RichEditControl.AutoCorrect Event

Fires when text is typed in the control.

Namespace: DevExpress.Xpf.RichEdit

Assembly: DevExpress.Xpf.RichEdit.v21.2.dll

NuGet Package: DevExpress.Wpf.RichEdit

Declaration

C#

public event AutoCorrectEventHandler AutoCorrect

VB.NET

Public Event AutoCorrect As AutoCorrectEventHandler

Event Data

The AutoCorrect event's data class is AutoCorrectEventArgs. The following properties provide information specific to this event:

Property	Description
AutoCorrectInfo	Gets or sets the AutoCorrectInfo object that provides methods to analyze input text and contains a replacement object.

The event data class exposes the following methods:

Method	Description
CreateAutoCorrectInfo()	Allows you to create a new AutoCorrectInfo instance for use within the event handler.

Remarks

Handle the AutoCorrect event to implement complex replacements as you type.

The RichEditControl.AutoCorrect event is handled to replace the typed $ symbol with a picture of a dollar, and substitute the text enclosed in percent symbols with custom content.

To accomplish this task, a document text obtained via the AutoCorrectEventArgs.AutoCorrectInfo property is amended by expanding its left boundary using the AutoCorrectInfo.DecrementStartPosition method, until a special symbol or a word separator symbol is found. If a resulting string meets certain conditions, such as whether it is a dollar sign or a %date% string, a replacement object is passed to the document via the AutoCorrectInfo.ReplaceWith property. A replacement object can be a string or an image.

View Example

MainWindow.xaml.vb

Private Sub richEditControl1_AutoCorrect(ByVal sender As Object, ByVal e As DevExpress.XtraRichEdit.AutoCorrectEventArgs)
    Dim info As AutoCorrectInfo = e.AutoCorrectInfo
    e.AutoCorrectInfo = Nothing

    If info.Text.Length <= 0 Then
        Return
    End If
    Do
        If Not info.DecrementStartPosition() Then
            Return
        End If

        If IsSeparator(info.Text(0)) Then
            Return
        End If

        If info.Text(0) = "$"c Then
            info.ReplaceWith = CreateImageFromResx("dollar_pic.png")
            e.AutoCorrectInfo = info
            Return
        End If

        If info.Text(0) = "%"c Then
            Dim replaceString As String = CalculateFunction(info.Text)
            If Not String.IsNullOrEmpty(replaceString) Then
                info.ReplaceWith = replaceString
                e.AutoCorrectInfo = info
            End If
            Return
        End If
    Loop
End Sub

MainWindow.xaml.cs

private void richEditControl1_AutoCorrect(object sender, DevExpress.XtraRichEdit.AutoCorrectEventArgs e)
{
    AutoCorrectInfo info = e.AutoCorrectInfo;
    e.AutoCorrectInfo = null;

    if (info.Text.Length <= 0)
        return;
    for (; ; ) {
        if (!info.DecrementStartPosition())
            return;

        if (IsSeparator(info.Text[0]))
            return;

        if (info.Text[0] == '$') {
            info.ReplaceWith = CreateImageFromResx("dollar_pic.png");
            e.AutoCorrectInfo = info;
            return;
        }

        if (info.Text[0] == '%') {
            string replaceString = CalculateFunction(info.Text);
            if (!String.IsNullOrEmpty(replaceString)) {
                info.ReplaceWith = replaceString;
                e.AutoCorrectInfo = info;
            }
            return;
        }
    }
}