[Windows, WinCairo] Handle indeterminate state for checkbox in Windows Theme

[Lynn Neir]

Windows theme code is not handling indeterminate state for CheckBox.  Below is additional code that gives indetermine state capability.  Only change is addition of two lines to check for indeterminate state on checkbox and add 8 to the result.

This gives correct rendering for Layout test: fast/forms/indeterminate.html

unsigned RenderThemeWin::determineState(RenderObject* o)
{
    unsigned result = TS_NORMAL;
    ControlPart appearance = o->style()->appearance();
    if (!isEnabled(o))
        result = TS_DISABLED;
    else if (isReadOnlyControl(o) && (TextFieldPart == appearance || TextAreaPart == appearance || SearchFieldPart == appearance))
        result = TFS_READONLY; // Readonly is supported on textfields.
    else if (isPressed(o)) // Active overrides hover and focused.
        result = TS_ACTIVE;
    else if (supportsFocus(appearance) && isFocused(o))
        result = TS_FOCUSED;
    else if (isHovered(o))
        result = TS_HOVER;

    if (isChecked(o))
        result += 4; // 4 unchecked states, 4 checked states.
    else if (isIndeterminate(o) && appearance == CheckboxPart)
        result += 8;

    return result;
}

[Brent Fulgham]

Created attachment 128600 [details]
Correct handling of CheckBox when in indeterminate state

Thanks for the update, Lynn.  I've generated a patch based on your suggested change.

[Adam Roben (:aroben)]

Comment on attachment 128600 [details]
Correct handling of CheckBox when in indeterminate state

View in context: https://bugs.webkit.org/attachment.cgi?id=128600&action=review

> Source/WebCore/ChangeLog:8
> +        Tested by fast/forms/indeterminate.html

I wish we our regression tests actually tested RenderThemeWin! Then we could check in new pixel results for this test.

[WebKit Review Bot]

Comment on attachment 128600 [details]
Correct handling of CheckBox when in indeterminate state

Clearing flags on attachment: 128600

Committed r108791: <http://trac.webkit.org/changeset/108791>

[WebKit Review Bot]

All reviewed patches have been landed.  Closing bug.