QT_ENSURE_STACK_ALIGNED_FOR_SSE STDMETHODIMP
QWindowsOleDropSource::GiveFeedback(DWORD dwEffect)
{
const Qt::DropAction action = translateToQDragDropAction(dwEffect);
m_drag->updateAction(action);
const qint64 currentCacheKey = m_drag->currentDrag()->dragCursor(action).cacheKey();
auto it = m_cursors.constFind(action);
// If a custom drag cursor is set, check its cache key to detect changes.
if (it == m_cursors.constEnd() || (currentCacheKey && currentCacheKey != it.value().cacheKey)) {
createCursors();
it = m_cursors.constFind(action);
}
if (it != m_cursors.constEnd()) {
const CursorEntry &e = it.value();
switch (m_mode) {
case MouseDrag:
SetCursor(e.cursor->handle());
break;
case TouchDrag:
if (!m_touchDragWindow)
m_touchDragWindow = new QWindowsDragCursorWindow;
m_touchDragWindow->setPixmap(e.pixmap);
m_touchDragWindow->setFramePosition(QCursor::pos() - e.hotSpot);
if (!m_touchDragWindow->isVisible())
m_touchDragWindow->show();
break;
}
return ResultFromScode(S_OK);
}
return ResultFromScode(DRAGDROP_S_USEDEFAULTCURSORS);
}
void QWindowsOleDropSource::clearCursors()
{
if (!m_cursors.isEmpty()) {
const ActionCursorMap::const_iterator cend = m_cursors.constEnd();
for (ActionCursorMap::const_iterator it = m_cursors.constBegin(); it != cend; ++it)
DestroyCursor(it.value());
m_cursors.clear();
}
}
void QWindowsOleDropSource::createCursors()
{
const QDrag *drag = m_drag->currentDrag();
const QPixmap pixmap = drag->pixmap();
const bool hasPixmap = !pixmap.isNull();
QList<Qt::DropAction> actions;
actions << Qt::MoveAction << Qt::CopyAction << Qt::LinkAction;
if (hasPixmap)
actions << Qt::IgnoreAction;
const QPoint hotSpot = drag->hotSpot();
for (int cnum = 0; cnum < actions.size(); ++cnum) {
const Qt::DropAction action = actions.at(cnum);
QPixmap cpm = drag->dragCursor(action);
if (cpm.isNull())
cpm = m_drag->defaultCursor(action);
if (cpm.isNull()) {
qWarning("%s: Unable to obtain drag cursor for %d.", __FUNCTION__, action);
continue;
}
int w = cpm.width();
int h = cpm.height();
if (hasPixmap) {
const int x1 = qMin(-hotSpot.x(), 0);
const int x2 = qMax(pixmap.width() - hotSpot.x(), cpm.width());
const int y1 = qMin(-hotSpot.y(), 0);
const int y2 = qMax(pixmap.height() - hotSpot.y(), cpm.height());
w = x2 - x1 + 1;
h = y2 - y1 + 1;
}
const QPoint newHotSpot = hotSpot;
QPixmap newCursor(w, h);
if (hasPixmap) {
newCursor.fill(Qt::transparent);
QPainter p(&newCursor);
const QRect srcRect = pixmap.rect();
const QPoint pmDest = QPoint(qMax(0, -hotSpot.x()), qMax(0, -hotSpot.y()));
p.drawPixmap(pmDest, pixmap, srcRect);
p.drawPixmap(qMax(0,newHotSpot.x()),qMax(0,newHotSpot.y()),cpm);
} else {
newCursor = cpm;
}
const int hotX = hasPixmap ? qMax(0,newHotSpot.x()) : 0;
const int hotY = hasPixmap ? qMax(0,newHotSpot.y()) : 0;
if (const HCURSOR sysCursor = QWindowsCursor::createPixmapCursor(newCursor, hotX, hotY))
m_cursors.insert(actions.at(cnum), sysCursor);
}
if (QWindowsContext::verboseOLE)
qDebug("%s %d cursors", __FUNCTION__, m_cursors.size());
}
void QWindowsOleDropSource::createCursors()
{
const QDrag *drag = m_drag->currentDrag();
const QPixmap pixmap = drag->pixmap();
const bool hasPixmap = !pixmap.isNull();
// Find screen for drag. Could be obtained from QDrag::source(), but that might be a QWidget.
