feature: support table (#1)

_example/table.go

@@ -0,0 +1,34 @@
+package main
+
+import "termui"
+
+func main() {
+	err := termui.Init()
+	if err != nil {
+		panic(err)
+	}
+	defer termui.Close()
+
+	rows := [][]string{
+		[]string{"header1", "header2", "header3"},
+		[]string{"I love Veronica", "Go-lang is so cool", "Im working on Ruby"},
+		[]string{"2016", "11", "11"},
+	}
+
+	table := termui.NewTable()
+	table.Rows = rows
+	table.FgColor = termui.ColorWhite
+	table.BgColor = termui.ColorDefault
+	table.TextAlign = "center"
+	table.Analysis()
+	table.SetSize()
+	table.Y = 0
+	table.X = 0
+	table.Border = true
+
+	termui.Render(table)
+	termui.Handle("/sys/kbd/q", func(termui.Event) {
+		termui.StopLoop()
+	})
+	termui.Loop()
+}

table.go

@@ -0,0 +1,101 @@
+package termui
+
+import (
+	"fmt"
+	"strings"
+)
+
+/*
+	table := termui.NewTable()
+	table.Rows = rows
+	table.FgColor = termui.ColorWhite
+	table.BgColor = termui.ColorDefault
+	table.Height = 7
+	table.Width = 62
+	table.Y = 0
+	table.X = 0
+	table.Border = true
+*/
+
+type Table struct {
+	Block
+	Rows      [][]string
+	FgColor   Attribute
+	BgColor   Attribute
+	TextAlign string
+}
+
+func NewTable() *Table {
+	table := &Table{Block: *NewBlock()}
+	table.FgColor = ColorWhite
+	table.BgColor = ColorDefault
+	table.TextAlign = "left"
+	return table
+}
+
+func (table *Table) Analysis() {
+	length := len(table.Rows)
+	if length < 1 {
+		return
+	}
+
+	row_width := len(table.Rows[0])
+	cellWidthes := make([]int, row_width)
+
+	for _, row := range table.Rows {
+		for i, str := range row {
+			if cellWidthes[i] < len(str) {
+				cellWidthes[i] = len(str)
+			}
+		}
+	}
+
+	width_sum := 2
+	for i, width := range cellWidthes {
+		width_sum += (width + 2)
+		for u, row := range table.Rows {
+			switch table.TextAlign {
+			case "right":
+				row[i] = fmt.Sprintf(" %*s ", width, table.Rows[u][i])
+			case "center":
+				word_width := len(table.Rows[u][i])
+				offset := (width - word_width) / 2
+				row[i] = fmt.Sprintf(" %*s ", width, fmt.Sprintf("%-*s", offset+word_width, table.Rows[u][i]))
+			default: // left
+				row[i] = fmt.Sprintf(" %-*s ", width, table.Rows[u][i])
+			}
+		}
+	}
+
+	if table.Width == 0 {
+		table.Width = width_sum
+	}
+}
+
+func (table *Table) SetSize() {
+	length := len(table.Rows)
+	table.Height = length*2 + 1
+	table.Width = 2
+	if length != 0 {
+		for _, str := range table.Rows[0] {
+			table.Width += len(str) + 2 + 1
+		}
+	}
+}
+
+func (table *Table) Buffer() Buffer {
+	buffer := table.Block.Buffer()
+	table.Analysis()
+	for i, row := range table.Rows {
+		cells := DefaultTxBuilder.Build(strings.Join(row, "|"), table.FgColor, table.BgColor)
+		border := DefaultTxBuilder.Build(strings.Repeat("─", table.Width-2), table.FgColor, table.BgColor)
+		for x, cell := range cells {
+			buffer.Set(table.innerArea.Min.X+x, table.innerArea.Min.Y+i*2, cell)
+		}
+
+		for x, cell := range border {
+			buffer.Set(table.innerArea.Min.X+x, table.innerArea.Min.Y+i*2+1, cell)
+		}
+	}
+	return buffer
+}