The PickFirstSelectionSet Property in Word

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The PickFirstSelectionSet Property
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AutoCAD allows users to select entities in either a verb-noun or a noun-verb manner. A verbnoun selection is one in which a command is issued first, followed by a selection of entities to work with. A noun-verb selection is one in which entities are selected first and then a command that uses them is issued. One of the benefits of noun-verb selection is that by performing only one selection, you can run multiple independent commands in sequence on the same set of entities without having to explicitly use the Previous option. The selection of entities built by the user when AutoCAD is idle at the command prompt is called the PickFirst selection set. This selection set is available via the read-only PickfirstSelectionSet property of each drawing object. A special SelectionSet named PICKFIRST is created by AutoCAD whenever the property is accessed. If the user does not preselect any entities, this selection set will be empty. Set SelectionSetObject = DocumentObject.PickfirstSelectionSet
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The SelectionChanged Event
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By using the SelectionChanged event of each Document object, you can receive notification every time the user adds entities to or removes entities from the PickFirst selection set. This event is fired any time the PickFirst selection set is altered. 4 discusses events in more detail. To demonstrate that the SelectionChanged event is triggered, the following example, which you should place in the ThisDrawing module, tells the user how many objects are in the PickFirst selection set and then changes the highlight of the PickFirst selection set after a half second. Private Sub AcadDocument_SelectionChanged() Dim objSS As AcadSelectionSet Dim dblStart As Double '' get the pickfirst selection from drawing Set objSS = ThisDrawing.PickfirstSelectionSet
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CHAPTER 12 SELECTION SETS AND GROUPS
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'' highlight the selected entities objSS.Highlight True MsgBox "There are " & objSS.Count & " objects in selection set: " & objSS.Name '' delay for 1/2 second dblStart = Timer Do While Timer < dblStart + 0.5 Loop '' unhighlight the selected entities objSS.Highlight False End Sub
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Groups
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AutoCAD allows you to have a more permanent form of selection set called a group. Just like SelectionSet objects, Group objects associate an arbitrary set of entities into a collection that you can use all at once in many operations. You can associate entities with any number of groups, and you can have any number of entities in a single group. By default, when an entity that belongs to a group is selected, all the other members of the group are automatically selected as well. The behavior is controlled by the PICKSTYLE system variable. See the AutoCAD User s Guide for details on other possible values for this variable. Despite being collected into a group, entities that make up a group are still easily editable on an individual basis. This is in contrast to blocks in which, once entities are collected into a Block Definition and then inserted, the entities are quite difficult to edit individually. However, it s interesting to note that Group objects can have Xdata attached to them, and they have available nearly all the same default properties that other entities have, such as Color, Linetype, Lineweight, PlotStyle, Visible, and even TrueColor. You normally create and edit groups through the Object Grouping dialog box (see Figure 12-2), which you can view by typing GROUP at the AutoCAD command prompt.
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CHAPTER 12 SELECTION SETS AND GROUPS
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Adding a Group Object
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Just like with selection sets, you use the Add method of the collection to create a new Group object as detailed in Table 12-10. Set GroupObject = GroupsCollection.Add(Name) Table 12-10. The Add Method Parameter
Name
Name
Data Type
String
Description
The name of the newly created group
If you try to add a Group object with a name that is already being used, this method will return a reference to the existing object. The following example attempts to add a group using a name obtained from the user: Public Sub TestAddGroup() Dim objGroup As AcadGroup Dim strName As String On Error Resume Next '' get a name from user strName = InputBox("Enter a new group name: ") If "" = strName Then Exit Sub Set objGroup = ThisDrawing.Groups.Item(strName) '' create it If Not objGroup Is Nothing Then MsgBox "Group already exists" Exit Sub End If Set objGroup = ThisDrawing.Groups.Add(strName) '' check if it was created If objGroup Is Nothing Then MsgBox "Unable to Add '" & strName & "'" Else MsgBox "Added group '" & objGroup.Name & "'" End If End Sub
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