3a85ed12bf
Change-Id: Idb5dfe57a7f6e3d6078ab1e68d542b084114cfbe Reviewed-on: https://skia-review.googlesource.com/c/skia/+/225735 Commit-Queue: Hal Canary <halcanary@google.com> Reviewed-by: Ben Wagner <bungeman@google.com>
107 lines
3.2 KiB
C++
107 lines
3.2 KiB
C++
/*
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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 "src/utils/SkMetaData.h"
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#include "tools/ModifierKey.h"
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#include "tools/Registry.h"
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class AnimTimer;
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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 : public SkRefCnt {
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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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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(Sample* target);
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virtual ~Click();
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enum State {
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kDown_State,
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kMoved_State,
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kUp_State
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};
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SkPoint fOrig, fPrev, fCurr;
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SkIPoint fIOrig, fIPrev, fICurr;
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State fState;
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ModifierKey fModifierKeys = ModifierKey::kNone;
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SkMetaData fMeta;
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private:
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sk_sp<Sample> fTarget;
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friend class Sample;
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};
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Click* findClickHandler(SkScalar x, SkScalar y, ModifierKey modifierKeys);
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static void DoClickDown(Click*, int x, int y, ModifierKey modi);
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static void DoClickMoved(Click*, int x, int y, ModifierKey modi);
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static void DoClickUp(Click*, int x, int y, ModifierKey modi);
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void setBGColor(SkColor color) { fBGColor = color; }
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bool animate(const AnimTimer& timer) { return this->onAnimate(timer); }
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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, 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(const AnimTimer&) { return false; }
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virtual void onOnceBeforeDraw() {}
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private:
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SkColor fBGColor;
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SkScalar fWidth, fHeight;
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bool fHaveCalledOnceBeforeDraw;
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};
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#endif
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