Class GridBaseSelectionController

Provides the base implementation for selection in SfDataGrid.

Inheritance

System.Object

GridBaseSelectionController

GridCellSelectionController

GridSelectionController

Implements

IGridSelectionController

System.ComponentModel.INotifyPropertyChanged

System.IDisposable

Namespace: Syncfusion.UI.Xaml.Grid

Assembly: Syncfusion.SfGrid.WPF.dll

Syntax

public abstract class GridBaseSelectionController : Object, IGridSelectionController, INotifyPropertyChanged, IDisposable

Constructors

GridBaseSelectionController(SfDataGrid)

Initializes a new instance of GridBaseSelectionController class.

Declaration

public GridBaseSelectionController(SfDataGrid dataGrid)

Parameters

Type	Name	Description
SfDataGrid	dataGrid	The corresponding SfDataGrid instance.

Fields

currentKey

Gets or sets the currently pressed key.

Declaration

protected Key currentKey

Field Value

Type
System.Windows.Input.Key

lastPressedKey

Gets or sets the last pressed key.

Declaration

protected Key lastPressedKey

Field Value

Type
System.Windows.Input.Key

Properties

CurrentCellManager

Gets the reference to the GridCurrentCellManager instance which holds the current cell information.

Declaration

public GridCurrentCellManager CurrentCellManager { get; protected set; }

Property Value

Type
GridCurrentCellManager

Remarks

GridCurrentCellManager creates the current cell and manages the current cell related operations.

DataGrid

Gets or sets the reference to the SfDataGrid control.

Declaration

public SfDataGrid DataGrid { get; protected set; }

Property Value

Type	Description
SfDataGrid	The reference to the SfDataGrid control.

GroupRowSelectionBrush

Gets or sets a brush that highlights the background of currently selected group caption and group summary rows.

Declaration

public Brush GroupRowSelectionBrush { get; set; }

Property Value

Type	Description
System.Windows.Media.Brush	The brush that highlights the background of currently selected group row.

IsSuspended

Gets or sets a value to suspend the selection operations that are performed internally.

Declaration

public bool IsSuspended { get; }

Property Value

Type	Description
System.Boolean	true if the selection operations is suspended; otherwise , false.

PressedRowColumnIndex

Gets or sets the pressed RowColumnIndex of SfDataGrid.

Declaration

protected RowColumnIndex PressedRowColumnIndex { get; set; }

Property Value

Type
RowColumnIndex

RowHoverBackgroundBrush

Gets or sets a brush that highlights the background of data row is being hovered.

Declaration

public Brush RowHoverBackgroundBrush { get; set; }

Property Value

Type	Description
System.Windows.Media.Brush	The brush that highlights the data row is being hovered.

RowSelectionBrush

Gets or sets a brush that highlights the background of the currently selected row or cell.

Declaration

public Brush RowSelectionBrush { get; set; }

Property Value

Type	Description
System.Windows.Media.Brush	The brush that highlights the background of the selected row or cell.

SelectedCells

Gets or sets the collection of that contains the information of selected cells.

Declaration

public GridSelectedCellsCollection SelectedCells { get; protected set; }

Property Value

Type	Description
GridSelectedCellsCollection	The collection of .

SelectedRows

Gets or sets the collection of GridRowInfo that contains the information of selected rows.

Declaration

public GridSelectedRowsCollection SelectedRows { get; protected set; }

Property Value

Type	Description
GridSelectedRowsCollection	The collection of GridRowInfo.

SuspendAutoScrolling

Gets or sets a value that indicates whether the drag selection is disabled or not.

Declaration

public bool SuspendAutoScrolling { get; set; }

Property Value

Type	Description
System.Boolean	true if the drag selection is disabled in SfDataGrid; otherwise ,false.

Methods

AutoScrollerValueChanged(Object, AutoScrollerValueChangedEventArgs)

Invoked when the selection is dragged out of view area in SfDataGrid.

Declaration

protected virtual void AutoScrollerValueChanged(object sender, AutoScrollerValueChangedEventArgs args)

Parameters

Type	Name	Description
System.Object	sender	The sender that contains the SfDataGrid.
AutoScrollerValueChangedEventArgs	args	Contains the event data.

