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[client] X11: synchronize keyboard input state

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Replay held keys after focus enters the client window.

Track modifiers and lock LEDs for cooked and grabbed raw input.

Handle external XKB indicator changes while the window stays focused.
This commit is contained in:
Geoffrey McRae
2026-08-10 17:36:21 +10:00
parent f8c4ef3360
commit 15e0cbbcc4
5 changed files with 162 additions and 83 deletions
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220
client/displayservers/X11/x11.c
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@@ -93,6 +93,10 @@ static int x11EventThread(void * unused);
static void x11XInputEvent(XGenericEventCookie *cookie);
static void x11XPresentEvent(XGenericEventCookie *cookie);
static void x11UpdateKeyboardGroup(void);
static int x11GetIndicatorIndex(const char * name);
static void emitKeyboardState(unsigned int indicators);
static void updateKeyboardState(void);
static void setFocus(bool focused);
static void x11GrabPointer(void);
static void inputPosition(void * opaque, double x, double y)
@@ -440,12 +444,16 @@ static bool x11Init(const LG_DSInitParams params)
LG_LOCK_INIT(x11.pointerLock);
atomic_init(&x11.captureActive, false);
atomic_init(&x11.pointerGrabbed, false);
x11.xValuator = -1;
x11.yValuator = -1;
x11.display = XOpenDisplay(NULL);
x11.jitRender = params.jitRender;
x11.wm = &X11WM_Default;
x11.rect = (struct Rect) {
x11.xValuator = -1;
x11.yValuator = -1;
x11.numLockIndicator = -1;
x11.capsLockIndicator = -1;
x11.scrollLockIndicator = -1;
x11.xkbEvent = -1;
x11.display = XOpenDisplay(NULL);
x11.jitRender = params.jitRender;
x11.wm = &X11WM_Default;
x11.rect = (struct Rect) {
.x = params.x,
.y = params.y,
.w = params.w,
@@ -741,6 +749,22 @@ static bool x11Init(const LG_DSInitParams params)
XDisplayKeycodes(x11.display, &x11.minKeycode, &x11.maxKeycode);
x11UpdateKeyboardGroup();
x11.numLockIndicator = x11GetIndicatorIndex("Num Lock");
x11.capsLockIndicator = x11GetIndicatorIndex("Caps Lock");
x11.scrollLockIndicator = x11GetIndicatorIndex("Scroll Lock");
int xkbOpcode;
int xkbEvent;
int xkbError;
int xkbMajor = XkbMajorVersion;
int xkbMinor = XkbMinorVersion;
if (XkbQueryExtension(x11.display, &xkbOpcode, &xkbEvent,
&xkbError, &xkbMajor, &xkbMinor))
{
x11.xkbEvent = xkbEvent;
XkbSelectEvents(x11.display, XkbUseCoreKbd,
XkbIndicatorStateNotifyMask, XkbIndicatorStateNotifyMask);
}
XIFreeDeviceInfo(devinfo);
@@ -1089,6 +1113,14 @@ static int x11EventThread(void * unused)
continue;
}
if (xe.type == x11.xkbEvent)
{
const XkbEvent * event = (const XkbEvent *)&xe;
if (event->any.xkb_type == XkbIndicatorStateNotify)
emitKeyboardState(event->indicators.state);
continue;
}
// call the clipboard handling code
if (x11CBEventThread(&xe))
continue;
@@ -1201,10 +1233,7 @@ static int x11EventThread(void * unused)
}
if (x11.ewmhHasFocusEvent && x11.input.focused != focused)
{
x11.input.focused = focused;
inputFocus(x11.input.opaque, focused);
}
setFocus(focused);
x11.fullscreen = fullscreen;
XFree(data);
@@ -1262,14 +1291,58 @@ static enum Modifiers keySymToModifier(KeySym sym)
}
}
static void updateModifiers(void)
static int x11GetIndicatorIndex(const char * name)
{
const Atom atom = XInternAtom(x11.display, name, True);
int index;
if (atom == None ||
!XkbGetNamedIndicator(x11.display, atom, &index, NULL, NULL, NULL))
return -1;
return index;
}
static bool indicatorActive(unsigned int state, int index)
{
return index >= 0 && index < XkbNumIndicators &&
(state & (UINT32_C(1) << index));
}
static void emitKeyboardState(unsigned int indicators)
{
x11InputKeyboardState(&x11.input,
x11.modifiers[MOD_CTRL_LEFT] || x11.modifiers[MOD_CTRL_RIGHT],
x11.modifiers[MOD_SHIFT_LEFT] || x11.modifiers[MOD_SHIFT_RIGHT],
x11.modifiers[MOD_ALT_LEFT] || x11.modifiers[MOD_ALT_RIGHT],
x11.modifiers[MOD_SUPER_LEFT] || x11.modifiers[MOD_SUPER_RIGHT],
false, false, false);
indicatorActive(indicators, x11.numLockIndicator),
indicatorActive(indicators, x11.capsLockIndicator),
indicatorActive(indicators, x11.scrollLockIndicator));
}
static void updateKeyboardState(void)
{
unsigned int indicators = 0;
XkbGetIndicatorState(x11.display, XkbUseCoreKbd, &indicators);
emitKeyboardState(indicators);
}
static void updateKeyState(unsigned int keycode, bool pressed)
{
const KeySym sym = XkbKeycodeToKeysym(x11.display, keycode,
atomic_load(&x11.keyboardGroup), 0);
const int modifier = keySymToModifier(sym);
if (modifier >= 0)
{
x11.modifiers[modifier] = pressed;
updateKeyboardState();
return;
}
if (pressed &&
(sym == XK_Num_Lock || sym == XK_Caps_Lock || sym == XK_Scroll_Lock))
