fixed #827

src/Shared/HandyControlDemo_Shared/UserControl/Styles/TextBlockDemoCtl.xaml

@@ -43,7 +43,7 @@
                 <TextBlock HorizontalAlignment="Left" Margin="5" Text="{ex:Lang Key={x:Static langs:LangKeys.Text},Converter={StaticResource StringRepeatConverter},ConverterParameter=20}" Style="{StaticResource TextBlockDefaultDanger}"/>
                 <TextBlock HorizontalAlignment="Left" Margin="5" Text="{ex:Lang Key={x:Static langs:LangKeys.Text},Converter={StaticResource StringRepeatConverter},ConverterParameter=20}" Style="{StaticResource TextBlockDefaultWarning}"/>
                 <TextBlock HorizontalAlignment="Left" Margin="5" Text="{ex:Lang Key={x:Static langs:LangKeys.Text},Converter={StaticResource StringRepeatConverter},ConverterParameter=20}" Style="{StaticResource TextBlockDefaultInfo}"/>
-                <TextBlock hc:TextBlockAttach.AutoTooltip="True" Width="300" HorizontalAlignment="Left" Margin="5" Text="{ex:Lang Key={x:Static langs:LangKeys.Text},Converter={StaticResource StringRepeatConverter},ConverterParameter=20}" Style="{StaticResource TextBlockDefaultSuccess}"/>
+                <TextBlock hc:TextBlockAttach.AutoTooltip="True" TextTrimming="CharacterEllipsis" Width="300" HorizontalAlignment="Left" Margin="5" Text="{ex:Lang Key={x:Static langs:LangKeys.Text},Converter={StaticResource StringRepeatConverter},ConverterParameter=20}" Style="{StaticResource TextBlockDefaultSuccess}"/>
             </StackPanel>
         </StackPanel>
     </hc:TransitioningContentControl>

src/Shared/HandyControl_Shared/Controls/Attach/TextBlockAttach.cs

@@ -1,6 +1,8 @@
 using System.Windows;
 using System.Windows.Controls;
+using System.Windows.Media;
 using HandyControl.Data;
+using HandyControl.Tools.Helper;
 
 namespace HandyControl.Controls
 {
@@ -15,13 +17,11 @@ namespace HandyControl.Controls
             {
                 if ((bool) e.NewValue)
                 {
-                    ctl.TextTrimming = TextTrimming.WordEllipsis;
                     UpdateTooltip(ctl);
                     ctl.SizeChanged += TextBlock_SizeChanged;
                 }
                 else
                 {
-                    ctl.ClearValue(TextBlock.TextTrimmingProperty);
                     ctl.SizeChanged -= TextBlock_SizeChanged;
                 }
             }
@@ -46,8 +46,23 @@ namespace HandyControl.Controls
             textBlock.Measure(new Size(double.PositiveInfinity, double.PositiveInfinity));
             var width = textBlock.DesiredSize.Width - textBlock.Margin.Left - textBlock.Margin.Right;
 
-            ToolTipService.SetToolTip(textBlock,
-                textBlock.RenderSize.Width > width || textBlock.ActualWidth < width ? textBlock.Text : null);
+            if(textBlock.RenderSize.Width > width || textBlock.ActualWidth < width || CalcTextWidth(textBlock) > width)
+            {
+                ToolTipService.SetToolTip(textBlock, textBlock.Text);
+            }
+            else
+            {
+                ToolTipService.SetToolTip(textBlock, null);
+            }
+        }
+
+        private static double CalcTextWidth(TextBlock textBlock)
+        {
+            var formattedText = TextHelper.CreateFormattedText(textBlock.Text, textBlock.FlowDirection,
+                new Typeface(textBlock.FontFamily, textBlock.FontStyle, textBlock.FontWeight, textBlock.FontStretch),
+                textBlock.FontSize);
+
+            return formattedText.WidthIncludingTrailingWhitespace;
         }
     }
 }

src/Shared/HandyControl_Shared/Controls/Text/OutlineText.cs

@@ -1,10 +1,10 @@
 using System;
 using System.ComponentModel;
-using System.Globalization;
 using System.Windows;
 using System.Windows.Documents;
 using System.Windows.Media;
 using HandyControl.Data;
+using HandyControl.Tools.Helper;
 
 namespace HandyControl.Controls
 {
@@ -201,27 +201,8 @@ namespace HandyControl.Controls
                 return;
             }
 
