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tableview.go
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tableview.go
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package clui
import (
"fmt"
term "github.com/nsf/termbox-go"
)
/*
TableView is control to display a list of items in a table(grid).
Content is scrollable with arrow keys and mouse.
TableView always works in virtual mode - it does not keep table
data and always asks for the cell value using callback OnDrawCell.
Predefined hotkeys:
Arrows - move cursor
Home, End - move cursor to first and last column, respectively
Alt+Home, Alt+End - move cursor to first and last row, respectively
PgDn, PgUp - move cursor to a screen down and up
Enter, F2 - emits event TableActionEdit
Insert - emits event TableActionNew
Delete - emits event TableActionDelete
F4 - Change sort mode
Events:
OnDrawCell - called every time the table is going to draw a cell.
The argument is ColumnDrawInfo prefilled with the current
cell attributes. Callback should fill at least the field
Title. Filling Bg, Fg, and Alignment are optional. Changing
other fields in callback does not make any difference - they
are only for caller convenience
OnAction - called when a user pressed some hotkey(please, see
above) or clicks any column header(in this case, the control
sends TableActionSort event and fills column number and
sorting type - no sort, ascending, descending)
OnKeyPress - called every time a user presses a key. Callback should
return true if TableView must skip internal key processing.
E.g, a user can disable emitting TableActionDelete event by
adding callback OnKeyPress and return true in case of Delete
key is pressed
OnSelectCell - called in case of the currently selected row or
column is changed
OnBeforeDraw - called right before the TableView is going to repaint
itself. It can be used to prepare all the data beforehand and
then quickly use cached data inside OnDrawCell. Callback
receives 4 arguments: first visible column, first visible row,
number of visible columns, number of visible rows.
*/
type TableView struct {
BaseControl
// own TableView members
topRow int
topCol int
selectedRow int
selectedCol int
columns []Column
rowCount int
fullRowSelect bool
showRowNo bool
showVLines bool
onDrawCell func(*ColumnDrawInfo)
onAction func(TableEvent)
onKeyPress func(term.Key) bool
onSelectCell func(int, int)
onBeforeDraw func(int, int, int, int)
// internal variable to avoid sending onSelectCell twice or more
// in case of current cell is unchanged
lastEventCol int
lastEventRow int
}
// Column is a information about a table column.
// When one sets a column list, it the fields Title
// and Width should be set. All other fields can be
// undefined.
type Column struct {
Title string
Width int
Alignment Align
Fg, Bg term.Attribute
Sort SortOrder
}
// ColumnDrawInfo is a structure used in OnDrawCell event.
// A callback should assign Text field otherwise the cell
// will be empty. In addition to it, the callback can
// change Bg, Fg, and Alignment to display customizes
// info. All other non-mentioned fields are for a user
// convenience and used to describe the cell more detailed,
// changing that fields affects nothing
type ColumnDrawInfo struct {
// row number
Row int
// column number
Col int
// width of the cell
Width int
// cell displayed text
Text string
// text alignment
Alignment Align
// is the row that contains the cell selected(active)
RowSelected bool
// is the column that contains the cell selected(active)
CellSelected bool
// current text color
Fg term.Attribute
// current background color
Bg term.Attribute
}
// TableEvent is structure to describe the common action that a
// TableView ask for while a user is interacting with the table
type TableEvent struct {
// requested action: Add, Edit, Delete, Sort data
Action TableAction
// Currently selected column
Col int
// Currently selected row (it is not used for TableActionSort)
Row int
// Sort order (it is used only in TableActionSort event)
Sort SortOrder
}
/*
CreateTableView creates a new frame.
view - is a View that manages the control
parent - is container that keeps the control. The same View can be a view and a parent at the same time.
width and height - are minimal size of the control.
scale - the way of scaling the control when the parent is resized. Use DoNotScale constant if the
control should keep its original size.
