1 files changed, 153 insertions, 0 deletions
diff --git a/launcher/ui/instanceview/InstanceView.h b/launcher/ui/instanceview/InstanceView.h
new file mode 100644
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--- /dev/null
+++ b/launcher/ui/instanceview/InstanceView.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 <QListView>
+#include <QLineEdit>
+#include <QScrollBar>
+#include <QCache>
+#include "VisualGroup.h"
+#include <functional>
+
+struct InstanceViewRoles
+{
+    enum
+    {
+        GroupRole = Qt::UserRole,
+        ProgressValueRole,
+        ProgressMaximumRole
+    };
+};
+
+class InstanceView : public QAbstractItemView
+{
+    Q_OBJECT
+
+public:
+    InstanceView(QWidget *parent = 0);
+    ~InstanceView();
+
+    void setModel(QAbstractItemModel *model) override;
+
+    using visibilityFunction = std::function<bool(const QString &)>;
+    void setSourceOfGroupCollapseStatus(visibilityFunction f) {
+        fVisibility = f;
+    }
+
+    /// return geometry rectangle occupied by the specified model item
+    QRect geometryRect(const QModelIndex &index) const;
+    /// return visual rectangle occupied by the specified model item
+    virtual QRect visualRect(const QModelIndex &index) const override;
+    /// get the model index at the specified visual point
+    virtual QModelIndex indexAt(const QPoint &point) const override;
+    QString groupNameAt(const QPoint &point);
+    void setSelection(const QRect &rect, const QItemSelectionModel::SelectionFlags commands) override;
+
+    virtual int horizontalOffset() const override;
+    virtual int verticalOffset() const override;
+    virtual void scrollContentsBy(int dx, int dy) override;
+    virtual void scrollTo(const QModelIndex &index, ScrollHint hint = EnsureVisible) override;
+
+    virtual QModelIndex moveCursor(CursorAction cursorAction, Qt::KeyboardModifiers modifiers) override;
+
+    virtual QRegion visualRegionForSelection(const QItemSelection &selection) const override;
+
+    int spacing() const
+    {
+        return m_spacing;
+    };
+
+public slots:
+    virtual void updateGeometries() override;
+
+protected slots:
+    virtual void dataChanged(const QModelIndex &topLeft, const QModelIndex &bottomRight, const QVector<int> &roles) override;
+    virtual void rowsInserted(const QModelIndex &parent, int start, int end) override;
+    virtual void rowsAboutToBeRemoved(const QModelIndex &parent, int start, int end) override;
+    void modelReset();
+    void rowsRemoved();
+    void currentChanged(const QModelIndex &current, const QModelIndex &previous) override;
+
+signals:
+    void droppedURLs(QList<QUrl> urls);
+    void groupStateChanged(QString group, bool collapsed);
+
+protected:
+    bool isIndexHidden(const QModelIndex &index) const override;
+    void mousePressEvent(QMouseEvent *event) override;
+    void mouseMoveEvent(QMouseEvent *event) override;
+    void mouseReleaseEvent(QMouseEvent *event) override;
+    void mouseDoubleClickEvent(QMouseEvent *event) override;
+    void paintEvent(QPaintEvent *event) override;
+    void resizeEvent(QResizeEvent *event) override;
+
+    void dragEnterEvent(QDragEnterEvent *event) override;
+    void dragMoveEvent(QDragMoveEvent *event) override;
+    void dragLeaveEvent(QDragLeaveEvent *event) override;
+    void dropEvent(QDropEvent *event) override;
+
+    void startDrag(Qt::DropActions supportedActions) override;
+
+    void updateScrollbar();
+
+private:
+    friend struct VisualGroup;
+    QList<VisualGroup *> m_groups;
+
+    visibilityFunction fVisibility;
+
+    // geometry
+    int m_leftMargin = 5;
+    int m_rightMargin = 5;
+    int m_bottomMargin = 5;
+    int m_categoryMargin = 5;
+    int m_spacing = 5;
+    int m_itemWidth = 100;
+    int m_currentItemsPerRow = -1;
+    int m_currentCursorColumn= -1;
+    mutable QCache<int, QRect> geometryCache;
+
+    // point where the currently active mouse action started in geometry coordinates
+    QPoint m_pressedPosition;
+    QPersistentModelIndex m_pressedIndex;
+    bool m_pressedAlreadySelected;
+    VisualGroup *m_pressedCategory;
+    QItemSelectionModel::SelectionFlag m_ctrlDragSelectionFlag;
+    QPoint m_lastDragPosition;
+
+    VisualGroup *category(const QModelIndex &index) const;
+    VisualGroup *category(const QString &cat) const;
+    VisualGroup *categoryAt(const QPoint &pos, VisualGroup::HitResults & result) const;
+
+    int itemsPerRow() const
+    {
+        return m_currentItemsPerRow;
+    };
+    int contentWidth() const;
+
+private: /* methods */
+    int itemWidth() const;
+    int calculateItemsPerRow() const;
+    int verticalScrollToValue(const QModelIndex &index, const QRect &rect, QListView::ScrollHint hint) const;
+    QPixmap renderToPixmap(const QModelIndexList &indices, QRect *r) const;
+    QList<QPair<QRect, QModelIndex>> draggablePaintPairs(const QModelIndexList &indices, QRect *r) const;
+
+    bool isDragEventAccepted(QDropEvent *event);
+
+    QPair<VisualGroup *, VisualGroup::HitResults> rowDropPos(const QPoint &pos);
+
+    QPoint offset() const;
+};