rui/tabsLayout.go

package rui

import (
	"strconv"
	"strings"
)

const (
	// CurrentTabChangedEvent is the constant for "current-tab-changed" property tag.
	// The "current-tab-changed" event occurs when the new tab becomes active.
	// The main listener format: func(TabsLayout, int, int), where
	// the second argument is the index of the new active tab,
	// the third argument is the index of the old active tab.
	CurrentTabChangedEvent = "current-tab-changed"

	// Icon is the constant for "icon" property tag.
	// The string "icon" property defines the icon name that is displayed in the tab.
	Icon = "icon"

	// TabCloseButton is the constant for "tab-close-button" property tag.
	// The "tab-close-button" is the bool property. If it is "true" then a close button is displayed within the tab.
	TabCloseButton = "tab-close-button"

	// TabCloseEvent is the constant for "tab-close-event" property tag.
	// The "tab-close-event" occurs when when the user clicks on the tab close button.
	// The main listener format: func(TabsLayout, int), where the second argument is the index of the tab.
	TabCloseEvent = "tab-close-event"

	// Tabs is the constant for the "tabs" property tag.
	// The "tabs" is the int property that sets where the tabs are located.
	// Valid values: TopTabs (0), BottomTabs (1), LeftTabs (2), RightTabs (3), LeftListTabs (4), RightListTabs (5), and HiddenTabs (6).
	Tabs = "tabs"

	// TabBarStyle is the constant for the "tab-bar-style" property tag.
	// The "tab-bar-style" is the string property that sets the style for the display of the tab bar.
	// The default value is "ruiTabBar".
	TabBarStyle = "tab-bar-style"

	// TabStyle is the constant for the "tab-style" property tag.
	// The "tab-style" is the string property that sets the style for the display of the tab.
	// The default value is "ruiTab" or "ruiVerticalTab".
	TabStyle = "tab-style"

	// CurrentTabStyle is the constant for the "current-tab-style" property tag.
	// The "current-tab-style" is the string property that sets the style for the display of the current (selected) tab.
	// The default value is "ruiCurrentTab" or "ruiCurrentVerticalTab".
	CurrentTabStyle = "current-tab-style"

	// TopTabs - tabs of TabsLayout are on the top
	TopTabs = 0
	// BottomTabs - tabs of TabsLayout are on the bottom
	BottomTabs = 1
	// LeftTabs - tabs of TabsLayout are on the left. Bookmarks are rotated counterclockwise 90 degrees.
	LeftTabs = 2
	// RightTabs - tabs of TabsLayout are on the right. Bookmarks are rotated clockwise 90 degrees.
	RightTabs = 3
	// LeftListTabs - tabs of TabsLayout are on the left
	LeftListTabs = 4
	// RightListTabs - tabs of TabsLayout are on the right
	RightListTabs = 5
	// HiddenTabs - tabs of TabsLayout are hidden
	HiddenTabs = 6

	inactiveTabStyle = "data-inactiveTabStyle"
	activeTabStyle   = "data-activeTabStyle"
)

// TabsLayout - multi-tab container of View
type TabsLayout interface {
	ViewsContainer
	ListAdapter
}

type tabsLayoutData struct {
	viewsContainerData
	tabListener      []func(TabsLayout, int, int)
	tabCloseListener []func(TabsLayout, int)
}

// NewTabsLayout create new TabsLayout object and return it
func NewTabsLayout(session Session, params Params) TabsLayout {
	view := new(tabsLayoutData)
	view.init(session)
	setInitParams(view, params)
	return view
}

func newTabsLayout(session Session) View {
	return NewTabsLayout(session, nil)
}

// Init initialize fields of ViewsContainer by default values
func (tabsLayout *tabsLayoutData) init(session Session) {
	tabsLayout.viewsContainerData.init(session)
	tabsLayout.tag = "TabsLayout"
	tabsLayout.systemClass = "ruiTabsLayout"
	tabsLayout.tabListener = []func(TabsLayout, int, int){}
	tabsLayout.tabCloseListener = []func(TabsLayout, int){}
}

