private void buttonClear_Click(object sender, RoutedEventArgs e)
{
geos.Clear(); // REM 清除所有的笔划
ptinfos.Clear(); // REM 清除一笔中所有点
CreateNewBitmap();
strokes.Clear(); // REM 清除所有的画笔
tiwp.Clear(); // REM 清除控件中的选择
}
private void SetNewHost(string host, string nextAnswer, MessageType mt)
{
Application.Current.Dispatcher.InvokeAsync(() => Strokes.Clear());
if (host == UserName)
{
IsHost = true;
}
else
{
IsHost = false;
}
if (IsHost && IsInGame)
{
CurrentAnswer = nextAnswer;
}
else
{
string blank = "";
for (int i = 0; i < nextAnswer.Length; i++)
{
blank += "□";
}
CurrentAnswer = blank;
}
}
/// <summary>
/// Redo image edits that were undone
/// </summary>
internal void Redo()
{
int index = redoActions.Count - 1;
if (index < 0)
{
return;
}
if (redoActions[index] == InkCanvasEditingMode.Ink)
{
Strokes.Add(redoStrokes[index]);
}
else if (redoActions[index] == InkCanvasEditingMode.EraseByStroke)
{
Strokes.RemoveAt(Strokes.Count - 1);
}
else if (redoActions[index] == InkCanvasEditingMode.None)
{
Strokes.Clear();
}
undoActions.Add(redoActions[index]);
undoStrokes.Add(redoStrokes[index]);
redoActions.RemoveAt(index);
redoStrokes.RemoveAt(index);
}
private void ClearCanvas()
{
Application.Current.Dispatcher.Invoke(new Action(() =>
{
ABBManager.Instance.ShapesPending.Enqueue(new ObjectToDraw(EraseAll: true, Colour: Colors.White));
Strokes.Clear();
}));
}
internal void EraseAll()
{
Strokes.Clear();
undoActions.Add(InkCanvasEditingMode.None);
undoStrokes.Add(null);
redoActions.Clear();
redoStrokes.Clear();
}
internal void Clear()
{
Strokes.Clear();
redoActions.Clear();
redoStrokes.Clear();
undoActions.Clear();
undoStrokes.Clear();
}
public void Clear()
{
Strokes.Clear();
canvas.DrawColor(BackgroundColor != null ? new Color((byte)(BackgroundColor.R * 255.0), (byte)(BackgroundColor.G * 255.0), (byte)(BackgroundColor.B * 255.0), (byte)(BackgroundColor.A * 255.0)) : Color.Transparent, PorterDuff.Mode.Clear);
if (backgroundBitmap != null)
{
DrawStrokes();
}
Invalidate();
}
private void UpdateStrokes()
{
App.Current.Dispatcher.Invoke(() =>
{
// Do we need a lock here?
IsRefreshingStrokes = true;
var newStrokes = new StrokeCollection(StrokeCollection.GetMergedStrokeMaps());
Strokes.Clear();
Strokes.Add(newStrokes);
if (EditingMode == InkCanvasEditingMode.Select)
{
SelectionChanged?.Invoke(SelectedStrokes);
}
IsRefreshingStrokes = false;
});
}
/// <summary>
/// Undo edit actions performed
/// </summary>
internal void Undo()
{
int index = undoActions.Count - 1;
if (index < 0)
{
return;
}
if (undoActions[index] == InkCanvasEditingMode.Ink)
{
Strokes.RemoveAt(Strokes.Count - 1);
}
else if (undoActions[index] == InkCanvasEditingMode.EraseByStroke)
{
Strokes.Add(undoStrokes[index]);
}
else if (undoActions[index] == InkCanvasEditingMode.None)
{
for (int i = 0; i < index; i++)
{
if (undoActions[i] == InkCanvasEditingMode.Ink)
{
Strokes.Add(undoStrokes[i]);
}
else if (undoActions[i] == InkCanvasEditingMode.EraseByStroke)
{
Strokes.Remove(undoStrokes[i]);
}
else if (undoActions[i] == InkCanvasEditingMode.None)
{
Strokes.Clear();
}
}
}
redoActions.Add(undoActions[index]);
redoStrokes.Add(undoStrokes[index]);
undoActions.RemoveAt(index);
undoStrokes.RemoveAt(index);
}
protected override void OnElementChanged(ElementChangedEventArgs <DrawingView> e)
{
base.OnElementChanged(e);
if (Control == null && Element != null)
{
canvas = new InkCanvas
{
Background = Element.BackgroundColor.ToBrush(),
DefaultDrawingAttributes = new()
{
