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Diffstat (limited to 'src/widgets/graphicsview/qgridlayoutengine_p.h')
| -rw-r--r-- | src/widgets/graphicsview/qgridlayoutengine_p.h | 458 |
1 files changed, 458 insertions, 0 deletions
diff --git a/src/widgets/graphicsview/qgridlayoutengine_p.h b/src/widgets/graphicsview/qgridlayoutengine_p.h new file mode 100644 index 0000000000..f947d67d5a --- /dev/null +++ b/src/widgets/graphicsview/qgridlayoutengine_p.h @@ -0,0 +1,458 @@ +/**************************************************************************** +** +** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies). +** All rights reserved. +** Contact: Nokia Corporation (qt-info@nokia.com) +** +** This file is part of the QtGui module of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** GNU Lesser General Public License Usage +** 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 1.1, 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. +** +** Other Usage +** Alternatively, this file may be used in accordance with the terms and +** conditions contained in a signed written agreement between you and Nokia. +** +** +** +** +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#ifndef QGRIDLAYOUTENGINE_P_H +#define QGRIDLAYOUTENGINE_P_H + +// +// W A R N I N G +// ------------- +// +// This file is not part of the Qt API. It exists for the convenience +// of the graphics view layout classes. This header +// file may change from version to version without notice, or even be removed. +// +// We mean it. +// + +#include "qalgorithms.h" +#include "qbitarray.h" +#include "qlist.h" +#include "qmap.h" +#include "qpair.h" +#include "qvector.h" +#include "qgraphicslayout_p.h" +#include <float.h> + +QT_BEGIN_NAMESPACE + +class QGraphicsLayoutItem; +class QStyle; +class QWidget; + +// ### deal with Descent in a similar way +enum { + MinimumSize = Qt::MinimumSize, + PreferredSize = Qt::PreferredSize, + MaximumSize = Qt::MaximumSize, + NSizes +}; + +// do not reorder +enum { + Hor, + Ver, + NOrientations +}; + +// do not reorder +enum LayoutSide { + Left, + Top, + Right, + Bottom +}; + +enum { + NoConstraint, + HorizontalConstraint, // Width depends on the height + VerticalConstraint, // Height depends on the width + UnknownConstraint, // need to update cache + UnfeasibleConstraint // not feasible, it be has some items with Vertical and others with Horizontal constraints +}; + +template <typename T> +class QLayoutParameter +{ +public: + enum State { Default, User, Cached }; + + inline QLayoutParameter() : q_value(T()), q_state(Default) {} + inline QLayoutParameter(T value, State state = Default) : q_value(value), q_state(state) {} + + inline void setUserValue(T value) { + q_value = value; + q_state = User; + } + inline void setCachedValue(T value) const { + if (q_state != User) { + q_value = value; + q_state = Cached; + } + } + inline T value() const { return q_value; } + inline T value(T defaultValue) const { return isUser() ? q_value : defaultValue; } + inline bool isDefault() const { return q_state == Default; } + inline bool isUser() const { return q_state == User; } + inline bool isCached() const { return q_state == Cached; } + +private: + mutable T q_value; + mutable State q_state; +}; + +class QStretchParameter : public QLayoutParameter<int> +{ +public: + QStretchParameter() : QLayoutParameter<int>(-1) {} + +}; + +class QGridLayoutBox +{ +public: + inline QGridLayoutBox() + : q_minimumSize(0), q_preferredSize(0), q_maximumSize(FLT_MAX), + q_minimumDescent(-1), q_minimumAscent(-1) {} + + void