From 95dc0d6e380d494e81d0119876ea83a76e00f1f3 Mon Sep 17 00:00:00 2001
From: Lingxuan Ye <yelingxuan@xiaomi.com>
Date: Wed, 15 Apr 2026 14:31:56 +0800
Subject: [PATCH] added drag column function

---
 yazi-actor/src/app/mouse.rs            |  7 ++--
 yazi-config/preset/yazi-default.toml   |  2 +-
 yazi-plugin/preset/components/root.lua | 48 +++++++++++++++++++++++++-
 3 files changed, 53 insertions(+), 4 deletions(-)

diff --git a/yazi-actor/src/app/mouse.rs b/yazi-actor/src/app/mouse.rs
index c7717806..dc935fa4 100644
--- a/yazi-actor/src/app/mouse.rs
+++ b/yazi-actor/src/app/mouse.rs
@@ -5,7 +5,7 @@ use tracing::error;
 use yazi_actor::lives::Lives;
 use yazi_binding::runtime_scope;
 use yazi_config::YAZI;
-use yazi_macro::succ;
+use yazi_macro::{render, succ};
 use yazi_parser::app::MouseForm;
 use yazi_plugin::LUA;
 use yazi_shared::data::Data;
@@ -45,7 +45,10 @@ impl Actor for Mouse {
 				MouseEventKind::ScrollLeft => root.call_method("touch", (event, -1))?,
 
 				MouseEventKind::Moved => root.call_method("move", event)?,
-				MouseEventKind::Drag(_) => root.call_method("drag", event)?,
+				MouseEventKind::Drag(_) => {
+					root.call_method::<()>("drag", event)?;
+					render!();
+				}
 			}
 
 			Ok(())
diff --git a/yazi-config/preset/yazi-default.toml b/yazi-config/preset/yazi-default.toml
index 8b486c16..f6566e5c 100644
--- a/yazi-config/preset/yazi-default.toml
+++ b/yazi-config/preset/yazi-default.toml
@@ -14,7 +14,7 @@ linemode       = "none"
 show_hidden    = false
 show_symlink   = true
 scrolloff      = 5
-mouse_events   = [ "click", "scroll" ]
+mouse_events   = [ "click", "scroll", "drag" ]
 
 [preview]
 wrap            = "no"
diff --git a/yazi-plugin/preset/components/root.lua b/yazi-plugin/preset/components/root.lua
index 67824985..5ffdbaec 100644
--- a/yazi-plugin/preset/components/root.lua
+++ b/yazi-plugin/preset/components/root.lua
@@ -1,6 +1,7 @@
 Root = {
 	_id = "root",
 	_drag_start = ui.Rect {},
+	_drag_which = nil, -- "left" or "right" when dragging a panel separator
 }
 
 function Root:new(area)
@@ -53,6 +54,26 @@ function Root:click(event, up)
 	if tostring(cx.layer) ~= "mgr" then
 		return
 	end
+
+	if up then
+		Root._drag_which = nil
+	elseif event.is_left then
+		-- Check if clicking on a panel separator (Tab is self._children[3])
+		local tab = self._children[3]
+		if tab and tab._chunks then
+			local c = tab._chunks
+			local lx = c[2].x - 1 -- left separator center x
+			local rx = c[3].x     -- right separator center x
+			if c[1].w > 0 and event.x >= lx - 1 and event.x <= lx + 1 then
+				Root._drag_which = "left"
+				return
+			elseif c[3].w > 0 and event.x >= rx - 1 and event.x <= rx + 1 then
+				Root._drag_which = "right"
+				return
+			end
+		end
+	end
+
 	local c = ya.child_at(ui.Rect { x = event.x, y = event.y }, self:reflow())
 	return c and c:click(event, up)
 end
@@ -75,4 +96,29 @@ end
 
 function Root:move(event) end
 
-function Root:drag(event) end
+function Root:drag(event)
+	if not Root._drag_which then
+		return
+	end
+
+	local tab = self._children[3]
+	if not tab or not tab._chunks then
+		return
+	end
+
+	local c = tab._chunks
+	local ratio = rt.mgr.ratio
+
+	if Root._drag_which == "left" then
+		-- Dragging the left separator: adjust parent and current widths
+		local new_parent = math.max(1, event.x - c[1].x + 1)
+		local new_current = math.max(1, c[1].w + c[2].w - new_parent)
+		rt.mgr.ratio = { new_parent, new_current, c[3].w > 0 and c[3].w or 1 }
+	elseif Root._drag_which == "right" then
+		-- Dragging the right separator: adjust current and preview widths
+		local right_edge = c[3].x + c[3].w - 1
+		local new_preview = math.max(1, right_edge - event.x)
+		local new_current = math.max(1, c[2].w + c[3].w - new_preview)
+		rt.mgr.ratio = { c[1].w > 0 and c[1].w or 1, new_current, new_preview }
+	end
+end