New input widget

Same as `Paragraph`, but for input :)

theme.go

@@ -35,6 +35,7 @@ type RootTheme struct {
 	List            ListTheme
 	Tree            TreeTheme
 	Paragraph       ParagraphTheme
+	Input           InputTheme
 	PieChart        PieChartTheme
 	Sparkline       SparklineTheme
 	StackedBarChart StackedBarChartTheme
@@ -77,6 +78,10 @@ type ParagraphTheme struct {
 	Text Style
 }
 
+type InputTheme struct {
+	Text Style
+}
+
 type PieChartTheme struct {
 	Slices []Color
 }
@@ -121,6 +126,10 @@ var Theme = RootTheme{
 		Text: NewStyle(ColorWhite),
 	},
 
+	Input: InputTheme{
+		Text: NewStyle(ColorWhite),
+	},
+
 	PieChart: PieChartTheme{
 		Slices: StandardColors,
 	},

widgets/input.go

@@ -0,0 +1,84 @@
+// Copyright 2021 Szymon Błaszczyński <museyoucoulduse@gmail.com>. All rights reserved.
+// Use of this source code is governed by a MIT license that can
+// be found in the LICENSE file.
+
+package widgets
+
+import (
+	"image"
+
+	. "github.com/gizak/termui/v3"
+)
+
+type Input struct {
+	Block
+	Text      string
+	TextStyle Style
+	WrapText  bool
+	focusing  bool
+}
+
+// Create new Input widget. Somehow similar to Paragraph.
+func NewInput() *Input {
+	return &Input{
+		Block:     *NewBlock(),
+		TextStyle: Theme.Input.Text,
+		WrapText:  true,
+		focusing:  false,
+		Text:      "",
+	}
+}
+
+func (self *Input) Draw(buf *Buffer) {
+	self.Block.Draw(buf)
+
+	cells := ParseStyles(self.Text, self.TextStyle)
+	if self.WrapText {
+		cells = WrapCells(cells, uint(self.Inner.Dx()))
+	}
+
+	rows := SplitCells(cells, '\n')
+
+	for y, row := range rows {
+		if y+self.Inner.Min.Y >= self.Inner.Max.Y {
+			break
+		}
+		row = TrimCells(row, self.Inner.Dx())
+		for _, cx := range BuildCellWithXArray(row) {
+			x, cell := cx.X, cx.Cell
+			buf.SetCell(cell, image.Pt(x, y).Add(self.Inner.Min))
+		}
+	}
+}
+
+// Focus on input field and start typing.
+// Best used with go routine 'go inputField.Focus()'
+func (i *Input) Focus() {
+	i.focusing = true
+Loop:
+	for {
+		events := PollEvents()
+		e := <-events
+		if e.Type == KeyboardEvent {
+			switch e.ID {
+			case "<Backspace>":
+				if len(i.Text) > 0 {
+					i.Text = i.Text[:len(i.Text)-1]
+					Render(i)
+				}
+			case "<Escape>", "C-c", "<Enter>":
+				i.focusing = false
+				break Loop
+			case "<Space>":
+				i.Text = i.Text + " "
+				Render(i)
+			case "<Tab>":
+				i.Text = i.Text + "\t"
+				Render(i)
+			default:
+				i.Text = i.Text + e.ID
+				Render(i)
+			}
+		}
+	}
+}