public IDisposable PushUpdateSelectionSource( UpdateSelectionSource updateSelectionSource )
{
// We raise the fromRowSelector flag here since it's possible
// that the focus is already on the correct Cell for the container
// mapped to the RowSelector, preventing the SelectionManager to
// do any processing.
if( updateSelectionSource == UpdateSelectionSource.RowSelector )
m_fromRowSelector = true;
return new UpdateSelectionSourceHelper( this, updateSelectionSource );
}
private void DoExtendedSelection(
DataGridContext oldCurrentDataGridContext,
object oldCurrentItem,
int oldCurrentColumnIndex,
DataGridContext dataGridContext,
bool oldFocusWasInTheGrid,
bool rowIsBeingEditedAndCurrentRowNotChanged,
int sourceDataItemIndex,
object item,
int columnIndex,
UpdateSelectionSource updateSelectionSource )
{
switch( updateSelectionSource )
{
case UpdateSelectionSource.Navigation:
{
if( oldFocusWasInTheGrid )
{
if( ( Keyboard.Modifiers & ModifierKeys.Control ) == ModifierKeys.Control )
{
if( ( Keyboard.Modifiers & ModifierKeys.Shift ) == ModifierKeys.Shift )
{
this.DoRangeSelection(
oldCurrentDataGridContext, oldCurrentItem, oldCurrentColumnIndex,
dataGridContext, sourceDataItemIndex, item, columnIndex, true );
}
else
{
m_rangeSelectionItemStartAnchor = m_owner.GetGlobalGeneratorIndexFromItem( dataGridContext, item );
m_rangeSelectionColumnStartAnchor = columnIndex;
if( Keyboard.IsKeyDown( Key.PageUp )
|| Keyboard.IsKeyDown( Key.PageDown )
|| Keyboard.IsKeyDown( Key.End )
|| Keyboard.IsKeyDown( Key.Home ) )
{
if( m_owner.SelectionUnit == SelectionUnit.Row )
{
if( sourceDataItemIndex == -1 )
{
this.UnselectAll();
}
else
{
this.SelectJustThisItem( dataGridContext, sourceDataItemIndex, item );
}
}
else
{
if( ( sourceDataItemIndex == -1 ) || ( columnIndex == -1 ) )
{
this.UnselectAll();
}
else
{
this.SelectJustThisCell( dataGridContext, sourceDataItemIndex, item, columnIndex );
}
}
}
}
}
else if( ( ( Keyboard.Modifiers & ModifierKeys.Shift ) == ModifierKeys.Shift ) && ( !Keyboard.IsKeyDown( Key.Tab ) ) )
{
this.DoRangeSelection(
oldCurrentDataGridContext, oldCurrentItem, oldCurrentColumnIndex,
dataGridContext, sourceDataItemIndex, item, columnIndex, false );
}
else
{
m_rangeSelectionItemStartAnchor = m_owner.GetGlobalGeneratorIndexFromItem( dataGridContext, item );
m_rangeSelectionColumnStartAnchor = columnIndex;
if( m_owner.SelectionUnit == SelectionUnit.Row )
{
if( sourceDataItemIndex == -1 )
{
this.UnselectAll();
}
else
{
if( ( !dataGridContext.SelectedItemsStore.Contains( sourceDataItemIndex ) ) || ( !rowIsBeingEditedAndCurrentRowNotChanged ) )
{
this.SelectJustThisItem( dataGridContext, sourceDataItemIndex, item );
}
}
}
else
{
if( ( sourceDataItemIndex == -1 ) || ( columnIndex == -1 ) )
{
this.UnselectAll();
}
else
{
if( ( !dataGridContext.SelectedCellsStore.Contains( sourceDataItemIndex, columnIndex ) ) || ( !rowIsBeingEditedAndCurrentRowNotChanged ) )
{
this.SelectJustThisCell( dataGridContext, sourceDataItemIndex, item, columnIndex );
}
}
}
}
}
break;
}
case UpdateSelectionSource.MouseDown:
{
if( ( Keyboard.Modifiers & ModifierKeys.Control ) == ModifierKeys.Control )
{
if( ( Keyboard.Modifiers & ModifierKeys.Shift ) == ModifierKeys.Shift )
{
this.DoRangeSelection(
oldCurrentDataGridContext, oldCurrentItem, oldCurrentColumnIndex,
dataGridContext, sourceDataItemIndex, item, columnIndex, true );
m_updateSelectionOnNextMouseUp = false;
}
else
{
m_rangeSelectionItemStartAnchor = m_owner.GetGlobalGeneratorIndexFromItem( dataGridContext, item );
m_rangeSelectionColumnStartAnchor = columnIndex;
if( m_owner.SelectionUnit == SelectionUnit.Row )
{
if( sourceDataItemIndex != -1 )
{
// this.Select return false when the item is already selected.
