Renaming a treeview node

Peter Kiers
Peter Kiers used Ask the Experts™
on
Dear Experts,

I have made a little programm that has a Treeview, a RichEdit.
and 4 buttons on a Panel. 2 buttons are for loading and saving
the treeview nodes with its associating text on the RichtEdit
to a database. The other 2 buttons are for creating a Folder-node
and a File-node in the Treeview. Everything works perfect.

Now I want to make a new button on the panel for renaming
a node in the Treeview. how can i do that?

Grtz, Peter Kiers

unit Unit1;
 
interface
 
uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, DB, ADODB, ComCtrls, StdCtrls, ImgList, ExtCtrls;
 
type
  TForm1 = class(TForm)
    TreeView1: TTreeView;
    Splitter1: TSplitter;
    Panel1: TPanel;
    Button1: TButton;
    Button2: TButton;
    ADOQuery1: TADOQuery;
    ADOConnection1: TADOConnection;
    FolderBtn: TButton;
    FileBtn: TButton;
    ImageList1: TImageList;
    RichEdit1: TRichEdit;
    Button3: TButton;
    procedure Button3Click(Sender: TObject);
    procedure RichEdit1KeyUp(Sender: TObject; var Key: Word;
      Shift: TShiftState);
    procedure FolderBtnClick(Sender: TObject);
    procedure FileBtnClick(Sender: TObject);
    procedure TreeView1Change(Sender: TObject; Node: TTreeNode);
    procedure FormCreate(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    procedure Button1Click(Sender: TObject);
    
  private
    { Private declarations }
    procedure savetree(t: ttreeview);
    procedure loadtree(t: TTreeView);
    procedure saveNode(n: TTreeNode);
    function findNode(t:TTreeView; id: integer): TTreeNode;
    procedure AddItem(aText: string; aIndex: Integer; aParent: TTreeNode);
  public
    { Public declarations }
  end;
 
var
  Form1: TForm1;
 
implementation
 
{$R *.dfm}
 
type
  TItem = class(TObject)
  private
    fStatus: byte;
    fParentID: integer;
    fNodeText: string;
    fID: integer;
    fData: string;
    fSaver: TAdoQuery;
    fChanged: Boolean;        
    fSaveImmediate: boolean;
    fIsNew: Boolean;
    fImageIndex: integer;
    procedure SetData(const Value: string);
    procedure SetNodeText(const Value: string);
    procedure SetParentID(const Value: integer);
    procedure SetStatus(const Value: byte);
    procedure SetImageIndex(const Value: integer);
  protected
    procedure Changed; dynamic;
  public
    constructor Create(aSaver: TAdoQuery; AId, AParentID: integer; AStatus: byte);
    constructor LoadFromDataset(aSaver: TAdoQuery);
    procedure BeginUpdate;
    procedure EndUpdate;
    procedure Delete;
    procedure Save;
  published
    property ID: integer read fID write fID;
    property ParentID: integer read fParentID write SetParentID;
    property ImageIndex: integer read fImageIndex write SetImageIndex;
    property Status: byte read FStatus write SetStatus;
    property Data: string read fData write SetData;
    property NodeText: string read fNodeText write SetNodeText;
  end;
 