CanStartAutoScroller(Point, MouseEventArgs)

Determines whether the auto scroller is enabled when the drag selection reaches the out of visible boundaries in SfDataGrid.

Declaration

protected bool CanStartAutoScroller(Point point, MouseEventArgs args)

Parameters

Type	Name	Description
System.Windows.Point	point	Represents the corresponding position of mouse to decide whether the selection is dragged out of view in SfDataGrid.
System.Windows.Input.MouseEventArgs	args	Contains the data for mouse related events.

Returns

Type	Description
System.Boolean	true if the mouse point reaches the out of visible boundaries; Returns false , if the mouse point inside the visible boundary or the SelectionMode is single or none .

ChangeFlowDirectionKey(ref Key)

Changes the flow direction of key navigation based on the System.Windows.FlowDirection in SfDataGrid.

Declaration

protected void ChangeFlowDirectionKey(ref Key currentKey)

Parameters

Type	Name	Description
System.Windows.Input.Key	currentKey	Contains the key that was pressed.

CheckIsLastRow(SfDataGrid)

Determines whether the currently navigated row is last row.

Declaration

protected bool CheckIsLastRow(SfDataGrid dataGrid)

Parameters

Type	Name	Description
SfDataGrid	dataGrid

Returns

Type	Description
System.Boolean	Returns true if the navigated row is last row; otherwise, false

ClearDetailsViewGridSelections(SfDataGrid)

Clears all the selection for the specified DetailsViewDataGrid.

Declaration

protected virtual bool ClearDetailsViewGridSelections(SfDataGrid detailsViewDataGrid)

Parameters

Type	Name	Description
SfDataGrid	detailsViewDataGrid	The corresponding DetailsViewDataGrid to clear the selection.

Returns

Type
System.Boolean

ClearRowHeader()

Clears the row header state based on the current row .

Declaration

protected void ClearRowHeader()

Remarks

This method helps to update the visual state of row header based on current row.

ClearSelections(Boolean, Boolean)

Clears the selected cells or rows in SfDataGrid.

Declaration

public abstract void ClearSelections(bool exceptCurrentRow, bool isProgrammatic = true)

Parameters

Type	Name	Description
System.Boolean	exceptCurrentRow	Decides whether the current selection can be cleared or not.
System.Boolean	isProgrammatic	Decides whether to raise events when the selection is cleared pogrammatically.

CommitAddNew(Boolean)

Commits the new item initialized on the AddNewRow to the underlying data source.

Declaration

protected abstract void CommitAddNew(bool changeState = true)

Parameters

Type	Name	Description
System.Boolean	changeState	Indicates whether watermark is enabled on the AddNewRow.

CreateCurrentCellManager()

Creates the current cell and manages the current cell related operations in SfDataGrid.

Declaration

protected virtual GridCurrentCellManager CreateCurrentCellManager()

Returns

Type	Description
GridCurrentCellManager	Returns the corresponding GridCurrentCellManager instance.

Dispose()

Releases all resources used by the GridBaseSelectionController class.

Declaration

public void Dispose()

Dispose(Boolean)

Disposes all the resources used by the GridBaseSelectionController class.

Declaration

protected virtual void Dispose(bool isDisposing)

Parameters

Type	Name	Description
System.Boolean	isDisposing	Indicates whether the call is from Dispose method or from a finalizer.

GetCurrentDetailsViewGrid(SfDataGrid)

Gets the current DetailsViewDataGrid that contains the current cell.

Declaration

public SfDataGrid GetCurrentDetailsViewGrid(SfDataGrid parentGrid)

Parameters

Type	Name	Description
SfDataGrid	parentGrid	Indicates the corresponding parent grid.

Returns

Type	Description
SfDataGrid	Returns the corresponding DetailsViewDataGrid that contains the current cell.

GetGridSelectedRow(Int32)

Gets the selected row information based on the specified row index.

