gesture

package
Version: v0.0.0-...-1efe68c Latest Latest
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Published: Aug 4, 2021 License: MIT, Unlicense Imports: 11 Imported by: 30

Documentation

Overview

Package gesture implements common pointer gestures.

Gestures accept low level pointer Events from an event Queue and detect higher level actions such as clicks and scrolling.

Index

Constants

This section is empty.

Variables

This section is empty.

Functions

This section is empty.

Types

type Axis

type Axis uint8
const (
	Horizontal Axis = iota
	Vertical
	Both
)

func (Axis) String

func (a Axis) String() string

type Click

type Click struct {
	// contains filtered or unexported fields
}

Click detects click gestures in the form of ClickEvents.

func (*Click) Add

func (c *Click) Add(ops *op.Ops)

Add the handler to the operation list to receive click events.

func (*Click) Events

func (c *Click) Events(q event.Queue) []ClickEvent

Events returns the next click event, if any.

func (*Click) Hovered

func (c *Click) Hovered() bool

Hovered returns whether a pointer is inside the area.

func (*Click) Pressed

func (c *Click) Pressed() bool

Pressed returns whether a pointer is pressing.

type ClickEvent

type ClickEvent struct {
	Type      ClickType
	Position  f32.Point
	Source    pointer.Source
	Modifiers key.Modifiers
	// NumClicks records successive clicks occurring
	// within a short duration of each other.
	NumClicks int
}

ClickEvent represent a click action, either a TypePress for the beginning of a click or a TypeClick for a completed click.

func (ClickEvent) ImplementsEvent

func (ClickEvent) ImplementsEvent()

type ClickState

type ClickState uint8

type ClickType

type ClickType uint8
const (
	// TypePress is reported for the first pointer
	// press.
	TypePress ClickType = iota
	// TypeClick is reported when a click action
	// is complete.
	TypeClick
	// TypeCancel is reported when the gesture is
	// cancelled.
	TypeCancel
)

func (ClickType) String

func (ct ClickType) String() string

type Drag

type Drag struct {
	// contains filtered or unexported fields
}

Drag detects drag gestures in the form of pointer.Drag events.

func (*Drag) Add

func (d *Drag) Add(ops *op.Ops)

Add the handler to the operation list to receive drag events.

func (*Drag) Dragging

func (d *Drag) Dragging() bool

Dragging reports whether it's currently in use.

func (*Drag) Events

func (d *Drag) Events(cfg unit.Metric, q event.Queue, axis Axis) []pointer.Event

Events returns the next drag events, if any.

type Scroll

type Scroll struct {
	// contains filtered or unexported fields
}

Scroll detects scroll gestures and reduces them to scroll distances. Scroll recognizes mouse wheel movements as well as drag and fling touch gestures.

func (*Scroll) Add

func (s *Scroll) Add(ops *op.Ops, bounds image.Rectangle)

Add the handler to the operation list to receive scroll events.

func (*Scroll) Scroll

func (s *Scroll) Scroll(cfg unit.Metric, q event.Queue, t time.Time, axis Axis) int

Scroll detects the scrolling distance from the available events and ongoing fling gestures.

func (*Scroll) State

func (s *Scroll) State() ScrollState

State reports the scroll state.

func (*Scroll) Stop

func (s *Scroll) Stop()

Stop any remaining fling movement.

type ScrollState

type ScrollState uint8
const (
	// StateIdle is the default scroll state.
	StateIdle ScrollState = iota
	// StateDrag is reported during drag gestures.
	StateDragging
	// StateFlinging is reported when a fling is
	// in progress.
	StateFlinging
)

func (ScrollState) String

func (s ScrollState) String() string

Source Files

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