ssh page opt: performance & auto exit

lib/data/res/virtual_key.dart

@@ -0,0 +1,21 @@
+import 'package:flutter/material.dart';
+import 'package:xterm/core.dart';
+
+import '../model/ssh/virtual_key.dart';
+
+var virtualKeys = [
+  VirtualKey(TerminalKey.escape, 'Esc'),
+  VirtualKey(TerminalKey.alt, 'Alt', toggleable: true),
+  VirtualKey(TerminalKey.home, 'Home'),
+  VirtualKey(TerminalKey.arrowUp, 'Up', icon: Icons.arrow_upward),
+  VirtualKey(TerminalKey.end, 'End'),
+  VirtualKey(TerminalKey.backspace, 'Backspace',
+      extFunc: VirtualKeyType.backspace, icon: Icons.backspace),
+  VirtualKey(TerminalKey.tab, 'Tab'),
+  VirtualKey(TerminalKey.control, 'Ctrl', toggleable: true),
+  VirtualKey(TerminalKey.arrowLeft, 'Left', icon: Icons.arrow_back),
+  VirtualKey(TerminalKey.arrowDown, 'Down', icon: Icons.arrow_downward),
+  VirtualKey(TerminalKey.arrowRight, 'Right', icon: Icons.arrow_forward),
+  VirtualKey(TerminalKey.none, 'IME',
+      extFunc: VirtualKeyType.toggleIME, icon: Icons.keyboard_hide),
+];