*/
func CreateTableView(parent Control, width, height int, scale int) *TableView {
l := new(TableView)
l.BaseControl = NewBaseControl()
if height == AutoSize {
height = 3
}
if width == AutoSize {
width = 10
}
l.SetSize(width, height)
l.SetConstraints(width, height)
l.selectedCol = 0
l.selectedRow = 0
l.parent = parent
l.columns = make([]Column, 0)
l.SetScale(scale)
l.SetTabStop(true)
l.onDrawCell = nil
l.onAction = nil
l.onKeyPress = nil
l.onSelectCell = nil
l.lastEventCol = -1
l.lastEventRow = -1
if parent != nil {
parent.AddChild(l)
}
return l
}
func (l *TableView) drawHeader() {
PushAttributes()
defer PopAttributes()
fg, bg := RealColor(l.fg, l.Style(), ColorTableHeaderText), RealColor(l.bg, l.Style(), ColorTableHeaderBack)
fgLine := RealColor(l.fg, l.Style(), ColorTableLineText)
x, y := l.Pos()
w, _ := l.Size()
SetTextColor(fg)
SetBackColor(bg)
FillRect(x, y, w, 1, ' ')
parts := []rune(SysObject(ObjTableView))
for i := 0; i < w; i++ {
PutChar(x+i, y+1, parts[0])
}
w-- // scrollbar
dx := 0
if l.showVLines {
dx = 1
}
pos := 0
SetBackColor(bg)
if l.showRowNo {
cW := l.counterWidth()
shift, str := AlignText("#", cW, AlignRight)
SetTextColor(fg)
DrawRawText(x+pos+shift, y, str)
if l.showVLines {
SetTextColor(fgLine)
PutChar(x+pos+cW, y, parts[1])
PutChar(x+pos+cW, y+1, parts[2])
pos++
}
pos = cW + dx
}
idx := l.topCol
for pos < w && idx < len(l.columns) {
w := l.columns[idx].Width
if l.width-1-pos < w {
w = l.width - 1 - pos
}
if w <= 0 {
break
}
dw := 0
if l.columns[idx].Sort != SortNone {
dw = -1
ch := parts[3]
if l.columns[idx].Sort == SortDesc {
ch = parts[4]
}
SetTextColor(fg)
PutChar(x+pos+w-1, y, ch)
}
shift, str := AlignColorizedText(l.columns[idx].Title, w+dw, l.columns[idx].Alignment)
SetTextColor(fg)
DrawText(x+pos+shift, y, str)
pos += w
if l.showVLines && idx < len(l.columns)-1 {
SetTextColor(fgLine)
PutChar(x+pos, y, parts[1])
PutChar(x+pos, y+1, parts[2])
pos++
}
idx++
}
}
func (l *TableView) counterWidth() int {
width := 0
if l.showRowNo {
s := fmt.Sprintf("%v", l.rowCount)
if s == "" {
s = " "
}
width = len(s)
}
return width
}
func (l *TableView) drawScroll() {
pos := ThumbPosition(l.selectedRow, l.rowCount, l.height-1)
DrawScrollBar(l.x+l.width-1, l.y, 1, l.height-1, pos)
pos = ThumbPosition(l.selectedCol, len(l.columns), l.width-1)
DrawScrollBar(l.x, l.y+l.height-1, l.width-1, 1, pos)
PutChar(l.x+l.width-1, l.y+l.height-1, ' ')
}
func (l *TableView) drawCells() {
PushAttributes()
defer PopAttributes()
maxRow := l.rowCount - 1
rowNo := l.topRow
dy := 2
maxDy := l.height - 2
fg, bg := RealColor(l.fg, l.Style(), ColorTableText), RealColor(l.bg, l.Style(), ColorTableBack)
fgRow, bgRow := RealColor(l.fg, l.Style(), ColorTableSelectedText), RealColor(l.bg, l.Style(), ColorTableSelectedBack)
fgCell, bgCell := RealColor(l.fg, l.Style(), ColorTableActiveCellText), RealColor(l.bg, l.Style(), ColorTableActiveCellBack)
fgLine := RealColor(l.fg, l.Style(), ColorTableLineText)
parts := []rune(SysObject(ObjTableView))
start := 0
if l.showRowNo {
start = l.counterWidth()
for idx := 1; idx < l.height-2; idx++ {
if l.topRow+idx > l.rowCount {
break
}
s := fmt.Sprintf("%v", idx+l.topRow)
shift, str := AlignText(s, start, AlignRight)
SetTextColor(fg)
SetBackColor(bg)
DrawText(l.x+shift, l.y+dy+idx-1, str)
if l.showVLines {
SetTextColor(fgLine)
PutChar(l.x+start, l.y+dy+idx-1, parts[1])
}
}
if l.showVLines {