func (tabsLayout *tabsLayoutData) String() string {
	return getViewString(tabsLayout)
}

func (tabsLayout *tabsLayoutData) currentItem(defaultValue int) int {
	result, _ := intProperty(tabsLayout, Current, tabsLayout.session, defaultValue)
	return result
}

func (tabsLayout *tabsLayoutData) Get(tag string) any {
	return tabsLayout.get(strings.ToLower(tag))
}

func (tabsLayout *tabsLayoutData) get(tag string) any {
	switch tag {
	case CurrentTabChangedEvent:
		return tabsLayout.tabListener

	case TabCloseEvent:
		return tabsLayout.tabCloseListener
	}

	return tabsLayout.viewsContainerData.get(tag)
}

func (tabsLayout *tabsLayoutData) Remove(tag string) {
	tabsLayout.remove(strings.ToLower(tag))
}

func (tabsLayout *tabsLayoutData) remove(tag string) {
	switch tag {
	case CurrentTabChangedEvent:
		if len(tabsLayout.tabListener) > 0 {
			tabsLayout.tabListener = []func(TabsLayout, int, int){}
			tabsLayout.propertyChangedEvent(tag)
		}
		return

	case TabCloseEvent:
		if len(tabsLayout.tabCloseListener) > 0 {
			tabsLayout.tabCloseListener = []func(TabsLayout, int){}
			tabsLayout.propertyChangedEvent(tag)
		}
		return

	case Current:
		oldCurrent := tabsLayout.currentItem(0)
		delete(tabsLayout.properties, Current)
		if oldCurrent == 0 {
			return
		}
		if tabsLayout.created {
			tabsLayout.session.callFunc("activateTab", tabsLayout.htmlID(), 0)
			for _, listener := range tabsLayout.tabListener {
				listener(tabsLayout, 0, oldCurrent)
			}
		}

	case Tabs:
		delete(tabsLayout.properties, Tabs)
		if tabsLayout.created {
			htmlID := tabsLayout.htmlID()
			tabsLayout.session.updateProperty(htmlID, inactiveTabStyle, tabsLayout.inactiveTabStyle())
			tabsLayout.session.updateProperty(htmlID, activeTabStyle, tabsLayout.activeTabStyle())
			updateCSSStyle(htmlID, tabsLayout.session)
			updateInnerHTML(htmlID, tabsLayout.session)
		}

	case TabStyle, CurrentTabStyle:
		delete(tabsLayout.properties, tag)
		if tabsLayout.created {
			htmlID := tabsLayout.htmlID()
			tabsLayout.session.updateProperty(htmlID, inactiveTabStyle, tabsLayout.inactiveTabStyle())
			tabsLayout.session.updateProperty(htmlID, activeTabStyle, tabsLayout.activeTabStyle())
			updateInnerHTML(htmlID, tabsLayout.session)
		}

	case TabCloseButton:
		delete(tabsLayout.properties, tag)
		if tabsLayout.created {
			updateInnerHTML(tabsLayout.htmlID(), tabsLayout.session)
		}

	default:
		tabsLayout.viewsContainerData.remove(tag)
		return
	}

	tabsLayout.propertyChangedEvent(tag)
}

func (tabsLayout *tabsLayoutData) Set(tag string, value any) bool {
	return tabsLayout.set(strings.ToLower(tag), value)
}

func (tabsLayout *tabsLayoutData) set(tag string, value any) bool {
	if value == nil {
		tabsLayout.remove(tag)
		return true
	}

	switch tag {
	case CurrentTabChangedEvent:
		listeners := tabsLayout.valueToTabListeners(value)
		if listeners == nil {
			notCompatibleType(tag, value)
			return false
		}
		tabsLayout.tabListener = listeners

