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https://gitee.com/akwkevin/aistudio.-wpf.-diagram
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整理一下项目文件
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艾竹
256
AIStudio.Wpf.DiagramDesigner/Adorners/RubberbandAdorner.cs
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256
AIStudio.Wpf.DiagramDesigner/Adorners/RubberbandAdorner.cs
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using System.Windows;
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using System.Windows.Controls;
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using System.Windows.Documents;
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using System.Windows.Input;
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using System.Windows.Media;
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using System;
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using System.Collections.Generic;
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using System.Linq;
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namespace AIStudio.Wpf.DiagramDesigner
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{
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public class RubberbandAdorner : Adorner
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{
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private Point? startPoint;
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private Point? endPoint;
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private List<Point> pointList = new List<Point>();
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private List<PointDesignerItemViewModel> pointDesignerItemViewModelList = new List<PointDesignerItemViewModel>();
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private Pen rubberbandPen;
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private DesignerCanvas _designerCanvas;
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private IDiagramViewModel _viewModel { get { return _designerCanvas.DataContext as IDiagramViewModel; } }
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private IDiagramServiceProvider _service { get { return DiagramServicesProvider.Instance.Provider; } }
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public RubberbandAdorner(DesignerCanvas designerCanvas, Point? dragStartPoint)
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: base(designerCanvas)
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{
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this._designerCanvas = designerCanvas;
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this.startPoint = dragStartPoint;
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rubberbandPen = new Pen(Brushes.LightSlateGray, 1);
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rubberbandPen.DashStyle = new DashStyle(new double[] { 2 }, 1);
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}
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protected override void OnMouseMove(System.Windows.Input.MouseEventArgs e)
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{
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if (e.LeftButton == MouseButtonState.Pressed)
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{
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if (!this.IsMouseCaptured)
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this.CaptureMouse();
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endPoint = e.GetPosition(this);
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if (this._service.DrawModeViewModel.GetDrawMode() == DrawMode.Polyline)
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{
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if (pointList.Count == 0 && this.startPoint.HasValue)
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{
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pointList.Add(this.startPoint.Value);
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}
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pointList.Add(endPoint.Value);
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}
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UpdateSelection();
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this.InvalidateVisual();
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}
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else if (this._service.DrawModeViewModel.GetDrawMode() == DrawMode.DirectLine)
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{
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if (pointList.Count == 0 && this.startPoint.HasValue)
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{
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pointList.Add(this.startPoint.Value);
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var item = new PointDesignerItemViewModel(startPoint.Value);
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item.ShowConnectors = true;
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_viewModel.DirectAddItemCommand.Execute(item);
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pointDesignerItemViewModelList.Add(item);
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}
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}
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else
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{
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if (this.IsMouseCaptured) this.ReleaseMouseCapture();
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}
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e.Handled = true;
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}
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protected override void OnMouseUp(System.Windows.Input.MouseButtonEventArgs e)
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{
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if (this._service.DrawModeViewModel.GetDrawMode() == DrawMode.DirectLine && e.ChangedButton == MouseButton.Left )
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{
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endPoint = e.GetPosition(this);
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bool isend = false;
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var connector = ControlExtession.TryFindFromPoint<PointConnector>(this._designerCanvas, endPoint.Value);
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if (connector != null)
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{
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if (object.Equals(connector.DataContext, pointDesignerItemViewModelList[0].TopConnector))
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{
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isend = true;
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}
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}
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if (isend == false)
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{
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pointList.Add(endPoint.Value);
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var item = new PointDesignerItemViewModel(endPoint.Value);
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item.ShowConnectors = true;
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_viewModel.DirectAddItemCommand.Execute(item);
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pointDesignerItemViewModelList.Add(item);
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UpdateSelection();
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this.InvalidateVisual();
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return;
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}
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else
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{
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this._service.DrawModeViewModel.SetDrawMode(DrawMode.Polygon);
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}
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}
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// release mouse capture
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if (this.IsMouseCaptured) this.ReleaseMouseCapture();
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// remove this adorner from adorner layer
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AdornerLayer adornerLayer = AdornerLayer.GetAdornerLayer(this._designerCanvas);
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if (adornerLayer != null)
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adornerLayer.Remove(this);
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if (this._service.DrawModeViewModel.GetDrawMode() == DrawMode.Line ||
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this._service.DrawModeViewModel.GetDrawMode() == DrawMode.Rectangle ||
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this._service.DrawModeViewModel.GetDrawMode() == DrawMode.Ellipse ||
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this._service.DrawModeViewModel.GetDrawMode() == DrawMode.Polyline ||
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this._service.DrawModeViewModel.GetDrawMode() == DrawMode.Polygon ||
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this._service.DrawModeViewModel.GetDrawMode() == DrawMode.DirectLine ||
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this._service.DrawModeViewModel.GetDrawMode() == DrawMode.Text)
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{
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if (this.startPoint.HasValue && this.endPoint.HasValue)
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{
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if (this._service.DrawModeViewModel.GetDrawMode() == DrawMode.Polyline
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|| this._service.DrawModeViewModel.GetDrawMode() == DrawMode.Polygon
