137 lines
3.3 KiB
Go
137 lines
3.3 KiB
Go
// Copyright 2017 Zack Guo <zack.y.guo@gmail.com>. All rights reserved.
|
|
// Use of this source code is governed by a MIT license that can
|
|
// be found in the LICENSE file.
|
|
|
|
package widgets
|
|
|
|
import (
|
|
"image"
|
|
|
|
rw "github.com/mattn/go-runewidth"
|
|
|
|
. "github.com/gizak/termui/v3"
|
|
)
|
|
|
|
type List struct {
|
|
Block
|
|
Rows []string
|
|
WrapText bool
|
|
TextStyle Style
|
|
SelectedRow int
|
|
topRow int
|
|
SelectedRowStyle Style
|
|
}
|
|
|
|
func NewList() *List {
|
|
return &List{
|
|
Block: *NewBlock(),
|
|
TextStyle: Theme.List.Text,
|
|
SelectedRowStyle: Theme.List.Text,
|
|
}
|
|
}
|
|
|
|
func (self *List) Draw(buf *Buffer) {
|
|
self.Block.Draw(buf)
|
|
|
|
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
|
|
}
|
|
|
|
// draw rows
|
|
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()))
|
|
}
|
|
for j := 0; j < len(cells) && point.Y < self.Inner.Max.Y; j++ {
|
|
style := cells[j].Style
|
|
if row == self.SelectedRow {
|
|
style = self.SelectedRowStyle
|
|
}
|
|
if cells[j].Rune == '\n' {
|
|
point = image.Pt(self.Inner.Min.X, point.Y+1)
|
|
} else {
|
|
if point.X+1 == self.Inner.Max.X+1 && len(cells) > self.Inner.Dx() {
|
|
buf.SetCell(NewCell(ELLIPSES, style), point.Add(image.Pt(-1, 0)))
|
|
break
|
|
} else {
|
|
buf.SetCell(NewCell(cells[j].Rune, style), point)
|
|
point = point.Add(image.Pt(rw.RuneWidth(cells[j].Rune), 0))
|
|
}
|
|
}
|
|
}
|
|
point = image.Pt(self.Inner.Min.X, point.Y+1)
|
|
}
|
|
|
|
// draw UP_ARROW if needed
|
|
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() {
|
|
buf.SetCell(
|
|
NewCell(DOWN_ARROW, NewStyle(ColorWhite)),
|
|
image.Pt(self.Inner.Max.X-1, self.Inner.Max.Y-1),
|
|
)
|
|
}
|
|
}
|
|
|
|
// 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.
|
|
func (self *List) ScrollAmount(amount int) {
|
|
if len(self.Rows)-int(self.SelectedRow) <= amount {
|
|
self.SelectedRow = len(self.Rows) - 1
|
|
} else if int(self.SelectedRow)+amount < 0 {
|
|
self.SelectedRow = 0
|
|
} else {
|
|
self.SelectedRow += amount
|
|
}
|
|
}
|
|
|
|
func (self *List) ScrollUp() {
|
|
self.ScrollAmount(-1)
|
|
}
|
|
|
|
func (self *List) ScrollDown() {
|
|
self.ScrollAmount(1)
|
|
}
|
|
|
|
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
|
|
} else {
|
|
self.ScrollAmount(-self.Inner.Dy())
|
|
}
|
|
}
|
|
|
|
func (self *List) ScrollPageDown() {
|
|
self.ScrollAmount(self.Inner.Dy())
|
|
}
|
|
|
|
func (self *List) ScrollHalfPageUp() {
|
|
self.ScrollAmount(-int(FloorFloat64(float64(self.Inner.Dy()) / 2)))
|
|
}
|
|
|
|
func (self *List) ScrollHalfPageDown() {
|
|
self.ScrollAmount(int(FloorFloat64(float64(self.Inner.Dy()) / 2)))
|
|
}
|
|
|
|
func (self *List) ScrollTop() {
|
|
self.SelectedRow = 0
|
|
}
|
|
|
|
func (self *List) ScrollBottom() {
|
|
self.SelectedRow = len(self.Rows) - 1
|
|
}
|