add(const QGridLayoutBox &other, int stretch, qreal spacing); + void combine(const QGridLayoutBox &other); + void normalize(); + +#ifdef QT_DEBUG + void dump(int indent = 0) const; +#endif + // This code could use the union-struct-array trick, but a compiler + // bug prevents this from working. + qreal q_minimumSize; + qreal q_preferredSize; + qreal q_maximumSize; + qreal q_minimumDescent; + qreal q_minimumAscent; + inline qreal &q_sizes(int which) + { + qreal *t; + switch (which) { + case Qt::MinimumSize: + t = &q_minimumSize; + break; + case Qt::PreferredSize: + t = &q_preferredSize; + break; + case Qt::MaximumSize: + t = &q_maximumSize; + break; + case Qt::MinimumDescent: + t = &q_minimumDescent; + break; + case (Qt::MinimumDescent + 1): + t = &q_minimumAscent; + break; + default: + t = 0; + break; + } + return *t; + } + inline const qreal &q_sizes(int which) const + { + const qreal *t; + switch (which) { + case Qt::MinimumSize: + t = &q_minimumSize; + break; + case Qt::PreferredSize: + t = &q_preferredSize; + break; + case Qt::MaximumSize: + t = &q_maximumSize; + break; + case Qt::MinimumDescent: + t = &q_minimumDescent; + break; + case (Qt::MinimumDescent + 1): + t = &q_minimumAscent; + break; + default: + t = 0; + break; + } + return *t; + } +}; + +bool operator==(const QGridLayoutBox &box1, const QGridLayoutBox &box2); +inline bool operator!=(const QGridLayoutBox &box1, const QGridLayoutBox &box2) + { return !operator==(box1, box2); } + +class QGridLayoutMultiCellData +{ +public: + inline QGridLayoutMultiCellData() : q_stretch(-1) {} + + QGridLayoutBox q_box; + int q_stretch; +}; + +typedef QMap<QPair<int, int>, QGridLayoutMultiCellData> MultiCellMap; + +class QGridLayoutRowInfo; + +class QGridLayoutRowData +{ +public: + void reset(int count); + void distributeMultiCells(const QGridLayoutRowInfo &rowInfo); + void calculateGeometries(int start, int end, qreal targetSize, qreal *positions, qreal *sizes, + qreal *descents, const QGridLayoutBox &totalBox, + const QGridLayoutRowInfo &rowInfo); + QGridLayoutBox totalBox(int start, int end) const; + void stealBox(int start, int end, int which, qreal *positions, qreal *sizes); + +#ifdef QT_DEBUG + void dump(int indent = 0) const; +#endif + + QBitArray ignore; // ### rename q_ + QVector<QGridLayoutBox> boxes; + MultiCellMap multiCellMap; + QVector<int> stretches; + QVector<qreal> spacings; + bool hasIgnoreFlag; +}; + +class QGridLayoutEngine; + +class QGridLayoutItem +{ +public: + QGridLayoutItem(QGridLayoutEngine *engine, QGraphicsLayoutItem *layoutItem, int row, int column, + int rowSpan = 1, int columnSpan = 1, Qt::Alignment alignment = 0, + int itemAtIndex = -1); + + inline int firstRow() const { return q_firstRows[Ver]; } + inline int firstColumn() const { return q_firstRows[Hor]; } + inline int rowSpan() const { return q_rowSpans[Ver]; } + inline int columnSpan() const { return q_rowSpans[Hor]; } + inline int lastRow() const { return firstRow() + rowSpan() - 1; } + inline int lastColumn() const { return firstColumn() + columnSpan() - 1; } + + int firstRow(Qt::Orientation orientation) const; + int firstColumn(Qt::Orientation orientation) const; + int lastRow(Qt::Orientation orientation) const; + int lastColumn(Qt::Orientation orientation) const; + int rowSpan(Qt::Orientation orientation) const; + int columnSpan(Qt::Orientation orientation) const; + void setFirstRow(int row, Qt::Orientation orientation = Qt::Vertical); + void setRowSpan(int rowSpan, Qt::Orientation orientation = Qt::Vertical); + + int stretchFactor(Qt::Orientation