q3listbox.cpp

奇趣公司比较新的qt/emd版本

                    setSelected(i, !i->isSelected());
                    shouldBlock = true;
                    d->pressedSelected = false;
                }
                bool blocked = signalsBlocked();
                blockSignals(shouldBlock);
                setCurrentItem(i);
                blockSignals(blocked);
            }
            break;
        case Multi:
	    {
                setSelected(i, !i->s);
                bool b = signalsBlocked();
                blockSignals(true);
                setCurrentItem(i);
                blockSignals(b);
                break;
	    }
        case NoSelection:
            setCurrentItem(i);
            break;
        }
    } else {
        bool unselect = true;
        if (e->button() == Qt::LeftButton) {
            if (d->selectionMode == Multi ||
                 d->selectionMode == Extended) {
                d->tmpCurrent = d->current;
                d->current = 0;
                updateItem(d->tmpCurrent);
                if (d->rubber)
                    delete d->rubber;
                d->rubber = 0;
                d->rubber = new QRect(e->x(), e->y(), 0, 0);

                if (d->selectionMode == Extended && !(e->state() & Qt::ControlButton))
                    selectAll(false);
                unselect = false;
            }
            if (unselect && (e->button() == Qt::RightButton ||
                               (selectionMode() == Multi || selectionMode() == Extended)))
                clearSelection();
        }
    }

    // for sanity, in case people are event-filtering or whatnot
    delete d->scrollTimer;
    d->scrollTimer = 0;
    if (i) {
        d->mousePressColumn = d->currentColumn;
        d->mousePressRow = d->currentRow;
    } else {
        d->mousePressColumn = -1;
        d->mousePressRow = -1;
    }
    d->ignoreMoves = false;

    d->pressedItem = i;

    emit pressed(i);
    emit pressed(i, e->globalPos());
    emit mouseButtonPressed(e->button(), i, e->globalPos());
    if (e->button() == Qt::RightButton)
        emit rightButtonPressed(i, e->globalPos());
}


/*! \reimp */

void Q3ListBox::mouseReleaseEvent(QMouseEvent *e)
{
    if (d->selectionMode == Extended &&
        d->dragging) {
        d->dragging = false;
        if (d->current != d->pressedItem) {
            updateSelection(); // when we drag, we get an update after we release
        }
    }

    if (d->rubber) {
        drawRubber();
        delete d->rubber;
        d->rubber = 0;
        d->current = d->tmpCurrent;
        updateItem(d->current);
    }
    if (d->scrollTimer)
        mouseMoveEvent(e);
    delete d->scrollTimer;
    d->scrollTimer = 0;
    d->ignoreMoves = false;

    if (d->selectionMode == Extended &&
         d->current == d->pressedItem &&
         d->pressedSelected && d->current) {
        bool block = signalsBlocked();
        blockSignals(true);
        clearSelection();
        blockSignals(block);
        d->current->s = true;
        emit selectionChanged();
    }

    Q3ListBoxItem * i = itemAt(e->pos());
    bool emitClicked = d->mousePressColumn != -1 && d->mousePressRow != -1 || !d->pressedItem;
    emitClicked = emitClicked && d->pressedItem == i;
    d->pressedItem = 0;
    d->mousePressRow = -1;
    d->mousePressColumn = -1;
    d->mouseInternalPress = false;
    if (emitClicked) {
        emit clicked(i);
        emit clicked(i, e->globalPos());
        emit mouseButtonClicked(e->button(), i, e->globalPos());
        if (e->button() == Qt::RightButton)
            emit rightButtonClicked(i, e->globalPos());
    }
}


/*! \reimp */

void Q3ListBox::mouseDoubleClickEvent(QMouseEvent *e)
{
    bool ok = true;
    Q3ListBoxItem *i = itemAt(e->pos());
    if (!i || selectionMode() == NoSelection)
        ok = false;

    d->ignoreMoves = true;

    if (d->current && ok) {
        Q3ListBoxItem * i = d->current;
        QString tmp = d->current->text();
        emit selected(currentItem());
        emit selected(i);
        if (!tmp.isNull())
            emit selected(tmp);
        emit doubleClicked(i);
    }
}