const QPlatformScreen *platformScreen = QWindowsContext::instance()->screenManager().screenAtDp(QWindowsCursor::mousePosition());
if (!platformScreen) {
if (const QScreen *primaryScreen = QGuiApplication::primaryScreen())
platformScreen = primaryScreen->handle();
}
Q_ASSERT(platformScreen);
QPlatformCursor *platformCursor = platformScreen->cursor();
qreal pixmapScaleFactor = 1;
qreal hotSpotScaleFactor = 1;
if (m_mode != TouchDrag) { // Touch drag: pixmap is shown in a separate QWindow, which will be scaled.)
hotSpotScaleFactor = QHighDpiScaling::factor(platformScreen);
pixmapScaleFactor = hotSpotScaleFactor / pixmap.devicePixelRatio();
}
QPixmap scaledPixmap = qFuzzyCompare(pixmapScaleFactor, 1.0)
? pixmap
: pixmap.scaled((QSizeF(pixmap.size()) * pixmapScaleFactor).toSize(),
Qt::KeepAspectRatio, Qt::SmoothTransformation);
scaledPixmap.setDevicePixelRatio(1);
Qt::DropAction actions[] = { Qt::MoveAction, Qt::CopyAction, Qt::LinkAction, Qt::IgnoreAction };
int actionCount = int(sizeof(actions) / sizeof(actions[0]));
if (!hasPixmap)
--actionCount; // No Qt::IgnoreAction unless pixmap
const QPoint hotSpot = qFuzzyCompare(hotSpotScaleFactor, 1.0)
? drag->hotSpot()
: (QPointF(drag->hotSpot()) * hotSpotScaleFactor).toPoint();
for (int cnum = 0; cnum < actionCount; ++cnum) {
const Qt::DropAction action = actions[cnum];
QPixmap cursorPixmap = drag->dragCursor(action);
if (cursorPixmap.isNull() && platformCursor)
cursorPixmap = static_cast<QWindowsCursor *>(platformCursor)->dragDefaultCursor(action);
const qint64 cacheKey = cursorPixmap.cacheKey();
const auto it = m_cursors.find(action);
if (it != m_cursors.end() && it.value().cacheKey == cacheKey)
continue;
if (cursorPixmap.isNull()) {
qWarning("%s: Unable to obtain drag cursor for %d.", __FUNCTION__, action);
continue;
}
QPoint newHotSpot(0, 0);
QPixmap newPixmap = cursorPixmap;
if (hasPixmap) {
const int x1 = qMin(-hotSpot.x(), 0);
const int x2 = qMax(scaledPixmap.width() - hotSpot.x(), cursorPixmap.width());
const int y1 = qMin(-hotSpot.y(), 0);
const int y2 = qMax(scaledPixmap.height() - hotSpot.y(), cursorPixmap.height());
QPixmap newCursor(x2 - x1 + 1, y2 - y1 + 1);
newCursor.fill(Qt::transparent);
QPainter p(&newCursor);
const QPoint pmDest = QPoint(qMax(0, -hotSpot.x()), qMax(0, -hotSpot.y()));
p.drawPixmap(pmDest, scaledPixmap);
p.drawPixmap(qMax(0, hotSpot.x()),qMax(0, hotSpot.y()), cursorPixmap);
newPixmap = newCursor;
newHotSpot = QPoint(qMax(0, hotSpot.x()), qMax(0, hotSpot.y()));
}
if (const HCURSOR sysCursor = QWindowsCursor::createPixmapCursor(newPixmap, newHotSpot)) {
const CursorEntry entry(newPixmap, cacheKey, CursorHandlePtr(new CursorHandle(sysCursor)), newHotSpot);
if (it == m_cursors.end())
m_cursors.insert(action, entry);
else
it.value() = entry;
}
}
#ifndef QT_NO_DEBUG_OUTPUT
if (lcQpaMime().isDebugEnabled())
qCDebug(lcQpaMime) << __FUNCTION__ << "pixmap" << pixmap.size() << m_cursors.size() << "cursors:\n" << m_cursors;
#endif // !QT_NO_DEBUG_OUTPUT
}
