Long live Qt 4.5!

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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 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 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QHEADERVIEW_P_H
+#define QHEADERVIEW_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists purely as an
+// implementation detail.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include "private/qabstractitemview_p.h"
+
+#ifndef QT_NO_ITEMVIEWS
+
+#include "QtCore/qbitarray.h"
+#include "QtGui/qapplication.h"
+#include "QtGui/qlabel.h"
+
+QT_BEGIN_NAMESPACE
+
+class QHeaderViewPrivate: public QAbstractItemViewPrivate
+{
+    Q_DECLARE_PUBLIC(QHeaderView)
+
+public:
+    enum StateVersion { VersionMarker = 0xff };
+
+    QHeaderViewPrivate()
+        : state(NoState),
+          offset(0),
+          sortIndicatorOrder(Qt::DescendingOrder),
+          sortIndicatorSection(0),
+          sortIndicatorShown(false),
+          lastPos(-1),
+          firstPos(-1),
+          originalSize(-1),
+          section(-1),
+          target(-1),
+          pressed(-1),
+          hover(-1),
+          length(0),
+          sectionCount(0),
+          movableSections(false),
+          clickableSections(false),
+          highlightSelected(false),
+          stretchLastSection(false),
+          cascadingResizing(false),
+          forceInitializing(false),
+          stretchSections(0),
+          contentsSections(0),
+          minimumSectionSize(-1),
+          lastSectionSize(0),
+          sectionIndicatorOffset(0),
+          sectionIndicator(0),
+          globalResizeMode(QHeaderView::Interactive)
+    {}
+
+
+    int lastVisibleVisualIndex() const;
+    int sectionHandleAt(int position);
+    void setupSectionIndicator(int section, int position);
+    void updateSectionIndicator(int section, int position);
+    void updateHiddenSections(int logicalFirst, int logicalLast);
+    void resizeSections(QHeaderView::ResizeMode globalMode, bool useGlobalMode = false);
+    void _q_sectionsRemoved(const QModelIndex &,int,int);
+    void _q_layoutAboutToBeChanged();
+    void _q_layoutChanged();
+
+    bool isSectionSelected(int section) const;
+
+    inline bool rowIntersectsSelection(int row) const {
+        return (selectionModel ? selectionModel->rowIntersectsSelection(row, root) : false);
+    }
+
+    inline bool columnIntersectsSelection(int column) const {
+        return (selectionModel ? selectionModel->columnIntersectsSelection(column, root) : false);
+    }
+
+    inline bool sectionIntersectsSelection(int logical) const {
+        return (orientation == Qt::Horizontal ? columnIntersectsSelection(logical) : rowIntersectsSelection(logical));
+    }
+
+    inline bool isRowSelected(int row) const {
+        return (selectionModel ? selectionModel->isRowSelected(row, root) : false);
+    }
+
+    inline bool isColumnSelected(int column) const {
+        return (selectionModel ? selectionModel->isColumnSelected(column, root) : false);
+    }
+
+    inline void prepareSectionSelected() {
+        if (!selectionModel || !selectionModel->hasSelection())
+            sectionSelected.clear();
+        else if (sectionSelected.count() != sectionCount * 2)
+            sectionSelected.fill(false, sectionCount * 2);
+        else sectionSelected.fill(false);
+    }
+
+    inline bool reverse() const {
+        return orientation == Qt::Horizontal && q_func()->isRightToLeft();
+    }
+
+    inline int logicalIndex(int visualIndex) const {
+        return logicalIndices.isEmpty() ? visualIndex : logicalIndices.at(visualIndex);
+    }
+
+    inline int visualIndex(int logicalIndex) const {
