app,widget: implement Editor IME support, add Android implementation

Fixes: https://todo.sr.ht/~eliasnaur/gio/116 References: https://todo.sr.ht/~eliasnaur/gio/246 Signed-off-by: Elias Naur <mail@eliasnaur.com>
2026-07-01 07:35:40 +00:00 · 2022-01-13 13:04:31 +01:00
parent c22138f5f8
commit 58cdb3e1da
16 changed files with 880 additions and 55 deletions
@@ -0,0 +1,109 @@
+// SPDX-License-Identifier: Unlicense OR MIT
+
+package app
+
+import (
+	"testing"
+
+	"gioui.org/font/gofont"
+	"gioui.org/io/key"
+	"gioui.org/io/router"
+	"gioui.org/layout"
+	"gioui.org/op"
+	"gioui.org/text"
+	"gioui.org/unit"
+	"gioui.org/widget"
+)
+
+func FuzzIME(f *testing.F) {
+	runes := []rune("Hello, 世界! 🤬 علي،الحسنب北查爾斯頓工廠的安全漏洞已")
+	f.Add([]byte("20\x0010"))
+	f.Add([]byte("80000"))
+	f.Add([]byte("2008\"80\r00"))
+	f.Add([]byte("20007900002\x02000"))
+	f.Add([]byte("20007800002\x02000"))
+	f.Add([]byte("200A02000990\x19002\x17\x0200"))
+	f.Fuzz(func(t *testing.T, cmds []byte) {
+		cache := text.NewCache(gofont.Collection())
+		e := new(widget.Editor)
+		e.Focus()
+
+		var r router.Router
+		gtx := layout.Context{Ops: new(op.Ops), Queue: &r}
+		// Layout once to register focus.
+		e.Layout(gtx, cache, text.Font{}, unit.Px(10), nil)
+		r.Frame(gtx.Ops)
+
+		var state editorState
+		const (
+			cmdReplace = iota
+			cmdSelect
+			cmdSnip
+			maxCmd
+		)
+		const cmdLen = 5
+		for len(cmds) >= cmdLen {
+			rng := key.Range{
+				Start: int(cmds[1]),
+				End:   int(cmds[2]),
+			}
+			switch cmds[0] % cmdLen {
+			case cmdReplace:
+				rstart := int(cmds[3]) % len(runes)
+				rend := int(cmds[4]) % len(runes)
+				if rstart > rend {
+					rstart, rend = rend, rstart
+				}
+				replacement := string(runes[rstart:rend])
+				state.Replace(rng, replacement)
+				r.Queue(key.EditEvent{Range: rng, Text: replacement})
+				r.Queue(key.SnippetEvent(state.Snippet.Range))
+			case cmdSelect:
+				r.Queue(key.SelectionEvent(rng))
+				runes := []rune(e.Text())
+				if rng.Start < 0 {
+					rng.Start = 0
+				}
+				if rng.End < 0 {
+					rng.End = 0
+				}
+				if rng.Start > len(runes) {
+					rng.Start = len(runes)
+				}
+				if rng.End > len(runes) {
+					rng.End = len(runes)
+				}
+				state.Selection = rng
+			case cmdSnip:
+				r.Queue(key.SnippetEvent(rng))
+				runes := []rune(e.Text())
+				if rng.Start > rng.End {
+					rng.Start, rng.End = rng.End, rng.Start
+				}
+				if rng.Start < 0 {
+					rng.Start = 0
+				}
+				if rng.End < 0 {
+					rng.End = 0
+				}
+				if rng.Start > len(runes) {
+					rng.Start = len(runes)
+				}
+				if rng.End > len(runes) {
+					rng.End = len(runes)
+				}
+				state.Snippet = key.Snippet{
+					Range: rng,
+					Text:  string(runes[rng.Start:rng.End]),
+				}
+			}
+			cmds = cmds[cmdLen:]
+			e.Layout(gtx, cache, text.Font{}, unit.Px(10), nil)
+			r.Frame(gtx.Ops)
+			newState := r.EditorState()
+			if newState != state.EditorState {
+				t.Errorf("IME state: %+v\neditor state: %+v", state.EditorState, newState)
+			}
+		}
+	})
+}