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The code in this chapter runs from the Macros dialog box. To work from a UserForm, you need to modify each sample. For example, change code from this: Public Sub TestUserInput() Dim strInput As String With ThisDrawing.Utility .InitializeUserInput 1, "Line Arc Circle laSt" strInput = .GetKeyword(vbCr & "Option [Line/Arc/Circle/laSt]: ") .Prompt "You selected '" & strInput & "'" End With End Sub to this: Private Sub CommandButton1_Click() Dim strInput As String Me.Hide With ThisDrawing.Utility .InitializeUserInput 1, "Line Arc Circle laSt" strInput = .GetKeyword(vbCr & "Option [Line/Arc/Circle/laSt]: ") MsgBox "You selected '" & strInput & "'" End With Me.Show End Sub Programs written using the full version of Visual Basic 6 or VBA 6.3 (AutoCAD 2002 and later) are not limited to modal dialog forms. But sometimes it may make sense to hide the form while interacting with the user at the AutoCAD command prompt. Try to think like your users when you design the interaction process and your forms behavior.
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CHAPTER 7 USER INTERACTION AND THE UTILITY OBJECT
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The Prompt Method
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The Prompt method displays messages on the AutoCAD command line. It returns nothing. UtilityObject.Prompt Message The Message parameter is a string that contains the message to display at the command prompt.
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Note Remember to include carriage returns or linefeeds in the message string, or your message will just
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be appended to whatever text is on the command prompt.
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The following code displays a simple message at the command prompt, as shown in Figure 7-1: Public Sub TestPrompt() ThisDrawing.Utility.Prompt vbCrLf & "This is a simple message" End Sub
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Figure 7-1. Displaying a message at the command prompt The remaining examples in this chapter extensively use the Prompt method to give the user feedback.
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The InitializeUserInput Method
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The InitializeUserInput method establishes which keywords the program will accept during command line input. It also sets input criteria such as whether null values are allowed. It affects the very next call to an input function, after which the keywords and other input criteria are cleared. The InitializeUserInput method has this syntax: UtilityObject.InitializeUserInput OptionBits[, KeywordList] Table 7-1 explains this method s parameters. Table 7-1. The InitializeUserInput Method s Parameters
Name
OptionBits KeywordList
Type
Long String
Description
Restricts what the user can input, as Table 7-2 explains Displays a list of the keywords delimited by spaces
CHAPTER 7 USER INTERACTION AND THE UTILITY OBJECT
Table 7-2 explains valid OptionBits options. Table 7-2. The Acceptable Keyword List Values
Bit Value
0 or not set 1 2 4 8
Description
No control conditions are applied. Prevents null input such as pressing Enter or entering a space. Prevents the user from entering a zero value. Prevents the user from entering a negative value. Lets the user enter a point outside the current drawing limits. AutoCAD won t check the drawing limits even if the LIMCHECK system variable is on. LIMCHECK controls whether entities may be created outside the drawing limits. Not currently used. For methods that allow input via the graphics screen, AutoCAD uses a dashed rather than solid line when it displays a rubber-band line or box. AutoCAD ignores this bit if the POPUPS system variable is set to zero. POPUPS indicates whether the currently configured display driver supports dialog boxes, the menu bar, and icon menus. For the GetDistance method, ignores the Z-coordinate of 3-D points, thus returning a 2-D distance. Accepts any user input.
16 32
64 128
Keywords
Command line keywords give the user various options. For instance, if you use the AutoCAD Draw toolbar s rectangle command, you may either pick a point or use one of the five keywords to choose another command: Specify first corner point or [Chamfer/Elevation/Fillet/Thickness/Width]: The KeywordList parameter specifies a set of keywords available at the input prompt. It is a string that contains the keywords, each separated by a space. The capital letter in each keyword is the shortcut key the user can type. It is common practice to give the user a list of valid keywords when prompting for input. You must supply this list in your input prompt, since AutoCAD does not indicate the active keywords in any other way. This example demonstrates these ideas by getting a keyword from the user and then printing it on the command line: Public Sub TestUserInput() Dim strInput As String With ThisDrawing.Utility .InitializeUserInput 1, "Line Arc Circle laSt" strInput = .GetKeyword(vbCr & "Option [Line/Arc/Circle/laSt]: ") .Prompt vbCr & "You selected '" & strInput & "'" End With End Sub
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