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exp/textinput: bug fix: a virtual keybord didn't show on iOS Safari

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This change fixes the issue by processing a textarea element in a
click or touchstart event.

There is still little odd behaviors, like a keyboard is sometimes
not shown. Let's fix them later.

Updates #2898
This commit is contained in:
Hajime Hoshi 2024-02-04 14:21:16 +09:00
parent e3b54b41c2
commit 7eee3929de
1 changed files with 48 additions and 11 deletions
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59
exp/textinput/textinput_js.go
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@ -43,6 +43,7 @@ var theTextInput textInput
func (t *textInput) init() {
t.textareaElement = document.Call("createElement", "textarea")
t.textareaElement.Set("id", "ebitengine-textinput")
t.textareaElement.Set("autocapitalize", "off")
t.textareaElement.Set("spellcheck", false)
t.textareaElement.Set("translate", "no")
@ -111,6 +112,29 @@ func (t *textInput) init() {
t.trySend(true)
return nil
}))
body.Call("appendChild", t.textareaElement)
js.Global().Call("eval", `
// Process the textarea element under user-interaction events.
// This is due to an iOS Safari restriction (#2898).
let handler = (e) => {
if (window._ebitengine_textinput_x === undefined || window._ebitengine_textinput_y === undefined) {
return;
}
let textarea = document.getElementById("ebitengine-textinput");
textarea.value = '';
textarea.focus();
textarea.style.left = _ebitengine_textinput_x + 'px';
textarea.style.top = _ebitengine_textinput_y + 'px';
window._ebitengine_textinput_x = undefined;
window._ebitengine_textinput_y = undefined;
window._ebitengine_textinput_ready = true;
};
let body = window.document.body;
body.addEventListener("click", handler);
body.addEventListener("touchstart", handler);`)
// TODO: What about other events like wheel?
}
@ -119,24 +143,37 @@ func (t *textInput) Start(x, y int) (chan State, func()) {
return nil, nil
}
if js.Global().Get("_ebitengine_textinput_ready").Truthy() {
s := newSession()
t.session = s
js.Global().Get("window").Set("_ebitengine_textinput_ready", js.Undefined())
return s.ch, s.end
}
if t.session != nil {
t.session.end()
t.session = nil
}
if !body.Call("contains", t.textareaElement).Bool() {
body.Call("appendChild", t.textareaElement)
// If a textarea is focused, create a session immediately.
// A virtual keyboard should already be shown on mobile browsers.
if document.Get("activeElement").Equal(t.textareaElement) {
t.textareaElement.Set("value", "")
t.textareaElement.Call("focus")
style := t.textareaElement.Get("style")
style.Set("left", fmt.Sprintf("%dpx", x))
style.Set("top", fmt.Sprintf("%dpx", y))
s := newSession()
t.session = s
return s.ch, s.end
}
t.textareaElement.Set("value", "")
t.textareaElement.Call("focus")
style := t.textareaElement.Get("style")
style.Set("left", fmt.Sprintf("%dpx", x))
style.Set("top", fmt.Sprintf("%dpx", y))
s := newSession()
t.session = s
return s.ch, s.end
// On iOS Safari, `focus` works only in user-interaction events (#2898).
// Assuming Start is called every tick, defer the starting process to the next user-interaction event.
js.Global().Get("window").Set("_ebitengine_textinput_x", x)
js.Global().Get("window").Set("_ebitengine_textinput_y", y)
return nil, nil
}
func (t *textInput) trySend(committed bool) {