133 lines
3.3 KiB
Go
133 lines
3.3 KiB
Go
// Copyright 2017 Zack Guo <zack.y.guo@gmail.com>. All rights reserved.
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// Use of this source code is governed by a MIT license that can
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// be found in the LICENSE file.
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package widgets
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import (
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"image"
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. "github.com/gizak/termui"
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rw "github.com/mattn/go-runewidth"
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)
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type List struct {
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Block
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Rows []string
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WrapText bool
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TextStyle Style
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SelectedRow uint
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topRow uint
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SelectedRowStyle Style
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}
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func NewList() *List {
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return &List{
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Block: *NewBlock(),
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TextStyle: Theme.List.Text,
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SelectedRowStyle: Theme.List.Text,
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}
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}
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func (self *List) Draw(buf *Buffer) {
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self.Block.Draw(buf)
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point := self.Inner.Min
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if self.SelectedRow >= uint(self.Inner.Max.Y)+self.topRow-2 {
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self.topRow = self.SelectedRow - uint(self.Inner.Max.Y) + 2
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} else if self.SelectedRow < self.topRow {
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self.topRow = self.SelectedRow
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}
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for row := self.topRow; row < uint(len(self.Rows)) && point.Y < self.Inner.Max.Y; row++ {
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cells := ParseText(self.Rows[row], self.TextStyle)
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if self.WrapText {
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cells = WrapCells(cells, uint(self.Inner.Dx()))
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}
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for j := 0; j < len(cells) && point.Y < self.Inner.Max.Y; j++ {
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style := cells[j].Style
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if row == self.SelectedRow {
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style = self.SelectedRowStyle
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}
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if cells[j].Rune == '\n' {
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point = image.Pt(self.Inner.Min.X, point.Y+1)
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} else {
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if point.X+1 == self.Inner.Max.X+1 && len(cells) > self.Inner.Dx() {
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buf.SetCell(NewCell(ELLIPSES, style), point.Add(image.Pt(-1, 0)))
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break
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} else {
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buf.SetCell(NewCell(cells[j].Rune, style), point)
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point = point.Add(image.Pt(rw.RuneWidth(cells[j].Rune), 0))
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}
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}
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}
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point = image.Pt(self.Inner.Min.X, point.Y+1)
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}
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if self.topRow > 0 {
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buf.SetCell(
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NewCell(UP_ARROW, NewStyle(ColorWhite)),
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image.Pt(self.Inner.Max.X-1, self.Inner.Min.Y),
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)
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}
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if len(self.Rows) > int(self.topRow)+self.Inner.Dy() {
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buf.SetCell(
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NewCell(DOWN_ARROW, NewStyle(ColorWhite)),
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image.Pt(self.Inner.Max.X-1, self.Inner.Max.Y-1),
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)
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}
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}
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// ScrollAmount scrolls by amount given. If amount is < 0, then scroll up.
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// There is no need to set self.topRow, as this will be set automatically when drawn,
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// since if the selected item is off screen then the topRow variable will change accordingly.
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func (self *List) ScrollAmount(amount int) {
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if len(self.Rows)-int(self.SelectedRow) <= amount {
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self.SelectedRow = uint(len(self.Rows) - 1)
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} else if int(self.SelectedRow)+amount < 0 {
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self.SelectedRow = 0
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} else {
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self.SelectedRow += uint(amount)
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}
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}
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func (self *List) ScrollUp() {
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self.ScrollAmount(-1)
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}
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func (self *List) ScrollDown() {
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self.ScrollAmount(1)
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}
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// PageUp scrolls up one whole page.
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func (self *List) PageUp() {
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// If an item is selected below top row, then go to the top row.
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if self.SelectedRow > self.topRow {
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self.SelectedRow = self.topRow
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} else {
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self.ScrollAmount(-self.Inner.Dy())
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}
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}
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// PageDown scolls down one whole page.
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func (self *List) PageDown() {
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self.ScrollAmount(self.Inner.Dy())
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}
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func (self *List) HalfPageUp() {
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self.ScrollAmount(-int(FloorFloat64(float64(self.Inner.Dy()) / 2)))
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}
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func (self *List) HalfPageDown() {
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self.ScrollAmount(int(FloorFloat64(float64(self.Inner.Dy()) / 2)))
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}
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func (self *List) ScrollTop() {
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self.SelectedRow = 0
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}
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func (self *List) ScrollBottom() {
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self.SelectedRow = uint(len(self.Rows) - 1)
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}
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