Declaration

public GridRowInfo GetGridSelectedRow(int rowIndex)

Parameters

Type	Name	Description
System.Int32	rowIndex	The corresponding row index to get selected row information.

Returns

Type	Description
GridRowInfo	Returns the selected row information.

HandleCollectionChanged(NotifyCollectionChangedEventArgs, CollectionChangedReason)

Handles the selection when the SelectedItems, Columns and DataSource property collection changes.

Declaration

public abstract void HandleCollectionChanged(NotifyCollectionChangedEventArgs e, CollectionChangedReason reason)

Parameters

Type	Name	Description
System.Collections.Specialized.NotifyCollectionChangedEventArgs	e	The System.Collections.Specialized.NotifyCollectionChangedEventArgs that contains data for collection changes.
CollectionChangedReason	reason	The CollectionChangedReason contains reason for the collection changes.

Remarks

This method is called when the collection changes on SelectedItems, Columns and DataSource properties in SfDataGrid.

HandleDetailsViewGridKeyDown(KeyEventArgs)

Handles the selection for the keyboard interactions that are performed in DetailsViewDataGrid.

Declaration

public abstract bool HandleDetailsViewGridKeyDown(KeyEventArgs args)

Parameters

Type	Name	Description
System.Windows.Input.KeyEventArgs	args	Contains information about the key that was pressed.

Returns

Type	Description
System.Boolean	true if the key should be handled in DetailsViewDataGrid; otherwise, false.

HandleGridOperations(GridOperationsHandlerArgs)

Handles selection when any of the GridOperation such as sorting, filtering, grouping and etc performed in SfDataGrid.

Declaration

public virtual void HandleGridOperations(GridOperationsHandlerArgs args)

Parameters

Type	Name	Description
GridOperationsHandlerArgs	args	The GridOperationsHandlerArgs that contains the type of grid operations and its arguments.

Remarks

This method is called when any of the GridOperation are performed in SfDataGrid.

HandleGroupExpandCollapse(Int32, Int32, Boolean)

Handles the selection when the group is expanded or collapsed in SfDataGrid.

Declaration

public abstract void HandleGroupExpandCollapse(int index, int count, bool isExpanded)

Parameters

Type	Name	Description
System.Int32	index	The corresponding index of the group.
System.Int32	count	The number of rows that are collapsed or expanded.
System.Boolean	isExpanded	Specifies whether the group is expanded or not.

Remarks

This method is invoked when the group is expanded or collapsed.

HandleKeyDown(KeyEventArgs)

Handles the selection for the keyboard interactions that are performed in SfDataGrid.

Declaration

public abstract bool HandleKeyDown(KeyEventArgs args)

Parameters

Type	Name	Description
System.Windows.Input.KeyEventArgs	args	Contains information about the key that was pressed.

Returns

Type	Description
System.Boolean	true if the key should be handled in SfDataGrid; otherwise, false.

HandlePointerOperations(GridPointerEventArgs, RowColumnIndex)

Handles selection when any of the PointerOperation such as pressed,released,moved,and etc performed in SfDataGrid.

Declaration

public abstract void HandlePointerOperations(GridPointerEventArgs args, RowColumnIndex rowColumnIndex)

Parameters

Type	Name	Description
GridPointerEventArgs	args	The GridPointerEventArgs that contains the type of pointer operations and its arguments.
RowColumnIndex	rowColumnIndex	The corresponding rowColumnIndex of the cell.

Remarks

This method is invoked when any of the PointerOperation are performed in SfDataGrid.

HandleSelectionPropertyChanges(SelectionPropertyChangedHandlerArgs)

Handles selection when the selection property such as SelectedIndex,SelectedItem and SelectionMode value changes occurred.

Declaration

public virtual void HandleSelectionPropertyChanges(SelectionPropertyChangedHandlerArgs handle)

Parameters

Type	Name	Description
SelectionPropertyChangedHandlerArgs	handle	The SelectionPropertyChangedHandlerArgs that contains the corresponding property name and its value changes.

Remarks

This method is invoked when the selection property values such as SelectedIndex,SelectedItem and SelectionMode are changed in SfDataGrid.

