perf: add keydown to textbox

STranslate/View/SettingsWindow.xaml

@@ -139,25 +139,16 @@
                                    Grid.Row="1"
                                    Grid.Column="0"
                                    Margin="0,5,0,0" />
-                        <TextBox x:Name="CrossWord_TextBox"
-                                 Cursor="Arrow"
+                            <TextBox Cursor="Arrow"
                                      Width="200"
                                      Grid.Row="1"
                                      Grid.Column="1"
                                      Margin="0,5,0,0"
                                      CaretBrush="Transparent"
                                      VerticalContentAlignment="Center"
-                                 InputMethod.IsInputMethodEnabled="False">
-                            <i:Interaction.Triggers>
-                                <i:EventTrigger EventName="PreviewKeyDown">
-                                    <i:InvokeCommandAction Command="{Binding PreviewKeyDownCmd}"
-                                                            CommandParameter="{Binding ElementName=CrossWord_TextBox}"/>
-                                </i:EventTrigger>
-                                <i:EventTrigger EventName="KeyUp">
-                                    <i:InvokeCommandAction Command="{Binding CrossWordKeyUpCmd}"/>
-                                </i:EventTrigger>
-                            </i:Interaction.Triggers>
-                        </TextBox>
+                                     InputMethod.IsInputMethodEnabled="False"
+                                     PreviewKeyDown="HotKeyTextBox_PreviewKeyDown"
+                                     KeyUp="CrossWord_KeyUp"/>
                             <Label Grid.Row="1"
                                    Grid.Column="2"
                                    Margin="0,5,0,0"

STranslate/View/SettingsWindow.xaml.cs

@@ -29,5 +29,55 @@ namespace STranslate.View
 
             DataContext = ViewModel.SettingsVM.Instance;
         }
+
+        private byte _hotkeysModifiers;
+        private int _hotkeysKey;
+        private string _hotkeysText = string.Empty;
+
+        private void HotKeyTextBox_PreviewKeyDown(object sender, KeyEventArgs e)
+        {
+            e.Handled = true;
+            _hotkeysModifiers = 0;
+            _hotkeysKey = 0;
+            _hotkeysText = "";
+            Key key = (e.Key == Key.System ? e.SystemKey : e.Key);
+            if (key == Key.LeftShift || key == Key.RightShift
+                || key == Key.LeftCtrl || key == Key.RightCtrl
+                || key == Key.LeftAlt || key == Key.RightAlt
+                || key == Key.LWin || key == Key.RWin)
+            {
+                return;
+            }
+            StringBuilder shortcutText = new StringBuilder();
+            if ((Keyboard.Modifiers & ModifierKeys.Control) != 0)
+            {
+                _hotkeysModifiers += 2;
+                shortcutText.Append("Ctrl + ");
+            }
+            if ((Keyboard.Modifiers & ModifierKeys.Shift) != 0)
+            {
+                _hotkeysModifiers += 4;
+                shortcutText.Append("Shift + ");
+            }
+            if ((Keyboard.Modifiers & ModifierKeys.Alt) != 0)
+            {
+                _hotkeysModifiers += 1;
+                shortcutText.Append("Alt + ");
+            }
+            if (_hotkeysModifiers == 0 && (key < Key.F1 || key > Key.F12))
+            {
+                _hotkeysKey = 0;
+                shortcutText.Clear();
+                ((System.Windows.Controls.TextBox)sender).Text = _hotkeysText = "";
+                return;
+            }
+            _hotkeysKey = KeyInterop.VirtualKeyFromKey(key);
+            shortcutText.Append(key.ToString());
+            ((System.Windows.Controls.TextBox)sender).Text = _hotkeysText = shortcutText.ToString();
+        }
+        private void CrossWord_KeyUp(object sender, KeyEventArgs e)
+        {
+
+        }
     }
 }

STranslate/ViewModel/SettingsVM.cs

@@ -91,16 +91,6 @@ namespace STranslate.ViewModel
                       MessageBox.Show($"未找到默认应用\n{ex.Message}");
                   }
               });
-
-            PreviewKeyDownCmd = new RelayCommand((_) => true, (o) =>
-            {
-                System.Diagnostics.Debug.Print($"Press key, control: {o}");
-            });
-
-            CrossWordKeyUpCmd = new RelayCommand((_) => true, (_) =>
-            {
-                System.Diagnostics.Debug.Print($"Key up");
-            });
         }
 
 
@@ -125,11 +115,6 @@ namespace STranslate.ViewModel
         public ICommand StartupCmd { get; private set; }
         public ICommand EscCmd { get; private set; }
         public ICommand ResetHotKeysCmd { get; private set; }
-        /// <summary>
-        /// 按键按下事件
-        /// </summary>
-        public ICommand PreviewKeyDownCmd { get; private set; }
-        public ICommand CrossWordKeyUpCmd { get; private set; }
 
 
         private static SettingsVM _instance;