Start working on multi-line selection for console

Unfortunately UITextEdit is really bad in terms of performance. It
cannot be used as overlying widget (just like in terminal). On the other
hand we could optimize it by rewriting (unfortunately) the whole widget.

There still is a lot of things to do, but for now it is possible to
select several lines of text and copy it using CTRL + C. In order to
make text copyable in context menu it will be required to override
onMousePress (return true).

modules/game_console/console.lua

@@ -117,9 +117,15 @@ function init()
     if not consoleBuffer then return false end
 
     local consoleLabel = consoleBuffer:getFocusedChild()
-    if not consoleLabel or not consoleLabel:hasSelection() then return false end
+    if not consoleLabel.selectionChildFirst or not consoleLabel.selectionChildLast then return false end
 
-    g_window.setClipboardText(consoleLabel:getSelection())
+    local text = {}
+    for selectionChild = consoleLabel.selectionChildFirst, consoleLabel.selectionChildLast do
+      local label = consoleLabel:getParent():getChildByIndex(selectionChild)
+      table.insert(text, label:getSelection())
+    end
+
+    g_window.setClipboardText(table.concat(text, '\r\n'))
     return true
   end
 
@@ -576,10 +582,62 @@ function addTabText(text, speaktype, tab, creatureName)
     end
   end
 
+  -- remove selection
+  local removeSelectedText = function(self)
+    local parent = self:getParent()
+    if self.selectionChildFirst and self.selectionChildLast then
+        for selectionChild = self.selectionChildFirst, self.selectionChildLast do
+          local label = parent:getChildByIndex(selectionChild)
+          if label ~= self then
+            label:clearSelection()
+          end
+        end
+    end
+  end
+
   label.name = creatureName
-  label.onMouseRelease = function (self, mousePos, mouseButton)
+  label.onMouseRelease = function(self, mousePos, mouseButton)
+    -- TODO: regain lost selection
     processMessageMenu(mousePos, mouseButton, creatureName, text, self, tab)
   end
+  label.onFocusChange = function(self, focused, reason)
+    -- TODO: we are losing focus on context menu and therefore the selection
+    if not focused then removeSelectedText(self) end
+  end
+  label.onMousePress = function(self, mousePos, button)
+    if button == MouseLeftButton then removeSelectedText(self) end
+  end
+  label.onMouseMove = function(self, mousePos, mouseMoved)
+    if self:isPressed() then
+      local parent = self:getParent()
+      local selfIndex = parent:getChildIndex(self)
+      local child = parent:getChildByPos(mousePos)
+      local childIndex = parent:getChildIndex(child)
+
+      -- remove old selection
+      removeSelectedText(self)
+
+      -- choose new selection
+      if child and child ~= self then
+        self.selectionChildFirst = math.min(selfIndex, childIndex)
+        self.selectionChildLast = math.max(selfIndex, childIndex)
+
+        for selectionChild = self.selectionChildFirst + 1, self.selectionChildLast - 1 do
+          local label = parent:getChildByIndex(selectionChild)
+          label:selectAll()
+        end
+
+        local textPos = child:getTextPos(mousePos)
+        if childIndex > selfIndex then
+          child:setSelection(0, textPos)
+        else
+          child:setSelection(string.len(child:getText()), textPos)
+        end
+      elseif not child then
+        -- TODO: out of bonding rect selection
+      end
+    end
+  end
 
   if consoleBuffer:getChildCount() > MAX_LINES then
     consoleBuffer:getFirstChild():destroy()