q3listbox.cpp

奇趣公司比较新的qt/emd版本

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#include "qglobal.h"
#if defined(Q_CC_BOR)
// needed for qsort() because of a std namespace problem on Borland
#include "qplatformdefs.h"
#endif

#include "q3listbox.h"
#ifndef QT_NO_LISTBOX
#include "qapplication.h"
#include "qevent.h"
#include "qfontmetrics.h"
#include "qpainter.h"
#include "qpixmap.h"
#include "qstringlist.h"
#include "qstyle.h"
#include "qstyleoption.h"
#include "qtimer.h"
#include "qvector.h"
#include "qpointer.h"
#ifndef QT_NO_ACCESSIBILITY
#include "qaccessible.h"
#endif

#include <stdlib.h>

class Q3ListBoxPrivate
{
public:
    Q3ListBoxPrivate(Q3ListBox *lb):
        head(0), last(0), cache(0), cacheIndex(-1), current(0),
        highlighted(0), tmpCurrent(0), columnPos(1), rowPos(1), rowPosCache(0),
        columnPosOne(0), rowMode(Q3ListBox::FixedNumber),
        columnMode(Q3ListBox::FixedNumber), numRows(1), numColumns(1),
        currentRow(0), currentColumn(0),
        mousePressRow(-1), mousePressColumn(-1),
        mouseMoveRow(-1), mouseMoveColumn(-1), mouseInternalPress(false),
        scrollTimer(0), updateTimer(0), visibleTimer(0),
        selectionMode(Q3ListBox::Single),
        count(0),
        listBox(lb), currInputString(QString()),
        rowModeWins(false),
        ignoreMoves(false),
        layoutDirty(true),
        mustPaintAll(true),
        dragging(false),
        dirtyDrag (false),
        variableHeight(true /* !!! ### false */),
        variableWidth(false),
        inMenuMode(false)
    {}
    int findItemByName(int item, const QString &text);
    ~Q3ListBoxPrivate();

    Q3ListBoxItem * head, *last, *cache;
    int cacheIndex;
    Q3ListBoxItem * current, *highlighted, *tmpCurrent;

    QVector<int> columnPos;
    QVector<int> rowPos;
    int rowPosCache;
    int columnPosOne;

    Q3ListBox::LayoutMode rowMode;
    Q3ListBox::LayoutMode columnMode;
    int numRows;
    int numColumns;

    int currentRow;
    int currentColumn;
    int mousePressRow;
    int mousePressColumn;
    int mouseMoveRow;
    int mouseMoveColumn;
    bool mouseInternalPress;

    QTimer * scrollTimer;
    QTimer * updateTimer;
    QTimer * visibleTimer;
    QTimer * resizeTimer;

    QPoint scrollPos;

    Q3ListBox::SelectionMode selectionMode;

    int count;


    Q3ListBox *listBox;
    QString currInputString;
    QTimer *inputTimer;

    Q3ListBoxItem *pressedItem, *selectAnchor;

    uint select :1;
    uint pressedSelected :1;
    uint rowModeWins :1;
    uint ignoreMoves :1;
    uint clearing :1;
    uint layoutDirty :1;
    uint mustPaintAll :1;
    uint dragging :1;
    uint dirtyDrag :1;
    uint variableHeight :1;
    uint variableWidth :1;
    uint inMenuMode :1;

    QRect *rubber;

    struct SortableItem {
        Q3ListBoxItem *item;
    };
};


Q3ListBoxPrivate::~Q3ListBoxPrivate()
{
    Q_ASSERT(!head);
}


/*!
    \class Q3ListBoxItem qlistbox.h
    \brief The Q3ListBoxItem class is the base class of all list box items.

    \compat

    This class is an abstract base class used for all list box items.
    If you need to insert customized items into a Q3ListBox you must
    inherit this class and reimplement paint(), height() and width().

    \sa Q3ListBox
*/

/*!
    Constructs an empty list box item in the list box \a listbox.
*/

Q3ListBoxItem::Q3ListBoxItem(Q3ListBox* listbox)
{
    lbox = listbox;
    s = false;
    dirty = true;
    custom_highlight = false;
    selectable = true;
    p = n = 0;

    if (listbox)
        listbox->insertItem(this);
}

/*!
    Constructs an empty list box item in the list box \a listbox and
    inserts it after the item \a after or at the beginning if \a after
    is 0.
*/

Q3ListBoxItem::Q3ListBoxItem(Q3ListBox* listbox, Q3ListBoxItem *after)
{
    lbox = listbox;
    s = false;
    dirty = true;
    custom_highlight = false;
    selectable = true;
    p = n = 0;

    if (listbox)
        listbox->insertItem(this, after);
}


/*!
    Destroys the list box item.
*/

Q3ListBoxItem::~Q3ListBoxItem()
{
    if (lbox)
        lbox->takeItem(this);
}


/*!
    Defines whether the list box item is responsible for drawing
    itself in a highlighted state when being selected.

    If \a b is false (the default), the list box will draw some
    default highlight indicator before calling paint().

    \sa isSelected(), paint()
*/
void Q3ListBoxItem::setCustomHighlighting(bool b)
{
    custom_highlight = b;
}

/*!
    \fn void Q3ListBoxItem::paint(QPainter *p)

    Implement this function to draw your item. The painter, \a p, is
    already open for painting.

