diff --git a/src/rime/gear/selector.cc b/src/rime/gear/selector.cc
index 5dc38e637..f45d37cdc 100644
--- a/src/rime/gear/selector.cc
+++ b/src/rime/gear/selector.cc
@@ -16,6 +16,14 @@
 
 namespace rime {
 
+// Direction of candidate list.
+using Direction = int;
+constexpr Direction kDirectionVoid = -1;
+constexpr Direction kDirectionDown = 0;
+constexpr Direction kDirectionLeft = 1;
+constexpr Direction kDirectionUp = 2;
+constexpr Direction kDirectionRight = 3;
+
 Selector::Selector(const Ticket& ticket) : Processor(ticket) {
 }
 
@@ -28,6 +36,25 @@ ProcessResult Selector::ProcessKeyEvent(const KeyEvent& key_event) {
   Segment& current_segment(ctx->composition().back());
   if (!current_segment.menu || current_segment.HasTag("raw"))
     return kNoop;
+  bool is_linear_candidate_list = ctx->get_option("_linear");
+  bool is_vertical_text = ctx->get_option("_vertical");
+  // Deprecated. equivalent to {_linear: true, _vertical: false}
+  bool is_horizontal_layout = ctx->get_option("_horizontal");
+  Direction next_candidate = kDirectionDown;
+  Direction next_page = kDirectionDown;
+  if (is_vertical_text) {
+    // +90 degrees
+    next_candidate = (next_candidate + 1) % 4;
+    next_page = (next_page + 1) % 4;
+  }
+  if (is_linear_candidate_list || is_horizontal_layout) {
+    // -90 degrees
+    next_candidate = (next_candidate + 3) % 4;
+  }
+  if (next_page == next_candidate) {
+    // this is no-op. just to clarify that arrow keys don't change page.
+    next_page = kDirectionVoid;
+  }
   int ch = key_event.keycode();
   if (ch == XK_Prior || ch == XK_KP_Prior) {
     PageUp(ctx);
@@ -38,18 +65,18 @@ ProcessResult Selector::ProcessKeyEvent(const KeyEvent& key_event) {
     return kAccepted;
   }
   if (ch == XK_Up || ch == XK_KP_Up) {
-    if (ctx->get_option("_horizontal")) {
-      PageUp(ctx);
-    } else {
+    if (next_candidate == kDirectionDown) {
       CursorUp(ctx);
+    } else if (next_page == kDirectionDown) {
+      PageUp(ctx);
     }
     return kAccepted;
   }
   if (ch == XK_Down || ch == XK_KP_Down) {
-    if (ctx->get_option("_horizontal")) {
-      PageDown(ctx);
-    } else {
+    if (next_candidate == kDirectionDown) {
       CursorDown(ctx);
+    } else if (next_page == kDirectionDown) {
+      PageDown(ctx);
     }
     return kAccepted;
   }
@@ -57,14 +84,18 @@ ProcessResult Selector::ProcessKeyEvent(const KeyEvent& key_event) {
     if (!key_event.ctrl() &&
         !key_event.shift() &&
         ctx->caret_pos() == ctx->input().length()) {
-      if (ctx->get_option("_horizontal") &&
+      if (next_candidate == kDirectionRight &&
           CursorUp(ctx)) {
         return kAccepted;
       }
-      if (ctx->get_option("_vertical")) {
+      if (next_candidate == kDirectionLeft) {
         CursorDown(ctx);
         return kAccepted;
       }
+      if (next_page == kDirectionLeft) {
+        PageDown(ctx);
+        return kAccepted;
+      }
     }
     return kNoop;
   }
@@ -72,12 +103,16 @@ ProcessResult Selector::ProcessKeyEvent(const KeyEvent& key_event) {
     if (!key_event.ctrl() &&
         !key_event.shift() &&
         ctx->caret_pos() == ctx->input().length()) {
-      if (ctx->get_option("_horizontal")) {
+      if (next_candidate == kDirectionRight) {
         CursorDown(ctx);
         return kAccepted;
       }
-      if (ctx->get_option("_vertical") &&
-          CursorUp(ctx)) {
+      if (next_candidate == kDirectionLeft) {
+        CursorUp(ctx);
+        return kAccepted;
+      }
+      if (next_page == kDirectionLeft) {
+        PageUp(ctx);
         return kAccepted;
       }
     }