = onWidgetStyleApply,
+                         onHoverChange = onWidgetHoverChange })
+
+  currentHoveredWidget = nil
+  toolTipLabel:destroy()
+  toolTipLabel = nil
+
+  ToolTip = nil
+end
+
+function ToolTip.display(text)
+  if text == nil then return end
+  if not toolTipLabel then return end
+
+  toolTipLabel:setText(text)
+  toolTipLabel:resizeToText()
+  toolTipLabel:resize(toolTipLabel:getWidth() + 4, toolTipLabel:getHeight() + 4)
+  toolTipLabel:show()
+  toolTipLabel:raise()
+  toolTipLabel:enable()
+  Effects.fadeIn(toolTipLabel, 100)
+  moveToolTip(toolTipLabel)
+end
+
+function ToolTip.hide()
+  Effects.fadeOut(toolTipLabel, 100)
+end
+
+-- UIWidget extensions
+function UIWidget:setTooltip(text)
+  self.tooltip = text
+end
+
+function UIWidget:getTooltip()
+  return self.tooltip
+end
+
+ToolTip.init()
+connect(g_app, { onTerminate = ToolTip.terminate })