The Netron Project For vb.net

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

 

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