-- NotificationLayer.lua

local P = createMenuSheet("NotificationLayer", true, TriBool.True, TriBool.True)

P.queueList = {}
P.editMode = false

P.sampleWindow = nil

-- Loads the queues from the NotificationManager and creates the sample window, that is used to measure the width various strings need.
function P.onLoad()
    orxonox.NotificationManager:getInstance():loadQueues()
    P.sampleWindow = winMgr:createWindow("MenuWidgets/StaticText", "orxonox/NotificationLayer/Root/SampleWindow")
end

-- Creates a queue in the GUI.
function P.createQueue(name, size)
    local root = winMgr:getWindow("orxonox/NotificationLayer/Root")
    --local queue = winMgr:createWindow("MenuWidgets/Listbox", "orxonox/NotificationLayer/Root/Queue/" .. name)
    --queue:setProperty("BackgroundColor", "00FFFFFF") -- Set background to be fully transparent.
    local queue = winMgr:createWindow("MenuWidgets/ScrollablePane", "orxonox/NotificationLayer/Root/Queue/" .. name)
    queue:setProperty("Alpha", 0.0)
    --queue:setProperty("FrameEnabled", "false")
    root:addChildWindow(queue)

    local queueTuple =
    {
        ["window"]    = queue,
        ["name"]      = name,
        ["edit"]      = nil,
        ["visible"]   = false,
        ["fontSize"]  = 12,
        ["fontColor"] = "FFFFFFFF",
        ["items"]     = {},
        ["first"]     = 1,
        ["last"]      = 1
    }
    
    queue:setPosition(CEGUI.UVector2(CEGUI.UDim(0, 0), CEGUI.UDim(0, 0)))
    queue:setSize(CEGUI.UVector2(CEGUI.UDim(1.0, 0), CEGUI.UDim(0, P.queueHeightHelper(queueTuple, size))))

    P.queueList[name] = queueTuple -- name access
    P.setVisible(queueTuple, false) -- Set the queue to invisible as long as there are no notifications in it.
end

-- Removes a queue from the GUI.
function P.removeQueue(queueName)
    local queue = P.queueList[queueName]

    if queue ~= nil then
        winMgr:destroyWindow(queue.window)
    end
    P.queueList[queueName] = nil
end

-- Pushes an input notification to the input queue.
function P.pushNotification(queueName, notification)
    local queue = P.queueList[queueName]
    if queue == nil then
        return
    end

    local item = winMgr:createWindow("MenuWidgets/StaticText", "orxonox/NotificationLayer/Root/Queue/" .. queueName .. "/" .. queue.last)
    item:setText(notification)
    P.setItemFontHelper(item, queue, true)
    -- Add the item to the top of the queue.
    local itemHeight = P.itemHeightHelper(queue)
    if queue.last-queue.first > 0 then -- If the queue is not empty move all items down
        for i=queue.first,queue.last-1 do
            local item = queue.items[i]
            item:setYPosition(CEGUI.UDim(0, itemHeight*(queue.last-i)))
        end
    end
    queue.window:addChildWindow(item)
    item:setSize(CEGUI.UVector2(CEGUI.UDim(1, 0), CEGUI.UDim(0, itemHeight)))
    item:setPosition(CEGUI.UVector2(CEGUI.UDim(0, 0), CEGUI.UDim(0, 0)))
    item:setProperty("Alpha", 1.0)
    item:setProperty("InheritsAlpha", "false")
    item:setProperty("BackgroundEnabled", "false")
    item:setProperty("FrameEnabled", "false")
    queue.items[queue.last] = item
    queue.last = queue.last+1

    -- If the queue has been invisible, set it to visible.
    if queue.visible == false then
        P.setVisible(queue, true)
    end
end

-- Pops the least recently added notification from the queue.
function P.popNotification(queueName)
    local queue = P.queueList[queueName]
    if queue == nil then
        return
    end
    local item = queue.items[queue.first]
    -- Removes the item from the bottom of the queue.
    queue.window:removeChildWindow(item)
    winMgr:destroyWindow(item)
    queue.first = queue.first+1

