private async Task ExecuteCommandAsync(ScrollCommand cmd, CancellationToken token)
{
var suppress = false;
switch (cmd.UpdateType)
{
case LineUp:
Points.VerticalOffset -= Points.AverageItemHeight * Convert.ToInt32(cmd.Param);
break;
case LineDown:
Points.VerticalOffset += Points.AverageItemHeight * Convert.ToInt32(cmd.Param);
break;
case LineLeft:
Points.HorizontalOffset -= Points.AverageItemHeight * Convert.ToInt32(cmd.Param); // for horizontal line increment, use vertical size
break;
case LineRight:
Points.HorizontalOffset += Points.AverageItemHeight * Convert.ToInt32(cmd.Param); // for horizontal line increment, use vertical size
break;
case PageUp:
Points.VerticalOffset -= Points.ViewportHeight * Convert.ToInt32(cmd.Param);
break;
case PageDown:
Points.VerticalOffset += Points.ViewportHeight * Convert.ToInt32(cmd.Param);
break;
case PageLeft:
Points.HorizontalOffset -= Points.ViewportWidth * Convert.ToInt32(cmd.Param);
break;
case PageRight:
Points.HorizontalOffset += Points.ViewportWidth * Convert.ToInt32(cmd.Param);
break;
case SetHorizontalOffset: {
var(offset, thumbtrack) = ((double, ThumbTrack))cmd.Param;
Points.HorizontalOffset = offset * (Points.HorizontalExtent - Points.ViewportWidth);
suppress = thumbtrack == ThumbTrack.Track;
}
break;
case SetVerticalOffset: {
var(offset, thumbtrack) = ((double, ThumbTrack))cmd.Param;
Points.VerticalOffset = offset * (Points.VerticalExtent - Points.ViewportHeight);
suppress = thumbtrack == ThumbTrack.Track;
}
break;
case MouseWheel:
Points.VerticalOffset -= Convert.ToInt32(cmd.Param);
break;
case SizeChange:
Points.ViewportWidth = ((Size)cmd.Param).Width;
Points.ViewportHeight = ((Size)cmd.Param).Height;
break;
case Refresh:
case Sort:
break;
case FocusUp:
DataGrid.SelectedIndex = new GridIndex(Math.Max(DataGrid.SelectedIndex.Row - Convert.ToInt32(cmd.Param), 0), DataGrid.SelectedIndex.Column);
await BringFocusedCellIntoViewAsync(token);
return;
case FocusDown:
DataGrid.SelectedIndex = new GridIndex(Math.Min(DataGrid.SelectedIndex.Row + Convert.ToInt32(cmd.Param), DataProvider.RowCount - 1), DataGrid.SelectedIndex.Column);
await BringFocusedCellIntoViewAsync(token);
return;
case FocusLeft:
DataGrid.SelectedIndex = new GridIndex(DataGrid.SelectedIndex.Row, Math.Max(DataGrid.SelectedIndex.Column - Convert.ToInt32(cmd.Param), 0));
await BringFocusedCellIntoViewAsync(token);
return;
case FocusRight:
DataGrid.SelectedIndex = new GridIndex(DataGrid.SelectedIndex.Row, Math.Min(DataGrid.SelectedIndex.Column + Convert.ToInt32(cmd.Param), DataProvider.RowCount - 1));
await BringFocusedCellIntoViewAsync(token);
return;
case FocusPageUp:
DataGrid.SelectedIndex = new GridIndex(Math.Max(DataGrid.SelectedIndex.Row - Convert.ToInt32(cmd.Param), 0), DataGrid.SelectedIndex.Column);
await BringFocusedCellIntoViewAsync(token);
return;
case FocusPageDown:
DataGrid.SelectedIndex = new GridIndex(Math.Min(DataGrid.SelectedIndex.Row + Convert.ToInt32(cmd.Param), DataProvider.RowCount - 1), DataGrid.SelectedIndex.Column);
await BringFocusedCellIntoViewAsync(token);
return;
case SetFocus:
DataGrid.SelectedIndex = (GridIndex)cmd.Param;
await BringFocusedCellIntoViewAsync(token);
return;
case HeaderFocusLeft:
ColumnHeader.SelectedIndex = new GridIndex(ColumnHeader.SelectedIndex.Row, Math.Max(ColumnHeader.SelectedIndex.Column - Convert.ToInt32(cmd.Param), 0));
await BringFocusedHeaderIntoViewAsync(token);
return;
case HeaderFocusRight:
ColumnHeader.SelectedIndex = new GridIndex(ColumnHeader.SelectedIndex.Row, Math.Min(ColumnHeader.SelectedIndex.Column + Convert.ToInt32(cmd.Param), DataProvider.RowCount - 1));
await BringFocusedHeaderIntoViewAsync(token);
return;
case SetHeaderFocus:
ColumnHeader.SelectedIndex = (GridIndex)cmd.Param;
await BringFocusedHeaderIntoViewAsync(token);
return;
case Invalid:
default:
return;
}
await DrawVisualsAsync(cmd.UpdateType, suppress, token, _owner.ColumnHeader?.SortOrder);
}
private async Task ExecuteCommandAsync(ScrollCommand cmd, CancellationToken token) {
