mirror of
https://git.sr.ht/~eliasnaur/gio
synced 2026-07-01 07:35:40 +00:00
Dominik Honnef
b6e0376ad2
Putting a string in an interface value has to (normally) heap allocate the string header and string. However, putting the address of a local string variable in an interface value has the same effect, as this causes the local variable to escape to the heap. Signed-off-by: Dominik Honnef <dominik@honnef.co>
92 lines
2.0 KiB
Go
92 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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data := ops.Write1(&o.Internal, ops.TypeSemanticLabelLen, string(l))
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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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data := ops.Write1(&o.Internal, ops.TypeSemanticDescLen, string(d))
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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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