orientation) const; + void setStretchFactor(int stretch, Qt::Orientation orientation); + + inline Qt::Alignment alignment() const { return q_alignment; } + inline void setAlignment(Qt::Alignment alignment) { q_alignment = alignment; } + + QSizePolicy::Policy sizePolicy(Qt::Orientation orientation) const; + + bool hasDynamicConstraint() const; + Qt::Orientation dynamicConstraintOrientation() const; + + QSizePolicy::ControlTypes controlTypes(LayoutSide side) const; + QSizeF sizeHint(Qt::SizeHint which, const QSizeF &constraint = QSizeF()) const; + QGridLayoutBox box(Qt::Orientation orientation, qreal constraint = -1.0) const; + QRectF geometryWithin(qreal x, qreal y, qreal width, qreal height, qreal rowDescent) const; + + QGraphicsLayoutItem *layoutItem() const { return q_layoutItem; } + + void setGeometry(const QRectF &rect); + void transpose(); + void insertOrRemoveRows(int row, int delta, Qt::Orientation orientation = Qt::Vertical); + QSizeF effectiveMaxSize(const QSizeF &constraint) const; + +#ifdef QT_DEBUG + void dump(int indent = 0) const; +#endif + +private: + QGridLayoutEngine *q_engine; // ### needed? + QGraphicsLayoutItem *q_layoutItem; + int q_firstRows[NOrientations]; + int q_rowSpans[NOrientations]; + int q_stretches[NOrientations]; + Qt::Alignment q_alignment; +}; + +class QGridLayoutRowInfo +{ +public: + inline QGridLayoutRowInfo() : count(0) {} + + void insertOrRemoveRows(int row, int delta); + +#ifdef QT_DEBUG + void dump(int indent = 0) const; +#endif + + int count; + QVector<QStretchParameter> stretches; + QVector<QLayoutParameter<qreal> > spacings; + QVector<Qt::Alignment> alignments; + QVector<QGridLayoutBox> boxes; +}; + +class QGridLayoutEngine +{ +public: + QGridLayoutEngine(); + inline ~QGridLayoutEngine() { qDeleteAll(q_items); } + + int rowCount(Qt::Orientation orientation) const; + int columnCount(Qt::Orientation orientation) const; + inline int rowCount() const { return q_infos[Ver].count; } + inline int columnCount() const { return q_infos[Hor].count; } + // returns the number of items inserted, which may be less than (rowCount * columnCount) + int itemCount() const; + QGridLayoutItem *itemAt(int index) const; + int indexOf(QGraphicsLayoutItem *item) const; + + int effectiveFirstRow(Qt::Orientation orientation = Qt::Vertical) const; + int effectiveLastRow(Qt::Orientation orientation = Qt::Vertical) const; + + void setSpacing(qreal spacing, Qt::Orientations orientations); + qreal spacing(const QLayoutStyleInfo &styleInfo, Qt::Orientation orientation) const; + // ### setSpacingAfterRow(), spacingAfterRow() + void setRowSpacing(int row, qreal spacing, Qt::Orientation orientation = Qt::Vertical); + qreal rowSpacing(int row, Qt::Orientation orientation = Qt::Vertical) const; + + void setRowStretchFactor(int row, int stretch, Qt::Orientation orientation = Qt::Vertical); + int rowStretchFactor(int row, Qt::Orientation orientation = Qt::Vertical) const; + + void setStretchFactor(QGraphicsLayoutItem *layoutItem, int stretch, + Qt::Orientation orientation); + int stretchFactor(QGraphicsLayoutItem *layoutItem, Qt::Orientation orientation) const; + + void setRowSizeHint(Qt::SizeHint which, int row, qreal size, + Qt::Orientation orientation = Qt::Vertical); + qreal rowSizeHint(Qt::SizeHint which, int row, + Qt::Orientation orientation = Qt::Vertical) const; + + void setRowAlignment(int row, Qt::Alignment alignment, Qt::Orientation orientation); + Qt::Alignment rowAlignment(int row, Qt::Orientation orientation) const; + + void setAlignment(QGraphicsLayoutItem *layoutItem, Qt::Alignment