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GPinzone

Updating a List View

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GPinzone

I have a disc burning status window that's a List View. I refresh it every two seconds to get the latest info. However, I'd rather not delete (_GUICtrlListView_DeleteAllItems) and repopulate all the entries every two seconds. Is there a way to read the entries in the list view and compare them with the new values?


Gerard J. Pinzonegpinzone AT yahoo.com

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Melba23

GPinzone,

I would almost guarantee that deleting all the entries and reloading will be faster than a loop reading the current entry, comparing it to the new value and then rewriting the entry.

In this quick example script it is a factor of 10 times slower to do the compare:

#include <GUIConstantsEx.au3>
#include <GuiListView.au3>

Global $aList[100]

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

$cLV = GUICtrlCreateListView("Data stored", 10, 10, 400, 400)

For $i = 0 To 99
    GUICtrlCreateListViewItem("Item " & $i, $cLV)
    $aList[$i] = $i
Next

$cAll = GUICtrlCreateButton("All delete", 10, 450, 80, 30)
$cComp = GUICtrlCreateButton("Compare", 250, 450, 80, 30)

GUISetState()

; Alter a single element
$aList[9] = 100

While 1

    Switch GUIGetMsg()
        Case $GUI_EVENT_CLOSE
            Exit
        Case $cAll
            $nBegin = TimerInit()
            _GUICtrlListView_DeleteAllItems($cLV)
            For $i = 0 To 99
                GUICtrlCreateListViewItem("Item " & $i, $cLV)
            Next
            ConsoleWrite(TimerDiff($nBegin) & @CRLF)
        Case $cComp
            For $i = 0 To 99
                If _GUICtrlListView_GetItemText($cLV, $i) <> "Item " & $aList[$i] Then
                    _GUICtrlListView_SetItemText($cLV, $i, "Item " & $aList[$i])
                EndIf
            Next
            ConsoleWrite(TimerDiff($nBegin) & @CRLF)
    EndSwitch

WEnd

M23

  • Like 1

Any of my own code posted anywhere on the forum is available for use by others without any restriction of any kind._______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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GPinzone

What I ended up doing was to keep an array to cache values of the list view and compare it with the "new" array results. If they've changed, I redraw the list view.


Gerard J. Pinzonegpinzone AT yahoo.com

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Melba23

GPinzone,

Sounds a very sensible solution.

M23

  • Like 1

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