public void Draw(GraphRendererContext rendererContext, GraphCamera camera)
{
if (!active)
{
return;
}
var mouseWorld = camera.ScreenToWorld(mouseScreenPosition);
mousePin.Position = mouseWorld;
GraphLinkRenderer.DrawGraphLink(rendererContext, link, camera);
// Check the pin that comes under the mouse pin
var targetPin = graphEditor.GetPinUnderPosition(mouseWorld);
if (targetPin != null)
{
var sourcePin = attachedPin;
var pins = new GraphPin[] { sourcePin, targetPin };
Array.Sort(pins, new GraphPinHierarchyComparer());
string errorMessage;
if (!GraphSchema.CanCreateLink(pins[0], pins[1], out errorMessage))
{
GraphTooltip.message = errorMessage;
}
}
}
/// <summary>
/// Handles user input (keyboard and mouse)
/// </summary>
/// <param name="e">Input event</param>
/// <param name="camera">Graph camera to convert to / from screen to world coordinates</param>
/// <returns>true if the input was processed, false otherwise.</returns>
public static bool HandleNodeInput(GraphNode node, Event e, GraphCamera camera)
{
bool inputProcessed = false;
if (!node.Dragging)
{
// let the pins handle the input first
foreach (var pin in node.InputPins)
{
if (inputProcessed)
{
break;
}
inputProcessed |= HandlePinInput(pin, e, camera);
}
foreach (var pin in node.OutputPins)
{
if (inputProcessed)
{
break;
}
inputProcessed |= HandlePinInput(pin, e, camera);
}
}
var mousePosition = e.mousePosition;
var mousePositionWorld = camera.ScreenToWorld(mousePosition);
int dragButton = 0;
// If the pins didn't already handle the input, then let the node handle it
if (!inputProcessed)
{
bool insideRect = node.Bounds.Contains(mousePositionWorld);
if (e.type == EventType.MouseDown && insideRect && e.button == dragButton)
{
node.Dragging = true;
inputProcessed = true;
}
else if (e.type == EventType.MouseUp && insideRect && e.button == dragButton)
{
node.Dragging = false;
}
}
if (node.Dragging && !node.Selected)
{
node.Dragging = false;
}
if (node.Dragging && e.type == EventType.MouseDrag)
{
inputProcessed = true;
}
return(inputProcessed);
}
/// <summary>
/// Handles the mouse input and returns true if handled
/// </summary>
public static bool HandlePinInput(GraphPin pin, Event e, GraphCamera camera)
{
var mousePosition = e.mousePosition;
var mousePositionWorld = camera.ScreenToWorld(mousePosition);
int buttonIdDrag = 0;
int buttonIdDestroyLinks = 1;
if (pin.ContainsPoint(mousePositionWorld))
{
if (e.type == EventType.MouseDown && e.button == buttonIdDrag)
{
pin.ClickState = GraphPinMouseState.Clicked;
return(true);
}
if (e.button == buttonIdDestroyLinks)
{
if (e.type == EventType.MouseDown)
{
pin.RequestLinkDeletionInitiated = true;
}
else if (e.type == EventType.MouseDrag)
{
pin.RequestLinkDeletionInitiated = false;
}
else if (e.type == EventType.MouseUp)
{
if (pin.RequestLinkDeletionInitiated)
{
DestroyPinLinks(pin);
if (pin.Node != null && pin.Node.Graph != null)
{
pin.Node.Graph.NotifyStateChanged();
}
}
}
return(true);
}
if (pin.ClickState != GraphPinMouseState.Clicked)
{
pin.ClickState = GraphPinMouseState.Hover;
}
}
else
{
pin.ClickState = GraphPinMouseState.None;
}
return(false);
}
void HandleSelect(Event e)
{
// Update the node selected flag
var mousePosition = e.mousePosition;
var mousePositionWorld = camera.ScreenToWorld(mousePosition);
var buttonId = 0;
if (e.type == EventType.MouseDown && e.button == buttonId)
{
bool multiSelect = keyboardState.ShiftPressed;
bool toggleSelect = keyboardState.ControlPressed;
// sort the nodes front to back
GraphNode[] sortedNodes = graph.Nodes.ToArray();
System.Array.Sort(sortedNodes, new NodeReversedZIndexComparer());
GraphNode mouseOverNode = null;
foreach (var node in sortedNodes)
{
var mouseOver = node.Bounds.Contains(mousePositionWorld);
if (mouseOver)
{
mouseOverNode = node;
break;
}
}
foreach (var node in sortedNodes)
{
var mouseOver = (node == mouseOverNode);
if (mouseOverNode != null && mouseOverNode.Selected && !toggleSelect)
{
multiSelect = true; // select multi-select so that we can drag multiple objects
}
if (multiSelect || toggleSelect)
{
if (mouseOver && multiSelect)
{
node.Selected = true;
}
else if (mouseOver && toggleSelect)
{
node.Selected = !node.Selected;
}
}
else
{
node.Selected = mouseOver;
}
if (node.Selected)
{
BringToFront(node);
}
}
if (mouseOverNode == null)
{
// No nodes were selected
Selection.activeObject = null;
}
OnNodeSelectionChanged();
}
}