bool drawVisual = true;
bool suppress = false;
switch (cmd.UpdateType) {
case GridUpdateType.LineUp:
Points.VerticalOffset -= Points.AverageItemHeight * (double)cmd.Param;
break;
case GridUpdateType.LineDown:
Points.VerticalOffset += Points.AverageItemHeight * (double)cmd.Param;
break;
case GridUpdateType.LineLeft:
Points.HorizontalOffset -= Points.AverageItemHeight * (double)cmd.Param; // for horizontal line increment, use vertical size
break;
case GridUpdateType.LineRight:
Points.HorizontalOffset += Points.AverageItemHeight * (double)cmd.Param; // for horizontal line increment, use vertical size
break;
case GridUpdateType.PageUp:
Points.VerticalOffset -= Points.ViewportHeight * (double)cmd.Param;
break;
case GridUpdateType.PageDown:
Points.VerticalOffset += Points.ViewportHeight * (double)cmd.Param;
break;
case GridUpdateType.PageLeft:
Points.HorizontalOffset -= Points.ViewportWidth * (double)cmd.Param;
break;
case GridUpdateType.PageRight:
Points.HorizontalOffset += Points.ViewportWidth * (double)cmd.Param;
break;
case GridUpdateType.SetHorizontalOffset: {
var args = (Tuple<double, ThumbTrack>)cmd.Param;
Points.HorizontalOffset = args.Item1 * (Points.HorizontalExtent - Points.ViewportWidth);
suppress = args.Item2 == ThumbTrack.Track;
}
break;
case GridUpdateType.SetVerticalOffset: {
var args = (Tuple<double, ThumbTrack>)cmd.Param;
Points.VerticalOffset = args.Item1 * (Points.VerticalExtent - Points.ViewportHeight);
suppress = args.Item2 == ThumbTrack.Track;
}
break;
case GridUpdateType.MouseWheel:
Points.VerticalOffset -= (double)cmd.Param;
break;
case GridUpdateType.SizeChange:
Points.ViewportWidth = ((Size)cmd.Param).Width;
Points.ViewportHeight = ((Size)cmd.Param).Height;
break;
case GridUpdateType.Refresh:
case GridUpdateType.Sort:
break;
case GridUpdateType.Invalid:
default:
drawVisual = false;
break;
}
if (drawVisual) {
await DrawVisualsAsync(cmd.UpdateType, suppress, token, _owner.ColumnHeader?.SortOrder);
}
}
private async Task ExecuteCommandAsync(ScrollCommand cmd, CancellationToken token)
{
bool drawVisual = true;
bool suppress = false;
switch (cmd.UpdateType)
{
case GridUpdateType.LineUp:
Points.VerticalOffset -= Points.AverageItemHeight * (double)cmd.Param;
break;
case GridUpdateType.LineDown:
Points.VerticalOffset += Points.AverageItemHeight * (double)cmd.Param;
break;
case GridUpdateType.LineLeft:
Points.HorizontalOffset -= Points.AverageItemHeight * (double)cmd.Param; // for horizontal line increment, use vertical size
break;
case GridUpdateType.LineRight:
Points.HorizontalOffset += Points.AverageItemHeight * (double)cmd.Param; // for horizontal line increment, use vertical size
break;
case GridUpdateType.PageUp:
Points.VerticalOffset -= Points.ViewportHeight * (double)cmd.Param;
break;
case GridUpdateType.PageDown:
Points.VerticalOffset += Points.ViewportHeight * (double)cmd.Param;
break;
case GridUpdateType.PageLeft:
Points.HorizontalOffset -= Points.ViewportWidth * (double)cmd.Param;
break;
case GridUpdateType.PageRight:
Points.HorizontalOffset += Points.ViewportWidth * (double)cmd.Param;
break;
case GridUpdateType.SetHorizontalOffset: {
var args = (Tuple <double, ThumbTrack>)cmd.Param;
Points.HorizontalOffset = args.Item1 * (Points.HorizontalExtent - Points.ViewportWidth);
suppress = args.Item2 == ThumbTrack.Track;
}
break;
case GridUpdateType.SetVerticalOffset: {
var args = (Tuple <double, ThumbTrack>)cmd.Param;
Points.VerticalOffset = args.Item1 * (Points.VerticalExtent - Points.ViewportHeight);
suppress = args.Item2 == ThumbTrack.Track;
}
break;
case GridUpdateType.MouseWheel:
Points.VerticalOffset -= (double)cmd.Param;
break;
case GridUpdateType.SizeChange:
Points.ViewportWidth = ((Size)cmd.Param).Width;
Points.ViewportHeight = ((Size)cmd.Param).Height;
break;
case GridUpdateType.Refresh:
case GridUpdateType.Sort:
break;
case GridUpdateType.Invalid:
default:
drawVisual = false;
break;
}
if (drawVisual)
{
await DrawVisualsAsync(cmd.UpdateType, suppress, token, _owner.ColumnHeader?.SortOrder);
}
}