	case TabCloseEvent:
		listeners, ok := valueToEventListeners[TabsLayout, int](value)
		if !ok {
			notCompatibleType(tag, value)
			return false
		} else if listeners == nil {
			listeners = []func(TabsLayout, int){}
		}
		tabsLayout.tabCloseListener = listeners

	case Current:
		if current, ok := value.(int); ok && current < 0 {
			tabsLayout.remove(Current)
			return true
		}

		oldCurrent := tabsLayout.currentItem(-1)
		if !tabsLayout.setIntProperty(Current, value) {
			return false
		}

		current := tabsLayout.currentItem(0)
		if oldCurrent == current {
			return true
		}
		if tabsLayout.created {
			tabsLayout.session.callFunc("activateTab", tabsLayout.htmlID(), current)
			for _, listener := range tabsLayout.tabListener {
				listener(tabsLayout, current, oldCurrent)
			}
		}

	case Tabs:
		if !tabsLayout.setEnumProperty(Tabs, value, enumProperties[Tabs].values) {
			return false
		}
		if tabsLayout.created {
			htmlID := tabsLayout.htmlID()
			tabsLayout.session.updateProperty(htmlID, inactiveTabStyle, tabsLayout.inactiveTabStyle())
			tabsLayout.session.updateProperty(htmlID, activeTabStyle, tabsLayout.activeTabStyle())
			updateCSSStyle(htmlID, tabsLayout.session)
			updateInnerHTML(htmlID, tabsLayout.session)
		}

	case TabStyle, CurrentTabStyle, TabBarStyle:
		if text, ok := value.(string); ok {
			if text == "" {
				delete(tabsLayout.properties, tag)
			} else {
				tabsLayout.properties[tag] = text
			}
		} else {
			notCompatibleType(tag, value)
			return false
		}

		if tabsLayout.created {
			htmlID := tabsLayout.htmlID()
			tabsLayout.session.updateProperty(htmlID, inactiveTabStyle, tabsLayout.inactiveTabStyle())
			tabsLayout.session.updateProperty(htmlID, activeTabStyle, tabsLayout.activeTabStyle())
			updateInnerHTML(htmlID, tabsLayout.session)
		}

	case TabCloseButton:
		if !tabsLayout.setBoolProperty(tag, value) {
			return false
		}
		if tabsLayout.created {
			updateInnerHTML(tabsLayout.htmlID(), tabsLayout.session)
		}

	default:
		return tabsLayout.viewsContainerData.set(tag, value)
	}

	tabsLayout.propertyChangedEvent(tag)
	return true
}

func (tabsLayout *tabsLayoutData) valueToTabListeners(value any) []func(TabsLayout, int, int) {
	if value == nil {
		return []func(TabsLayout, int, int){}
	}

	switch value := value.(type) {
	case func(TabsLayout, int, int):
		return []func(TabsLayout, int, int){value}

	case func(TabsLayout, int):
		fn := func(view TabsLayout, current, _ int) {
			value(view, current)
		}
		return []func(TabsLayout, int, int){fn}

	case func(TabsLayout):
		fn := func(view TabsLayout, _, _ int) {
			value(view)
		}
		return []func(TabsLayout, int, int){fn}

	case func(int, int):
		fn := func(_ TabsLayout, current, old int) {
			value(current, old)
		}
		return []func(TabsLayout, int, int){fn}

	case func(int):
		fn := func(_ TabsLayout, current, _ int) {
			value(current)
		}
		return []func(TabsLayout, int, int){fn}

	case func():
		fn := func(TabsLayout, int, int) {
			value()
		}
		return []func(TabsLayout, int, int){fn}

	case []func(TabsLayout, int, int):
		return value

	case []func(TabsLayout, int):
		listeners := make([]func(TabsLayout, int, int), len(value))
		for i, val := range value {
			if val == nil {
				return nil
			}
			listeners[i] = func(view TabsLayout, current, _ int) {
				val(view, current)
			}
		}
		return listeners

