plasma-framework/declarativeimports/plasmacomponents/qml/private/TabGroup.js

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var allContainers = []
var allContents = []

function hasContainer(content) {
    for (var i = 0; i < allContainers.length; ++i) {
        if (allContainers[i].children[0] == content)
            return true
    }
    return false
}

function addContent(content) {
    for (var i = 0; i < allContents.length; ++i) {
        if (allContents[i] == content)
            return false
    }
    allContents.push(content)
    return true
}

function ensureContainers() {
    var somethingChanged = false

    // check if we need to create a container
    for (var i = 0; i < root.privateContents.length; ++i) {
        var content = root.privateContents[i]
        addContent(content)
        if (!hasContainer(content)) {
            var newContainer = tabContainerComponent.createObject(containerHost)
            content.parent = newContainer
            allContainers.push(newContainer)
            somethingChanged = true
        }
    }
    return somethingChanged
}

function addTab(content) {
    if (addContent(content)) {
        var newContainer = tabContainerComponent.createObject(containerHost)
        content.parent = newContainer
        allContainers.push(newContainer)
    }
}

function removeTab(content) {
    var foundIndex = -1
    for (var i = 0; i < allContents.length && foundIndex == -1; ++i) {
        if (allContents[i] == content)
            foundIndex = i
    }

    if (foundIndex != -1)
        allContents.splice(foundIndex, 1)

    if (hasContainer(content))
        content.parent = null // this causes deletion of container
}

function removeContainer(container) {
    var foundIndex = -1
    for (var i = 0; i < allContainers.length && foundIndex == -1; ++i) {
        if (allContainers[i] == container)
            foundIndex = i
    }

    if (foundIndex != -1) {
        var deletedContainer = allContainers[foundIndex]
        if (deletedContainer.children.length > 0)
            removeTab(deletedContainer.children[0])
        allContainers.splice(foundIndex, 1)
        deletedContainer.destroy()
    }
}