Client API. The Codename One framework your app is built on: this runs on the device, not in a backend.

public class NodeGraph

  1. Object
  2. Component
  3. Container
  4. NodeGraph

ImplementsAnimation, Editable, Iterable<Component>, StyleListener

A pannable, zoomable view of a GraphModel where nodes are dragged, connected and grouped: a system diagram, a mind map, or a node editor.

DefaultGraphModel model = new DefaultGraphModel();
model.addNode(new GraphNode("api", "API gateway"));
model.addNode(new GraphNode("orders", "Orders"));
model.addEdge("api", "orders");
NodeGraph graph = new NodeGraph(model);
graph.arrange(new LayeredArrangement(), false);
Form form = new Form("Services", new BorderLayout());
form.add(BorderLayout.CENTER, graph);
form.show();

What a user can do:

  • drag the background to pan, with a fling; pinch, or Ctrl or Cmd with the wheel, to zoom about the pointer;
  • tap a node or an edge to select it, and Shift-tap to add to the selection; drag a node to move it, with everything selected;
  • drag from an output port to an input port to connect them. A node without ports shows a handle on its trailing edge while it is selected, and a long press on it starts a connection too;
  • drag the end of an edge off an input port to reconnect or drop it;
  • long press the background, or Shift-drag it, to select with a box;
  • tap a group’s title to collapse or expand it, double tap a node to open it (and edit its label when setLabelEditing is on);
  • drag in the minimap to move the view.

Every edit is offered to the GraphListeners, then to the model; either may refuse it. With setEditingEnabled(false) the graph can only be panned, zoomed and selected.

The nodes and edges are painted, so the component costs what is on screen: below getDetailZoom they are drawn without text, which keeps a graph of thousands of nodes moving at frame rate. A node can still carry a real component from a NodeComponentFactory.

Fields

public static final int EDGE_AUTO = 0Edges with ports curve between them; other edges are straight, or follow the bends an arrangement gave them.
public static final int EDGE_STRAIGHT = 1Straight segments through the bends.
public static final int EDGE_ORTHOGONAL = 2Horizontal and vertical segments only.
public static final int EDGE_CURVED = 3Smooth curves through the bends.

Constructors

public NodeGraph()An empty graph backed by a new DefaultGraphModel.
public NodeGraph(GraphModel model)A graph showing model.

