Clean up windows accessibility backend

What was done:

 * Removed headers in src/gui/accessible/windows/apisupport: as of
   v13.1.0, MinGW supports most of the definitions in these headers.
   Including uiautomation.h should be enough.

 * Removed the QWindowsUiaWrapper class: it's not meant to be extended
   or itself instantiated, is an "ultra-thin" layer (it even preserves
   the "all-caps" Win types of function args), and is in effect only a
   MinGW-bound "kludge". Instead of this class, use the UI Automation
   API directly, with the assumption that it's available and fully
   functional, as specified in the MS docs. Any gaps between this
   assumption and what is delivered by MinGW are bridged with specific
   (and explicit) temporary "kludges".

 * Implemented said specific "kludges" in qwindowsuiautomation. For
   Windows builds, the header just includes uiautomation.h, and the
   .cpp is empty. For MinGW, the header contains definitions still
   missing from uiautomation.h, and the .cpp implements functions
   of the UI Automation core library through imports from the
   uiautomationcore DLL.

 * Windows plugins (and tst_qaccessibility): use the UI Automation API
   definitions directly, instead of the "ultra-thin" wrapper.

 * Windows plugin builds: use uiautomationcore library, if found.

What's intended:

 * Unburden Gui of the Windows UI Automation COM interfaces and other
   definitions that are copied in the uia*.h headers.

 * Make the Windows plugins independent of MinGW shortcomings.

 * Remove the QWindowsUiaWrapper class that essentially only hides these
   shortcomings and the "kludge" code needed to overcome them.

 * As MinGW adds further support to the UI Automation API over time,
   make it noticeable which workarounds are no longer needed. The
   current approach of hiding "kludges" in a wrapper class will also
   hide the fact that they're no longer needed, if/when that time comes.

Change-Id: I0070636817d5de81d0b106e9179e2d0442362e2a
Reviewed-by: Wladimir Leuschner <wladimir.leuschner@qt.io>
Reviewed-by: Oliver Wolff <oliver.wolff@qt.io>

1 files changed, 0 insertions, 54 deletions

diff --git a/src/gui/accessible/windows/apisupport/uiapatternids_p.h b/src/gui/accessible/windows/apisupport/uiapatternids_p.h
deleted file mode 100644
index 676c3fe24e..0000000000
--- a/src/gui/accessible/windows/apisupport/uiapatternids_p.h
+++ /dev/null
@@ -1,54 +0,0 @@
-// Copyright (C) 2017 The Qt Company Ltd.
-// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
-
-#ifndef UIAPATTERNIDS_H
-#define UIAPATTERNIDS_H
-
-//
-//  W A R N I N G
-//  -------------
-//
-// This file is not part of the Qt API. It exists purely as an
-// implementation detail. This header file may change from version to
-// version without notice, or even be removed.
-//
-// We mean it.
-//
-
-#define UIA_InvokePatternId             10000
-#define UIA_SelectionPatternId          10001
-#define UIA_ValuePatternId              10002
-#define UIA_RangeValuePatternId         10003
-#define UIA_ScrollPatternId             10004
-#define UIA_ExpandCollapsePatternId     10005
-#define UIA_GridPatternId               10006
-#define UIA_GridItemPatternId           10007
-#define UIA_MultipleViewPatternId       10008
-#define UIA_WindowPatternId             10009
-#define UIA_SelectionItemPatternId      10010
-#define UIA_DockPatternId               10011
-#define UIA_TablePatternId              10012
-#define UIA_TableItemPatternId          10013
-#define UIA_TextPatternId               10014
-#define UIA_TogglePatternId             10015
-#define UIA_TransformPatternId          10016
-#define UIA_ScrollItemPatternId         10017
-#define UIA_LegacyIAccessiblePatternId  10018
-#define UIA_ItemContainerPatternId      10019
-#define UIA_VirtualizedItemPatternId    10020
-#define UIA_SynchronizedInputPatternId  10021
-#define UIA_ObjectModelPatternId        10022
-#define UIA_AnnotationPatternId         10023
-#define UIA_TextPattern2Id              10024
-#define UIA_StylesPatternId             10025
-#define UIA_SpreadsheetPatternId        10026
-#define UIA_SpreadsheetItemPatternId    10027
-#define UIA_TransformPattern2Id         10028
-#define UIA_TextChildPatternId          10029
-#define UIA_DragPatternId               10030
-#define UIA_DropTargetPatternId         10031
-#define UIA_TextEditPatternId           10032
-#define UIA_CustomNavigationPatternId   10033
-#define UIA_SelectionPattern2Id         10034
-
-#endif