/*! \reimp */

void Q3ListBox::mouseMoveEvent(QMouseEvent *e)
{
    Q3ListBoxItem * i = itemAt(e->pos());
    if (i != d->highlighted) {
        if (i) {
            emit onItem(i);
        } else {
            emit onViewport();
        }
        d->highlighted = i;
    }

    if (d->rubber) {
        QRect r = d->rubber->normalized();
        drawRubber();
        d->rubber->setCoords(d->rubber->x(), d->rubber->y(), e->x(), e->y());
        doRubberSelection(r, d->rubber->normalized());
        drawRubber();
        return;
    }

    if (((e->state() & (Qt::RightButton | Qt::LeftButton | Qt::MidButton)) == 0) ||
         d->ignoreMoves)
        return;

    // hack to keep the combo (and what else?) working: if we get a
    // move outside the listbox without having seen a press, discard
    // it.
    if (!QRect(0, 0, visibleWidth(), visibleHeight()).contains(e->pos()) &&
         (d->mousePressColumn < 0 && d->mousePressRow < 0 ||
           (e->state() == Qt::NoButton && !d->pressedItem)))
        return;

    // figure out in what direction to drag-select and perhaps scroll
    int dx = 0;
    int x = e->x();
    if (x >= visibleWidth()) {
        x = visibleWidth()-1;
        dx = 1;
    } else if (x < 0) {
        x = 0;
        dx = -1;
    }
    d->mouseMoveColumn = columnAt(x + contentsX());

    // sanitize mousePressColumn, if we got here without a mouse press event
    if (d->mousePressColumn < 0 && d->mouseMoveColumn >= 0)
        d->mousePressColumn = d->mouseMoveColumn;
    if (d->mousePressColumn < 0 && d->currentColumn >= 0)
        d->mousePressColumn = d->currentColumn;

    // if it's beyond the last column, use the last one
    if (d->mouseMoveColumn < 0)
        d->mouseMoveColumn = dx >= 0 ? numColumns()-1 : 0;

    // repeat for y
    int dy = 0;
    int y = e->y();
    if (y >= visibleHeight()) {
        y = visibleHeight()-1;
        dy = 1;
    } else if (y < 0) {
        y = 0;
        dy = -1;
    }
    d->mouseMoveRow = rowAt(y + contentsY());

    if (d->mousePressRow < 0 && d->mouseMoveRow >= 0)
        d->mousePressRow = d->mouseMoveRow;
    if (d->mousePressRow < 0 && d->currentRow >= 0)
        d->mousePressRow = d->currentRow;

    if (d->mousePressRow < 0)
        d->mousePressRow = rowAt(x + contentsX());

    d->scrollPos = QPoint(dx, dy);

    if ((dx || dy) && !d->scrollTimer && e->state() == Qt::LeftButton && e->button() != Qt::LeftButton) {
        // start autoscrolling if necessary
        d->scrollTimer = new QTimer(this);
        connect(d->scrollTimer, SIGNAL(timeout()),
                 this, SLOT(doAutoScroll()));
        d->scrollTimer->start(100, false);
        doAutoScroll();
    } else if (!d->scrollTimer) {
        // or just select the required bits
        updateSelection();
    }
}