    -- Sets the queue to invisible if there are no more notifications in it.
    if queue.last-queue.first == 0 then
        P.setVisible(queue, false)
    end
end

-- Removes a notification at a given index from the queue. Where the 0th item is the newest and the nth the (n+1)th newest.
function P.removeNotification(queueName, index)
    local queue = P.queueList[queueName]
    if queue == nil then
        return
    end

    index = queue.last-tonumber(index)-1
    --if index == queue.first then -- If we want to remove the oldest notification, we can just use pop.
    --    P.popNotification(queueName)
    --    return
    --end

    -- Removes the item.
    local item = queue.items[index]
    queue.window:removeChildWindow(item)
    winMgr:destroyWindow(item)
    queue.items[index] = nil

    -- Move the items below, up.
    local itemHeight = P.itemHeightHelper(queue)
    local moved = false
    if index > queue.first then -- Move all older notifications up in the list.
        for i=index-1,-1,queue.first do
            cout(0, i)
            item = queue.items[i]
            item:setYposition(CEGUI.UDim(0, itemHeight*(queue.last-i-1)))
            queue.items[i+1] = item
        end
    end
    queue.items[queue.first] = nil
    queue.first = queue.first+1

    -- Sets the queue to invisible if there are no more notifications in it.
    if queue.last-queue.first == 0 then
        P.setVisible(queue, false)
    end
end

-- Clears the queue. Removes all notifications from it.
function P.clearQueue(queueName)
    local queue = P.queueList[queueName]
    if queue == nil then
        return
    end
    for i=queue.first,queue.last-1 do
        local item = queue.items[i]
        queue.window:removeChildWindow(item)
        winMgr:destroyWindow(item)
    end
    queue.items = {}
    queue.first = 1
    queue.last = 1

    -- Sets the queue to invisible.
    P.setVisible(queue, false)
end

-- Sets the visibility of the queue.
function P.setVisible(queue, visible)
    if queue == nil then
        return
    end
    queue.window:setVisible(visible)
    queue.visible = visible
end

-- Change the position of the queue.
-- The parameters are (in order) 'name of the queue', 'relative x-position', 'absolute x-position in pixel', 'relative y-position', 'absolute y-position in pixel'.
function P.moveQueue(queueName, relativeXPos, absoluteXPos, relativeYpos, absoluteYPos)
    local queueWindow = P.queueList[queueName].window
    queueWindow:setPosition(CEGUI.UVector2(CEGUI.UDim(relativeXPos, absoluteXPos), CEGUI.UDim(relativeYpos, absoluteYPos)))
end

-- Change the size of the queue.
-- The parameters are (in order) 'name of the queue', 'relative width', 'absolute width in pixel', 'relative height', 'absolute heigth in pixel'.
-- Additionally the last parameter can be ommitted and relativeHeight can be set to the size (i.e. the maximal number of notifications displayed) of the queue, which leads to the height being set such that all notifications can be displayed.
function P.resizeQueue(queueName, relativeWidth, absoluteWidth, relativeHeight, absoluteHeigth)
    local queueWindow = P.queueList[queueName].window
    if queueWindow == nil then
        return
    end
    if absoluteHeigth == nil then
        absoluteHeigth = P.queueHeightHelper(P.queueList[queueName], relativeHeight)
        relativeHeight = 0
    end
    queueWindow:setSize(CEGUI.UVector2(CEGUI.UDim(relativeWidth, absoluteWidth), CEGUI.UDim(relativeHeight, absoluteHeigth)))
end

