C++ QQuickItem::setX方法代码示例

void Tracking::updatePositionMarker()
{
    if ( m_marbleQuickItem && m_positionMarker && m_positionMarkerType == Circle ) {
        Coordinate* position = 0;
        bool visible = (m_marbleQuickItem->model()->planetId() == QLatin1String("earth"));
        if ( m_positionSource && m_positionSource->hasPosition() ) {
            position = m_positionSource->position();
        } else if ( hasLastKnownPosition() ) {
            position = lastKnownPosition();
        } else {
            visible = false;
        }

        qreal x(0), y(0);
        if ( position ) {
            Marble::GeoDataCoordinates const pos( position->longitude(), position->latitude(), 0.0, GeoDataCoordinates::Degree );
            visible = visible && m_marbleQuickItem->map()->viewport()->screenCoordinates( pos.longitude(), pos.latitude(), x, y );
            QQuickItem* item = qobject_cast<QQuickItem*>( m_positionMarker );
            if ( item ) {
                item->setVisible( visible );
                if ( visible ) {
                    item->setX( x - item->width() / 2.0 );
                    item->setY( y - item->height() / 2.0 );
                }
            }
        }
    } else if ( m_positionMarkerType != Circle ) {
        QQuickItem* item = qobject_cast<QQuickItem*>( m_positionMarker );
        if ( item ) {
            item->setVisible( false );
        }
    }
}

QQuickItem * DataSetView::createRowNumber(int row)
{
	//std::cout << "createRowNumber("<<row<<") called!\n" << std::flush;


	if(_rowNumberDelegate == NULL)
	{
		_rowNumberDelegate = new QQmlComponent(qmlEngine(this));
		_rowNumberDelegate->setData("import QtQuick 2.10\nItem {\n"
			"property alias text: tekst.text\n"
			"Rectangle	{ color: \"lightGrey\";	anchors.fill: parent }\n"
			"Text		{ id: tekst; anchors.centerIn: parent }\n"
		"}", QUrl());
	}

	QQuickItem * rowNumber = NULL;

	if(_rowNumberItems.count(row) == 0  || _rowNumberItems[row] == NULL)
	{

		if(_rowNumberStorage.size() > 0)
		{
#ifdef DEBUG_VIEWPORT
			std::cout << "createRowNumber("<<row<<") from storage!\n" << std::flush;
#endif
			rowNumber = _rowNumberStorage.top();
			_rowNumberStorage.pop();
		}
		else
		{
#ifdef DEBUG_VIEWPORT
			std::cout << "createRowNumber("<<row<<") ex nihilo!\n" << std::flush;
#endif
			rowNumber = qobject_cast<QQuickItem*>(_rowNumberDelegate->create());
			rowNumber->setParent(this);
			rowNumber->setParentItem(this);
		}

		rowNumber->setProperty("z", 10);
		rowNumber->setProperty("text", QString::fromStdString(std::to_string(row + 1))); //Nobody wants zero-based rows...

		rowNumber->setY(_dataRowsMaxHeight * (1 + row));
		rowNumber->setZ(-3);
		rowNumber->setHeight(_dataRowsMaxHeight);
		rowNumber->setWidth(_rowNumberMaxWidth);

		rowNumber->setVisible(true);

		_rowNumberItems[row] = rowNumber;
	}
	else
		rowNumber = _rowNumberItems[row];

	rowNumber->setX(_viewportX);

	return _rowNumberItems[row];
}

void CustomUndoStack::addItem(QQuickItem *itemParent, QQmlComponent *itemComponent)
{
    if (!itemParent || !itemComponent)
        return;

    QQuickItem *item = qobject_cast<QQuickItem*>(itemComponent->create());
    if (!item) {
        qWarning() << "Failed to create item";
        return;
    }

    item->setX(mItemsAdded * 25);
    item->setY(mItemsAdded * 25);
    push(new AddCommand(itemParent, item));
    ++mItemsAdded;
}

QQuickItem * DataSetView::createTextItem(int row, int col)
{
	//std::cout << "createTextItem("<<row<<", "<<col<<") called!\n" << std::flush;

	if((_cellTextItems.count(col) == 0 && _cellTextItems[col].count(row) == 0) || _cellTextItems[col][row] == NULL)
	{

		if(_itemDelegate == NULL)
		{
			_itemDelegate = new QQmlComponent(qmlEngine(this));
			_itemDelegate->setData("import QtQuick 2.10\nText { property bool active: true; text: \"???\"; color: active ? 'black' : 'grey' }", QUrl());
		}

