599 lines
12 KiB
Go
599 lines
12 KiB
Go
package ui
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import (
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"strconv"
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"strings"
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"git.yetaga.in/alazyreader/library/book"
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"github.com/gdamore/tcell"
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)
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type Drawable interface {
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Draw(tcell.Screen)
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SetSize(x, y, h, w int)
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SetStyle(tcell.Style)
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SetVisible(bool)
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}
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type Offsets struct {
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Top int
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Bottom int
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Left int
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Right int
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Percent int
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}
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type Contents []struct {
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Offsets Offsets
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Container Drawable
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}
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const (
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LayoutUnmanaged = iota
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LayoutHorizontalEven
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LayoutVerticalEven
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LayoutHorizontalPercent
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LayoutVerticalPercent
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)
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var (
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StyleActive = tcell.Style(0).Foreground(tcell.ColorWhite).Background(tcell.ColorBlack)
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StyleInactive = tcell.Style(0).Foreground(tcell.ColorGray).Background(tcell.ColorBlack)
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)
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// A Container has no visible UI of its own, but arranges sub-components on the screen.
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// layoutMethod manages how subcomponents are organized. If `LayoutUnmanaged`, it just uses the offsets
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// in contents to paint on the screen. Otherwise, `LayoutHorizontalEven` and `LayoutVerticalEven` will
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// have it compute even distributions of space for all components either horizontally or vertically,
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// filling the container.
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type Container struct {
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x, y int
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h, w int
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layoutMethod int
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contents Contents
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visible bool
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}
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func NewContainer(contents Contents, layoutMethod int) *Container {
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return &Container{
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layoutMethod: layoutMethod,
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contents: contents,
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visible: true,
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}
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}
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func (c *Container) Draw(s tcell.Screen) {
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if !c.visible {
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return
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}
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for i := range c.contents {
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c.contents[i].Container.Draw(s)
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}
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}
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func (c *Container) SetSize(x, y, h, w int) {
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c.x, c.y, c.h, c.w = x, y, h, w
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carry := 0
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if c.layoutMethod == LayoutVerticalEven {
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num := len(c.contents)
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extra := c.h % num
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for r := range c.contents {
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w := c.w
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h := c.h / num
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x := c.x
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y := c.y + (h * r) + carry
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if extra > 0 { // distribute "extra" space to containers as we have some left
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h++
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extra--
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carry++
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}
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c.contents[r].Container.SetSize(x, y, h, w)
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}
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} else if c.layoutMethod == LayoutHorizontalEven {
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num := len(c.contents)
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extra := c.w % num
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for r := range c.contents {
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w := c.w / num
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h := c.h
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x := c.x + (w * r) + carry
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y := c.y
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if extra > 0 { // distribute "extra" space to containers as we have some left
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w++
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extra--
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carry++
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}
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c.contents[r].Container.SetSize(x, y, h, w)
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}
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} else if c.layoutMethod == LayoutHorizontalPercent {
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// first, work out overall distribution
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total := 0
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for r := range c.contents {
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// `0` or negatives are set as minimum
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if c.contents[r].Offsets.Percent < 1 {
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total += 1
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} else {
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total += c.contents[r].Offsets.Percent
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}
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}
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carry := 0
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// push around containers
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for r := range c.contents {
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ratio := (float64(c.contents[r].Offsets.Percent) / float64(total))
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w := int(float64(c.w) * ratio)
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h := c.h
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x := c.x + carry
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y := c.y
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carry += w
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// and add any remaining space to the last container
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if r == len(c.contents)-1 {
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w += (c.w - carry)
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}
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c.contents[r].Container.SetSize(x, y, h, w)
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}
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} else if c.layoutMethod == LayoutVerticalPercent {
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// first, work out overall distribution
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total := 0
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for r := range c.contents {
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// `0` or negatives are set as minimum
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if c.contents[r].Offsets.Percent < 1 {
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total += 1
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} else {
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total += c.contents[r].Offsets.Percent
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}
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}
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carry := 0
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// push around containers
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for r := range c.contents {
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ratio := (float64(c.contents[r].Offsets.Percent) / float64(total))
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w := c.w
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h := int(float64(c.h) * ratio)
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x := c.x
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y := c.y + carry
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carry += h
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// and add any remaining space to the last container
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if r == len(c.contents)-1 {
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h += (c.h - carry)
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}
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c.contents[r].Container.SetSize(x, y, h, w)
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}
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} else {
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for r := range c.contents {
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x := c.x + c.contents[r].Offsets.Left
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y := c.y + c.contents[r].Offsets.Top
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h := c.h - c.contents[r].Offsets.Bottom
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w := c.w - c.contents[r].Offsets.Right
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c.contents[r].Container.SetSize(x, y, h, w)
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}
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}
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}
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func (c *Container) SetStyle(s tcell.Style) {
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// containers have no visible elements to style
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}
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func (c *Container) SetVisible(b bool) {
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c.visible = b
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}
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func (c *Container) Contents() Contents {
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return c.contents
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}
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func (c *Container) SetContents(con Contents) {
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c.contents = con
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}
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// A Box draws a ASCII box around its contents, with an optional title and footer.