-- Change the font size and font color of all notifications in a queueHeightHelper
-- The parameters are (in order) 'name of the queue', 'font size', 'ARGB of the font color in hex notation'.
function P.changeQueueFont(queueName, size, color)
    local queue = P.queueList[queueName]
    local queueWindow = queue.window
    if queueWindow == nil then
        return
    end

    queue.fontSize = size
    local changeColor = false
    if color ~= nil then
        queue.fontColor = color
        changeColor = true
    end
    for i=queue.first,queue.last-1 do
        P.setItemFontHelper(queue.items[i], queue, changeColor)
    end
end

-- Helper function to set the font size and color of a item of a queue.
-- The parameters are (in order) 'the ListboxItem', 'the queue table', 'whether color should be changed as well'
function P.setItemFontHelper(item, queue, changeColor)
    --local item = tolua.cast(item, "CEGUI::ListboxTextItem")
    local fontMgr = CEGUI.FontManager:getSingleton()
    if fontMgr:isFontPresent("BlueHighway-" .. queue.fontSize) then
        item:setFont("BlueHighway-" .. queue.fontSize)
    else
        orxonox.GUIManager:addFontHelper("BlueHighway-" .. queue.fontSize, queue.fontSize, "bluehigh.ttf")
        item:setFont("BlueHighway-" .. queue.fontSize)
    end
    if changeColor then
        item:setProperty("TextColours", "tl:" .. queue.fontColor .. " tr:" .. queue.fontColor .. " bl:" .. queue.fontColor .. " br:" .. queue.fontColor .. "")
        cout(0, "tl:[" .. queue.fontColor .. "] tr:[" .. queue.fontColor .. "] bl:[" .. queue.fontColor .. "] br:[" .. queue.fontColor .. "]")
    end
end

-- Enter the edit mode of the notification layer.
function P.enterEditMode()
    P.editMode = true

    local root = winMgr:getWindow("orxonox/NotificationLayer/Root")

    --Add control frame window.
    local window = winMgr:createWindow("MenuWidgets/FrameWindow", "orxonox/NotificationLayer/Root/EditMode/ControlWindow")
    local frame = tolua.cast(window, "CEGUI::FrameWindow")
    frame:setCloseButtonEnabled(false)
    frame:setText("NotificationLayer Control Window")
    frame:setSize(CEGUI.UVector2(CEGUI.UDim(0.7, 0), CEGUI.UDim(0.2, 0)))
    root:addChildWindow(window)
    local pane = winMgr:createWindow("MenuWidgets/ScrollablePane", "orxonox/NotificationLayer/Root/EditMode/ControlWindow/ScrollingPane")
    pane:setSize(CEGUI.UVector2(CEGUI.UDim(1,-20), CEGUI.UDim(1,-30)))
    pane:setPosition(CEGUI.UVector2(CEGUI.UDim(0, 10), CEGUI.UDim(0, 26)))
    window:addChildWindow(pane)

    vertOffset = 0
    horzOffset = 0
    -- Line to be able to create a new queue.
    local newQueueTitle = winMgr:createWindow("MenuWidgets/StaticText", "orxonox/NotificationLayer/Root/EditMode/ControlWindow/NewQueueTitle")
    newQueueTitle:setText("Create a new NotificationQueue:")
    local size = getMinTextSize(newQueueTitle)
    local textHeight = size[1]
    newQueueTitle:setSize(CEGUI.UVector2(CEGUI.UDim(0, size[2]), CEGUI.UDim(0, textHeight)))
    newQueueTitle:setPosition(CEGUI.UVector2(CEGUI.UDim(0, horzOffset), CEGUI.UDim(0, vertOffset)))
    pane:addChildWindow(newQueueTitle)
    horzOffset = horzOffset + size[2] + 5
    local newQueueName = winMgr:createWindow("MenuWidgets/Editbox", "orxonox/NotificationLayer/Root/EditMode/ControlWindow/NewQueueName")
    newQueueName:setProperty("ReadOnly", "set:False")
    newQueueName:setSize(CEGUI.UVector2(CEGUI.UDim(0, size[2]), CEGUI.UDim(0, textHeight)))
    newQueueName:setPosition(CEGUI.UVector2(CEGUI.UDim(0, horzOffset), CEGUI.UDim(0, vertOffset)))
    horzOffset = horzOffset + size[2] + 5
    pane:addChildWindow(newQueueName)
    local create = winMgr:createWindow("MenuWidgets/Button", "orxonox/NotificationLayer/Root/EditMode/ControlWindow/CreateNewQueue")
    create:setText("create")
    P.sampleWindow:setText("create")
    size = getMinTextSize(P.sampleWindow)
    create:setSize(CEGUI.UVector2(CEGUI.UDim(0, size[2]+20), CEGUI.UDim(0, textHeight)))
    create:setPosition(CEGUI.UVector2(CEGUI.UDim(0, horzOffset), CEGUI.UDim(0, vertOffset)))
    orxonox.GUIManager:subscribeEventHelper(create, "Clicked", P.name .. ".createNewQueue_clicked")
    pane:addChildWindow(create)
    horzOffset = horzOffset + size[2]+20 + 5
    vertOffset = vertOffset + textHeight + 5

