Fix hint positioning issue when "readonly" element

The issue was present for all controls once they are in "readonly" state. Special handling of the case where the element is readonly, and the hint should follow the prefix/suffix needed to be added because of the "business rule" that prefix/suffix is always visible when the element is "readonly".

Author: nicolaihenriksen

src/MaterialDesignThemes.Wpf/Converters/FloatingHintInitialHorizontalOffsetConverter.cs

@@ -19,7 +19,8 @@ public class FloatingHintInitialHorizontalOffsetConverter : IMultiValueConverter
                 PrefixSuffixVisibility suffixVisibility,
                 PrefixSuffixHintBehavior prefixHintBehavior,
                 PrefixSuffixHintBehavior suffixHintBehavior,
-                HorizontalAlignment horizontalContentAlignment
+                HorizontalAlignment horizontalContentAlignment,
+                bool isEditable,
             ])
         {
             return 0;
@@ -37,8 +38,11 @@ double GetLeftOffset()
             return prefixVisibility switch
             {
                 PrefixSuffixVisibility.WhenFocusedOrNonEmpty
-                    when prefixHintBehavior == PrefixSuffixHintBehavior.AlignWithText =>
+                    when prefixHintBehavior == PrefixSuffixHintBehavior.AlignWithText && isEditable =>
                     prefixWidth + prefixMargin.Right,
+                PrefixSuffixVisibility.WhenFocusedOrNonEmpty
+                    when prefixHintBehavior == PrefixSuffixHintBehavior.AlignWithPrefixSuffix && !isEditable =>
+                    -(prefixWidth + prefixMargin.Right),
                 PrefixSuffixVisibility.Always
                     when prefixHintBehavior == PrefixSuffixHintBehavior.AlignWithPrefixSuffix =>
                     -(prefixWidth + prefixMargin.Right),
@@ -51,8 +55,11 @@ double GetRightOffset()
             return suffixVisibility switch
             {
                 PrefixSuffixVisibility.WhenFocusedOrNonEmpty
-                    when suffixHintBehavior == PrefixSuffixHintBehavior.AlignWithText =>
+                    when suffixHintBehavior == PrefixSuffixHintBehavior.AlignWithText && isEditable =>
                     -(suffixWidth + suffixMargin.Left),
+                PrefixSuffixVisibility.WhenFocusedOrNonEmpty
+                    when suffixHintBehavior == PrefixSuffixHintBehavior.AlignWithPrefixSuffix && !isEditable =>
+                    suffixWidth + suffixMargin.Left,
                 PrefixSuffixVisibility.Always
                     when suffixHintBehavior == PrefixSuffixHintBehavior.AlignWithPrefixSuffix =>
                     suffixWidth + suffixMargin.Left,

src/MaterialDesignThemes.Wpf/Themes/MaterialDesignTheme.AutoSuggestBox.xaml

@@ -174,6 +174,7 @@
                         <Binding RelativeSource="{RelativeSource TemplatedParent}" Path="(wpf:TextFieldAssist.PrefixTextHintBehavior)" />
                         <Binding RelativeSource="{RelativeSource TemplatedParent}" Path="(wpf:TextFieldAssist.SuffixTextHintBehavior)" />
                         <Binding RelativeSource="{RelativeSource TemplatedParent}" Path="HorizontalContentAlignment" />
+                        <Binding RelativeSource="{RelativeSource TemplatedParent}" Path="IsReadOnly" Converter="{x:Static converters:InvertBooleanConverter.Instance}" />
                       </MultiBinding>
                     </wpf:SmartHint.InitialHorizontalOffset>
                     <wpf:SmartHint.Margin>

src/MaterialDesignThemes.Wpf/Themes/MaterialDesignTheme.ComboBox.xaml

@@ -416,6 +416,7 @@
                     <Binding RelativeSource="{RelativeSource TemplatedParent}" Path="(wpf:TextFieldAssist.PrefixTextHintBehavior)" />
                     <Binding RelativeSource="{RelativeSource TemplatedParent}" Path="(wpf:TextFieldAssist.SuffixTextHintBehavior)" />
                     <Binding RelativeSource="{RelativeSource TemplatedParent}" Path="HorizontalContentAlignment" />
+                    <Binding Path="IsEditable" RelativeSource="{RelativeSource TemplatedParent}" />
                   </MultiBinding>
                 </wpf:SmartHint.InitialHorizontalOffset>
                 <wpf:SmartHint.Margin>

src/MaterialDesignThemes.Wpf/Themes/MaterialDesignTheme.PasswordBox.xaml

@@ -216,6 +216,7 @@
                         <Binding RelativeSource="{RelativeSource TemplatedParent}" Path="(wpf:TextFieldAssist.PrefixTextHintBehavior)" />
                         <Binding RelativeSource="{RelativeSource TemplatedParent}" Path="(wpf:TextFieldAssist.SuffixTextHintBehavior)" />
                         <Binding RelativeSource="{RelativeSource TemplatedParent}" Path="HorizontalContentAlignment" />
+                        <Binding Source="{StaticResource TrueValue}" />
                       </MultiBinding>
                     </wpf:SmartHint.InitialHorizontalOffset>
                     <wpf:SmartHint.Margin>
@@ -831,6 +832,7 @@
                         <Binding RelativeSource="{RelativeSource TemplatedParent}" Path="(wpf:TextFieldAssist.PrefixTextHintBehavior)" />
                         <Binding RelativeSource="{RelativeSource TemplatedParent}" Path="(wpf:TextFieldAssist.SuffixTextHintBehavior)" />
                         <Binding RelativeSource="{RelativeSource TemplatedParent}" Path="HorizontalContentAlignment" />
+                        <Binding Source="{StaticResource TrueValue}" />
                       </MultiBinding>
                     </wpf:SmartHint.InitialHorizontalOffset>
                     <wpf:SmartHint.Margin>

src/MaterialDesignThemes.Wpf/Themes/MaterialDesignTheme.TextBox.xaml

@@ -212,6 +212,7 @@
                         <Binding RelativeSource="{RelativeSource TemplatedParent}" Path="(wpf:TextFieldAssist.PrefixTextHintBehavior)" />
                         <Binding RelativeSource="{RelativeSource TemplatedParent}" Path="(wpf:TextFieldAssist.SuffixTextHintBehavior)" />
                         <Binding RelativeSource="{RelativeSource TemplatedParent}" Path="HorizontalContentAlignment" />
+                        <Binding RelativeSource="{RelativeSource TemplatedParent}" Path="IsReadOnly" Converter="{x:Static converters:InvertBooleanConverter.Instance}" />
                       </MultiBinding>
                     </wpf:SmartHint.InitialHorizontalOffset>
                     <wpf:SmartHint.Margin>