Cnc scrollpanel with support for rollover etc.

OpenRA.Game/Widgets/ScrollPanelWidget.cs

@@ -22,15 +22,15 @@ namespace OpenRA.Widgets
 		public int ItemSpacing = 2;
 		
 		public int ContentHeight = 0;
-		float ListOffset = 0;
-		bool UpPressed = false;
-		bool DownPressed = false;
-		bool ThumbPressed = false;
-		Rectangle upButtonRect;
-		Rectangle downButtonRect;
-		Rectangle backgroundRect;
-		Rectangle scrollbarRect;
-		Rectangle thumbRect;
+		protected float ListOffset = 0;
+		protected bool UpPressed = false;
+		protected bool DownPressed = false;
+		protected bool ThumbPressed = false;
+		protected Rectangle upButtonRect;
+		protected Rectangle downButtonRect;
+		protected Rectangle backgroundRect;
+		protected Rectangle scrollbarRect;
+		protected Rectangle thumbRect;
 		
 		public ScrollPanelWidget() : base() {}
 		protected ScrollPanelWidget(ScrollPanelWidget other)
@@ -115,7 +115,7 @@ namespace OpenRA.Widgets
 		void Scroll(int direction)
 		{
 			ListOffset += direction*ScrollVelocity;
-			ListOffset = Math.Min(0,Math.Max(RenderBounds.Height - ContentHeight, ListOffset));
+			ListOffset = Math.Min(0,Math.Max(Bounds.Height - ContentHeight, ListOffset));
 		}
 		
 		public override void Tick ()

OpenRA.Mods.Cnc/Widgets/CncLobbyLogic.cs

@@ -23,7 +23,7 @@ namespace OpenRA.Mods.Cnc.Widgets
 	public class CncLobbyLogic : IWidgetDelegate
 	{
 		Widget LocalPlayerTemplate, RemotePlayerTemplate, EmptySlotTemplate, EmptySlotTemplateHost;
-		ScrollPanelWidget chatPanel;
+		CncScrollPanelWidget chatPanel;
 		Widget chatTemplate;
 		
 		ScrollPanelWidget Players;
@@ -185,7 +185,7 @@ namespace OpenRA.Mods.Cnc.Widgets
 				return true;
 			};
 			
-			chatPanel = lobby.GetWidget<ScrollPanelWidget>("CHAT_DISPLAY");
+			chatPanel = lobby.GetWidget<CncScrollPanelWidget>("CHAT_DISPLAY");
 			chatTemplate = chatPanel.GetWidget("CHAT_TEMPLATE");
 		}
 		
@@ -218,6 +218,7 @@ namespace OpenRA.Mods.Cnc.Widgets
 			template.Bounds.Height += (t.Bounds.Height - oldHeight);
 			
 			chatPanel.AddChild(template);
+			chatPanel.ScrollToBottom();
 		}
 		
 		void UpdatePlayerColor(float hf, float sf, float lf, float r)