start++
}
}
for rowNo <= maxRow && dy <= maxDy {
colNo := l.topCol
dx := start
for colNo < len(l.columns) && dx < l.width-1 {
c := l.columns[colNo]
info := ColumnDrawInfo{Row: rowNo, Col: colNo, Width: c.Width, Alignment: c.Alignment}
if l.selectedRow == rowNo && l.selectedCol == colNo {
info.RowSelected = true
info.CellSelected = true
info.Bg = bgCell
info.Fg = fgCell
} else if l.selectedRow == rowNo && l.fullRowSelect {
info.RowSelected = true
info.Bg = bgRow
info.Fg = fgRow
} else {
info.Fg = fg
info.Bg = bg
}
if l.onDrawCell != nil {
l.onDrawCell(&info)
}
length := c.Width
if length+dx >= l.width-1 {
length = l.width - 1 - dx
}
SetTextColor(info.Fg)
SetBackColor(info.Bg)
FillRect(l.x+dx, l.y+dy, length, 1, ' ')
shift, text := AlignColorizedText(info.Text, length, info.Alignment)
DrawText(l.x+dx+shift, l.y+dy, text)
dx += c.Width
if l.showVLines && dx < l.width-1 && colNo < len(l.columns)-1 {
SetTextColor(fg)
SetBackColor(bg)
PutChar(l.x+dx, l.y+dy, parts[1])
dx++
}
colNo++
}
rowNo++
dy++
}
}
// Draw repaints the control on its View surface
func (l *TableView) Draw() {
if l.hidden {
return
}
l.mtx.RLock()
defer l.mtx.RUnlock()
PushAttributes()
defer PopAttributes()
x, y := l.Pos()
w, h := l.Size()
if l.onBeforeDraw != nil {
firstCol, firstRow, colCount, rowCount := l.VisibleArea()
l.onBeforeDraw(firstCol, firstRow, colCount, rowCount)
}
bg := RealColor(l.bg, l.Style(), ColorTableBack)
SetBackColor(bg)
FillRect(x, y+2, w, h-2, ' ')
l.drawHeader()
l.drawScroll()
l.drawCells()
}
func (l *TableView) emitSelectionChange() {
if l.lastEventRow == l.selectedRow && l.lastEventCol == l.selectedCol {
return
}
if l.selectedCol != -1 && l.selectedRow != -1 && l.onSelectCell != nil {
l.onSelectCell(l.selectedCol, l.selectedRow)
l.lastEventRow = l.selectedRow
l.lastEventCol = l.selectedCol
}
}
func (l *TableView) home() {
if len(l.columns) > 0 {
l.selectedCol = 0
}
l.topCol = 0
l.EnsureColVisible()
l.emitSelectionChange()
}
func (l *TableView) end() {
length := len(l.columns)
if length == 0 {
return
}
l.selectedCol = length - 1
l.EnsureColVisible()
l.emitSelectionChange()
}
func (l *TableView) firstRow() {
if l.rowCount > 0 {
l.selectedRow = 0
}
l.topRow = 0
l.EnsureRowVisible()
l.emitSelectionChange()
}
func (l *TableView) lastRow() {
if l.rowCount == 0 {
return
}
l.selectedRow = l.rowCount - 1
l.EnsureColVisible()
l.emitSelectionChange()
}
func (l *TableView) moveUp(dy int) {
if l.topRow == 0 && l.selectedRow == 0 {
return
}
if l.selectedRow == -1 {
if l.rowCount != 0 {
l.selectedRow = 0
l.emitSelectionChange()
}
return
}
if l.selectedRow < dy {
l.selectedRow = 0
} else {
l.selectedRow -= dy
}
l.EnsureRowVisible()
l.emitSelectionChange()
}
func (l *TableView) moveDown(dy int) {
length := l.rowCount
if length == 0 || l.selectedRow == length-1 {
return
}
if l.selectedRow+dy >= length {
l.selectedRow = length - 1
} else {
l.selectedRow += dy
}
l.EnsureRowVisible()
l.emitSelectionChange()
}
func (l *TableView) moveRight(dx int) {
colCnt := len(l.columns)
if l.selectedCol == colCnt-1 || colCnt == 0 {
return
}
if l.selectedCol == -1 {
l.selectedCol = 0
} else {
if l.selectedCol+dx >= colCnt {
l.selectedCol = colCnt - 1
} else {
l.selectedCol += dx
}
}
l.EnsureColVisible()
l.emitSelectionChange()
}
func (l *TableView) moveLeft(dx int) {
colCnt := len(l.columns)
if l.selectedCol == 0 || colCnt == 0 {
return
}
