Windows QPA: Move mime-type related classes to the new interface

Move QWindowsMime (which was a public class in Qt 4 and moved to the QPA
plugin in Qt 5) to the platform namespace and add register functions to the
native application.

Move in test code from QtWinExtras.

Task-number: QTBUG-83252
Change-Id: Iaac440e2d5cb370110919921b1eeb779600b5b65
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>

3 files changed, 103 insertions, 2 deletions

diff --git a/tests/auto/gui/kernel/qclipboard/test/CMakeLists.txt b/tests/auto/gui/kernel/qclipboard/test/CMakeLists.txt
index dfacb03517..1e2c89e538 100644
--- a/tests/auto/gui/kernel/qclipboard/test/CMakeLists.txt
+++ b/tests/auto/gui/kernel/qclipboard/test/CMakeLists.txt
@@ -10,6 +10,7 @@ qt_add_test(tst_qclipboard
         ../tst_qclipboard.cpp
     PUBLIC_LIBRARIES
         Qt::Gui
+        Qt::GuiPrivate
 )
 
 ## Scopes:
diff --git a/tests/auto/gui/kernel/qclipboard/test/test.pro b/tests/auto/gui/kernel/qclipboard/test/test.pro
index 3a4ed3a7bc..8ccdecd405 100644
--- a/tests/auto/gui/kernel/qclipboard/test/test.pro
+++ b/tests/auto/gui/kernel/qclipboard/test/test.pro
@@ -1,7 +1,7 @@
 CONFIG += testcase
 SOURCES  += ../tst_qclipboard.cpp
 TARGET = ../tst_qclipboard
-QT += testlib
+QT += testlib gui-private
 
 osx: LIBS += -framework AppKit
 
diff --git a/tests/auto/gui/kernel/qclipboard/tst_qclipboard.cpp b/tests/auto/gui/kernel/qclipboard/tst_qclipboard.cpp
index d6ce37438b..d4917899db 100644
--- a/tests/auto/gui/kernel/qclipboard/tst_qclipboard.cpp
+++ b/tests/auto/gui/kernel/qclipboard/tst_qclipboard.cpp
@@ -31,12 +31,20 @@
 #include <QtCore/QDebug>
 #include <QtCore/QFileInfo>
 #include <QtCore/QDir>
+#include <QtCore/QVariant>
 #include <QtGui/QGuiApplication>
 #include <QtGui/QClipboard>
 #include <QtGui/QImage>
+#include <QtGui/QPixmap>
 #include <QtGui/QColor>
 #include "../../../shared/platformclipboard.h"
 
+#ifdef Q_OS_WIN
+#  include <QtGui/private/qguiapplication_p.h>
+#  include <QtGui/private/qwindowsmime_p.h>
+#  include <QtGui/qpa/qplatformintegration.h>
+#endif
+
 class tst_QClipboard : public QObject
 {
     Q_OBJECT
@@ -53,7 +61,12 @@ private slots:
     void testSignals();
     void setMimeData();
     void clearBeforeSetText();
-#endif
+#  ifdef Q_OS_WIN
+    void testWindowsMimeRegisterType();
+    void testWindowsMime_data();
+    void testWindowsMime();
+#  endif // Q_OS_WIN
+#endif // clipboard
 };
 
 void tst_QClipboard::initTestCase()
@@ -431,6 +444,93 @@ void tst_QClipboard::clearBeforeSetText()
     QCOMPARE(QGuiApplication::clipboard()->text(), text);
 }
 
+#  ifdef Q_OS_WIN
+
+using QWindowsMime = QPlatformInterface::Private::QWindowsMime;
+using QWindowsApplication = QPlatformInterface::Private::QWindowsApplication;
+
+class TestMime : public QWindowsMime
+{
+public:
+    bool canConvertFromMime(const FORMATETC &, const QMimeData *) const override
+    {
+        return false;
+    }
+
+    bool convertFromMime(const FORMATETC &, const QMimeData *, STGMEDIUM *) const override
+    {
+        return false;
+    }
+
+    QList<FORMATETC> formatsForMime(const QString &, const QMimeData *) const override
+    {
+        formatsForMimeCalled = true;
+        return {};
+    }
+
+    bool canConvertToMime(const QString &, IDataObject *) const override
+    {
+        return false;
+    }
+
+    QVariant convertToMime(const QString &, IDataObject *, QVariant::Type) const override
+    {
+        return QVariant();
+    }
+
+    QString mimeForFormat(const FORMATETC &) const override
+    {
+        return {};
+    }
+
+    mutable bool formatsForMimeCalled = false;
+};
+
+void tst_QClipboard::testWindowsMimeRegisterType()
+{
+    auto nativeWindowsApp = dynamic_cast<QWindowsApplication *>(QGuiApplicationPrivate::platformIntegration());
+    QVERIFY(nativeWindowsApp);
+    const int type = nativeWindowsApp->registerMimeType("foo/bar");
+    QVERIFY2(type >= 0, QByteArray::number(type));
+}
+
+void tst_QClipboard::testWindowsMime_data()
+{
+    QTest::addColumn<QVariant>("data");
+    QTest::newRow("string") << QVariant(QStringLiteral("bla"));
+    QPixmap pm(10, 10);
+    pm.fill(Qt::black);
+    QTest::newRow("pixmap") << QVariant(pm);
+}
+
+void tst_QClipboard::testWindowsMime()
+{
+    QFETCH(QVariant, data);
+    // Basic smoke test for crashes, copy some text into clipboard and check whether
+    // the test implementation is called.
+    TestMime testMime;
+    auto nativeWindowsApp = dynamic_cast<QWindowsApplication *>(QGuiApplicationPrivate::platformIntegration());
+    QVERIFY(nativeWindowsApp);
+    nativeWindowsApp->registerMime(&testMime);
+
+    auto clipboard = QGuiApplication::clipboard();
+    switch (data.type()) {
+    case QVariant::String:
+        clipboard->setText(data.toString());
+        break;
+    case QVariant::Pixmap:
+        clipboard->setPixmap(data.value<QPixmap>());
+        break;
+    default:
+        break;
+    }
+    QTRY_VERIFY(testMime.formatsForMimeCalled);
+
+    nativeWindowsApp->unregisterMime(&testMime);
+}
+
+#  endif // Q_OS_WIN
+
 #endif // QT_CONFIG(clipboard)
 
 QTEST_MAIN(tst_QClipboard)