Methods

public GraphModel getModel()The model shown.
public void setModel(GraphModel model)Shows another model, and clears the selection.
public GraphNodeRenderer getNodeRenderer()Paints nodes.
public void setNodeRenderer(GraphNodeRenderer r)Replaces the node painter; null restores the default.
public GraphEdgeRenderer getEdgeRenderer()Paints edges.
public void setEdgeRenderer(GraphEdgeRenderer r)Replaces the edge painter; null restores the default.
public void addGraphListener(GraphListener l)Adds a listener.
public void removeGraphListener(GraphListener l)Removes a listener.
public boolean isEditingEnabled()True, the default, when the user may move, connect and remove.
public void setEditingEnabled(boolean editable)Allows or forbids edits; panning, zooming and selecting stay.
public int getEdgeStyle()One of EDGE_AUTO, the default, EDGE_STRAIGHT, EDGE_ORTHOGONAL or EDGE_CURVED.
public void setEdgeStyle(int edgeStyle)Sets how edges are drawn.
public boolean isGridVisible()True, the default, when a dot grid is painted behind the graph.
public void setGridVisible(boolean gridVisible)Shows or hides the dot grid.
public double getSnap()The step dragged nodes snap to in world units, or 0 for none.
public void setSnap(double snap)Snaps dragged nodes to a step; 0 turns it off.
public boolean isMinimapVisible()True when a minimap of the whole graph is painted in a corner.
public void setMinimapVisible(boolean minimapVisible)Shows or hides the minimap.
public boolean isLabelEditing()True when a double tap edits the node’s label in place.
public void setLabelEditing(boolean labelEditing)Lets a double tap edit a node’s label in place.
public float getDetailZoom()The zoom below which nodes and edges are drawn without text.
public void setDetailZoom(float detailZoom)Sets the zoom below which text is not drawn.
public float getComponentZoom()The zoom below which nodes show no component from the factory.
public void setComponentZoom(float componentZoom)Sets the zoom below which components are hidden.
public void setNodeComponentFactory(NodeComponentFactory f)Makes components for node bodies; null for none.
public NodeComponentFactory getNodeComponentFactory()The factory, or null.
public Component getNodeComponent(GraphNode node)The component made for a node, or null when none was made yet.
public void setZoomRange(float min, float max)Limits the zoom.
public float getZoom()The current zoom.
public void setZoom(float z)Zooms about the centre of the view.
public double getViewX()The world x at the left edge of the view.
public double getViewY()The world y at the top edge of the view.
public void setView(double worldX, double worldY)Scrolls so the world point is at the top left corner of the view.
public void centerOn(GraphNode node)Scrolls so the node is in the middle of the view.
public void fitToView()Zooms and scrolls so the whole graph fits the view, never past zoom 1.
public boolean zoomAt(float factor, int screenX, int screenY)Multiplies the zoom by factor keeping the world point under the screen point where it is.
public int worldToScreenX(double wx)A world x as a pixel from the left of the view.
public int worldToScreenY(double wy)A world y as a pixel from the top of the view.
public int worldToScreenLength(double len)A world length in pixels.
public double screenToWorldX(int sx)A pixel from the left of the view as a world x.
public double screenToWorldY(int sy)A pixel from the top of the view as a world y.
public List<GraphNode> getSelectedNodes()The selected nodes, in the order they were selected.
public GraphEdge getSelectedEdge()The selected edge, or null.
public boolean isSelected(GraphNode node)True when the node is selected.
public void select(GraphNode node)Selects one node alone, or clears the selection with null.
public void selectEdge(GraphEdge edge)Selects one edge alone.
public void toggleSelection(GraphNode node)Adds a node to the selection, or takes it out when it is in.
public void deleteSelection()Removes the selected nodes and edge, each offered to the listeners and then to the model.
public void arrange(GraphArrangement arrangement, boolean animate)Places the nodes with an arrangement, gliding them there when animate is true.
public void setLiveArrangement(ForceArrangement arrangement)Runs a force arrangement live: the graph settles a step a frame, and follows a node while it is dragged.
public void startLabelEdit(GraphNode node)Edits a node’s label in place, in a text field over the node; the new label goes to GraphModel.renameNode when editing ends.
public double portX(GraphNode node, GraphPort port)The world x of a port’s anchor: inputs on the leading edge, outputs on the trailing one.
public double portY(GraphNode node, GraphPort port)The world y of a port’s anchor: the ports of one side share the body under the title evenly.
public double[] getGroupRect(GraphGroup group)A group’s frame in world units, {x, y, width, height}, or null for a group with no members.
public boolean isNodeVisible(GraphNode n)True when a node is drawn: it is not inside a collapsed group.
public Image toImage(int width, int height)Paints the whole graph into a new image of the given size, fitted with a margin, at no more than zoom 1, without the minimap or the selection.
public GraphNode nodeAt(int sx, int sy)The topmost visible node at a point of the view, or null.
public GraphEdge edgeAt(int sx, int sy)The edge within a finger’s reach of a point of the view, or null.
protected void initComponent()Allows subclasses to bind functionality that relies on fully initialized and “ready for action” component state
public void layoutContainer()Performs the layout of the container if a layout is necessary
protected Dimension calcPreferredSize()Calculates the preferred size based on component content.

Inherited fields

From Component

DEFAULT_CURSOR, CROSSHAIR_CURSOR, TEXT_CURSOR, WAIT_CURSOR, SW_RESIZE_CURSOR, SE_RESIZE_CURSOR, NW_RESIZE_CURSOR, NE_RESIZE_CURSOR, N_RESIZE_CURSOR, S_RESIZE_CURSOR, W_RESIZE_CURSOR, E_RESIZE_CURSOR, HAND_CURSOR, MOVE_CURSOR, DRAG_REGION_NOT_DRAGGABLE, DRAG_REGION_POSSIBLE_DRAG_X, DRAG_REGION_POSSIBLE_DRAG_Y, DRAG_REGION_POSSIBLE_DRAG_XY, DRAG_REGION_LIKELY_DRAG_X, DRAG_REGION_LIKELY_DRAG_Y, DRAG_REGION_LIKELY_DRAG_XY, DRAG_REGION_IMMEDIATELY_DRAG_X, DRAG_REGION_IMMEDIATELY_DRAG_Y, DRAG_REGION_IMMEDIATELY_DRAG_XY, BRB_CONSTANT_ASCENT, BRB_CONSTANT_DESCENT, BRB_CENTER_OFFSET, BRB_OTHER, CENTER, TOP, LEFT, BOTTOM, RIGHT, BASELINE

