Add space heaters (#25250)

Content.Client/Atmos/UI/SpaceHeaterWindow.xaml.cs

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+using Robust.Client.AutoGenerated;
+using Robust.Client.UserInterface.Controls;
+using Robust.Client.UserInterface.CustomControls;
+using Robust.Client.UserInterface.XAML;
+using Content.Shared.Atmos;
+using Content.Shared.Atmos.Piping.Portable.Components;
+
+namespace Content.Client.Atmos.UI;
+
+/// <summary>
+///     Client-side UI used to control a space heater.
+/// </summary>
+[GenerateTypedNameReferences]
+public sealed partial class SpaceHeaterWindow : DefaultWindow
+{
+    // To account for a minimum delta temperature for atmos equalization to trigger we use a fixed step for target temperature increment/decrement
+    public int TemperatureChangeDelta = 5;
+    public bool Active;
+
+    // Temperatures range bounds in Kelvin (K)
+    public float MinTemp;
+    public float MaxTemp;
+
+    public RadioOptions<int> PowerLevelSelector;
+
+    public SpaceHeaterWindow()
+    {
+        RobustXamlLoader.Load(this);
+
+        // Add the Mode selector list
+        foreach (var value in Enum.GetValues<SpaceHeaterMode>())
+        {
+            ModeSelector.AddItem(Loc.GetString($"comp-space-heater-mode-{value}"), (int)value);
+        }
+
+        // Add the Power level radio buttons
+        PowerLevelSelectorHBox.AddChild(PowerLevelSelector = new RadioOptions<int>(RadioOptionsLayout.Horizontal));
+        PowerLevelSelector.FirstButtonStyle = "OpenRight";
+        PowerLevelSelector.LastButtonStyle = "OpenLeft";
+        PowerLevelSelector.ButtonStyle = "OpenBoth";
+        foreach (var value in Enum.GetValues<SpaceHeaterPowerLevel>())
+        {
+            PowerLevelSelector.AddItem(Loc.GetString($"comp-space-heater-ui-{value}-power-consumption"), (int)value);
+        }
+
+        // Only allow temperature increment/decrement of TemperatureChangeDelta
+        Thermostat.Editable = false;
+    }
+
+    public void SetActive(bool active)
+    {
+        Active = active;
+        ToggleStatusButton.Pressed = active;
+
+        if (active)
+        {
+            ToggleStatusButton.Text = Loc.GetString("comp-space-heater-ui-status-enabled");
+        }
+        else
+        {
+            ToggleStatusButton.Text = Loc.GetString("comp-space-heater-ui-status-disabled");
+        }
+    }
+
+    public void SetTemperature(float targetTemperature)
+    {
+        Thermostat.SetText($"{targetTemperature - Atmospherics.T0C} °C");
+
+        IncreaseTempRange.Disabled = targetTemperature + TemperatureChangeDelta > MaxTemp;
+        DecreaseTempRange.Disabled = targetTemperature - TemperatureChangeDelta < MinTemp;
+    }
+}
+