	case []func(TabsLayout):
		listeners := make([]func(TabsLayout, int, int), len(value))
		for i, val := range value {
			if val == nil {
				return nil
			}
			listeners[i] = func(view TabsLayout, _, _ int) {
				val(view)
			}
		}
		return listeners

	case []func(int, int):
		listeners := make([]func(TabsLayout, int, int), len(value))
		for i, val := range value {
			if val == nil {
				return nil
			}
			listeners[i] = func(_ TabsLayout, current, old int) {
				val(current, old)
			}
		}
		return listeners

	case []func(int):
		listeners := make([]func(TabsLayout, int, int), len(value))
		for i, val := range value {
			if val == nil {
				return nil
			}
			listeners[i] = func(_ TabsLayout, current, _ int) {
				val(current)
			}
		}
		return listeners

	case []func():
		listeners := make([]func(TabsLayout, int, int), len(value))
		for i, val := range value {
			if val == nil {
				return nil
			}
			listeners[i] = func(TabsLayout, int, int) {
				val()
			}
		}
		return listeners

	case []any:
		listeners := make([]func(TabsLayout, int, int), len(value))
		for i, val := range value {
			if val == nil {
				return nil
			}
			switch val := val.(type) {
			case func(TabsLayout, int, int):
				listeners[i] = val

			case func(TabsLayout, int):
				listeners[i] = func(view TabsLayout, current, _ int) {
					val(view, current)
				}

			case func(TabsLayout):
				listeners[i] = func(view TabsLayout, _, _ int) {
					val(view)
				}

			case func(int, int):
				listeners[i] = func(_ TabsLayout, current, old int) {
					val(current, old)
				}

			case func(int):
				listeners[i] = func(_ TabsLayout, current, _ int) {
					val(current)
				}

			case func():
				listeners[i] = func(TabsLayout, int, int) {
					val()
				}

			default:
				return nil
			}
		}
		return listeners
	}

	return nil
}

func (tabsLayout *tabsLayoutData) tabsLocation() int {
	tabs, _ := enumProperty(tabsLayout, Tabs, tabsLayout.session, 0)
	return tabs
}

func (tabsLayout *tabsLayoutData) tabBarStyle() string {
	if style, ok := stringProperty(tabsLayout, TabBarStyle, tabsLayout.session); ok {
		return style
	}
	if value := valueFromStyle(tabsLayout, TabBarStyle); value != nil {
		if style, ok := value.(string); ok {
			if style, ok = tabsLayout.session.resolveConstants(style); ok {
				return style
			}
		}
	}
	return "ruiTabBar"
}

func (tabsLayout *tabsLayoutData) inactiveTabStyle() string {
	if style, ok := stringProperty(tabsLayout, TabStyle, tabsLayout.session); ok {
		return style
	}
	if value := valueFromStyle(tabsLayout, TabStyle); value != nil {
		if style, ok := value.(string); ok {
			if style, ok = tabsLayout.session.resolveConstants(style); ok {
				return style
			}
		}
	}
	switch tabsLayout.tabsLocation() {
	case LeftTabs, RightTabs:
		return "ruiVerticalTab"
	}
	return "ruiTab"
}

func (tabsLayout *tabsLayoutData) activeTabStyle() string {
	if style, ok := stringProperty(tabsLayout, CurrentTabStyle, tabsLayout.session); ok {
		return style
	}
	if value := valueFromStyle(tabsLayout, CurrentTabStyle); value != nil {
		if style, ok := value.(string); ok {
			if style, ok = tabsLayout.session.resolveConstants(style); ok {
				return style
			}
		}
	}
	switch tabsLayout.tabsLocation() {
	case LeftTabs, RightTabs:
		return "ruiCurrentVerticalTab"
	}
	return "ruiCurrentTab"
}

func (tabsLayout *tabsLayoutData) ListSize() int {
	if tabsLayout.views == nil {
		tabsLayout.views = []View{}
	}
	return len(tabsLayout.views)
}