Inherited methods

From Container

encloseIn, encloseIn, initLaf, getUIManager, setUIManager, isSurface, add, addAll, add, add, add, add, add, getLeadComponent, setLeadComponent, getLeadParent, keyPressed, keyReleased, getLayout, setLayout, invalidate, setShouldLayout, setShouldCalcPreferredSize, getLayoutWidth, getLayoutHeight, applyRTL, constrainWidthWhenScrollable, constrainHeightWhenScrollable, addComponent, addComponent, addComponent, addComponent, replaceAndWait, replaceAndWait, replace, replaceAndWait, replace, createReplaceTransition, isEnabled, setEnabled, removeComponent, cancelRepaints, flushReplace, removeAll, revalidateWithAnimationSafety, revalidate, revalidateLater, forceRevalidate, clearClientProperties, paint, paintGlass, isSafeArea, setSafeArea, isSafeAreaRoot, getSafeAreaRoot, setSafeAreaRoot, getComponentCount, getComponentAt, getComponentIndex, contains, scrollComponentToVisible, getClosestComponentTo, getResponderAt, getComponentAt, findDropTargetAt, pointerPressed, paramString, refreshTheme, isScrollableX, setScrollableX, isScrollableY, setScrollableY, getSideGap, getBottomGap, setScrollable, setCellRenderer, getScrollIncrement, setScrollIncrement, findFirstFocusable, dragInitiated, fireClicked, isSelectableInteraction, getGridPosY, paintComponentBackground, getGridPosX, animateHierarchyAndWait, createAnimateHierarchy, animateHierarchy, animateHierarchyFadeAndWait, createAnimateHierarchyFade, animateHierarchyFade, animateLayoutFadeAndWait, createAnimateLayoutFadeAndWait, animateLayoutFade, createAnimateLayoutFade, animateLayoutAndWait, animateLayout, updateTabIndices, createAnimateLayout, drop, createAnimateMotion, morph, morphAndWait, animateUnlayout, animateUnlayoutAndWait, createAnimateUnlayout, getChildrenAsList, iterator, iterator