    horzOffset = 0
    -- Button to leave the edit mode.
    local leave = winMgr:createWindow("MenuWidgets/Button", "orxonox/NotificationLayer/Root/EditMode/ControlWindow/LeaveEditModeButton")
    leave:setText("leave Edit Mode")
    P.sampleWindow:setText("leave Edit Mode")
    size = getMinTextSize(P.sampleWindow)
    leave:setSize(CEGUI.UVector2(CEGUI.UDim(0, size[2]+20), CEGUI.UDim(0, textHeight)))
    leave:setPosition(CEGUI.UVector2(CEGUI.UDim(0, horzOffset), CEGUI.UDim(0, vertOffset)))
    orxonox.GUIManager:subscribeEventHelper(leave, "Clicked", P.name .. ".leaveEditMode_clicked")
    pane:addChildWindow(leave)
    horzOffset = horzOffset + size[2]+20 + 5
    vertOffset = vertOffset + textHeight + 5

    --Replace all queues with FrameWindows
    for k,v in pairs(P.queueList) do
        if v ~= nil then
            local queue = P.queueList[k]
            -- Remove the window that displays the queue from the root window such that it is no longer displayed.
            root:removeChildWindow(v.window)

            -- Create the frame window, with options to edit the queue, that is displayed instead of the queue.
            local window = P.createQueueEditFrame(v.name)
            window:setArea(v.window:getArea()) -- Set the frame window size and position to the same as the queue.

            v.edit = window
        end
    end
end

-- Helper function. Creates a frame for the input queue.
function P.createQueueEditFrame(queueName)
    local root = winMgr:getWindow("orxonox/NotificationLayer/Root")

    window = winMgr:createWindow("MenuWidgets/FrameWindow", "orxonox/NotificationLayer/Root/EditMode/" .. queueName)
    local frame = tolua.cast(window, "CEGUI::FrameWindow")
    frame:setCloseButtonEnabled(true)
    orxonox.GUIManager:subscribeEventHelper(frame, "CloseClicked", P.name .. ".closeQueue_clicked")
    frame:setText("NotificationQueue \"" .. queueName .. "\"")
    root:addChildWindow(window)
    local pane = winMgr:createWindow("MenuWidgets/ScrollablePane", "orxonox/NotificationLayer/Root/EditMode/" .. queueName .. "/ScrollingPane")
    pane:setSize(CEGUI.UVector2(CEGUI.UDim(1,-20), CEGUI.UDim(1,-30)))
    pane:setPosition(CEGUI.UVector2(CEGUI.UDim(0, 10), CEGUI.UDim(0, 26)))
    window:addChildWindow(pane)

