1 files changed, 111 insertions, 0 deletions
diff --git a/src/quickdialogs/quickdialogsquickimpl/qquickplatformmessagedialog.cpp b/src/quickdialogs/quickdialogsquickimpl/qquickplatformmessagedialog.cpp
new file mode 100644
index 0000000000..a9f1e858ed
--- /dev/null
+++ b/src/quickdialogs/quickdialogsquickimpl/qquickplatformmessagedialog.cpp
@@ -0,0 +1,111 @@
+// Copyright (C) 2021 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
+
+#include "qquickplatformmessagedialog_p.h"
+
+#include <QtQuickTemplates2/private/qquickpopup_p_p.h>
+#include <QtQuickTemplates2/private/qquickpopupanchors_p.h>
+
+#include "qquickmessagedialogimpl_p.h"
+
+QT_BEGIN_NAMESPACE
+
+Q_LOGGING_CATEGORY(lcQuickPlatformMessageDialog, "qt.quick.dialogs.quickplatformmessagedialog")
+
+QQuickPlatformMessageDialog::QQuickPlatformMessageDialog(QObject *parent)
+{
+    qCDebug(lcQuickPlatformMessageDialog)
+            << "creating non-native Qt Quick MessageDialog with parent" << parent;
+
+    // Set a parent so that we get deleted if we can't be shown for whatever reason.
+    // Our eventual parent should be the window, though.
+    setParent(parent);
+
+    auto qmlContext = ::qmlContext(parent);
+    if (!qmlContext) {
+        qmlWarning(parent) << "No QQmlContext for QQuickPlatformMessageDialog; can't create "
+                              "non-native MessageDialog implementation";
+        return;
+    }
+
+    const auto dialogQmlUrl = QUrl(QStringLiteral(
+            "qrc:/qt-project.org/imports/QtQuick/Dialogs/quickimpl/qml/MessageDialog.qml"));
+
+    QQmlComponent messageDialogComponent(qmlContext->engine(), dialogQmlUrl, parent);
+    if (!messageDialogComponent.isReady()) {
+        qmlWarning(parent) << "Failed to load non-native MessageBox implementation:\n"
+                           << messageDialogComponent.errorString();
+        return;
+    }
+
+    m_dialog = qobject_cast<QQuickMessageDialogImpl *>(messageDialogComponent.create());
+
+    if (!m_dialog) {
+        qmlWarning(parent) << "Failed to create an instance of the non-native MessageBox:\n"
+                           << messageDialogComponent.errorString();
+        return;
+    }
+
+    m_dialog->setParent(this);
+
+    connect(m_dialog, &QQuickDialog::accepted, this, &QPlatformDialogHelper::accept);
+    connect(m_dialog, &QQuickDialog::rejected, this, &QPlatformDialogHelper::reject);
+    connect(m_dialog, &QQuickMessageDialogImpl::buttonClicked, this,
+            &QQuickPlatformMessageDialog::clicked);
+}
+
+void QQuickPlatformMessageDialog::exec()
+{
+    qCWarning(lcQuickPlatformMessageDialog)
+            << "exec() is not supported for the Qt Quick MessageDialog fallback";
+}
+
+bool QQuickPlatformMessageDialog::show(Qt::WindowFlags flags, Qt::WindowModality modality,
+                                       QWindow *parent)
+{
+    qCDebug(lcQuickPlatformMessageDialog)
+            << "show called with flags" << flags << "modality" << modality << "parent" << parent;
+    if (!m_dialog)
+        return false;
+
+    if (!parent)
+        return false;
+
+    auto quickWindow = qobject_cast<QQuickWindow *>(parent);
+    if (!quickWindow) {
+        qmlInfo(this->parent()) << "Parent window (" << parent
+                                << ") of non-native dialog is not a QQuickWindow";
+        return false;
+    }
+    m_dialog->setParent(parent);
+    m_dialog->resetParentItem();
+
+    auto popupPrivate = QQuickPopupPrivate::get(m_dialog);
+    popupPrivate->getAnchors()->setCenterIn(m_dialog->parentItem());
+
+    QSharedPointer<QMessageDialogOptions> options = QPlatformMessageDialogHelper::options();
+    m_dialog->setTitle(options->windowTitle());
+    m_dialog->setOptions(options);
+
+    m_dialog->open();
+    return true;
+}
+void QQuickPlatformMessageDialog::hide()
+{
+    if (isValid())
+        m_dialog->close();
+}
+
+bool QQuickPlatformMessageDialog::isValid() const
+{
+    return m_dialog;
+}
+
+QQuickMessageDialogImpl *QQuickPlatformMessageDialog::dialog() const
+{
+    return m_dialog;
+}
+
+QT_END_NAMESPACE
+
+#include "moc_qquickplatformmessagedialog_p.cpp"