From Component

setSameSize, isSetCursorSupported, parsePreferredSize, getDefaultDragTransparency, setDefaultDragTransparency, getEditingDelegate, setEditingDelegate, getCursor, setCursor, showNativeOverlay, hideNativeOverlay, updateNativeOverlay, getNativeOverlay, getAllStyles, getSameWidth, setSameWidth, getSameHeight, setSameHeight, getX, setX, getOuterX, getInnerX, getY, setY, getOuterY, getInnerY, isVisible, setVisible, getClientProperty, stripMarginAndPadding, putClientProperty, getDirtyRegion, setDirtyRegion, isOpaque, setOpaque, getWidth, setWidth, getOuterWidth, getInnerWidth, getHeight, setHeight, getOuterHeight, getInnerHeight, isDragRegion, getDragRegionStatus, getBaseline, getBaselineResizeBehavior, getPreferredSizeStr, setPreferredSizeStr, getPreferredSize, setPreferredSize, getScrollDimension, calcScrollSize, setScrollSize, getPreferredW, setPreferredW, getPreferredH, setPreferredH, getOuterPreferredH, getInnerPreferredH, getOuterPreferredW, getInnerPreferredW, setSize, getUIID, setUIID, setUIIDFinal, setUIID, getInlineAllStyles, setInlineAllStyles, getInlineSelectedStyles, setInlineSelectedStyles, getInlineUnselectedStyles, setInlineUnselectedStyles, getInlineDisabledStyles, setInlineDisabledStyles, getInlinePressedStyles, setInlinePressedStyles, remove, getParent, getOwner, setOwner, isOwnedBy, containsOrOwns, addFocusListener, removeFocusListener, addScrollListener, removeScrollListener, getSelectCommandText, setSelectCommandText, getLabelForComponent, setLabelForComponent, focusGained, focusLost, paintBackgrounds, paintShadows, getAbsoluteX, getAbsoluteY, isInClippingRegion, paintIntersectingComponentsAbove, paintScrollbars, paintScrollbarX, getScrollOpacity, getSelectedRect, paintScrollbarY, paintComponent, paintComponent, getBorder, getScrollable, paintBackground, isScrollable, getScrollX, setScrollX, getScrollY, setScrollY, onScrollX, onScrollY, getDraggedx, getDraggedy, contains, visibleBoundsContains, hasFixedPreferredSize, getBounds, getBounds, getVisibleBounds, getVisibleBounds, isFocusable, setFocusable, onSetFocusable, resetFocusable, getTabIndex, setTabIndex, getPreferredTabIndex, setPreferredTabIndex, isTraversable, setTraversable, handlesInput, setHandlesInput, consumesRawTextInput, hasFocus, setFocus, getComponentForm, getTopLevelContainer, repaint, repaint, longKeyPress, keyRepeated, registerForAnimation, deregisterFromAnimation, getAnimationManager, getScrollAnimationSpeed, setScrollAnimationSpeed, isBlockLead, setBlockLead, isIgnorePointerEvents, setIgnorePointerEvents, isRippleEffect, setRippleEffect, getInlineStylesTheme, setInlineStylesTheme, shouldRenderComponentSelection, isHideInLandscape, setHideInLandscape, createStyleAnimation, isSmoothScrolling, setSmoothScrolling, pointerHover, stopScrollMomentum, pointerHoverReleased, pointerHoverPressed, pinch, pinchReleased, pinch, rotation, isPinchBlocksDragAndDrop, setPinchBlocksDragAndDrop, pointerDragged, getDragImage, getDragTransparency, setDragTransparency, toImage, drawDraggedImage, draggingOver, dragEnter, dragExit, addPullToRefresh, setPullToRefresh, respondsToPointerEvents, pointerDragged, isStickyDrag, pointerPressed, isDragAndDropOperation, pointerReleased, longPointerPress, pointerReleased, setVerticalScrollBounds, setHorizontalScrollBounds, isVScrollThumbGrabbed, isHScrollThumbGrabbed, isVScrollThumbHover, isHScrollThumbHover, isTensileDragEnabled, setTensileDragEnabled, getTextSelectionSupport, addDropListener, removeDropListener, addDragOverListener, removeDragOverListener, isNativeDragSource, setNativeDragSource, getNativeDragOperation, setNativeDragOperation, createNativeDragOperation, isNativeDropTarget, setNativeDropTarget, getAcceptedDropMimeTypes, setAcceptedDropMimeTypes, getAcceptedDropActions, setAcceptedDropActions, canAcceptNativeDrop, nativeDragEnter, nativeDragOver, nativeDragExit, nativeDrop, addNativeDropListener, removeNativeDropListener, addNativeDragOverListener, removeNativeDragOverListener, dragFinished, addDragFinishedListener, addStateChangeListener, removeStateChangeListener, addPointerPressedListener, addLongPressListener, addContextMenuListener, removeContextMenuListener, addMouseWheelListener, removeMouseWheelListener, addStylusListener, removeStylusListener, getContextMenuCommands, setContextMenuCommands, mouseWheel, paintRippleOverlay, removePointerPressedListener, removeLongPressListener, removeDragFinishedListener, addPointerReleasedListener, removePointerReleasedListener, addPointerDraggedListener, removePointerDraggedListener, getDragSpeed, getStyle, getPressedStyle, getHoverStyle, setHoverStyle, isHovered, setHovered, setPressedStyle, initUnselectedStyle, initPressedStyle, initDisabledStyle, initSelectedStyle, getUnselectedStyle, setUnselectedStyle, getSelectedStyle, setSelectedStyle, getDisabledStyle, setDisabledStyle, installDefaultPainter, requestFocus, toString, refreshTheme, refreshTheme, isDragActivated, animate, scrollRectToVisible, scrollRectToVisible, paintBorder, paintBorderBackground, isCellRenderer, isScrollVisible, setScrollVisible, setIsScrollVisible, startEditingAsync, stopEditing, isEditing, isEditable, laidOut, deinitialize, isInitialized, setInitialized, styleChanged, getNextFocusDown, setNextFocusDown, getNextFocusUp, setNextFocusUp, getNextFocusLeft, setNextFocusLeft, getNextFocusRight, setNextFocusRight, getName, setName, initCustomStyle, deinitializeCustomStyle, isRTL, setRTL, isTactileTouch, isTactileTouch, setTactileTouch, getPropertyNames, getPropertyTypes, getPropertyTypeNames, getPropertyValue, setPropertyValue, paintLockRelease, paintLock, isSnapToGrid, setSnapToGrid, shouldBlockSideSwipe, shouldBlockSideSwipeLeft, shouldBlockSideSwipeRight, blocksSideSwipe, isFlatten, setFlatten, getTensileLength, setTensileLength, isGrabsPointerEvents, setGrabsPointerEvents, getScrollOpacityChangeSpeed, setScrollOpacityChangeSpeed, growShrink, isAlwaysTensile, setAlwaysTensile, isDraggable, setDraggable, isDropTarget, setDropTarget, isChildOf, isHideInPortrait, setHideInPortrait, getBindablePropertyNames, getBindablePropertyTypes, bindProperty, unbindProperty, getBoundPropertyValue, setBoundPropertyValue, getCloudBoundProperty, setCloudBoundProperty, getCloudDestinationProperty, setCloudDestinationProperty, getComponentState, setComponentState, setHidden, isHidden, setHidden, isHidden, announceForAccessibility, getAccessibilityText, setAccessibilityText, getSemantics, getAccessibilityNode, accessibilityChanged, accessibilityChanged, getTooltip, setTooltip

From Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait, clone, finalize

From Iterable

forEach, spliterator

Field details

EDGE_AUTO

public static final int EDGE_AUTO = 0
Edges with ports curve between them; other edges are straight, or follow the bends an arrangement gave them.

EDGE_STRAIGHT

public static final int EDGE_STRAIGHT = 1
Straight segments through the bends.

EDGE_ORTHOGONAL

public static final int EDGE_ORTHOGONAL = 2
Horizontal and vertical segments only.

EDGE_CURVED

public static final int EDGE_CURVED = 3
Smooth curves through the bends.

Constructor details

NodeGraph

public NodeGraph()
An empty graph backed by a new DefaultGraphModel.

NodeGraph

public NodeGraph(GraphModel model)
A graph showing model.

Method details

getModel

public GraphModel getModel()
The model shown.

setModel

public void setModel(GraphModel model)
Shows another model, and clears the selection.

getNodeRenderer

public GraphNodeRenderer getNodeRenderer()
Paints nodes. Never null.

setNodeRenderer

public void setNodeRenderer(GraphNodeRenderer r)
Replaces the node painter; null restores the default.

getEdgeRenderer

public GraphEdgeRenderer getEdgeRenderer()
Paints edges. Never null.

setEdgeRenderer

public void setEdgeRenderer(GraphEdgeRenderer r)
Replaces the edge painter; null restores the default.

addGraphListener

public void addGraphListener(GraphListener l)
Adds a listener.

removeGraphListener

public void removeGraphListener(GraphListener l)
Removes a listener.

isEditingEnabled

public boolean isEditingEnabled()
True, the default, when the user may move, connect and remove.

setEditingEnabled

public void setEditingEnabled(boolean editable)
Allows or forbids edits; panning, zooming and selecting stay.

getEdgeStyle

public int getEdgeStyle()
One of EDGE_AUTO, the default, EDGE_STRAIGHT, EDGE_ORTHOGONAL or EDGE_CURVED.

setEdgeStyle

public void setEdgeStyle(int edgeStyle)
Sets how edges are drawn.

isGridVisible

public boolean isGridVisible()
True, the default, when a dot grid is painted behind the graph.

setGridVisible

public void setGridVisible(boolean gridVisible)
Shows or hides the dot grid.

getSnap

public double getSnap()
The step dragged nodes snap to in world units, or 0 for none.

setSnap

public void setSnap(double snap)
Snaps dragged nodes to a step; 0 turns it off.

isMinimapVisible

public boolean isMinimapVisible()
True when a minimap of the whole graph is painted in a corner.

setMinimapVisible

public void setMinimapVisible(boolean minimapVisible)
Shows or hides the minimap.

isLabelEditing

public boolean isLabelEditing()
True when a double tap edits the node’s label in place.

setLabelEditing

public void setLabelEditing(boolean labelEditing)
Lets a double tap edit a node’s label in place.

getDetailZoom

public float getDetailZoom()
The zoom below which nodes and edges are drawn without text.

setDetailZoom

public void setDetailZoom(float detailZoom)
Sets the zoom below which text is not drawn.

getComponentZoom

public float getComponentZoom()
The zoom below which nodes show no component from the factory.

setComponentZoom

public void setComponentZoom(float componentZoom)
Sets the zoom below which components are hidden.