    local horzOffset = 0
    local vertOffset = 0

    -- The line that lets you edit the targets of the queue.
    local targetsTitle = winMgr:createWindow("MenuWidgets/StaticText", "orxonox/NotificationLayer/Root/EditMode/" .. queueName .. "/TargetsTitle")
    targetsTitle:setText("Targets:")
    local size = getMinTextSize(targetsTitle)
    local textHeight = size[1]
    targetsTitle:setSize(CEGUI.UVector2(CEGUI.UDim(0, size[2]), CEGUI.UDim(0, textHeight)))
    targetsTitle:setPosition(CEGUI.UVector2(CEGUI.UDim(0, horzOffset), CEGUI.UDim(0, vertOffset)))
    pane:addChildWindow(targetsTitle)
    horzOffset = horzOffset + size[2] + 5
    local targets = winMgr:createWindow("MenuWidgets/Editbox", "orxonox/NotificationLayer/Root/EditMode/" .. queueName .. "/Targets")
    targets:setProperty("ReadOnly", "set:False")
    local targetsText = orxonox.NotificationManager:getInstance():getQueue(queueName):getTargets()
    targets:setText(targetsText)
    P.sampleWindow:setText(targetsText)
    size = getMinTextSize(P.sampleWindow)
    targets:setSize(CEGUI.UVector2(CEGUI.UDim(0, size[2]*2+20), CEGUI.UDim(0, textHeight)))
    targets:setPosition(CEGUI.UVector2(CEGUI.UDim(0, horzOffset), CEGUI.UDim(0, vertOffset)))
    horzOffset = horzOffset + size[2]*2+20 + 5
    pane:addChildWindow(targets)
    local save = winMgr:createWindow("MenuWidgets/Button", "orxonox/NotificationLayer/Root/EditMode/" .. queueName .. "/Targets/Save")
    save:setText("save")
    P.sampleWindow:setText("save")
    size = getMinTextSize(P.sampleWindow)
    local saveTextWidth = size[2]+20
    save:setSize(CEGUI.UVector2(CEGUI.UDim(0, saveTextWidth), CEGUI.UDim(0, textHeight)))
    save:setPosition(CEGUI.UVector2(CEGUI.UDim(0, horzOffset), CEGUI.UDim(0, vertOffset)))
    orxonox.GUIManager:subscribeEventHelper(save, "Clicked", P.name .. ".saveTargets_clicked")
    pane:addChildWindow(save)
    horzOffset = horzOffset + saveTextWidth
    vertOffset = vertOffset + textHeight + 5

    horzOffset = 0
    -- The line that lets you edit the size of the queue.
    local sizeTitle = winMgr:createWindow("MenuWidgets/StaticText", "orxonox/NotificationLayer/Root/EditMode/" .. queueName .. "/SizeTitle")
    sizeTitle:setText("Size:")
    size = getMinTextSize(sizeTitle)
    sizeTitle:setSize(CEGUI.UVector2(CEGUI.UDim(0, size[2]), CEGUI.UDim(0, textHeight)))
    sizeTitle:setPosition(CEGUI.UVector2(CEGUI.UDim(0, horzOffset), CEGUI.UDim(0, vertOffset)))
    pane:addChildWindow(sizeTitle)
    horzOffset = horzOffset + size[2] + 5
    local queueSize = winMgr:createWindow("MenuWidgets/Editbox", "orxonox/NotificationLayer/Root/EditMode/" .. queueName .. "/Size")
    queueSize:setProperty("ReadOnly", "set:False")
    local maxSize = orxonox.NotificationManager:getInstance():getQueue(queueName):getMaxSize()
    queueSize:setText(maxSize)
    P.sampleWindow:setText(maxSize)
    size = getMinTextSize(P.sampleWindow)
    queueSize:setSize(CEGUI.UVector2(CEGUI.UDim(0, size[2]*2+20), CEGUI.UDim(0, textHeight)))
    queueSize:setPosition(CEGUI.UVector2(CEGUI.UDim(0, horzOffset), CEGUI.UDim(0, vertOffset)))
    horzOffset = horzOffset + size[2]*2+20 + 5
    pane:addChildWindow(queueSize)
    save = winMgr:createWindow("MenuWidgets/Button", "orxonox/NotificationLayer/Root/EditMode/" .. queueName .. "/Size/Save")
    save:setText("save")
    P.sampleWindow:setText("save")
    size = getMinTextSize(P.sampleWindow)
    local saveTextWidth = size[2]+20
    save:setSize(CEGUI.UVector2(CEGUI.UDim(0, saveTextWidth), CEGUI.UDim(0, textHeight)))
    save:setPosition(CEGUI.UVector2(CEGUI.UDim(0, horzOffset), CEGUI.UDim(0, vertOffset)))
    orxonox.GUIManager:subscribeEventHelper(save, "Clicked", P.name .. ".saveSize_clicked")
    pane:addChildWindow(save)
    horzOffset = horzOffset + saveTextWidth
    vertOffset = vertOffset + textHeight + 5

