From ebb42b7777c988f802d863251512225e53b92b8f Mon Sep 17 00:00:00 2001
From: faiface <faiface2202@gmail.com>
Date: Mon, 6 May 2019 18:57:31 +0200
Subject: add mouse scrolling docs

---
 README.md                       | 4 +++-
 examples/imageviewer/browser.go | 2 +-
 win/win.go                      | 3 ++-
 3 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/README.md b/README.md
index a74dd6b..c69f1dd 100644
--- a/README.md
+++ b/README.md
@@ -100,7 +100,9 @@ case event.Matches("mo/move/%d/%d", &x, &y):
 case event.Matches("mo/down/%d/%d/%s", &x, &y, &btn):
     // mouse button pressed on (x, y)
 case event.Matches("mo/up/%d/%d/%s", &x, &y, &btn):
-    // mouse button released on (x, y)
+	// mouse button released on (x, y)
+case event.Matches("mo/scroll/%d/%d", &x, &y):
+	// mouse scrolled by (x, y)
 case event.Matches("kb/type/%d", &r):
     // rune r typed on the keyboard (encoded as a number in the event string)
 case event.Matches("kb/down/%s", &key):
diff --git a/examples/imageviewer/browser.go b/examples/imageviewer/browser.go
index 087e596..e3df54e 100644
--- a/examples/imageviewer/browser.go
+++ b/examples/imageviewer/browser.go
@@ -157,7 +157,7 @@ func Browser(env gui.Env, theme *Theme, dir string, cd <-chan string, view chan<
 					env.Draw() <- redraw(r, selected, position, lineHeight, namesImage)
 				}
 
-			case e.Matches("mo/scroll/%d/%d", &y, &x):
+			case e.Matches("mo/scroll/%d/%d", &x, &y):
 				newP := position.Sub(image.Pt(int(x*16), int(y*16)))
 				if newP.X > namesImage.Bounds().Max.X-r.Dx() {
 					newP.X = namesImage.Bounds().Max.X - r.Dx()
diff --git a/win/win.go b/win/win.go
index 55cd434..c4972c2 100644
--- a/win/win.go
+++ b/win/win.go
@@ -136,6 +136,7 @@ func makeGLFWWin(o *options) (*glfw.Window, error) {
 //   mo/move/<x>/<y>           Mouse moved to (x, y).
 //   mo/down/<x>/<y>/<button>  A mouse button pressed on (x, y).
 //   mo/up/<x>/<y>/<button>    A mouse button released on (x, y).
+//   mo/scroll/<x>/<y>         Mouse scrolled by (x, y).
 //   kb/type/<code>            A unicode character typed on the keyboard.
 //   kb/down/<key>             A key on the keyboard pressed.
 //   kb/up/<key>               A key on the keyboard released.
@@ -217,7 +218,7 @@ func (w *Win) eventThread() {
 	})
 
 	w.w.SetScrollCallback(func(_ *glfw.Window, xoff, yoff float64) {
-		w.eventsIn <- gui.Eventf("mo/scroll/%d/%d", int(yoff), int(xoff))
+		w.eventsIn <- gui.Eventf("mo/scroll/%d/%d", int(xoff), int(yoff))
 	})
 
 	w.w.SetCharCallback(func(_ *glfw.Window, r rune) {
-- 
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