/// <summary>
/// 在本次编辑栈内,取消<paramref name="trimEditDrawObjectCell"/>的更改内容;
/// </summary>
/// <param name="trimEditDrawObjectCell"></param>
private void UnApplyTrimCell(TrimEditDrawObjectCell trimEditDrawObjectCell)
{
if (trimEditDrawObjectCell == null)
{
throw new ArgumentNullException(nameof(trimEditDrawObjectCell));
}
foreach (var replacedOriginDrawObject in trimEditDrawObjectCell.ReplacedOriginDrawObjects)
{
replacedOriginDrawObject.IsVisible = true;
}
_createdDrawObjects.AddRange(trimEditDrawObjectCell.ReplacedCreatedDrawObjects);
_createdDrawObjects.RemoveItems(trimEditDrawObjectCell.NewCreatedDrawObjects);
_originReplacedDrawObjects.RemoveItems(trimEditDrawObjectCell.ReplacedOriginDrawObjects);
RaiseVisualChanged();
}
/// <summary>
/// 在拖放操作按下时,尝试进行裁剪操作;
/// </summary>
/// <param name="canvasContext"></param>
/// <param name="e"></param>
private void OnDragSelect(object sender, DragSelectEventArgs e)
{
if (e == null)
{
throw new ArgumentNullException(nameof(e));
}
//若Control键被按下,中止处理,指示外部可以进行拖放选中;
if ((CanvasContext.InputDevice.KeyBoard.ModifierKeys & ModifierKeys.Control) == ModifierKeys.Control)
{
return;
}
///<see cref="ICanvasContextEx"/> 中被选中的绘制对象和
///<see cref="_createdDrawObjects"/>中被选中的绘制对象为裁剪标准;
var originTrimingDrawObjects = CanvasContext.GetAllVisibleDrawObjects().Where(p => p.IsSelected);
var createdTrimingDrawObjects = _createdDrawObjects.Where(p => p.IsSelected);
var trimingDrawObjects = originTrimingDrawObjects.Union(createdTrimingDrawObjects).ToArray();
///下为原件以及<see cref="_createdDrawObjects"/>中将被裁剪的绘制对象;
///作为裁剪标准的绘制对象不能被裁剪;
var drawObjectsToBeTrimedFromOrigin = e.HitedDrawObjects.
Where(p => p.IsVisible).
Where(p => !trimingDrawObjects.Contains(p));
var drawObjectsToBeTrimedFromCreated = _createdDrawObjects.
Where(p => p.ObjectInRectangle(e.Rectangle2D, CanvasContext.CanvasProxy, true)).
Where(p => !trimingDrawObjects.Contains(p));
var newCreatedDrawObjects = new List <DrawObject>();
var replacedOriginDrawObjects = new List <DrawObject>();
var replacedCreatedDrawObjects = new List <DrawObject>();
///对原件中被框选的绘制对象进行裁剪处理;
foreach (var drawObjectToBeTrimedFromOrigin in drawObjectsToBeTrimedFromOrigin)
{
var trimedDrawObjects = GetTrimedOrExtendedDrawObjects(drawObjectToBeTrimedFromOrigin, trimingDrawObjects, e.Rectangle2D);
//若trimedDrawObjects为空,则裁剪未能完成;
if (trimedDrawObjects == null)
{
continue;
}
newCreatedDrawObjects.AddRange(trimedDrawObjects);
replacedOriginDrawObjects.Add(drawObjectToBeTrimedFromOrigin);
}
///对<see cref="_createdDrawObjects"/>中框选的绘制对象进行裁剪处理;
foreach (var drawObjectToBeTrimedFromCreated in drawObjectsToBeTrimedFromCreated)
{
var trimedDrawObjects = GetTrimedOrExtendedDrawObjects(drawObjectToBeTrimedFromCreated, trimingDrawObjects, e.Rectangle2D);
//若trimedDrawObjects为空,则裁剪未能完成;
if (trimedDrawObjects == null)
{
continue;
}
newCreatedDrawObjects.AddRange(trimedDrawObjects);
replacedCreatedDrawObjects.Add(drawObjectToBeTrimedFromCreated);
}
if (newCreatedDrawObjects.Count != 0)
{
var trimCell = new TrimEditDrawObjectCell {
NewCreatedDrawObjects = newCreatedDrawObjects.ToArray(),
ReplacedCreatedDrawObjects = replacedCreatedDrawObjects.ToArray(),
ReplacedOriginDrawObjects = replacedOriginDrawObjects.ToArray()
};
ApplyTrimCell(trimCell);
_undoTrimEditDrawObjectCells.Push(trimCell);
RaiseCanUndoRedoChanged();
}
//指示已处理;
e.Cancel = true;
}
