Function domToBlockInternal

packages/blockly/core/xml.ts:632–688

(
  xmlBlock: Element,
  workspace: Workspace,
)

 * @internal
 */
export function domToBlockInternal(
  xmlBlock: Element,
  workspace: Workspace,
): Block {
  // Create top-level block.
  eventUtils.disable();
  const variablesBeforeCreation = workspace.getVariableMap().getAllVariables();
  let topBlock;
  try {
    topBlock = domToBlockHeadless(xmlBlock, workspace);
    // Generate list of all blocks.
    if (workspace.rendered) {
      const topBlockSvg = topBlock as BlockSvg;
      const blocks = topBlock.getDescendants(false);
      topBlockSvg.setConnectionTracking(false);
      // Render each block.
      for (let i = blocks.length - 1; i >= 0; i--) {
        (blocks[i] as BlockSvg).initSvg();
      }
      for (let i = blocks.length - 1; i >= 0; i--) {
        (blocks[i] as BlockSvg).queueRender();
      }
      // Populating the connection database may be deferred until after the
      // blocks have rendered.
      setTimeout(function () {
        if (!topBlockSvg.disposed) {
          topBlockSvg.setConnectionTracking(true);
        }
      }, 1);
      // Allow the scrollbars to resize and move based on the new contents.
      // TODO(@picklesrus): #387. Remove when domToBlock avoids resizing.
      (workspace as WorkspaceSvg).resizeContents();
    } else {
      const blocks = topBlock.getDescendants(false);
      for (let i = blocks.length - 1; i >= 0; i--) {
        blocks[i].initModel();
      }
    }
  } finally {
    eventUtils.enable();
  }
  if (eventUtils.isEnabled()) {
    const newVariables = Variables.getAddedVariables(
      workspace,
      variablesBeforeCreation,
    );
    // Fire a VarCreate event for each (if any) new variable created.
    for (let i = 0; i < newVariables.length; i++) {
      const thisVariable = newVariables[i];
      eventUtils.fire(new (eventUtils.get(EventType.VAR_CREATE))(thisVariable));
    }
    // Block events come after var events, in case they refer to newly created
    // variables.
    eventUtils.fire(new (eventUtils.get(EventType.BLOCK_CREATE))(topBlock));
  }
  return topBlock;
}