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type Box struct {
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x, y int
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h, w int
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title Drawable
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menuItems Drawable
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contents Contents
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style tcell.Style
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cascade bool
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visible bool
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transparent bool
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}
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func NewBox(title string, menuItems []string, contents Contents, initialStyle tcell.Style, cascade bool) *Box {
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return &Box{
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title: NewPaddedText(title),
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menuItems: NewPaddedText(strings.Join(menuItems, " ")),
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contents: contents,
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style: initialStyle,
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cascade: cascade,
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visible: true,
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transparent: false,
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}
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}
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func (b *Box) SetSize(x, y, h, w int) {
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b.x, b.y, b.h, b.w = x, y, h, w
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b.title.SetSize(b.x+2, b.y, 0, 0)
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b.menuItems.SetSize(b.x+2, b.y+b.h-1, 0, 0)
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for c := range b.contents {
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x := b.x + b.contents[c].Offsets.Left
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y := b.y + b.contents[c].Offsets.Top
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h := b.h - b.contents[c].Offsets.Bottom
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w := b.w - b.contents[c].Offsets.Right
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b.contents[c].Container.SetSize(x, y, h, w)
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}
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}
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func (b *Box) Draw(s tcell.Screen) {
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if !b.visible {
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return
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}
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// blank out inner area
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if !b.transparent {
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for m := b.x + 1; m < b.x+b.w-1; m++ {
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for n := b.y + 1; n < b.y+b.h-1; n++ {
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s.SetContent(m, n, ' ', nil, b.style)
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}
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}
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}
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// draw outside bars
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for m := b.x + 1; m < b.x+b.w-1; m++ {
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s.SetContent(m, b.y, tcell.RuneHLine, nil, b.style)
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s.SetContent(m, b.y+b.h-1, tcell.RuneHLine, nil, b.style)
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}
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for m := b.y + 1; m < b.y+b.h-1; m++ {
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s.SetContent(b.x, m, tcell.RuneVLine, nil, b.style)
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s.SetContent(b.x+b.w-1, m, tcell.RuneVLine, nil, b.style)
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}
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s.SetContent(b.x, b.y, tcell.RuneULCorner, nil, b.style)
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s.SetContent(b.x+b.w-1, b.y, tcell.RuneURCorner, nil, b.style)
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s.SetContent(b.x, b.y+b.h-1, tcell.RuneLLCorner, nil, b.style)
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s.SetContent(b.x+b.w-1, b.y+b.h-1, tcell.RuneLRCorner, nil, b.style)
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if b.title != nil {
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b.title.Draw(s)
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}
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if b.menuItems != nil {
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b.menuItems.Draw(s)
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}
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for c := range b.contents {
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b.contents[c].Container.Draw(s)
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}
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}
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func (b *Box) SetStyle(s tcell.Style) {
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b.style = s
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b.title.SetStyle(s)
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b.menuItems.SetStyle(s)
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if b.cascade {
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for c := range b.contents {
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b.contents[c].Container.SetStyle(s)
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}
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}
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}
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func (b *Box) SetVisible(v bool) {
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b.visible = v
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}
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func (b *Box) SetTransparent(v bool) {
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b.transparent = v
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}
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func (b *Box) Contents() Contents {
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return b.contents
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}
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func (b *Box) SetContents(c Contents) {
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b.contents = c
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}
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// A List is a scrollable, pageable list with a selector token.