m_updateSelectionOnNextMouseUp = !this.SelectItems(
dataGridContext, new SelectionRangeWithItems( sourceDataItemIndex, item ) );
m_rowIsBeingEditedAndCurrentRowNotChanged = false;
}
}
else
{
if( ( sourceDataItemIndex != -1 ) && ( columnIndex != -1 ) )
{
// this.Select return false when the item is already selected.
m_updateSelectionOnNextMouseUp = !this.SelectCells(
dataGridContext, new SelectionCellRangeWithItems( sourceDataItemIndex, item, columnIndex ) );
m_rowIsBeingEditedAndCurrentRowNotChanged = rowIsBeingEditedAndCurrentRowNotChanged;
}
}
}
}
else if( ( Keyboard.Modifiers & ModifierKeys.Shift ) == ModifierKeys.Shift )
{
this.DoRangeSelection(
oldCurrentDataGridContext, oldCurrentItem, oldCurrentColumnIndex,
dataGridContext, sourceDataItemIndex, item, columnIndex, false );
m_updateSelectionOnNextMouseUp = false;
}
else
{
m_rangeSelectionItemStartAnchor = m_owner.GetGlobalGeneratorIndexFromItem( dataGridContext, item );
m_rangeSelectionColumnStartAnchor = columnIndex;
if( m_owner.SelectionUnit == SelectionUnit.Row )
{
if( sourceDataItemIndex == -1 )
{
this.UnselectAll();
}
else
{
if( !dataGridContext.SelectedItemsStore.Contains( sourceDataItemIndex ) )
{
this.SelectJustThisItem( dataGridContext, sourceDataItemIndex, item );
m_updateSelectionOnNextMouseUp = false;
}
else
{
m_updateSelectionOnNextMouseUp = true;
m_rowIsBeingEditedAndCurrentRowNotChanged = rowIsBeingEditedAndCurrentRowNotChanged;
}
}
}
else
{
if( ( sourceDataItemIndex == -1 ) || ( columnIndex == -1 ) )
{
this.UnselectAll();
}
else
{
if( !dataGridContext.SelectedCellsStore.Contains( sourceDataItemIndex, columnIndex ) )
{
this.SelectJustThisCell( dataGridContext, sourceDataItemIndex, item, columnIndex );
m_updateSelectionOnNextMouseUp = false;
}
else
{
m_updateSelectionOnNextMouseUp = true;
m_rowIsBeingEditedAndCurrentRowNotChanged = rowIsBeingEditedAndCurrentRowNotChanged;
}
}
}
}
break;
}
case UpdateSelectionSource.MouseUp:
{
if( ( m_updateSelectionOnNextMouseUp ) && ( !m_rowIsBeingEditedAndCurrentRowNotChanged ) )
{
if( m_owner.SelectionUnit == SelectionUnit.Row )
{
if( sourceDataItemIndex != -1 )
{
if( ( Keyboard.Modifiers & ModifierKeys.Shift ) == ModifierKeys.Shift )
{
bool keepPreviousSelection = ( ( Keyboard.Modifiers & ModifierKeys.Control ) == ModifierKeys.Control );
this.DoRangeSelection(
oldCurrentDataGridContext, oldCurrentItem, oldCurrentColumnIndex,
dataGridContext, sourceDataItemIndex, item, columnIndex, keepPreviousSelection );
}
else
{
m_rangeSelectionItemStartAnchor = m_owner.GetGlobalGeneratorIndexFromItem( dataGridContext, item );
m_rangeSelectionColumnStartAnchor = columnIndex;
if( ( Keyboard.Modifiers & ModifierKeys.Control ) == ModifierKeys.Control )
{
this.ToggleItemSelection( dataGridContext, sourceDataItemIndex, item );
}
else if( !rowIsBeingEditedAndCurrentRowNotChanged )
{
this.SelectJustThisItem( dataGridContext, sourceDataItemIndex, item );
}
}
}
}
else
{
if( sourceDataItemIndex != -1 )
{
if( m_fromRowSelector )
{
if( ( Keyboard.Modifiers & ModifierKeys.Shift ) == ModifierKeys.Shift )
{
bool keepPreviousSelection = ( ( Keyboard.Modifiers & ModifierKeys.Control ) == ModifierKeys.Control );
