NOISSUE continue reshuffling the codebase

launcher/ui/widgets/VersionListView.h

@@ -0,0 +1,56 @@
+/* Copyright 2013-2021 MultiMC Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+#include <QTreeView>
+
+class VersionListView : public QTreeView
+{
+    Q_OBJECT
+public:
+
+    explicit VersionListView(QWidget *parent = 0);
+    virtual void paintEvent(QPaintEvent *event) override;
+    virtual void setModel(QAbstractItemModel* model) override;
+
+    enum EmptyMode
+    {
+        Empty,
+        String,
+        ErrorString
+    };
+
+    void setEmptyString(QString emptyString);
+    void setEmptyErrorString(QString emptyErrorString);
+    void setEmptyMode(EmptyMode mode);
+
+public slots:
+    virtual void reset() override;
+
+protected slots:
+    virtual void rowsAboutToBeRemoved(const QModelIndex & parent, int start, int end) override;
+    virtual void rowsInserted(const QModelIndex &parent, int start, int end) override;
+
+private: /* methods */
+    void paintInfoLabel(QPaintEvent *event) const;
+    void updateEmptyViewPort();
+    QString currentEmptyString() const;
+
+private: /* variables */
+    int m_itemCount = 0;
+    QString m_emptyString;
+    QString m_emptyErrorString;
+    EmptyMode m_emptyMode = Empty;
+};