158 lines
4.6 KiB
C++
158 lines
4.6 KiB
C++
/*
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* Copyright 2013 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "SampleCode.h"
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#include "SkView.h"
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#include "SkLua.h"
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#include "SkCanvas.h"
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#include "Resources.h"
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#include "SkData.h"
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extern "C" {
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#include "lua.h"
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#include "lualib.h"
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#include "lauxlib.h"
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}
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//#define LUA_FILENAME "test.lua"
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#define LUA_FILENAME "slides.lua"
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static const char gDrawName[] = "onDrawContent";
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static const char gClickName[] = "onClickHandler";
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static const char gUnicharName[] = "onCharHandler";
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static const char gMissingCode[] = ""
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"local paint = Sk.newPaint()"
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"paint:setAntiAlias(true)"
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"paint:setTextSize(30)"
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""
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"function onDrawContent(canvas)"
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" canvas:drawText('missing \"test.lua\"', 20, 50, paint)"
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"end"
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;
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class LuaView : public SampleView {
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public:
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LuaView() : fLua(NULL) {}
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virtual ~LuaView() {
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SkDELETE(fLua);
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}
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void setImageFilename(lua_State* L) {
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SkString str = GetResourcePath("mandrill_256.png");
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lua_getglobal(L, "setImageFilename");
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if (lua_isfunction(L, -1)) {
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fLua->pushString(str.c_str());
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if (lua_pcall(L, 1, 0, 0) != LUA_OK) {
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SkDebugf("lua err: %s\n", lua_tostring(L, -1));
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}
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}
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}
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lua_State* ensureLua() {
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if (NULL == fLua) {
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fLua = SkNEW(SkLua);
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SkString str = GetResourcePath(LUA_FILENAME);
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SkData* data = SkData::NewFromFileName(str.c_str());
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if (data) {
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fLua->runCode(data->data(), data->size());
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data->unref();
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this->setImageFilename(fLua->get());
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} else {
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fLua->runCode(gMissingCode);
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}
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}
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return fLua->get();
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}
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protected:
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virtual bool onQuery(SkEvent* evt) SK_OVERRIDE {
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if (SampleCode::TitleQ(*evt)) {
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SampleCode::TitleR(evt, "Lua");
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return true;
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}
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SkUnichar uni;
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if (SampleCode::CharQ(*evt, &uni)) {
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lua_State* L = this->ensureLua();
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lua_getglobal(L, gUnicharName);
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if (lua_isfunction(L, -1)) {
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SkString str;
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str.appendUnichar(uni);
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fLua->pushString(str.c_str());
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if (lua_pcall(L, 1, 1, 0) != LUA_OK) {
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SkDebugf("lua err: %s\n", lua_tostring(L, -1));
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} else {
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if (lua_isboolean(L, -1) && lua_toboolean(L, -1)) {
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this->inval(NULL);
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return true;
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}
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}
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}
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}
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return this->INHERITED::onQuery(evt);
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}
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virtual void onDrawContent(SkCanvas* canvas) SK_OVERRIDE {
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lua_State* L = this->ensureLua();
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lua_getglobal(L, gDrawName);
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if (!lua_isfunction(L, -1)) {
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int t = lua_type(L, -1);
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SkDebugf("--- expected %s function %d, ignoring.\n", gDrawName, t);
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lua_pop(L, 1);
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} else {
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// does it make sense to try to "cache" the lua version of this
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// canvas between draws?
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fLua->pushCanvas(canvas);
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fLua->pushScalar(this->width());
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fLua->pushScalar(this->height());
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if (lua_pcall(L, 3, 1, 0) != LUA_OK) {
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SkDebugf("lua err: %s\n", lua_tostring(L, -1));
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} else {
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if (lua_isboolean(L, -1) && lua_toboolean(L, -1)) {
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this->inval(NULL);
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}
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}
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}
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}
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virtual SkView::Click* onFindClickHandler(SkScalar x, SkScalar y,
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unsigned modi) SK_OVERRIDE {
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lua_State* L = this->ensureLua();
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lua_getglobal(L, gClickName);
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if (lua_isfunction(L, -1)) {
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fLua->pushScalar(x);
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fLua->pushScalar(y);
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if (lua_pcall(L, 2, 1, 0) != LUA_OK) {
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SkDebugf("lua err: %s\n", lua_tostring(L, -1));
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} else {
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if (lua_isboolean(L, -1) && lua_toboolean(L, -1)) {
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this->inval(NULL);
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}
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}
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}
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return this->INHERITED::onFindClickHandler(x, y, modi);
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}
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virtual bool onClick(Click* click) SK_OVERRIDE {
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return this->INHERITED::onClick(click);
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}
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private:
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SkLua* fLua;
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typedef SampleView INHERITED;
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};
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//////////////////////////////////////////////////////////////////////////////
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static SkView* MyFactory() { return new LuaView; }
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static SkViewRegister reg(MyFactory);
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