fix format problems

Samples/UIWidgetsSamples_2019_4/Assets/UIWidgetsExample.cs

             // add material icons, familyName must be "Material Icons"
             // FontManager.instance.addFont(Resources.Load<Font>(path: "path to material icons"), "Material Icons");
 
-            // Pass the C# Debug function reference to C++ to save, and then C++ calls C# through the function pointer
-            NativeConsole.InitLogMessageFromCppDelegate(NativeConsole.LogMessageFromCpp);
-             
             base.OnEnable();
          }
 

com.unity.uiwidgets/Runtime/engine2/UIWidgetsPanel.cs

                 _width, _height, _devicePixelRatio, Application.streamingAssetsPath);
 
             Input_OnEnable();
+            NativeConsole.InitNativeConsoleDelegate(NativeConsole.LogMessageFromCpp);
         }
 
         protected virtual void main() {

engine/src/shell/platform/unity/uiwidgets_panel.cc

 #include "shell/common/switches.h"
 #include "uiwidgets_system.h"
 #include "unity_external_texture_gl.h"
-#include "uiwidgets_log.h"
+#include "unity_console.h"
 
 namespace uiwidgets {
 
 UIWidgetsPanel_onMouseDown(UIWidgetsPanel* panel, float x, float y,
                            int button) {
   panel->OnMouseDown(x, y, button);
-  UnityLog("OnMouseDown");
+  UnityConsole::WriteLine("OnMouseDown");
-  UnityLog("OnMouseUp");
+  UnityConsole::WriteLine("OnMouseUp");
 }
 
 UIWIDGETS_API(void)

com.unity.uiwidgets/Runtime/engine2/native_console.cs

+using UnityEngine;
+using AOT;
+using System;
+using System.Runtime.InteropServices;
+using NativeBindings = Unity.UIWidgets.ui.NativeBindings;
+
+public static class NativeConsole {
+    public delegate void LogDelegate(IntPtr message, int iSize);
+
+    [DllImport(NativeBindings.dllName)]
+    public static extern void InitNativeConsoleDelegate(LogDelegate log);
+
+    [MonoPInvokeCallback(typeof(LogDelegate))]
+    public static void LogMessageFromCpp(IntPtr message, int iSize) {
+        Debug.Log(Marshal.PtrToStringAnsi(message, iSize));
+    }
+
+}

engine/src/shell/platform/unity/unity_console.h

+#include "runtime/mono_api.h"
+
+namespace uiwidgets {
+
+typedef void (*LogDelegate)(char* message, int iSize);
+
+extern "C"{
+class UnityConsole{
+ public:
+   static void (*Log)(char* message,int iSize);
+   /*
+   output the log to unity editor console window
+   */
+   static void WriteLine(const char* fmt, ...){ 
+   char log_str[512] = { 0 };
+   va_list ap;
+   va_start(ap, fmt);
+   sprintf_s(log_str, fmt, ap);
+   Log(log_str, strlen(log_str));
+   va_end(ap);
+  }
+};
+  void (*UnityConsole::Log)(char* message, int iSize);
+  UIWIDGETS_API(void) 
+  InitNativeConsoleDelegate(LogDelegate Log){ UnityConsole::Log = Log; }
+}
+} // namespace uiwidgets

Samples/UIWidgetsSamples_2019_4/Assets/NativeConsole.cs

-using UnityEngine;
-using AOT;
-using System;
-using System.Runtime.InteropServices;
-
-public static class NativeConsole
-{
-    public delegate void LogDelegate(IntPtr message, int iSize);
-
-    [DllImport("libUIWidgets_d.dll")]
-    public static extern void InitLogMessageFromCppDelegate(LogDelegate log);
-
-    //C# Function for C++'s call
-    [MonoPInvokeCallback(typeof(LogDelegate))]
-    public static void LogMessageFromCpp(IntPtr message, int iSize)
-    {
-        Debug.Log(Marshal.PtrToStringAnsi(message, iSize));
-    }
-
-}
-

engine/src/shell/platform/unity/uiwidgets_log.h

-#include "runtime/mono_api.h"
-
-namespace uiwidgets {
-// use UnityLog just like printf, and this will output the result to unity
-#define UnityLog(...)   {char log_str[512] = { 0 }; sprintf_s(log_str, __VA_ARGS__); Debug::Log(log_str, strlen(log_str));}
-extern "C"{
-class Debug{
- public:
-  static void (*Log)(char* message,int iSize);
-};
-
-  void (*Debug::Log)(char* message, int iSize);
-  // export c++ function interface for c#
-  UIWIDGETS_API(void) 
-  InitLogMessageFromCppDelegate(void (*Log)(char* message, int iSize)){ Debug::Log = Log; }
-}
-} // namespace uiwidgets