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49 lines
1.0 KiB
Go
49 lines
1.0 KiB
Go
// SPDX-License-Identifier: Unlicense OR MIT
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/*
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Package event contains the types for event handling.
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The Queue interface is the protocol for receiving external events.
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For example:
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var queue event.Queue = ...
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for _, e := range queue.Events(h) {
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switch e.(type) {
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...
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}
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}
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In general, handlers must be declared before events become
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available. Other packages such as pointer and key provide
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the means for declaring handlers for specific event types.
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The following example declares a handler ready for key input:
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import gioui.org/io/key
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ops := new(op.Ops)
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var h *Handler = ...
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key.InputOp{Tag: h}.Add(ops)
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*/
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package event
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// Queue maps an event handler key to the events
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// available to the handler.
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type Queue interface {
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// Events returns the available events for an
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// event handler tag.
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Events(t Tag) []Event
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}
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// Tag is the stable identifier for an event handler.
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// For a handler h, the tag is typically &h.
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type Tag interface{}
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// Event is the marker interface for events.
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type Event interface {
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ImplementsEvent()
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}
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