| /* |
| * 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<SampleFactory>; |
| |
| #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<Click> fClick; |
| SkColor fBGColor; |
| SkScalar fWidth, fHeight; |
| bool fHaveCalledOnceBeforeDraw; |
| |
| Sample(const Sample&) = delete; |
| Sample& operator=(const Sample&) = delete; |
| }; |
| |
| #endif |