Port stock market from Delta-V

Content.Client/_DV/CartridgeLoader/Cartridges/PriceHistoryTable.xaml

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+<cartridges:PriceHistoryTable
+    xmlns="https://spacestation14.io"
+    xmlns:cartridges="clr-namespace:Content.Client._DV.CartridgeLoader.Cartridges"
+    Orientation="Vertical"
+    HorizontalExpand="True"
+    Margin="0,5,0,0">
+
+    <!-- Header -->
+    <BoxContainer Orientation="Horizontal" HorizontalExpand="True">
+        <Label Text="{Loc stock-trading-price-history}"
+               HorizontalExpand="True"
+               StyleClasses="LabelSubText" />
+    </BoxContainer>
+
+    <!-- Price history panel -->
+    <PanelContainer Name="HistoryPanel"
+                    HorizontalExpand="True"
+                    Margin="0,2,0,0">
+        <BoxContainer Orientation="Horizontal"
+                      HorizontalExpand="True"
+                      HorizontalAlignment="Center">
+            <GridContainer Name="PriceGrid" Columns="5" />
+        </BoxContainer>
+    </PanelContainer>
+</cartridges:PriceHistoryTable>

Content.Client/_DV/CartridgeLoader/Cartridges/PriceHistoryTable.xaml.cs

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+using System.Linq;
+using Robust.Client.AutoGenerated;
+using Robust.Client.Graphics;
+using Robust.Client.UserInterface.Controls;
+using Robust.Client.UserInterface.XAML;
+
+namespace Content.Client._DV.CartridgeLoader.Cartridges;
+
+[GenerateTypedNameReferences]
+public sealed partial class PriceHistoryTable : BoxContainer
+{
+    public PriceHistoryTable()
+    {
+        RobustXamlLoader.Load(this);
+
+        // Create the stylebox here so we can use the colors from StockTradingUi
+        var styleBox = new StyleBoxFlat
+        {
+            BackgroundColor = StockTradingUiFragment.PriceBackgroundColor,
+            ContentMarginLeftOverride = 6,
+            ContentMarginRightOverride = 6,
+            ContentMarginTopOverride = 4,
+            ContentMarginBottomOverride = 4,
+            BorderColor = StockTradingUiFragment.BorderColor,
+            BorderThickness = new Thickness(1),
+        };
+
+        HistoryPanel.PanelOverride = styleBox;
+    }
+
+    public void Update(List<float> priceHistory)
+    {
+        PriceGrid.RemoveAllChildren();
+
+        // Take last 5 prices
+        var lastFivePrices = priceHistory.TakeLast(5).ToList();
+
+        for (var i = 0; i < lastFivePrices.Count; i++)
+        {
+            var price = lastFivePrices[i];
+            var previousPrice = i > 0 ? lastFivePrices[i - 1] : price;
+            var priceChange = ((price - previousPrice) / previousPrice) * 100;
+
+            var entryContainer = new BoxContainer
+            {
+                Orientation = LayoutOrientation.Vertical,
+                MinWidth = 80,
+                HorizontalAlignment = HAlignment.Center,
+            };
+
+            var priceLabel = new Label
+            {
+                Text = $"§{price:F2}",
+                HorizontalAlignment = HAlignment.Center,
+            };
+
+            var changeLabel = new Label
+            {
+                Text = $"{(priceChange >= 0 ? "+" : "")}{priceChange:F2}%",
+                HorizontalAlignment = HAlignment.Center,
+                StyleClasses = { "LabelSubText" },
+                Modulate = priceChange switch
+                {
+                    > 0 => StockTradingUiFragment.PositiveColor,
+                    < 0 => StockTradingUiFragment.NegativeColor,
+                    _ => StockTradingUiFragment.NeutralColor,
+                }
+            };
+
+            entryContainer.AddChild(priceLabel);
+            entryContainer.AddChild(changeLabel);
+            PriceGrid.AddChild(entryContainer);
+        }
+    }
+}

