Code Explainer | VBA

Excel VBA TextBox Events Overview

This guide explains various event procedures associated with a TextBox in Excel VBA. It covers events like BeforeDragOver, Change, and GotFocus, detailing their purposes, parameters, and sample code to enhance interactivity in Excel forms.

Prompt

Private Sub TextBox1_BeforeDragOver(ByVal Cancel As MSForms.ReturnBoolean, ByVal Data As MSForms.DataObject, ByVal X As Single, ByVal Y As Single, ByVal DragState As MSForms.fmDragState, ByVal Effect As MSForms.ReturnEffect, ByVal Shift As Integer)

End Sub

Private Sub TextBox1_BeforeDropOrPaste(ByVal Cancel As MSForms.ReturnBoolean, ByVal Action As MSForms.fmAction, ByVal Data As MSForms.DataObject, ByVal X As Single, ByVal Y As Single, ByVal Effect As MSForms.ReturnEffect, ByVal Shift As Integer)

End Sub


Private Sub TextBox1_Change()

Application.ScreenUpdating = False
ActiveSheet.ListObjects("inventory_tbl").Range.AutoFilter field:=1, Criteria1:="*" & [D7] & "*", Operator:=xlFilterValues
Application.ScreenUpdating = True

End Sub

Private Sub TextBox1_DblClick(ByVal Cancel As MSForms.ReturnBoolean)

End Sub

Private Sub TextBox1_DropButtonClick()

End Sub

Private Sub TextBox1_Error(ByVal Number As Integer, ByVal Description As MSForms.ReturnString, ByVal SCode As Long, ByVal Source As String, ByVal HelpFile As String, ByVal HelpContext As Long, ByVal CancelDisplay As MSForms.ReturnBoolean)

End Sub

Private Sub TextBox1_GotFocus()

End Sub

Private Sub TextBox1_KeyDown(ByVal KeyCode As MSForms.ReturnInteger, ByVal Shift As Integer)

End Sub

Private Sub TextBox1_KeyPress(ByVal KeyAscii As MSForms.ReturnInteger)

End Sub

Private Sub TextBox1_KeyUp(ByVal KeyCode As MSForms.ReturnInteger, ByVal Shift As Integer)

End Sub

Private Sub TextBox1_LostFocus()

End Sub

Private Sub TextBox1_MouseDown(ByVal Button As Integer, ByVal Shift As Integer, ByVal X As Single, ByVal Y As Single)

End Sub

Private Sub TextBox1_MouseMove(ByVal Button As Integer, ByVal Shift As Integer, ByVal X As Single, ByVal Y As Single)

End Sub

Private Sub TextBox1_MouseUp(ByVal Button As Integer, ByVal Shift As Integer, ByVal X As Single, ByVal Y As Single)

End Sub

Private Sub Worksheet_SelectionChange(ByVal Target As Range)
Application.ScreenUpdating = True
End Sub

Answer

Code Explanation of Excel VBA TextBox Events

The provided code snippet is written in Visual Basic for Applications (VBA), specifically designed for use in Excel forms. This code includes various event procedures associated with a TextBox control named TextBox1, as well as a worksheet event. Here is a breakdown of each part.

Overview of Event Procedures

TextBox1_BeforeDragOver
- Purpose: This subroutine is triggered before an object is dragged over the TextBox. It can be used to set actions or conditions during the drag.
- Parameters:
  - Cancel: Indicates if the drag operation should be canceled.
  - Data: Represents the data being dragged.
  - X, Y: Coordinates of the mouse pointer.
  - DragState: Current state of the drag operation.
  - Effect: Describes the effect of the drag-and-drop operation.
  - Shift: Information about the state of the keyboard modifier keys.
TextBox1_BeforeDropOrPaste
- Purpose: This event is triggered before data is dropped or pasted into the TextBox.
- Parameters:
  - Cancel: Can be set to cancel the action.
  - Action: Specifies whether the action is a paste or drop.
  - Data, X, Y, Effect, Shift: Similar to the previous subroutine, these parameters provide contextual information about the action.
TextBox1_Change
- Purpose: Triggered whenever the text in the TextBox changes.
- Functionality: It disables screen updating for performance benefits while applying a filter to a table named inventory_tbl based on the contents of cell D7. The filter conditions match any records that contain text similar to what is in the TextBox.
Code Snippet:
```
Application.ScreenUpdating = False
ActiveSheet.ListObjects("inventory_tbl").Range.AutoFilter field:=1, Criteria1:="*" & [D7] & "*", Operator:=xlFilterValues
Application.ScreenUpdating = True
```
TextBox1_DblClick
- Purpose: Placeholder for actions when the TextBox is double-clicked. Currently not implemented.
TextBox1_DropButtonClick
- Purpose: Placeholder for actions invoked when the drop button of the TextBox is clicked. Currently not implemented.
TextBox1_Error
- Purpose: Placeholder for handling errors that occur within the TextBox. Currently not implemented.
TextBox1_GotFocus
- Purpose: Placeholder that executes logic when the TextBox gains focus (e.g., user clicks on it). Currently not implemented.
TextBox1_KeyDown
- Purpose: Placeholder for code that runs when a key is pressed down while focused on the TextBox. Currently not implemented.
TextBox1_KeyPress
- Purpose: Placeholder for code that runs when a key is pressed while the TextBox is focused. Currently not implemented.
TextBox1_KeyUp
- Purpose: Placeholder that executes code when a key is released after being pressed in the TextBox. Currently not implemented.
TextBox1_LostFocus
- Purpose: Placeholder for actions triggered when the TextBox loses focus (e.g., user clicks outside the TextBox). Currently not implemented.
TextBox1_MouseDown
- Purpose: Placeholder for handling mouse down events within the TextBox. Currently not implemented.
TextBox1_MouseMove
- Purpose: Placeholder for handling mouse move events within the TextBox. Currently not implemented.
TextBox1_MouseUp
- Purpose: Placeholder for handling mouse button releases in the TextBox. Currently not implemented.
Worksheet_SelectionChange
- Purpose: This event occurs when the selection changes in the worksheet. It has a parameter Target – the range that was selected.
- Functionality: Although it is marked as setting ScreenUpdating to true, this is redundant since it does not change it to false elsewhere.

Key Concepts Explained

Event Procedures: These are special subroutines that respond to specific events occurring in a user interface element (like a TextBox). They allow programmers to define custom actions based on user interactions.
Parameters Usage: The above event procedures receive specific parameters that give the subroutine context about what triggered the event. This allows conditioned responses based on the user's actions.
Screen Updating: The Application.ScreenUpdating property is often used to enhance performance by preventing screen flickering during the execution of code that updates the Excel UI.

Additional Example

Here is an additional example demonstrating how to utilize an event to change the color of the TextBox when it gains focus:

Private Sub TextBox1_GotFocus()
    TextBox1.BackColor = RGB(255, 255, 0) ' Change background to yellow when focused
End Sub

This example highlights the capability of the GotFocus event to alter the user interface dynamically based on user actions.

Conclusion

In summary, the provided code illustrates various event procedures associated with a TextBox in an Excel VBA environment. It effectively uses event-driven programming, allowing for interactive user experiences through customizable responses to user actions. Understanding these events is crucial for developing responsive VBA applications in Excel. For those looking to delve deeper into such topics, courses available on the Enterprise DNA Platform can be beneficial.