Title: A TMeo that has more than one column and can be sorted
Question: How can I get a TMemo that has more than one colun
and in which I can sort the rown using a THeaderControl
Answer:
Just see the project.
I know the use of a TListView would ease it up a lot
but to me, the tmemo is an underestimated control.
With this, it will have some of the big advantages of a
tlistview and still keep its own functionality....
Here the pas file:
unit Unit1;
{ Combine TMemo with THeaderControl
to achieve a TMemo that:
-- can have more than one Column
-- sort the lines in the TMemo by each of its
columns by clicking on each section of the THeaderControl
Programmed by: Omer Yasar Can - omercan@home.nl
Here, also to learn:
How to create your own class with its own variables and its own
procedures/functions and use it}
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls, ComCtrls;
type
TForm1 = class(TForm)
HeaderControl1: THeaderControl;
StatusBar1: TStatusBar;
Memo1: TMemo;
procedure FormCreate(Sender: TObject);
procedure HeaderControl1SectionClick(HeaderControl: THeaderControl;
Section: THeaderSection);
private
{ Private declarations }
public
{ Public declarations }
end;
type TNamesTowns = class
Names, Towns: string;
procedure Init(PNames,PTowns: string);
end;
var
Form1: TForm1;
NamesTowns: array [0..2] of TNamesTowns;
NumberOfItems: integer;
implementation
{$R *.dfm}
procedure TNamesTowns.Init(PNames,PTowns: string);
begin
Names := PNames;
Towns := PTowns;
end;
{------------------------------------------------------------------------------}
procedure TForm1.FormCreate(Sender: TObject);
Var tabs: Array [0..1] of Integer; //for making memo with multible columns
//i: integer;
begin
NumberOfItems := 3;
tabs[0] := 18 * 4; //to get more than one column (here just 2)
Memo1.Clear; // {test-phase} Memo1.Lines.Add('A'#9'S');
Memo1.Perform( EM_SETTABSTOPS, 2, LongInt(@tabs));
Memo1.Refresh;
NamesTowns[0] := TNamesTowns.Create;
NamesTowns[0].Init('John Melkenow','New York');
Memo1.Lines.Add(NamesTowns[0].Names+#9+NamesTowns[0].Towns);
NamesTowns[1] := TNamesTowns.Create;
NamesTowns[1].Init('Mark Feelix','Amsterdam');
Memo1.Lines.Add(NamesTowns[1].Names+#9+NamesTowns[1].Towns);
NamesTowns[2] := TNamesTowns.Create;
NamesTowns[2].Init('Ferda Saracoglu','Istanbul');
Memo1.Lines.Add(NamesTowns[2].Names+#9+NamesTowns[2].Towns);
end;
procedure TForm1.HeaderControl1SectionClick(HeaderControl: THeaderControl;
Section: THeaderSection);
var //btw: I use here the bubblesort (fast enough for this!!!
done: boolean;
i, n: integer;
Dummy,Dummy2: string;
begin
Memo1.Lines.Clear;
n := NumberOfItems;
case Section.Index of
0: repeat
done := true;
for i := 0 to n - 2 do
if NamesTowns[i].Names NamesTowns[i + 1].Names then
begin
Dummy := NamesTowns[i].Names; Dummy2 := NamesTowns[i].Towns;
NamesTowns[i].Names := NamesTowns[i + 1].Names;
NamesTowns[i].Towns := NamesTowns[i + 1].Towns;
NamesTowns[i + 1].Names := Dummy; NamesTowns[i + 1].Towns := Dummy2;
done := false;
end;
until done;
1: repeat
done := true;
for i := 0 to n - 2 do
if NamesTowns[i].Towns NamesTowns[i + 1].Towns then
begin
Dummy := NamesTowns[i].Names; Dummy2 := NamesTowns[i].Towns;
NamesTowns[i].Names := NamesTowns[i + 1].Names;
NamesTowns[i].Towns := NamesTowns[i + 1].Towns;
NamesTowns[i + 1].Names := Dummy; NamesTowns[i + 1].Towns := Dummy2;
done := false;
end;
until done;
end; //case Section.Index of
for i:=0 to 2 do Memo1.Lines.Add(NamesTowns[i].Names + #9 + NamesTowns[i].Towns);
end;
end.
here the dpr:
program TMemo_THeaderControl;
uses
Forms,
Unit1 in 'Unit1.pas' {Form1};
{$R *.res}
begin
Application.Initialize;
Application.CreateForm(TForm1, Form1);
Application.Run;
end.
and the dfm:unit1.dfm
object Form1: TForm1
Left = 416
Top = 378
Width = 229
Height = 143
Caption = 'Examp.fuo.TMemo'
Color = clBtnFace
Font.Charset = DEFAULT_CHARSET
Font.Color = clWindowText
Font.Height = -11
Font.Name = 'MS Sans Serif'
Font.Style = []
OldCreateOrder = False
OnCreate = FormCreate
PixelsPerInch = 96
TextHeight = 13
object HeaderControl1: THeaderControl
Left = 0
Top = 0
Width = 221
Height = 17
DragReorder = False
Sections = item
ImageIndex = -1
Text = 'Name'
Width = 110
end
item
ImageIndex = -1
Text = 'Town'
Width = 110
end
OnSectionClick = HeaderControl1SectionClick
end
object StatusBar1: TStatusBar
Left = 0
Top = 97
Width = 221
Height = 19
Panels = item
Text = 'Dir:\TMemo_THeaderControl'
Width = 50
end
SimplePanel = False
end
object Memo1: TMemo
Left = 0
Top = 17
Width = 221
Height = 80
Hint =
'Combine TMemo with THeaderControl'#13#10'to achieve a TMemo that:'#13#10'-- ' +
'can have more than one Column'#13#10'-- sort the lines in the TMemo by' +
' each of its'#13#10' columns by clicking on each section of the '#13#10' ' +
' THeaderControl'
Align = alClient
Lines.Strings = (
'Memo1')
ParentShowHint = False
ShowHint = True
TabOrder = 2
end
end