CODEWITHSUNDEEP
c++mfclistcontrol
Clax
Clax

Reputation: 201

UI is freeze while adding items to list control

My app is freeze while I click the button to add items to list control. I'm doing it simple:

for (unsigned i = 1; i < 15000;++i)
{
  listcontrol1.InsertItem(i, L"item list");
}

I also tried using a background thread but the same results. Any idea how to do this correctly without blocking the user interface ?

Upvotes: 0

Views: 354

Answers (2)

mgruber4
mgruber4

Reputation: 754

As Sheng Jiang stated the virtual list is the best solution for such a great list. But you can improve the performance avoiding control paintings during insertion:

listcontrol1.SetRedraw(FALSE);
for (unsigned i = 1; i < 15000; ++i)
{
    listcontrol1.InsertItem(i, L"item list");
}
listcontrol1.SetRedraw(TRUE);

Upvotes: 1

Sheng Jiang 蒋晟
Sheng Jiang 蒋晟

Reputation: 15261

pouring 15k messages into the message pump is going to be slow.

Better use a virtual list control with proper caching. See the VListVW Sample in %Windows SDK Dir%\Samples\winui\controls\common\vlistvw for working code.

Upvotes: 1

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