{ TItem }
 
procedure TItem.BeginUpdate;
begin
  fSaveImmediate := false;                 
end;
(*---------------------------------------------------*)
procedure TItem.Changed;
begin
  fChanged := True;
  if fSaveImmediate then Save;
end;
(*---------------------------------------------------*)
constructor TItem.Create(aSaver: TAdoQuery; AId, AParentID: integer;
  AStatus: byte);
begin
  inherited Create;
  fChanged := False;
  fSaveImmediate := True;
  fIsNew := True;
  fSaver := aSaver;
  fID := AID;
  fParentID := AParentID;
  fStatus := AStatus;
  fNodeText := '';
  fData := '';
end;
(*---------------------------------------------------*)
procedure TItem.Delete;
begin
//
end;
(*---------------------------------------------------*)
procedure TItem.EndUpdate;
begin
  fSaveImmediate := True;
  if fChanged then Save;
end;
(*---------------------------------------------------*)
constructor TItem.LoadFromDataset(aSaver: TAdoQuery);
begin
  Create(aSaver, 0, 0, 0);
  if not aSaver.IsEmpty then
  begin
    fId := aSaver.FieldByName('ID').AsInteger;
    fParentID := aSaver.FieldByName('PARENT').AsInteger;
    fStatus := aSaver.FieldByName('STATUS').AsInteger;
    fNodeText := aSaver.FieldByName('NAME').AsString;
    if aSaver.FindField('DATA') <> nil then
      fData := aSaver.FieldByName('DATA').AsString;
    fImageIndex := aSaver.FieldByName('IMAGE_INDEX').AsInteger;
    fIsNew := False;
  end;
end;
(*---------------------------------------------------*)
procedure TItem.Save;
begin
  if fIsNew then
    fSaver.SQL.Text :=
      'insert into tree (parent, name, status, image_index, data) values (:v1, :v2, :v3, :v4, :v5)'
  else
    fSaver.SQL.Text :=
      'update tree set parent = :v1, name = :v2, status = :v3, image_index = :v4, data = :v5 where id = :v6';
  fSaver.Parameters.ParamByName('v1').Value := fparentID;
  fSaver.Parameters.ParamByName('v2').Value := fNodeText;
  fSaver.Parameters.ParamByName('v3').Value := fStatus;
  fSaver.Parameters.ParamByName('v4').Value := fImageIndex;
  fSaver.Parameters.ParamByName('v5').Value := fData;
  if not fIsNew then
    fSaver.Parameters.ParamByName('v6').Value := fId;
  fSaver.ExecSQL;
  if fIsNew then
  begin
    fSaver.SQL.Text :=
      'SELECT id from tree order by id desc';
    fSaver.Open;
    fId := fSaver.FieldByName('ID').asInteger;
    fSaver.Close;
    fIsNew := False;
  end;
  fChanged := False;
end;
(*---------------------------------------------------*)
procedure TItem.SetData(const Value: string);
begin
  if fData <> Value then
  begin
    fData := Value;
    Changed;
  end;
end;
(*---------------------------------------------------*)
procedure TItem.SetImageIndex(const Value: integer);
begin
  if fImageIndex <> Value then
  begin
    fImageIndex := Value;
    Changed;
  end;
end;
(*---------------------------------------------------*)
procedure TItem.SetNodeText(const Value: string);
begin
  if fNodeText <> Value then
  begin
    fNodeText := Value;
    Changed;
  end;
end;
(*---------------------------------------------------*)
procedure TItem.SetParentID(const Value: integer);
begin
  if fParentId <> Value then
  begin
    fParentID := Value;
    Changed;
  end;
end;
(*---------------------------------------------------*)
procedure TItem.SetStatus(const Value: byte);
begin
  if fStatus <> Value then
  begin
    FStatus := Value;
    Changed;
  end;
end;
(*---------------------------------------------------*)
procedure TForm1.AddItem(aText: string; aIndex: Integer; aParent: TTreeNode);
var n: TTreeNode;
  data: TItem;
  parentId: integer;
begin
  parentId := 0;
  if (aParent <> nil) and (TItem(aParent.Data) <> nil) then
    parentId := TItem(aParent.Data).ID;
  data := TItem.Create(AdoQuery1, -1, parentId, 0);
  data.NodeText := aText;
  data.ImageIndex := aIndex;
  n := TTreeNode.Create(TreeView1.Items);
  n.Text := data.NodeText;
  n.ImageIndex := data.ImageIndex;
  n.SelectedIndex := data.ImageIndex;
  TreeView1.Items.AddNode(n, aParent, aText, data, naAddChild);
end;
(*---------------------------------------------------*)
procedure TForm1.Button1Click(Sender: TObject);
begin
  loadTree(treeview1);
end;
(*---------------------------------------------------*)
procedure TForm1.Button2Click(Sender: TObject);
begin
  savetree(treeview1);
end;
procedure TForm1.Button3Click(Sender: TObject);
var
   node : TTreeNode;
   mess, str : string;
   key_stat : integer;
begin
    Node := Treeview1.Selected;
    if Assigned(Node) then
       begin
