fix #12358 [HDPI] The "document" text in the “Generating Previews” dialog is truncated at >200% DPI

src/System.Windows.Forms/src/System/Windows/Forms/Controls/Labels/FocusableLabel.cs

@@ -0,0 +1,59 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using System.Drawing;
+
+namespace System.Windows.Forms;
+
+internal class FocusableLabel : Label
+{
+    public bool UnderlineWhenFocused { get; set; } = true;
+
+    public FocusableLabel()
+    {
+        SetStyle(ControlStyles.Selectable, true);
+        TabStop = true;
+    }
+
+    protected override CreateParams CreateParams
+    {
+        get
+        {
+            CreateParams createParams = base.CreateParams;
+            createParams.ClassName = null;
+            return createParams;
+        }
+    }
+
+    protected override void OnClick(EventArgs e)
+    {
+        base.OnClick(e);
+
+        if (UnderlineWhenFocused)
+        {
+            Focus();
+        }
+    }
+
+    protected override void OnGotFocus(EventArgs e)
+    {
+        if (UnderlineWhenFocused)
+        {
+            Font = new Font(Font, FontStyle.Underline);
+        }
+
+        base.OnGotFocus(e);
+    }
+
+    protected override void OnLostFocus(EventArgs e)
+    {
+        if (UnderlineWhenFocused)
+        {
+            Font = new Font(Font, FontStyle.Regular);
+        }
+
+        base.OnLostFocus(e);
+    }
+
+    internal override bool SupportsUiaProviders => false;
+}

src/System.Windows.Forms/src/System/Windows/Forms/Printing/PrintControllerWithStatusDialog.BackgroundThread.cs

@@ -87,7 +87,7 @@ private void Run()
         private void ThreadUnsafeUpdateLabel()
         {
             // "page {0} of {1}"
-            _dialog!._cancellingTextBox.Text = string.Format(
+            _dialog!._messageLabel.Text = string.Format(
                 SR.PrintControllerWithStatusDialog_NowPrinting,
                 _parent._pageNumber,
                 _parent._document?.DocumentName);

src/System.Windows.Forms/src/System/Windows/Forms/Printing/PrintControllerWithStatusDialog.StatusDialog.cs

@@ -2,16 +2,14 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 using System.Drawing;
-using Windows.Win32.System.Variant;
-using Windows.Win32.UI.Accessibility;
 
 namespace System.Windows.Forms;
 
 public partial class PrintControllerWithStatusDialog
 {
     private partial class StatusDialog : Form
     {
-        internal TextBox _cancellingTextBox;
+        internal FocusableLabel _messageLabel;
         private Button _cancelButton;
         private TableLayoutPanel? _tableLayoutPanel;
         private readonly BackgroundThread _backgroundThread;
@@ -24,7 +22,7 @@ internal StatusDialog(BackgroundThread backgroundThread, string dialogTitle)
             MinimumSize = Size;
         }
 
-        [MemberNotNull(nameof(_cancellingTextBox))]
+        [MemberNotNull(nameof(_messageLabel))]
         [MemberNotNull(nameof(_cancelButton))]
         private void InitializeComponent()
         {
@@ -34,24 +32,19 @@ private void InitializeComponent()
                 RightToLeft = RightToLeft.Yes;
             }
 
-            _cancellingTextBox = new TextBox()
+            _messageLabel = new FocusableLabel()
             {
                 AutoSize = true,
                 Location = new Point(8, 16),
-                BorderStyle = BorderStyle.None,
-                ReadOnly = true,
-                TextAlign = HorizontalAlignment.Center,
+                TextAlign = ContentAlignment.MiddleCenter,
                 Size = new Size(240, 64),
                 TabIndex = 1,
-                Anchor = AnchorStyles.None
+                Anchor = AnchorStyles.None,
             };
 
-            _cancellingTextBox.TextChanged += OnCancellingTextBoxTextChanged;
-
             _cancelButton = new Button()
             {
-                AutoSize = true,
-                Size = new Size(75, 23),
+                Size = ScaleHelper.ScaleToDpi(new Size(75, 23), ScaleHelper.InitialSystemDpi),
                 TabIndex = 0,
                 Text = SR.PrintControllerWithStatusDialog_Cancel,
                 Location = new Point(88, 88),
@@ -73,7 +66,7 @@ private void InitializeComponent()
             _tableLayoutPanel.ColumnStyles.Add(new(SizeType.Percent, 100F));
             _tableLayoutPanel.RowStyles.Add(new(SizeType.Percent, 50F));
             _tableLayoutPanel.RowStyles.Add(new(SizeType.Percent, 50F));
-            _tableLayoutPanel.Controls.Add(_cancellingTextBox, 0, 0);
+            _tableLayoutPanel.Controls.Add(_messageLabel, 0, 0);
             _tableLayoutPanel.Controls.Add(_cancelButton, 0, 1);
 
             AutoScaleDimensions = new Size(6, 13);
@@ -91,22 +84,10 @@ private void InitializeComponent()
         private void CancelClick(object? sender, EventArgs e)
         {
             _cancelButton.Enabled = false;
-            _cancellingTextBox.Text = SR.PrintControllerWithStatusDialog_Canceling;
+            _messageLabel.Text = SR.PrintControllerWithStatusDialog_Canceling;
             _backgroundThread._canceled = true;
         }
 
         protected override AccessibleObject CreateAccessibilityInstance() => new StatusDialogAccessibility(this);
-
-        private void OnCancellingTextBoxTextChanged(object? sender, EventArgs e)
-        {
-            if (!_cancellingTextBox.IsAccessibilityObjectCreated)
-            {
-                return;
-            }
-
-            using var textVariant = (VARIANT)_cancellingTextBox.Text;
-            _cancellingTextBox.AccessibilityObject?.RaiseAutomationEvent(UIA_EVENT_ID.UIA_Text_TextChangedEventId);
-            _cancellingTextBox.AccessibilityObject?.RaiseAutomationPropertyChangedEvent(UIA_PROPERTY_ID.UIA_NamePropertyId, textVariant, textVariant);
-        }
     }
 }