1 /* 2 * Copyright 2011 Google Inc. 3 * 4 * Use of this source code is governed by a BSD-style license that can be 5 * found in the LICENSE file. 6 */ 7 8 #ifndef SampleCode_DEFINED 9 #define SampleCode_DEFINED 10 11 #include "include/core/SkColor.h" 12 #include "include/core/SkPoint.h" 13 #include "include/core/SkRefCnt.h" 14 #include "include/core/SkString.h" 15 #include "include/private/SkMacros.h" 16 #include "tools/Registry.h" 17 #include "tools/SkMetaData.h" 18 #include "tools/skui/InputState.h" 19 #include "tools/skui/ModifierKey.h" 20 21 #include <functional> 22 23 class SkCanvas; 24 class Sample; 25 26 using SampleFactory = Sample* (*)(); 27 using SampleRegistry = sk_tools::Registry<SampleFactory>; 28 29 #define DEF_SAMPLE(code) \ 30 static Sample* SK_MACRO_APPEND_LINE(F_)() { code } \ 31 static SampleRegistry SK_MACRO_APPEND_LINE(R_)(SK_MACRO_APPEND_LINE(F_)); 32 33 /////////////////////////////////////////////////////////////////////////////// 34 35 class Sample { 36 public: Sample()37 Sample() 38 : fBGColor(SK_ColorWHITE) 39 , fWidth(0), fHeight(0) 40 , fHaveCalledOnceBeforeDraw(false) 41 {} 42 43 virtual ~Sample() = default; 44 width()45 SkScalar width() const { return fWidth; } height()46 SkScalar height() const { return fHeight; } 47 void setSize(SkScalar width, SkScalar height); setSize(const SkPoint & size)48 void setSize(const SkPoint& size) { this->setSize(size.fX, size.fY); } setWidth(SkScalar width)49 void setWidth(SkScalar width) { this->setSize(width, fHeight); } setHeight(SkScalar height)50 void setHeight(SkScalar height) { this->setSize(fWidth, height); } 51 52 /** Call this to have the view draw into the specified canvas. */ 53 virtual void draw(SkCanvas* canvas); 54 onChar(SkUnichar)55 virtual bool onChar(SkUnichar) { return false; } 56 57 // Click handling 58 class Click { 59 public: Click()60 Click() {} Click(std::function<bool (Click *)> f)61 Click(std::function<bool(Click*)> f) : fFunc(f), fHasFunc(true) {} 62 virtual ~Click() = default; 63 64 SkPoint fOrig = {0, 0}; 65 SkPoint fPrev = {0, 0}; 66 SkPoint fCurr = {0, 0}; 67 skui::InputState fState = skui::InputState::kDown; 68 skui::ModifierKey fModifierKeys = skui::ModifierKey::kNone; 69 SkMetaData fMeta; 70 71 std::function<bool(Click*)> fFunc; 72 bool fHasFunc = false; 73 }; 74 bool mouse(SkPoint point, skui::InputState clickState, skui::ModifierKey modifierKeys); 75 setBGColor(SkColor color)76 void setBGColor(SkColor color) { fBGColor = color; } animate(double nanos)77 bool animate(double nanos) { return this->onAnimate(nanos); } 78 79 virtual SkString name() = 0; 80 81 protected: 82 /** Override to be notified of size changes. Overriders must call the super class. */ 83 virtual void onSizeChange(); 84 85 /** Override this if you might handle the click */ 86 virtual Click* onFindClickHandler(SkScalar x, SkScalar y, skui::ModifierKey modi); 87 88 /** Override to track clicks. Return true as long as you want to track the pen/mouse. */ 89 virtual bool onClick(Click*); 90 91 virtual void onDrawBackground(SkCanvas*); 92 virtual void onDrawContent(SkCanvas*) = 0; onAnimate(double)93 virtual bool onAnimate(double /*nanos*/) { return false; } onOnceBeforeDraw()94 virtual void onOnceBeforeDraw() {} 95 96 private: 97 std::unique_ptr<Click> fClick; 98 SkColor fBGColor; 99 SkScalar fWidth, fHeight; 100 bool fHaveCalledOnceBeforeDraw; 101 102 Sample(const Sample&) = delete; 103 Sample& operator=(const Sample&) = delete; 104 }; 105 106 #endif 107