       str := Node.Text;
       mess := 'Are you sure that you want to delete the';
       Case Node.Level of
         0 : mess := mess + ' folder : ' +#13+#13 + str + '   ???' +#13+
                    'All folders, subfolders, items and subitems' +#13+ 'will be permanently deleted !!' +#13;
         1 : mess := mess + ' item : ' +#13+#13 + str + '   ???' + #13;
       end;
       with Application do
         begin
         NormalizeTopMosts;
         key_stat := MessageBox(pchar(mess), '         Confirmation', MB_YESNO);
         RestoreTopMosts;
       end;
       if key_stat = 7 then  Exit;         // 6 - YES ; 7 - N0
       TreeView1.Items.Delete(Treeview1.Selected);
       end
    else ShowMessage('Select a folder in the treeview first.');
end;
(*---------------------------------------------------*)
procedure TForm1.FileBtnClick(Sender: TObject);
var aText: string;
begin
  if (TreeView1.Selected <> nil) and (TreeView1.Selected.ImageIndex = 15) then
  begin
     if InputQuery('File', 'Enter a file name', aText) then
      AddItem(aText, 17, TreeView1.Selected);
  end else
    ShowMessage('Select a folder in the treeview first.');
end;
(*---------------------------------------------------*)
function TForm1.findNode(t: TTreeView; id: integer): TTreeNode;
var i:integer;
begin
  i:=0;
  while (i<t.items.count) and (TItem(t.items[i].data).ID<>id) do
    inc(i);
  if i<t.items.count then result:=t.items[i]
                     else result:=nil;
end;
(*---------------------------------------------------*)
procedure TForm1.FolderBtnClick(Sender: TObject);
var aText: string;
  aParent: TTreeNode;
begin
  aParent := nil;
  if TreeView1.Selected <> nil then
  begin
    if TreeView1.Selected.ImageIndex = 15 then
      aParent := TreeView1.Selected
    else
    begin
      ShowMessage('Select a folder first');
      Exit;
    end;
  end;
  if InputQuery('Folder', 'Enter a folder name', aText) then
    AddItem(aText, 15, aParent);
end;
(*---------------------------------------------------*)
procedure TForm1.FormCreate(Sender: TObject);
var
  conn_str:string;
begin
  conn_str:='provider=Microsoft.Jet.OLEDB.4.0;Persist Security Info=False;Data Source=';
  conn_str:=conn_str+IncludeTrailingPathDelimiter(ExtractFilePath(Application.Exename));
  conn_str:=conn_str+'test.pkd;';
  ADOConnection1.Connected:=False;
  ADOConnection1.ConnectionString:=conn_str;
  ADOConnection1.Connected:=True;
  ADOConnection1.Open;
end;
(*---------------------------------------------------*)
procedure TForm1.loadtree(t: TTreeView);
var
  p, n: TTreeNode;
  data: TItem;
begin
  t.Items.Clear;
  ADOQuery1.SQL.Text := 'select * from tree order by parent asc';
  ADoQuery1.Open;
  while not ADoQuery1.Eof do
  begin
    data := TItem.LoadFromDataset(AdoQuery1);
    p := FindNode(t, data.ParentID);
    n := t.items.AddChildObject(p, data.NodeText, data);
    n.ImageIndex := data.ImageIndex;
    n.SelectedIndex := data.ImageIndex;
    AdoQuery1.Next;
  end;
  AdoQuery1.Close;
end;
(*---------------------------------------------------*)
procedure TForm1.saveNode(n: TTreeNode);
var i, aParent: integer;
  item: TItem;
begin
  item := TItem(n.Data);
  if item <> nil then
  begin
    item.BeginUpdate;
    try
      Item.NodeText := n.Text;
      aParent := 0;
      if (n.Parent <> nil) and (TItem(n.Parent.Data) <> nil) then
        aParent := TItem(n.Parent.Data).ID;
      Item.ParentID := aParent;
      Item.ImageIndex := n.ImageIndex;
    finally
      Item.EndUpdate;
    end;
  end;
  for i := 0 to n.Count-1 do SaveNode(n.Item[i]);
end;
(*---------------------------------------------------*)
procedure TForm1.savetree(t: ttreeview);
var n: TTreeNode;
begin
  n := t.items.getFirstNode;
  while n <> nil do
  begin
    SaveNode(n);
    n := n.getNextSibling;
  end;
end;
(*---------------------------------------------------*)
procedure TForm1.TreeView1Change(Sender: TObject; Node: TTreeNode);
begin
  RichEdit1.Text := '';
  if (Node <> nil) and (Node.ImageIndex = 15) then
    RichEdit1.Text := TItem(Node.Data).Data;
end;
(*---------------------------------------------------*)
procedure TForm1.RichEdit1KeyUp(Sender: TObject; var Key: Word;
  Shift: TShiftState);
  var n: TTreeNode;
begin
        n := TreeView1.Selected;
        if (n <> nil) and (n.ImageIndex = 15) then
        begin
        TItem(n.Data).fSaveImmediate := False;
         TItem(N.Data).Data := RichEdit1.Text;
         end;
end;
(*---------------------------------------------------*)
end.

