So wie ich das lesen konnte, ist das unter Windows kein Bug sondern ein Feature:
Code: Alles auswählen
Win32WSCustomListView.inc
...
function ListViewParentMsgHandler(const AWinControl: TWinControl; Window: HWnd;
Msg: UInt; WParam: Windows.WParam; LParam: Windows.LParam;
var MsgResult: Windows.LResult; var WinProcess: Boolean): Boolean;
...
NM_CLICK, NM_RCLICK:
begin
// A listview doesn't get a WM_LBUTTONUP, WM_RBUTTONUP message,
// because it keeps the message in its own event loop,
// see msdn article about "Default List-View Message Processing"
// therefore we take this notification and create a
// LM_LBUTTONUP, LM_RBUTTONUP message out of it
WinProcess := False;
if PNMHdr(LParam)^.code = NM_CLICK then
Msg := LM_LBUTTONUP
else
Msg := LM_RBUTTONUP;
...
Edit: Wobei, wenn ich den besagten Teil auskommentiere, funktioniert es scheinbar wie gewünscht
:
Code: Alles auswählen
function ListViewParentMsgHandler(const AWinControl: TWinControl; Window: HWnd;
Msg: UInt; WParam: Windows.WParam; LParam: Windows.LParam;
var MsgResult: Windows.LResult; var WinProcess: Boolean): Boolean;
...
var
Pos: TSmallPoint;
begin
Result := False;
case Msg of
WM_NOTIFY:
begin
case PNMHdr(LParam)^.code of
{ NM_CLICK, NM_RCLICK:
begin
// A listview doesn't get a WM_LBUTTONUP, WM_RBUTTONUP message,
// because it keeps the message in its own event loop,
// see msdn article about "Default List-View Message Processing"
// therefore we take this notification and create a
// LM_LBUTTONUP, LM_RBUTTONUP message out of it
WinProcess := False;
if PNMHdr(LParam)^.code = NM_CLICK then
Msg := LM_LBUTTONUP
else
Msg := LM_RBUTTONUP;
Pos := GetClientCursorPos(PNMHdr(LParam)^.hwndFrom);
// to make correct event sequence in LCL we should postpone this message
// since we are here after call of CallDefaultWindowProc
// TODO: prevent getting more than one Up, Down message by LCL
PostMessage(PNMHdr(LParam)^.hwndFrom, Msg, 0, MakeLParam(Pos.x, Pos.y));
Result := True;
end;}
LVN_GETDISPINFOA, LVN_GETDISPINFOW:
HandleListViewOwnerData(TCustomListViewAccess(AWinControl));
NM_CUSTOMDRAW:
HandleListViewCustomDraw(TCustomListViewAccess(AWinControl));
end;
end;
end;
end;
Könntest ja mal testen, ob die ListView ohne dies trotzdem ihre Arbeit tut. Ich habe aktuell kein Projekt hier, um das ausgiebig zu testen...
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