protected virtual void OnSelectionChanging(VirtualGridSelectionChangingEventArgs args)
{
if (this.SelectionChanging == null)
{
return;
}
this.SelectionChanging((object)this, args);
}
public void ClearSelection()
{
VirtualGridSelectionChangingEventArgs args = new VirtualGridSelectionChangingEventArgs(VirtualGridSelectionAction.ClearSelection, 0, 0, this.CurrentViewInfo);
this.OnSelectionChanging(args);
if (args.Cancel)
{
return;
}
this.ClearSelectedRegions();
this.startRow = this.endRow = this.startColumn = this.endColumn = -1;
this.boundingRegion = SelectionRegion.Empty;
this.OnSelectionChanged();
}
public void SelectAll()
{
if (!this.Multiselect)
{
return;
}
VirtualGridSelectionChangingEventArgs args = new VirtualGridSelectionChangingEventArgs(VirtualGridSelectionAction.SelectAll, 0, 0, this.CurrentViewInfo);
this.OnSelectionChanging(args);
if (args.Cancel)
{
return;
}
this.ClearSelectedRegions();
this.startRow = this.startColumn = 0;
this.endRow = this.CurrentViewInfo.RowCount - 1;
this.endColumn = this.CurrentViewInfo.ColumnCount - 1;
this.OnSelectionChanged();
}
public void ExtendCurrentRegion(int rowIndex, int columnIndex)
{
if ((this.SelectionMode != VirtualGridSelectionMode.FullRowSelect || this.endRow == rowIndex) && (this.SelectionMode != VirtualGridSelectionMode.CellSelect || this.endColumn == columnIndex && this.endRow == rowIndex))
{
return;
}
VirtualGridSelectionChangingEventArgs args = new VirtualGridSelectionChangingEventArgs(VirtualGridSelectionAction.ExtendSelection, rowIndex, columnIndex, this.CurrentViewInfo);
this.OnSelectionChanging(args);
if (args.Cancel)
{
return;
}
this.endRow = rowIndex;
if (this.SelectionMode == VirtualGridSelectionMode.CellSelect)
{
this.endColumn = columnIndex;
}
else if (this.SelectionMode == VirtualGridSelectionMode.FullRowSelect)
{
this.endColumn = this.CurrentViewInfo.ColumnCount - 1;
}
this.OnSelectionChanged();
}
public void BeginSelection(
int rowIndex,
int columnIndex,
VirtualGridViewInfo viewInfo,
bool keepSelection)
{
keepSelection &= this.currentViewInfo == viewInfo;
VirtualGridSelectionChangingEventArgs args = new VirtualGridSelectionChangingEventArgs(keepSelection ? VirtualGridSelectionAction.BeginSelection : VirtualGridSelectionAction.ClearAndBeginSelection, rowIndex, columnIndex, viewInfo);
this.OnSelectionChanging(args);
if (args.Cancel)
{
return;
}
if (!keepSelection)
{
this.ClearSelectedRegions();
this.boundingRegion = SelectionRegion.Empty;
}
else
{
this.AddSelectedRegions(this.SelectedRegion);
}
this.currentViewInfo = viewInfo;
this.startRow = this.endRow = rowIndex;
if (this.SelectionMode == VirtualGridSelectionMode.CellSelect)
{
this.startColumn = this.endColumn = columnIndex;
}
else if (this.SelectionMode == VirtualGridSelectionMode.FullRowSelect)
{
this.startColumn = 0;
this.endColumn = this.CurrentViewInfo.ColumnCount - 1;
}
this.OnSelectionChanged();
}