Add FontDialog to QtQuick.Dialogs

Adding non-native FontDialog to QtQuick.
This is a native FontDialog on platforms
that support it, and a non-native
Qt Quick FontDialog on platforms that don't.

Fixes: QTBUG-87799
Change-Id: I43a59e3668a8a40f1d0c04a3c2506283d552a22b
Reviewed-by: Mitch Curtis <mitch.curtis@qt.io>

1 files changed, 173 insertions, 0 deletions

diff --git a/src/quickdialogs2/quickdialogs2quickimpl/qquickplatformfontdialog.cpp b/src/quickdialogs2/quickdialogs2quickimpl/qquickplatformfontdialog.cpp
new file mode 100644
index 00000000..e0a91aeb
--- /dev/null
+++ b/src/quickdialogs2/quickdialogs2quickimpl/qquickplatformfontdialog.cpp
@@ -0,0 +1,173 @@
+/****************************************************************************
+**
+** Copyright (C) 2021 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the QtQuick Dialogs module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL3$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see http://www.qt.io/terms-conditions. For further
+** information use the contact form at http://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPLv3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or later as published by the Free
+** Software Foundation and appearing in the file LICENSE.GPL included in
+** the packaging of this file. Please review the following information to
+** ensure the GNU General Public License version 2.0 requirements will be
+** met: http://www.gnu.org/licenses/gpl-2.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qquickplatformfontdialog_p.h"
+
+#include <QtCore/qloggingcategory.h>
+#include <QtGui/qwindow.h>
+#include <QtQml/qqmlcontext.h>
+#include <QtQml/qqmlinfo.h>
+#include <QtQuick/qquickwindow.h>
+#include <QtQuickTemplates2/private/qquickdialog_p.h>
+#include <QtQuickTemplates2/private/qquickpopup_p_p.h>
+#include <QtQuickTemplates2/private/qquickpopupanchors_p.h>
+
+#include "qquickfontdialogimpl_p.h"
+
+QT_BEGIN_NAMESPACE
+
+Q_LOGGING_CATEGORY(lcQuickPlatformFontDialog, "qt.quick.dialogs.quickplatformfontdialog")
+
+/*!
+    \class QQuickPlatformFontDialog
+    \internal
+
+    An interface that QQuickFontDialog can use to access the non-native Qt Quick FontDialog.
+
+    Both this and the native implementations are created in QQuickAbstractDialog::create().
+
+*/
+QQuickPlatformFontDialog::QQuickPlatformFontDialog(QObject *parent)
+{
+    qCDebug(lcQuickPlatformFontDialog)
+            << "creating non-native Qt Quick FontDialog 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 QQuickPlatformFontDialog; can't create "
+                              "non-native FontDialog implementation";
+        return;
+    }
+
+    const auto dialogQmlUrl = QUrl(QStringLiteral(
+            "qrc:/qt-project.org/imports/QtQuick/Dialogs/quickimpl/qml/FontDialog.qml"));
+
+    QQmlComponent fontDialogComponent(qmlContext->engine(), dialogQmlUrl, parent);
+    if (!fontDialogComponent.isReady()) {
+        qmlWarning(parent) << "Failed to load non-native FontDialog implementation:\n"
+                           << fontDialogComponent.errorString();
+        return;
+    }
+
+    m_dialog = qobject_cast<QQuickFontDialogImpl *>(fontDialogComponent.create());
+
+    if (!m_dialog) {
+        qmlWarning(parent) << "Failed to create an instance of the non-native FontDialog:\n"
+                           << fontDialogComponent.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, &QQuickFontDialogImpl::currentFontChanged,
+            this, &QQuickPlatformFontDialog::currentFontChanged);
+    connect(m_dialog, &QQuickFontDialogImpl::fontSelected, this, &QQuickPlatformFontDialog::fontSelected);
+}
+
+bool QQuickPlatformFontDialog::isValid() const
+{
+    return m_dialog;
+}
+
+void QQuickPlatformFontDialog::setCurrentFont(const QFont &font)
+{
+    if (m_dialog)
+        m_dialog->setCurrentFont(font);
+}
+
+QFont QQuickPlatformFontDialog::currentFont() const
+{
+    return m_dialog ? m_dialog->currentFont() : QFont();
+}
+
+void QQuickPlatformFontDialog::exec()
+{
+    qCWarning(lcQuickPlatformFontDialog)
+            << "exec() is not supported for the Qt Quick FontDialog fallback";
+}
+
+bool QQuickPlatformFontDialog::show(Qt::WindowFlags flags, Qt::WindowModality modality,
+                                    QWindow *parent)
+{
+    qCDebug(lcQuickPlatformFontDialog)
+            << "show called with flags" << flags << "modality" << modality << "parent" << parent;
+
+    if (!isValid())
+        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<QFontDialogOptions> options = QPlatformFontDialogHelper::options();
+    m_dialog->setTitle(options->windowTitle());
+    m_dialog->setOptions(options);
+    m_dialog->updateListViews();
+
+    m_dialog->open();
+    return true;
+}
+
+void QQuickPlatformFontDialog::hide()
+{
+    if (isValid())
+        m_dialog->close();
+}
+
+QQuickFontDialogImpl *QQuickPlatformFontDialog::dialog() const
+{
+    return m_dialog;
+}
+
+QT_END_NAMESPACE