-#if NET40 || NET45 || NET451 || NET452 || NET46|| NET461
-            _formattedText = new FormattedText(
-                Text,
-                CultureInfo.CurrentUICulture,
-                FlowDirection,
-                new Typeface(FontFamily, FontStyle, FontWeight, FontStretch),
-                FontSize, Fill);
-#else
-            var source = PresentationSource.FromVisual(this);
-            var dpi = 1.0;
-            if (source?.CompositionTarget != null)
-            {
-                dpi = 96.0 * source.CompositionTarget.TransformToDevice.M11 / 96.0;
-            }
-            _formattedText = new FormattedText(
-                Text,
-                CultureInfo.CurrentUICulture,
-                FlowDirection,
-                new Typeface(FontFamily, FontStyle, FontWeight, FontStretch),
-                FontSize, Fill, dpi);
-#endif
+            _formattedText = TextHelper.CreateFormattedText(Text, FlowDirection,
+                new Typeface(FontFamily, FontStyle, FontWeight, FontStretch), FontSize);
 
             UpdateFormattedText();
         }

src/Shared/HandyControl_Shared/Controls/Text/SimpleText.cs

@@ -1,10 +1,10 @@
 using System;
 using System.ComponentModel;
-using System.Globalization;
 using System.Windows;
 using System.Windows.Documents;
 using System.Windows.Media;
 using HandyControl.Data;
+using HandyControl.Tools.Helper;
 
 namespace HandyControl.Controls
 {
@@ -129,27 +129,8 @@ namespace HandyControl.Controls
                 return;
             }
 
-#if NET40 || NET45 || NET451 || NET452 || NET46|| NET461
-            _formattedText = new FormattedText(
-                Text,
-                CultureInfo.CurrentUICulture,
-                FlowDirection,
-                new Typeface(FontFamily, FontStyle, FontWeight, FontStretch),
-                FontSize, Foreground);
-#else
-            var source = PresentationSource.FromVisual(this);
-            var dpi = 1.0;
-            if (source?.CompositionTarget != null)
-            {
-                dpi = 96.0 * source.CompositionTarget.TransformToDevice.M11 / 96.0;
-            }
-            _formattedText = new FormattedText(
-                Text,
-                CultureInfo.CurrentUICulture,
-                FlowDirection,
-                new Typeface(FontFamily, FontStyle, FontWeight, FontStretch),
-                FontSize, Foreground, dpi);
-#endif
+            _formattedText = TextHelper.CreateFormattedText(Text, FlowDirection,
+                new Typeface(FontFamily, FontStyle, FontWeight, FontStretch), FontSize);
 
             UpdateFormattedText();
         }

src/Shared/HandyControl_Shared/HandyControl_Shared.projitems

@@ -372,6 +372,7 @@
     <Compile Include="$(MSBuildThisFileDirectory)Tools\Helper\ScreenHelper.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Tools\Helper\SecurityHelper.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Tools\Helper\SingleOpenHelper.cs" />
+    <Compile Include="$(MSBuildThisFileDirectory)Tools\Helper\TextHelper.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Tools\Helper\TokenizerHelper.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Tools\Helper\TouchDragMoveWindowHelper.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Tools\Helper\ValidateHelper.cs" />

src/Shared/HandyControl_Shared/Tools/Helper/TextHelper.cs

@@ -0,0 +1,30 @@
+using System.Globalization;
+using System.Windows;
+using System.Windows.Media;
+
+namespace HandyControl.Tools.Helper
+{
+    internal class TextHelper
+    {
+        public static FormattedText CreateFormattedText(string text, FlowDirection flowDirection, Typeface typeface, double fontSize)
+        {
+#if NET40 || NET45 || NET451 || NET452 || NET46 || NET461
+            var formattedText = new FormattedText(
+                text,
+                CultureInfo.CurrentUICulture,
+                flowDirection,
+                typeface,
+                fontSize, Brushes.Black);
+#else
+            var formattedText = new FormattedText(
+                text,
+                CultureInfo.CurrentUICulture,
+                flowDirection,
+                typeface,
+                fontSize, Brushes.Black, DpiHelper.DeviceDpiX);
+#endif
+
+            return formattedText;
+        }
+    }
+}