156 lines
3.6 KiB
Go
156 lines
3.6 KiB
Go
package views
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import "git.tordarus.net/Tordarus/tui"
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// BorderView is a tui.Wrapper which draws an ASCII border around its view.
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// Be aware that box drawing characters must share the same tui.Style with the next character.
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// This can lead to color artifacts when using BorderView with colored styles.
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type BorderView struct {
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tui.WrapperTmpl
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Border BorderBox
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ShowBorder map[tui.Side]bool
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}
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var _ tui.Wrapper = &BorderView{}
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// NewBorderView create a new BorderView which show borders on the given sides around its view.
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// If no sides are given, all sides will have a border by default
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func NewBorderView(view tui.View, showBorders ...tui.Side) *BorderView {
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v := new(BorderView)
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v.SetView(view)
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v.Border = ThinBorder()
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if len(showBorders) == 0 {
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v.ShowBorder = map[tui.Side]bool{
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tui.SideBottom: true,
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tui.SideTop: true,
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tui.SideLeft: true,
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tui.SideRight: true,
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}
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} else {
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v.ShowBorder = map[tui.Side]bool{}
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for _, border := range showBorders {
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v.ShowBorder[border] = true
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}
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}
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return v
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}
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func (g *BorderView) Draw(buf *tui.ViewBuffer) {
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viewbuf := buf
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// limit view buffer for child view
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if g.ShowBorder[tui.SideTop] {
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viewbuf = viewbuf.Sub(0, 1, viewbuf.Width(), viewbuf.Height())
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}
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if g.ShowBorder[tui.SideBottom] {
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viewbuf = viewbuf.Sub(0, 0, viewbuf.Width(), viewbuf.Height()-1)
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}
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if g.ShowBorder[tui.SideLeft] {
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viewbuf = viewbuf.Sub(1, 0, viewbuf.Width(), viewbuf.Height())
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}
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if g.ShowBorder[tui.SideRight] {
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viewbuf = viewbuf.Sub(0, 0, viewbuf.Width()-1, viewbuf.Height())
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}
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// draw child view
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g.View().Draw(viewbuf)
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// draw horizontal lines
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for x := 0; x < buf.Width(); x++ {
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if g.ShowBorder[tui.SideTop] {
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buf.Set(x, 0, tui.Rune{Rn: g.Border.Horizontal, Style: g.Style()})
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}
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if g.ShowBorder[tui.SideBottom] {
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buf.Set(x, buf.Height()-1, tui.Rune{Rn: g.Border.Horizontal, Style: g.Style()})
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}
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}
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// draw vertical lines
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for y := 0; y < buf.Height(); y++ {
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if g.ShowBorder[tui.SideLeft] {
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buf.Set(0, y, tui.Rune{Rn: g.Border.Vertical, Style: g.Style()})
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}
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if g.ShowBorder[tui.SideRight] {
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buf.Set(buf.Width()-1, y, tui.Rune{Rn: g.Border.Vertical, Style: g.Style()})
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}
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}
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// draw corners
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if g.ShowBorder[tui.SideTop] {
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if g.ShowBorder[tui.SideLeft] {
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buf.Set(0, 0, tui.Rune{Rn: g.Border.TopLeft, Style: g.Style()})
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}
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if g.ShowBorder[tui.SideRight] {
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buf.Set(buf.Width()-1, 0, tui.Rune{Rn: g.Border.TopRight, Style: g.Style()})
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}
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}
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if g.ShowBorder[tui.SideBottom] {
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if g.ShowBorder[tui.SideLeft] {
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buf.Set(0, buf.Height()-1, tui.Rune{Rn: g.Border.BottomLeft, Style: g.Style()})
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}
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if g.ShowBorder[tui.SideRight] {
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buf.Set(buf.Width()-1, buf.Height()-1, tui.Rune{Rn: g.Border.BottomRight, Style: g.Style()})
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}
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}
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}
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func (v *BorderView) Layout() (prefWidth, prefHeight int) {
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w, h := v.View().Layout()
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for side, border := range v.ShowBorder {
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if border {
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if side.Horizontal() {
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w++
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} else if side.Vertical() {
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h++
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}
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}
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}
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return w, h
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}
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type BorderBox struct {
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TopLeft rune
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TopRight rune
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BottomLeft rune
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BottomRight rune
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Horizontal rune
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Vertical rune
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}
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func ThickBorder() BorderBox {
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return BorderBox{
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TopLeft: '┏',
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TopRight: '┓',
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BottomLeft: '┗',
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BottomRight: '┛',
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Horizontal: '━',
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Vertical: '┃',
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}
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}
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func ThinBorder() BorderBox {
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return BorderBox{
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TopLeft: '┌',
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TopRight: '┐',
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BottomLeft: '└',
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BottomRight: '┘',
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Horizontal: '─',
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Vertical: '│',
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}
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}
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func DoubleBorder() BorderBox {
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return BorderBox{
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TopLeft: '╔',
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TopRight: '╗',
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BottomLeft: '╚',
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BottomRight: '╝',
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Horizontal: '═',
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Vertical: '║',
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}
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}
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