The Netron Project For vb.net
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Netron是一个用于实现类似简单Visio图形化功能的C#开源项目，作者在2006年停止了2.5版的更新，随后在2007年发布了3.0版。网络上也出现了基于2.5版的轻量版，相对来说简单很多，虽然可以用来入门学习，但被阉割过的项目总显得有些无味。3.0版相对2.5版来说是质的飞跃，但的的确确确确实实实实在在太“重量”了，所以研究学习2.5版是最折中的选择。 我已经把原版的C#源码转换成VB.net，这样对VBFans来说也许是件令人鼓舞的事情。除了语言上的转换之外，还对项目中原有的bug和不足做了如下的小范围修改。 (魏滔序原创，转帖请注明出处。) DiagramControl：删除选中的项目 添加方法： Public Sub RemoveSelectedItems() For i As Int32 = SelectedItems.Count - 1 To 0 Step -1 Controller.Model.Remove(SelectedItems(i)) Next Me.Invalidate() End Sub
Selecttion：执行DiagramControl.SelectedItems.Clear时反选 Private Shared Sub RaiSEOnNewSelection() RemoveHandler mSelection.OnClear,AddressOf OnShowTracker RemoveHandler mSelection.OnItemRemoved,AddressOf OnShowTracker AddHandler mSelection.OnClear,AddressOf OnShowTracker AddHandler mSelection.OnItemRemoved,AddressOf OnShowTracker RaiseEvent OnNewSelection(Nothing,EventArgs.Empty) End Sub
Private Shared Sub OnShowTracker(ByVal sender As Object,ByVal e As EventArgs) Controller.View.ShowTracker() End Sub
CollectionBase：从索引移除项目时触发OnItemRemoved事件 Public Sub RemoveAt(ByVal index As Integer) Dim Item As T = Me.innerList(index) Me.innerList.RemoveAt(index) RaiSEOnItemRemoved(Item) End Sub
Connection：禁止连线缩放(去除缩放点和选中矩形框) Public Sub New(ByVal mFrom As Point,ByVal mTo As Point,ByVal model As IModel) MyBase.New(model) MyBase.Resizable = False Me.From = New Connector(mFrom,model) Me.From.Name = "From" Me.From.Parent = Me Me.To = New Connector(mTo,model) Me.To.Name = "To" Me.To.Parent = Me End Sub
View：Resizable = False 时去除获得焦点的选中矩形框 Public Shared Function GetTracker(ByVal rectangle As Rectangle,ByVal type As TrackerTypes,ByVal showHandles As Boolean) As ITracker Select Case type Case TrackerTypes.Default If defTracker Is Nothing Then defTracker = New DefaultTracker() End If If showHandles Then defTracker.Transform(rectangle) Else defTracker.Transform(Nothing) End If defTracker.ShowHandles = showHandles Return defTracker Case Else Return Nothing End Select End Function
TransformTool：实现鼠标移动时自动变换指针图标 在 Public Sub MouseMove(ByVal e As MouseEventArgs) Implements IMouseListener.MouseMove 的过程中添加： If e.Button = MouseButtons.None AndAlso Enabled AndAlso (Not IsSuspended) Then If Selection.SelectedItems.Count > 0 Then Dim gripPoint As Point = Me.Controller.View.Tracker.Hit(e.Location) Dim c As Cursor = Nothing Select Case gripPoint.X Case -1 Select Case gripPoint.Y Case -1 c = Cursors.SizeNWSE Case 0 c = Cursors.SizeWE Case 1 c = Cursors.SizeNESW End Select Case 0 Select Case gripPoint.Y Case -1 c = Cursors.SizeNS Case 1 c = Cursors.SizeNS End Select Case 1 Select Case gripPoint.Y Case -1 c = Cursors.SizeNESW Case 0 c = Cursors.SizeWE Case 1 c = Cursors.SizeNWSE End Select End Select Controller.View.CurrentCursor = c End If End If
TransformTool：缩放图形完成时刷新视图 Public Sub MouseUp(ByVal e As MouseEventArgs) Implements IMouseListener.MouseUp If IsActive Then DeactivateTool() Dim cmd As New TransformCommand(Me.Controller,origin,scalex,scaley,transformers) Me.Controller.UndoManager.AddUndoCommand(cmd) Me.Controller.View.Invalidate() End If End Sub
ShapeBase：限制图形的最小高度和宽度为10像素 Public Overridable Sub Transform(ByVal x As Integer,ByVal y As Integer,ByVal width As Integer,ByVal height As Integer) Implements IShape.Transform Dim a,b As Double Dim p As Point If width <= 10 Or height <= 10 Then Exit Sub For Each cn As IConnector In Me.mConnectors a = Math.Round((CDbl(cn.Point.X) - CDbl(mRectangle.X)) / CDbl(mRectangle.Width),1) * width + x - cn.Point.X b = Math.Round((CDbl(cn.Point.Y) - CDbl(mRectangle.Y)) / CDbl(mRectangle.Height),1) * height + y - cn.Point.Y p = New Point(Convert.ToInt32(a),Convert.ToInt32(b)) cn.Move(p) Next cn mRectangle = New Rectangle(x,y,width,height) End Sub 下载 其他版本请自行搜索 （编辑：李大同） 【声明】本站内容均来自网络，其相关言论仅代表作者个人观点，不代表本站立场。若无意侵犯到您的权利，请及时与联系站长删除相关内容! |