mxGraphHandler.prototype.mouseMove = function()

in airavata-kubernetes/workflow-composer/src/js/handler/mxGraphHandler.js [673:838]
133 lines of code
47 McCabe index (conditional complexity)

mxGraphHandler.prototype.mouseMove = function(sender, me)
{
	var graph = this.graph;

	if (!me.isConsumed() && graph.isMouseDown && this.cell != null &&
		this.first != null && this.bounds != null)
	{
		// Stops moving if a multi touch event is received
		if (mxEvent.isMultiTouchEvent(me.getEvent()))
		{
			this.reset();
			return;
		}
		
		var delta = this.getDelta(me);
		var dx = delta.x;
		var dy = delta.y;
		var tol = graph.tolerance;

		if (this.shape != null || Math.abs(dx) > tol || Math.abs(dy) > tol)
		{
			// Highlight is used for highlighting drop targets
			if (this.highlight == null)
			{
				this.highlight = new mxCellHighlight(this.graph,
					mxConstants.DROP_TARGET_COLOR, 3);
			}
			
			if (this.shape == null)
			{
				this.shape = this.createPreviewShape(this.bounds);
			}
			
			var gridEnabled = graph.isGridEnabledEvent(me.getEvent());
			var hideGuide = true;
			
			if (this.guide != null && this.useGuidesForEvent(me))
			{
				delta = this.guide.move(this.bounds, new mxPoint(dx, dy), gridEnabled);
				hideGuide = false;
				dx = delta.x;
				dy = delta.y;
			}
			else if (gridEnabled)
			{
				var trx = graph.getView().translate;
				var scale = graph.getView().scale;				
				
				var tx = this.bounds.x - (graph.snap(this.bounds.x / scale - trx.x) + trx.x) * scale;
				var ty = this.bounds.y - (graph.snap(this.bounds.y / scale - trx.y) + trx.y) * scale;
				var v = this.snap(new mxPoint(dx, dy));
			
				dx = v.x - tx;
				dy = v.y - ty;
			}
			
			if (this.guide != null && hideGuide)
			{
				this.guide.hide();
			}

			// Constrained movement if shift key is pressed
			if (graph.isConstrainedEvent(me.getEvent()))
			{
				if (Math.abs(dx) > Math.abs(dy))
				{
					dy = 0;
				}
				else
				{
					dx = 0;
				}
			}

			this.currentDx = dx;
			this.currentDy = dy;
			this.updatePreviewShape();

			var target = null;
			var cell = me.getCell();

			var clone = graph.isCloneEvent(me.getEvent()) && graph.isCellsCloneable() && this.isCloneEnabled();
			
			if (graph.isDropEnabled() && this.highlightEnabled)
			{
				// Contains a call to getCellAt to find the cell under the mouse
				target = graph.getDropTarget(this.cells, me.getEvent(), cell, clone);
			}

			var state = graph.getView().getState(target);
			var highlight = false;
			
			if (state != null && (graph.model.getParent(this.cell) != target || clone))
			{
			    if (this.target != target)
			    {
				    this.target = target;
				    this.setHighlightColor(mxConstants.DROP_TARGET_COLOR);
				}
			    
			    highlight = true;
			}
			else
			{
				this.target = null;

				if (this.connectOnDrop && cell != null && this.cells.length == 1 &&
					graph.getModel().isVertex(cell) && graph.isCellConnectable(cell))
				{
					state = graph.getView().getState(cell);
					
					if (state != null)
					{
						var error = graph.getEdgeValidationError(null, this.cell, cell);
						var color = (error == null) ?
							mxConstants.VALID_COLOR :
							mxConstants.INVALID_CONNECT_TARGET_COLOR;
						this.setHighlightColor(color);
						highlight = true;
					}
				}
			}
			
			if (state != null && highlight)
			{
				this.highlight.highlight(state);
			}
			else
			{
				this.highlight.hide();
			}
		}

		this.updateHint(me);
		this.consumeMouseEvent(mxEvent.MOUSE_MOVE, me);
		
		// Cancels the bubbling of events to the container so
		// that the droptarget is not reset due to an mouseMove
		// fired on the container with no associated state.
		mxEvent.consume(me.getEvent());
	}
	else if ((this.isMoveEnabled() || this.isCloneEnabled()) && this.updateCursor &&
		!me.isConsumed() && me.getState() != null && !graph.isMouseDown)
	{
		var cursor = graph.getCursorForMouseEvent(me);
		
		if (cursor == null && graph.isEnabled() && graph.isCellMovable(me.getCell()))
		{
			if (graph.getModel().isEdge(me.getCell()))
			{
				cursor = mxConstants.CURSOR_MOVABLE_EDGE;
			}
			else
			{
				cursor = mxConstants.CURSOR_MOVABLE_VERTEX;
			}
		}

		// Sets the cursor on the original source state under the mouse
		// instead of the event source state which can be the parent
		if (me.sourceState != null)
		{
			me.sourceState.setCursor(cursor);
		}
	}
};