Renamed views_qtwidgets/ into qtwidgets/views/

As there will be some files that are specific to QtWidgets and
but aren't views

src/qtwidgets/views/DockWidget_qtwidgets.cpp

@@ -0,0 +1,92 @@
+/*
+  This file is part of KDDockWidgets.
+
+  SPDX-FileCopyrightText: 2019-2022 Klarälvdalens Datakonsult AB, a KDAB Group company <info@kdab.com>
+  Author: Sérgio Martins <sergio.martins@kdab.com>
+
+  SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only
+
+  Contact KDAB at <info@kdab.com> for commercial licensing options.
+*/
+
+#include "DockWidget_qtwidgets.h"
+
+#include <QCloseEvent>
+#include <QVBoxLayout>
+
+/**
+ * @file
+ * @brief Represents a dock widget.
+ *
+ * @author Sérgio Martins \<sergio.martins@kdab.com\>
+ */
+
+using namespace KDDockWidgets;
+using namespace KDDockWidgets::Controllers;
+using namespace KDDockWidgets::Views;
+
+class DockWidget_qtwidgets::Private
+{
+public:
+    Private(DockWidget_qtwidgets *q, Controllers::DockWidget *controller)
+        : layout(new QVBoxLayout(q))
+        , m_controller(controller)
+    {
+        layout->setSpacing(0);
+        layout->setContentsMargins(0, 0, 0, 0);
+
+        // propagate the max-size constraints from the guest widget to the DockWidget
+        layout->setSizeConstraint(QLayout::SetMinAndMaxSize);
+    }
+
+    QVBoxLayout *const layout;
+    Controllers::DockWidget *const m_controller;
+};
+
+DockWidget_qtwidgets::DockWidget_qtwidgets(Controllers::DockWidget *controller,
+                                           Qt::WindowFlags windowFlags)
+    : View_qtwidgets<QWidget>(controller, Type::DockWidget, nullptr, windowFlags)
+    , d(new Private(this, controller))
+{
+}
+
+DockWidget_qtwidgets::~DockWidget_qtwidgets()
+{
+    delete d;
+}
+
+void DockWidget_qtwidgets::init()
+{
+    connect(d->m_controller, &DockWidgetBase::widgetChanged, this, [this](QWidget *w) {
+        d->layout->addWidget(w);
+    });
+}
+
+Controllers::DockWidget *DockWidget_qtwidgets::dockWidget() const
+{
+    return d->m_controller;
+}
+
+bool DockWidget_qtwidgets::event(QEvent *e)
+{
+    if (e->type() == QEvent::ParentChange) {
+        d->m_controller->onParentChanged();
+    } else if (e->type() == QEvent::Show) {
+        d->m_controller->onShown(e->spontaneous());
+    } else if (e->type() == QEvent::Hide) {
+        d->m_controller->onHidden(e->spontaneous());
+    }
+
+    return QWidget::event(e);
+}
+
+void DockWidget_qtwidgets::closeEvent(QCloseEvent *e)
+{
+    d->m_controller->onCloseEvent(e);
+}
+
+void DockWidget_qtwidgets::resizeEvent(QResizeEvent *e)
+{
+    d->m_controller->onResize(e->size());
+    return QWidget::resizeEvent(e);
+}