From 1c9fbd0059d93b6dd57837020f3ef951a729acbb Mon Sep 17 00:00:00 2001
From: salmonik <raisersoft@proton.me>
Date: Tue, 28 Apr 2026 17:51:33 +0200
Subject: scrollbar + scroll on mousescroll

---
 x.c | 31 ++++++++++++++++++++++++++++++-
 1 file changed, 30 insertions(+), 1 deletion(-)

(limited to 'x.c')

diff --git a/x.c b/x.c
index 8c9a74e..9c0ddc5 100644
--- a/x.c
+++ b/x.c
@@ -749,7 +749,7 @@ cresize(int width, int height)
 	if (height != 0)
 		win.h = height;
 
-	col = (win.w - 2 * borderpx) / win.cw;
+	col = (win.w - 2 * borderpx - scrollbarwidth) / win.cw;
 	row = (win.h - 2 * borderpx) / win.ch;
 	col = MAX(1, col);
 	row = MAX(1, row);
@@ -1750,6 +1750,35 @@ xdrawline(Line line, int x1, int y1, int x2)
 		xdrawglyphfontspecs(specs, base, i, ox, y1);
 }
 
+void
+xdrawscrollbar(int offset, int total, int visible)
+{
+	int sb_width = scrollbarwidth;
+	int sb_x = win.w - sb_width;
+	int max_off = total - visible;
+
+	if (max_off <= 0 || sb_width == 0)
+		return;
+
+	/* draw scrollbar background - full height from top to bottom */
+	if (scrollbarbg >= 0) {
+		XSetForeground(xw.dpy, dc.gc, dc.col[scrollbarbg].pixel);
+		XFillRectangle(xw.dpy, xw.buf, dc.gc, sb_x, 0,
+				sb_width, win.h);
+	}
+
+	/* calculate thumb position and height */
+	int sb_height = win.h;
+	int thumb_h = MAX(2, ((float)visible / total) * sb_height);
+	int thumb_y = ((float)(max_off - offset) / max_off) *
+			(sb_height - thumb_h);
+
+	/* draw scrollbar thumb */
+	XSetForeground(xw.dpy, dc.gc, dc.col[scrollbarcolor].pixel);
+	XFillRectangle(xw.dpy, xw.buf, dc.gc, sb_x,
+			thumb_y, sb_width, thumb_h);
+}
+
 void
 xfinishdraw(void)
 {
-- 
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