I have a datagridviews and two custom scrollbars - one vertical and one horizontal scrollbar.
I am resizing the scrollbars when datagridview is populated
scrollBarEx1.Maximum = dataGridView1.RowCount;
scrollBarEx3.Maximum = dataGridView1.ColumnCount;
This is the scroll event for datagridview1
private void dataGridView1_Scroll(object sender, ScrollEventArgs e)
{
if (e.ScrollOrientation == ScrollOrientation.VerticalScroll)
{
scrollBarEx1.Value = e.NewValue;
}
else if (e.ScrollOrientation == ScrollOrientation.HorizontalScroll)
{
scrollBarEx3.Value = e.NewValue;
}
}
And here under is the code for scroll event for both scrollbars
private void scrollBarEx1_Scroll(object sender, ScrollEventArgs e)
{
dataGridView1.Rows[dataGridView1.FirstDisplayedScrollingRowIndex].Height = e.NewValue;
}
private void scrollBarEx3_Scroll(object sender, ScrollEventArgs e)
{
dataGridView1.Columns[dataGridView1.FirstDisplayedScrollingColumnIndex].Width = e.NewValue;
}
However only vertical scroll is working. Horizontal scroll does scroll, but the grid does not scroll with it. Help please.
When you have a custom scroll you always set the values of maximum, largechange and small change as follows:
Horizontal Scroll
Maximum = total width
LargeChange = control width
SmallChange = 10% of total width, in this case the width of first columnVertical Scroll
Maximum = total height
LargeChange = control height
SmallChange = 10% of total height, in this case the height of first row
So for horizontal:
//set these values probably at form load event
int totalwidth = dataGridView1.RowHeadersWidth + 1;
for( int i = 0; i < dataGridView1.Columns.Count; i++ ) {
totalwidth += dataGridView1.Columns[ i ].Width;
}
hScrollBar1.Maximum = totalwidth;
hScrollBar1.LargeChange = dataGridView1.Width;
hScrollBar1.SmallChange= dataGridView1.Columns[ 0 ].Width;
and
private void dataGridView1_Scroll( object sender, ScrollEventArgs e ) {
if( e.ScrollOrientation == ScrollOrientation.HorizontalScroll ) {
hScrollBar1.Value = e.NewValue;
}
}
private void hScrollBar1_Scroll( object sender, ScrollEventArgs e ) {
dataGridView1.HorizontalScrollingOffset = e.NewValue;
}
EDIT
for verticall scroll in DataGridView you can't scroll by pixels but by rows only. So
Vertical Scroll
Maximum = total number of rows
LargeChange = number of visible rows, even a small part counts
SmallChange = 1
So for vertical
vScrollBar1.Maximum = dataGridView1.RowCount;
vScrollBar1.LargeChange = dataGridView1.DisplayedRowCount(true);
vScrollBar1.SmallChange = 1;
and
private void dataGridView1_Scroll( object sender, ScrollEventArgs e ) {
if( e.ScrollOrientation == ScrollOrientation.VerticalScroll ) {
vScrollBar1.Value = e.NewValue;
}
}
private void vScrollBar1_Scroll( object sender, ScrollEventArgs e ) {
dataGridView1.FirstDisplayedScrollingRowIndex = e.NewValue;
}
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