protected virtual void HandlePageEndKey(KeyEventArgs e)
{
if (e.Handled)
{
return;
}
DataGridContext dataGridContext = null;
if (e.OriginalSource != null)
{
dataGridContext = DataGridControl.GetDataGridContext(e.OriginalSource as DependencyObject);
}
else
{
dataGridContext = DataGridControl.GetDataGridContext(this);
}
if (dataGridContext == null)
{
return;
}
PagingBehavior pagingBehavior = dataGridContext.DataGridControl.PagingBehavior;
NavigationBehavior navigationBehavior = dataGridContext.DataGridControl.NavigationBehavior;
ColumnBase CurrentColumn = dataGridContext.CurrentColumn;
if (((navigationBehavior == NavigationBehavior.CellOnly) ||
(navigationBehavior == NavigationBehavior.RowOrCell)) &&
(CurrentColumn != null))
{
int oldCurrentIndex = CurrentColumn.Index;
NavigationHelper.MoveFocusToLastVisibleColumn(dataGridContext);
//if the last focusable column is is within the viewport, scroll to Extended offset, otherwise, bringIntoView
if ((this.IsCellsOffsetNeedReset(dataGridContext)) && (oldCurrentIndex == CurrentColumn.Index))
{
this.Dispatcher.BeginInvoke(DispatcherPriority.Normal, new Action(this.ScrollToRightEnd));
}
if ((e.KeyboardDevice.Modifiers & ModifierKeys.Control) == ModifierKeys.Control)
{
if (pagingBehavior == PagingBehavior.TopToBottom)
{
this.ScrollToBottom();
}
else
{
this.ScrollToRightEnd();
}
this.HandlePageDownNavigation();
}
}
else
{
if ((e.KeyboardDevice.Modifiers & ModifierKeys.Control) == ModifierKeys.Control)
{
this.ScrollToBottom();
this.ScrollToRightEnd();
// Than handle new selection!
if (navigationBehavior != NavigationBehavior.None)
{
this.HandlePageDownNavigation();
}
}
else
{
if (pagingBehavior == PagingBehavior.TopToBottom)
{
this.ScrollToRightEnd();
}
else
{
this.ScrollToBottom();
}
}
}
e.Handled = true;
}
protected virtual void HandlePageDownKey(KeyEventArgs e)
{
if (e.Handled)
{
return;
}
DataGridContext dataGridContext = null;
if (e.OriginalSource != null)
{
dataGridContext = DataGridControl.GetDataGridContext(e.OriginalSource as DependencyObject);
}
else
{
dataGridContext = DataGridControl.GetDataGridContext(this);
}
if (dataGridContext == null)
{
return;
}
DataGridControl dataGridControl = dataGridContext.DataGridControl;
PagingBehavior pagingBehavior = dataGridControl.PagingBehavior;
NavigationBehavior navigationBehavior = dataGridControl.NavigationBehavior;
// If the Ctrl Modifier was held at the same time
if ((e.KeyboardDevice.Modifiers & ModifierKeys.Control) == ModifierKeys.Control)
{
// Scroll to absolute end of the scroll viewer
if (pagingBehavior == PagingBehavior.TopToBottom)
{
this.ScrollToBottom();
}
else
{
this.ScrollToRightEnd();
}
// Then handle new selection!