if l.selectedCol == -1 {
l.selectedCol = 0
} else {
if l.selectedCol-dx < 0 {
l.selectedCol = 0
} else {
l.selectedCol -= dx
}
}
l.EnsureColVisible()
l.emitSelectionChange()
}
func (l *TableView) isColVisible(idx int) bool {
if idx < l.topCol {
return false
}
width := l.width - 1
width -= l.counterWidth()
if l.showVLines && l.showRowNo {
width--
}
for i := l.topCol; i < len(l.columns); i++ {
if i == idx && l.columns[i].Width <= width {
return true
}
width -= l.columns[i].Width
}
return false
}
// EnsureColVisible scrolls the table horizontally
// to make the currently selected column fully visible
func (l *TableView) EnsureColVisible() {
if l.isColVisible(l.selectedCol) {
return
}
if l.selectedCol < l.topCol {
l.topCol = l.selectedCol
return
}
width := l.width - 1 - l.counterWidth()
if l.showRowNo && l.showVLines {
width--
}
toShow := l.selectedCol
for width > 0 {
if l.columns[toShow].Width > width {
if toShow == l.selectedCol {
break
} else {
toShow++
break
}
} else if l.columns[toShow].Width == width {
break
} else {
width -= l.columns[toShow].Width
if width < 0 {
break
}
toShow--
if toShow == 0 {
break
}
}
}
l.topCol = toShow
}
// EnsureRowVisible scrolls the table vertically
// to make the currently selected row visible
func (l *TableView) EnsureRowVisible() {
length := l.rowCount
hgt := l.height - 3
if length <= hgt || l.selectedRow == -1 {
return
}
diff := l.selectedRow - l.topRow
if diff >= 0 && diff < hgt {
return
}
if diff < 0 {
l.topRow = l.selectedRow
} else {
top := l.selectedRow - hgt + 1
if length-top > hgt {
l.topRow = top
} else {
l.topRow = length - hgt
}
}
}
func (l *TableView) mouseToCol(dx int) int {
shift := l.counterWidth()
if l.showVLines {
shift++
}
if dx < shift {
return -1
}
idx := l.topCol
selectedCol := l.selectedCol
for {
if shift+l.columns[idx].Width > dx {
selectedCol = idx
break
}
if idx == len(l.columns)-1 {
selectedCol = idx
break
}
shift += l.columns[idx].Width
if l.showVLines {
shift++
}
idx++
}
return selectedCol
}
func (l *TableView) horizontalScrollClick(dx int) {
if dx == 0 {
l.moveLeft(1)
return
} else if dx == l.width-2 {
l.moveRight(1)
} else if dx > 0 && dx < l.width-2 {
pos := ThumbPosition(l.selectedCol, len(l.columns), l.width-1)
if pos < dx {
l.moveRight(1)
} else if pos > dx {
l.moveLeft(1)
}
}
}
func (l *TableView) verticalScrollClick(dy int) {
if dy == 0 {
l.moveUp(1)
return
} else if dy == l.height-2 {
l.moveDown(1)
} else if dy > 0 && dy < l.height-2 {
pos := ThumbPosition(l.selectedRow, l.rowCount, l.height-1)
if pos > dy {
l.moveUp(l.height - 3)
} else if pos < dy {
l.moveDown(l.height - 3)
}
}
}
func (l *TableView) processMouseClick(ev Event) bool {
if ev.Key != term.MouseLeft {
return false
}
dx := ev.X - l.x
dy := ev.Y - l.y
if l.topRow+dy-2 >= l.rowCount && dy != l.height-1 && dx != l.width-1 {
return false
}
if dy == l.height-1 && dx == l.width-1 {
l.selectedRow = l.rowCount - 1
l.selectedCol = len(l.columns) - 1
return true
}
if dy == l.height-1 {
l.horizontalScrollClick(dx)
return true
}
if dx == l.width-1 {
l.verticalScrollClick(dy)
return true
}
if dy < 2 {
l.headerClicked(dx)
return true
}
dy -= 2
newRow := l.topRow + dy
newCol := l.mouseToCol(dx)
if newCol == -1 && newRow != l.selectedRow {
l.selectedRow = newRow
l.EnsureColVisible()
l.emitSelectionChange()
} else if newCol != -1 && (newCol != l.selectedCol || newRow != l.selectedRow) {
