ClickHandlerSlide Class Reference

#include <ClickHandlerSlide.h>

Inheritance diagram for ClickHandlerSlide:

Classes
class	Click

Public Member Functions
bool	onMouse (SkScalar x, SkScalar y, skui::InputState clickState, skui::ModifierKey modifierKeys) final
Public Member Functions inherited from Slide
virtual SkISize	getDimensions () const
virtual void	gpuTeardown ()
virtual void	draw (SkCanvas *canvas)=0
virtual bool	animate (double nanos)
virtual void	load (SkScalar winWidth, SkScalar winHeight)
virtual void	resize (SkScalar winWidth, SkScalar winHeight)
virtual void	unload ()
virtual bool	onChar (SkUnichar c)
virtual bool	onMouse (SkScalar x, SkScalar y, skui::InputState state, skui::ModifierKey modifiers)
virtual bool	onGetControls (SkMetaData *)
virtual void	onSetControls (const SkMetaData &)
const SkString &	getName ()
Public Member Functions inherited from SkRefCntBase
	SkRefCntBase ()
virtual	~SkRefCntBase ()
bool	unique () const
void	ref () const
void	unref () const

Protected Member Functions
virtual Click *	onFindClickHandler (SkScalar x, SkScalar y, skui::ModifierKey modi)=0
virtual bool	onClick (Click *)=0

Additional Inherited Members
Protected Attributes inherited from Slide
SkString	fName

Detailed Description

Provides a higher level abstraction for click handling than the Slide base class. A Click object is is used to track the state of the mouse over time.

Definition at line 22 of file ClickHandlerSlide.h.

Member Function Documentation

onClick()

virtual bool ClickHandlerSlide::onClick ( Click *  )

protectedpure virtual

Override to track clicks. Return true as long as you want to track the pen/mouse.

Implemented in CubeBaseSlide, HalfPlaneSlide, HalfPlaneSlide2, DrawLineSlide, BackdropSlide, MixerSlide, EdgeClipSlide, QuadStrokerSlide, SGSlide, XferSlide, AudioSlide, PathClipSlide, PathSlide, ArcToSlide, FatStrokeSlide, CubicCurveSlide, CubicCurve2Slide, SimpleStrokerSlide, SlidesSlide, StringArtSlide, VariableWidthStrokerSlide, and CubicResamplerSlide.

onFindClickHandler()

virtual Click * ClickHandlerSlide::onFindClickHandler ( SkScalar  x, SkScalar  y, skui::ModifierKey  modi  )

protectedpure virtual

Return a Click object to handle the click. onClick will be called repeatedly with the latest mouse state tracked on the Click object until it returns false.

Implemented in CubeBaseSlide, HalfPlaneSlide, HalfPlaneSlide2, DrawLineSlide, BackdropSlide, PathSlide, ArcToSlide, FatStrokeSlide, CubicCurveSlide, CubicCurve2Slide, QuadStrokerSlide, SGSlide, SimpleStrokerSlide, VariableWidthStrokerSlide, AudioSlide, DegenerateQuadSlide, SampleFitCubicToCircle, GraphitePrimitivesSlide, MixerSlide, PathClipSlide, EdgeClipSlide, SlidesSlide, StringArtSlide, XferSlide, and CubicResamplerSlide.

onMouse()

bool ClickHandlerSlide::onMouse ( SkScalar  x, SkScalar  y, skui::InputState  clickState, skui::ModifierKey  modifierKeys  )

finalvirtual

Reimplemented from Slide.

Definition at line 10 of file ClickHandlerSlide.cpp.

                                                              {
    auto dispatch = [this](Click* c) {
        return c->fHasFunc ? c->fFunc(c) : this->onClick(c);
    };
 
    switch (clickState) {
        case skui::InputState::kDown:
            fClick = nullptr;
            fClick.reset(this->onFindClickHandler(x, y, modifierKeys));
            if (!fClick) {
                return false;
            }
            fClick->fPrev = fClick->fCurr = fClick->fOrig = {x, y};
            fClick->fState = skui::InputState::kDown;
            fClick->fModifierKeys = modifierKeys;
            dispatch(fClick.get());
            return true;
        case skui::InputState::kMove:
            if (fClick) {
                fClick->fPrev = fClick->fCurr;
                fClick->fCurr = {x, y};
                fClick->fState = skui::InputState::kMove;
                fClick->fModifierKeys = modifierKeys;
                return dispatch(fClick.get());
            }
            return false;
        case skui::InputState::kUp:
            if (fClick) {
                fClick->fPrev = fClick->fCurr;
                fClick->fCurr = {x, y};
                fClick->fState = skui::InputState::kUp;
                fClick->fModifierKeys = modifierKeys;
                bool result = dispatch(fClick.get());
                fClick = nullptr;
                return result;
            }
            return false;
        default:
            // Ignore other cases
            SK_ABORT("Unexepected InputState");
    }
 
    SkUNREACHABLE;
}

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The documentation for this class was generated from the following files:

• third_party/skia/tools/viewer/ClickHandlerSlide.h
• third_party/skia/tools/viewer/ClickHandlerSlide.cpp