From 47bd4dbe2e4a576a1f02507e9a87502d99df4f52 Mon Sep 17 00:00:00 2001
From: Berke Güzel <wenekar1@gmail.com>
Date: Mon, 12 Oct 2026 22:49:52 +0300
Subject: feat(x11): implement interactive resize, window menu, IME
 caret/preedit, and advertise YASL_CAP_CSD

---
 src/x11/window.c | 82 +++++++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 81 insertions(+), 1 deletion(-)

(limited to 'src/x11')

diff --git a/src/x11/window.c b/src/x11/window.c
index f7d036f..c00a449 100644
--- a/src/x11/window.c
+++ b/src/x11/window.c
@@ -62,6 +62,10 @@ struct x11_surface {
     struct x11_surface *parent;
     bool is_popup;
     struct yasl_vector2i content_offset;
+    char *ime_preedit;
+    int ime_cursor_begin;
+    int ime_cursor_end;
+    struct yasl_rect2i ime_caret;
 };
 
 struct paste_request {
@@ -593,6 +597,8 @@ static void surface_destroy(struct yasl_surface *base)
         if (*p == s) { *p = s->next; break; }
     }
     cancel_pastes(d, s);
+    free(s->ime_preedit);
+    s->ime_preedit = NULL;
     if (s->ic) XDestroyIC(s->ic);
     if (s->shm_active) {
         XShmDetach(d->native, &s->shm_info);
@@ -1682,7 +1688,7 @@ static void display_close(struct yasl_display *base)
 static uint32_t caps(const struct yasl_display *d)
 {
     return YASL_CAP_POPUPS | YASL_CAP_DRAG | YASL_CAP_DRAG_CARRY | YASL_CAP_PLACE_WINDOW |
-        YASL_CAP_PRIMARY_SELECTION |
+        YASL_CAP_PRIMARY_SELECTION | YASL_CAP_CSD |
         (((const struct x11_display *)d)->xi2 ? YASL_CAP_TABLET : 0);
 }
 
@@ -1948,6 +1954,75 @@ static bool interactive_move(struct yasl_surface *base)
     return true;
 }
 
+static bool interactive_resize(struct yasl_surface *base, enum yasl_resize_edge edge)
+{
+    struct x11_surface *s = (struct x11_surface *)base;
+    struct x11_display *d = display_of(base);
+    Window root, child;
+    int rx, ry, x, y;
+    unsigned mask;
+    if (s->destroyed || !d->native || !XQueryPointer(d->native, s->window,
+            &root, &child, &rx, &ry, &x, &y, &mask)) return false;
+
+    int dir;
+    switch (edge) {
+    case YASL_EDGE_TOP_LEFT:     dir = 0; break;
+    case YASL_EDGE_TOP:          dir = 1; break;
+    case YASL_EDGE_TOP_RIGHT:    dir = 2; break;
+    case YASL_EDGE_RIGHT:        dir = 3; break;
+    case YASL_EDGE_BOTTOM_RIGHT: dir = 4; break;
+    case YASL_EDGE_BOTTOM:       dir = 5; break;
+    case YASL_EDGE_BOTTOM_LEFT:  dir = 6; break;
+    case YASL_EDGE_LEFT:         dir = 7; break;
+    default: return false;
+    }
+
+    XUngrabPointer(d->native, CurrentTime);
+    net_message(s, XInternAtom(d->native, "_NET_WM_MOVERESIZE", False), rx, ry, dir, 1, 1);
+    return true;
+}
+
+static bool show_window_menu(struct yasl_surface *base, struct yasl_vector2i pos)
+{
+    struct x11_surface *s = (struct x11_surface *)base;
+    struct x11_display *d = display_of(base);
+    if (s->destroyed || !d->native) return false;
+    Atom atom = XInternAtom(d->native, "_GTK_SHOW_WINDOW_MENU", False);
+    net_message(s, atom, s->window, pos.x, pos.y, 0, 0);
+    return true;
+}
+
+static void set_ime_caret(struct yasl_surface *base, struct yasl_rect2i caret)
+{
+    struct x11_surface *s = (struct x11_surface *)base;
+    if (!s) return;
+    s->ime_caret = caret;
+    if (s->ic) {
+        XPoint spot = { (short)caret.x, (short)(caret.y + caret.height) };
+        XVaNestedList preedit_attr = XVaCreateNestedList(0, XNSpotLocation, &spot, NULL);
+        if (preedit_attr) {
+            XSetICValues(s->ic, XNPreeditAttributes, preedit_attr, NULL);
+            XFree(preedit_attr);
+        }
+    }
+}
+
+static const char *ime_preedit(const struct yasl_surface *base)
+{
+    const struct x11_surface *s = (const struct x11_surface *)base;
+    return s ? s->ime_preedit : NULL;
+}
+
+static bool ime_preedit_cursor(const struct yasl_surface *base, int *begin, int *end)
+{
+    const struct x11_surface *s = (const struct x11_surface *)base;
+    if (!s || !s->ime_preedit || s->ime_cursor_begin < 0)
+        return false;
+    if (begin) *begin = s->ime_cursor_begin;
+    if (end) *end = s->ime_cursor_end;
+    return true;
+}
+
 const struct yasl_backend_ops yasl_x11_backend = {
     .type = YASL_BACKEND_X11,
     .display_open = display_open,
@@ -1978,6 +2053,11 @@ const struct yasl_backend_ops yasl_x11_backend = {
     .surface_drag_carry = drag_carry,
     .surface_place_under_pointer = place,
     .surface_start_interactive_move = interactive_move,
+    .surface_start_interactive_resize = interactive_resize,
+    .surface_show_window_menu = show_window_menu,
+    .surface_set_ime_caret = set_ime_caret,
+    .surface_ime_preedit = ime_preedit,
+    .surface_ime_preedit_cursor = ime_preedit_cursor,
     .display_get_native_handle = native_display,
     .surface_get_native_handle = native_surface,
 };
-- 
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