this.DoRangeSelection(
oldCurrentDataGridContext, oldCurrentItem, oldCurrentColumnIndex,
dataGridContext, sourceDataItemIndex, item, columnIndex, keepPreviousSelection, true );
}
else
{
m_rangeSelectionItemStartAnchor = m_owner.GetGlobalGeneratorIndexFromItem( dataGridContext, item );
m_rangeSelectionColumnStartAnchor = columnIndex;
if( ( Keyboard.Modifiers & ModifierKeys.Control ) == ModifierKeys.Control )
{
this.ToggleItemCellsSelection( dataGridContext,
sourceDataItemIndex,
item );
}
else
{
this.SelectItemCells( dataGridContext,
sourceDataItemIndex,
item,
false );
}
}
}
else if( columnIndex != -1 )
{
if( ( Keyboard.Modifiers & ModifierKeys.Shift ) == ModifierKeys.Shift )
{
bool keepPreviousSelection = ( ( Keyboard.Modifiers & ModifierKeys.Control ) == ModifierKeys.Control );
this.DoRangeSelection(
oldCurrentDataGridContext, oldCurrentItem, oldCurrentColumnIndex,
dataGridContext, sourceDataItemIndex, item, columnIndex, keepPreviousSelection );
}
else
{
m_rangeSelectionItemStartAnchor = m_owner.GetGlobalGeneratorIndexFromItem( dataGridContext, item );
m_rangeSelectionColumnStartAnchor = columnIndex;
if( ( Keyboard.Modifiers & ModifierKeys.Control ) == ModifierKeys.Control )
{
this.ToggleCellSelection( dataGridContext,
sourceDataItemIndex,
item,
columnIndex );
}
else
{
this.SelectJustThisCell( dataGridContext,
sourceDataItemIndex,
item,
columnIndex );
}
}
}
}
}
}
// Reset the fromRowSelector to ensure nothing special is done
// on next MouseUp (failsafe, should be reset by UpdateSelection)
m_fromRowSelector = false;
// We reset the m_updateSelectionOnNextMouseUp to be sure when no focus is moved
// around that mouse up will toggle selection
m_updateSelectionOnNextMouseUp = true;
m_rowIsBeingEditedAndCurrentRowNotChanged = false;
break;
}
case UpdateSelectionSource.SpaceDown:
{
if( ( Keyboard.Modifiers & ModifierKeys.Control ) == ModifierKeys.Control )
{
m_rangeSelectionItemStartAnchor = m_owner.GetGlobalGeneratorIndexFromItem( dataGridContext, item );
m_rangeSelectionColumnStartAnchor = columnIndex;
if( m_owner.SelectionUnit == SelectionUnit.Row )
{
if( sourceDataItemIndex != -1 )
{
this.ToggleItemSelection( dataGridContext, sourceDataItemIndex, item );
}
}
else
{
if( ( sourceDataItemIndex != -1 ) && ( columnIndex != -1 ) )
{
this.ToggleCellSelection( dataGridContext, sourceDataItemIndex, item, columnIndex );
}
}
}
break;
}
case UpdateSelectionSource.RowSelector:
{
// We must raise the same flags as in the MouseDown to ensure
// the MouseUp is correctly handled
if( ( Keyboard.Modifiers & ModifierKeys.Control ) == ModifierKeys.Control )
{
if( ( Keyboard.Modifiers & ModifierKeys.Shift ) == ModifierKeys.Shift )
{
this.DoRangeSelection(
oldCurrentDataGridContext, oldCurrentItem, oldCurrentColumnIndex,
dataGridContext, sourceDataItemIndex, item, columnIndex, true, true );
m_updateSelectionOnNextMouseUp = false;
}
else
{
m_rangeSelectionItemStartAnchor = m_owner.GetGlobalGeneratorIndexFromItem( dataGridContext, item );
m_rangeSelectionColumnStartAnchor = 0;
if( m_owner.SelectionUnit == SelectionUnit.Row )
{
if( sourceDataItemIndex != -1 )
{
// this.Select return false when the item is already selected.