l.selectedCol = newCol
l.selectedRow = newRow
l.EnsureColVisible()
l.emitSelectionChange()
}
return true
}
func (l *TableView) headerClicked(dx int) {
colID := l.mouseToCol(dx)
if colID == -1 {
if l.onAction != nil {
ev := TableEvent{Action: TableActionSort, Col: -1, Row: -1}
l.onAction(ev)
}
} else {
sort := l.columns[colID].Sort
for idx := range l.columns {
l.columns[idx].Sort = SortNone
}
if sort == SortAsc {
sort = SortDesc
} else if sort == SortNone {
sort = SortAsc
} else {
sort = SortNone
}
l.columns[colID].Sort = sort
if l.onAction != nil {
ev := TableEvent{Action: TableActionSort, Col: colID, Row: -1, Sort: sort}
l.onAction(ev)
}
}
}
/*
ProcessEvent processes all events come from the control parent. If a control
processes an event it should return true. If the method returns false it means
that the control do not want or cannot process the event and the caller sends
the event to the control parent
*/
func (l *TableView) ProcessEvent(event Event) bool {
if !l.Active() || !l.Enabled() {
return false
}
switch event.Type {
case EventKey:
if l.onKeyPress != nil {
res := l.onKeyPress(event.Key)
if res {
return true
}
}
switch event.Key {
case term.KeyHome:
if event.Mod == term.ModAlt {
l.selectedRow = 0
l.EnsureRowVisible()
l.emitSelectionChange()
} else {
l.home()
}
return true
case term.KeyEnd:
if event.Mod == term.ModAlt {
l.selectedRow = l.rowCount - 1
l.EnsureRowVisible()
l.emitSelectionChange()
} else {
l.end()
}
return true
case term.KeyArrowUp:
l.moveUp(1)
return true
case term.KeyArrowDown:
l.moveDown(1)
return true
case term.KeyArrowLeft:
l.moveLeft(1)
return true
case term.KeyArrowRight:
l.moveRight(1)
return true
case term.KeyPgdn:
l.moveDown(l.height - 3)
return true
case term.KeyPgup:
l.moveUp(l.height - 3)
return true
case term.KeyCtrlM, term.KeyF2:
if l.selectedRow != -1 && l.selectedCol != -1 && l.onAction != nil {
ev := TableEvent{Action: TableActionEdit, Col: l.selectedCol, Row: l.selectedRow}
l.onAction(ev)
}
case term.KeyDelete:
if l.selectedRow != -1 && l.onAction != nil {
ev := TableEvent{Action: TableActionDelete, Col: l.selectedCol, Row: l.selectedRow}
l.onAction(ev)
}
case term.KeyInsert:
if l.onAction != nil {
ev := TableEvent{Action: TableActionNew, Col: l.selectedCol, Row: l.selectedRow}
l.onAction(ev)
}
case term.KeyF4:
if l.onAction != nil {
colID := l.selectedCol
sort := l.columns[colID].Sort
for idx := range l.columns {
l.columns[idx].Sort = SortNone
}
if sort == SortAsc {
sort = SortDesc
} else if sort == SortNone {
sort = SortAsc
} else {
sort = SortNone
}
l.columns[colID].Sort = sort
ev := TableEvent{Action: TableActionSort, Col: colID, Row: -1, Sort: sort}
l.onAction(ev)
}
default:
return false
}
case EventMouse:
return l.processMouseClick(event)
}
return false
}
// own methods
// ShowLines returns true if table displays vertical
// lines to separate columns
func (l *TableView) ShowLines() bool {
return l.showVLines
}
// SetShowLines disables and enables displaying vertical
// lines inside TableView
func (l *TableView) SetShowLines(show bool) {
l.showVLines = show
}
// ShowRowNumber returns true if the table shows the
// row number as the first table column. This virtual
// column is always fixed and a user cannot change
// displayed text
func (l *TableView) ShowRowNumber() bool {
return l.showRowNo
}
// SetShowRowNumber turns on and off the first fixed