+        return visualIndices.isEmpty() ? logicalIndex : visualIndices.at(logicalIndex);
+    }
+
+    inline void setDefaultValues(Qt::Orientation o) {
+        orientation = o;
+        defaultSectionSize = (o == Qt::Horizontal ? 100
+                              : qMax(q_func()->minimumSectionSize(), 30));
+        defaultAlignment = (o == Qt::Horizontal
+                            ? Qt::Alignment(Qt::AlignCenter)
+                            : Qt::AlignLeft|Qt::AlignVCenter);
+    }
+
+    inline bool isVisualIndexHidden(int visual) const {
+        return !sectionHidden.isEmpty() && sectionHidden.at(visual);
+    }
+
+    inline void setVisualIndexHidden(int visual, bool hidden) {
+        if (!sectionHidden.isEmpty()) sectionHidden.setBit(visual, hidden);
+    }
+
+    inline QHeaderView::ResizeMode visualIndexResizeMode(int visual) const {
+        return headerSectionResizeMode(visual);
+    }
+
+    inline bool hasAutoResizeSections() const {
+        return stretchSections || stretchLastSection || contentsSections;
+    }
+
+    QStyleOptionHeader getStyleOption() const;
+
+    inline void invalidateCachedSizeHint() const {
+        cachedSizeHint = QSize();
+    }
+
+    inline void initializeIndexMapping() const {
+        if (visualIndices.count() != sectionCount
+            || logicalIndices.count() != sectionCount) {
+            visualIndices.resize(sectionCount);
+            logicalIndices.resize(sectionCount);
+            for (int s = 0; s < sectionCount; ++s) {
+                visualIndices[s] = s;
+                logicalIndices[s] = s;
+            }
+        }
+    }
+
+    inline void clearCascadingSections() {
+        firstCascadingSection = sectionCount;
+        lastCascadingSection = 0;
+        cascadingSectionSize.clear();
+    }
+
+    inline void saveCascadingSectionSize(int visual, int size) {
+        if (!cascadingSectionSize.contains(visual)) {
+            cascadingSectionSize.insert(visual, size);
+            firstCascadingSection = qMin(firstCascadingSection, visual);
+            lastCascadingSection = qMax(lastCascadingSection, visual);
+        }
+    }
+
+    inline bool sectionIsCascadable(int visual) const {
+        return visualIndexResizeMode(visual) == QHeaderView::Interactive;
+    }
+
+    inline int modelSectionCount() const {
+        return (orientation == Qt::Horizontal
+                ? model->columnCount(root)
+                : model->rowCount(root));
+    }
+
+    inline bool modelIsEmpty() const {
+        return (model->rowCount(root) == 0 || model->columnCount(root) == 0);
+    }
+
+    inline void doDelayedResizeSections() {
+        if (!delayedResize.isActive())
+            delayedResize.start(0, q_func());
+    }
+
+    inline void executePostedResize() const {
+        if (delayedResize.isActive() && state == NoState) {
+            delayedResize.stop();
+            const_cast<QHeaderView*>(q_func())->resizeSections();
+        }
+    }
+
+    void clear();
+    void flipSortIndicator(int section);
+    void cascadingResize(int visual, int newSize);
+
+    enum State { NoState, ResizeSection, MoveSection, SelectSections, NoClear } state;
+
+    int offset;
+    Qt::Orientation orientation;
+    Qt::SortOrder sortIndicatorOrder;
+    int sortIndicatorSection;
+    bool sortIndicatorShown;
+
+    mutable QVector<int> visualIndices; // visualIndex = visualIndices.at(logicalIndex)
+    mutable QVector<int> logicalIndices; // logicalIndex = row or column in the model
+    mutable QBitArray sectionSelected; // from logical index to bit
+    mutable QBitArray sectionHidden; // from visual index to bit
+    mutable QHash<int, int> hiddenSectionSize; // from logical index to section size
