n WinForms Controls in Detail in Visual Basic .NET

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9 n WinForms Controls in Detail
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Private Sub mnuModesLowercase_Click( _ ByVal sender As SystemObject, _ ByVal e As SystemEventArgs) _ Handles mnuModesLowercaseClick 'Sets the TextBox's character case to lower txtEditorCharacterCasing = CharacterCasingLower mnuModesNormalChecked = False mnuModesUppercaseChecked = False mnuModesLowercaseChecked = True End Sub End Class Listing 913: Event-handler code for the Text Editor form
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The purpose and operation of most of the code in Listing 913 should be quite clear Interactions with the clipboard are a little awkward because the Windows clipboard can accommodate a range of data types (Text, RichText, Bitmaps, HTML, Colour Pallets, Audio data and a number of custom formats), and can hold a number of these types of data simultaneously To pick up data from the clipboard, we rst have to ask whether it has any data of a suitable format (in this case DataFormatsText) and then call the GetDataObject() method specifying the data format we want We can use this to our advantage by managing the menu so that it shows only commands that are valid to use If there is no text in the clipboard, there is no point in making the Paste command available Similarly, if no text in the text box has been selected, there will be nothing to copy or paste The text box s CanUndo() method tells us whether there is any typing for us to undo We can combine all of these checks, placing them in the PopUp event-handler of the top-level menu item, and enabling or disabling menu items as appropriate The only other tricky code here is that for the Find command By using static variables to store the text we wish to nd (FindText) and the last location where text was found (Pos), we can use the InStr() function to step through every occurrence of text we are seeking in the editor Initially, Pos is 0, and we start looking in the text box at character number Pos + 1 Subsequently, Pos will contain the last location that the text was found at, and adding 1 to this will give us the next place to start looking The menu item code for the Modes menu takes a slightly different approach Here, the text box is set up as appropriate by each menu item and the corresponding menu items are Checked Disappointingly, a menu item with a RadioCheck setting does not operate as a group with other menu items, so it is necessary to check one item on and the others off in code (bad marks to Microsoft for this)
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942 CheckBoxes and RadioButtons
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Although these controls are similar, they are used for different purposes A CheckBox is a single control that works alone to allow the user to indicate the True/False, On/Off, 1/0 setting for an item with a Boolean value For example,
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we could use a check box to allow the user to indicate that they wanted a bank account that pays interest monthly instead of annually (see Figure 95) A check box used in this way allows a user to answer yes or no to a question with minimum effort At the same time, the result can be determined unambiguously in code For example, the check box setting in the above can be collected from the Checked property using the code in Listing 914
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Private Sub btnOK_Click(ByVal sender As SystemObject, _ ByVal e As SystemEventArgs) _ Handles btnOKClick Dim A As BankAccount() If radCurrentChecked Then A = New CurrentAccount() ElseIf radDepositChecked Then A = New DepositAccount() ElseIf radInvestmentChecked Then A = New InvestmentAccount() End If AAccountName = txtNameText AInterestMonthly = chkMonthlyInterestValue AccountListAdd(A) MeClose() End Sub Listing 914: Collecting the Checked property of a CheckBox control
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9 n WinForms Controls in Detail RadioButtons are used in a different way, even though each RadioButton has a Checked property that takes on a Boolean value As their name suggests, RadioButtons are normally used in a group, where only one member of the group
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can be checked at any one time, in much the same way as preset stations are selected on a radio set (as you select a station by pressing a button, the button that is currently depressed pops up) If a different member of a group of radio buttons is checked, either by the user clicking on it, or by setting its Checked property to True in code, the Checked state of the member that was previously True will automatically go to False One apparent problem with groups of RadioButton controls arises if you need to have two or more independent groups of buttons on a form If all of the buttons for each group are added to a single form, they will in fact be one large group, of which only one button can be checked To get around this problem, it is necessary to place each group in a different Container control A Panel, GroupBox or PictureBox can all be Container controls, although the obvious one to use is the GroupBox, as shown in Figure 95 A GroupBox has the added advantage that you can use its Text property to give each group a caption (like Type of Account in Figure 95) Note that, unlike a MenuItem with the RadioCheck set to True, there is no need to write code to turn check marks on and off in RadioButton controls The normal user action of clicking on a member of a RadioButton group will turn the checks of the whole group on and off as appropriate
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