mirror of
https://git.sr.ht/~eliasnaur/gio
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Elias Naur
8a90074d04
Software such as screen readers require semantic descriptions of user interfaces to effectively present and interact with them. Package semantic, combined with the existing package clip provide the operations for Gio programs to describe themselves. This change implements the semantic package and the routing changes for accessing semantic trees; follow-ups add semantic information to widgets and implement mapping semantic tree to platform representations. Signed-off-by: Elias Naur <mail@eliasnaur.com>
94 lines
2.0 KiB
Go
94 lines
2.0 KiB
Go
// SPDX-License-Identifier: Unlicense OR MIT
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// Package semantic provides operations for semantic descriptions of a user
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// interface, to facilitate presentation and interaction in external software
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// such as screen readers.
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//
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// Semantic descriptions are organized in a tree, with clip operations as
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// nodes. Operations in this package are associated with the current semantic
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// node, that is the most recent pushed clip operation.
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package semantic
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import (
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"gioui.org/internal/ops"
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"gioui.org/op"
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)
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// LabelOp provides the content of a textual component.
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type LabelOp string
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// DescriptionOp describes a component.
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type DescriptionOp string
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// ClassOp provides the component class.
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type ClassOp int
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const (
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Unknown ClassOp = iota
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Button
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CheckBox
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Editor
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RadioButton
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Switch
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)
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// SelectedOp describes the selected state for components that have
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// boolean state.
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type SelectedOp bool
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// DisabledOp describes the disabled state.
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type DisabledOp bool
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func (l LabelOp) Add(o *op.Ops) {
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s := string(l)
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data := ops.Write1(&o.Internal, ops.TypeSemanticLabelLen, &s)
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data[0] = byte(ops.TypeSemanticLabel)
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}
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func (d DescriptionOp) Add(o *op.Ops) {
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s := string(d)
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data := ops.Write1(&o.Internal, ops.TypeSemanticDescLen, &s)
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data[0] = byte(ops.TypeSemanticDesc)
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}
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func (c ClassOp) Add(o *op.Ops) {
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data := ops.Write(&o.Internal, ops.TypeSemanticClassLen)
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data[0] = byte(ops.TypeSemanticClass)
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data[1] = byte(c)
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}
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func (s SelectedOp) Add(o *op.Ops) {
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data := ops.Write(&o.Internal, ops.TypeSemanticSelectedLen)
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data[0] = byte(ops.TypeSemanticSelected)
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if s {
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data[1] = 1
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}
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}
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func (d DisabledOp) Add(o *op.Ops) {
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data := ops.Write(&o.Internal, ops.TypeSemanticDisabledLen)
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data[0] = byte(ops.TypeSemanticDisabled)
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if d {
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data[1] = 1
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}
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}
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func (c ClassOp) String() string {
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switch c {
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case Unknown:
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return "Unknown"
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case Button:
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return "Button"
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case CheckBox:
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return "CheckBox"
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case Editor:
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return "Editor"
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case RadioButton:
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return "RadioButton"
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case Switch:
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return "Switch"
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default:
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panic("invalid ClassOp")
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}
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}
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