Revert 15603, add InputPaneActivationRequested in TextInputMethodClient (#19225)

* revert 15603, add InputPaneActivationRequested in TextInputMethodClient

* forward ShowInputPanel call to RaiseInputPaneActivationRequested

src/Android/Avalonia.Android/Platform/Input/AndroidInputMethod.cs

@@ -72,6 +72,13 @@ namespace Avalonia.Android.Platform.Input
 
         public void SetClient(TextInputMethodClient? client)
         {
+            if(_client != null)
+            {
+                _client.SurroundingTextChanged -= _client_SurroundingTextChanged;
+                _client.SelectionChanged -= _client_SelectionChanged;
+                _client.InputPaneActivationRequested -= _client_InputPaneActivationRequested;
+            }
+
             _client = client;
 
             if (IsActive)
@@ -86,16 +93,24 @@ namespace Avalonia.Android.Platform.Input
 
                 _client.SurroundingTextChanged += _client_SurroundingTextChanged;
                 _client.SelectionChanged += _client_SelectionChanged;
+                _client.InputPaneActivationRequested += _client_InputPaneActivationRequested;
             }
             else
             {
-                _host.ClearFocus();
                 _imm.RestartInput(View);
                 _inputConnection = null;
                 _imm.HideSoftInputFromWindow(_host.WindowToken, HideSoftInputFlags.ImplicitOnly);
             }
         }
 
+        private void _client_InputPaneActivationRequested(object? sender, EventArgs e)
+        {
+            if(IsActive)
+            {
+                _imm.ShowSoftInput(_host, ShowFlags.Implicit);
+            }
+        }
+
         private void _client_SelectionChanged(object? sender, EventArgs e)
         {
             if (_inputConnection is null || _inputConnection.IsInBatchEdit || _inputConnection.IsInUpdate)

src/Avalonia.Base/Input/TextInput/TextInputMethodClient.cs

@@ -28,6 +28,11 @@ namespace Avalonia.Input.TextInput
         /// Fires when client wants to reset IME state
         /// </summary>
         public event EventHandler? ResetRequested;
+        
+        /// <summary>
+        /// Fires when client requests the input panel be opened.
+        /// </summary>
+        public event EventHandler? InputPaneActivationRequested;
 
         /// <summary>
         /// The visual that's showing the text
@@ -78,7 +83,12 @@ namespace Avalonia.Input.TextInput
             SetPreeditText(preeditText);
         }
 
-        public virtual void ShowInputPanel() { }
+        //TODO12: remove
+        [Obsolete]
+        public virtual void ShowInputPanel()
+        {
+            RaiseInputPaneActivationRequested();
+        }
         
         protected virtual void RaiseTextViewVisualChanged()
         {
@@ -99,6 +109,11 @@ namespace Avalonia.Input.TextInput
         {
             SelectionChanged?.Invoke(this, EventArgs.Empty);
         }
+
+        protected virtual void RaiseInputPaneActivationRequested()
+        {
+            InputPaneActivationRequested?.Invoke(this, EventArgs.Empty);
+        }
         
         protected virtual void RequestReset()
         {

src/Avalonia.Controls/TextBox.cs

@@ -1791,8 +1791,6 @@ namespace Avalonia.Controls
 
             if (e.Pointer.Type != PointerType.Mouse && !_isDoubleTapped)
             {
-                _imClient.ShowInputPanel();
-
                 var text = Text;
                 var clickInfo = e.GetCurrentPoint(this);
                 if (text != null && !(clickInfo.Pointer?.Captured is Border))

src/Avalonia.Controls/TextBoxTextInputMethodClient.cs

@@ -13,7 +13,6 @@ namespace Avalonia.Controls
         private TextPresenter? _presenter;
         private bool _selectionChanged;
         private bool _isInChange;
-        private ITextInputMethodImpl? _im;
 
         public override Visual TextViewVisual => _presenter!;
 
@@ -119,6 +118,7 @@ namespace Avalonia.Controls
             if (_parent != null)
             {
                 _parent.PropertyChanged -= OnParentPropertyChanged;
+                _parent.Tapped -= OnParentTapped;
             }
 