    \sa height(), width()
*/

/*!
    \fn int Q3ListBoxItem::width(const Q3ListBox* lb) const

    Reimplement this function to return the width of your item. The \a
    lb parameter is the same as listBox() and is provided for
    convenience and compatibility.

    The default implementation returns
    \l{QApplication::globalStrut()}'s width.

    \sa paint(), height()
*/
int Q3ListBoxItem::width(const Q3ListBox*)  const
{
    return QApplication::globalStrut().width();
}

/*!
    \fn int Q3ListBoxItem::height(const Q3ListBox* lb) const

    Implement this function to return the height of your item. The \a
    lb parameter is the same as listBox() and is provided for
    convenience and compatibility.

    The default implementation returns
    \l{QApplication::globalStrut()}'s height.

    \sa paint(), width()
*/
int Q3ListBoxItem::height(const Q3ListBox*)  const
{
    return QApplication::globalStrut().height();
}


/*!
    Returns the text of the item. This text is also used for sorting.

    \sa setText()
*/
QString Q3ListBoxItem::text() const
{
    return txt;
}

/*!
    Returns the pixmap associated with the item, or 0 if there isn't
    one.

    The default implementation returns 0.
*/
const QPixmap *Q3ListBoxItem::pixmap() const
{
    return 0;
}

/*! \fn void Q3ListBoxItem::setSelectable(bool b)

    If \a b is true (the default) then this item can be selected by
    the user; otherwise this item cannot be selected by the user.

    \sa isSelectable()
*/

/*! \fn bool Q3ListBoxItem::isSelectable() const

    Returns true if this item is selectable (the default); otherwise
    returns false.

    \sa setSelectable()
*/


/*!
    \fn void Q3ListBoxItem::setText(const QString &text)

    Sets the text of the Q3ListBoxItem to \a text. This \a text is also
    used for sorting. The text is not shown unless explicitly drawn in
    paint().

    \sa text()
*/


/*!
    \class Q3ListBoxText qlistbox.h
    \brief The Q3ListBoxText class provides list box items that display text.

    \compat

    The text is drawn in the widget's current font. If you need
    several different fonts, you must implement your own subclass of
    Q3ListBoxItem.

    \sa Q3ListBox, Q3ListBoxItem
*/


/*!
    Constructs a list box item in list box \a listbox showing the text
    \a text.
*/
Q3ListBoxText::Q3ListBoxText(Q3ListBox *listbox, const QString &text)
    :Q3ListBoxItem(listbox)
{
    setText(text);
}

/*!
    Constructs a list box item showing the text \a text.
*/

Q3ListBoxText::Q3ListBoxText(const QString &text)
    :Q3ListBoxItem()
{
    setText(text);
}

/*!
    Constructs a list box item in list box \a listbox showing the text
    \a text. The item is inserted after the item \a after, or at the
    beginning if \a after is 0.
*/

Q3ListBoxText::Q3ListBoxText(Q3ListBox* listbox, const QString &text, Q3ListBoxItem *after)
    : Q3ListBoxItem(listbox, after)
{
    setText(text);
}

/*!
    Destroys the item.
*/

Q3ListBoxText::~Q3ListBoxText()
{
}

/*!
    Draws the text using \a painter.
*/

void Q3ListBoxText::paint(QPainter *painter)
{
    int itemHeight = height(listBox());
    QFontMetrics fm = painter->fontMetrics();
    int yPos = ((itemHeight - fm.height()) / 2) + fm.ascent();
    painter->drawText(3, yPos, text());
}

/*!
    Returns the height of a line of text in list box \a lb.

    \sa paint(), width()
*/

int Q3ListBoxText::height(const Q3ListBox* lb) const
{
    int h = lb ? lb->fontMetrics().lineSpacing() + 2 : 0;
    return qMax(h, QApplication::globalStrut().height());
}

/*!
    Returns the width of this line in list box \a lb.

    \sa paint(), height()
*/

int Q3ListBoxText::width(const Q3ListBox* lb) const
{
    int w = lb ? lb->fontMetrics().width(text()) + 6 : 0;
    return qMax(w, QApplication::globalStrut().width());
}

/*!
    \fn int Q3ListBoxText::rtti() const

    \reimp

    Returns 1.

    Make your derived classes return their own values for rtti(), and
    you can distinguish between listbox items. You should use values
    greater than 1000 preferably a large random number, to allow for
    extensions to this class.
*/

int Q3ListBoxText::rtti() const
{
    return RTTI;
}

/*!
    \class Q3ListBoxPixmap qlistbox.h
    \brief The Q3ListBoxPixmap class provides list box items with a
    pixmap and optional text.

    \compat

    Items of this class are drawn with the pixmap on the left with the
    optional text to the right of the pixmap.

    \sa Q3ListBox, Q3ListBoxItem
*/


/*!
    Constructs a new list box item in list box \a listbox showing the
    pixmap \a pixmap.
*/

Q3ListBoxPixmap::Q3ListBoxPixmap(Q3ListBox* listbox, const QPixmap &pixmap)
    : Q3ListBoxItem(listbox)
{
    pm = pixmap;
}

/*!
    Constructs a new list box item showing the pixmap \a pixmap.
*/

Q3ListBoxPixmap::Q3ListBoxPixmap(const QPixmap &pixmap)
    : Q3ListBoxItem()
{
    pm = pixmap;
}

/*!
    Constructs a new list box item in list box \a listbox showing the