q3header.cpp

奇趣公司比较新的qt/emd版本

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#include "q3header.h"
#ifndef QT_NO_HEADER
#include "qapplication.h"
#include "qbitarray.h"
#include "qcursor.h"
#include "qdrawutil.h"
#include "qevent.h"
#include "qpainter.h"
#include "qpixmap.h"
#include "qstyle.h"
#include "qstyleoption.h"
#include "qvector.h"

class Q3HeaderData
{
public:
    Q3HeaderData(int n)
    {
        count = n;
        sizes.resize(n);
        positions.resize(n);
        labels.resize(n);
        nullStringLabels.resize(n);
        icons.resize(n);
        i2s.resize(n);
        s2i.resize(n);
        clicks.resize(n);
        resize.resize(n);
        int p =0;
        for (int i = 0; i < n; i ++) {
            sizes[i] = 88;
            i2s[i] = i;
            s2i[i] = i;
            positions[i] = p;
            p += sizes[i];
        }
        clicks_default = true;
        resize_default = true;
        clicks.fill(clicks_default);
        resize.fill(resize_default);
        move = true;
        sortSection = -1;
        sortDirection = true;
        positionsDirty = true;
        lastPos = 0;
        fullSize = -2;
        pos_dirty = false;
        is_a_table_header = false;
        focusIdx = 0;
    }
    ~Q3HeaderData()
    {
        for (int i = 0; i < icons.size(); ++i)
            delete icons.at(i);
    }


    QVector<int>        sizes;
    int height; // we abuse the heights as widths for vertical layout
    bool heightDirty;
    QVector<int>        positions; // sorted by index
    QVector<QString>        labels;
    QVector<QIcon *> icons;
    QVector<int>                i2s;
    QVector<int>                s2i;

    QBitArray           clicks;
    QBitArray           resize;
    QBitArray           nullStringLabels;
    uint move : 1;
    uint clicks_default : 1; // default value for new clicks bits
    uint resize_default : 1; // default value for new resize bits
    uint pos_dirty : 1;
    uint is_a_table_header : 1;
    bool sortDirection;
    bool positionsDirty;
    int sortSection;
    int count;
    int lastPos;
    int fullSize;
    int focusIdx;
    int pressDelta;

    int sectionAt(int pos) {
        // positions is sorted by index, not by section
        if (!count)
            return -1;
        int l = 0;
        int r = count - 1;
        int i = ((l+r+1) / 2);
        while (r - l) {
            if (positions[i] > pos)
                r = i -1;
            else
                l = i;
            i = ((l+r+1) / 2);
        }
        if (positions[i] <= pos && pos <= positions[i] + sizes[i2s[i]])
            return i2s[i];
        return -1;
    }
};

static QStyleOptionHeader getStyleOption(const Q3Header *header, int section)
{
    QStyleOptionHeader opt;
    opt.init(header);
    opt.section = section;
    opt.textAlignment = Qt::AlignVCenter;
    opt.iconAlignment = Qt::AlignVCenter;
    if (header->iconSet(section))
        opt.icon = *header->iconSet(section);
    opt.text = header->label(section);
    if (header->orientation() == Qt::Horizontal)
        opt.state = QStyle::State_Horizontal;
    return opt;
}

bool qt_get_null_label_bit(Q3HeaderData *data, int section)
{
    return data->nullStringLabels.testBit(section);
}

void qt_set_null_label_bit(Q3HeaderData *data, int section, bool b)
{
    data->nullStringLabels.setBit(section, b);
}

/*!
    \class Q3Header q3header.h
    \brief The Q3Header class provides a header row or column, e.g. for
    tables and listviews.

    \compat

    This class provides a header, e.g. a vertical header to display
    row labels, or a horizontal header to display column labels. It is
    used by Q3Table and Q3ListView for example.

    A header is composed of one or more \e sections, each of which can
    display a text label and an \link QIcon icon\endlink. A sort
    indicator (an arrow) can also be displayed using
    setSortIndicator().

    Sections are added with addLabel() and removed with removeLabel().
    The label and icon are set in addLabel() and can be changed
    later with setLabel(). Use count() to retrieve the number of
    sections in the header.

    The orientation of the header is set with setOrientation(). If
    setStretchEnabled() is true, the sections will expand to take up
    the full width (height for vertical headers) of the header. The
    user can resize the sections manually if setResizeEnabled() is
    true. Call adjustHeaderSize() to have the sections resize to
    occupy the full width (or height).

