From 9bc7dcfa10c21e4ee1b393155d252002c9fbc628 Mon Sep 17 00:00:00 2001
From: terencehill <piuntn@gmail.com>
Date: Mon, 31 Jan 2022 16:53:43 +0100
Subject: [PATCH] Allow scrolling the maximized chat history by pressing mouse
 wheel up/down and page up/down

---
 qcsrc/client/hud/panel/chat.qc | 73 ++++++++++++++++++++++++++++++++--
 qcsrc/client/hud/panel/chat.qh |  2 +
 qcsrc/client/main.qc           |  4 ++
 3 files changed, 76 insertions(+), 3 deletions(-)

diff --git a/qcsrc/client/hud/panel/chat.qc b/qcsrc/client/hud/panel/chat.qc
index 07de3b7dd..c1313b86e 100644
--- a/qcsrc/client/hud/panel/chat.qc
+++ b/qcsrc/client/hud/panel/chat.qc
@@ -9,6 +9,62 @@ void HUD_Chat_Export(int fh)
 	// allow saving cvars that aesthetically change the panel into hud skin files
 }
 
+float chat_maximized_scroll_ofs;
+float chat_maximized_reset_scroll_time;
+float HUD_Panel_Chat_InputEvent(float bInputType, float nPrimary, float nSecondary)
+{
+	if(bInputType == 3)
+	{
+		mousepos.x = nPrimary;
+		mousepos.y = nSecondary;
+		return true;
+	}
+
+	if(bInputType == 2)
+		return false;
+
+	// at this point bInputType can only be 0 or 1 (key pressed or released)
+	bool key_pressed = (bInputType == 0);
+
+	if(!autocvar__con_chat_maximized)
+		return false;
+
+	if(nPrimary == K_MWHEELUP)
+	{
+		if (!key_pressed)
+			return true;
+		chat_maximized_scroll_ofs += 5 * cvar("con_chatsize");
+		return true;
+	}
+	else if(nPrimary == K_MWHEELDOWN)
+	{
+		if (!key_pressed)
+			return true;
+		chat_maximized_scroll_ofs -= 5 * cvar("con_chatsize");
+		if (chat_maximized_scroll_ofs < 0)
+			chat_maximized_scroll_ofs = 0;
+		return true;
+	}
+	else if(nPrimary == K_PGUP)
+	{
+		if (!key_pressed)
+			return true;
+		chat_maximized_scroll_ofs += vid_conheight / 2;
+		return true;
+	}
+	else if(nPrimary == K_PGDN)
+	{
+		if (!key_pressed)
+			return true;
+		chat_maximized_scroll_ofs -= vid_conheight / 2;
+		if (chat_maximized_scroll_ofs < 0)
+			chat_maximized_scroll_ofs = 0;
+		return true;
+	}
+
+	return false;
+}
+
 void HUD_Chat()
 {
 	if(!autocvar__hud_configure)
@@ -21,16 +77,26 @@ void HUD_Chat()
 				cvar_set("con_chat", "-1");
 			return;
 		}
+
 		if(autocvar__con_chat_maximized)
 		{
 			if(!hud_draw_maximized) return;
+
+			chat_maximized_reset_scroll_time = time + 3;
 		}
-		else if(chat_panel_modified)
+		else
 		{
-			panel.update_time = time; // forces reload of panel attributes
-			chat_panel_modified = false;
+			if(chat_panel_modified)
+			{
+				panel.update_time = time; // forces reload of panel attributes
+				chat_panel_modified = false;
+			}
+			if (time > chat_maximized_reset_scroll_time)
+				chat_maximized_scroll_ofs = 0;
 		}
 	}
+	else
+		chat_maximized_scroll_ofs = 0;
 
 	HUD_Panel_LoadCvars();
 
@@ -57,6 +123,7 @@ void HUD_Chat()
 			chat_panel_modified = true;
 		}
 		panel_bg_alpha = max(0.75, panel_bg_alpha);
+		panel_size.y += chat_maximized_scroll_ofs;
 	}
 
 	vector pos, mySize;
diff --git a/qcsrc/client/hud/panel/chat.qh b/qcsrc/client/hud/panel/chat.qh
index 9ed87d9f3..b17ba1a9a 100644
--- a/qcsrc/client/hud/panel/chat.qh
+++ b/qcsrc/client/hud/panel/chat.qh
@@ -13,3 +13,5 @@ bool autocvar_con_chatrect;
 //float autocvar_con_chatrect_x;
 //float autocvar_con_chatrect_y;
 float autocvar_con_chatwidth;
+
+float HUD_Panel_Chat_InputEvent(float bInputType, float nPrimary, float nSecondary);
diff --git a/qcsrc/client/main.qc b/qcsrc/client/main.qc
index 5dbfb7209..649def85c 100644
--- a/qcsrc/client/main.qc
+++ b/qcsrc/client/main.qc
@@ -4,6 +4,7 @@
 #include <client/draw.qh>
 #include <client/hud/_mod.qh>
 #include <client/hud/panel/centerprint.qh>
+#include <client/hud/panel/chat.qh>
 #include <client/hud/panel/quickmenu.qh>
 #include <client/hud/panel/scoreboard.qh>
 #include <client/items/items.qh>
@@ -452,10 +453,13 @@ float CSQC_InputEvent(int bInputType, float nPrimary, float nSecondary)
 {
 	TC(int, bInputType);
 	bool override = false;
+
 	override |= HUD_Panel_InputEvent(bInputType, nPrimary, nSecondary);
 	if (override)
 		return true;
 
+	override |= HUD_Panel_Chat_InputEvent(bInputType, nPrimary, nSecondary);
+
 	override |= QuickMenu_InputEvent(bInputType, nPrimary, nSecondary);
 
 	override |= HUD_Radar_InputEvent(bInputType, nPrimary, nSecondary);
-- 
2.39.2