n WinForms Controls in Detail in VB.NET

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Table 94
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Settings required for the form and controls of the Text Editor
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Property Name Multiline AcceptsReturn AcceptsEnter Dock Name Text Name Text ShortCut Name Text ShortCut Name Text ShortCut Name Text ShortCut Name Text ShortCut Name Text ShortCut Name Text RadioCheck ShortCut Name Text RadioCheck Name Text RadioCheck Name Text Name Text
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Setting txtEditor True True True Fill mnuEdit &Edit mnuEditCopy &Copy CtrlC mnuEditCut C&ut CtrlX mnuEditPaste &Paste CtrlV mnuEditUndo &Undo CtrlU mnuEditFind &Find CtrlF mnuModes &Modes CtrlM mnuModesNormal &Normal True CtrlN mnuModesUpperCase Upper Case True mnuModesLowerCase LowerCase True mnuModesSep1 - (hyphen makes a separator bar) mnuModesScrollbars Scroll Bars
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94 Simple Input Controls
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A Text Editor form with a MainMenu
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Although the TextChanged event seems to be the only speci cally useful event de ned for a TextBox, the generic KeyPress, KeyUp and KeyDown events are ideal for controlling user input We can demonstrate a number of TextBox features by building a simple text editor Figure 94 shows a suitably designed form containing a TextBox and a MainMenu The settings for the form and controls are shown in Table 94, and Listing 913 shows the code necessary to provide full edit control Note that some menu items in the above table do not have shortcuts or accelerator keys It is normal to provide these only for items that are frequently used
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Public Class frmTextEdit Inherits SystemWindowsFormsForm + Windows Form Designer generated code
Private Sub mnuEdit_Popup(ByVal sender As Object, _ ByVal e As SystemEventArgs) _ Handles mnuEditPopup 'This event occurs immediately before the menu appears 'It is ideal for setting up the availability of 'menu items If txtEditorSelectedText <> "" Then 'There is text selected, so mnuEditCutEnabled = True mnuEditCopyEnabled = True Else 'There is no text selected mnuEditCutEnabled = False mnuEditCopyEnabled = False End If If ClipboardGetDataObjectGetDataPresent( _ (DataFormatsText) Then
9 n WinForms Controls in Detail
'There is text in the clipboard, so mnuEditPasteEnabled = True Else 'No text in the clipboard mnuEditPasteEnabled = False End If If txtEditorCanUndo Then 'Provide an undo option mnuEditUndoEnabled = True Else 'No point in an undo option mnuEditUndoEnabled = False End If End Sub Private Sub mnuEditCopy_Click(ByVal sender As SystemObject, _ ByVal e As SystemEventArgs) _ Handles mnuEditCopyClick 'Copy selected text to the clipboard ClipboardSetDataObject(txtEditorSelectedText) End Sub Private Sub mnuEditCut_Click(ByVal sender As SystemObject, _ ByVal e As SystemEventArgs) _ Handles mnuEditCutClick 'Copy selected text to the clipboard ClipboardSetDataObject(txtEditorSelectedText) 'and then remove the selected text txtEditorSelectedText = "" End Sub Private Sub mnuEditPaste_Click(ByVal sender As SystemObject, _ ByVal e As SystemEventArgs) _ Handles mnuEditPasteClick 'Paste clipboard contents as the selected text txtEditorSelectedText = _ ClipboardGetDataObjectGetData(DataFormatsText) End Sub Private Sub mnuEditUndo_Click(ByVal sender As SystemObject, _ ByVal e As SystemEventArgs) _ Handles mnuEditUndoClick 'Perform an undo operation txtEditorUndo() End Sub Private Sub mnuEditFind_Click(ByVal sender As SystemObject, _ ByVal e As SystemEventArgs) _ Handles mnuEditFindClick 'Locate text in the editor Static pos As Integer Static FindText As String 'First ask for text to find (previous entry is default)
94 Simple Input Controls
FindText = InputBox("Enter text to find", _ "Find Text", FindText) 'Check something was entered If FindText <> "" Then 'Try to find it, starting where we left off pos = InStr(pos + 1, txtEditorText, FindText) 'Did we find it If pos = 0 Then 'No let the user know MessageBoxShow("Not Found") Else 'Yes move the cursor to it and select it txtEditorSelect(pos 1, FindTextLength) txtEditorScrollToCaret() End If End If End Sub Private Sub mnuModesScrollbars_Click( _ ByVal sender As SystemObject, _ ByVal e As SystemEventArgs) _ Handles mnuModesScrollbarsClick 'Sets scroll bars on or off in the textbox If mnuModesScrollbarsChecked Then mnuModesScrollbarsChecked = False txtEditorScrollBars = ScrollBarsNone Else mnuModesScrollbarsChecked = True txtEditorScrollBars = ScrollBarsBoth End If End Sub Private Sub mnuModesNormal_Click(ByVal sender As SystemObject, _ ByVal e As SystemEventArgs) _ Handles mnuModesNormalClick 'Sets the TextBox's character case to normal (mixed) txtEditorCharacterCasing = CharacterCasingNormal mnuModesNormalChecked = True mnuModesUppercaseChecked = False mnuModesLowercaseChecked = False End Sub Private Sub mnuModesUppercase_Click( _ ByVal sender As SystemObject, _ ByVal e As SystemEventArgs) _ Handles mnuModesUppercaseClick 'Sets the TextBox's character case to UPPER txtEditorCharacterCasing = CharacterCasingUpper mnuModesNormalChecked = False mnuModesUppercaseChecked = True mnuModesLowercaseChecked = False End Sub