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function MyListViewWndProc(p1: HWND; p2: UINT; p3: WPARAM; p4: LPARAM): LRESULT;
var
ParentH : HWND;
M : TMessage;
Buffer : IntPtr;
Begin
ParentH := GetParent(p1);
if (ParentH = 0) or (ParentH = p1) then begin
Result := 1;
Exit;
End;
M.Msg := p2;
M.WParam := p3;
M.LParam := p4;
Buffer := Marshal.AllocHGlobal(Marshal.SizeOf(TypeOf(TObject(p3))));
try
Marshal.StructureToPtr(TObject(p3), Buffer, False);
Result := SendMessage(ParentH, PM_HEADERMSG, longint(p3), 0);
finally
Marshal.DestroyStructure(Buffer, TypeOf(LParam));
Marshal.FreeHGlobal(Buffer);
end;
end;
constructor TsListView.Create(AOwner: TComponent);
begin
inherited Create(AOwner);
Header := 0;
HeaderWndProc := 0;
ViewStyle := vsReport;
FixedColor := clBtnFace;
end;
procedure TsListView.ChangeHeaderWndProc(var Msg: TMessage);
begin
CMRecreateWnd(Msg);
If (Parent <> nil) Then Begin
Header := FindWindowEx(Handle, 0, 'SysHeader32', nil);
If Header = 0 Then Exit;
HeaderWndProc := GetWindowLong(Header, GWL_WNDPROC);
SetWindowLong(Header, GWL_WNDPROC, @MyListViewWndProc);
End;
end;
procedure TsListView.CMRecreateWnd(var Message: TMessage);
begin
If Header <> 0 Then Begin
If HeaderWndProc <> 0 Then
SetWindowLong(Header, GWL_WNDPROC, HeaderWndProc);
Header := 0;
HeaderWndProc := 0;
End;
end;
procedure TsListView.HeaderMessage(var Msg: TMessage);
begin
Msg.Result := CallWindowProc(IntPtr(HeaderWndProc), Header, Msg.Msg, Msg.WParam, Msg.LParam);
If Msg.Msg = WM_PAINT Then
DrawButtons;
end;
procedure TsListView.DrawButtons;
Var
DC : HDC;
Bounds : TRect;
Border1,
Border2 : Integer;
I, X : Integer;
Canvas : TCanvas;
Begin
If Header = 0 Then Exit;
FFixedColor := clblue;
Windows.GetClientRect(Header, Bounds);
Border1 := GetSystemMetrics(SM_CXBORDER);
Border2 := GetSystemMetrics(SM_CXFIXEDFRAME) - Border1;
DC := GetDC(Header); X := 0;
Canvas := TCanvas.Create;
Canvas.Handle := DC;
Canvas.Brush.Color := FFixedColor;
For I := 0 To Columns.Count - 1 Do Begin
Canvas.FillRect(Rect(X + Border1, Border1,
X + Columns[I].Width - Border2,
Bounds.Bottom - Border2));
Canvas.TextOut(X + Border2, Border2, Columns[I].Caption);
X := X + Columns[I].Width;
End;
Canvas.FillRect(Rect(X + Border1, Border1, Bounds.Right, Bounds.Bottom - Border2));
Canvas.Free;
End;
procedure TsListView.SetFixedColor(const Value: TColor);
begin
FFixedColor := clblue;
DrawButtons;
end;
procedure TsListView.CreateHandle;
begin
inherited;
If Parent <> nil Then
PostMessage(Handle, PM_CHANGEPROC, 0, 0);
end;
function TsListView.get_CheckedCount: Integer;
var
cpt: integer;
begin
Result := 0;
cpt := 0;
while (cpt < Items.Count) do begin
Inc(Result, Ord(Items[cpt].Checked));
Inc(cpt);
end;
end; |