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type List struct {
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x, y int
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h, w int
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selected int
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listItems []ListKeyValue
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style tcell.Style
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visible bool
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}
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type ListKeyValue struct {
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Key int
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Value string
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}
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func NewList(listItems []ListKeyValue, initialSelected int) *List {
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return &List{
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listItems: listItems,
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selected: initialSelected,
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visible: true,
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}
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}
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func (l *List) SetSize(x, y, h, w int) {
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l.x, l.y, l.h, l.w = x, y, h, w
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}
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func (l *List) Draw(s tcell.Screen) {
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if !l.visible {
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return
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}
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for i := range l.listItems {
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for j, r := range l.listItems[i].Value {
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s.SetContent(l.x+j, l.y+i, r, nil, l.style)
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}
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if i == l.selected {
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s.SetContent(l.x+len(l.listItems[i].Value)+1, l.y+i, '<', nil, l.style)
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}
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}
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}
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func (l *List) SetVisible(b bool) {
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l.visible = b
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}
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func (l *List) SetStyle(s tcell.Style) {
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l.style = s
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}
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func (l *List) Selected() int {
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return l.selected
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}
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func (l *List) SelectedID() int {
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if l.listItems == nil || len(l.listItems) == 0 {
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return 0
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}
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return l.listItems[l.selected].Key
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}
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func (l *List) SetSelected(i int) {
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l.selected = i
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}
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func (l *List) ListMembers() []ListKeyValue {
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return l.listItems
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}
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// BookDetails displays an editable list of book details
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type BookDetails struct {
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x, y int
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h, w int
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book *book.Book
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style tcell.Style
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visible bool
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}
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func NewBookDetails(b *book.Book) *BookDetails {
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return &BookDetails{
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book: b,
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visible: true,
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}
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}
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func (l *BookDetails) SetBook(b *book.Book) {
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l.book = b
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}
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func (l *BookDetails) SetSize(x, y, h, w int) {
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l.x, l.y, l.h, l.w = x, y, h, w
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}
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func (l *BookDetails) Draw(s tcell.Screen) {
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if l.book == nil {
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return
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}
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if !l.visible {
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return
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}
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items := []struct {
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label string
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value string
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}{
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{"Title", l.book.Title},
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{"Authors", strings.Join(l.book.Authors, ", ")},
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{"Sort Author", l.book.SortAuthor},
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{"ISBN-10", l.book.ISBN10},
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{"ISBN-13", l.book.ISBN13},
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{"Format", l.book.Format},
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{"Genre", l.book.Genre},
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{"Publisher", l.book.Publisher},
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{"Series", l.book.Series},
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{"Volume", l.book.Volume},
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{"Year", l.book.Year},
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{"Signed", strconv.FormatBool(l.book.Signed)},
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{"On Loan", l.book.OnLoan},
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{"Cover URL", l.book.CoverURL},
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{"Notes", l.book.Notes},
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{"Description", l.book.Description},
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}
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for i := range items {
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if i < l.h-2 {
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kv := NewKeyValue(items[i].label, ": ", items[i].value)
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kv.SetSize(l.x, l.y+i, 0, 0)
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kv.SetStyle(l.style)
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kv.Draw(s)
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}
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}
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}
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func (l *BookDetails) SetVisible(b bool) {
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l.visible = b
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}
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func (l *BookDetails) SetStyle(s tcell.Style) {
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l.style = s
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}
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// PaddedText outputs strings with a space on both sides.
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// Useful for generating headings, footers, etc. Used by Box.
