Use binding for ime conversion mode

Author: VictoriousRaptor

Flow.Launcher/Converters/BoolToIMEConversionModeConverter.cs

@@ -0,0 +1,31 @@
+using System;
+using System.Globalization;
+using System.Windows.Data;
+using System.Windows.Input;
+
+namespace Flow.Launcher.Converters
+{
+    internal class BoolToIMEConversionModeConverter : IValueConverter
+    {
+        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            if (value is bool v)
+            {
+                if (v)
+                {
+                    return ImeConversionModeValues.Alphanumeric;
+                }
+                else
+                {
+                    return ImeConversionModeValues.DoNotCare;
+                }
+            }
+            return ImeConversionModeValues.DoNotCare;
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            throw new NotImplementedException();
+        }
+    }
+}

Flow.Launcher/MainWindow.xaml

@@ -9,6 +9,7 @@
     xmlns:svgc="http://sharpvectors.codeplex.com/svgc/"
     xmlns:ui="http://schemas.modernwpf.com/2019"
     xmlns:vm="clr-namespace:Flow.Launcher.ViewModel"
+    d:DataContext="{d:DesignInstance Type=vm:MainViewModel}"
     Name="FlowMainWindow"
     Title="Flow Launcher"
     MinWidth="{Binding MainWindowWidth, Mode=OneWay}"
@@ -37,6 +38,7 @@
         <converters:QuerySuggestionBoxConverter x:Key="QuerySuggestionBoxConverter" />
         <converters:BorderClipConverter x:Key="BorderClipConverter" />
         <converters:BoolToVisibilityConverter x:Key="BoolToVisibilityConverter" />
+        <converters:BoolToIMEConversionModeConverter x:Key="BoolToIMEConversionModeConverter"/>
     </Window.Resources>
     <Window.InputBindings>
         <KeyBinding Key="Escape" Command="{Binding EscCommand}" />
@@ -204,6 +206,7 @@
                                 PreviewKeyUp="QueryTextBox_KeyUp"
                                 Style="{DynamicResource QueryBoxStyle}"
                                 Text="{Binding QueryText, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
+                                InputMethod.PreferredImeConversionMode="{Binding StartWithEnglishMode, Converter={StaticResource BoolToIMEConversionModeConverter}}"
                                 Visibility="Visible">
                                 <TextBox.CommandBindings>
                                     <CommandBinding Command="ApplicationCommands.Copy" Executed="OnCopy" />

Flow.Launcher/MainWindow.xaml.cs

@@ -20,22 +20,9 @@
 using System.Windows.Media;
 using Flow.Launcher.Infrastructure.Hotkey;
 using Flow.Launcher.Plugin.SharedCommands;
-using System.Text;
-using DataObject = System.Windows.DataObject;
-using System.Diagnostics;
-using Microsoft.AspNetCore.Http;
-using System.IO;
 using System.Windows.Threading;
 using System.Windows.Data;
 using ModernWpf.Controls;
-using System.Drawing;
-using System.Windows.Forms.Design.Behavior;
-using System.Security.Cryptography;
-using System.Runtime.CompilerServices;
-using Microsoft.VisualBasic.Devices;
-using Microsoft.FSharp.Data.UnitSystems.SI.UnitNames;
-using NLog.Targets;
-using YamlDotNet.Core.Tokens;
 using Key = System.Windows.Input.Key;
 
 namespace Flow.Launcher
@@ -131,7 +118,6 @@ private void OnLoaded(object sender, RoutedEventArgs _)
                                 UpdatePosition();
                                 PreviewReset();
                                 Activate();
-                                QueryTextBox_StartEn();
                                 QueryTextBox.Focus();
                                 _settings.ActivateTimes++;
                                 if (!_viewModel.LastQuerySelected)
@@ -195,9 +181,6 @@ private void OnLoaded(object sender, RoutedEventArgs _)
                     case nameof(Settings.Language):
                         UpdateNotifyIconText();
                         break;
-                    case nameof(Settings.AlwaysStartEn):
-                        QueryTextBox_StartEn();
-                        break;
                     case nameof(Settings.Hotkey):
                         UpdateNotifyIconText();
                         break;
@@ -703,19 +686,5 @@ private void QueryTextBox_KeyUp(object sender, KeyEventArgs e)
                 be.UpdateSource();
             }
         }
-
-        private void QueryTextBox_StartEn()
-        {
-            if (_settings.AlwaysStartEn)
-            {
-                QueryTextBox.SetValue(InputMethod.PreferredImeConversionModeProperty, ImeConversionModeValues.Alphanumeric); 
-                QueryTextBox.SetValue(InputMethod.PreferredImeStateProperty, InputMethodState.Off);
-            }
-            else
-            {
-                QueryTextBox.ClearValue(InputMethod.PreferredImeConversionModeProperty);
-                QueryTextBox.ClearValue(InputMethod.PreferredImeStateProperty);
-            }
-        }
     }
 }

Flow.Launcher/ViewModel/MainViewModel.cs

@@ -71,6 +71,9 @@ public MainViewModel(Settings settings)
                     case nameof(Settings.WindowSize):
                         OnPropertyChanged(nameof(MainWindowWidth));
                         break;
+                    case nameof(Settings.AlwaysStartEn):
+                        OnPropertyChanged(nameof(StartWithEnglishMode));
+                        break;
                 }
             };
 
@@ -514,6 +517,8 @@ public double MainWindowWidth
 
         public string Image => Constant.QueryTextBoxIconImagePath;
 
+        public bool StartWithEnglishMode => Settings.AlwaysStartEn;
+
         #endregion
 
         public void Query()