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Improved table navigation.

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This commit is contained in:
Oliver 2017-12-29 22:27:10 +01:00
parent 42fa258a5e
commit 7dc0dace25
3 changed files with 105 additions and 10 deletions
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2
demos/table/main.go
View File

@ -28,7 +28,7 @@ func main() {
word = (word + 1) % len(lorem)
}
}
table.SetSelected(0, 0).SetFixed(1, 1).SetDoneFunc(func(key tcell.Key) {
table.Select(0, 0).SetFixed(1, 1).SetDoneFunc(func(key tcell.Key) {
if key == tcell.KeyEscape {
app.Stop()
}

5
list.go
View File

@ -103,8 +103,9 @@ func (l *List) ShowSecondaryText(show bool) *List {
}
// SetSelectedFunc sets the function which is called when the user selects a
// list item. The function receives the item's index in the list of items
// (starting with 0), its main text, secondary text, and its shortcut rune.
// list item by pressing Enter on the current selection. The function receives
// the item's index in the list of items (starting with 0), its main text,
// secondary text, and its shortcut rune.
func (l *List) SetSelectedFunc(handler func(int, string, string, rune)) *List {
l.selected = handler
return l

108
table.go
View File

@ -21,8 +21,8 @@ type TableCell struct {
// The color of the cell text.
Color tcell.Color
// Whether or not this cell may be selected.
Selectable bool
// If set to true, this cell cannot be selected.
NotSelectable bool
// The position and width of the cell the last time table was drawn.
x, y, width int
@ -138,7 +138,6 @@ func NewTable() *Table {
Box: NewBox(),
bordersColor: tcell.ColorWhite,
separator: ' ',
trackEnd: true,
lastColumn: -1,
}
}
@ -195,10 +194,10 @@ func (t *Table) SetSelectable(rows, columns bool) *Table {
return t
}
// SetSelected sets the selected cell. Depending on the selection settings
// Select sets the selected cell. Depending on the selection settings
// specified via SetSelectable(), this may be an entire row or column, or even
// ignored completely.
func (t *Table) SetSelected(row, column int) *Table {
func (t *Table) Select(row, column int) *Table {
t.selectedRow, t.selectedColumn = row, column
return t
}
@ -268,6 +267,27 @@ func (t *Table) GetCell(row, column int) *TableCell {
return t.cells[row][column]
}
// ScrollToBeginning scrolls the table to the beginning to that the top left
// corner of the table is shown. Note that this position may be corrected if
// there is a selection.
func (t *Table) ScrollToBeginning() *Table {
t.trackEnd = false
t.columnOffset = 0
t.rowOffset = 0
return t
}
// ScrollToEnd scrolls the table to the beginning to that the bottom left corner
// of the table is shown. Adding more rows to the table will cause it to
// automatically scroll with the new data. Note that this position may be
// corrected if there is a selection.
func (t *Table) ScrollToEnd() *Table {
t.trackEnd = true
t.columnOffset = 0
t.rowOffset = len(t.cells)
return t
}
// Draw draws this primitive onto the screen.
func (t *Table) Draw(screen tcell.Screen) {
t.Box.Draw(screen)
@ -282,12 +302,33 @@ func (t *Table) Draw(screen tcell.Screen) {
// Return the cell at the specified position (nil if it doesn't exist).
getCell := func(row, column int) *TableCell {
if row >= len(t.cells) || column >= len(t.cells[row]) {
if row < 0 || column < 0 || row >= len(t.cells) || column >= len(t.cells[row]) {