Content.Client/_DV/CartridgeLoader/Cartridges/StockTradingUi.cs

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+using Robust.Client.UserInterface;
+using Content.Client.UserInterface.Fragments;
+using Content.Shared.CartridgeLoader;
+using Content.Shared.CartridgeLoader.Cartridges;
+
+namespace Content.Client._DV.CartridgeLoader.Cartridges;
+
+public sealed partial class StockTradingUi : UIFragment
+{
+    private StockTradingUiFragment? _fragment;
+
+    public override Control GetUIFragmentRoot()
+    {
+        return _fragment!;
+    }
+
+    public override void Setup(BoundUserInterface userInterface, EntityUid? fragmentOwner)
+    {
+        _fragment = new StockTradingUiFragment();
+
+        _fragment.OnBuyButtonPressed += (company, amount) =>
+        {
+            SendStockTradingUiMessage(StockTradingUiAction.Buy, company, amount, userInterface);
+        };
+        _fragment.OnSellButtonPressed += (company, amount) =>
+        {
+            SendStockTradingUiMessage(StockTradingUiAction.Sell, company, amount, userInterface);
+        };
+    }
+
+    public override void UpdateState(BoundUserInterfaceState state)
+    {
+        if (state is StockTradingUiState cast)
+        {
+            _fragment?.UpdateState(cast);
+        }
+    }
+
+    private static void SendStockTradingUiMessage(StockTradingUiAction action, int company, int amount, BoundUserInterface userInterface)
+    {
+        var newsMessage = new StockTradingUiMessageEvent(action, company, amount);
+        var message = new CartridgeUiMessage(newsMessage);
+        userInterface.SendMessage(message);
+    }
+}

Content.Client/_DV/CartridgeLoader/Cartridges/StockTradingUiFragment.xaml

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+<cartridges:StockTradingUiFragment
+    xmlns="https://spacestation14.io"
+    xmlns:cartridges="clr-namespace:Content.Client._DV.CartridgeLoader.Cartridges"
+    xmlns:customControls="clr-namespace:Content.Client.Administration.UI.CustomControls"
+    Margin="5"
+    VerticalExpand="True">
+
+    <!-- A parent container to hold the balance label and main content -->
+    <BoxContainer Orientation="Vertical" HorizontalExpand="True" VerticalExpand="True">
+        <!-- Header section with balance -->
+        <PanelContainer StyleClasses="AngleRect">
+            <BoxContainer Orientation="Horizontal" HorizontalExpand="True">
+                <BoxContainer Orientation="Horizontal" HorizontalExpand="True" Margin="0,0,5,0">
+                    <Label Text="{Loc stock-trading-title}"
+                           HorizontalExpand="True"
+                           HorizontalAlignment="Left" />
+                </BoxContainer>
+                <Label Name="Balance"
+                       Text="{Loc stock-trading-balance}"
+                       HorizontalAlignment="Right" />
+            </BoxContainer>
+        </PanelContainer>
+
+        <!-- Horizontal line under header -->
+        <customControls:HSeparator Margin="5 3 5 5"/>
+
+        <!-- Main content -->
+        <BoxContainer Orientation="Vertical" HorizontalExpand="True" VerticalExpand="True">
+            <Label Name="NoEntries"
+                   Text="{Loc stock-trading-no-entries}"
+                   HorizontalExpand="True"
+                   HorizontalAlignment="Center"
+                   Visible="False" />
+            <ScrollContainer HorizontalExpand="True"
+                             VerticalExpand="True"
+                             Margin="0,5,0,0">
+                <BoxContainer Name="Entries"
+                              Orientation="Vertical"
+                              VerticalAlignment="Top"
+                              HorizontalExpand="True" />
+            </ScrollContainer>
+        </BoxContainer>
+    </BoxContainer>
+</cartridges:StockTradingUiFragment>