[Lazarus] Docking state question

[Hans-Peter Diettrich]

Hans-Peter Diettrich schrieb:

> In the 64 bit and SVN trunk version (32 bit) docking works much 
> smoother, but the dockable IDE is a mess. The DragManager gets no keys, 
> i.e. docking cannot be aborted with Esc.

See workaround in preceding message.

> The dockable IDE is not 
> dockable at all, i.e. the docked forms cannot be undocked or docked to 
> other windows.

Fix for this problem (dragmanager.inc):

procedure TDragManagerDefault.CaptureChanged(OldCaptureControl: TControl);
{
var
   i: integer;
   AIsDragging,
   AIsDocking: Boolean;
}
begin
   // if this is TWinControl, and it have controls (not TWinControls)
   // then we should check Dragging in those controls
{$IFDEF old}
   AIsDocking := False;
   AIsDragging := OldCaptureControl.Dragging;
   if AIsDragging then
     AIsDocking := OldCaptureControl.DragKind = dkDock;
   if (not AIsDragging) and (OldCaptureControl is TWinControl) then
   begin
     for i := 0 to TWinControl(OldCaptureControl).ControlCount - 1 do
     begin
       AIsDragging := AIsDragging or 
TWinControl(OldCaptureControl).Controls[i].Dragging;
       if AIsDragging then
       begin
         AIsDocking := 
TWinControl(OldCaptureControl).Controls[i].DragKind = dkDock;
         break;
       end;
     end;
   end;
   // when we are start drag/dock in TDockHeader then we should
   // take into account that it doesnot belong to our control - it
   // belongs to parent => we should allow parent to get capture
   if not (AIsDocking and (CaptureControl = OldCaptureControl.Parent)) then
     DragStop(AIsDragging);
{$ELSE}
   if (FPerformer = nil) or (CaptureControl = OldCaptureControl) then
     exit;
   if not (FPerformer is TDockPerformer) then
     exit;
   if assigned(CaptureControl) and (CaptureControl.Parent = 
OldCaptureControl) then
     exit;
   DragStop(False);
{$ENDIF}
end;