OpenRA.Mods.Cnc/Widgets/CncMenuButton.cs

@@ -82,5 +82,72 @@ namespace OpenRA.Mods.Cnc.Widgets
 					new float2(rect.Left + 2, rect.Top + 2));
 		}
 	}
+	
+	public class CncScrollPanelWidget : ScrollPanelWidget
+	{
+		public CncScrollPanelWidget()
+			: base() { }
+		
+		protected CncScrollPanelWidget(CncScrollPanelWidget widget)
+			: base(widget) { }
+		
+		public override void Draw()
+		{
+			if (!IsVisible())
+				return;
+			
+			var rb = RenderBounds;
+			
+			var ScrollbarHeight = rb.Height - 2 * ScrollbarWidth;
+			
+			var thumbHeight = ContentHeight == 0 ? 0 : (int)(ScrollbarHeight*Math.Min(rb.Height*1f/ContentHeight, 1f));
+			var thumbOrigin = rb.Y + ScrollbarWidth + (int)((ScrollbarHeight - thumbHeight)*(-1f*ListOffset/(ContentHeight - rb.Height)));
+			if (thumbHeight == ScrollbarHeight)
+				thumbHeight = 0;
+			
+			backgroundRect = new Rectangle(rb.X, rb.Y, rb.Width - ScrollbarWidth + 1, rb.Height);
+			upButtonRect = new Rectangle(rb.Right - ScrollbarWidth, rb.Y, ScrollbarWidth, ScrollbarWidth);
+			downButtonRect = new Rectangle(rb.Right - ScrollbarWidth, rb.Bottom - ScrollbarWidth, ScrollbarWidth, ScrollbarWidth);
+			scrollbarRect = new Rectangle(rb.Right - ScrollbarWidth, rb.Y + ScrollbarWidth - 1, ScrollbarWidth, ScrollbarHeight + 2);
+			thumbRect = new Rectangle(rb.Right - ScrollbarWidth, thumbOrigin, ScrollbarWidth, thumbHeight);
+			
+			string upButtonBg = (thumbHeight == 0 || ListOffset >= 0) ? "button-disabled" :
+					UpPressed ? "button-pressed" : 
+					upButtonRect.Contains(Viewport.LastMousePos) ? "button-hover" : "button";
+			
+			string downButtonBg = (thumbHeight == 0 || ListOffset <= Bounds.Height - ContentHeight) ? "button-disabled" :
+					DownPressed ? "button-pressed" : 
+					downButtonRect.Contains(Viewport.LastMousePos) ? "button-hover" : "button";
+			
+			string scrollbarBg = "panel-gray";
+			string thumbBg = (Focused && thumbRect.Contains(Viewport.LastMousePos)) ? "button-pressed" : 
+					thumbRect.Contains(Viewport.LastMousePos) ? "button-hover" : "button";
+
+			WidgetUtils.DrawPanel(scrollbarBg, scrollbarRect);
+			WidgetUtils.DrawPanel("panel-gray", backgroundRect);
+			WidgetUtils.DrawPanel(upButtonBg, upButtonRect);
+			WidgetUtils.DrawPanel(downButtonBg, downButtonRect);
+			
+			if (thumbHeight > 0)
+				WidgetUtils.DrawPanel(thumbBg, thumbRect);
+
+			WidgetUtils.DrawRGBA(ChromeProvider.GetImage("scrollbar", "up_arrow"),
+				new float2(upButtonRect.Left + 4, upButtonRect.Top + 4));
+			WidgetUtils.DrawRGBA(ChromeProvider.GetImage("scrollbar", "down_arrow"),
+				new float2(downButtonRect.Left + 4, downButtonRect.Top + 4));
+
+			Game.Renderer.EnableScissor(backgroundRect.X + 1, backgroundRect.Y + 1, backgroundRect.Width - 2, backgroundRect.Height - 2);
+
+			foreach (var child in Children)
+				child.Draw();
+
+			Game.Renderer.DisableScissor();
+		}
+		
+		public void ScrollToBottom()
+		{
+			ListOffset = Math.Min(0,Bounds.Height - ContentHeight);
+		}
+	}
 }
 

mods/cnc/chrome/lobby.yaml

@@ -45,7 +45,7 @@ Container@SERVER_LOBBY:
 					Width:130
 					Height:20
 					Text: Allow Cheats
-				ScrollPanel@PLAYERS:
+				CncScrollPanel@PLAYERS:
 					Id:PLAYERS
 					X:15
 					Y:30
@@ -323,7 +323,7 @@ Container@SERVER_LOBBY:
 							Height:25
 							Align:Right
 							Text:Chat:
-				ScrollPanel@CHAT_DISPLAY:
+				CncScrollPanel@CHAT_DISPLAY:
 					Id:CHAT_DISPLAY
 					X:15
 					Y:285

mods/cnc/chrome/mapchooser.yaml

@@ -31,7 +31,7 @@ Container@MAP_CHOOSER:
 							Y:1
 							Width:192
 							Height:192
-				ScrollPanel@MAP_LIST:
+				CncScrollPanel@MAP_LIST:
 					Id:MAP_LIST
 					X:15
 					Y:30

mods/cnc/chrome/serverbrowser.yaml

@@ -18,7 +18,7 @@ Container@SERVERBROWSER_PANEL:
 			Height:500
 			Background:panel-black
 			Children:
-				ScrollPanel@SERVER_LIST:
+				CncScrollPanel@SERVER_LIST:
 					Id:SERVER_LIST
 					X:15
 					Y:30