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b=538530; add a way to forcibly disable a11y on win32; r=surkov.alexander

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This commit is contained in:
Vladimir Vukicevic 2010-03-09 13:02:25 -08:00
parent 8fcd1b7ebf
commit 0464cc371c
2 changed files with 28 additions and 0 deletions
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4
modules/libpref/src/init/all.js
View File

@ -190,6 +190,10 @@ pref("accessibility.browsewithcaret_shortcut.enabled", true);
pref("accessibility.tabfocus", 7);
pref("accessibility.tabfocus_applies_to_xul", false);
// Forcibly disable a11y on win32, even if something attempts
// to enable it.
pref("accessibility.win32.force_disabled", false);
// On OS X, we follow the "Click in the scrollbar to:" system preference
// unless this preference was set manually
pref("ui.scrollToClick", 0);

24
widget/src/windows/nsWindow.cpp
View File

@ -6487,6 +6487,30 @@ nsWindow::OnIMESelectionChange(void)
#ifdef ACCESSIBILITY
already_AddRefed<nsIAccessible> nsWindow::GetRootAccessible()
{
// We want the ability to forcibly disable a11y on windows, because
// some non-a11y-related components attempt to bring it up. See bug
// 538530 for details; we have a pref here that allows it to be disabled
// for performance and testing resons.
//
// This pref is checked only once, and the browser needs a restart to
// pick up any changes.
static int accForceDisable = -1;
if (accForceDisable == -1) {
nsCOMPtr<nsIPrefBranch> prefs = do_GetService(NS_PREFSERVICE_CONTRACTID);
PRBool b = PR_FALSE;
nsresult rv = prefs->GetBoolPref("accessibility.win32.force_disabled", &b);
if (NS_SUCCEEDED(rv) && b) {
accForceDisable = 1;
} else {
accForceDisable = 0;
}
}
// If the pref was true, return null here, disabling a11y.
if (accForceDisable)
return nsnull;
nsWindow::sIsAccessibilityOn = TRUE;
if (mInDtor || mOnDestroyCalled || mWindowType == eWindowType_invisible) {