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