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- /*
- * 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 "include/core/SkCanvas.h"
- #include "include/core/SkData.h"
- #include "include/utils/SkLua.h"
- #include "samplecode/Sample.h"
- #include "tools/Resources.h"
- extern "C" {
- #include "lua.h"
- #include "lualib.h"
- #include "lauxlib.h"
- }
- //#define LUA_FILENAME "lua/test.lua"
- #define LUA_FILENAME "lua/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"
- ;
- class LuaView : public Sample {
- public:
- LuaView() : fLua(nullptr) {}
- ~LuaView() override { delete fLua; }
- void setImageFilename(lua_State* L) {
- SkString str = GetResourcePath("images/mandrill_256.png");
- lua_getglobal(L, "setImageFilename");
- if (lua_isfunction(L, -1)) {
- fLua->pushString(str.c_str());
- if (lua_pcall(L, 1, 0, 0) != LUA_OK) {
- SkDebugf("lua err: %s\n", lua_tostring(L, -1));
- }
- }
- }
- lua_State* ensureLua() {
- if (nullptr == fLua) {
- fLua = new SkLua;
- sk_sp<SkData> data = GetResourceAsData(LUA_FILENAME);
- if (data) {
- fLua->runCode(data->data(), data->size());
- this->setImageFilename(fLua->get());
- } else {
- fLua->runCode(gMissingCode);
- }
- }
- return fLua->get();
- }
- protected:
- SkString name() override { return SkString("Lua"); }
- bool onChar(SkUnichar uni) override {
- 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)) {
- return true;
- }
- }
- }
- return false;
- }
- void onDrawContent(SkCanvas* canvas) override {
- lua_State* L = this->ensureLua();
- lua_getglobal(L, gDrawName);
- if (!lua_isfunction(L, -1)) {
- int t = lua_type(L, -1);
- SkDebugf("--- expected %s function %d, ignoring.\n", gDrawName, t);
- lua_pop(L, 1);
- } else {
- // does it make sense to try to "cache" the lua version of this
- // canvas between draws?
- fLua->pushCanvas(canvas);
- fLua->pushScalar(this->width());
- fLua->pushScalar(this->height());
- if (lua_pcall(L, 3, 1, 0) != LUA_OK) {
- SkDebugf("lua err: %s\n", lua_tostring(L, -1));
- }
- }
- }
- virtual Sample::Click* onFindClickHandler(SkScalar x, SkScalar y,
- ModifierKey modi) override {
- lua_State* L = this->ensureLua();
- lua_getglobal(L, gClickName);
- if (lua_isfunction(L, -1)) {
- fLua->pushScalar(x);
- fLua->pushScalar(y);
- fLua->pushString("down");
- if (lua_pcall(L, 3, 1, 0) != LUA_OK) {
- SkDebugf("lua err: %s\n", lua_tostring(L, -1));
- } else {
- if (lua_isboolean(L, -1) && lua_toboolean(L, -1)) {
- return new Click();
- }
- }
- }
- return this->INHERITED::onFindClickHandler(x, y, modi);
- }
- bool onClick(Click* click) override {
- const char* state = nullptr;
- switch (click->fState) {
- case InputState::kMove:
- state = "moved";
- break;
- case InputState::kUp:
- state = "up";
- break;
- default:
- break;
- }
- if (state) {
- lua_State* L = fLua->get();
- lua_getglobal(L, gClickName);
- fLua->pushScalar(click->fCurr.x());
- fLua->pushScalar(click->fCurr.y());
- fLua->pushString(state);
- lua_pcall(L, 3, 1, 0);
- return lua_isboolean(L, -1) && lua_toboolean(L, -1);
- }
- return true;
- }
- private:
- SkLua* fLua;
- typedef Sample INHERITED;
- };
- //////////////////////////////////////////////////////////////////////////////
- DEF_SAMPLE( return new LuaView(); )
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