1 files changed, 106 insertions, 0 deletions
diff --git a/launcher/ui/instanceview/VisualGroup.h b/launcher/ui/instanceview/VisualGroup.h
new file mode 100644
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+++ b/launcher/ui/instanceview/VisualGroup.h
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+/* 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 <QString>
+#include <QRect>
+#include <QVector>
+#include <QStyleOption>
+
+class InstanceView;
+class QPainter;
+class QModelIndex;
+
+struct VisualRow
+{
+    QList<QModelIndex> items;
+    int height = 0;
+    int top = 0;
+    inline int size() const
+    {
+        return items.size();
+    }
+    inline QModelIndex &operator[](int i)
+    {
+        return items[i];
+    }
+};
+
+struct VisualGroup
+{
+/* constructors */
+    VisualGroup(const QString &text, InstanceView *view);
+    VisualGroup(const VisualGroup *other);
+
+/* data */
+    InstanceView *view = nullptr;
+    QString text;
+    bool collapsed = false;
+    QVector<VisualRow> rows;
+    int firstItemIndex = 0;
+    int m_verticalPosition = 0;
+
+/* logic */
+    /// update the internal list of items and flow them into the rows.
+    void update();
+
+    /// draw the header at y-position.
+    void drawHeader(QPainter *painter, const QStyleOptionViewItem &option);
+
+    /// height of the group, in total. includes a small bit of padding.
+    int totalHeight() const;
+
+    /// height of the group header, in pixels
+    int headerHeight() const;
+
+    /// height of the group content, in pixels
+    int contentHeight() const;
+
+    /// the number of visual rows this group has
+    int numRows() const;
+
+    /// actually calculate the above value
+    int calculateNumRows() const;
+
+    /// the height at which this group starts, in pixels
+    int verticalPosition() const;
+
+    /// relative geometry - top of the row of the given item
+    int rowTopOf(const QModelIndex &index) const;
+
+    /// height of the row of the given item
+    int rowHeightOf(const QModelIndex &index) const;
+
+    /// x/y position of the given item inside the group (in items!)
+    QPair<int, int> positionOf(const QModelIndex &index) const;
+
+    enum HitResult
+    {
+        NoHit = 0x0,
+        TextHit = 0x1,
+        CheckboxHit = 0x2,
+        HeaderHit = 0x4,
+        BodyHit = 0x8
+    };
+    Q_DECLARE_FLAGS(HitResults, HitResult)
+
+    /// shoot! BANG! what did we hit?
+    HitResults hitScan (const QPoint &pos) const;
+
+    QList<QModelIndex> items() const;
+};
+
+Q_DECLARE_OPERATORS_FOR_FLAGS(VisualGroup::HitResults)