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3.0

Not just collapse the whole treeview but show only the main folders.

Asked by peterkiers in Delphi Programming

Dear Experts,

I have an application with a treeview, a richedit and 2 buttons on it.
The buttons are for making a file-node and a folder node in a treeview.
The treeview-nodes along with the text that will be displayed on the
richedit are being saved and loaded to a database.

My application works great, only one little detail that is not correct.
When I open a file(database) with my application it collapses the whole tree.
and I want just de main-folders. In the first picture I have put an example
of another programm that has it right, and the second picture is my application.
You can see the diffirence. Who can help me to solve this problem.

I have only put the code in the code-section that I think is relevant.

Greetings,

Peter Kiers

View the Solution FREE for 30 Days

         
           
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             (*---------------------------------------------------*)
function CustomSortProc(Node1, Node2: TTreeNode; Data: Integer): Integer; stdcall;
begin
 if Node1.ImageIndex<>Node2.ImageIndex Then 
  begin
   if Node1.ImageIndex=Item_Image_Index Then Result:=-1 Else Result:=1;
  end Else
  Result:=AnsiCompareText(Node1.Text, Node2.Text);
end;
(*---------------------------------------------------*)
function TMainForm.FindNode(ni: integer): TTreeNode;
Var
 i:integer;
begin
 With treeview1 do for i := 0 to Items.Count - 1 do if ni=Integer(Items[i].Data) then
  begin
   Result:=Items[i];
   Exit;
  end;
 Result:=nil;
end;
(*---------------------------------------------------*)
procedure TMainForm.FormCreate(Sender: TObject);
var
  I: Integer;
  SOToken: ISpeechObjectToken;
  SOTokens: ISpeechObjectTokens;
begin
  DBPath := IncludeTrailingPathDelimiter(ExtractFilePath(Application.Exename));
  DBName := 'dbtree.pkr';
  Caption :='Untitled - IT Knowledgebase';
  PageControl1.ActivePage := Tabsheet1;
  OpenDatabase;
end;
(*---------------------------------------------------*)
procedure TMainForm.FormDestroy(Sender: TObject);
var
  I: Integer;
begin
 AdoTable1.First;
  for I := 0 to cbVoices.Items.Count - 1 do
    ISpeechObjectToken(Pointer(cbVoices.Items.Objects[I]))._Release;
end;
(*---------------------------------------------------*)
procedure TMainForm.LoadTree;
Var
  i:integer;
  n,n2:TTreeNode;
begin
 ADOTable1.First;
 With TreeView1 do
  begin
   Items.BeginUpdate;
   Items.Clear;
   while Not ADOTable1.Eof do
    begin
     n2:=FindNode(ADOTable1Parent.Value);
     n:=Items.AddChild(n2,ADOTable1Name.Value);
     n.ImageIndex:=ADOTable1Image_Index.Value;
     if n.ImageIndex = FolderClose_Image_Index
        Then n.SelectedIndex:=FolderOpen_Image_Index
        Else n.SelectedIndex:=n.ImageIndex;
     n.Data:=Pointer(ADOTable1ID.Value);
     ADOTable1.Next;
    end;
   for i:=0 to Items.Count-1 do Items[i].Expand(True);
      CustomSort(@CustomSortProc, 0);
   Items.EndUpdate;
  end;
  With TreeView1 do if Items.Count>0 Then Selected:=Items[0];
end;
(*---------------------------------------------------*)
procedure TMainForm.New1Click(Sender: TObject);
begin
  Caption :='Untitled - IT Knowledgebase';
  DBPath := IncludeTrailingPathDelimiter(ExtractFilePath(Application.Exename));
  DBName := 'dbtree.pkr';
  OpenDatabase;
end;
(*---------------------------------------------------*)
procedure TMainForm.NewFolder1Click(Sender: TObject);
Var
 n,n2:TTreeNode;
 NewText:String;
begin
 if (TreeView1.Selected<>nil) And (TreeView1.Selected.ImageIndex = Item_Image_Index ) Then Exit;
