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package termui
import (
"fmt"
"strings"
)
// Table tracks all the attributes of a Table instance
type Table struct {
*Block
Header []string
Rows [][]string
ColWidths []int
CellXPos []int // column position
Gap int // gap between columns
Cursor Color
UniqueCol int // the column used to identify the selected item
SelectedItem string // used to keep the cursor on the correct item if the data changes
SelectedRow int
TopRow int // used to indicate where in the table we are scrolled at
ColResizer func() // for widgets that inherit a Table and want to overload the ColResize method
}
// NewTable returns a new Table instance
func NewTable() *Table {
self := &Table{
Block: NewBlock(),
Cursor: Theme.TableCursor,
SelectedRow: 0,
TopRow: 0,
UniqueCol: 0,
}
self.ColResizer = self.ColResize
return self
}
// ColResize is the default column resizer, but can be overriden.
// ColResize calculates the width of each column.
func (self *Table) ColResize() {
// calculate gap size based on total width
self.Gap = 3
if self.X < 50 {
self.Gap = 1
} else if self.X < 75 {
self.Gap = 2
}
cur := 0
for _, w := range self.ColWidths {
cur += self.Gap
self.CellXPos = append(self.CellXPos, cur)
cur += w
}
}
// Buffer implements the Bufferer interface.
func (self *Table) Buffer() *Buffer {
buf := self.Block.Buffer()
self.ColResizer()
// prints header
for i, h := range self.Header {
width := self.ColWidths[i]
if width == 0 {
break
}
h = MaxString(h, self.X-6)
buf.SetString(self.CellXPos[i], 1, h, self.Fg|AttrBold, self.Bg)
}
// prints each row
for rowNum := self.TopRow; rowNum < self.TopRow+self.Y-1 && rowNum < len(self.Rows); rowNum++ {
if rowNum < 0 || rowNum >= len(self.Rows) {
Error("table rows",
fmt.Sprint(
"rowNum: ", rowNum, "\n",
"self.TopRow: ", self.TopRow, "\n",
"len(self.Rows): ", len(self.Rows), "\n",
"self.Y: ", self.Y,
))
}
row := self.Rows[rowNum]
y := (rowNum + 2) - self.TopRow
// prints cursor
bg := self.Bg
if (self.SelectedItem == "" && rowNum == self.SelectedRow) || (self.SelectedItem != "" && self.SelectedItem == row[self.UniqueCol]) {
bg = self.Cursor
for _, width := range self.ColWidths {
if width == 0 {
break
}
buf.SetString(1, y, strings.Repeat(" ", self.X), self.Fg, bg)
}
self.SelectedItem = row[self.UniqueCol]
self.SelectedRow = rowNum
}
// prints each col of the row
for i, width := range self.ColWidths {
if width == 0 {
break
}
r := MaxString(row[i], self.X-6)
buf.SetString(self.CellXPos[i], y, r, self.Fg, bg)
}
}
return buf
}
/////////////////////////////////////////////////////////////////////////////////
// Cursor Movement //
/////////////////////////////////////////////////////////////////////////////////
// calcPos is used to calculate the cursor position and the current view.
func (self *Table) calcPos() {
self.SelectedItem = ""
if self.SelectedRow < 0 {
self.SelectedRow = 0
}
if self.SelectedRow < self.TopRow {
self.TopRow = self.SelectedRow
}
if self.SelectedRow > len(self.Rows)-1 {
self.SelectedRow = len(self.Rows) - 1
}
if self.SelectedRow > self.TopRow+(self.Y-2) {
self.TopRow = self.SelectedRow - (self.Y - 2)
}
}
func (self *Table) Up() {
self.SelectedRow -= 1
self.calcPos()
}
func (self *Table) Down() {
self.SelectedRow += 1
self.calcPos()
}
func (self *Table) Top() {
self.SelectedRow = 0
self.calcPos()
}
func (self *Table) Bottom() {
self.SelectedRow = len(self.Rows) - 1
self.calcPos()
}
// The number of lines in a page is equal to the height of the widgeself.
func (self *Table) HalfPageUp() {
self.SelectedRow = self.SelectedRow - (self.Y-2)/2
self.calcPos()
}
func (self *Table) HalfPageDown() {
self.SelectedRow = self.SelectedRow + (self.Y-2)/2
self.calcPos()
}
func (self *Table) PageUp() {
self.SelectedRow -= (self.Y - 2)
self.calcPos()
}
func (self *Table) PageDown() {
self.SelectedRow += (self.Y - 2)
self.calcPos()
}
func (self *Table) Click(x, y int) {
x = x - self.XOffset
y = y - self.YOffset
if (x > 0 && x <= self.X) && (y > 0 && y <= self.Y) {
self.SelectedRow = (self.TopRow + y) - 2
self.calcPos()
}
}
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