How to implement Visual Studio read-only file in WinForms Editor?
Keydown event
VS.NET unlike most of other editors allows editing of read-only files. It only prompts the user during the save operation that the file is read-only and the read-only attribute needs to be overridden in order to save the changes. Based on the user input, the changes are either lost or the read-only attribute is overridden, and the changes are saved. By default, the EditControl does not allow editing of read-only files. All keystrokes are simply ignored when a read-only file is loaded into the EditControl.
The VS.NET like behavior can be implemented in the EditControl by handling its KeyDown event as shown in the code snippets below.
C#
private void editControl1_KeyDown(object sender, System.Windows.Forms.KeyEventArgs e)
{
if ((e.Control == true) || (e.Alt == true))
{
// Do nothing
}
else
{
// Check if its a ReadOnly file
if ((File.GetAttributes(filePath) & FileAttributes.ReadOnly) != 0)
{
string message = "Do you wish to override the read-only attribute and perform modifications ?";
string caption = "ReadOnly file opened - unable to make modifications";
MessageBoxButtons buttons = MessageBoxButtons.YesNo;
DialogResult result = MessageBox.Show(this, message, caption, buttons);
if (result == DialogResult.Yes)
{
FileInfo fileInfo = new FileInfo(filePath);
fileInfo.Attributes -= FileAttributes.ReadOnly;
this.editControl1.Close();
this.editControl1.LoadFile(filePath);
}
else if (result == DialogResult.No)
{
// Do nothing
}
}
}
}
VB
Private Sub editControl1_KeyDown(sender As Object, e As System.Windows.Forms.KeyEventArgs) Handles editControl1.KeyDown If e.Control = True OrElse e.Alt = True Then ' Do nothing Else ' Check if its a ReadOnly file If(File.GetAttributes(filePath) And FileAttributes.ReadOnly) <> 0 Then Dim message As String = "Do you wish to override the read-only attribute and perform modifications ?" Dim caption As String = "ReadOnly file opened - unable to make modifications" Dim buttons As MessageBoxButtons = MessageBoxButtons.YesNo Dim result As DialogResult = MessageBox.Show(Me, message, caption, buttons) If result = DialogResult.Yes Then Dim fileInfo As New FileInfo(filePath) fileInfo.Attributes -= FileAttributes.ReadOnly Me.editControl1.Close() Me.editControl1.LoadFile(filePath) ElseIf result = DialogResult.No Then ' Do nothing End If End If End If End Sub 'editControl1_KeyDown
Conclusion
I hope you enjoyed learning about how to implement Visual Studio like read-only file handling behavior in WinForms SyntaxEditor (EditControl).
You can
refer to our WinForms Editor feature tour
page
to know about its other groundbreaking feature representations and documentation, and
how to quickly get started for configuration specifications. You can also
explore our WinForms Editor example to
understand how to create and manipulate data.
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