    A section can be moved with moveSection(). If setMovingEnabled()
    is true (the default)the user may drag a section from one position
    to another. If a section is moved, the index positions at which
    sections were added (with addLabel()), may not be the same after the
    move. You don't have to worry about this in practice because the
    Q3Header API works in terms of section numbers, so it doesn't matter
    where a particular section has been moved to.

    If you want the current index position of a section call
    mapToIndex() giving it the section number. (This is the number
    returned by the addLabel() call which created the section.) If you
    want to get the section number of a section at a particular index
    position call mapToSection() giving it the index number.

    Here's an example to clarify mapToSection() and mapToIndex():

    \table
    \header \i41 Index positions
    \row \i 0 \i 1 \i 2 \i 3
    \header \i41 Original section ordering
    \row \i Sect 0 \i Sect 1 \i Sect 2 \i Sect 3
    \header \i41 Ordering after the user moves a section
    \row \i Sect 0 \i Sect 2 \i Sect 3 \i Sect 1
    \endtable

    \table
    \header \i \e k \i mapToSection(\e k) \i mapToIndex(\e k)
    \row \i 0 \i 0 \i 0
    \row \i 1 \i 2 \i 3
    \row \i 2 \i 3 \i 1
    \row \i 3 \i 1 \i 2
    \endtable

    In the example above, if we wanted to find out which section is at
    index position 3 we'd call mapToSection(3) and get a section
    number of 1 since section 1 was moved. Similarly, if we wanted to
    know which index position section 2 occupied we'd call
    mapToIndex(2) and get an index of 1.

    Q3Header provides the clicked(), pressed() and released() signals.
    If the user changes the size of a section, the sizeChange() signal
    is emitted. If you want to have a sizeChange() signal emitted
    continuously whilst the user is resizing (rather than just after
    the resizing is finished), use setTracking(). If the user moves a
    section the indexChange() signal is emitted.

    \sa Q3ListView Q3Table
*/



/*!
    Constructs a horizontal header called \a name, with parent \a
    parent.
*/

Q3Header::Q3Header(QWidget *parent, const char *name)
    : QWidget(parent, name, Qt::WStaticContents)
{
    orient = Qt::Horizontal;
    init(0);
}

/*!
    Constructs a horizontal header called \a name, with \a n sections
    and parent \a parent.
*/

Q3Header::Q3Header(int n, QWidget *parent, const char *name)
    : QWidget(parent, name, Qt::WStaticContents)
{
    orient = Qt::Horizontal;
    init(n);
}

/*!
    Destroys the header and all its sections.
*/

Q3Header::~Q3Header()
{
    delete d;
    d = 0;
}

/*! \reimp
 */

void Q3Header::showEvent(QShowEvent *e)
{
    calculatePositions();
    QWidget::showEvent(e);
}

/*!
    \fn void Q3Header::sizeChange(int section, int oldSize, int newSize)

    This signal is emitted when the user has changed the size of a \a
    section from \a oldSize to \a newSize. This signal is typically
    connected to a slot that repaints the table or list that contains
    the header.
*/

/*!
    \fn void Q3Header::clicked(int section)

    If isClickEnabled() is true, this signal is emitted when the user
    clicks section \a section.

    \sa pressed(), released()
*/

/*!
    \fn void Q3Header::pressed(int section)

    This signal is emitted when the user presses section \a section
    down.

    \sa released()
*/

/*!
    \fn void Q3Header::released(int section)

    This signal is emitted when section \a section is released.

    \sa pressed()
*/


/*!
    \fn void Q3Header::indexChange(int section, int fromIndex, int toIndex)

    This signal is emitted when the user moves section \a section from
    index position \a fromIndex, to index position \a toIndex.
*/

/*!
  \fn void Q3Header::moved(int fromIndex, int toIndex)

  Use indexChange() instead.

  This signal is emitted when the user has moved the section which
  is displayed at the index \a fromIndex to the index \a toIndex.
*/

/*!
  \fn void Q3Header::sectionClicked(int index)

  Use clicked() instead.

  This signal is emitted when a part of the header is clicked. \a
  index is the index at which the section is displayed.

  In a list view this signal would typically be connected to a slot
  that sorts the specified column (or row).
*/

/*! \fn int Q3Header::cellSize(int) const

  Use sectionSize() instead.

