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Changes to Qt Modules in Qt 6 ◦ Porting C++ Applications to Qt 6 using Clazy checks

# Changes to Qt Extras Modules

Qt 6 is a result of the conscious effort to make the framework more efficient and easy to use.

We try to maintain binary and source compatibility for all the public APIs in each release. But some changes were inevitable in an effort to make Qt a better framework.

One of those changes was to remove the platform-specific Extras modules, to ensure a cohesive cross-platform story and future for Qt 6. Most of the the functionality offered by these modules are replaced by a similar functionality in other Qt modules. This guide summarizes those alternatives, and provides guidance for the cases where Qt does not offer a replacement API.

## Changes to Qt Mac Extras

### QtMac namespace

Most members of the QtMac namespace have explicit replacements. The QtMac::fromCGImageRef function has been removed due to lack of known clients of the API.

### QMacPasteboardMime

The QMacPasteboardMime class has been replaced with QUtiMimeConverter. See Changes to Qt GUI#Native clipboard integration for details.

### QMacToolBar

The QMacToolBar and QMacToolBarItem classes have been removed. Use QToolBar as a replacement.

## Changes to Qt Windows Extras

### QtWin namespace

Many members of the QtWin namespace have explicit replacements. To use these replacements with Qt Widgets or Qt Quick, operate on the QWindow representation of the relevant widget or control.

The remaining functions have been removed:

#### errorStringFromHresult

Only used internally in WinExtras. No other known clients of the API.

#### colorizationColor/isCompositionOpaque

Concept exists on other platforms (tint/accent color). Warrants new cross-platform API, for example a new QPalette role or platform theme property.

#### setWindowFlip3DPolicy

Windows 7 feature. No longer supported in Windows 10.

#### extendFrameIntoClientArea

Similar functionality exists on other platforms. Warrants cross-platform QWindow API to control the relationship between the client area and the non-client area (frame/titlebar). See QTBUG-94010 for details.

#### enableBlurBehind

Deprecated as of Windows 8.

#### taskbarActivateTab and taskbar(Add/Delete)Tab

No known clients of the API.

### QWinMime

The QWinMime class has been replaced with QWindowsMimeConverter. See Changes to Qt GUI#Native clipboard integration for details.

### QWinJumpList

The QWinJumpList, QWinJumpListCategory, and QWinJumpListItem classes have been removed due to warranting a cross-platform solution. See QTBUG-94007 for details.

### QWinTaskbarButton

The QWinTaskbarButton and QWinTaskbarProgress classes have been removed due to warranting a cross-platform solution. See QTBUG-94009 and QTBUG-94008 for details.

### QWinThumbnailToolBar

The QWinThumbnailToolBar and QWinThumbnailToolButton classes have been removed due to lack of known clients of the API.

## Changes to Qt X11 Extras

The Qt X11 Extras module was removed in Qt 6.

- For QX11Info::connection(), use QNativeInterface::QX11Application::connection() instead.
- For QX11Info::display(), use QNativeInterface::QX11Application::display() instead.
- For QX11Info::isPlatformX11(), check QNativeInterface::QX11Application existence instead.

Make sure to check you can get a QNativeInterface::QX11Application object from QGuiApplication, as in the following snippet:

         Display *display = nullptr;
         xcb_connection_t *connection = nullptr;
         bool isPlatformX11 = false;
         if (auto *x11Application = qGuiApp->nativeInterface<QNativeInterface::QX11Application>()) {
             display = x11Application->display();
             connection = x11Application->connection();
             isPlatformX11 = true;
         }
         // or
         // isPlatformX11 = qGuiApp->nativeInterface<QNativeInterface::QX11Application>();

Clients that still rely on the functionality in QX11Info class can include the private header `<QtGui/private/qtx11extras_p.h>` as a stopgap solution. To enable private headers use `QT += gui-private` with `qmake`, or add a project dependency to `Qt::GuiPrivate` with `CMake`.

## Changes to Qt for Android Extras

Key functionality from the module has been brought over to other Qt modules.

Clients that still rely on missing functionality can include the private header `<QtCore/private/qandroidextras_p.h>` as a stopgap solution. To enable private headers use `QT += core-private` with `qmake`, or add a project dependency to `Qt::CorePrivate` with `CMake`.

### QAndroidJniObject and QAndroidJniEnvironment

The QAndroidJniObject and QAndroidJniEnvironment classes have been replaced by QJniObject and QJniEnvironment respectively.

The QAndroidJniExceptionCleaner class is no longer needed. See QJniEnvironment::checkAndClearExceptions() for a replacement.

### QtAndroid namespace

Many members of the QtAndroid namespace have replacements in the QAndroidApplication native interface.

### Permissions

The Application Permissions infrastructure allows requesting a set of permissions in a cross-platform manner.

The QtAndroidPrivate namespace can be used to access Android-specific permissions not covered by the cross-platform permissions system.

Changes to Qt Modules in Qt 6 ◦ Porting C++ Applications to Qt 6 using Clazy checks