Color = Element.DefaultLineColor.ToMediaColor(),
Width = Element.DefaultLineWidth,
Height = Element.DefaultLineWidth
}
};
Element.Lines.CollectionChanged += OnCollectionChanged;
SetNativeControl(canvas);
canvas.Strokes.StrokesChanged += OnStrokesChanged;
Control !.PreviewMouseDown += OnPreviewMouseDown;
}
if (e.OldElement != null)
{
canvas !.Strokes.StrokesChanged -= OnStrokesChanged;
Element !.Lines.CollectionChanged -= OnCollectionChanged;
if (Control != null)
{
Control.PreviewMouseDown -= OnPreviewMouseDown;
}
}
}
void OnCollectionChanged(object sender, NotifyCollectionChangedEventArgs args)
{
canvas !.Strokes.StrokesChanged -= OnStrokesChanged;
canvas.Strokes.Clear();
LoadLines();
canvas.Strokes.StrokesChanged += OnStrokesChanged;
}
void OnPreviewMouseDown(object sender, MouseButtonEventArgs e) => Clear();
void Clear(bool force = false)
{
if (!Element.MultiLineMode || force)
{
canvas !.Strokes.Clear();
Element.Lines.Clear();
}
}
void OnStrokesChanged(object sender, StrokeCollectionChangedEventArgs e)
{
Element.Lines.CollectionChanged -= OnCollectionChanged;
if (e.Added.Count > 0)
{
if (!Element.MultiLineMode)
{
Element.Lines.Clear();
}
var lines = Element.MultiLineMode ? e.Added : new StrokeCollection()
{
e.Added.First()
};
foreach (var line in lines)
{
var points = line.StylusPoints.Select(point => new Point(point.X, point.Y)).ToList();
Element.Lines.Add(new Line()
{
Points = new ObservableCollection <Point>(points),
LineColor = Color.FromRgba(line.DrawingAttributes.Color.R, line.DrawingAttributes.Color.G,
line.DrawingAttributes.Color.B, line.DrawingAttributes.Color.A),
LineWidth = (float)line.DrawingAttributes.Width
});
}
if (Element.Lines.Count > 0)
{
var lastLine = Element.Lines.Last();
if (Element.DrawingLineCompletedCommand?.CanExecute(lastLine) ?? false)
{
Element.DrawingLineCompletedCommand.Execute(lastLine);
}
}
if (Element.ClearOnFinish)
{
Element.Lines.CollectionChanged -= OnCollectionChanged;
Clear(true);
canvas !.Strokes.StrokesChanged += OnStrokesChanged;
}
}
Element.Lines.CollectionChanged += OnCollectionChanged;
}
void LoadLines()
{
var lines = Element.MultiLineMode
? Element.Lines
: Element.Lines.Any()
? new ObservableCollection <Line> {
Element.Lines.LastOrDefault()
}
: new ObservableCollection <Line>();
foreach (var line in lines)
{
var stylusPoints = line.Points.Select(point => new StylusPoint(point.X, point.Y)).ToList();
if (stylusPoints is { Count: > 0 })
{
var stroke = new Stroke(new StylusPointCollection(stylusPoints))
{
DrawingAttributes = new()
{
Color = line.LineColor.ToMediaColor(),
Width = line.LineWidth,
Height = line.LineWidth
}
};
canvas !.Strokes.Add(stroke);
}
}
}
void OnPreviewMouseDown(object sender, MouseButtonEventArgs e)
{
canvas !.Strokes.Clear();
Element.Points.Clear();
}
public void Clear()
{
Strokes.Clear();
CurrentPathView.Clear();
drawPath();
}
/// <summary>
/// Clears all strokes added with <see cref="AddStroke(TouchStroke)"/>.
/// </summary>
public void ClearStrokes()
{
EnsureNotDisposed();
_strokes.Clear();
}
void TouchCanvas_Gesture(object sender, InkCanvasGestureEventArgs e)
{
GestureRecognitionResult recognitionResult = e.GetGestureRecognitionResults().FirstOrDefault();
if (recognitionResult != null && recognitionResult.RecognitionConfidence == RecognitionConfidence.Strong && recognitionResult.ApplicationGesture == ApplicationGesture.ScratchOut)
Strokes.Clear();
}
public virtual void Clear()
{
Strokes.Clear();
undo = 0;
}
private void ClearCanvas(object param)
{
Strokes.Clear();
}