Created
February 28, 2024 07:43
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OxyPlot drag&drop + create on double click
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| public class SelectedDataPointViewModel | |
| { | |
| private readonly LineSeries _series; | |
| public DataPoint StartDataPoint { get; private set; } | |
| public DataPoint CurrentDataPoint => _series.Points[SelectedDataPointIndex]; | |
| public int SelectedDataPointIndex { get; set; } | |
| public bool IsDragging { get; set; } | |
| public float InitiationDistance { get; set; } | |
| public SelectedDataPointViewModel(LineSeries series) | |
| { | |
| _series = series; | |
| _series.PlotModel.MouseDown += OnMouseDown; | |
| _series.PlotModel.MouseMove += OnMouseMove; | |
| _series.PlotModel.MouseUp += OnMouseUp; | |
| _series.PlotModel.MouseLeave += OnMouseLeave; | |
| InitiationDistance = 0.02f; | |
| } | |
| private void OnMouseLeave(object? sender, OxyMouseEventArgs e) | |
| { | |
| if (IsDragging) | |
| { | |
| EndDrag(); | |
| e.Handled = true; | |
| } | |
| } | |
| private void OnMouseUp(object? sender, OxyMouseEventArgs e) | |
| { | |
| if (IsDragging) | |
| { | |
| EndDrag(); | |
| e.Handled = true; | |
| } | |
| } | |
| private void OnMouseMove(object? sender, OxyMouseEventArgs e) | |
| { | |
| if (IsDragging) | |
| { | |
| var tmp = _series.Points[SelectedDataPointIndex]; | |
| _series.Points.RemoveAt(SelectedDataPointIndex); | |
| _series.Points.Insert(SelectedDataPointIndex, | |
| Axis.InverseTransform(e.Position, _series.XAxis, _series.YAxis)); ; | |
| _series.PlotModel.InvalidatePlot(true); | |
| e.Handled = true; | |
| } | |
| } | |
| private void OnMouseDown(object? sender, OxyMouseDownEventArgs e) | |
| { | |
| if (e.HitTestResult?.Item != null && e.HitTestResult.Item is DataPoint) | |
| { | |
| var dataPointOffset = e.HitTestResult.Index; | |
| var dragAndDropIndex = (int)Math.Round(dataPointOffset); | |
| var isWithinInitiationDistance = Math.Abs(dataPointOffset - dragAndDropIndex) <= InitiationDistance; | |
| var isDragAndDropInitiated = isWithinInitiationDistance && e.ClickCount == 1; | |
| var isCreateInitiated = e.ClickCount > 1; | |
| if (isDragAndDropInitiated) | |
| { | |
| StartDrag(dragAndDropIndex); | |
| e.Handled = true; | |
| } | |
| else if (isCreateInitiated) | |
| { | |
| var insertIndex = (int)Math.Ceiling(dataPointOffset); | |
| CreatePoint(insertIndex, Axis.InverseTransform(e.Position, _series.XAxis, _series.YAxis)); | |
| e.Handled = true; | |
| } | |
| } | |
| } | |
| private void CreatePoint(int insertIndex, DataPoint point) | |
| { | |
| IsDragging = false; | |
| StartDataPoint = point; | |
| SelectedDataPointIndex = insertIndex; | |
| _series.Points.Insert(insertIndex, point); | |
| _series.PlotModel.InvalidatePlot(true); | |
| } | |
| private void EndDrag() | |
| { | |
| IsDragging = false; | |
| } | |
| private void StartDrag(int dataPointIndex) | |
| { | |
| StartDataPoint = _series.Points[dataPointIndex]; | |
| SelectedDataPointIndex = dataPointIndex; | |
| IsDragging = true; | |
| } | |
| } |
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