Collapsable Cell

Represents an expand - collapse cell, useful to display parent-child records.

Namespace: LSOne.Controls.Cells

Assembly: LSOne.Controls.ListView

Syntax

public class CollapsableCell : VirtualCollapsableCell

Constructors

Name	Description
CollapsableCell()	Default constructor. Initializes a new instance of the CollapsableCell class
CollapsableCell(bool)	Initializes a new instance of the CollapsableCell class with the given collapsed state
CollapsableCell(LSOne.Controls.Columns.ColumnCollection, List<LSOne.Controls.Rows.SubRow>)	Initializes a new instance of the CollapsableCell class with the given text and collapsed state
CollapsableCell(LSOne.Controls.Columns.ColumnCollection, List<LSOne.Controls.Rows.SubRow>, bool)	Initializes a new instance of the CollapsableCell class with the given collection of columns, list of SubRows and collapsed state
CollapsableCell(LSOne.Controls.Columns.ColumnCollection, List<LSOne.Controls.Rows.SubRow>, string, bool)	Initializes a new instance of the CollapsableCell class with the given collection of columns, list of SubRows, text and collapsed state
CollapsableCell(LSOne.Controls.Columns.ColumnCollection, List<LSOne.Controls.Rows.SubRow>, string, Image, bool)	Initializes a new instance of the CollapsableCell class with the given collection of columns, list of SubRows, text, image and collapsed state
CollapsableCell(string, bool)	Initializes a new instance of the CollapsableCell class with the given text and collapsed state
CollapsableCell(string, System.Drawing.Image, bool)	Initializes a new instance of the CollapsableCell class with the given text, image and collapsed state

Properties

Name	Description
Columns	Gets or sets the list of child columns
HeaderRowHeight	Gets or sets the header height
Rows	Gets or sets the list of child rows
SubsetID	Gets or sets the subset id (for identifying child records)

Methods

Name	Description
AddSubRows(LSOne.Controls.Columns.ColumnCollection, List<LSOne.Controls.Rows.SubRow>)	Adds child columns and rows
AutoSizeColumns(LSOne.Controls.ListView)	Resizes the columns of the parent control to fit its width
ClearSubRows()	Clears all child columns and rows

Remarks

To display parent-child records in a List View you need to:

• add parent rows to the list view plus the column that will contain the collapsable cell
• implement handler for ListView.RowExpanded event where the child rows are added to the list view
• implement handler for ListView.RowCollapsed event where the child rows are removed from the list view

Examples

 

 

private void LoadItems()
{
	lvItems.ClearRows();
	int itemsCount = 0;
	
	items = service.GetParentItems();
	
	Row row;
	foreach (Item item in items)
	{
		row = new Row();
		
		row.AddCell(new VirtualCollapsableCell((string)item.ID, true));
		row.AddText(item.ItemName);
		
		row.Tag = item;
		
		lvItems.AddRow(row);
	}
}

public void LoadData(bool isRevert, RecordIdentifier context, object internalContext)
{
	LoadItems();
}

private void lvItems_RowExpanded(object sender, RowEventArgs args)
{
	Item parentItem = (Item)lvItems.Row(args.RowNumber).Tag;

	List<Item> subRows = service.GetChildItems();

	int nextRowNumber = args.RowNumber + 1;

	foreach (Item item in subRows)
	{
		Row row = new Row();
		row.AddCell(new ExtendedCell(string.Empty));
		row.AddText((string)item.ItemId);
		row.AddText(item.ItemName);
	
		row.Tag = item;
	
		lvItems.InsertRow(nextRowNumber, row);
		items.Insert(nextRowNumber, item);
	
		nextRowNumber++;
	}

	lvItems.AutoSizeColumns();
}

private void lvItems_RowCollapsed(object sender, RowEventArgs args)
{
	Item parentItem = (Item)lvItems.Row(args.RowNumber).Tag;

	int rowIndex = args.RowNumber + 1;

	while (rowIndex < lvItems.RowCount && parentItem.MasterID == ((Item)lvItems.Row(rowIndex).Tag).ParentMasterID)
	{
		lvItems.RemoveRow(rowIndex);
		items.RemoveAt(rowIndex);
	}

	lvItems.AutoSizeColumns();
}		

See also

• UI Components
• List View
• Search Bar
• Cell