Position ContextMenu on selected item when negative coordinates are provided

CHANGELOG

@@ -1,8 +1,9 @@
-v1.4.8 (WIP)
+v1.4.8 (2020-08-11)
 - Add italic text formatting flag
 - Add Modal.GetForm and Modal.GetFrame
 - Fix Form.Clear deadlock
 - Fill nil Flex space with default background color
+- Position ContextMenu on selected item when negative coordinates are provided
 - Use sync.RWMutex in all widgets
 
 v1.4.7 (2020-06-09)

contextmenu.go

@@ -101,7 +101,8 @@ func (c *ContextMenu) SetContextSelectedFunc(handler func(index int, text string
 	return c
 }
 
-// ShowContextMenu shows the context menu.
+// ShowContextMenu shows the context menu. Provide -1 for both to position on
+// the selected item, or specify a 	position.
 func (c *ContextMenu) ShowContextMenu(item int, x int, y int, setFocus func(Primitive)) {
 	c.l.Lock()
 	defer c.l.Unlock()

go.mod

@@ -8,6 +8,6 @@ require (
 	github.com/mattn/go-runewidth v0.0.9
 	github.com/rivo/uniseg v0.1.0
 	gitlab.com/tslocum/cbind v0.1.1
-	golang.org/x/sys v0.0.0-20200802091954-4b90ce9b60b3 // indirect
+	golang.org/x/sys v0.0.0-20200810151505-1b9f1253b3ed // indirect
 	golang.org/x/text v0.3.3 // indirect
 )

go.sum

@@ -23,8 +23,8 @@ gitlab.com/tslocum/cbind v0.1.1/go.mod h1:rX7vkl0pUSg/yy427MmD1FZAf99S7WwpUlxF/q
 golang.org/x/sys v0.0.0-20190626150813-e07cf5db2756 h1:9nuHUbU8dRnRRfj9KjWUVrJeoexdbeMjttk6Oh1rD10=
 golang.org/x/sys v0.0.0-20190626150813-e07cf5db2756/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200202164722-d101bd2416d5/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20200802091954-4b90ce9b60b3 h1:qDJKu1y/1SjhWac4BQZjLljqvqiWUhjmDMnonmVGDAU=
-golang.org/x/sys v0.0.0-20200802091954-4b90ce9b60b3/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20200810151505-1b9f1253b3ed h1:WBkVNH1zd9jg/dK4HCM4lNANnmd12EHC9z+LmcCG4ns=
+golang.org/x/sys v0.0.0-20200810151505-1b9f1253b3ed/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/text v0.3.0 h1:g61tztE5qeGQ89tm6NTjjM9VPIm088od1l6aSorWRWg=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.2 h1:tW2bmiBqwgJj/UpqtC8EpXEZVYOwU0yG4iWbprSVAcs=

list.go

@@ -857,13 +857,26 @@ func (l *List) Draw(screen tcell.Screen) {
 
 		cx, cy := l.ContextMenu.x, l.ContextMenu.y
 		if cx < 0 || cy < 0 {
-			cx = x + (width / 2)
-			cy = y + (height / 2)
+			offsetX := 7
+			if showShortcuts {
+				offsetX += 4
+			}
+			offsetY := l.currentItem
+			if l.showSecondaryText {
+				offsetY *= 2
+			}
+			x, y, _, _ := l.GetInnerRect()
+			cx, cy = x+offsetX, y+offsetY
 		}
 
 		_, sheight := screen.Size()
 		if cy+lheight >= sheight && cy-2 > lheight-cy {
-			cy = y - lheight
+			for i := (cy + lheight) - sheight; i > 0; i-- {
+				cy--
+				if cy+lheight < sheight {
+					break
+				}
+			}
 			if cy < 0 {
 				cy = 0
 			}
@@ -920,26 +933,7 @@ func (l *List) InputHandler() func(event *tcell.EventKey, setFocus func(p Primit
 				}
 			}
 		} else if HitShortcut(event, Keys.ShowContextMenu) {
-			// Do we show any shortcuts?
-			var showShortcuts bool
-			for _, item := range l.items {
-				if item.Shortcut != 0 {
-					showShortcuts = true
-					break
-				}
-			}
-
-			offsetX := 7
-			if showShortcuts {
-				offsetX += 4
-			}
-			offsetY := l.currentItem
-			if l.showSecondaryText {
-				offsetY *= 2
-			}
-
-			x, y, _, _ := l.GetInnerRect()
-			defer l.ContextMenu.show(l.currentItem, x+offsetX, y+offsetY, setFocus)
+			defer l.ContextMenu.show(l.currentItem, -1, -1, setFocus)
 		} else if len(l.items) == 0 {
 			l.Unlock()
 			return