MoveCurrentCell(RowColumnIndex, Boolean)

Moves the current cell to the specified rowColumnIndex.

Declaration

public abstract void MoveCurrentCell(RowColumnIndex rowColumnIndex, bool needToClearSelection = true)

Parameters

Type	Name	Description
RowColumnIndex	rowColumnIndex	Specifies the corresponding rowColumnIndex to move the current cell.
System.Boolean	needToClearSelection	Decides whether the current selection is cleared while moving the current cell.

Remarks

This method is not applicable when the SelectionUnit and NavigationMode is Row.

OnPropertyChanged(String)

Invoked when the property value changes in GridBaseSelectionController class.

Declaration

protected virtual void OnPropertyChanged(string propertyName)

Parameters

Type	Name	Description
System.String	propertyName	The property name.

ProcessCurrentItemChanged(SelectionPropertyChangedHandlerArgs)

Processes the selection when the CurrentItem property value changes.

Declaration

protected virtual void ProcessCurrentItemChanged(SelectionPropertyChangedHandlerArgs handle)

Parameters

Type	Name	Description
SelectionPropertyChangedHandlerArgs	handle	The SelectionPropertyChangedHandlerArgs contains the data for the CurrentItem property value changes.

ProcessDetailsViewCurrentItemChanged()

Processes the selection when the CurrentItem property value changes in DetailsViewDataGrid.

Declaration

protected void ProcessDetailsViewCurrentItemChanged()

Remarks

This method remove the selection from its parent grid when the SelectionMode is Single. For Multiple or Extended , the current cell is reset from parent grid to child grid.

ProcessDragSelection(MouseEventArgs, RowColumnIndex)

Processes the selection when the dragging operation is performed on the SfDataGrid.

Declaration

protected abstract void ProcessDragSelection(MouseEventArgs args, RowColumnIndex rowColumnIndex)

Parameters

Type	Name	Description
System.Windows.Input.MouseEventArgs	args	Contains data for mouse events.
RowColumnIndex	rowColumnIndex	The corresponding row and column index to perform drag selection.

Remarks

This method will be raised when the SelectionMode is Multiple or Extended.

ProcessNavigationModeChanged(SelectionPropertyChangedHandlerArgs)

Processes the selection when the NavigationMode property value changes.

Declaration

protected virtual void ProcessNavigationModeChanged(SelectionPropertyChangedHandlerArgs handle)

Parameters

Type	Name	Description
SelectionPropertyChangedHandlerArgs	handle	The SelectionPropertyChangedHandlerArgs contains the data for the NavigationMode property value changes.

ProcessOnAddNewRow(AddNewRowOperationHandlerArgs)

Processes the selection when new row is initiated or committed and the position of AddNewRow is changed.

Declaration

protected abstract void ProcessOnAddNewRow(AddNewRowOperationHandlerArgs handle)

Parameters

Type	Name	Description
AddNewRowOperationHandlerArgs	handle	Contains data for the AddNewRow operation.

ProcessOnFilterApplied(GridFilteringEventArgs)

Processes the selection when the filtering is applied in SfDataGrid.

Declaration

protected abstract void ProcessOnFilterApplied(GridFilteringEventArgs args)

Parameters

Type	Name	Description
GridFilteringEventArgs	args	Contains the data related to filtering operation.

ProcessOnFilterPopupOpened()

Processes the selection when the filter popup is opened.

Declaration

protected abstract void ProcessOnFilterPopupOpened()

Remarks

This method refreshes the selection while opening the filter popup in SfDataGrid.

ProcessOnFilterRowPositionChanged(DependencyPropertyChangedEventArgs)

Processes the selection when the position of FilterRow is changed.

Declaration

protected abstract void ProcessOnFilterRowPositionChanged(DependencyPropertyChangedEventArgs args)

Parameters

Type	Name	Description
System.Windows.DependencyPropertyChangedEventArgs	args	Contains data for the FilterRow position changed.

ProcessOnGroupChanged(GridGroupingEventArgs)

Processes the selection when the column is grouped in SfDataGrid.

