source: trunk/src/gui/kernel/qdnd_qws.cpp@ 626

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#include "qapplication.h"

#ifndef QT_NO_DRAGANDDROP

#include "qwidget.h"
#include "qdatetime.h"
#include "qbitmap.h"
#include "qcursor.h"
#include "qevent.h"
#include "qpainter.h"
#include "qdnd_p.h"

QT_BEGIN_NAMESPACE

QT_USE_NAMESPACE

static QPixmap *defaultPm = 0;
static const int default_pm_hotx = -2;
static const int default_pm_hoty = -16;
static const char *const default_pm[] = {
"13 9 3 1",
".      c None",
"       c #000000",
"X      c #FFFFFF",
"X X X X X X X",
" X X X X X X ",
"X ......... X",
" X.........X ",
"X ......... X",
" X.........X ",
"X ......... X",
" X X X X X X ",
"X X X X X X X",
};

// Shift/Ctrl handling, and final drop status
static Qt::DropAction global_accepted_action = Qt::CopyAction;
static Qt::DropActions possible_actions = Qt::IgnoreAction;


// static variables in place of a proper cross-process solution
static QDrag *drag_object;
static bool qt_qws_dnd_dragging = false;


static Qt::KeyboardModifiers oldstate;

class QShapedPixmapWidget : public QWidget {
    QPixmap pixmap;
public:
    QShapedPixmapWidget() :
        QWidget(0, Qt::Tool | Qt::FramelessWindowHint | Qt::X11BypassWindowManagerHint)
    {
        // ### Temporary workaround for 4.2-rc1!!! To prevent flickering when
        // using drag'n drop in a client application. (task 126956)
        // setAttribute() should be done unconditionally!
        if (QApplication::type() == QApplication::GuiServer)
            setAttribute(Qt::WA_TransparentForMouseEvents);
    }

    void setPixmap(QPixmap pm)
    {
        pixmap = pm;
        if (!pixmap.mask().isNull()) {
            setMask(pixmap.mask());
        } else {
            clearMask();
        }
        resize(pm.width(),pm.height());
    }

    void paintEvent(QPaintEvent*)
    {
        QPainter p(this);
        p.drawPixmap(0,0,pixmap);
    }
};


static QShapedPixmapWidget *qt_qws_dnd_deco = 0;


void QDragManager::updatePixmap()
{
    if (qt_qws_dnd_deco) {
        QPixmap pm;
        QPoint pm_hot(default_pm_hotx,default_pm_hoty);
        if (drag_object) {
            pm = drag_object->pixmap();
            if (!pm.isNull())
                pm_hot = drag_object->hotSpot();
        }
        if (pm.isNull()) {
            if (!defaultPm)
                defaultPm = new QPixmap(default_pm);
            pm = *defaultPm;
        }
        qt_qws_dnd_deco->setPixmap(pm);
        qt_qws_dnd_deco->move(QCursor::pos()-pm_hot);
        if (willDrop) {
            qt_qws_dnd_deco->show();
        } else {
            qt_qws_dnd_deco->hide();
        }
    }
}

void QDragManager::timerEvent(QTimerEvent *) { }

void QDragManager::move(const QPoint &) { }

void QDragManager::updateCursor()
{
#ifndef QT_NO_CURSOR
    if (willDrop) {
        if (qt_qws_dnd_deco)
            qt_qws_dnd_deco->show();
        if (currentActionForOverrideCursor != global_accepted_action) {
            QApplication::changeOverrideCursor(QCursor(dragCursor(global_accepted_action), 0, 0));
            currentActionForOverrideCursor = global_accepted_action;
        }
    } else {
        QCursor *overrideCursor = QApplication::overrideCursor();