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type PaddedText struct {
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x, y int
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h, w int
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text string
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style tcell.Style
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visible bool
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}
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func NewPaddedText(text string) *PaddedText {
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return &PaddedText{text: text, visible: true}
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}
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func (p *PaddedText) SetSize(x, y, _, _ int) {
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p.x, p.y, p.h, p.w = x, y, 1, len(p.text)+2
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}
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func (p *PaddedText) SetStyle(s tcell.Style) {
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p.style = s
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}
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func (p *PaddedText) Draw(s tcell.Screen) {
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if p.text == "" {
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return
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}
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if !p.visible {
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return
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}
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t := p.x
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s.SetContent(t, p.y, ' ', nil, p.style)
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t++
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for _, r := range p.text {
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s.SetContent(t, p.y, r, nil, p.style)
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t++
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}
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s.SetContent(t, p.y, ' ', nil, p.style)
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}
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func (p *PaddedText) SetVisible(b bool) {
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p.visible = b
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}
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type KeyValue struct {
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x, y int
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h, w int
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key string
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value string
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separator string
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style tcell.Style
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visible bool
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}
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func NewKeyValue(key, separator, value string) *KeyValue {
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return &KeyValue{
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key: key,
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separator: separator,
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value: value,
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visible: true,
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}
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}
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func (p *KeyValue) SetSize(x, y, _, _ int) {
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p.x, p.y, p.h, p.w = x, y, 1, len(p.key)+len(p.separator)+len(p.value)
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}
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func (p *KeyValue) SetStyle(s tcell.Style) {
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p.style = s
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}
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func (p *KeyValue) Draw(s tcell.Screen) {
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if !p.visible {
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return
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}
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for j, r := range p.key {
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s.SetContent(p.x+j, p.y, r, nil, p.style)
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}
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for j, r := range p.separator {
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s.SetContent(p.x+len(p.key)+j, p.y, r, nil, p.style)
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}
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for j, r := range p.value {
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s.SetContent(p.x+len(p.key)+len(p.separator)+j, p.y, r, nil, p.style)
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}
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}
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func (p *KeyValue) SetVisible(b bool) {
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p.visible = b
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}
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func (p *KeyValue) GetValue() string {
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return p.value
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}
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type EditableTextLine struct {
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x, y int
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h, w int
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text string
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style tcell.Style
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visible bool
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cursorPos int
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}
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func NewEditableTextLine(initialText string) *EditableTextLine {
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return &EditableTextLine{
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text: initialText,
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visible: true,
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}
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}
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func (p *EditableTextLine) SetSize(x, y, _, _ int) {
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p.x, p.y, p.h, p.w = x, y, 1, len(p.text)
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}
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func (p *EditableTextLine) SetStyle(s tcell.Style) {
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p.style = s
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}
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func (p *EditableTextLine) Draw(s tcell.Screen) {
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if !p.visible {
|
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return
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}
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for j, r := range p.text {
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s.SetContent(p.x+j, p.y, r, nil, p.style)
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}
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}
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func (p *EditableTextLine) SetText(t string) {
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p.text = t
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if len(p.text) == 0 {
|
|
p.ResetCursor(true)
|
|
return
|
|
}
|
|
p.ResetCursor(false)
|
|
}
|
|
|
|
func (p *EditableTextLine) ResetCursor(beginning bool) {
|
|
if beginning {
|
|
p.cursorPos = 0
|
|
} else {
|
|
p.cursorPos = len(p.text)
|
|
}
|
|
}
|
|
|
|
func (p *EditableTextLine) InsertAtCursor(r rune) {
|
|
if len(p.text) == 0 {
|
|
p.text = string(r)
|
|
p.cursorPos = 1
|
|
return
|
|
}
|
|
p.text = p.text[0:p.cursorPos] + string(r) + p.text[p.cursorPos:len(p.text)]
|
|
p.cursorPos = p.cursorPos + 1
|
|
}
|
|
|
|
func (p *EditableTextLine) MoveCursor(i int) {
|
|
if p.cursorPos+i < 0 {
|
|
p.cursorPos = 0
|
|
return
|
|
}
|
|
if p.cursorPos+i > len(p.text) {
|
|
p.cursorPos = len(p.text)
|
|
return
|
|
}
|
|
p.cursorPos = p.cursorPos + i
|
|
}
|
|
|
|
func (p *EditableTextLine) DeleteAtCursor() {
|
|
if len(p.text) == 0 {
|
|
p.cursorPos = 0
|
|
return
|
|
}
|
|
p.text = p.text[0:p.cursorPos-1] + p.text[p.cursorPos:len(p.text)]
|
|
p.cursorPos = p.cursorPos - 1
|
|
}
|