/* * Copyright 2011 Google Inc. * * Use of this source code is governed by a BSD-style license that can be * found in the LICENSE file. */ #ifndef SampleCode_DEFINED #define SampleCode_DEFINED #include "include/core/SkColor.h" #include "include/core/SkPoint.h" #include "include/core/SkRefCnt.h" #include "include/core/SkString.h" #include "include/private/SkMacros.h" #include "tools/InputState.h" #include "tools/ModifierKey.h" #include "tools/Registry.h" #include "tools/SkMetaData.h" class SkCanvas; class Sample; using SampleFactory = Sample* (*)(); using SampleRegistry = sk_tools::Registry; #define DEF_SAMPLE(code) \ static Sample* SK_MACRO_APPEND_LINE(F_)() { code } \ static SampleRegistry SK_MACRO_APPEND_LINE(R_)(SK_MACRO_APPEND_LINE(F_)); /////////////////////////////////////////////////////////////////////////////// class Sample { public: Sample() : fBGColor(SK_ColorWHITE) , fWidth(0), fHeight(0) , fHaveCalledOnceBeforeDraw(false) {} virtual ~Sample() = default; SkScalar width() const { return fWidth; } SkScalar height() const { return fHeight; } void setSize(SkScalar width, SkScalar height); void setSize(const SkPoint& size) { this->setSize(size.fX, size.fY); } void setWidth(SkScalar width) { this->setSize(width, fHeight); } void setHeight(SkScalar height) { this->setSize(fWidth, height); } /** Call this to have the view draw into the specified canvas. */ virtual void draw(SkCanvas* canvas); virtual bool onChar(SkUnichar) { return false; } // Click handling class Click { public: virtual ~Click() = default; SkPoint fOrig = {0, 0}; SkPoint fPrev = {0, 0}; SkPoint fCurr = {0, 0}; InputState fState = InputState::kDown; ModifierKey fModifierKeys = ModifierKey::kNone; SkMetaData fMeta; }; bool mouse(SkPoint point, InputState clickState, ModifierKey modifierKeys); void setBGColor(SkColor color) { fBGColor = color; } bool animate(double nanos) { return this->onAnimate(nanos); } virtual SkString name() = 0; protected: /** Override to be notified of size changes. Overriders must call the super class. */ virtual void onSizeChange(); /** Override this if you might handle the click */ virtual Click* onFindClickHandler(SkScalar x, SkScalar y, ModifierKey modi); /** Override to track clicks. Return true as long as you want to track the pen/mouse. */ virtual bool onClick(Click*); virtual void onDrawBackground(SkCanvas*); virtual void onDrawContent(SkCanvas*) = 0; virtual bool onAnimate(double /*nanos*/) { return false; } virtual void onOnceBeforeDraw() {} private: std::unique_ptr fClick; SkColor fBGColor; SkScalar fWidth, fHeight; bool fHaveCalledOnceBeforeDraw; Sample(const Sample&) = delete; Sample& operator=(const Sample&) = delete; }; #endif