FilterBarDropDownSelectionChanging Event

Occurs when the user selects a value from the drop-down list in the filter bar editor.

Syntax

Visual Basic
C#

'Declaration
 
Public Event FilterBarDropDownSelectionChanging As FilterBarDropDownSelectionChangingEventHandler

'Usage
 
Dim instance As FpSpread
Dim handler As FilterBarDropDownSelectionChangingEventHandler
 
AddHandler instance.FilterBarDropDownSelectionChanging, handler

public event FilterBarDropDownSelectionChangingEventHandler FilterBarDropDownSelectionChanging

Event Data

The event handler receives an argument of type FilterBarDropDownSelectionChangingEventArgs containing data related to this event. The following FilterBarDropDownSelectionChangingEventArgs properties provide information specific to this event.

Property	Description
ChangesObject	The new value.
ColumnIndex	Specifies the column index.
Handled	Indicates whether the new value is handled.

Example

This example uses the FilterBarDropDownSelectionChanging event.

private void Form1_Load(object sender, EventArgs e)
        {
            System.Globalization.DateTimeFormatInfo dtf = new System.Globalization.DateTimeFormatInfo();
            dtf.LongDatePattern = "D";
            dtf.ShortDatePattern = "M/d/yyyy";

            FarPoint.Win.Spread.CellType.FilterBarCellType fbcell = new FarPoint.Win.Spread.CellType.FilterBarCellType();
            fbcell.AutoFormat = true;
            fbcell.ContextMenuType = FarPoint.Win.Spread.CellType.FilterBarContextMenuType.DateTime;
            fbcell.DateTimeFormatInfo = dtf;
            fpSpread1.Sheets[0].AutoFilterMode = FarPoint.Win.Spread.AutoFilterMode.FilterBar;
            fpSpread1.Sheets[0].FilterBar.Cells[0].CellType = fbcell;
            fpSpread1.Sheets[0].Cells[0, 0].Value = DateTime.Now;
}

        private void fpSpread1_FilterBarDropDownSelectionChanging(object sender, FarPoint.Win.Spread.CellType.FilterBarDropDownSelectionChangingEventArgs e)
        {
            if (e.ChangesObject is string) //all condition to Contains using wildcard
            {
                // e.ChangesObject = "*" + e.ChangesObject.ToString() + "*";
                //e.Handled = true; //notify to use new changed value
            }
            else if (e.ChangesObject is DateTime) //change DateTime to a short format string
            {
                //e.ChangesObject = ((DateTime)e.ChangesObject).ToShortDateString();
                FarPoint.Win.Spread.CellType.DateTimeCellType dc = new FarPoint.Win.Spread.CellType.DateTimeCellType();
                dc.DateTimeFormat = FarPoint.Win.Spread.CellType.DateTimeFormat.UserDefined;
                dc.UserDefinedFormat = "M/d/yy";
                //e.ChangesObject = dc.Format(e.ChangesObject);
                GrapeCity.Win.Spread.InputMan.CellType.GcDateTimeCellType datecell = new GrapeCity.Win.Spread.InputMan.CellType.GcDateTimeCellType();
                GrapeCity.Win.Spread.InputMan.CellType.Fields.DateDayFieldInfo test = new GrapeCity.Win.Spread.InputMan.CellType.Fields.DateDayFieldInfo();
                datecell.FocusPosition = GrapeCity.Win.Spread.InputMan.CellType.FieldsEditorFocusCursorPosition.MouseLocation;
                datecell.Spin.AllowSpin = true;
                datecell.Spin.IncrementValue = new TimeSpan(2);
                datecell.DropDownCalendar.BackColor = Color.Red;
                datecell.DropDownCalendar.CalendarDimensions = new Size(3, 1);
                datecell.DropDownCalendar.Font = new Font("Arial", 10, FontStyle.Bold);              
                datecell.DropDown.AllowDrop = true;
                datecell.DropDown.AllowResize = true;
                datecell.DropDown.AutoDropDown = true;
                datecell.DefaultActiveField = datecell.Fields[2];
                e.ChangesObject = datecell.Format(e.ChangesObject);
                e.Handled = true; //notify to use new changed value
            }
            else if (e.ChangesObject is Color) // change color or icon enumerable
            {
                if (((Color)e.ChangesObject) == Color.Red) e.ChangesObject = Color.DarkBlue;
                e.Handled = true; //notify to use new changed value
            }
            else //by default it is false, not used
                e.Handled = false; //notify to not use new changed value
        }