		QQuickItem * textItem = NULL;

		if(_textItemStorage.size() > 0)
		{
#ifdef DEBUG_VIEWPORT
			std::cout << "createTextItem("<<row<<", "<<col<<") from storage!\n" << std::flush;
#endif
			textItem = _textItemStorage.top();
			_textItemStorage.pop();
		}
		else
		{
#ifdef DEBUG_VIEWPORT
			std::cout << "createTextItem("<<row<<", "<<col<<") ex nihilo!\n" << std::flush;
#endif
			textItem = qobject_cast<QQuickItem*>(_itemDelegate->create());
			textItem->setParent(this);
			textItem->setParentItem(this);
		}

		QModelIndex ind(_model->index(row, col));
		bool active = _model->data(ind, _roleNameToRole["active"]).toBool();
		textItem->setProperty("color", active ? "black" : "grey");
		textItem->setProperty("text", _model->data(ind));
		textItem->setX(_colXPositions[col] + _itemHorizontalPadding);
		textItem->setY(-2 + _dataRowsMaxHeight + _itemVerticalPadding + row * _dataRowsMaxHeight);
		textItem->setZ(-4);
		textItem->setVisible(true);

		_cellTextItems[col][row] = textItem;
	}

	return _cellTextItems[col][row];
}

void StretchRow::layoutChildrenWithDefaultSize() {
	//static int count = 0;
	//qDebug() << "Row Default Size" << ++count;
	Q_ASSERT(m_defaultSize != 0);

	const QList<QQuickItem *> childrenList = childItems();
	if (childrenList.isEmpty()) return;

    const int layoutHeight = height();
	qreal currX = m_leftMargin;
    for (QList<QQuickItem *>::const_iterator it = childrenList.constBegin(); it != childrenList.constEnd(); ++it) {
		QQuickItem* child = (*it);
		if (child == Q_NULLPTR || !child->isVisible()) {
			continue;
		}

		// add spacing if it is not the first item:
		if (currX > 0) {
			currX += m_spacing;
		}
		if (currX != child->x()) child->setX(currX);
		// check if item has a stretch proportion set:
		if (child->implicitWidth() < 0) {
			// yes -> set it to default size:
			qreal newWidth = m_defaultSize * child->implicitWidth() * -1;
			if (newWidth != child->width()) child->setWidth(newWidth);
		}
		// set height of all items to fill the layout:
		if (layoutHeight != child->height()) child->setHeight(layoutHeight);
		currX += child->width();
	}
	currX += m_rightMargin;

	// set implicit size to fit all items:
	if (currX != implicitWidth()) setImplicitWidth(currX);
}

void StretchRow::layoutChildrenWithProportions() {
	//static int count = 0;
	//qDebug() << "Row Proportions" << ++count;
	const QList<QQuickItem*> childrenList = childItems();
	if (childrenList.isEmpty()) return;
	if (width() <= 0) return;
	int visibleItems = 0;
    qreal availableForStretch = width() - m_leftMargin - m_rightMargin;
	qreal sumStretchProportions = 0.0;

	// iterate over all children and calculate available size to stretch items:
    for (QList<QQuickItem *>::const_iterator it = childrenList.constBegin(); it != childrenList.constEnd(); ++it) {
		QQuickItem* child = (*it);
		if (child == Q_NULLPTR || !child->isVisible()) {
			continue;
		}

		if (child->implicitWidth() >= 0) {
			// no stretch proportion set -> leave size and remove it from available space:
			availableForStretch -= child->width();
		} else {
			// a stretch proportion is set -> add it to sum:
			sumStretchProportions += (child->implicitWidth() * -1);
		}
		visibleItems++;
	}
	// remove spacing from available space:
	availableForStretch -= m_spacing * (visibleItems - 1);

    const int layoutHeight = height();
    QPointer<QQuickItem> lastStretchItem = nullptr;
    qreal currX = m_leftMargin;
    for (QList<QQuickItem *>::const_iterator it = childrenList.constBegin(); it != childrenList.constEnd(); ++it) {
		QQuickItem* child = (*it);
		if (child == Q_NULLPTR || !child->isVisible()) {
			continue;
		}