  Returns the size in pixels of the section that is displayed at
  the index \a i.
*/

/*!
    \fn void Q3Header::sectionHandleDoubleClicked(int section)

    This signal is emitted when the user doubleclicks on the edge
    (handle) of section \a section.
*/

/*!

  Use sectionPos() instead.

  Returns the position in pixels of the section that is displayed at the
  index \a i. The  position is measured from the start of the header.
*/

int Q3Header::cellPos(int i) const
{
    if (i == count() && i > 0)
        return  d->positions[i-1] + d->sizes[d->i2s[i-1]]; // compatibility
    return sectionPos(mapToSection(i));
}


/*!
    \property Q3Header::count
    \brief the number of sections in the header
*/

int Q3Header::count() const
{
    return d->count;
}


/*!
    \property Q3Header::tracking
    \brief whether the sizeChange() signal is emitted continuously

    If tracking is on, the sizeChange() signal is emitted continuously
    while the mouse is moved (i.e. when the header is resized),
    otherwise it is only emitted when the mouse button is released at
    the end of resizing.

    Tracking defaults to false.
*/


/*
    Initializes with \a n columns.
*/
void Q3Header::init(int n)
{
    state = Idle;
    cachedPos = 0; // unused
    d = new Q3HeaderData(n);
    d->height = 0;
    d->heightDirty = true;
    offs = 0;
    if(reverse())
        offs = d->lastPos - width();
    oldHandleIdx = oldHIdxSize = handleIdx = 0;

    setMouseTracking(true);
    trackingIsOn = false;
    setBackgroundRole(QPalette::Button);
    setSizePolicy(QSizePolicy(QSizePolicy::Preferred, QSizePolicy::Fixed));
    setAttribute(Qt::WA_PaintOutsidePaintEvent);
}

/*!
    \property Q3Header::orientation
    \brief the header's orientation

    The orientation is either Qt::Vertical or Qt::Horizontal (the
    default).

    Call setOrientation() before adding labels if you don't provide a
    size parameter otherwise the sizes will be incorrect.
*/

void Q3Header::setOrientation(Qt::Orientation orientation)
{
    if (orient == orientation)
        return;
    orient = orientation;
    if (orient == Qt::Horizontal)
        setSizePolicy(QSizePolicy(QSizePolicy::Preferred, QSizePolicy::Fixed));
    else
        setSizePolicy(QSizePolicy(QSizePolicy::Fixed, QSizePolicy::Preferred));
    update();
    updateGeometry();
}


/*
    Paints a rectangle starting at \a p, with length \s.
*/
void Q3Header::paintRect(int p, int s)
{
    QPainter paint(this);
    paint.setPen(QPen(Qt::black, 1, Qt::DotLine));
    if (reverse())
        paint.drawRect(p - s, 3, s, height() - 5);
    else if (orient == Qt::Horizontal)
        paint.drawRect(p, 3, s, height() - 5);
    else
        paint.drawRect(3, p, height() - 5, s);
}

/*
  Marks the division line at \a idx.
*/
void Q3Header::markLine(int idx)
{
    QPainter paint(this);
    paint.setPen(QPen(Qt::black, 1, Qt::DotLine));
    int MARKSIZE = style()->pixelMetric(QStyle::PM_HeaderMarkSize);
    int p = pPos(idx);
    int x = p - MARKSIZE/2;
    int y = 2;
    int x2 = p + MARKSIZE/2;
    int y2 = height() - 3;
    if (orient == Qt::Vertical) {
        int t = x; x = y; y = t;
        t = x2; x2 = y2; y2 = t;
    }

    paint.drawLine(x, y, x2, y);
    paint.drawLine(x, y+1, x2, y+1);

    paint.drawLine(x, y2, x2, y2);
    paint.drawLine(x, y2-1, x2, y2-1);

    paint.drawLine(x, y, x, y2);
    paint.drawLine(x+1, y, x+1, y2);

    paint.drawLine(x2, y, x2, y2);
    paint.drawLine(x2-1, y, x2-1, y2);
}

/*
  Removes the mark at the division line at \a idx.
*/
void Q3Header::unMarkLine(int idx)
{
    if (idx < 0)
        return;
    int MARKSIZE = style()->pixelMetric(QStyle::PM_HeaderMarkSize);
    int p = pPos(idx);
    int x = p - MARKSIZE/2;
    int y = 2;
    int x2 = p + MARKSIZE/2;