 NewText:=InputBox('New Folder','Folder Name','');
 if NewText='' Then Exit;
 n2:=TreeView1.Selected;
 n:=TreeView1.Items.AddChild(n2,NewText);    
 n.ImageIndex:=FolderClose_Image_Index;
 n.SelectedIndex:=FolderOpen_Image_Index;
 TreeView1.Selected:=nil;
 ADOTable1.Insert;
 ADOTable1Status.Value:=0;
 ADOTable1Name.Value:=n.Text;
 ADOTable1Image_Index.Value:=FolderClose_Image_Index;
 if Assigned(n2)
  Then ADOTable1Parent.Value:=Integer(n2.Data)
  Else ADOTable1Parent.Value:=0;
 ADoTable1.Post;
 n.Data:=Pointer(ADOTable1ID.Value);
 TreeView1.Selected:=n;
 if n.Parent=nil
  Then TreeView1.CustomSort(@CustomSortProc, 0,False)
  Else n.Parent.CustomSort(@CustomSortProc, 0,False);
end;
(*---------------------------------------------------*)
procedure TMainForm.NewItem1Click(Sender: TObject);
Var
 n,n2:TTreeNode;
 NewText:String;
begin
 if (TreeView1.Selected=nil) Or (TreeView1.Selected.ImageIndex <> FolderClose_Image_Index) Then Exit;
 NewText:=InputBox('New Item','Item Name','');
 if NewText='' Then Exit;
 n2:=TreeView1.Selected;
 n:=TreeView1.Items.AddChild(n2,NewText);
 n.ImageIndex:=Item_Image_Index;
 n.SelectedIndex:=Item_Image_Index;
 TreeView1.Selected:=nil;
 ADOTable1.Insert;
 ADOTable1Status.Value:=0;
 ADOTable1Name.Value:=n.Text;
 ADOTable1Image_Index.Value:=Item_Image_Index;
 if Assigned(n2)
  Then ADOTable1Parent.Value:=Integer(n2.Data)
  Else ADOTable1Parent.Value:=0;
 ADoTable1.Post;
 n.Data:=Pointer(ADOTable1ID.Value);
 TreeView1.Selected:=n;
 if n.Parent=nil
  Then TreeView1.CustomSort(@CustomSortProc, 0,False)
  Else n.Parent.CustomSort(@CustomSortProc, 0,False);
end;
(*---------------------------------------------------*)
procedure TMainForm.Open1Click(Sender: TObject);
var
  sFileName: String;
begin
  OpenDialog1.InitialDir := DBPath;
  if OpenDialog1.Execute then
  begin
    DBName := ExtractFileName(OpenDialog1.FileName);
    DBPath := ExtractFilePath(OpenDialog1.FileName);
    sFileName := OpenDialog1.FileName;
    MainForm.Caption := ExtractFileName(OpenDialog1.FileName) + ' - ' + 'IT Knowledgebase';
    updateRecent(sFileName);
    OpenDatabase;
  end;
end;
(*---------------------------------------------------*)
procedure TMainForm.OpenDatabase;
var
  conn_str:string;
begin
  conn_str :=
    Format('provider=Microsoft.Jet.OLEDB.4.0;Persist Security Info=False;Data Source=%s%s;',
    [IncludeTrailingPathDelimiter(DBPath), DBName]);
  ADOConnection1.Connected := False;
  ADOConnection1.ConnectionString := conn_str;
  ADOConnection1.Connected := True;
  ADOTable1.Open;
  LoadTree;
end;
(*---------------------------------------------------*)
procedure TMainForm.TreeView1Change(Sender: TObject; Node: TTreeNode);
Var
 V:Variant;
 e:Boolean;
begin
 if Assigned(TreeView1.Selected) then
  begin
   V:=Integer(TreeView1.Selected.Data);
   if V>0 then ADOTable1.Locate('ID',V,[]);
   e:=TreeView1.Selected.ImageIndex=Item_Image_Index;
  end Else e:=False;
 DbRichEdit1.Enabled:=e;
 DbRichEdit2.Enabled:=e;
end;
(*---------------------------------------------------*)
procedure TMainForm.TreeView1Editing(Sender: TObject; Node: TTreeNode;
  var AllowEdit: Boolean);
begin
  AllowEdit := Node.Parent <> nil;
end;
(*---------------------------------------------------*)
           
         

Attachments:

Example1.jpg (5 KB) (File Type Details)

Example1

Example2.jpg (6 KB) (File Type Details)

Example2

20091021-EE-VQP-81 - Hierarchy / EE_QW_3_20080625

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Not just collapse the whole treeview but show only the main folders.

Asked by peterkiers in Delphi Programming

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