VB.NET

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Dim dtf As New System.Globalization.DateTimeFormatInfo
        dtf.LongDatePattern = "D"
        dtf.ShortDatePattern = "M/d/yyyy"

        Dim fbcell As New FarPoint.Win.Spread.CellType.FilterBarCellType()
        fbcell.AutoFormat = True
        fbcell.ContextMenuType = FarPoint.Win.Spread.CellType.FilterBarContextMenuType.DateTime
        fbcell.DateTimeFormatInfo = dtf
        FpSpread1.Sheets(0).AutoFilterMode = FarPoint.Win.Spread.AutoFilterMode.FilterBar
        FpSpread1.Sheets(0).FilterBar.Cells(0).CellType = fbcell
        FpSpread1.Sheets(0).Cells(0, 0).Value = DateTime.Now
End Sub

 Private Sub FpSpread1_FilterBarDropDownSelectionChanging(ByVal sender As System.Object, ByVal e As FarPoint.Win.Spread.CellType.FilterBarDropDownSelectionChangingEventArgs) Handles FpSpread1.FilterBarDropDownSelectionChanging
        If TypeOf e.ChangesObject Is String Then
            ' e.ChangesObject = "*" + e.ChangesObject.ToString() + "*";
            'e.Handled = true; //notify to use new changed value
            'all condition to Contains using wildcard
        ElseIf TypeOf e.ChangesObject Is DateTime Then
            'change DateTime to a short format string
            'e.ChangesObject = ((DateTime)e.ChangesObject).ToShortDateString();
            Dim dc As New FarPoint.Win.Spread.CellType.DateTimeCellType()
            dc.DateTimeFormat = FarPoint.Win.Spread.CellType.DateTimeFormat.UserDefined
            dc.UserDefinedFormat = "M/d/yy"
            'e.ChangesObject = dc.Format(e.ChangesObject);
            Dim datecell As New GrapeCity.Win.Spread.InputMan.CellType.GcDateTimeCellType()
            Dim test As New GrapeCity.Win.Spread.InputMan.CellType.Fields.DateDayFieldInfo()           
            datecell.FocusPosition = GrapeCity.Win.Spread.InputMan.CellType.FieldsEditorFocusCursorPosition.MouseLocation            
            datecell.Spin.AllowSpin = True
            datecell.Spin.IncrementValue = New TimeSpan(2)
            datecell.DropDownCalendar.BackColor = Color.Red
            datecell.DropDownCalendar.CalendarDimensions = New Size(3, 1)
            datecell.DropDownCalendar.Font = New Font("Arial", 10, FontStyle.Bold)
            'datecell.DropDownCalendar.HeaderStyle.BackColor = Color.Green;
            datecell.DropDown.AllowDrop = True
            datecell.DropDown.AllowResize = True
            datecell.DropDown.AutoDropDown = True
            datecell.DefaultActiveField = datecell.Fields(2)
            e.ChangesObject = datecell.Format(e.ChangesObject)
            'notify to use new changed value
            e.Handled = True
        ElseIf TypeOf e.ChangesObject Is Color Then
            ' change color or icon enumerable
            If DirectCast(e.ChangesObject, Color) = Color.Red Then
                e.ChangesObject = Color.DarkBlue
            End If
            'notify to use new changed value
            e.Handled = True
        Else
            'by default it is false, not used
            e.Handled = False
        End If
        'notify to not use new changed value
    End Sub

Requirements

Target Platforms: Windows 2000 Professional (SP4), Windows 2000 Server, Windows 2003 Server (SP1), Windows Server 2012 R2, Windows 2008, Windows XP (SP2), Windows Vista, Windows 7, Windows 8, Windows 8.1, Windows 10

Reference

FpSpread Class
FpSpread Members