private void Canvas_MouseUp(object sender, MouseButtonEventArgs e)
{
if (step != null)
{
var page = strokes_page_all[pagenum];
if (page != null)
{
step.lines_curr.Add(m_canvas.Strokes);
page.lines.Add(step);
step = null;
}
}
}
private void Strokes_StrokesChanged(object sender, StrokeCollectionChangedEventArgs e)
{
if (undoOrRedo > 0)
{
undoOrRedo -= 1;
return;
}
if (step == null)
{
step = new ZBBPageStep();
}
// 笔模式
if (e.Added.Count > 0 && e.Removed.Count == 0)
{
step.lines_add.Add(e.Added);
}
// 橡皮模式 会多次进入回掉
else if (e.Removed.Count > 0)
{
step.lines_add.Add(e.Added);
for (int i = 0; i < e.Removed.Count; i++)
{
var removeItem = e.Removed[i];
if (step.lines_add.Contains(removeItem))
{
step.lines_add.Remove(removeItem);
}
else
{
step.lines_remove.Add(removeItem);
}
}
}
}