    horzOffset = 0
    -- The line that lets you edit the display time of the queue.
    local displayTimeTitle = winMgr:createWindow("MenuWidgets/StaticText", "orxonox/NotificationLayer/Root/EditMode/" .. queueName .. "/DisplayTimeTitle")
    displayTimeTitle:setText("Display time:")
    size = getMinTextSize(displayTimeTitle)
    displayTimeTitle:setSize(CEGUI.UVector2(CEGUI.UDim(0, size[2]), CEGUI.UDim(0, textHeight)))
    displayTimeTitle:setPosition(CEGUI.UVector2(CEGUI.UDim(0, horzOffset), CEGUI.UDim(0, vertOffset)))
    pane:addChildWindow(displayTimeTitle)
    horzOffset = horzOffset + size[2] + 5
    local displayTime = winMgr:createWindow("MenuWidgets/Editbox", "orxonox/NotificationLayer/Root/EditMode/" .. queueName .. "/DisplayTime")
    displayTime:setProperty("ReadOnly", "set:False")
    local time = orxonox.NotificationManager:getInstance():getQueue(queueName):getDisplayTime()
    displayTime:setText(time)
    P.sampleWindow:setText(time)
    size = getMinTextSize(P.sampleWindow)
    displayTime:setSize(CEGUI.UVector2(CEGUI.UDim(0, size[2]*2+20), CEGUI.UDim(0, textHeight)))
    displayTime:setPosition(CEGUI.UVector2(CEGUI.UDim(0, horzOffset), CEGUI.UDim(0, vertOffset)))
    horzOffset = horzOffset + size[2]*2+20 + 5
    pane:addChildWindow(displayTime)
    save = winMgr:createWindow("MenuWidgets/Button", "orxonox/NotificationLayer/Root/EditMode/" .. queueName .. "/DisplayTime/Save")
    save:setText("save")
    P.sampleWindow:setText("save")
    size = getMinTextSize(P.sampleWindow)
    local saveTextWidth = size[2]+20
    save:setSize(CEGUI.UVector2(CEGUI.UDim(0, saveTextWidth), CEGUI.UDim(0, textHeight)))
    save:setPosition(CEGUI.UVector2(CEGUI.UDim(0, horzOffset), CEGUI.UDim(0, vertOffset)))
    orxonox.GUIManager:subscribeEventHelper(save, "Clicked", P.name .. ".saveDisplayTime_clicked")
    pane:addChildWindow(save)
    horzOffset = horzOffset + saveTextWidth
    vertOffset = vertOffset + textHeight + 5

    return window
end

-- Leave the edit mode.
function P.leaveEditMode()
    P.editMode = false

    local root = winMgr:getWindow("orxonox/NotificationLayer/Root")
    --Replace all queues with FrameWindows
    for k,v in pairs(P.queueList) do
        if v ~= nil then
            -- Add the queue window to the root window to have it displayed again.
            root:addChildWindow(v.window)
            -- Set the size and position of the queue window to the size and position of the queue edit frame.
            v.window:setArea(v.edit:getArea())
            -- Destroy the edit frame.
            winMgr:destroyWindow(v.edit)
            v.edit = nil
        end
    end

