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NextGrid & NextDBGrid

• Integrating Inplace Editors
• Upgrade existing projects for loading changes
• FieldChooser Tutorial
• NextGrid How To
• Html Column Tutorial
• NextGrid Slide Style Tutorial
• InputLine Tutorial
• Edit events in NextGrid
• NextGrid Vista Style

NextGrid

• NextGrid Quick Start
• Graphic Column Tutorial
• Optimize NextGrid
• Custom Draw in NextGrid
• VirtualColumn Tutorial
• NextGrid Custom Sorting
• TreeColumn Tutorial

NextDBGrid

• NextDBGrid Events
• NextDBGrid Quick Start
• LookupColumn Tutorial

NextInspector

• NextInspector Item Types
• NextInspector Quick Start
• NextDBInspector Tutorial
• NextInspector Advanced tutorial
• Map VCL property to item

NextSheet

• Formating in NextSheet
• NextSheet Sample Project
• NextSheet Quick Start

NextCollection

• NxInfoPanel Tutorial
• NxPathControl and NxNotebook tutorial
• NxAlertWindow Tutorial
• NxPathControl Quick Start
• NxButton Tutorial
• NxOutlookBar Tutorial
• NxFlipPanel and NxHeaderPanel Quick Start
• NxPageControl and NxNotebook Quick Start

Misc

• DateTime FormatMask
• NxAutoCompletion Tutorial
• Using NxColorScheme
• NxComboBox styles
• Enable typing unicode characters in InplaceEditors
• NxProgress Tutorial
• NxPreview Quick Start
• Numeric FormatMask
• Component Names Change
• 32bit Bitmaps Tutorial

Labs

• NxReport Project

Related Articles:

In this tutorial we will demonstrate how to create tree inside Next Grid.

Please note that Tree Column implementation is still in stage and we work to improve it constantly.

Adding TreeColumn

TreeColumn (TNxTreeColumn) is normal NextGrid column and can be added at any place inside Grid, any times needed.

To add one TNxTreeColumn, click on TreeColumn icon:

Customizing TreeColumn

TreeColumn appearance can be customized with following properties:

ExpandLock - Disable clicking on and buttons.

ShowLines - Show/Hide Tree Lines.

ShowButtons - Show/Hide and buttons.

Adding Rows

Tree structure can be build with AddChildRow and InsertChildRows methods.

AddChildRow method have following parameters:

Table 1: AddChildRow Parameters

Name	Type	Meaning
Index	Integer	Index of Parent Row.
Position (optional)	Integer	Position of Child Row (crFirst - new row will be first child row, crLast - new row will be last child row

with NextGrid1 do
begin
  AddRow;
  Cells[0, LastAddedRow] := '[root]';
  AddChildRow(0);
  Cells[0, LastAddedRow] := 'two';
  AddChildRow(0);
  Cells[0, LastAddedRow] := 'one';
  AddChildRow(0);
  Cells[0, LastAddedRow] := 'three';
  AddChildRow(LastAddedRow);
  Cells[0, LastAddedRow] := 'one more child row';
end;

Result:



In this sample we have use property LastAddedRow to determine Index of last added row inside Grid.

Deleting Rows

Child row may be deleted with using DeleteRow method and with sending Row's absolute index as parameter:

DeleteRow(AbsoluteIndexOfRow);

To delete child row, without knowing absolute index, use DeleteChildRow method:

DeleteChildRow(ParentIndex, Index);

Table 2: DeleteChildRow Parameters

Name	Type	Meaning
ParentIndex	Integer	Determine absolute index of parent row
Index	Integer	determine relative index of child row inside Parent row.

Working with Nodes

NextGrid also have several methods for easy working with Nodes.

GetNextSibling returns the next row (node) in the tree at the same level as the calling row.

GetPrevSibling returns the previous row (node) in the tree at the same level as the calling row.