brightscript屏幕组件（1）

最新推荐文章于 2024-12-26 11:11:27 发布

原创最新推荐文章于 2024-12-26 11:11:27 发布 · 583 阅读

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本文详细介绍了屏幕组件的创建与配置，包括文字屏幕和海报屏幕，并阐述了事件处理器的作用和屏幕组件事件类型，如按钮点击和屏幕关闭事件。

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屏幕组件

1. roParagrahpScreen(文字屏幕)

    facade = CreateObject("roParagraphScreen")
    m.port = CreateObject("roMessagePort")
    facade.SetMessagePort(m.port)
    facade.AddParagraph("please wait...")
    facade.AddButton(1,"Return")
    facade.Show()    'display

创建屏幕设置屏幕样式

    while true
    msg = wait(100, facade.GetMessagePort())  
    'print "=====";type(timer)
    
    'The channel will exit while time is out.
    if  timer.totalmilliseconds() > 2000 then
        print "timeout exceeded"
        exit while
    end if
    if type(msg) = "roParagraphScreenEvent" then
        if msg.isButtonPressed() =1 then
            if msg.GetIndex() = 1 then
                print "We will return."
                goto posterScreen
                exit while
            end if
            print msg.Getindex()
        else if msg.isScreenClosed()=1 then
            print "screen closed"
            exit while
        end if
    end if
    end while

事件处理器：facade屏幕通过m.port获得Event（isParagraphSrceenEvent）通过wait 等待并接收 event 并处理对应的event

roParagraphScreenEvent
The roParagraphScreen sends the roParagraphScreenEvent with the following predicates that indicate its valid event types:

isButtonPressed() as Boolean
A button on the screen was selected.
GetIndex() as Integer
Returns the ID of the button which was selected (the first parameter to AddButton).
isScreenClosed() as Boolean
The screen was closed and is no longer displayed to the user.

2.roPosterscreen（海报屏幕）

port = CreateObject("roMessagePort")
    poster = CreateObject("roPosterScreen")
    poster.SetBreadcrumbText("[location1]", "[location2]")
    poster.SetMessagePort(port)
    list = CreateObject("roArray", 10, true)
    For i = 0 To 10
    o = CreateObject("roAssociativeArray")
    o.ContentType = "episode"
    o.Title = "[Title]"
    o.ShortDescriptionLine1 = "[ShortDescriptionLine1]"
    o.ShortDescriptionLine2 = "[ShortDescriptionLine2]"
    o.Description = ""
    o.Description = "[Description] "
    o.Rating = "NR"
    o.StarRating = "75"
    o.ReleaseDate = "[<mm/dd/yyyy]"
    o.Length = 5400
    o.Categories = []
    o.Categories.Push("[Category1]")
    o.Categories.Push("[Category2]")
    o.Categories.Push("[Category3]")
    o.Actors = []
    o.Actors.Push("[Actor1]")
    o.Actors.Push("[Actor2]")
    o.Actors.Push("[Actor3]")
    o.Director = "[Director]"
    list.Push(o)
    End For
    poster.SetContentList(list)
    poster.Show()
    While True
        msg = wait(0, port)
        If msg.isScreenClosed() Then
            return -1
        Else If msg.isListItemSelected()
            print "idx: ";msg.GetIndex()
        End If
    End While
End function

关联数组 o 储存了节目的信息并把它赋值给 list数组通过setContentList方法把内容添加到屏幕

while ... end while 为事件处理器