alignment); + Qt::Alignment alignment(QGraphicsLayoutItem *layoutItem) const; + Qt::Alignment effectiveAlignment(const QGridLayoutItem *layoutItem) const; + + + void insertItem(QGridLayoutItem *item, int index); + void addItem(QGridLayoutItem *item); + void removeItem(QGridLayoutItem *item); + QGridLayoutItem *findLayoutItem(QGraphicsLayoutItem *layoutItem) const; + QGridLayoutItem *itemAt(int row, int column, Qt::Orientation orientation = Qt::Vertical) const; + inline void insertRow(int row, Qt::Orientation orientation = Qt::Vertical) + { insertOrRemoveRows(row, +1, orientation); } + inline void removeRows(int row, int count, Qt::Orientation orientation) + { insertOrRemoveRows(row, -count, orientation); } + + void invalidate(); + void setGeometries(const QLayoutStyleInfo &styleInfo, const QRectF &contentsGeometry); + QRectF cellRect(const QLayoutStyleInfo &styleInfo, const QRectF &contentsGeometry, int row, + int column, int rowSpan, int columnSpan) const; + QSizeF sizeHint(const QLayoutStyleInfo &styleInfo, Qt::SizeHint which, + const QSizeF &constraint) const; + + // heightForWidth / widthForHeight support + QSizeF dynamicallyConstrainedSizeHint(Qt::SizeHint which, const QSizeF &constraint) const; + bool ensureDynamicConstraint() const; + bool hasDynamicConstraint() const; + Qt::Orientation constraintOrientation() const; + + + QSizePolicy::ControlTypes controlTypes(LayoutSide side) const; + void transpose(); + void setVisualDirection(Qt::LayoutDirection direction); + Qt::LayoutDirection visualDirection() const; +#ifdef QT_DEBUG + void dump(int indent = 0) const; +#endif + +private: + static int grossRoundUp(int n) { return ((n + 2) | 0x3) - 2; } + + void maybeExpandGrid(int row, int column, Qt::Orientation orientation = Qt::Vertical); + void regenerateGrid(); + inline int internalGridRowCount() const { return grossRoundUp(rowCount()); } + inline int internalGridColumnCount() const { return grossRoundUp(columnCount()); } + void setItemAt(int row, int column, QGridLayoutItem *item); + void insertOrRemoveRows(int row, int delta, Qt::Orientation orientation = Qt::Vertical); + void fillRowData(QGridLayoutRowData *rowData, const QLayoutStyleInfo &styleInfo, + qreal *colPositions, qreal *colSizes, + Qt::Orientation orientation = Qt::Vertical) const; + void ensureEffectiveFirstAndLastRows() const; + void ensureColumnAndRowData(QGridLayoutRowData *rowData, QGridLayoutBox *totalBox, + const QLayoutStyleInfo &styleInfo, + qreal *colPositions, qreal *colSizes, + Qt::Orientation orientation) const; + + void ensureGeometries(const QLayoutStyleInfo &styleInfo, const QSizeF &size) const; + + // User input + QVector<QGridLayoutItem *> q_grid; + QList<QGridLayoutItem *> q_items; + QLayoutParameter<qreal> q_defaultSpacings[NOrientations]; + QGridLayoutRowInfo q_infos[NOrientations]; + Qt::LayoutDirection m_visualDirection; + + // Lazily computed from the above user input + mutable int q_cachedEffectiveFirstRows[NOrientations]; + mutable int q_cachedEffectiveLastRows[NOrientations]; + mutable quint8 q_cachedConstraintOrientation : 3; + + // Layout item input + mutable QLayoutStyleInfo q_cachedDataForStyleInfo; + mutable QGridLayoutRowData q_columnData; + mutable QGridLayoutRowData q_rowData; + mutable QGridLayoutBox q_totalBoxes[NOrientations]; + + // Output + mutable QSizeF q_cachedSize; + mutable QVector<qreal> q_xx; + mutable QVector<qreal> q_yy; + mutable QVector<qreal> q_widths; + mutable QVector<qreal> q_heights; + mutable QVector<qreal> q_descents; + + friend class QGridLayoutItem; +}; + +QT_END_NAMESPACE + +#endif |