func (tabsLayout *tabsLayoutData) ListItem(index int, session Session) View {
	if tabsLayout.views == nil {
		tabsLayout.views = []View{}
	}

	if index < 0 || index >= len(tabsLayout.views) {
		return NewTextView(session, Params{
			Text: "Invalid index",
		})
	}

	views := []View{}
	page := tabsLayout.views[index]

	if icon, ok := imageProperty(page, Icon, session); ok && icon != "" {
		views = append(views, NewImageView(session, Params{
			Source: icon,
			Row:    0,
			Column: 0,
		}))
	}

	title, ok := stringProperty(page, Title, session)
	if !ok || title == "" {
		title = "No title"
	}
	if !GetNotTranslate(tabsLayout) {
		title, _ = tabsLayout.Session().GetString(title)
	}

	views = append(views, NewTextView(session, Params{
		Text:   title,
		Row:    0,
		Column: 1,
	}))

	closeButton, _ := boolProperty(tabsLayout, TabCloseButton, tabsLayout.session)
	if close, ok := boolProperty(page, TabCloseButton, tabsLayout.session); ok {
		closeButton = close
	}

	if closeButton {
		views = append(views, NewGridLayout(session, Params{
			Style:   "ruiTabCloseButton",
			Row:     0,
			Column:  2,
			Content: "✕",
			ClickEvent: func() {
				for _, listener := range tabsLayout.tabCloseListener {
					listener(tabsLayout, index)
				}
			},
		}))
	}

	tabsHeight, _ := sizeConstant(session, "ruiTabHeight")

	return NewGridLayout(session, Params{
		Height:            tabsHeight,
		CellWidth:         []SizeUnit{AutoSize(), Fr(1), AutoSize()},
		CellVerticalAlign: CenterAlign,
		GridRowGap:        Px(8),
		Content:           views,
	})
}

func (tabsLayout *tabsLayoutData) IsListItemEnabled(index int) bool {
	return true
}

func (tabsLayout *tabsLayoutData) updateTitle(view View, tag string) {
	session := tabsLayout.session
	title, _ := stringProperty(view, Title, session)
	if !GetNotTranslate(tabsLayout) {
		title, _ = session.GetString(title)
	}
	session.updateInnerHTML(view.htmlID()+"-title", title)
}

func (tabsLayout *tabsLayoutData) updateIcon(view View, tag string) {
	session := tabsLayout.session
	icon, _ := stringProperty(view, Icon, session)
	session.updateProperty(view.htmlID()+"-icon", "src", icon)
}

func (tabsLayout *tabsLayoutData) updateTabCloseButton(view View, tag string) {
	updateInnerHTML(tabsLayout.htmlID(), tabsLayout.session)
}

// Append appends view to the end of view list
func (tabsLayout *tabsLayoutData) Append(view View) {
	if tabsLayout.views == nil {
		tabsLayout.views = []View{}
	}
	if view != nil {
		tabsLayout.viewsContainerData.Append(view)
		view.SetChangeListener(Title, tabsLayout.updateTitle)
		view.SetChangeListener(Icon, tabsLayout.updateIcon)
		view.SetChangeListener(TabCloseButton, tabsLayout.updateTabCloseButton)
		if len(tabsLayout.views) == 1 {
			tabsLayout.properties[Current] = 0
			for _, listener := range tabsLayout.tabListener {
				listener(tabsLayout, 0, -1)
			}
			defer tabsLayout.propertyChangedEvent(Current)
		}
	}
}

// Insert inserts view to the "index" position in view list
func (tabsLayout *tabsLayoutData) Insert(view View, index int) {
	if tabsLayout.views == nil {
		tabsLayout.views = []View{}
	}
	if view != nil {
		if current := tabsLayout.currentItem(0); current >= index {
			tabsLayout.properties[Current] = current + 1
			defer tabsLayout.propertyChangedEvent(Current)
		}
		tabsLayout.viewsContainerData.Insert(view, index)
		view.SetChangeListener(Title, tabsLayout.updateTitle)
		view.SetChangeListener(Icon, tabsLayout.updateIcon)
		view.SetChangeListener(TabCloseButton, tabsLayout.updateTabCloseButton)
	}
}