updateKeyboardState();
}
static void x11UpdateKeyboardGroup(void)
@@ -1279,15 +1352,41 @@ static void x11UpdateKeyboardGroup(void)
atomic_store(&x11.keyboardGroup, state.group);
}
static void setFocus(bool focused, double x, double y)
static void setFocus(bool focused)
{
if (x11.input.focused == focused)
return;
uint32_t keys[256];
size_t count = 0;
if (focused)
{
x11UpdateKeyboardGroup();
x11InputFocus(&x11.input, focused, x, y, NULL, 0);
char keymap[32] = { 0 };
XQueryKeymap(x11.display, keymap);
memset(x11.modifiers, 0, sizeof(x11.modifiers));
for (int keycode = x11.minKeycode;
keycode <= x11.maxKeycode && keycode < 256; ++keycode)
{
const unsigned char keyByte = keymap[keycode / 8];
if (!(keyByte & (1U << (keycode % 8))))
continue;
keys[count++] = keycode - x11.minKeycode;
const KeySym sym = XkbKeycodeToKeysym(x11.display, keycode,
atomic_load(&x11.keyboardGroup), 0);
const int modifier = keySymToModifier(sym);
if (modifier >= 0)
x11.modifiers[modifier] = true;
}
}
x11InputFocus(&x11.input, focused, keys, count);
if (focused)
updateKeyboardState();
}
static bool x11GetKeyLabel(int sc, char * label, size_t size)
@@ -1316,7 +1415,7 @@ static void x11XInputEvent(XGenericEventCookie *cookie)
{
// if meta ungrab for move/resize
if (xie->mode == XINotifyUngrab)
setFocus(true, xie->event_x, xie->event_y);
setFocus(true);
return;
}
@@ -1330,7 +1429,7 @@ static void x11XInputEvent(XGenericEventCookie *cookie)
return;
setFocus(true, xie->event_x, xie->event_y);
setFocus(true);
return;
}
@@ -1341,7 +1440,7 @@ static void x11XInputEvent(XGenericEventCookie *cookie)
{
// if meta grab for move/resize
if (xie->mode == XINotifyGrab)
setFocus(false, xie->event_x, xie->event_y);
setFocus(false);
return;
}
@@ -1354,7 +1453,7 @@ static void x11XInputEvent(XGenericEventCookie *cookie)
xie->mode != XINotifyGrab)
return;
setFocus(false, xie->event_x, xie->event_y);
setFocus(false);
return;
}
@@ -1428,45 +1527,32 @@ static void x11XInputEvent(XGenericEventCookie *cookie)
x11InputKeyboardKey(&x11.input, device->detail, x11.minKeycode,
true, false, true, NULL);
if (!x11.xic || !app_isOverlayMode())
return;
char buffer[128];
KeySym sym;
Status status;
int count;
XKeyPressedEvent ev = {
.display = x11.display,
.window = x11.window,
.type = KeyPress,
.keycode = device->detail,
.state = device->mods.effective,
};
count = Xutf8LookupString(x11.xic, &ev, buffer, sizeof(buffer),
&sym, &status);
if (status == XBufferOverflow || count >= sizeof(buffer))
if (x11.xic && app_isOverlayMode())
{
DEBUG_WARN("Typing too many characters at once, ignoring");
return;
}
char buffer[128];
KeySym sym;
Status status;
XKeyPressedEvent ev = {
.display = x11.display,
.window = x11.window,
.type = KeyPress,
.keycode = device->detail,
.state = device->mods.effective,
};
if (status == XLookupChars || status == XLookupBoth)
{
buffer[count] = '\0';
inputText(x11.input.opaque, buffer);
}
const int count = Xutf8LookupString(x11.xic, &ev, buffer,
sizeof(buffer), &sym, &status);
if (status == XLookupKeySym || status == XLookupBoth)
{
int modifier = keySymToModifier(sym);
if (modifier >= 0)
if (status == XBufferOverflow || count >= sizeof(buffer))
DEBUG_WARN("Typing too many characters at once, ignoring");
else if (status == XLookupChars || status == XLookupBoth)
{
x11.modifiers[modifier] = true;
updateModifiers();
buffer[count] = '\0';
inputText(x11.input.opaque, buffer);
}
}
updateKeyState(device->detail, true);
return;
}
@@ -1478,41 +1564,31 @@ static void x11XInputEvent(XGenericEventCookie *cookie)
XIDeviceEvent *device = cookie->data;
x11InputKeyboardKey(&x11.input, device->detail, x11.minKeycode,
false, false, true, NULL);
if (!x11.xic || !app_isOverlayMode())
return;
XKeyPressedEvent ev = {
.display = x11.display,
.window = x11.window,
.type = KeyRelease,
.keycode = device->detail,
.state = device->mods.effective,
};
KeySym sym = XLookupKeysym(&ev, 0);
int modifier = keySymToModifier(sym);
if (modifier >= 0)
{
x11.modifiers[modifier] = false;
updateModifiers();
}
updateKeyState(device->detail, false);
return;
}
case XI_RawKeyPress:
{
if (!x11.input.focused || !x11.keyboardGrabbed)
return;
XIRawEvent *raw = cookie->data;
x11InputKeyboardKey(&x11.input, raw->detail, x11.minKeycode,
true, true, x11.input.focused, NULL);
true, true, true, NULL);
updateKeyState(raw->detail, true);
return;
}
case XI_RawKeyRelease:
{
if (!x11.input.focused || !x11.keyboardGrabbed)
return;
XIRawEvent *raw = cookie->data;
x11InputKeyboardKey(&x11.input, raw->detail, x11.minKeycode,
false, true, x11.input.focused, NULL);
false, true, true, NULL);
updateKeyState(raw->detail, false);
return;
}