feat(x11): add XDrawer global phone controls drawer, softkey chord detection, and st/T9 scrollback

src/fcitx5-t9/src/t9.cpp

@@ -421,6 +421,8 @@ std::vector<T9Item> T9State::getItemsForKey(int keyId) const {
             makeKey("PgDn", FcitxKey_Page_Down, 117),
             makeKey("Home", FcitxKey_Home, 110),
             makeKey("End", FcitxKey_End, 115),
+            makeKey("ScrlUp", FcitxKey_Page_Up, 112, fcitx::KeyState::Shift),
+            makeKey("ScrlDn", FcitxKey_Page_Down, 117, fcitx::KeyState::Shift),
         };
       case kKey8:
         return {
@@ -894,12 +896,35 @@ void T9State::showPreview(const std::vector<T9Item>& items, int index) {
   if (total == 0) {
     return;
   }
-  constexpr int kPageSize = 7;
-  int page = index / kPageSize;
-  int start = page * kPageSize;
-  int end = std::min(start + kPageSize, total);
+  constexpr int kMaxItemsPerPage = 7;
+  std::string prefix = modePrefix() + ":";
+  size_t maxItemsWidth =
+      (kFixedPreeditChars > prefix.size() + 1)
+          ? (kFixedPreeditChars - prefix.size() - 1)
+          : 23;
 
-  std::string preedit = modePrefix() + ":";
+  int start = 0;
+  int end = 0;
+  while (start < total) {
+    size_t width = 0;
+    int count = 0;
+    end = start;
+    while (end < total && count < kMaxItemsPerPage) {
+      size_t itemWidth = items[end].label.size() + 2;
+      if (count > 0 && width + itemWidth > maxItemsWidth) {
+        break;
+      }
+      width += itemWidth;
+      ++end;
+      ++count;
+    }
+    if (index < end) {
+      break;
+    }
+    start = end;
+  }
+
+  std::string preedit = prefix;
   for (int i = start; i < end; ++i) {
     if (i == index) {
       preedit += "[";
@@ -911,7 +936,7 @@ void T9State::showPreview(const std::vector<T9Item>& items, int index) {
       preedit += " ";
     }
   }
-  if (total > kPageSize) {
+  if (start > 0 || end < total) {
     preedit += (end < total) ? ">" : "<";
   }
   if (preedit.size() < kFixedPreeditChars) {