Declaration

protected abstract void ProcessOnGroupChanged(GridGroupingEventArgs args)

Parameters

Type	Name	Description
GridGroupingEventArgs	args	Contains the data for collection changes during grouping action.

Remarks

This method refreshes the selection while grouping the column in SfDataGrid.

ProcessOnPageChanged()

Processes the selection while navigating from one page in to another page in SfDataPager.

Declaration

protected abstract void ProcessOnPageChanged()

ProcessOnPaste(List<Object>)

Processes the selection when the records is pasted on SfDataGrid.

Declaration

protected abstract void ProcessOnPaste(List<object> records)

Parameters

Type	Name	Description
System.Collections.Generic.List<System.Object>	records	Contains the list of records that is pasted in to SfDataGrid.

ProcessOnRowHeaderChanged()

Processes the selection when the property value changes.

Declaration

public virtual void ProcessOnRowHeaderChanged()

ProcessOnSortChanged(SortColumnChangedHandle)

Processes the selection when the column is sorted in SfDataGrid.

Declaration

protected abstract void ProcessOnSortChanged(SortColumnChangedHandle sortcolumnHandle)

Parameters

Type	Name	Description
SortColumnChangedHandle	sortcolumnHandle	Contains information related to the sorting action.

Remarks

This method refreshes the selection while sorting the column in SfDataGrid and clear the selection in summary rows.

ProcessOnStackedHeaderRows(StackedHeaderCollectionChangedEventArgs)

Processes the selection when the stacked header collection changes in SfDataGrid.

Declaration

protected abstract void ProcessOnStackedHeaderRows(StackedHeaderCollectionChangedEventArgs args)

Parameters

Type	Name	Description
StackedHeaderCollectionChangedEventArgs	args	Contains data for stacked header collection changes.

ProcessSelectedIndexChanged(SelectionPropertyChangedHandlerArgs)

Processes the selection when the SelectedIndex property value changes.

Declaration

protected virtual void ProcessSelectedIndexChanged(SelectionPropertyChangedHandlerArgs handle)

Parameters

Type	Name	Description
SelectionPropertyChangedHandlerArgs	handle	The SelectionPropertyChangedHandlerArgs contains the data for the SelectedIndex property value changes.

ProcessSelectedItemChanged(SelectionPropertyChangedHandlerArgs)

Processes the selection when the SelectedItem property value changes.

Declaration

protected virtual void ProcessSelectedItemChanged(SelectionPropertyChangedHandlerArgs handle)

Parameters

Type	Name	Description
SelectionPropertyChangedHandlerArgs	handle	The SelectionPropertyChangedHandlerArgs contains the data for the SelectedItem property value changes.

ProcessSelectionModeChanged(SelectionPropertyChangedHandlerArgs)

Processes the selection when the SelectionMode property value changes.

Declaration

protected virtual void ProcessSelectionModeChanged(SelectionPropertyChangedHandlerArgs handle)

Parameters

Type	Name	Description
SelectionPropertyChangedHandlerArgs	handle	The SelectionPropertyChangedHandlerArgs contains the data for the SelectionMode property changes.

ProcessTableSummaryChanged(TableSummaryPositionChangedEventArgs)

Processes the selection when the table summary row position is changed.

Declaration

protected abstract void ProcessTableSummaryChanged(TableSummaryPositionChangedEventArgs args)

Parameters

Type	Name	Description
TableSummaryPositionChangedEventArgs	args	Contains the data for the table summary row position changes.

ProcessUnBoundRowChanged(UnBoundDataRowCollectionChangedEventArgs)

Processes the selection when the UnBoundRow collection changes.

Declaration

protected abstract void ProcessUnBoundRowChanged(UnBoundDataRowCollectionChangedEventArgs args)

Parameters

Type	Name	Description
UnBoundDataRowCollectionChangedEventArgs	args	Contains data for the UnBoundRow collection changes.

RaiseSelectionChanged(List<Object>, List<Object>)

Raises the SelectionChanged event.