// Remove removes view from list and return it
func (tabsLayout *tabsLayoutData) RemoveView(index int) View {
	if tabsLayout.views == nil {
		tabsLayout.views = []View{}
		return nil
	}

	count := len(tabsLayout.views)
	if index < 0 || index >= count {
		return nil
	}

	view := tabsLayout.views[index]
	view.setParentID("")
	view.SetChangeListener(Title, nil)
	view.SetChangeListener(Icon, nil)
	view.SetChangeListener(TabCloseButton, nil)

	current := tabsLayout.currentItem(0)
	if index < current || (index == current && current > 0) {
		current--
	}

	if len(tabsLayout.views) == 1 {
		tabsLayout.views = []View{}
		current = -1
	} else if index == 0 {
		tabsLayout.views = tabsLayout.views[1:]
	} else if index == count-1 {
		tabsLayout.views = tabsLayout.views[:index]
	} else {
		tabsLayout.views = append(tabsLayout.views[:index], tabsLayout.views[index+1:]...)
	}

	updateInnerHTML(tabsLayout.parentHTMLID(), tabsLayout.session)
	tabsLayout.propertyChangedEvent(Content)

	delete(tabsLayout.properties, Current)
	tabsLayout.set(Current, current)
	return view
}

func (tabsLayout *tabsLayoutData) htmlProperties(self View, buffer *strings.Builder) {
	tabsLayout.viewsContainerData.htmlProperties(self, buffer)
	buffer.WriteString(` data-inactiveTabStyle="`)
	buffer.WriteString(tabsLayout.inactiveTabStyle())
	buffer.WriteString(`" data-activeTabStyle="`)
	buffer.WriteString(tabsLayout.activeTabStyle())
	buffer.WriteString(`" data-current="`)
	buffer.WriteString(strconv.Itoa(tabsLayout.currentItem(0)))
	buffer.WriteRune('"')
}

func (tabsLayout *tabsLayoutData) cssStyle(self View, builder cssBuilder) {
	tabsLayout.viewsContainerData.cssStyle(self, builder)
	switch tabsLayout.tabsLocation() {
	case TopTabs:
		builder.add(`grid-template-rows`, `auto 1fr`)

	case BottomTabs:
		builder.add(`grid-template-rows`, `1fr auto`)

	case LeftTabs, LeftListTabs:
		builder.add(`grid-template-columns`, `auto 1fr`)

	case RightTabs, RightListTabs:
		builder.add(`grid-template-columns`, `1fr auto`)
	}
}

func (tabsLayout *tabsLayoutData) htmlSubviews(self View, buffer *strings.Builder) {
	if tabsLayout.views == nil {
		return
	}

	//viewCount := len(tabsLayout.views)
	current := tabsLayout.currentItem(0)
	location := tabsLayout.tabsLocation()
	tabsLayoutID := tabsLayout.htmlID()

	if location != HiddenTabs {

		buffer.WriteString(`<div class="`)
		buffer.WriteString(tabsLayout.tabBarStyle())
		buffer.WriteString(`" style="display: flex;`)

		switch location {
		case LeftTabs, LeftListTabs, TopTabs:
			buffer.WriteString(` grid-row-start: 1; grid-row-end: 2; grid-column-start: 1; grid-column-end: 2;`)

		case RightTabs, RightListTabs:
			buffer.WriteString(` grid-row-start: 1; grid-row-end: 2; grid-column-start: 2; grid-column-end: 3;`)

		case BottomTabs:
			buffer.WriteString(` grid-row-start: 2; grid-row-end: 3; grid-column-start: 1; grid-column-end: 2;`)
		}

