Bug 38779 – [Qt] QWebPage::inputMethodQuery() returns wrong values for Qt::ImCursorPosition, Qt::ImAnchorPosition

• Component: WebKit Qt
• Status: CLOSED FIXED

QWebPage::inputMethodQuery(Qt::ImCursorPosition) returns the end index (renderTextControl->selectionEnd()) of a selection inside an input field instead of the current cursor position. 

QWebPage::inputMethodQuery(Qt::ImAnchorPosition) returns the start index (renderTextControl->selectionStart()) of a selection inside an input field instead of the anchor position.

To be specific: In Webkit, the START and END indices always correspond to the left and right edges of a selection irrespective of the current cursor direction. The bug is that the current implementation of QWebPage::inputMethodQuery() assumes incorrectly that the anchor position is the START index and that the current cursor position always corresponds to the END index.

I am working on a patch for submission.

[Jesus Sanchez-Palencia]

(In reply to comment #1)
> I am working on a patch for submission.

Please consider adding an auto-test to it.

(In reply to comment #2)
> (In reply to comment #1)
> > I am working on a patch for submission.
> Please consider adding an auto-test to it.

Thanks! Just to clarify:
I am working on a patch (including the fix and auto-tests) for submission.

Created attachment 56206 [details]
Prosposed patch to fix the return values for Qt::ImCursorPosition and Qt::ImAnchorPosition in QWebPage::inputMethodQuery() when the Editor doesn't have a composition.

The patch fixes the issue of incorrect values been returned for Qt::ImCursorPosition and Qt::ImAnchorPosition in QWebPage::inputMethodQuery() when the Editor doesn't have a composition.

[Robert Hogan]

So is it not solvable when in Composition mode? Or not relevant? (Not a loaded question, genuinely don't know.)

(In reply to comment #5)
> So is it not solvable when in Composition mode? Or not relevant? (Not a loaded question, genuinely don't know.)

Sorry I wasn't specific. The values seem to be correct in Composition mode. I don't think there is a bug in that case.

[Robert Hogan]

(In reply to comment #6)
> (In reply to comment #5)
> > So is it not solvable when in Composition mode? Or not relevant? (Not a loaded question, genuinely don't know.)
> 
> Sorry I wasn't specific. The values seem to be correct in Composition mode. I don't think there is a bug in that case.

Funny, tst_qwebpage has:

    //Set selection with negative length
    inputAttributes << QInputMethodEvent::Attribute(QInputMethodEvent::Selection, 6, -5, QVariant());
    QInputMethodEvent eventSelection3("",inputAttributes);
    page->event(&eventSelection3);

    //ImAnchorPosition
    variant = page->inputMethodQuery(Qt::ImAnchorPosition);
    anchorPosition =  variant.toInt();
    QCOMPARE(anchorPosition, 1);

    //ImCursorPosition
    variant = page->inputMethodQuery(Qt::ImCursorPosition);
    cursorPosition =  variant.toInt();
    QCOMPARE(cursorPosition, 6);

which would suggest the opposite to me, but I don't know too much about input methods.

(In reply to comment #7)
> (In reply to comment #6)
> > (In reply to comment #5)
> > > So is it not solvable when in Composition mode? Or not relevant? (Not a loaded question, genuinely don't know.)
> > 
> > Sorry I wasn't specific. The values seem to be correct in Composition mode. I don't think there is a bug in that case.
> Funny, tst_qwebpage has:
>     //Set selection with negative length
>     inputAttributes << QInputMethodEvent::Attribute(QInputMethodEvent::Selection, 6, -5, QVariant());
>     QInputMethodEvent eventSelection3("",inputAttributes);
>     page->event(&eventSelection3);
>     //ImAnchorPosition
>     variant = page->inputMethodQuery(Qt::ImAnchorPosition);
>     anchorPosition =  variant.toInt();
>     QCOMPARE(anchorPosition, 1);
>     //ImCursorPosition
>     variant = page->inputMethodQuery(Qt::ImCursorPosition);
>     cursorPosition =  variant.toInt();
>     QCOMPARE(cursorPosition, 6);
> which would suggest the opposite to me, but I don't know too much about input methods.

This test case causes the Editor to go into composistion mode and therefore QWebPage::inputMethodQuery() returns the correct values. I don't know whether it is supposed to go into composition mode in this case or not (And that is the concern I raised in an email to you last week since this test case was part of your commit #58218). The test case I am fixing is when the editor is not in composition mode and is different than this.

[Simon Hausmann]

Comment on attachment 56206 [details]
Prosposed patch to fix the return values for Qt::ImCursorPosition and Qt::ImAnchorPosition in QWebPage::inputMethodQuery() when the Editor doesn't have a composition.

r=me

[WebKit Commit Bot]

Comment on attachment 56206 [details]
Prosposed patch to fix the return values for Qt::ImCursorPosition and Qt::ImAnchorPosition in QWebPage::inputMethodQuery() when the Editor doesn't have a composition.

Clearing flags on attachment: 56206

Committed r59833: <http://trac.webkit.org/changeset/59833>

[WebKit Commit Bot]

All reviewed patches have been landed.  Closing bug.

[Simon Hausmann]

Revision r59833 cherry-picked into qtwebkit-2.0 with commit cf6ec10122bf813a16705f55b29f522a78ce83de