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TopRow must be public in order to calculate which line of the list is under the cursor. #243

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TopRow must be public in order to calculate which line of the list is under the cursor. #243

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15 changes: 13 additions & 2 deletions _examples/list.go
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Original file line number Diff line number Diff line change
Expand Up @@ -46,9 +46,20 @@ func main() {
switch e.ID {
case "q", "<C-c>":
return
case "j", "<Down>":
case "<MouseLeft>":
payload := e.Payload.(ui.Mouse)
border := 0
if l.BorderTop {
border = 1
}
x0, y0 := l.Inner.Min.X, l.Inner.Min.Y
x1, y1 := l.Inner.Max.X, l.Inner.Max.Y
if x0 < payload.X && payload.X < x1 && y0 < payload.Y && payload.Y < y1 {
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l.SelectedRow = payload.Y - l.Rectangle.Min.Y - border + l.TopRow
}
case "j", "<Down>", "<MouseWheelDown>":
l.ScrollDown()
case "k", "<Up>":
case "k", "<Up>", "<MouseWheelUp>":
l.ScrollUp()
case "<C-d>":
l.ScrollHalfPageDown()
Expand Down
24 changes: 12 additions & 12 deletions v3/widgets/list.go
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Original file line number Diff line number Diff line change
Expand Up @@ -18,7 +18,7 @@ type List struct {
WrapText bool
TextStyle Style
SelectedRow int
topRow int
TopRow int
SelectedRowStyle Style
}

Expand All @@ -36,14 +36,14 @@ func (self *List) Draw(buf *Buffer) {
point := self.Inner.Min

// adjusts view into widget
if self.SelectedRow >= self.Inner.Dy()+self.topRow {
self.topRow = self.SelectedRow - self.Inner.Dy() + 1
} else if self.SelectedRow < self.topRow {
self.topRow = self.SelectedRow
if self.SelectedRow >= self.Inner.Dy()+self.TopRow {
self.TopRow = self.SelectedRow - self.Inner.Dy() + 1
} else if self.SelectedRow < self.TopRow {
self.TopRow = self.SelectedRow
}

// draw rows
for row := self.topRow; row < len(self.Rows) && point.Y < self.Inner.Max.Y; row++ {
for row := self.TopRow; row < len(self.Rows) && point.Y < self.Inner.Max.Y; row++ {
cells := ParseStyles(self.Rows[row], self.TextStyle)
if self.WrapText {
cells = WrapCells(cells, uint(self.Inner.Dx()))
Expand All @@ -69,15 +69,15 @@ func (self *List) Draw(buf *Buffer) {
}

// draw UP_ARROW if needed
if self.topRow > 0 {
if self.TopRow > 0 {
buf.SetCell(
NewCell(UP_ARROW, NewStyle(ColorWhite)),
image.Pt(self.Inner.Max.X-1, self.Inner.Min.Y),
)
}

// draw DOWN_ARROW if needed
if len(self.Rows) > int(self.topRow)+self.Inner.Dy() {
if len(self.Rows) > int(self.TopRow)+self.Inner.Dy() {
buf.SetCell(
NewCell(DOWN_ARROW, NewStyle(ColorWhite)),
image.Pt(self.Inner.Max.X-1, self.Inner.Max.Y-1),
Expand All @@ -86,8 +86,8 @@ func (self *List) Draw(buf *Buffer) {
}

// ScrollAmount scrolls by amount given. If amount is < 0, then scroll up.
// There is no need to set self.topRow, as this will be set automatically when drawn,
// since if the selected item is off screen then the topRow variable will change accordingly.
// There is no need to set self.TopRow, as this will be set automatically when drawn,
// since if the selected item is off screen then the TopRow variable will change accordingly.
func (self *List) ScrollAmount(amount int) {
if len(self.Rows)-int(self.SelectedRow) <= amount {
self.SelectedRow = len(self.Rows) - 1
Expand All @@ -108,8 +108,8 @@ func (self *List) ScrollDown() {

func (self *List) ScrollPageUp() {
// If an item is selected below top row, then go to the top row.
if self.SelectedRow > self.topRow {
self.SelectedRow = self.topRow
if self.SelectedRow > self.TopRow {
self.SelectedRow = self.TopRow
} else {
self.ScrollAmount(-self.Inner.Dy())
}
Expand Down