Open in new window

Comment
Watch Question

Do more with

Expert Office
EXPERT OFFICE® is a registered trademark of EXPERTS EXCHANGE®

procedure TForm1.btnRenameClick(Sender: TObject);
var node : TTreeNode;
     aText : string;
begin
     node := TreeView1.Selected;
     if node <> nil then
          begin
          aText := node.Text;
          if InputQuery('Rename', 'Enter a new name', aText) then
               node.Text := aText;
          end
     else begin
          ShowMessage('You must select a node before it can be renamed.');
          end;
end;

Open in new window

Oracle dba
Top Expert 2009
Commented:
next you will be asking for a separate form instead of the InputQuery
remember me and Developmentguru ?

i'll even modify it so you get the text in the general form readily selected and focused

uses uGenericInput;

procedure TForm1.btnRenameClick(Sender: TObject);
var node : TTreeNode;
     aText, aType : string;
begin
  node := TreeView1.Selected;
  if Assigned(node) then
  begin
    aType := 'folder';
    if node.ImageIndex <> 15 then
      aType := 'file';
    aText := node.Text;
    if GenericInput('Rename ' + aType, aText, 'You must enter a ' + aType + ' name') then
      node.Text := aText;
  end else
    ShowMessage('You must select a node before it can be renamed.');
end;

unit uGenericInput;
 
interface
 
uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls;
 
type
  TGenericInputFrm = class(TForm)
    btnOK: TButton;
    btnCancel: TButton;
    eInput: TEdit;
    procedure btnOKClick(Sender: TObject);
  private
    fErrorMessage: string;
    function GetValue: string;
    procedure SetValue(const Value: string);
  public
    function Validate: boolean; virtual;
    property Value : string read GetValue write SetValue;
  end;
 
var
  GenericInputFrm: TGenericInputFrm;
 
function GenericInput(FormCaption : string; var Input : string; ErrorValidation: string = 'You must enter a folder name') : boolean;
 
implementation
 
function GenericInput(FormCaption : string; var Input : string) : boolean;
var
  NewForm : TGenericInputFrm;
  ok, cancel: Boolean;
begin
  Result := false;
  NewForm := TGenericInputFrm.Create(Application);
  try
    NewForm.fErrorMessage := ErrorValidation;
    NewForm.Value := Input;
    NewForm.Caption := FormCaption;
    NewForm.ActiveControl := eInput;
    NewForm.eInput.SelStart := 0;
    NewForm.eInput.SelLength := Length(Input);
    if NewForm.ShowModal = mrOk then 
    begin
      Result := True;
      Input := NewForm.Value;
    end;
  finally
    NewForm.Free;
  end;
end;
 
{$R *.dfm}
 
{ TGenericInputFrm }
 
function TGenericInputFrm.GetValue: string;
begin
  Result := Trim(eInput.Text);
end;
 
procedure TGenericInputFrm.SetValue(const Value: string);
begin
  eInput.Text := Value;
end;
 
procedure TGenericInputFrm.btnOKClick(Sender: TObject);
begin
  if Validated then 
    ModalResult := mrOk;
end;
 
function TGenericInputFrm.Validated: boolean;
begin
  Result := Value <> '';
  if not Result then 
    MessageDlg(fErrorMessage, mtError, [mbOK], 0);
end;
 
end.

Open in new window

Peter KiersOperator

Author

Commented:
No this time I want to click on the rename button and get
it just like the picture.
test.jpg
Bootstrap 4: Exploring New Features

Learn how to use and navigate the new features included in Bootstrap 4, the most popular HTML, CSS, and JavaScript framework for developing responsive, mobile-first websites.

Peter KiersOperator

Author

Commented:
And the node with Image Index 18 can not be renamed.
Geert GOracle dba
Top Expert 2009

Commented:
just set editing to true for the treeview
click on the text and start editing
why a button ?
Peter KiersOperator

Author

Commented:
Because I have a toolbar with a button on it.

Greetings, Peter Kiers
Here is a way to initiate in-place editing without clicking on the node.
uses CommCtrl // << Make sure to add this to your uses clause
..
..
procedure TForm1.btnRenameClick(Sender: TObject);
begin
     if TreeView1.Selected <> nil then
          TreeView_EditLabel(TreeView1.Handle,TreeView1.Selected.ItemId);
end;

Open in new window

Peter KiersOperator

Author

Commented:
Undeclared identifier: TreeView1_EditLabel
TreeView_EditLabel - not TreeView1_EditLabel
Peter KiersOperator

Author

Commented:
Thanks for everything.

Greetings, Peter Kiers

Do more with

Expert Office
Submit tech questions to Ask the Experts™ at any time to receive solutions, advice, and new ideas from leading industry professionals.

Start 7-Day Free Trial