void Q3ListBox::updateSelection()
{
    if (d->mouseMoveColumn >= 0 && d->mouseMoveRow >= 0 &&
         d->mousePressColumn >= 0 && d->mousePressRow >= 0) {
        Q3ListBoxItem * i = item(d->mouseMoveColumn * numRows() +
                                 d->mouseMoveRow);
#ifndef QT_NO_ACCESSIBILITY
        int ind = index(i);
#endif
        if (selectionMode() == Single || selectionMode() == NoSelection) {
            if (i && (d->mouseInternalPress || (windowType() == Qt::Popup)))
                setCurrentItem(i);
        } else {
            if (d->selectionMode == Extended && (
                 (d->current == d->pressedItem && d->pressedSelected) ||
                (d->dirtyDrag && !d->dragging))) {
                if (d->dirtyDrag && !d->dragging) // emit after dragging stops
                    d->dirtyDrag = false;
                else
                    clearSelection(); // don't reset drag-selected items
                d->pressedItem = 0;
                if (i && i->isSelectable()) {
                    bool block = signalsBlocked();
                    blockSignals(true);
                    i->s = true;
                    blockSignals(block);
                    emit selectionChanged();
#ifndef QT_NO_ACCESSIBILITY
                    QAccessible::updateAccessibility(viewport(), ind+1, QAccessible::StateChanged);
                    QAccessible::updateAccessibility(viewport(), 0, QAccessible::Selection);
                    QAccessible::updateAccessibility(viewport(), ind+1, QAccessible::SelectionAdd);
#endif
                }
                triggerUpdate(false);
            } else {
                int c = qMin(d->mouseMoveColumn, d->mousePressColumn);
                int r = qMin(d->mouseMoveRow, d->mousePressRow);
                int c2 = qMax(d->mouseMoveColumn, d->mousePressColumn);
                int r2 = qMax(d->mouseMoveRow, d->mousePressRow);
                bool changed = false;
                while(c <= c2) {
                    Q3ListBoxItem * i = item(c*numRows()+r);
                    int rtmp = r;
                    while(i && rtmp <= r2) {
                        if ((bool)i->s != (bool)d->select && i->isSelectable()) {
                            i->s = d->select;
#ifndef QT_NO_ACCESSIBILITY
                            QAccessible::updateAccessibility(viewport(), ind+1, QAccessible::StateChanged);
                            QAccessible::updateAccessibility(viewport(), ind+1, d->select ? QAccessible::SelectionAdd : QAccessible::SelectionRemove);
#endif
                            i->dirty = true;
                            d->dirtyDrag = changed = true;
                        }
                        i = i->n;
                        rtmp++;
                    }
                    c++;
                }
                if (changed) {
                    if (!d->dragging) // emit after dragging stops instead
                        emit selectionChanged();
#ifndef QT_NO_ACCESSIBILITY
                    QAccessible::updateAccessibility(viewport(), 0, QAccessible::Selection);
#endif
                    triggerUpdate(false);
                }
            }
            if (i)
                setCurrentItem(i);
        }
    }
}

void Q3ListBox::repaintSelection()
{
    if (d->numColumns == 1) {
        for (uint i = topItem(); itemVisible(i) && i < count(); ++i) {
            Q3ListBoxItem *it = item(i);
            if (!it)
                break;
            if (it->isSelected())
                updateItem(it);
        }
    } else {
        for (uint i = 0; i < count(); ++i) {
            Q3ListBoxItem *it = item(i);
            if (!it)
                break;
            if (it->isSelected())
                updateItem(it);
        }
    }
}

/*! \reimp
*/

void Q3ListBox::contentsContextMenuEvent(QContextMenuEvent *e)
{
    if (!receivers(SIGNAL(contextMenuRequested(Q3ListBoxItem*,QPoint)))) {
        e->ignore();
        return;
    }
    if (e->reason() == QContextMenuEvent::Keyboard) {
        Q3ListBoxItem *i = item(currentItem());
        if (i) {
            QRect r = itemRect(i);
            emit contextMenuRequested(i, mapToGlobal(r.topLeft() + QPoint(width() / 2, r.height() / 2)));
        }
    } else {
        Q3ListBoxItem * i = itemAt(contentsToViewport(e->pos()));
        emit contextMenuRequested(i, e->globalPos());
    }
}

