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- /*
- * 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
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