add Menu widget type, sort field menu

menu.go

@@ -0,0 +1,107 @@
+package main
+
+import (
+	ui "github.com/gizak/termui"
+)
+
+type Menu struct {
+	ui.Block
+	Items       []string
+	TextFgColor ui.Attribute
+	TextBgColor ui.Attribute
+	Selectable  bool
+	cursorPos   int
+}
+
+func NewMenu(items []string) *Menu {
+	return &Menu{
+		Block:       *ui.NewBlock(),
+		Items:       items,
+		TextFgColor: ui.ThemeAttr("par.text.fg"),
+		TextBgColor: ui.ThemeAttr("par.text.bg"),
+		Selectable:  false,
+		cursorPos:   0,
+	}
+}
+
+func (m *Menu) Buffer() ui.Buffer {
+	var cell ui.Cell
+
+	buf := m.Block.Buffer()
+
+	for n, item := range m.Items {
+		//if n >= m.innerArea.Dy() {
+		//buf.Set(m.innerArea.Min.X+m.innerArea.Dx()-1,
+		//m.innerArea.Min.Y+m.innerArea.Dy()-1,
+		//ui.Cell{Ch: '…', Fg: m.TextFgColor, Bg: m.TextBgColor})
+		//break
+		//}
+
+		x := 2 // initial offset
+		// invert bg/fg colors on currently selected row
+		for _, ch := range item {
+			if m.Selectable && n == m.cursorPos {
+				cell = ui.Cell{Ch: ch, Fg: m.TextBgColor, Bg: m.TextFgColor}
+			} else {
+				cell = ui.Cell{Ch: ch, Fg: m.TextFgColor, Bg: m.TextBgColor}
+			}
+			buf.Set(x, n+2, cell)
+			x++
+		}
+	}
+
+	return buf
+}
+
+func (m *Menu) Up() {
+	if m.cursorPos > 0 {
+		m.cursorPos--
+		ui.Render(m)
+	}
+}
+
+func (m *Menu) Down() {
+	if m.cursorPos < (len(m.Items) - 1) {
+		m.cursorPos++
+		ui.Render(m)
+	}
+}
+
+func HelpMenu(g *Grid) {
+	m := NewMenu([]string{
+		"[h] - open this help dialog",
+		"[q] - exit ctop",
+	})
+	m.Height = 10
+	m.Width = 50
+	m.TextFgColor = ui.ColorWhite
+	m.BorderLabel = "Help"
+	m.BorderFg = ui.ColorCyan
+	ui.Render(m)
+	ui.Handle("/sys/kbd/", func(ui.Event) {
+		ui.StopLoop()
+	})
+	ui.Loop()
+}
+
+func SortMenu(g *Grid) {
+	m := NewMenu(SortFields)
+	m.Height = 10
+	m.Width = 50
+	m.Selectable = true
+	m.TextFgColor = ui.ColorWhite
+	m.BorderLabel = "Sort Field"
+	m.BorderFg = ui.ColorCyan
+	ui.Render(m)
+	ui.Handle("/sys/kbd/<up>", func(ui.Event) {
+		m.Up()
+	})
+	ui.Handle("/sys/kbd/<down>", func(ui.Event) {
+		m.Down()
+	})
+	ui.Handle("/sys/kbd/<enter>", func(ui.Event) {
+		g.containerMap.sortField = m.Items[m.cursorPos]
+		ui.StopLoop()
+	})
+	ui.Loop()
+}