m_updateSelectionOnNextMouseUp = !this.SelectItems(
dataGridContext, new SelectionRangeWithItems( sourceDataItemIndex, item ) );
}
}
else
{
if( sourceDataItemIndex != -1 )
{
// this.Select return false when the item is already selected.
m_updateSelectionOnNextMouseUp = !this.SelectItemCells( dataGridContext,
sourceDataItemIndex,
item,
true );
}
}
}
}
else if( ( Keyboard.Modifiers & ModifierKeys.Shift ) == ModifierKeys.Shift )
{
this.DoRangeSelection(
oldCurrentDataGridContext, oldCurrentItem, oldCurrentColumnIndex,
dataGridContext, sourceDataItemIndex, item, columnIndex, false, true );
m_updateSelectionOnNextMouseUp = false;
}
else
{
m_rangeSelectionItemStartAnchor = m_owner.GetGlobalGeneratorIndexFromItem( dataGridContext, item );
m_rangeSelectionColumnStartAnchor = 0;
if( m_owner.SelectionUnit == SelectionUnit.Row )
{
if( sourceDataItemIndex == -1 )
{
this.UnselectAll();
}
else
{
if( !dataGridContext.SelectedItemsStore.Contains( sourceDataItemIndex ) )
{
this.SelectJustThisItem( dataGridContext,
sourceDataItemIndex,
item );
m_updateSelectionOnNextMouseUp = false;
}
else
{
m_updateSelectionOnNextMouseUp = true;
}
}
}
else
{
if( ( sourceDataItemIndex == -1 ) || ( columnIndex == -1 ) )
{
this.UnselectAll();
}
else
{
m_updateSelectionOnNextMouseUp =
!this.SelectItemCells( dataGridContext, sourceDataItemIndex, item, false );
}
}
}
break;
}
}
}
private void DoMultipleSelection(
DataGridContext dataGridContext,
bool rowIsBeingEditedAndCurrentRowNotChanged,
int sourceDataItemIndex,
object item,
int columnIndex,
UpdateSelectionSource updateSelectionSource )
{
switch( updateSelectionSource )
{
case UpdateSelectionSource.MouseDown:
{
if( m_owner.SelectionUnit == SelectionUnit.Row )
{
if( sourceDataItemIndex != -1 )
{
// this.Select return false when the item is already selected.
m_updateSelectionOnNextMouseUp = !this.SelectItems(
dataGridContext, new SelectionRangeWithItems( sourceDataItemIndex, item ) );
}
}
else
{
if( ( sourceDataItemIndex != -1 ) && ( columnIndex != -1 ) )
{
// this.Select return false when the cell is already selected.