		// add spacing if it is not the first item:
		if (currX > 0) {
			currX += m_spacing;
        }
        if (currX != child->x()) child->setX(currX);
		// check if item has a stretch proportion set (if not do nothing):
		if (child->implicitWidth() < 0) {
			// get the stretch proportion:
			qreal stretchProportion = (child->implicitWidth() * -1);
			// calculate the relation of the total space available for stretched items
			// that this item will use:
			// (sumStretchProportion can not be 0 (in divison) because if this "if" is executed,
			// there has been at least one item with a stretch proportion set)
			qreal relationOfSpaceAvailableForStretch = stretchProportion / sumStretchProportions;
            qreal newWidth = qRound(availableForStretch * relationOfSpaceAvailableForStretch);
            if (newWidth != child->width()) child->setWidth(newWidth);
			lastStretchItem = child;
		}
        // set height of all items to fill the layout:
        if (layoutHeight != child->height()) child->setHeight(layoutHeight);
		currX += child->width();
	}
	currX += m_rightMargin;

	// check if last item fills whole remaining space in this layout:
	// (can happen because of rounding mistakes)
	if (lastStretchItem) {
		double pxMissing = width() - currX;
        if (pxMissing > 0.0001) {
            // qInfo() << "StretchRow layout mismatch: " << pxMissing;
			// it does not -> adjust it:
			lastStretchItem->setWidth(lastStretchItem->width() + pxMissing);
		}
	}
}

void QQuickComponentsLinearLayout::reconfigureLayout()
{
    if (!isComponentComplete())
        return;

    const int count = m_items.count();

    if (count == 0)
        return;

    qreal totalSpacing = 0;
    qreal totalSizeHint = 0;
    qreal totalMinimumSize = 0;
    qreal totalMaximumSize = 0;

    QVector<QQuickComponentsLayoutInfo> itemData;

    for (int i = 0; i < count; i++) {
        QQuickItem *item = m_items.at(i);
        QObject *attached = qmlAttachedPropertiesObject<QQuickComponentsLayout>(item);
        QQuickComponentsLayoutAttached *info = static_cast<QQuickComponentsLayoutAttached *>(attached);

        QQuickComponentsLayoutInfo data;

        if (m_orientation == Horizontal) {
            data.sizeHint = item->implicitWidth();
            data.minimumSize = info->minimumWidth();
            data.maximumSize = info->maximumWidth();
            data.expansive = (info->horizontalSizePolicy() == QQuickComponentsLayout::Expanding);
            data.stretch = info->horizontalSizePolicy() == Expanding ? 1.0 : 0;
        } else {
            data.sizeHint = item->implicitHeight();
            data.minimumSize = info->minimumHeight();
            data.maximumSize = info->maximumHeight();
            data.expansive = (info->verticalSizePolicy() == QQuickComponentsLayout::Expanding);
            data.stretch = info->verticalSizePolicy() == Expanding ? 1.0 : 0;
        }

        itemData.append(data);

        // sum
        totalSizeHint += data.sizeHint;
        totalMinimumSize += data.minimumSize;
        totalMaximumSize += data.maximumSize;

        // don't count last spacing
        if (i < count - 1)
            totalSpacing += data.spacing + m_spacing;
    }

    if (m_orientation == Horizontal) {
        qDeclarativeLayoutCalculate(itemData, 0, count, 0, width(), m_spacing);

        for (int i = 0; i < count; i++) {
            QQuickItem *item = m_items.at(i);
            const QQuickComponentsLayoutInfo &data = itemData.at(i);

            item->setX(data.pos);
            item->setY(height()/2 - item->height()/2);
            item->setWidth(data.size);
        }
    } else {
        qDeclarativeLayoutCalculate(itemData, 0, count, 0, height(), m_spacing);

        for (int i = 0; i < count; i++) {
            QQuickItem *item = m_items.at(i);
            const QQuickComponentsLayoutInfo &data = itemData.at(i);

            item->setY(data.pos);
            item->setX(width()/2 - item->width()/2);
            item->setHeight(data.size);
        }
    }

    // propagate hints to upper levels
    QObject *attached = qmlAttachedPropertiesObject<QQuickComponentsLayout>(this);
    QQuickComponentsLayoutAttached *info = static_cast<QQuickComponentsLayoutAttached *>(attached);

    if (m_orientation == Horizontal) {
        setImplicitWidth(totalSizeHint);
        info->setMinimumWidth(totalMinimumSize + totalSpacing);
        info->setMaximumWidth(totalMaximumSize + totalSpacing);
    } else {
        setImplicitHeight(totalSizeHint);
        info->setMinimumHeight(totalMinimumSize + totalSpacing);
        info->setMaximumHeight(totalMaximumSize + totalSpacing);
    }
}