		buffer.WriteString(` flex-flow: `)
		switch location {
		case LeftTabs, LeftListTabs, RightTabs, RightListTabs:
			buffer.WriteString(`column nowrap; justify-content: flex-start; align-items: stretch;`)

		default:
			buffer.WriteString(`row nowrap; justify-content: flex-start; align-items: stretch;`)
		}

		buffer.WriteString(`">`)

		inactiveStyle := tabsLayout.inactiveTabStyle()
		activeStyle := tabsLayout.activeTabStyle()

		notTranslate := GetNotTranslate(tabsLayout)
		closeButton, _ := boolProperty(tabsLayout, TabCloseButton, tabsLayout.session)

		var tabStyle, titleStyle string
		switch location {
		case LeftTabs, RightTabs:
			tabStyle = `display: grid; grid-template-rows: auto 1fr auto; align-items: center; justify-items: center; grid-row-gap: 8px;`

		case LeftListTabs, RightListTabs:
			tabStyle = `display: grid; grid-template-columns: auto 1fr auto; align-items: center; justify-items: start; grid-column-gap: 8px;`

		default:
			tabStyle = `display: grid; grid-template-columns: auto 1fr auto; align-items: center; justify-items: center; grid-column-gap: 8px;`
		}

		switch location {
		case LeftTabs:
			titleStyle = ` style="writing-mode: vertical-lr; transform: rotate(180deg); grid-row-start: 2; grid-row-end: 3; grid-column-start: 1; grid-column-end: 2;">`

		case RightTabs:
			titleStyle = ` style="writing-mode: vertical-lr; grid-row-start: 2; grid-row-end: 3; grid-column-start: 1; grid-column-end: 2;">`

		default:
			titleStyle = ` style="grid-row-start: 1; grid-row-end: 2; grid-column-start: 2; grid-column-end: 3;">`
		}

		for n, view := range tabsLayout.views {
			icon, _ := imageProperty(view, Icon, tabsLayout.session)
			title, _ := stringProperty(view, Title, tabsLayout.session)
			if !notTranslate {
				title, _ = tabsLayout.Session().GetString(title)
			}

			buffer.WriteString(`<div id="`)
			buffer.WriteString(tabsLayoutID)
			buffer.WriteByte('-')
			buffer.WriteString(strconv.Itoa(n))
			buffer.WriteString(`" class="`)
			if n == current {
				buffer.WriteString(activeStyle)
			} else {
				buffer.WriteString(inactiveStyle)
			}
			buffer.WriteString(`" tabindex="0" onclick="tabClickEvent(this, '`)
			buffer.WriteString(tabsLayoutID)
			buffer.WriteString(`', `)
			buffer.WriteString(strconv.Itoa(n))
			buffer.WriteString(`, event)" onkeydown="tabKeyClickEvent('`)
			buffer.WriteString(tabsLayoutID)
			buffer.WriteString(`', `)
			buffer.WriteString(strconv.Itoa(n))
			buffer.WriteString(`, event)" style="`)
			buffer.WriteString(tabStyle)
			buffer.WriteString(`" data-container="`)
			buffer.WriteString(tabsLayoutID)
			buffer.WriteString(`" data-view="`)
			buffer.WriteString(tabsLayoutID)
			buffer.WriteString(`-page`)
			buffer.WriteString(strconv.Itoa(n))
			buffer.WriteString(`">`)

			if icon != "" {
				buffer.WriteString(`<img id="`)
				buffer.WriteString(view.htmlID())
				switch location {
				case LeftTabs:
					buffer.WriteString(`-icon" style="grid-row-start: 3; grid-row-end: 4; grid-column-start: 1; grid-column-end: 2;" src="`)

				case RightTabs:
					buffer.WriteString(`-icon" style="grid-row-start: 1; grid-row-end: 2; grid-column-start: 1; grid-column-end: 2;" src="`)

