// ========================================
// method
// ========================================
public override void Execute()
{
_commands.Clear();
if (_length == 1)
{
/// 削除する長さが1のとき
int inlineOffset, charIndexInInline;
var inline = _target.GetInlineAt(_index, out charIndexInInline, out inlineOffset);
if (inline.IsLineEndCharacter)
{
var line = inline.Parent as LineSegment;
if (inline is LineBreak)
{
/// line breakならlineをマージ
var nextLine = line.NextSibling as LineSegment;
var cmd = new MergeLineSegmentsCommand(line, nextLine);
cmd.Execute();
_commands.Add(cmd);
}
else if (inline is BlockBreak)
{
/// block breakならblockをマージ
var block = line.Parent as Block;
if (block.HasNextSibling)
{
var nextBlock = block.NextSibling as Block;
var lastLine = block.LineSegments.Last();
var nextFirstLine = nextBlock.LineSegments.First();
var mbcmd = new MergeBlocksCommand(block, nextBlock);
mbcmd.Execute();
_commands.Add(mbcmd);
var mlcmd = new MergeLineSegmentsCommand(lastLine, nextFirstLine);
mlcmd.Execute();
_commands.Add(mlcmd);
}
}
}
else
{
if (inline.Length == 1)
{
var line = inline.Parent as LineSegment;
var cmd = new RemoveInlineFromLineSegmentCommand(line, inline);
cmd.Execute();
_commands.Add(cmd);
}
else
{
var cmd = new RemoveStringFromInlineCommand(inline, charIndexInInline, 1);
cmd.Execute();
_commands.Add(cmd);
}
}
}
else if (_length > 1)
{
var range = new Range(_index, _length);
/// rangeの最初と最後でblockを分ける
var endInline = _target.GetInlineAt(range.End);
var endcmd = new EnsureBlockBreakCommand(_target, range.End + 1);
endcmd.Execute();
_commands.Add(endcmd);
range = endcmd.IsExecuted && !endInline.IsLineEndCharacter?
new Range(_index, _length + 1):
range;
var prevInline = range.Offset > 0? _target.GetInlineAt(range.Offset - 1): null;
var startcmd = new EnsureBlockBreakCommand(_target, range.Offset);
startcmd.Execute();
_commands.Add(startcmd);
range = startcmd.IsExecuted && !prevInline.IsLineEndCharacter?
new Range(range.Offset + 1, range.Length):
range;
/// 範囲内のblockをすべて削除
var removeds = new List <Block>();
foreach (var block in _target.Blocks)
{
var blockRange = _target.GetRange(block);
if (range.Contains(blockRange))
{
removeds.Add(block);
}
}
foreach (var block in removeds)
{
var cmd = new RemoveBlockFromStyledTextCommand(_target, block);
cmd.Execute();
_commands.Add(cmd);
}
/// rangeの最初でblockを分けた場合はmergeしておく
if (startcmd.IsExecuted && !prevInline.IsLineEndCharacter)
{
/// 直前のinlineがLineBreakではなかったならば
/// blockをつないでlineもつなげる
/// (BlockBreakをLineBreakにして，さらにLineBreakを削除)
var block = _target.GetBlockAt(_index);
var nextBlock = block.NextSibling as Block;
var lastLine = block.LineSegments.Last();
var nextFirstLine = nextBlock.LineSegments.First();
var mbcmd = new MergeBlocksCommand(block, nextBlock);
mbcmd.Execute();
_commands.Add(mbcmd);
var mlcmd = new MergeLineSegmentsCommand(lastLine, nextFirstLine);
mlcmd.Execute();
_commands.Add(mlcmd);
}
else if (startcmd.IsExecuted && prevInline.IsLineEndCharacter)
{
/// 直前のinlineがLineBreakだったならば
/// blockをつなぐ
/// (BlockBreakをLineBreakにするだけ)
var block = _target.GetBlockAt(_index - 1);
var nextBlock = block.NextSibling as Block;
var mbcmd = new MergeBlocksCommand(block, nextBlock);
mbcmd.Execute();
_commands.Add(mbcmd);
}
}
}