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Updating labels in loop/Preventing GUI flash


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Hey all,

I'm sure this is a real common question but the terms don't lend themselves to googling.

I have a GUI in my AutoIt script, and the main gui contains several labels. I want to update the labels at a 1 second interval (or whatever, more often is cool). and I've been doing it as such:

GUISetState(@SW_SHOW)
While 1
     ; switch GUIGetMsg for event handling
    GUICtrlSetData($DateLabel, "Date: " & _Date_Time_SystemTimeToDateTimeStr(_Date_Time_GetSystemTime))
WEnd

This works as intended, but I see a lot of flickering in the label as it is updated so rapidly.

I tried sleeping in the loop, but as expected it messes up events. I had considered reading milliseconds and updating on certain intervals, say, every 500ms, but I can't find a way to get milliseconds from the date library.

Sorry for obvious questions. I would appreciate any thoughts about methods and best practice. Thanks.

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justin0,

Welcome to the AutoIt forum. :)

The way to prevent the flickering is to check that the value has changed and only update the label when required: ;)

#include <GUIConstantsEx.au3>

$hGUI = GUICreate("Test", 500, 500)

$cLabel = GUICtrlCreateLabel("", 10, 10, 200, 40)
GUICtrlSetFont(-1, 18)

GUISetState()

While 1

    Switch GUIGetMsg()
        Case $GUI_EVENT_CLOSE
            Exit
    EndSwitch

    If GUICtrlRead($cLabel) <> @SEC Then
        GUICtrlSetData($cLabel, @SEC)
    EndIf

WEnd

All clear? :)

M23

Public_Domain.png.2d871819fcb9957cf44f4514551a2935.png Any of my own code posted anywhere on the forum is available for use by others without any restriction of any kind

Open spoiler to see my UDFs:

Spoiler

ArrayMultiColSort ---- Sort arrays on multiple columns
ChooseFileFolder ---- Single and multiple selections from specified path treeview listing
Date_Time_Convert -- Easily convert date/time formats, including the language used
ExtMsgBox --------- A highly customisable replacement for MsgBox
GUIExtender -------- Extend and retract multiple sections within a GUI
GUIFrame ---------- Subdivide GUIs into many adjustable frames
GUIListViewEx ------- Insert, delete, move, drag, sort, edit and colour ListView items
GUITreeViewEx ------ Check/clear parent and child checkboxes in a TreeView
Marquee ----------- Scrolling tickertape GUIs
NoFocusLines ------- Remove the dotted focus lines from buttons, sliders, radios and checkboxes
Notify ------------- Small notifications on the edge of the display
Scrollbars ----------Automatically sized scrollbars with a single command
StringSize ---------- Automatically size controls to fit text
Toast -------------- Small GUIs which pop out of the notification area

 

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