【界面UI】NPC 对话框：打字机效果与选项按钮

---NPC 对话：逐字显示的打字机
Dialog.lines = {}
Dialog.lineIdx = 1
Dialog.charIdx = 0

function Dialog.start(npcName, lines)
    Dialog.lines = lines
    Dialog.lineIdx = 1
    Dialog.charIdx = 0
    GUI:Text_Create(Dialog.win, "npc_name", 10, 8, 13,
        "#FFAA00", npcName)
    Dialog.label = GUI:Text_Create(Dialog.win, "text",
        10, 34, 12, "#FFFFFF", "")
    SL:Schedule(0.04, Dialog.typeNext)
end

function Dialog.typeNext()
    local line = Dialog.lines[Dialog.lineIdx]
    if not line then return end
    Dialog.charIdx = Dialog.charIdx + 1
    GUI:Text_setString(Dialog.label,
        line:sub(1, Dialog.charIdx))
    if Dialog.charIdx >= #line then
        Dialog.showOptions()
        SL:StopSchedule(Dialog.typeNext)
    end
end

---选项按钮：分支的呈现与提交
function Dialog.showOptions()
    local opts = Dialog.current.options or {}
    for i, opt in ipairs(opts) do
        local btn = GUI:Button_Create(Dialog.win,
            "opt" .. i, 10, 120 + (i - 1) * 36)
        GUI:Button_setTitleText(btn, opt.text)
        GUI:addOnClickEvent(btn, function()
            SL:SendNetMsg(MSGID.NPC_OPTION,
                Dialog.npcId, opt.idx, 0, "")
            Dialog.close()
        end)
    end
end