Class Clipboard

Singleton that implements a clipboard for graph cells.

To copy the selection cells from the graph to the clipboard and paste them into graph2, do the following:

Clipboard.copy(graph);
Clipboard.paste(graph2);
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For fine-grained control of the clipboard data the Graph.canExportCell and Graph.canImportCell functions can be overridden.

To restore previous parents for pasted cells, the implementation for copy and paste can be changed as follows.

Clipboard.copy = function(graph: Graph, cells: Cell[]): void {
  cells = cells ?? graph.getSelectionCells();
  const result = graph.getExportableCells(cells);

  Clipboard.parents = new Object();
  for (let i = 0; i < result.length; i++) {
    Clipboard.parents[i] = graph.model.getParent(cells[i]);
  }

  Clipboard.insertCount = 1;
  Clipboard.setCells(graph.cloneCells(result));

  return result;
};

Clipboard.paste = function(graph: Graph): void {
  if (Clipboard.isEmpty()) {
    return;
  }
  const cells = graph.getImportableCells(Clipboard.getCells());
  const delta = Clipboard.insertCount * Clipboard.STEPSIZE;
  const parent = graph.getDefaultParent();

  graph.model.beginUpdate();
  try {
    for (let i = 0; i < cells.length; i++) {
      const tmp = (Clipboard.parents && graph.model.contains(Clipboard.parents[i])) ?
           Clipboard.parents[i] : parent;
      cells[i] = graph.importCells([cells[i]], delta, delta, tmp)[0];
    }
  }
  finally {
    graph.model.endUpdate();
  }

  // Increments the counter and selects the inserted cells
  Clipboard.insertCount++;
  graph.setSelectionCells(cells);
};
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