+    mutable QHash<int, int> cascadingSectionSize; // from visual index to section size
+    mutable QSize cachedSizeHint;
+    mutable QBasicTimer delayedResize;
+
+    int firstCascadingSection;
+    int lastCascadingSection;
+
+    int lastPos;
+    int firstPos;
+    int originalSize;
+    int section; // used for resizing and moving sections
+    int target;
+    int pressed;
+    int hover;
+
+    int length;
+    int sectionCount;
+    bool movableSections;
+    bool clickableSections;
+    bool highlightSelected;
+    bool stretchLastSection;
+    bool cascadingResizing;
+    bool forceInitializing;
+    int stretchSections;
+    int contentsSections;
+    int defaultSectionSize;
+    int minimumSectionSize;
+    int lastSectionSize; // $$$
+    int sectionIndicatorOffset;
+    Qt::Alignment defaultAlignment;
+    QLabel *sectionIndicator;
+    QHeaderView::ResizeMode globalResizeMode;
+    QList<QPersistentModelIndex> persistentHiddenSections;
+
+    // header section spans
+
+    struct SectionSpan {
+        int size;
+        int count;
+        QHeaderView::ResizeMode resizeMode;
+        inline SectionSpan() : size(0), count(0), resizeMode(QHeaderView::Interactive) {}
+        inline SectionSpan(int length, int sections, QHeaderView::ResizeMode mode)
+            : size(length), count(sections), resizeMode(mode) {}
+        inline int sectionSize() const { return (count > 0 ? size / count : 0); }
+#ifndef QT_NO_DATASTREAM
+        inline void write(QDataStream &out) const
+        { out << size; out << count; out << (int)resizeMode; }
+        inline void read(QDataStream &in)
+        { in >> size; in >> count; int m; in >> m; resizeMode = (QHeaderView::ResizeMode)m; }
+#endif
+    };
+
+    QVector<SectionSpan> sectionSpans;
+
+    void createSectionSpan(int start, int end, int size, QHeaderView::ResizeMode mode);
+    void removeSectionsFromSpans(int start, int end);
+    void resizeSectionSpan(int visualIndex, int oldSize, int newSize);
+
+    inline int headerSectionCount() const { // for debugging
+        int count = 0;
+        for (int i = 0; i < sectionSpans.count(); ++i)
+            count += sectionSpans.at(i).count;
+        return count;
+    }
+
+    inline int headerLength() const { // for debugging
+        int len = 0;
+        for (int i = 0; i < sectionSpans.count(); ++i)
+            len += sectionSpans.at(i).size;
+        return len;
+    }
+
+    inline void removeSpans(const QList<int> &spans) {
+        for (int i = spans.count() - 1; i >= 0; --i) {
+            length -= sectionSpans.at(spans.at(i)).size;
+            sectionSpans.remove(spans.at(i));
+        }
+    }
+
+    inline int sectionSpanIndex(int visual) const {
+        int section_start = 0;
+        for (int i = 0; i < sectionSpans.count(); ++i) {
+            int section_end = section_start + sectionSpans.at(i).count - 1;
+            if (visual >= section_start && visual <= section_end)
+                return i;
+            section_start = section_end + 1;
+        }
+        return -1;
+    }
+
+    int headerSectionSize(int visual) const;
+    int headerSectionPosition(int visual) const;
+    int headerVisualIndexAt(int position) const;
+
+    // resize mode
+    void setHeaderSectionResizeMode(int visual, QHeaderView::ResizeMode mode);
+    QHeaderView::ResizeMode headerSectionResizeMode(int visual) const;
+    void setGlobalHeaderResizeMode(QHeaderView::ResizeMode mode);
+
+    // other
+    int viewSectionSizeHint(int logical) const;
+    int adjustedVisualIndex(int visualIndex) const;
+
+#ifndef QT_NO_DATASTREAM
+    void write(QDataStream &out) const;
+    bool read(QDataStream &in);
+#endif
+
+};
+
+QT_END_NAMESPACE
+
+#endif // QT_NO_ITEMVIEWS
+
+#endif // QHEADERVIEW_P_H