SftTree/OCX 7.5 - ActiveX Tree Control

Image Property, SftTreeHeader Object

Defines the graphic displayed in this column header.

Syntax

Get

Put

object

A SftTreeHeader object.

refImageObj

Defines the graphic displayed in this column header.

Comments

The Image property defines the graphic displayed in this column header.

All graphics used in a tree control as Image property at the same time must be the same size (height and width). The dimensions of the graphics are used to calculate the minimum dimension for the column headers, so graphics used as Image property are never clipped vertically. To change the column header graphic size, all column header graphics must be removed first by setting the Image property to Nothing (NULL) for each column before assigning new column header graphics.

If the image object refImageObj defines a bitmap, the top, left pixel of the bitmap must contain the bitmap's background color. This color will be replaced throughout the bitmap with the actual background (see Bitmap Transparency).

If a column header is disabled (see Header.Enabled property), the graphic is drawn in a "grayed" fashion, if it is based on a bitmap. Other image types, like color samples, .NET image objects, etc., must be explicitly replaced with a grayed image if a different rendering of a disabled image is desired.

The Image property can be set to the value Nothing (NULL), which removes the graphic from the column header.

The position of the column header graphic is determined by the Header.ImageHAlign, Header.ImageVAlign and Header.TextHAlign properties.

Examples

VB.NET

        ItemIndex = AxSftTree1.Items.Current
        If ItemIndex < 0 Then Exit Sub

        ' don't use images that are too large in the other areas
        Img = AxSftTree1.get_Cell(ItemIndex, 0).Image
        If Img.ActualHeight <= 20 And Img.ActualWidth <= 20 Then
            AxSftTree1.RowColumnHeader.Image = Img
            AxSftTree1.get_Header(1).Image = Img
        Else
            AxSftTree1.RowColumnHeader.Image.Clear()
            AxSftTree1.get_Header(1).Image.Clear()
        End If
    End Sub

    Private Sub ToggleImage(ByVal Img As SftPictureObject)

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VB6

    ItemIndex = SftTree1.Items.Current
    If ItemIndex < 0 Then Exit Sub

    ' don't use images that are too large in the other areas
    Set Img = SftTree1.Cell(ItemIndex, 0).Image
    If Img.ActualHeight <= 20 And Img.ActualWidth <= 20 Then
        SftTree1.RowColumnHeader.Image = Img
        SftTree1.Header(1).Image = Img
    Else
        SftTree1.RowColumnHeader.Image.Clear
        SftTree1.Header(1).Image.Clear
    End If

End Sub

Private Sub ToggleImage(Img As SftPictureObject)

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C#

            ItemIndex = axSftTree1.Items.Current;
            if (ItemIndex < 0)
                return;

            // don't use images that are too large in the other areas
            Img = axSftTree1.get_Cell(ItemIndex, 0).Image;
            if (Img.ActualHeight <= 20 && Img.ActualWidth <= 20) {
                axSftTree1.RowColumnHeader.Image = Img;
                axSftTree1.get_Header(1).Image = Img;
            } else {
                axSftTree1.RowColumnHeader.Image.Clear();
                axSftTree1.get_Header(1).Image.Clear();
            }
        }

        private void ToggleImage(SftPictureObject Img)

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C++

{
    long ItemIndex = m_vTree->Items->Current;
    if (ItemIndex < 0) return;

    // don't use images that are too large in the other areas
    ISftPictureObjectPtr pImg = m_vTree->Cell[ItemIndex][0]->Image;
    if (pImg->ActualHeight <= 20 && pImg->ActualWidth <= 20) {
        m_vTree->RowColumnHeader->Image = pImg;
        m_vTree->Header[1]->Image = pImg;
    } else {
        m_vTree->RowColumnHeader->Image->Clear();
        m_vTree->Header[1]->Image->Clear();
    }
}

void CPicturesDlg::OnItemClickSftTree1(long ItemIndex, short ColIndex, short AreaType, short Button, short Shift)

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See Also SftTreeHeader Object | Object Hierarchy