Improved hex viewer and new memory viewer

Directory.Packages.props

@@ -36,6 +36,7 @@
     <PackageVersion Include="SkiaSharp" Version="3.116.1" />
     <PackageVersion Include="SkiaSharp.NativeAssets.Linux" Version="3.116.1" />
     <PackageVersion Include="System.CommandLine" Version="2.0.2" />
+    <PackageVersion Include="System.Reactive" Version="6.1.0" />
     <PackageVersion Include="System.Text.Json" Version="10.0.0" />
     <PackageVersion Include="xunit.runner.visualstudio" Version="3.1.5" />
     <PackageVersion Include="xunit.v3" Version="3.2.2" />

src/Spectron.Debugger/Breakpoints/BreakpointHandler.cs

@@ -69,7 +69,7 @@ private void BeforeInstruction(Word pc)
         BreakpointHit?.Invoke(this, new BreakpointHitEventArgs(_previousAddress));
     }
 
-    private void MemoryOnMemoryUpdated(Word address)
+    private void MemoryOnMemoryUpdated(Word address, byte value)
     {
         IsBreakpointHit = BreakpointManager.IsMemoryBreakpointHit(address, _emulator.Memory);
 

src/Spectron.Debugger/Controls/Hex/DefaultAsciiFormatter.cs

@@ -0,0 +1,6 @@
+namespace OldBit.Spectron.Debugger.Controls.Hex;
+
+public sealed class DefaultAsciiFormatter : IAsciiFormatter
+{
+    public char Format(byte b) => b is >= 32 and <= 126 ? (char)b : '.';
+}

src/Spectron.Debugger/Controls/Hex/HexCellClickedEventArgs.cs

@@ -0,0 +1,10 @@
+namespace OldBit.Spectron.Debugger.Controls.Hex;
+
+internal sealed class HexCellClickedEventArgs(int rowIndex, int position, bool isShiftPressed) : EventArgs
+{
+    internal int Position { get; } = position;
+
+    internal int RowIndex { get; } = rowIndex;
+
+    internal bool IsShiftPressed { get; } = isShiftPressed;
+}

src/Spectron.Debugger/Controls/Hex/HexViewer.axaml

@@ -0,0 +1,27 @@
+<Styles xmlns="https://github.com/avaloniaui"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:hex="clr-namespace:OldBit.Spectron.Debugger.Controls.Hex">
+    <Styles.Resources>
+        <ResourceDictionary>
+            <ResourceDictionary.ThemeDictionaries>
+                <ResourceDictionary x:Key="Dark"/>
+                <ResourceDictionary x:Key="Default"/>
+            </ResourceDictionary.ThemeDictionaries>
+        </ResourceDictionary>
+    </Styles.Resources>
+
+    <Style Selector="hex|HexViewer">
+        <Setter Property="Foreground" Value="{DynamicResource SystemBaseMediumHighColor}"/>
+        <Setter Property="FontFamily" Value="Menlo, Consolas, Courier New, DejaVu Sans Mono"/>
+        <Setter Property="FontSize" Value="14"/>
+    </Style>
+
+    <Style Selector="hex|HexViewerRow">
+        <Setter Property="SelectedBackground" Value="{DynamicResource SystemAccentColor}"/>
+        <Setter Property="OffsetForeground" Value="{DynamicResource SystemAccentColor}"/>
+    </Style>
+
+    <Style Selector="hex|HexViewerHeader">
+        <Setter Property="Foreground" Value="{DynamicResource SystemAccentColor}"/>
+    </Style>
+</Styles>