setNodeComponentFactory

public void setNodeComponentFactory(NodeComponentFactory f)
Makes components for node bodies; null for none.

getNodeComponentFactory

public NodeComponentFactory getNodeComponentFactory()
The factory, or null.

getNodeComponent

public Component getNodeComponent(GraphNode node)
The component made for a node, or null when none was made yet.

setZoomRange

public void setZoomRange(float min, float max)
Limits the zoom.

getZoom

public float getZoom()
The current zoom. At zoom 1 a node is drawn at its world size scaled to the theme font, so labels fit on dense screens as they do on a desktop; fitToView never goes past it.

setZoom

public void setZoom(float z)
Zooms about the centre of the view.

getViewX

public double getViewX()
The world x at the left edge of the view.

getViewY

public double getViewY()
The world y at the top edge of the view.

setView

public void setView(double worldX, double worldY)
Scrolls so the world point is at the top left corner of the view.

centerOn

public void centerOn(GraphNode node)
Scrolls so the node is in the middle of the view.

fitToView

public void fitToView()
Zooms and scrolls so the whole graph fits the view, never past zoom 1.

zoomAt

public boolean zoomAt(float factor, int screenX, int screenY)
Multiplies the zoom by factor keeping the world point under the screen point where it is.

Returns

false when the zoom was already at its limit

worldToScreenX

public int worldToScreenX(double wx)
A world x as a pixel from the left of the view.

worldToScreenY

public int worldToScreenY(double wy)
A world y as a pixel from the top of the view.

worldToScreenLength

public int worldToScreenLength(double len)
A world length in pixels.

screenToWorldX

public double screenToWorldX(int sx)
A pixel from the left of the view as a world x.

screenToWorldY

public double screenToWorldY(int sy)
A pixel from the top of the view as a world y.

getSelectedNodes

public List<GraphNode> getSelectedNodes()
The selected nodes, in the order they were selected. A copy.

getSelectedEdge

public GraphEdge getSelectedEdge()
The selected edge, or null.

isSelected

public boolean isSelected(GraphNode node)
True when the node is selected.

select

public void select(GraphNode node)
Selects one node alone, or clears the selection with null.

selectEdge

public void selectEdge(GraphEdge edge)
Selects one edge alone.

toggleSelection

public void toggleSelection(GraphNode node)
Adds a node to the selection, or takes it out when it is in.

deleteSelection

public void deleteSelection()
Removes the selected nodes and edge, each offered to the listeners and then to the model.

arrange

public void arrange(GraphArrangement arrangement, boolean animate)
Places the nodes with an arrangement, gliding them there when animate is true. Arrangements are not user edits: a model that refuses moves is placed anyway, the nodes moved directly.

setLiveArrangement

public void setLiveArrangement(ForceArrangement arrangement)
Runs a force arrangement live: the graph settles a step a frame, and follows a node while it is dragged. Null stops it.

startLabelEdit

public void startLabelEdit(GraphNode node)
Edits a node’s label in place, in a text field over the node; the new label goes to GraphModel.renameNode when editing ends.

portX

public double portX(GraphNode node, GraphPort port)
The world x of a port’s anchor: inputs on the leading edge, outputs on the trailing one.

portY

public double portY(GraphNode node, GraphPort port)
The world y of a port’s anchor: the ports of one side share the body under the title evenly.

getGroupRect

public double[] getGroupRect(GraphGroup group)
A group’s frame in world units, {x, y, width, height}, or null for a group with no members. A collapsed group’s frame is its node.

isNodeVisible

public boolean isNodeVisible(GraphNode n)
True when a node is drawn: it is not inside a collapsed group.

toImage

public Image toImage(int width, int height)
Paints the whole graph into a new image of the given size, fitted with a margin, at no more than zoom 1, without the minimap or the selection. For a thumbnail, a share sheet or a printout.

nodeAt

public GraphNode nodeAt(int sx, int sy)
The topmost visible node at a point of the view, or null.

edgeAt

public GraphEdge edgeAt(int sx, int sy)
The edge within a finger’s reach of a point of the view, or null.

initComponent

protected void initComponent()
Allows subclasses to bind functionality that relies on fully initialized and “ready for action” component state

layoutContainer

public void layoutContainer()
Performs the layout of the container if a layout is necessary

calcPreferredSize

protected Dimension calcPreferredSize()
Calculates the preferred size based on component content. This method is invoked lazily by getPreferred size.

Returns

the calculated preferred size based on component content