void OnGUI () {
if (_gridRenderer == null) _gridRenderer = new GridRenderer();
Event currentEvent = Event.current;
Rect scrollViewRect = new Rect(0, 0, position.width - SidebarWidth, position.height);
Rect sidebarRect = new Rect(position.width - SidebarWidth, 0, SidebarWidth, position.height);
OperatorInspector.DrawInspector(sidebarRect);
ScrollPoint = GUI.BeginScrollView(scrollViewRect, ScrollPoint, Canvas);
bool needsRepaint = false;
// Mouse wheel event to control zoom
if (currentEvent.type == EventType.ScrollWheel) {
float previousZoom = Zoom;
Vector2 pivotPoint = currentEvent.mousePosition / Zoom;
float wheelDelta = Event.current.delta.y > 0 ? -0.1f : 0.1f;
// Apply the delta to the zoom level and clamp to min and max
Zoom = (Zoom + wheelDelta).Clamp(MinZoom, MaxZoom);
Zoom = (float) System.Math.Round(Zoom, 2);
if (previousZoom != Zoom) {
// Keep the viewport anchored to the position of the mouse cursor
float zoomDelta = Zoom - previousZoom;
ScrollPoint += pivotPoint * zoomDelta;
// Repaint if there was a zoom change (after clamping)
needsRepaint = true;
}
currentEvent.Use();
}
Canvas = new Rect(0f, 0f, CanvasWidth * Zoom, CanvasHeight * Zoom);
_gridRenderer.Draw(ScrollPoint, Zoom, Canvas);
if (Template != null) {
// Draw the connections
Template.DrawConnections();
// Draw the nodes
string[] guids = new string[Template.Operators.Count];
Template.Operators.Keys.CopyTo(guids, 0);
for (int i = 0; i < guids.Length; i++) {
Node node = GetNode(guids[i]); // kvp.Key = GUID
needsRepaint = needsRepaint || node.EventsNeedRepaint(Zoom, this);
node.Draw(Zoom);
}
// Handle left mouse button events
if (currentEvent.button == 0) {
// MouseDown
if (currentEvent.type == EventType.MouseDown && CurrentEvent.Type == GEType.None) {
CurrentEvent = new GraphEvent(GEType.Unresolved, GEContext.Grid, null, IOOutlet.None, currentEvent.mousePosition);
}
// MouseDrag
if (currentEvent.type == EventType.MouseDrag && CurrentEvent.IsType(GEType.Unresolved, GEType.Drag) && CurrentEvent.Context == GEContext.Grid) {
if (currentEvent.delta.magnitude > 0) {
CurrentEvent = new GraphEvent(GEType.Drag, GEContext.Grid, null, IOOutlet.None);
ScrollPoint.x += - currentEvent.delta.x;
ScrollPoint.y += - currentEvent.delta.y;
needsRepaint = true;
}
}
// MouseUp
if (currentEvent.type == EventType.MouseUp) {
if (CurrentEvent.Type == GEType.Unresolved && CurrentEvent.Context == GEContext.Grid) {
Selection.Clear();
needsRepaint = true;
}
needsRepaint = needsRepaint || CurrentEvent.IsConnecting();
CurrentEvent.Empty();
}
} // Left mouse down/drag/up
// Right mouse button
if (currentEvent.type == EventType.ContextClick) {
var menu = new GenericMenu();
var opTypes = Operator.GetAvailableOperators();
foreach (var opType in opTypes) {
string menuLabel = opType.Name;
var meta = System.Attribute.GetCustomAttribute(opType, typeof(OperatorMetadataAttribute)) as OperatorMetadataAttribute;
if (meta != null) {
menuLabel = meta.Category + "/" + (meta.Title != null ? meta.Title : opType.Name);
}
var payload = new MenuActionPayload() {OperatorType=opType, Position=currentEvent.mousePosition / Zoom};
menu.AddItem(new GUIContent(menuLabel), false, MenuAction, payload);
}
menu.ShowAsContext();
}
if (currentEvent.isKey && currentEvent.keyCode == KeyCode.Delete) {
foreach (var node in Selection.Nodes) {
Template.RemoveOperator(node.Operator);
}
Selection.Clear();
needsRepaint = true;
}
}
if (needsRepaint) {
Repaint();
}
GUI.EndScrollView();
// Current Zoom level
float zoomLabelWidth = 150f;
float zoomLabelHeight = 20f;
Rect zoomLabelRect = new Rect(position.width - SidebarWidth - zoomLabelWidth - 20f, position.height - zoomLabelHeight - 20f, zoomLabelWidth, zoomLabelHeight);
if (LabelStyle == null) {
LabelStyle = new GUIStyle();
LabelStyle.normal.textColor = Color.white;
LabelStyle.alignment = TextAnchor.LowerRight;
}
GUI.Label(zoomLabelRect, string.Format("Zoom: {0}%", Zoom * 100f), LabelStyle);
} // OnGUI