return nil
}
return t.cells[row][column]
}
// If this cell is not selectable, find the next one.
if t.rowsSelectable || t.columnsSelectable {
if t.selectedColumn < 0 {
t.selectedColumn = 0
}
if t.selectedRow < 0 {
t.selectedRow = 0
}
for t.selectedRow < len(t.cells) {
cell := getCell(t.selectedRow, t.selectedColumn)
if cell == nil || !cell.NotSelectable {
break
}
t.selectedColumn++
if t.selectedColumn > t.lastColumn {
t.selectedColumn = 0
t.selectedRow++
}
}
}
// Clamp row offsets.
if t.rowsSelectable {
if t.selectedRow >= t.fixedRows && t.selectedRow < t.fixedRows+t.rowOffset {
@ -480,7 +521,7 @@ ColumnLoop:
// Determine colors.
bgColor := t.backgroundColor
textColor := cell.Color
if cellSelected {
if cellSelected && !cell.NotSelectable {
bgColor = cell.Color
textColor = t.backgroundColor
}
@ -556,10 +597,56 @@ func (t *Table) InputHandler() func(event *tcell.EventKey, setFocus func(p Primi
// Movement functions.
var (
getCell = func(row, column int) *TableCell {
if row < 0 || column < 0 || row >= len(t.cells) || column >= len(t.cells[row]) {
return nil
}
return t.cells[row][column]
}
previous = func() {
for t.selectedRow >= 0 {
cell := getCell(t.selectedRow, t.selectedColumn)
if cell == nil || !cell.NotSelectable {
return
}
t.selectedColumn--
if t.selectedColumn < 0 {
t.selectedColumn = t.lastColumn
t.selectedRow--
}
}
}
next = func() {
if t.selectedColumn > t.lastColumn {
t.selectedColumn = 0
t.selectedRow++
if t.selectedRow >= len(t.cells) {
t.selectedRow = len(t.cells) - 1
}
}
for t.selectedRow < len(t.cells) {
cell := getCell(t.selectedRow, t.selectedColumn)
if cell == nil || !cell.NotSelectable {
return
}
t.selectedColumn++
if t.selectedColumn > t.lastColumn {
t.selectedColumn = 0
t.selectedRow++
}
}
t.selectedColumn = t.lastColumn
t.selectedRow = len(t.cells) - 1
previous()
}
home = func() {
if t.rowsSelectable {
t.selectedRow = 0
t.selectedColumn = 0
next()
} else {
t.trackEnd = false
t.rowOffset = 0
@ -571,6 +658,7 @@ func (t *Table) InputHandler() func(event *tcell.EventKey, setFocus func(p Primi
if t.rowsSelectable {
t.selectedRow = len(t.cells) - 1
t.selectedColumn = t.lastColumn
previous()
} else {
t.trackEnd = true
t.columnOffset = 0
@ -583,6 +671,7 @@ func (t *Table) InputHandler() func(event *tcell.EventKey, setFocus func(p Primi
if t.selectedRow >= len(t.cells) {
t.selectedRow = len(t.cells) - 1
}
next()
} else {
t.rowOffset++
}
@ -594,6 +683,7 @@ func (t *Table) InputHandler() func(event *tcell.EventKey, setFocus func(p Primi
if t.selectedRow < 0 {
t.selectedRow = 0
}
previous()
} else {
t.trackEnd = false
t.rowOffset--
@ -606,6 +696,7 @@ func (t *Table) InputHandler() func(event *tcell.EventKey, setFocus func(p Primi
if t.selectedColumn < 0 {
t.selectedColumn = 0
}
previous()
} else {
t.columnOffset--
}
@ -617,6 +708,7 @@ func (t *Table) InputHandler() func(event *tcell.EventKey, setFocus func(p Primi
if t.selectedColumn > t.lastColumn {
t.selectedColumn = t.lastColumn
}
next()
} else {
t.columnOffset++
}
@ -628,6 +720,7 @@ func (t *Table) InputHandler() func(event *tcell.EventKey, setFocus func(p Primi
if t.selectedRow >= len(t.cells) {
t.selectedRow = len(t.cells) - 1
}
next()
} else {
t.rowOffset += t.visibleRows
}
@ -639,6 +732,7 @@ func (t *Table) InputHandler() func(event *tcell.EventKey, setFocus func(p Primi
if t.selectedRow < 0 {
t.selectedRow = 0
}
previous()
} else {
t.trackEnd = false
t.rowOffset -= t.visibleRows