				default:
					buffer.WriteString(`-icon" style="grid-row-start: 1; grid-row-end: 2; grid-column-start: 1; grid-column-end: 2;" src="`)
				}
				buffer.WriteString(icon)
				buffer.WriteString(`">`)
			}

			buffer.WriteString(`<div id="`)
			buffer.WriteString(view.htmlID())
			buffer.WriteString(`-title"`)
			buffer.WriteString(titleStyle)
			buffer.WriteString(title)
			buffer.WriteString(`</div>`)

			close, ok := boolProperty(view, TabCloseButton, tabsLayout.session)
			if !ok {
				close = closeButton
			}
			if close {
				buffer.WriteString(`<div class="ruiTabCloseButton" tabindex="0" onclick="tabCloseClickEvent(this, '`)
				buffer.WriteString(tabsLayoutID)
				buffer.WriteString(`', `)
				buffer.WriteString(strconv.Itoa(n))
				buffer.WriteString(`, event)" onkeydown="tabCloseKeyClickEvent('`)
				buffer.WriteString(tabsLayoutID)
				buffer.WriteString(`', `)
				buffer.WriteString(strconv.Itoa(n))
				buffer.WriteString(`, event)" style="display: grid; `)

				switch location {
				case LeftTabs:
					buffer.WriteString(`grid-row-start: 1; grid-row-end: 2; grid-column-start: 1; grid-column-end: 2;">`)

				case RightTabs:
					buffer.WriteString(`grid-row-start: 3; grid-row-end: 4; grid-column-start: 1; grid-column-end: 2;">`)

				default:
					buffer.WriteString(`grid-row-start: 1; grid-row-end: 2; grid-column-start: 3; grid-column-end: 4;">`)
				}

				buffer.WriteString(`✕</div>`)
			}

			buffer.WriteString(`</div>`)
		}

		buffer.WriteString(`</div>`)
	}

	for n, view := range tabsLayout.views {
		buffer.WriteString(`<div id="`)
		buffer.WriteString(tabsLayoutID)
		buffer.WriteString(`-page`)
		buffer.WriteString(strconv.Itoa(n))

		switch location {
		case LeftTabs, LeftListTabs:
			buffer.WriteString(`" style="position: relative; grid-row-start: 1; grid-row-end: 2; grid-column-start: 2; grid-column-end: 3;`)

		case TopTabs:
			buffer.WriteString(`" style="position: relative; grid-row-start: 2; grid-row-end: 3; grid-column-start: 1; grid-column-end: 2;`)

		default:
			buffer.WriteString(`" style="position: relative; grid-row-start: 1; grid-row-end: 2; grid-column-start: 1; grid-column-end: 2;`)
		}

		if current != n {
			buffer.WriteString(` display: none;`)
		}
		buffer.WriteString(`">`)

		view.addToCSSStyle(map[string]string{`position`: `absolute`, `left`: `0`, `right`: `0`, `top`: `0`, `bottom`: `0`})
		viewHTML(tabsLayout.views[n], buffer)
		buffer.WriteString(`</div>`)
	}
}

func (tabsLayout *tabsLayoutData) handleCommand(self View, command string, data DataObject) bool {
	switch command {
	case "tabClick":
		if numberText, ok := data.PropertyValue("number"); ok {
			if number, err := strconv.Atoi(numberText); err == nil {
				current := tabsLayout.currentItem(0)
				if current != number {
					tabsLayout.properties[Current] = number
					for _, listener := range tabsLayout.tabListener {
						listener(tabsLayout, number, current)
					}
					tabsLayout.propertyChangedEvent(Current)
				}
			}
		}
		return true

	case "tabCloseClick":
		if numberText, ok := data.PropertyValue("number"); ok {
			if number, err := strconv.Atoi(numberText); err == nil {
				for _, listener := range tabsLayout.tabCloseListener {
					listener(tabsLayout, number)
				}
			}
		}
		return true
	}
	return tabsLayout.viewsContainerData.handleCommand(self, command, data)
}