OnDock (Delphi)

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Description

The following example is taken from the docking demo. It shows how to set permissions to dock dockable objects onto a docking site.

Code

procedure TMainForm.LeftDockPanelDockDrop(Sender: TObject;
  Source: TDragDockObject; X, Y: Integer);
begin
  //OnDockDrop gets called AFTER the client has actually docked,
  //so you check for DockClientCount = 1 before making the dock panel visible.
  if (Sender as TPanel).DockClientCount = 1 then
    ShowDockPanel(Sender as TPanel, True, nil);
  (Sender as TPanel).DockManager.ResetBounds(True);
  //Make DockManager repaint its clients.
end;

procedure TMainForm.LeftDockPanelDockOver(Sender: TObject;
  Source: TDragDockObject; X, Y: Integer; State: TDragState;
  var Accept: Boolean);
var
  ARect: TRect;
begin
  Accept := Source.Control is TDockableForm;
  if Accept then
  begin
    //Modify the DockRect to preview dock area.
    ARect.TopLeft := LeftDockPanel.ClientToScreen(Point(0, 0));
    ARect.BottomRight := LeftDockPanel.ClientToScreen(
      Point(Self.ClientWidth div 3, LeftDockPanel.Height));
    Source.DockRect := ARect;
  end;
end;

procedure TMainForm.LeftDockPanelUnDock(Sender: TObject; Client: TControl;
  NewTarget: TWinControl; var Allow: Boolean);
begin
  //OnUnDock gets called BEFORE the client is undocked, in order to optionally
  //disallow the undock. DockClientCount is never 0 when called from this event.
  if (Sender as TPanel).DockClientCount = 1 then
    ShowDockPanel(Sender as TPanel, False, nil);
end;

procedure TMainForm.LeftDockPanelGetSiteInfo(Sender: TObject;
  DockClient: TControl; var InfluenceRect: TRect; MousePos: TPoint;
  var CanDock: Boolean);
begin
  //If CanDock is True, the panel will not automatically draw the preview rect.
  CanDock := DockClient is TDockableForm;
end;

Uses

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