whats new ¦  programming tips ¦  indy articles ¦  intraweb articles ¦  informations ¦  links ¦  interviews
 misc ¦  tutorials ¦  Add&Win Game

Tips (1548)

Database (90)
Files (137)
Forms (107)
Graphic (116)
IDE (21)
Indy (5)
Internet / LAN (131)
IntraWeb (0)
Math (76)
Misc (127)
Multimedia (45)
Objects/
ActiveX (51)

OpenTools API (3)
Printing (35)
Strings (83)
System (268)
VCL (243)

Top15

Tips sort by
component


Search Tip

Add new Tip

Add&Win Game

Advertising

27 Visitors Online


 
...display the items in a listview control display as a group (XP)?
Autor: Thomas Stutz
[ Print tip ]  

Tip Rating (26):  
     




// declarations from commctrl.h
type
  
TLVGROUP = record
    
cbSize: UINT;
    mask: UINT;
    pszHeader: LPWSTR;
    cchHeader: Integer;
    pszFooter: LPWSTR;
    cchFooter: Integer;
    iGroupIdL: Integer;
    stateMask: UINT;
    state: UINT;
    uAlign: UINT;
  end;

  tagLVITEMA = packed record
    
mask: UINT;
    iItem: Integer;
    iSubItem: Integer;
    state: UINT;
    stateMask: UINT;
    pszText: PAnsiChar;
    cchTextMax: Integer;
    iImage: Integer;
    lParam: lParam;
    iIndent: Integer;
    iGroupId: Integer;
    cColumns: UINT;
    puColumns: PUINT;
  end;
  TLVITEMA = tagLVITEMA;

const
  
LVM_ENABLEGROUPVIEW = LVM_FIRST + 157;
  LVM_MOVEITEMTOGROUP = LVM_FIRST + 154;
  LVM_INSERTGROUP     = LVM_FIRST + 145;

  LVIF_GROUPID = $0100;

  LVGF_HEADER  = $00000001;
  LVGF_ALIGN   = $00000008;
  LVGF_GROUPID = $00000010;

  LVGA_HEADER_LEFT   = $00000001;
  LVGA_HEADER_CENTER = $00000002;
  LVGA_HEADER_RIGHT  = $00000004;


procedure TForm1.Button1Click(Sender: TObject);
var
  
LvGroup: TLVGROUP;
  LvItemA: TLVITEMA;
  ListItem: TListItem;
  I: Byte;
begin
  
// Fill listview with random data
  
Randomize;
  for i := 1 to 10 do
  begin
    
ListItem := ListView1.Items.Add;
    ListItem.Caption := IntToStr(Random(100));
  end;

  SendMessage(ListView1.Handle, LVM_ENABLEGROUPVIEW, 1, 0);

  // Create Group1
  
FillChar(LvGroup, SizeOf(TLVGROUP), 0);
  with LvGroup do
  begin
    
cbSize := SizeOf(TLVGROUP);
    mask := LVGF_HEADER or LVGF_ALIGN or LVGF_GROUPID;
    pszHeader := 'Group 1';
    cchHeader := Length(LvGroup.pszHeader);
    iGroupIdL := 0;
    uAlign := LVGA_HEADER_CENTER;
  end;
  SendMessage(ListView1.Handle, LVM_INSERTGROUP, 0, Longint(@LvGroup));

  // Create Group2
  
FillChar(LvGroup, SizeOf(LvGroup), 0);
  with LvGroup do
  begin
    
cbSize := SizeOf(TLVGROUP);
    mask := LVGF_HEADER or LVGF_ALIGN or LVGF_GROUPID;
    pszHeader := 'Group 2';
    cchHeader := Length(LvGroup.pszHeader);
    iGroupIdL := 1;
    uAlign := LVGA_HEADER_LEFT
  end;
  SendMessage(ListView1.Handle, LVM_INSERTGROUP, 1, Longint(@LvGroup));

  // Assign items to the groups
  
for I := 0 to ListView1.Items.Count - 1 do
  begin
    with 
LvItemA do
    begin
      
FillChar(LvItemA, SizeOf(TLvItemA), 0);
      mask := LVIF_GROUPID;
      iItem := I;
      iGroupId := Random(2);
    end;
    SendMessage(ListView1.Handle, LVM_SETITEM, 0, Longint(@LvItemA))
  end;
end;



// XPManifest needed!

 

Rate this tip:

poor
very good


Copyright © by SwissDelphiCenter.ch
All trademarks are the sole property of their respective owners