/*!\reimp
*/
void Q3ListBox::keyPressEvent(QKeyEvent *e)
{
    if ((e->key() == Qt::Key_Tab || e->key() == Qt::Key_Backtab)
         && e->state() & Qt::ControlButton)
        e->ignore();

    if (count() == 0) {
        e->ignore();
        return;
    }

    QPointer<Q3ListBox> selfCheck = this;

    Q3ListBoxItem *old = d->current;
    if (!old) {
        setCurrentItem(d->head);
        if (d->selectionMode == Single)
            setSelected(d->head, true);
        e->ignore();
        return;
    }

    bool selectCurrent = false;
    switch (e->key()) {
        case Qt::Key_Up:
            {
                d->currInputString.clear();
                if (currentItem() > 0) {
                    setCurrentItem(currentItem() - 1);
                    handleItemChange(old, e->state() & Qt::ShiftButton, e->state() & Qt::ControlButton);
                }
                if (!(e->state() & Qt::ShiftButton) || !d->selectAnchor)
                    d->selectAnchor = d->current;
            }
            break;
        case Qt::Key_Down:
            {
                d->currInputString.clear();
                if (currentItem() < (int)count() - 1) {
                    setCurrentItem(currentItem() + 1);
                    handleItemChange(old, e->state() & Qt::ShiftButton, e->state() & Qt::ControlButton);
                }
                if (!(e->state() & Qt::ShiftButton) || !d->selectAnchor)
                    d->selectAnchor = d->current;
            }
            break;
        case Qt::Key_Left:
            {
                d->currInputString.clear();
                if (currentColumn() > 0) {
                    setCurrentItem(currentItem() - numRows());
                    handleItemChange(old, e->state() & Qt::ShiftButton, e->state() & Qt::ControlButton);
                } else if (numColumns() > 1 && currentItem() > 0) {
                    int row = currentRow();
                    setCurrentItem(currentRow() - 1 + (numColumns() - 1) * numRows());

                    if (currentItem() == -1)
                        setCurrentItem(row - 1 + (numColumns() - 2) * numRows());

                    handleItemChange(old, e->state() & Qt::ShiftButton, e->state() & Qt::ControlButton);
                } else {
                    QApplication::sendEvent(horizontalScrollBar(), e);
                }
                if (!(e->state() & Qt::ShiftButton) || !d->selectAnchor)
                    d->selectAnchor = d->current;
            }
            break;
        case Qt::Key_Right:
            {
                d->currInputString.clear();
                if (currentColumn() < numColumns()-1) {
                    int row = currentRow();
                    int i = currentItem();
                    Q3ListBoxItem *it = item(i + numRows());
                    if (!it)
                        it = item(count()-1);
                    setCurrentItem(it);

                    if (currentItem() == -1) {
                        if (row < numRows() - 1)
                            setCurrentItem(row + 1);
                        else
                            setCurrentItem(i);
                    }

                    handleItemChange(old, e->state() & Qt::ShiftButton, e->state() & Qt::ControlButton);
                } else if (numColumns() > 1 && currentRow() < numRows()) {
                    if (currentRow() + 1 < numRows()) {
                        setCurrentItem(currentRow() + 1);
                        handleItemChange(old, e->state() & Qt::ShiftButton, e->state() & Qt::ControlButton);
                    }
                } else {
                    QApplication::sendEvent(horizontalScrollBar(), e);
                }
                if (!(e->state() & Qt::ShiftButton) || !d->selectAnchor)
                    d->selectAnchor = d->current;
            }
            break;
        case Qt::Key_Next:
            {
                d->currInputString.clear();
                int i = 0;
                if (numColumns() == 1) {
                    i = currentItem() + numItemsVisible();
                    i = i > (int)count() - 1 ? (int)count() - 1 : i;
                    setCurrentItem(i);
                    setBottomItem(i);
                } else {
                    // I'm not sure about this behavior...
                    if (currentRow() ==