    --Remove control window
    winMgr:destroyWindow(winMgr:getWindow("orxonox/NotificationLayer/Root/EditMode/ControlWindow"))
end

-- Is called after the sheet has been hidden.
function P.afterHide()
    -- If we leave the edit mode we show the sheet again.
    if P.editMode then
        P.leaveEditMode()
        showMenuSheet(P.name, false, true)
    end
end

-- If the button to save the targets of a queue has been clicked.
function P.saveTargets_clicked(e)
    local we = CEGUI.toWindowEventArgs(e)
    local name = we.window:getName()

    local match = string.gmatch(name, "EditMode/.*/Targets/Save")
    local nameStr = match()
    local queueName = string.sub(nameStr, 10, string.len(nameStr)-13)

    local window = winMgr:getWindow("orxonox/NotificationLayer/Root/EditMode/" .. queueName .. "/Targets")
    local save = winMgr:getWindow("orxonox/NotificationLayer/Root/EditMode/" .. queueName .. "/Targets/Save")
    local width = window:getWidth():asAbsolute(1)

    local queue = orxonox.NotificationManager:getInstance():getQueue(queueName)
    -- Set the new targets.
    queue:setTargets(window:getText())
    local targets = queue:getTargets()

    window:setText(targets)
    P.sampleWindow:setText(targets)
    local size = getMinTextSize(P.sampleWindow)
    -- Adjust the width of the targets field.
    window:setWidth(CEGUI.UDim(0, size[2]*2+20))
    -- Adjust the position of the save button after the targets field.
    save:setXPosition(CEGUI.UDim(0, save:getXPosition():asAbsolute(1)-width+window:getWidth():asAbsolute(1)))
end

-- If the button to save the size if a queue has been clicked.
function P.saveSize_clicked(e)
    local we = CEGUI.toWindowEventArgs(e)
    local name = we.window:getName()

    local match = string.gmatch(name, "EditMode/.*/Size/Save")
    local nameStr = match()
    local queueName = string.sub(nameStr, 10, string.len(nameStr)-10)

    local window = winMgr:getWindow("orxonox/NotificationLayer/Root/EditMode/" .. queueName .. "/Size")
    local save = winMgr:getWindow("orxonox/NotificationLayer/Root/EditMode/" .. queueName .. "/Size/Save")
    local width = window:getWidth():asAbsolute(1)

    local queue = orxonox.NotificationManager:getInstance():getQueue(queueName)
    -- Set the new size.
    queue:setMaxSize(tonumber(window:getText()))
    local maxSize = queue:getMaxSize()

    window:setText(maxSize)
    P.sampleWindow:setText(maxSize)
    local size = getMinTextSize(P.sampleWindow)
    -- Adjust the width of the size field.
    window:setWidth(CEGUI.UDim(0, size[2]*2+20))
    -- Adjust the position of the save button after the size field.
    save:setXPosition(CEGUI.UDim(0, save:getXPosition():asAbsolute(1)-width+window:getWidth():asAbsolute(1)))
end

-- If the button to save the display time if a queue has been clicked.
function P.saveDisplayTime_clicked(e)
    local we = CEGUI.toWindowEventArgs(e)
    local name = we.window:getName()

    local match = string.gmatch(name, "EditMode/.*/DisplayTime/Save")
    local nameStr = match()
    local queueName = string.sub(nameStr, 10, string.len(nameStr)-17)

    local window = winMgr:getWindow("orxonox/NotificationLayer/Root/EditMode/" .. queueName .. "/DisplayTime")
    local save = winMgr:getWindow("orxonox/NotificationLayer/Root/EditMode/" .. queueName .. "/DisplayTime/Save")
    local width = window:getWidth():asAbsolute(1)

    local queue = orxonox.NotificationManager:getInstance():getQueue(queueName)
    -- Set the new display time.
    queue:setDisplayTime(tonumber(window:getText()))
    local time = queue:getDisplayTime()

    window:setText(time)
    P.sampleWindow:setText(time)
    local size = getMinTextSize(P.sampleWindow)
    -- Adjust the width of the display time field.
    window:setWidth(CEGUI.UDim(0, size[2]*2+20))
    -- Adjust the position of the save button after the display time field.
    save:setXPosition(CEGUI.UDim(0, save:getXPosition():asAbsolute(1)-width+window:getWidth():asAbsolute(1)))
end

