/
tab.go
275 lines (235 loc) · 6.23 KB
/
tab.go
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package widgets
import (
"image"
"image/color"
"unicode"
"gioui.org/op"
"gioui.org/op/clip"
"gioui.org/op/paint"
"github.com/mirzakhany/chapar/internal/safemap"
"github.com/mirzakhany/chapar/ui/chapartheme"
"gioui.org/layout"
"gioui.org/unit"
"gioui.org/widget"
"gioui.org/widget/material"
)
type Tabs struct {
list layout.List
tabs []*Tab
selected int
// number of characters to show in the tab title
maxTitleWidth int
onSelectedChange func(int)
}
type Tab struct {
btn widget.Clickable
Title string
Identifier string
Closable bool
CloseClickable *widget.Clickable
isDataChanged bool
onClose func(t *Tab)
isClosed bool
Meta *safemap.Map[string]
}
func NewTabs(items []*Tab, onSelectedChange func(int)) *Tabs {
t := &Tabs{
tabs: items,
selected: 0,
onSelectedChange: onSelectedChange,
}
return t
}
func (tabs *Tabs) SetMaxTitleWidth(maxWidth int) {
tabs.maxTitleWidth = maxWidth
}
func (tabs *Tabs) Selected() int {
return tabs.selected
}
func (tabs *Tabs) SelectedTab() *Tab {
if len(tabs.tabs) == 0 {
return nil
}
return tabs.tabs[tabs.selected]
}
func (tab *Tab) GetIdentifier() string {
if tab == nil {
return ""
}
return tab.Identifier
}
func (tab *Tab) SetOnClose(f func(t *Tab)) {
tab.onClose = f
}
func (tabs *Tabs) AddTab(tab *Tab) int {
tabs.tabs = append(tabs.tabs, tab)
return len(tabs.tabs) - 1
}
func (tabs *Tabs) RemoveTabByID(id string) {
tab := tabs.findTabByID(id)
if tab == nil {
return
}
tab.isClosed = true
}
func (tabs *Tabs) findTabByID(id string) *Tab {
for _, t := range tabs.tabs {
if t.Identifier == id {
return t
}
}
return nil
}
func (tabs *Tabs) SetSelected(index int) {
tabs.selected = index
}
func (tabs *Tabs) SetSelectedByID(id string) {
for i, t := range tabs.tabs {
if t.Identifier == id {
tabs.selected = i
return
}
}
}
func (tabs *Tabs) SetTabs(items []*Tab) {
tabs.tabs = items
}
func (tab *Tab) SetDataChanged(changed bool) {
tab.isDataChanged = changed
}
func (tab *Tab) SetIdentifier(id string) {
tab.Identifier = id
}
func (tab *Tab) IsDataChanged() bool {
return tab.isDataChanged
}
func (tabs *Tabs) Layout(gtx layout.Context, theme *chapartheme.Theme) layout.Dimensions {
// update tabs with new items
tabItems := make([]*Tab, 0)
for _, ot := range tabs.tabs {
if !ot.isClosed {
tabItems = append(tabItems, ot)
}
}
tabs.tabs = tabItems
if tabs.selected > len(tabs.tabs)-1 {
if len(tabs.tabs) > 0 {
tabs.selected = len(tabs.tabs) - 1
} else {
tabs.selected = 0
}
}
if len(tabs.tabs) == 1 {
tabs.selected = 0
}
return layout.Flex{Axis: layout.Vertical}.Layout(gtx,
layout.Rigid(func(gtx layout.Context) layout.Dimensions {
return tabs.list.Layout(gtx, len(tabs.tabs), func(gtx layout.Context, tabIdx int) layout.Dimensions {
if tabIdx > len(tabs.tabs)-1 {
tabIdx = len(tabs.tabs) - 1
}
t := tabs.tabs[tabIdx]
if t.Closable && t.onClose != nil && t.CloseClickable.Clicked(gtx) {
t.onClose(t)
gtx.Execute(op.InvalidateCmd{})
}
if t.btn.Clicked(gtx) {
tabs.selected = tabIdx
if tabs.onSelectedChange != nil {
go tabs.onSelectedChange(tabIdx)
gtx.Execute(op.InvalidateCmd{})
}
}
if t.btn.Hovered() {
paint.FillShape(gtx.Ops, theme.Palette.ContrastBg, clip.Rect{Max: gtx.Constraints.Min}.Op())
}
var tabWidth int
return layout.Stack{Alignment: layout.S}.Layout(gtx,
layout.Stacked(func(gtx layout.Context) layout.Dimensions {
var dims layout.Dimensions
if t.Closable {
dims = Clickable(gtx, &t.btn, func(gtx layout.Context) layout.Dimensions {
return layout.Flex{Axis: layout.Horizontal, Alignment: layout.Middle}.Layout(gtx,
layout.Rigid(func(gtx layout.Context) layout.Dimensions {
return layout.UniformInset(unit.Dp(12)).Layout(gtx,
material.Label(theme.Material(), unit.Sp(13), ellipticalTruncate(t.Title, tabs.maxTitleWidth)).Layout,
)
}),
layout.Rigid(layout.Spacer{Width: unit.Dp(2)}.Layout),
layout.Rigid(func(gtx layout.Context) layout.Dimensions {
bkColor := color.NRGBA{}
hoveredColor := Hovered(bkColor)
if t.btn.Hovered() {
bkColor = hoveredColor
}
iconColor := theme.ContrastFg
closeIcon := CloseIcon
iconSize := unit.Dp(16)
padding := unit.Dp(4)
if t.isDataChanged {
// yellow
iconColor = color.NRGBA{R: 0xff, G: 0xff, B: 0x00, A: 0xff}
closeIcon = CircleIcon
iconSize = unit.Dp(10)
padding = unit.Dp(8)
}
ib := &IconButton{
Icon: closeIcon,
Color: iconColor,
BackgroundColor: bkColor,
BackgroundColorHover: hoveredColor,
Size: iconSize,
Clickable: t.CloseClickable,
}
return layout.UniformInset(padding).Layout(gtx,
func(gtx layout.Context) layout.Dimensions {
return ib.Layout(gtx, theme)
},
)
}),
)
})
} else {
dims = Clickable(gtx, &t.btn, func(gtx layout.Context) layout.Dimensions {
return layout.UniformInset(unit.Dp(12)).Layout(gtx,
material.Label(theme.Material(), unit.Sp(13), t.Title).Layout,
)
})
}
tabWidth = dims.Size.X
return dims
}),
layout.Stacked(func(gtx layout.Context) layout.Dimensions {
if tabs.selected != tabIdx {
return layout.Dimensions{}
}
tabHeight := gtx.Dp(unit.Dp(2))
tabRect := image.Rect(0, 0, tabWidth, tabHeight)
paint.FillShape(gtx.Ops, theme.TabInactiveColor, clip.Rect(tabRect).Op())
return layout.Dimensions{
Size: image.Point{X: tabWidth, Y: tabHeight},
}
}),
)
})
}),
DrawLineFlex(theme.SeparatorColor, unit.Dp(1), unit.Dp(gtx.Constraints.Max.Y)),
)
}
func ellipticalTruncate(text string, maxLen int) string {
if maxLen == 0 {
return text
}
lastSpaceIx := maxLen
l := 0
for i, r := range text {
if unicode.IsSpace(r) {
lastSpaceIx = i
}
l++
if l > maxLen {
return text[:lastSpaceIx] + "..."
}
}
return text
}