if (navigationBehavior != NavigationBehavior.None)
{
this.HandlePageDownNavigation();
}
}
//No special modifiers were held
else
{
FrameworkElement lastVisibleContainer = ScrollViewerHelper.GetLastVisibleContainer(
dataGridControl, dataGridControl.ItemsHost, this);
if (lastVisibleContainer != null)
{
// There is an identified weakness with the IsKeyboardFocusWithin property where
// it cannot tell if the focus is within a Popup which is within the element
// This has been identified, and only the places where it caused problems
// were fixed... This comment is only here to remind developpers of the flaw
// If the item has keyboard focus
if ((lastVisibleContainer.IsKeyboardFocusWithin) || (lastVisibleContainer.IsKeyboardFocused) ||
(navigationBehavior == NavigationBehavior.None))
{
// Then scroll
if (pagingBehavior == PagingBehavior.TopToBottom)
{
this.PageDown();
}
else
{
this.PageRight();
}
}
//and process new selection
if (navigationBehavior != NavigationBehavior.None)
{
this.HandlePageDownNavigation();
}
}
else
{
// Normaly for when we are in dataGridControl.NavigationBehavior == NavigationBehavior.None
if (pagingBehavior == PagingBehavior.TopToBottom)
{
this.PageDown();
}
else
{
this.PageRight();
}
}
}
e.Handled = true;
}
protected virtual void HandlePageHomeKey(KeyEventArgs e)
{
if (e.Handled)
{
return;
}
DataGridContext dataGridContext = null;
if (e.OriginalSource != null)
{
dataGridContext = DataGridControl.GetDataGridContext(e.OriginalSource as DependencyObject);
}
else
{
dataGridContext = DataGridControl.GetDataGridContext(this);
}
if (dataGridContext == null)
{
return;
}
PagingBehavior pagingBehavior = dataGridContext.DataGridControl.PagingBehavior;
NavigationBehavior navigationBehavior = dataGridContext.DataGridControl.NavigationBehavior;
ColumnBase currentColumn = dataGridContext.CurrentColumn;
if (((navigationBehavior == NavigationBehavior.CellOnly) ||
(navigationBehavior == NavigationBehavior.RowOrCell)) &&
(currentColumn != null))
{
int oldCurrentIndex = currentColumn.Index;
NavigationHelper.MoveFocusToFirstVisibleColumn(dataGridContext);
var columnVirtualizationManager = dataGridContext.ColumnVirtualizationManager as TableViewColumnVirtualizationManagerBase;
//if the first focusable column is is within the viewport, scroll so 0d offset, otherwise, bringIntoView
bool isFixedColumn = (columnVirtualizationManager == null) ?
false : columnVirtualizationManager.GetFixedFieldNames().Contains(currentColumn.FieldName);
if (((this.IsCellsOffsetNeedReset(dataGridContext)) &&
(oldCurrentIndex == currentColumn.Index)) ||
(isFixedColumn))
{
this.Dispatcher.BeginInvoke(DispatcherPriority.Normal, new Action(this.ScrollToLeftEnd));
}
if ((e.KeyboardDevice.Modifiers & ModifierKeys.Control) == ModifierKeys.Control)
{
if (pagingBehavior == PagingBehavior.TopToBottom)
{
this.ScrollToTop();
}
else
{
this.ScrollToLeftEnd();
}
this.HandlePageUpNavigation();
}
}
else
{
if ((e.KeyboardDevice.Modifiers & ModifierKeys.Control) == ModifierKeys.Control)
{
this.ScrollToTop();
this.ScrollToLeftEnd();
//than handle new selection!
if (navigationBehavior != NavigationBehavior.None)
{
this.HandlePageUpNavigation();
}
}
else
{
if (pagingBehavior == PagingBehavior.TopToBottom)
{
this.ScrollToLeftEnd();
}
else
{
this.ScrollToTop();
}
}
}
e.Handled = true;
}
protected virtual void HandleSystemKey(KeyEventArgs e)
{
if (e.Handled)
{
return;
}
DataGridContext dataGridContext = null;
if (e.OriginalSource != null)
{
dataGridContext = DataGridControl.GetDataGridContext(e.OriginalSource as DependencyObject);
}
else
{
dataGridContext = DataGridControl.GetDataGridContext(this);
}
if (dataGridContext == null)
{
return;
}
PagingBehavior pagingBehavior = dataGridContext.DataGridControl.PagingBehavior;
// If Alt-PageDown was pressed
if (e.SystemKey == Key.PageDown)
{
// Process Paging in opposed axis
if (pagingBehavior == PagingBehavior.TopToBottom)
{
this.PageRight();
}
else
{
this.PageDown();
}
e.Handled = true;
}
// If Alt-PageUp was pressed
else if (e.SystemKey == Key.PageUp)
{
// Process scrolling in opposed axis
if (pagingBehavior == PagingBehavior.TopToBottom)
{
this.PageLeft();
}
else
{
this.PageUp();
}
e.Handled = true;
}
else
{
// If neither Alt-PageUp or alt-PageDown, flag the input as non-processed.
e.Handled = false;
}
}
