Selection, clipboard & context menu

Selecting

Selection works the way you'd expect from any editor. Click to select, hold Ctrl to add or remove from the selection, drag a box with Shift held to marquee-select, and Ctrl+A to grab everything. Esc or a click on empty space clears it.

The same operations are available from code, which is useful when you're building toolbars or reacting to what's selected:

diagram.SelectModel(node, unselectOthers: true);
diagram.SelectAll();
diagram.UnselectAll();

foreach (var model in diagram.GetSelectedModels())
{
    // ...
}

Clipboard

Copy, cut, paste, and duplicate act on the selected nodes — links between them aren't carried along, only the nodes themselves. Each is on the usual shortcut and also exposed on the canvas:

Action	Shortcut	Method
Copy	Ctrl+C	canvas.CopySelection()
Cut	Ctrl+X	canvas.CutSelection()
Paste	Ctrl+V	canvas.PasteClipboard()
Duplicate	Ctrl+D	canvas.DuplicateSelection()

Pasting and duplicating drop the copies at a small offset, select just the new copies, and count as a single undo. The copies are made with NodeModel.Clone(), so if your node carries extra data, override Clone to bring it along — see Custom nodes.

Z-order

canvas.BringSelectionToFront();
canvas.SendSelectionToBack();
// or one model at a time:
diagram.SendToFront(model);
diagram.SendToBack(model);

Calling the canvas methods records the order change in the normal undo stack.

Groups

diagram.Options.Groups.Enabled = true;

canvas.GroupSelection();
canvas.UngroupSelection();
canvas.ToggleGroupingSelection(); // group if possible, otherwise ungroup

The canvas methods leave child nodes on the diagram and record the group edit as one undo step.

The right-click menu

Right-clicking the canvas opens a menu with Delete, Duplicate, Group, Ungroup, Bring to front, Send to back, Select all, and Zoom to fit. If you right-click a model that isn't selected, it gets selected first, so the menu always acts on whatever you clicked.

Read-only mode

Set canvas.IsReadOnly = true to turn the canvas into an inspector. People can still pan, zoom, and select — so it's genuinely browsable — but moving, connecting, deleting, and the clipboard are all switched off.