// column of the table that displays the row number
func (l *TableView) SetShowRowNumber(show bool) {
l.showRowNo = show
}
// Columns returns the current list of table columns
func (l *TableView) Columns() []Column {
c := make([]Column, len(l.columns))
copy(c, l.columns)
return c
}
// SetColumns replaces existing table column list with
// a new one. Be sure that every item has correct
// Title and Width, all other column properties may
// be undefined
func (l *TableView) SetColumns(cols []Column) {
l.columns = cols
}
// SetColumnInfo replaces the existing column info
func (l *TableView) SetColumnInfo(id int, col Column) {
if id < len(l.columns) {
l.columns[id] = col
}
}
// RowCount returns current row count
func (l *TableView) RowCount() int {
return l.rowCount
}
// SetRowCount sets the new row count
func (l *TableView) SetRowCount(count int) {
l.rowCount = count
}
// FullRowSelect returns if TableView hilites the selected
// cell only or the whole row that contains the selected
// cell. By default the colors for selected row and cell
// are different
func (l *TableView) FullRowSelect() bool {
return l.fullRowSelect
}
// SetFullRowSelect enables or disables hiliting of the
// full row that contains the selected cell
func (l *TableView) SetFullRowSelect(fullRow bool) {
l.fullRowSelect = fullRow
}
// OnSelectCell sets a callback that is called every time
// the selected cell is changed
func (l *TableView) OnSelectCell(fn func(int, int)) {
l.onSelectCell = fn
}
// OnKeyPress sets the callback that is called when a user presses a Key while
// the controls is active. If a handler processes the key it should return
// true. If handler returns false it means that the default handler has to
// process the key
func (l *TableView) OnKeyPress(fn func(term.Key) bool) {
l.onKeyPress = fn
}
// OnDrawCell is called every time the table is going to display
// a cell
func (l *TableView) OnDrawCell(fn func(*ColumnDrawInfo)) {
l.mtx.Lock()
l.onDrawCell = fn
l.mtx.Unlock()
}
// OnAction is called when the table wants a user application to
// do some job like add, delete, edit or sort data
func (l *TableView) OnAction(fn func(TableEvent)) {
l.onAction = fn
}
// SelectedRow returns currently selected row number or
// -1 if no row is selected
func (l *TableView) SelectedRow() int {
return l.selectedRow
}
// SelectedCol returns currently selected column number or
// -1 if no column is selected
func (l *TableView) SelectedCol() int {
return l.selectedCol
}
// SetSelectedRow changes the currently selected row.
// If row is greater than number of row the last row
// is selected. Set row to -1 to turn off selection.
// The table scrolls automatically to display the column
func (l *TableView) SetSelectedRow(row int) {
oldSelection := l.selectedRow
if row >= l.rowCount {
l.selectedRow = l.rowCount - 1
} else if row < -1 {
l.selectedRow = -1
} else {
l.selectedRow = row
}
if l.selectedRow != oldSelection {
l.EnsureRowVisible()
l.emitSelectionChange()
}
}
// SetSelectedCol changes the currently selected column.
// If column is greater than number of columns the last
// column is selected. Set row to -1 to turn off selection.
// The table scrolls automatically to display the column
func (l *TableView) SetSelectedCol(col int) {
oldSelection := l.selectedCol
if col >= len(l.columns) {
l.selectedCol = len(l.columns) - 1
} else if col < -1 {
l.selectedCol = -1