add key handlers to lua

samplecode/SampleLua.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SampleCode.h"
 #include "SkView.h"
 #include "SkLua.h"
 #include "SkCanvas.h"
 #include "Resources.h"
 #include "SkData.h"
 
 extern "C" {
 #include "lua.h"
 #include "lualib.h"
 #include "lauxlib.h"
 }
 
 #define LUA_FILENAME    "test.lua"
 //#define LUA_FILENAME    "slides.lua"
 
 static const char gDrawName[] = "onDrawContent";
 static const char gClickName[] = "onClickHandler";
+static const char gUnicharName[] = "onCharHandler";
 
 static const char gMissingCode[] = ""
     "local paint = Sk.newPaint()"
     "paint:setAntiAlias(true)"
     "paint:setTextSize(30)"
     ""
     "function onDrawContent(canvas)"
     "   canvas:drawText('missing \"test.lua\"', 20, 50, paint)"
     "end"
     ;
@@ skipping 36 matching lines @@
     }
 
 protected:
     virtual bool onQuery(SkEvent* evt) SK_OVERRIDE {
         if (SampleCode::TitleQ(*evt)) {
             SampleCode::TitleR(evt, "Lua");
             return true;
         }
         SkUnichar uni;
         if (SampleCode::CharQ(*evt, &uni)) {
+            lua_State* L = this->ensureLua();
+            lua_getglobal(L, gUnicharName);
+            if (lua_isfunction(L, -1)) {
+                SkString str;
+                str.appendUnichar(uni);
+                fLua->pushString(str.c_str());
+                if (lua_pcall(L, 1, 1, 0) != LUA_OK) {
+                    SkDebugf("lua err: %s\n", lua_tostring(L, -1));
+                } else {
+                    if (lua_isboolean(L, -1) && lua_toboolean(L, -1)) {
+                        this->inval(NULL);
+                        return true;
+                    }
+                }
+            }
         }
         return this->INHERITED::onQuery(evt);
     }
 
     virtual void onDrawContent(SkCanvas* canvas) SK_OVERRIDE {
         lua_State* L = this->ensureLua();
 
         lua_getglobal(L, gDrawName);
         if (!lua_isfunction(L, -1)) {
             int t = lua_type(L, -1);
@@ skipping 38 matching lines @@
 private:
     SkLua* fLua;
 
     typedef SampleView INHERITED;
 };
 
 //////////////////////////////////////////////////////////////////////////////
 
 static SkView* MyFactory() { return new LuaView; }
 static SkViewRegister reg(MyFactory);