-- if the button to create a new queue has been clicked.
function P.createNewQueue_clicked(e)
    local window = winMgr:getWindow("orxonox/NotificationLayer/Root/EditMode/ControlWindow/NewQueueName")
    local name = window:getText()

    local queue = P.queueList[name]
    -- Test if a queue with that name already exists.
    if queue ~= nil then
        window:setText("Queue with that name already exists.")
        return
    end

    -- Creates the new queue.
    orxonox.NotificationManager:getInstance():createQueue(name)

    queue = P.queueList[name]
    if queue == nil then
        return
    end

    -- Create the frame that represents the queue in edit mode, since that's what we're in.
    local frame = P.createQueueEditFrame(name)
    local root = winMgr:getWindow("orxonox/NotificationLayer/Root")
    -- Remove the queue window from the root window, since we're in edit mode.
    root:removeChildWindow(queue.window)
    -- Set the frame window size and position to that of the queue window.
    frame:setArea(queue.window:getArea())
    queue.edit = frame

    -- Reset the text to create a new queue.
    window:setText("")
end

-- If the button to leave the edit mode has been clicked.
function P.leaveEditMode_clicked(e)
    hideMenuSheet(P.name)
end

-- If the button to close the queue has been clicked.
function P.closeQueue_clicked(e)
    local we = CEGUI.toWindowEventArgs(e)
    local name = we.window:getName()

    local match = string.gmatch(name, "EditMode/.*")
    local nameStr = match()
    local queueName = string.sub(nameStr, 10, string.len(nameStr))

    -- Destroy the frame window,
    winMgr:destroyWindow(P.queueList[queueName].edit)
    P.queueList[queueName].edit = nil
    -- Destroy the queue.
    orxonox.NotificationManager:getInstance():getQueue(queueName):destroy()
end

-- Helper function. Returns height a queue needs to have to display 'size' items.
function P.queueHeightHelper(queue, size)
    --local listbox = CEGUI.toListbox(queue.window)
    --local item = CEGUI.createListboxTextItem("Text")
    --P.setItemFontHelper(item, queue, false)
    --listbox:addItem(item)
    --local singleItemHeight = listbox:getTotalItemsHeight()
    local singleItemHeight = P.itemHeightHelper(queue)
    --local lookAndFeel = CEGUI.WidgetLookManager:getSingleton():getWidgetLook(queue.window:getLookNFeel())
    --local formattedArea = lookAndFeel:getNamedArea("ItemRenderingArea"):getArea():getPixelRect(queue.window)
    --local frameHeight = queue.window:getUnclippedOuterRect():getHeight() - formattedArea:getHeight()
    --listbox:removeItem(item)
    --return frameHeight + singleItemHeight*size
    return singleItemHeight*size + 1
end

function P.itemHeightHelper(queue)
    local item = winMgr:createWindow("MenuWidgets/StaticText", "orxonox/NotificationLayer/Root/Test/")
    item:setText("text")
    P.setItemFontHelper(item, queue, true)
    queue.window:addChildWindow(item)
    item:setSize(CEGUI.UVector2(CEGUI.UDim(1, 0), CEGUI.UDim(1, 0)))
    item:setProperty("FrameEnabled", "false")
    local height = getStaticTextWindowHeight(item)
    queue.window:removeChildWindow(item)
    winMgr:destroyWindow(item)
    return height
end

return P