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Windows: Don't force native file dialogs to index compressed files

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We use QWindowsShellItem to hook into the native windows file dialog
and interface correctly with special windows folders. We create objects
of QWindowsShellItem e.g. when the user selects a file. We then probe
the shell item for various attributes, e.g. to see if it represents a
folder.

The selected item might be a compress archive of significant size, and
checking whether that archive is a folder can take significant amount
of time during which the UI is completely blocked.

To prevent that, first check whether the item is a compress item, or a
stream, and if so, don't check whether it has sub-folders.

Also, don't use the SFGAO_DISPLAYATTRMASK value, which the API
documentation [1] explicitly documents as "Don't use".

[1] https://learn.microsoft.com/en-us/windows/win32/shell/sfgao

Fixes: QTBUG-107618
Pick-to: 6.4
Change-Id: Ifcdec53ec3f8a0236d849a0b72a71afbd03d8290
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>
This commit is contained in:
Volker Hilsheimer 2022-10-20 12:58:39 +02:00
parent 63cfab628a
commit 933eb68a9d
1 changed files with 11 additions and 1 deletions
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12
src/plugins/platforms/windows/qwindowsdialoghelpers.cpp
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@ -544,8 +544,18 @@ QWindowsShellItem::QWindowsShellItem(IShellItem *item)
: m_item(item)
, m_attributes(0)
{
if (FAILED(item->GetAttributes(SFGAO_CAPABILITYMASK | SFGAO_DISPLAYATTRMASK | SFGAO_CONTENTSMASK | SFGAO_STORAGECAPMASK, &m_attributes)))
SFGAOF mask = (SFGAO_CAPABILITYMASK | SFGAO_CONTENTSMASK | SFGAO_STORAGECAPMASK);
// Check for attributes which might be expensive to enumerate for subfolders
if (FAILED(item->GetAttributes((SFGAO_STREAM | SFGAO_COMPRESSED), &m_attributes))) {
m_attributes = 0;
} else {
// If the item is compressed or stream, skip expensive subfolder test
if (m_attributes & (SFGAO_STREAM | SFGAO_COMPRESSED))
mask &= ~SFGAO_HASSUBFOLDER;
if (FAILED(item->GetAttributes(mask, &m_attributes)))
m_attributes = 0;
}
}
QString QWindowsShellItem::path() const