Merge pull request #27 from laelnasan/utf8-printing-support

Utf8 printing support

src/ltui/label.lua

@@ -127,8 +127,20 @@ function label:splitext(text, width)
     for idx = 1, #lines do
         local line = lines[idx]
         while #line > width do
-            table.insert(result, line:sub(1, width))
+            local size = 0
-            line = line:sub(width + 1)
+            for i = 1, #line do
+                if (line:byte(i) & 0xc0) ~= 0x80 then
+                    size = size + 1
+                    if size > width then
+                        table.insert(result, line:sub(1, i - 1))
+                        line = line:sub(i)
+                        break
+                    end
+                end
+            end
+            if size <= width then
+                break
+            end
         end
         table.insert(result, line)
     end

src/ltui/textedit.lua

@@ -77,16 +77,18 @@ function textedit:on_event(e)
 
     -- update text
     if e.type == event.ev_keyboard then
-        if e.key_code > 0x1f and e.key_code < 0x7f then
+        if e.key_name == "Enter" and self:option("multiline") then
-            self:text_set(self:text() .. e.key_name)
-            return true
-        elseif e.key_name == "Enter" and self:option("multiline") then
             self:text_set(self:text() .. '\n')
             return true
         elseif e.key_name == "Backspace" then
             local text = self:text()
             if #text > 0 then
-                self:text_set(text:sub(1, #text - 1))
+                local size = 1
+                -- while continuation byte
+                while (text:byte(#text - size + 1) & 0xc0) == 0x80 do
+                    size = size + 1
+                end
+                self:text_set(text:sub(1, #text - size))
             end
             return true
         elseif e.key_name == "CtrlV" then
@@ -95,6 +97,9 @@ function textedit:on_event(e)
                 self:text_set(self:text() .. pastetext)
             end
             return true
+        elseif e.key_code > 0x1f and e.key_code < 0xf8 then
+            self:text_set(self:text() .. string.char(e.key_code))
+            return true
         end
     end