Hud refactor (#7202)

Co-authored-by: DrSmugleaf <DrSmugleaf@users.noreply.github.com>
Co-authored-by: Jezithyr <jmaster9999@gmail.com>
Co-authored-by: Jezithyr <Jezithyr@gmail.com>
Co-authored-by: Visne <39844191+Visne@users.noreply.github.com>
Co-authored-by: wrexbe <wrexbe@protonmail.com>
Co-authored-by: wrexbe <81056464+wrexbe@users.noreply.github.com>

Content.Client/UserInterface/Systems/Chat/Controls/ChatInputBox.cs

@@ -0,0 +1,53 @@
+using Content.Shared.Chat;
+using Robust.Client.UserInterface.Controls;
+
+namespace Content.Client.UserInterface.Systems.Chat.Controls;
+
+[Virtual]
+public class ChatInputBox : PanelContainer
+{
+    public readonly ChannelSelectorButton ChannelSelector;
+    public readonly HistoryLineEdit Input;
+    public readonly ChannelFilterButton FilterButton;
+    protected readonly BoxContainer Container;
+    protected ChatChannel ActiveChannel { get; private set; } = ChatChannel.Local;
+
+    public ChatInputBox()
+    {
+        Container = new BoxContainer
+        {
+            Orientation = BoxContainer.LayoutOrientation.Horizontal,
+            SeparationOverride = 4
+        };
+        AddChild(Container);
+
+        ChannelSelector = new ChannelSelectorButton
+        {
+            Name = "ChannelSelector",
+            ToggleMode = true,
+            StyleClasses = {"chatSelectorOptionButton"},
+            MinWidth = 75
+        };
+        Container.AddChild(ChannelSelector);
+        Input = new HistoryLineEdit
+        {
+            Name = "Input",
+            PlaceHolder = Loc.GetString("hud-chatbox-info"),
+            HorizontalExpand = true,
+            StyleClasses = {"chatLineEdit"}
+        };
+        Container.AddChild(Input);
+        FilterButton = new ChannelFilterButton
+        {
+            Name = "FilterButton",
+            StyleClasses = {"chatFilterOptionButton"}
+        };
+        Container.AddChild(FilterButton);
+        ChannelSelector.OnChannelSelect += UpdateActiveChannel;
+    }
+
+    private void UpdateActiveChannel(ChatSelectChannel selectedChannel)
+    {
+        ActiveChannel = (ChatChannel) selectedChannel;
+    }
+}