Declaration

protected void RaiseSelectionChanged(List<object> addedItems, List<object> removedItems)

Parameters

Type	Name	Description
System.Collections.Generic.List<System.Object>	addedItems	Contains the items that were selected.
System.Collections.Generic.List<System.Object>	removedItems	Contains the items that were unselected.

RaiseSelectionChanging(List<Object>, List<Object>)

Raises the SelectionChanging event in SfDataGrid.

Declaration

protected bool RaiseSelectionChanging(List<object> addedItems, List<object> removedItems)

Parameters

Type	Name	Description
System.Collections.Generic.List<System.Object>	addedItems	Contains the items that were selected.
System.Collections.Generic.List<System.Object>	removedItems	Contains the items that were unselected.

Returns

Type	Description
System.Boolean	Returns true if the SelectionChanging is raised; otherwise, false.

ResumeUpdates()

Resumes usual selection operation in SfDataGrid

Declaration

protected void ResumeUpdates()

ScrollInViewFromBottom(Int32, Key)

Scrolls the specified row index from the bottom to top direction of view in SfDataGrid.

Declaration

protected void ScrollInViewFromBottom(int rowIndex, Key pressedKey)

Parameters

Type	Name	Description
System.Int32	rowIndex	The corresponding row index to scroll the row.
System.Windows.Input.Key	pressedKey	The corresponding key that was pressed.

Remarks

This method helps to scroll the row into view when the row is not present in the view area of SfDataGrid.

ScrollInViewFromTop(Int32, Key)

Scrolls the specified row index from top to bottom direction of view in SfDataGrid.

Declaration

protected void ScrollInViewFromTop(int rowIndex, Key pressedKey)

Parameters

Type	Name	Description
System.Int32	rowIndex	The corresponding row index to scroll the row
System.Windows.Input.Key	pressedKey	The corresponding key that was pressed.

Remarks

This method helps to scroll the row into view when the row is not present in the view area of SfDataGrid.

ScrollToRowIndex(Int32)

Scrolls the specified row index to view in SfDataGrid.

Declaration

protected void ScrollToRowIndex(int rowIndex)

Parameters

Type	Name	Description
System.Int32	rowIndex	The corresponding row index to scroll the row.

Remarks

This method helps to scroll the row into view when the row is not present in the view area of SfDataGrid. If the rowIndex is DetailsViewDataRow, the current row index of the particular DetailsViewDataGrid will be scrolled to view.

SelectAll(Boolean)

Selects all the cells in SfDataGrid.

Declaration

public abstract void SelectAll(bool canFocus = true)

Parameters

Type	Name	Description
System.Boolean	canFocus	Decides whether the focus can be set to the current cell.

Remarks

This method only works if the is Multiple or Extended.

SelectRows(Int32, Int32)

Selects the rows corresponding to the specified start and end index of the row.

Declaration

public abstract void SelectRows(int startRowIndex, int endRowIndex)

Parameters

Type	Name	Description
System.Int32	startRowIndex	The start index of the row to select.
System.Int32	endRowIndex	The end index of the row to select.

SetPressedIndex(RowColumnIndex)

Sets the PressedRowColumnIndex of SfDataGird.

Declaration

protected virtual void SetPressedIndex(RowColumnIndex rowcolumnIndex)

Parameters

Type	Name	Description
RowColumnIndex	rowcolumnIndex	Indicates the starting position of drag selection.

Remarks

This method helps to initialize the starting position of drag selection.

SuspendUpdates()

Temporarily suspends the updates for the selection operation in SfDataGrid.

Declaration

protected void SuspendUpdates()

UnWireEvents()

Unwires the events associated with selection operation in SfDataGrid.

Declaration

protected virtual void UnWireEvents()

WireEvents()

Wires the events associated with selection operation in SfDataGrid.

Declaration

protected virtual void WireEvents()

Events

PropertyChanged

Occurs when a property value changes in GridBaseSelectionController class.

Declaration

public event PropertyChangedEventHandler PropertyChanged

Event Type

Type
System.ComponentModel.PropertyChangedEventHandler

Implements

IGridSelectionController

System.ComponentModel.INotifyPropertyChanged

System.IDisposable