m_updateSelectionOnNextMouseUp = !this.SelectCells(
dataGridContext, new SelectionCellRangeWithItems( sourceDataItemIndex, item, columnIndex ) );
}
}
break;
}
case UpdateSelectionSource.MouseUp:
{
if( ( m_updateSelectionOnNextMouseUp ) && ( !rowIsBeingEditedAndCurrentRowNotChanged ) )
{
if( m_owner.SelectionUnit == SelectionUnit.Row )
{
if( sourceDataItemIndex != -1 )
{
this.ToggleItemSelection( dataGridContext, sourceDataItemIndex, item );
}
}
else
{
if( sourceDataItemIndex != -1 )
{
if( m_fromRowSelector )
{
this.ToggleItemCellsSelection( dataGridContext,
sourceDataItemIndex,
item );
}
else if( columnIndex != -1 )
{
this.ToggleCellSelection( dataGridContext,
sourceDataItemIndex,
item,
columnIndex );
}
}
}
}
// Reset the fromRowSelector to ensure nothing special is done
// on next MouseUp (failsafe, should be reset by UpdateSelection)
m_fromRowSelector = false;
// We reset the m_updateSelectionOnNextMouseUp to be sure when no focus is moved
// around that mouse up will toggle selection
m_updateSelectionOnNextMouseUp = true;
break;
}
case UpdateSelectionSource.SpaceDown:
{
if( m_owner.SelectionUnit == SelectionUnit.Row )
{
if( sourceDataItemIndex != -1 )
{
this.ToggleItemSelection( dataGridContext, sourceDataItemIndex, item );
}
}
else
{
if( ( sourceDataItemIndex != -1 ) && ( columnIndex != -1 ) )
{
this.ToggleCellSelection( dataGridContext,
sourceDataItemIndex,
item,
columnIndex );
}
}
break;
}
case UpdateSelectionSource.RowSelector:
{
m_fromRowSelector = true;
// We must raise the same flags as in the MouseDown to ensure
// the MouseUp is correctly handled
if( m_owner.SelectionUnit == SelectionUnit.Row )
{
if( sourceDataItemIndex != -1 )
{
// this.Select return false when the item is already selected.
m_updateSelectionOnNextMouseUp = !this.SelectItems(
dataGridContext, new SelectionRangeWithItems( sourceDataItemIndex, item ) );
}
}
else
{
if( ( sourceDataItemIndex != -1 ) && ( columnIndex != -1 ) )
{
// this.Select return false when the cell is already selected.
m_updateSelectionOnNextMouseUp = !this.SelectItemCells( dataGridContext,
sourceDataItemIndex,
item,
true );
}
}
break;
}
}
}
private void DoSingleSelection(
DataGridContext dataGridContext,
bool oldFocusWasInTheGrid,
bool rowIsBeingEditedAndCurrentRowNotChanged,
int sourceDataItemIndex,
object item,
int columnIndex,
UpdateSelectionSource updateSelectionSource )
{
bool doSelection = false;
if( updateSelectionSource == UpdateSelectionSource.Navigation )
{
if( oldFocusWasInTheGrid )
{
if( ( Keyboard.Modifiers & ModifierKeys.Control ) == ModifierKeys.None )
{
doSelection = true;
}
else //this means that CTRL was pressed
{
//if PageUp or PageDown or Home or End are pressed, it means its page navigation and in this case, I want to do SingleSelection
if( Keyboard.IsKeyDown( Key.PageUp )
|| Keyboard.IsKeyDown( Key.PageDown )
|| Keyboard.IsKeyDown( Key.End )
|| Keyboard.IsKeyDown( Key.Home ) )
{
doSelection = true;
}
}
}
}
else
{
doSelection = true;
}
// Special case for RowSelector : We do not want the
// MouseUp to clear the Selection when it was just set
// by the RowSelector
if( updateSelectionSource == UpdateSelectionSource.RowSelector )
{
m_fromRowSelector = true;
}
if( !doSelection )
return;
if( m_owner.SelectionUnit == SelectionUnit.Row )
{
if( sourceDataItemIndex != -1 )
{
this.SelectJustThisItem( dataGridContext, sourceDataItemIndex, item );
}
else
{
this.UnselectAll();
}
}
else
{
if( ( sourceDataItemIndex != -1 ) && ( columnIndex != -1 ) )
{
this.SelectJustThisCell( dataGridContext, sourceDataItemIndex, item, columnIndex );
}
else
{
// Do not remove selection when it comes from the RowSelector
if( !m_fromRowSelector )
{
this.UnselectAll();
}
}
}
}
public UpdateSelectionSourceHelper(
SelectionManager selectionManager,
UpdateSelectionSource newUpdateSelectionSource )
{
m_selectionManager = selectionManager;
m_oldUpdateSelectionSource = selectionManager.m_currentUpdateSelectionSource;
selectionManager.m_currentUpdateSelectionSource = newUpdateSelectionSource;
}