public DeleteMultilineTextCommand(
BlockCollection blocks,
BlockPosition startPosition,
BlockPosition stopPosition)
: base(true, false)
{
// Save the variables so we can set the position.
this.startPosition = startPosition;
this.stopPosition = stopPosition;
// If we are in the same line, we have a modified command.
if (startPosition.BlockKey == stopPosition.BlockKey)
{
// We have a single-line delete.
var singleDeleteCommand = new DeleteTextCommand(
startPosition, stopPosition.TextIndex);
Commands.Add(singleDeleteCommand);
return;
}
// Start by removing the text to the right of the first line.
var deleteTextCommand = new DeleteTextCommand(
startPosition, CharacterPosition.End);
Commands.Add(deleteTextCommand);
// Copy the final line text, from beginning to position, into the first
// line. This will merge the top and bottom lines.
var insertTextCommand = new InsertTextFromBlock(
startPosition,
stopPosition.BlockKey,
stopPosition.TextIndex,
CharacterPosition.End);
Commands.Add(insertTextCommand);
// Once we have a merged line, then just delete the remaining lines.
// Figure out line ranges we'll be deleting text from.
removedBlocks = new List <Block>();
Block startBlock = blocks[startPosition.BlockKey];
Block stopBlock = blocks[stopPosition.BlockKey];
int startIndex = blocks.IndexOf(startBlock);
int stopIndex = blocks.IndexOf(stopBlock);
// Go through the remaining lines.
for (int i = startIndex + 1;
i <= stopIndex;
i++)
{
// Get the block we're removing and add it to the list.
Block removeBlock = blocks[i];
removedBlocks.Add(removeBlock);
// Add in a command to remove the block.
var deleteBlockCommand = new DeleteBlockCommand(removeBlock.BlockKey);
Commands.Add(deleteBlockCommand);
}
}