90 lines
2.3 KiB
C++
90 lines
2.3 KiB
C++
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#include "QCPSizeHandleManager.h"
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QCPSizeHandleManager::QCPSizeHandleManager(QCustomPlot *parentPlot)
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: QCPLayerable(parentPlot)
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{
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}
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QCPSizeHandleManager::~QCPSizeHandleManager()
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{
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}
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void QCPSizeHandleManager::addItem(QCPAbstractItem *item, bool showHandlesLines)
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{
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if (!item || mHandles.contains(item))
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return;
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if (item->positions().size() < 2) // 要改变item的大小，最起码要两个位置
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return;
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QList<QCPSizeHandle *> handles;
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foreach (auto *position, item->positions()) {
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handles.push_back(addHandleToPosition(position));
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}
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ControlItemData data;
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data.showHandlesLines = showHandlesLines;
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data.handles = handles;
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mHandles.insert(item, data);
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}
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void QCPSizeHandleManager::handleItemMove(QCPAbstractItem *item, const QPointF &delta)
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{
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if (!item)
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return;
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auto positions = item->positions();
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foreach (auto *position, positions)
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position->setPixelPosition(position->pixelPosition() + delta);
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}
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void QCPSizeHandleManager::handleItemResize(QCPSizeHandle *sizeHandle, const QPointF &delta)
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{
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if (!sizeHandle)
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return;
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auto *parentPosition = static_cast<QCPItemPosition *>(sizeHandle->position->parentAnchor());
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if (!parentPosition)
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return;
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parentPosition->setPixelPosition(parentPosition->pixelPosition() + delta);
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}
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QCPSizeHandle *QCPSizeHandleManager::addHandleToPosition(QCPItemPosition *position)
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{
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auto *handle = new QCPSizeHandle(mParentPlot);
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handle->position->setParentAnchor(position); // 设置QCPSizeHandle的父锚点为position
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handle->setVisible(false);
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handle->setLayer(QLatin1String("overlay"));
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return handle;
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}
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void QCPSizeHandleManager::applyDefaultAntialiasingHint(QCPPainter *painter) const
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{
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applyAntialiasingHint(painter, mAntialiased, QCP::aeOther);
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}
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void QCPSizeHandleManager::draw(QCPPainter *painter)
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{
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QMapIterator<QCPAbstractItem *, ControlItemData> i(mHandles);
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while (i.hasNext()) {
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i.next();
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auto data = i.value();
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if (!data.showHandlesLines)
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continue;
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painter->setPen(data.connectHandlePen);
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QVector<QPointF> lines;
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foreach (auto *handle, data.handles)
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lines.push_back(handle->position->pixelPosition());
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painter->drawLines(lines);
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// painter->drawPolyline(QPolygonF(lines));
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}
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}
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