             _parent = parent;
@@ -126,11 +126,7 @@ namespace Avalonia.Controls
             if (_parent != null)
             {
                 _parent.PropertyChanged += OnParentPropertyChanged;
-                _im = (_parent.VisualRoot as ITextInputMethodRoot)?.InputMethod;
-            }
-            else
-            {
-                _im = null;
+                _parent.Tapped += OnParentTapped;
             }
 
             var oldPresenter = _presenter;
@@ -154,6 +150,11 @@ namespace Avalonia.Controls
             RaiseCursorRectangleChanged();
         }
 
+        private void OnParentTapped(object? sender, Input.TappedEventArgs e)
+        {
+            RaiseInputPaneActivationRequested();
+        }
+
         public override void SetPreeditText(string? preeditText) => SetPreeditText(preeditText, null);
 
         public override void SetPreeditText(string? preeditText, int? cursorPos)
@@ -167,17 +168,6 @@ namespace Avalonia.Controls
             _presenter.SetCurrentValue(TextPresenter.PreeditTextCursorPositionProperty, cursorPos);
         }
 
-        public override void ShowInputPanel()
-        {
-            base.ShowInputPanel();
-
-            if (_parent is { } && _im is { })
-            {
-                _im.SetOptions(TextInputOptions.FromStyledElement(_parent));
-                _im.SetClient(this);
-            }
-        }
-
         private static string GetTextLineText(TextLine textLine)
         {
             if (textLine.Length == 0)

src/Browser/Avalonia.Browser/BrowserTextInputMethod.cs

@@ -29,11 +29,13 @@ internal class BrowserTextInputMethod(
         if (_client != null)
         {
             _client.SurroundingTextChanged -= SurroundingTextChanged;
+            _client.InputPaneActivationRequested -= InputPaneActivationRequested;
         }
 
         if (client != null)
         {
             client.SurroundingTextChanged += SurroundingTextChanged;
+            client.InputPaneActivationRequested += InputPaneActivationRequested;
         }
 
         InputHelper.ClearInputElement(_inputElement);
@@ -42,8 +44,7 @@ internal class BrowserTextInputMethod(
 
         if (_client != null)
         {
-            InputHelper.ShowElement(_inputElement);
-            InputHelper.FocusElement(_inputElement);
+            ShowIme();
 
             var surroundingText = _client.SurroundingText ?? "";
             var selection = _client.Selection;
@@ -56,6 +57,20 @@ internal class BrowserTextInputMethod(
         }
     }
 
+    private void InputPaneActivationRequested(object? sender, EventArgs e)
+    {
+        if (_client != null)
+        {
+            ShowIme();
+        }
+    }
+
+    private void ShowIme()
+    {
+        InputHelper.ShowElement(_inputElement);
+        InputHelper.FocusElement(_inputElement);
+    }
+
     private void SurroundingTextChanged(object? sender, EventArgs e)
     {
         if (_client != null)

src/Tizen/Avalonia.Tizen/NuiAvaloniaViewTextEditable.cs

@@ -118,6 +118,7 @@ internal class NuiAvaloniaViewTextEditable
             client.TextViewVisualChanged += OnTextViewVisualChanged;
             client.SurroundingTextChanged += OnSurroundingTextChanged;
             client.SelectionChanged += OnClientSelectionChanged;
+            client.InputPaneActivationRequested += OnInputPaneActivationRequested;
 
             TextInput.SelectWholeText();
             OnClientSelectionChanged(this, EventArgs.Empty);
@@ -125,6 +126,12 @@ internal class NuiAvaloniaViewTextEditable
         finally { _updating = false; }
     }
 
+    private void OnInputPaneActivationRequested(object? sender, EventArgs e)
+    {
+        var inputContext = TextInput.GetInputMethodContext();
+        inputContext.ShowInputPanel();
+    }
+
     private void OnClientSelectionChanged(object? sender, EventArgs e) => InvokeUpdate(client =>
     {
         if (client.Selection.End == 0 || client.Selection.Start == client.Selection.End)
@@ -152,6 +159,7 @@ internal class NuiAvaloniaViewTextEditable
             _client!.TextViewVisualChanged -= OnTextViewVisualChanged;
             _client!.SurroundingTextChanged -= OnSurroundingTextChanged;
             _client!.SelectionChanged -= OnClientSelectionChanged;
+            _client!.InputPaneActivationRequested -= OnInputPaneActivationRequested;
         }
 
         if (Window.Instance.GetDefaultLayer().Children.Contains((View)TextInput))