60 lines
1.6 KiB
C
60 lines
1.6 KiB
C
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/*
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* Copyright 2022 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 ClickHandlerSlide_DEFINED
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#define ClickHandlerSlide_DEFINED
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#include "tools/SkMetaData.h"
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#include "tools/viewer/Slide.h"
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/**
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* Provides a higher level abstraction for click handling than the Slide base class. A Click object
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* is is used to track the state of the mouse over time.
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*/
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class ClickHandlerSlide : public Slide {
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public:
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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 onMouse(SkScalar x, SkScalar y,
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skui::InputState clickState,
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skui::ModifierKey modifierKeys) final;
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protected:
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/**
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* Return a Click object to handle the click. onClick will be called repeatedly with the latest
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* mouse state tracked on the Click object until it returns false.
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*/
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virtual Click* onFindClickHandler(SkScalar x, SkScalar y, skui::ModifierKey modi) = 0;
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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*) = 0;
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private:
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std::unique_ptr<Click> fClick;
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};
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#endif
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