b257c1a7cf
- SVG node items with snap-to-grid dragging; ports appear on focus/hover and highlight compatible targets during a connection drag - Orthogonally routed edge items with line styles, head/tail decorations (arrow, circle, diamond, bar), selection halo and title labels; later edges jump crossings with arcs when enabled - Grid background view with cursor-anchored zoom, middle-button pan, rubber-band selection and palette drag-and-drop - Undoable commands: add/move/delete/connect/property/paste with clipboard fragments; light/dark/high-contrast themes - Flow overlay: animated dashes, direction and density follow flow rate Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
54 lines
1.5 KiB
C++
54 lines
1.5 KiB
C++
#pragma once
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#include <QGraphicsView>
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class QMimeData;
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namespace diag {
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class DiagramScene;
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// Canvas view: draws the rectangular grid, zooms with Ctrl+wheel (anchored
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// under the cursor), pans with the middle mouse button, rubber-band selects,
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// and accepts node-type drops from the palette.
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class GridView : public QGraphicsView {
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Q_OBJECT
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public:
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static constexpr const char* kNodeTypeMime = "application/x-diag-nodetype";
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explicit GridView(DiagramScene* scene, QWidget* parent = nullptr);
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void zoomIn();
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void zoomOut();
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void zoomReset();
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void zoomToFit();
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double zoomFactor() const;
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// Decodes a node-type mime payload and drops it at the viewport position;
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// returns true when a node was created. Called from dropEvent.
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bool handleNodeTypeDrop(const QMimeData* mime, QPoint viewportPos);
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signals:
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void zoomChanged(double factor);
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void cursorMoved(QPointF scenePos);
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protected:
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void drawBackground(QPainter* painter, const QRectF& rect) override;
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void wheelEvent(QWheelEvent* event) override;
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void mousePressEvent(QMouseEvent* event) override;
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void mouseMoveEvent(QMouseEvent* event) override;
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void mouseReleaseEvent(QMouseEvent* event) override;
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void dragEnterEvent(QDragEnterEvent* event) override;
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void dragMoveEvent(QDragMoveEvent* event) override;
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void dropEvent(QDropEvent* event) override;
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private:
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void applyZoom(double factor);
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DiagramScene* m_scene;
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bool m_panning = false;
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QPoint m_panStart;
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};
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} // namespace diag
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