prevent resizing on moving painting object

Pilz.UI/PaintingControl/PaintingControl.vb

@@ -24,7 +24,6 @@ Public Class PaintingControl
 
     Public Property Offset As PointF = PointF.Empty
     Public ReadOnly Property PaintingObjects As New PaintingObjectList(Me)
-    'Public Property EnableRealTransparency As Boolean = False
     Public Property VisibleForMouseEvents As Boolean = True
     Public Property AutoAreaSelection As Boolean = True
     Public Property AutoSingleSelection As Boolean = True
@@ -50,9 +49,6 @@ Public Class PaintingControl
     Private pressedControl As Boolean = False
     Private pressedAlt As Boolean = False
 
-    'Friend WithEvents HScrollBarAdv1 As DevComponents.DotNetBar.ScrollBar.HScrollBarAdv
-    'Friend WithEvents VScrollBarAdv1 As DevComponents.DotNetBar.VScrollBarAdv
-
     Private savedPos As New Dictionary(Of PaintingObject, PointF)
 
     Public Event SelectionChanged(sender As Object, e As PaintingObjectEventArgs)
@@ -118,10 +114,21 @@ Public Class PaintingControl
     End Property
 
     Public Sub New()
-        'SetStyle(ControlStyles.Opaque, True) 'For real transparency
+        AddHandler PaintingObjectResizing.CheckEnabled, AddressOf PaintingObjectResizing_CheckEnabled
         DoubleBuffered = True
     End Sub
 
+    Protected Overrides Sub Finalize()
+        RemoveHandler PaintingObjectResizing.CheckEnabled, AddressOf PaintingObjectResizing_CheckEnabled
+        MyBase.Finalize()
+    End Sub
+
+    Private Sub PaintingObjectResizing_CheckEnabled(sender As PaintingObjectResizing, ByRef enabled As Boolean)
+        If PaintingObjects.Contains(sender.PaintingObject) AndAlso pressedAlt Then
+            enabled = False
+        End If
+    End Sub
+
     Private Sub ResetAllBufferedImages()
         For Each ob As PaintingObject In PaintingObjects
             ob.ResetImageBuffer()
@@ -129,7 +136,7 @@ Public Class PaintingControl
         Refresh()
     End Sub
 
-    Private Sub CheckKeyDown(sender As Object, e As KeyEventArgs) Handles Me.KeyDown, Me.KeyUp
+    Protected Sub CheckKeyDown(sender As Object, e As KeyEventArgs) Handles Me.KeyDown, Me.KeyUp
         pressedShift = e.Shift
         pressedControl = e.Control
         pressedAlt = e.Alt
@@ -141,7 +148,7 @@ Public Class PaintingControl
         End Get
     End Property
 
-    Private Sub CheckMouseClick(sender As Object, e As MouseEventArgs) Handles Me.MouseClick
+    Protected Sub CheckMouseClick(sender As Object, e As MouseEventArgs) Handles Me.MouseClick
         For Each obj As PaintingObject In GetObjects(New Point(e.X + Offset.X, e.Y + Offset.Y))
             If Not obj.MouseTransparency Then
                 obj.RaiseMouseClick(GetMouseEventArgs(e, obj))
@@ -149,7 +156,7 @@ Public Class PaintingControl
         Next
     End Sub
 
-    Private Sub CheckMouseDown(sender As Object, e As MouseEventArgs) Handles Me.MouseDown
+    Protected Sub CheckMouseDown(sender As Object, e As MouseEventArgs) Handles Me.MouseDown
         lastMousePos = New Point(e.X + Offset.X, e.Y + Offset.Y)
 
         curObjMouseDown = GetObjects(lastMousePos).Where(Function(n) Not n.MouseTransparency).LastOrDefault
@@ -225,7 +232,7 @@ Public Class PaintingControl
     Public Sub RaiseSelectionChanged()
         RaiseEvent SelectionChanged(Me, New PaintingObjectEventArgs(SelectedObjects))
     End Sub
-    Private Sub CheckMouseUp(sender As Object, e As MouseEventArgs) Handles Me.MouseUp
+    Protected Sub CheckMouseUp(sender As Object, e As MouseEventArgs) Handles Me.MouseUp
         If _IsAreaSelecting Then
             _IsAreaSelecting = False
         End If
@@ -252,7 +259,7 @@ Public Class PaintingControl
             RaiseEvent AfterScrollingDone(Me, New EventArgs)
         End If
     End Sub
-    Private Sub CheckMouseMove(sender As Object, e As MouseEventArgs) Handles Me.MouseMove
+    Protected Sub CheckMouseMove(sender As Object, e As MouseEventArgs) Handles Me.MouseMove
         If _IsAreaSelecting OrElse _IsMovingObjects Then
             lastMousePos = New Point(e.X + Offset.X, e.Y + Offset.Y)
         End If
@@ -648,6 +655,8 @@ Public Class PaintingControl
             Dim val As Single = e.Delta / 120 / 10
             ZoomFactor = New SizeF(Math.Max(ZoomFactor.Width + val, 0.25), Math.Max(ZoomFactor.Height + val, 0.25))
             Refresh()
+        Else
+            '...
         End If
     End Sub
 

Pilz.UI/PaintingControl/PaintingObjectResizing.vb

@@ -1,10 +1,15 @@
 Imports System.Drawing
+Imports System.Runtime.CompilerServices
 Imports System.Windows.Forms
+
 Imports Newtonsoft.Json
+
 Imports Pilz.Drawing
 
 <Serializable> Friend Class PaintingObjectResizing
 
+    Public Shared Event CheckEnabled(sender As PaintingObjectResizing, ByRef enabled As Boolean)
+
     Private WithEvents mObj As PaintingObject
     Private WithEvents mObjParent As Control = Nothing
     Private WithEvents mObjControl As Control = Nothing
@@ -35,13 +40,23 @@ Imports Pilz.Drawing
         End Get
     End Property
 
+    Public ReadOnly Property PaintingObject As PaintingObject
+        Get
+            Return mObj
+        End Get
+    End Property
+
     Public Sub New(obj As PaintingObject)
         mObj = obj
         mObjControl = mObj.Parent
     End Sub
 
-    Shared Function ApplyToControl(obj As PaintingObject) As PaintingObjectResizing
-        Return New PaintingObjectResizing(obj)
+    Private Function IsEnabled() As Boolean
+        Dim enabled = Me.Enabled
+
+        RaiseEvent CheckEnabled(Me, enabled)
+
+        Return enabled
     End Function
 
     Private Sub mControl_MouseDown(sender As Object, e As MouseEventArgs) Handles mObj.MouseDown
@@ -115,7 +130,7 @@ Imports Pilz.Drawing
             Dim setToNone As Boolean = False
             Dim isOnTop As Boolean = mObj.Parent.GetObject(New PointF(realX, realY), True) Is mObj
 
-            If Enabled AndAlso isOnTop Then
+            If IsEnabled() AndAlso isOnTop Then
                 Select Case True
                     Case HelpfulDrawingFunctions.IsPointInRectangle(eLocation, New Rectangle(newRect.X, newRect.Y, newRect.Width, newRect.Height))
                         mObj.Cursor = Cursors.SizeNWSE