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|| this._service.DrawModeViewModel.GetDrawMode() == DrawMode.DirectLine)
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{
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ShapeDesignerItemViewModel itemBase = new ShapeDesignerItemViewModel(this._service.DrawModeViewModel.GetDrawMode(), pointList);
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_viewModel.AddItemCommand.Execute(itemBase);
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itemBase.PointDesignerItemViewModels.ForEach(p =>
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{
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p.ParentId = itemBase.Id;
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_viewModel.DirectAddItemCommand.Execute(p);
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});
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}
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else if (this._service.DrawModeViewModel.GetDrawMode() == DrawMode.Text)
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{
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TextDesignerItemViewModel itemBase = new TextDesignerItemViewModel();
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Point position = e.GetPosition(this);
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itemBase.Left = Math.Min(this.startPoint.Value.X, this.endPoint.Value.X);
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itemBase.Top = Math.Min(this.startPoint.Value.Y, this.endPoint.Value.Y);
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itemBase.ItemWidth = Math.Abs(this.endPoint.Value.X - this.startPoint.Value.X);
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itemBase.ItemHeight = Math.Abs(this.endPoint.Value.Y - this.startPoint.Value.Y);
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_viewModel.AddItemCommand.Execute(itemBase);
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}
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else
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{
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ShapeDesignerItemViewModel itemBase = new ShapeDesignerItemViewModel(this._service.DrawModeViewModel.GetDrawMode(), new List<Point> { this.startPoint.Value, this.endPoint.Value });
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_viewModel.AddItemCommand.Execute(itemBase);
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itemBase.PointDesignerItemViewModels.ForEach(p =>
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{
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p.ParentId = itemBase.Id;
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_viewModel.DirectAddItemCommand.Execute(p);
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});
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}
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}
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this._service.DrawModeViewModel.ResetDrawMode();
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}
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pointDesignerItemViewModelList.ForEach(p => _viewModel.DirectRemoveItemCommand.Execute(p));
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e.Handled = true;
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}
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protected override void OnRender(DrawingContext dc)
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{
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base.OnRender(dc);
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// without a background the OnMouseMove event would not be fired !
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// Alternative: implement a Canvas as a child of this adorner, like
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// the ConnectionAdorner does.
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dc.DrawRectangle(Brushes.Transparent, null, new Rect(RenderSize));
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if (this.startPoint.HasValue && this.endPoint.HasValue)
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{
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if (this._service.DrawModeViewModel.GetDrawMode() == DrawMode.Line)
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{
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dc.DrawLine(rubberbandPen, this.startPoint.Value, this.endPoint.Value);
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}
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else if (this._service.DrawModeViewModel.GetDrawMode() == DrawMode.Ellipse)
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{
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var centerPoint = new Point((this.startPoint.Value.X + this.endPoint.Value.X) / 2, (this.startPoint.Value.Y + this.endPoint.Value.Y) / 2);
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dc.DrawEllipse(Brushes.Transparent, rubberbandPen, centerPoint, Math.Abs(this.startPoint.Value.X - this.endPoint.Value.X) / 2, Math.Abs(this.startPoint.Value.Y - this.endPoint.Value.Y) / 2);
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}
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else if (_service.DrawModeViewModel.GetDrawMode() == DrawMode.Polyline)
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{
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var disList = pointList.ToList();
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for (int i = 1; i < pointList.Count; i++)
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{
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dc.DrawLine(rubberbandPen, disList[i - 1], disList[i]);
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}
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}
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else if (_service.DrawModeViewModel.GetDrawMode() == DrawMode.DirectLine)
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{
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var disList = pointList.ToList();
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for (int i = 1; i < pointList.Count; i++)
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{
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dc.DrawLine(rubberbandPen, disList[i - 1], disList[i]);
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}
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}
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else
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{
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dc.DrawRectangle(Brushes.Transparent, rubberbandPen, new Rect(this.startPoint.Value, this.endPoint.Value));
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}
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}
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}
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private T GetParent<T>(Type parentType, DependencyObject dependencyObject) where T : DependencyObject
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{
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DependencyObject parent = VisualTreeHelper.GetParent(dependencyObject);
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if (parent.GetType() == parentType)
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return (T)parent;
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return GetParent<T>(parentType, parent);
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}
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private void UpdateSelection()
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{
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IDiagramViewModel vm = (_designerCanvas.DataContext as IDiagramViewModel);
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Rect rubberBand = new Rect(startPoint.Value, endPoint.Value);
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ItemsControl itemsControl = GetParent<ItemsControl>(typeof(ItemsControl), _designerCanvas);
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foreach (SelectableDesignerItemViewModelBase item in vm.Items)
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{
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if (item is SelectableDesignerItemViewModelBase)
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{
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DependencyObject container = itemsControl.ItemContainerGenerator.ContainerFromItem(item);
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Rect itemRect = VisualTreeHelper.GetDescendantBounds((Visual)container);
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Rect itemBounds = ((Visual)container).TransformToAncestor(_designerCanvas).TransformBounds(itemRect);
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if (rubberBand.Contains(itemBounds))
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{
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//item.IsSelected = true;
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vm.SelectionService.AddToSelection(item);
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}
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else
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{
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if (!(Keyboard.IsKeyDown(Key.LeftCtrl) || Keyboard.IsKeyDown(Key.RightCtrl)))
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{
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//item.IsSelected = false;
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vm.SelectionService.RemoveFromSelection(item);
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}
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}
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}
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}
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}
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}
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}
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