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{
fpGUI - Free Pascal GUI Library
Bin widget declarations
Copyright (C) 2000 - 2006 See the file AUTHORS.txt, included in this
distribution, for details of the copyright.
See the file COPYING.modifiedLGPL, included in this distribution,
for details about redistributing fpGUI.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
}
{%mainunit fpgui.pas}
{$IFDEF read_interface}
{ Bin widget declarations }
TBinWidget = class(TContainerWidget)
protected
FChild: TWidget;
procedure SetChild(AChild: TWidget);
function GetChildCount: Integer; override;
function GetChild(Index: Integer): TWidget; override;
procedure CalcSizes; override;
public // !!!: temporarily
property Child: TWidget read FChild write SetChild;
// really public :)
function ContainsChild(AChild: TWidget): Boolean; override;
procedure InsertChild(AChild: TWidget); override;
procedure RemoveChild(AChild: TWidget); override;
end;
{$ENDIF read_interface}
{$IFDEF read_implementation}
// ===================================================================
// TBinWidget
// ===================================================================
function TBinWidget.ContainsChild(AChild: TWidget): Boolean;
begin
Result := Assigned(AChild) and (FChild = AChild);
end;
procedure TBinWidget.InsertChild(AChild: TWidget);
begin
if FChild <> AChild then
begin
if Assigned(FChild) then
FChild.Parent := nil;
FChild := AChild;
FChild.Parent := Self;
end;
end;
procedure TBinWidget.RemoveChild(AChild: TWidget);
begin
if FChild = AChild then
begin
FChild := nil;
AChild.Parent := nil;
end;
end;
function TBinWidget.GetChildCount: Integer;
begin
Result := Ord(Assigned(Child));
end;
function TBinWidget.GetChild(Index: Integer): TWidget;
begin
if (Index = 0) and Assigned(Child) then
Result := Child
else
TList.Error(SListIndexError, Index);
end;
procedure TBinWidget.CalcSizes;
begin
LAYOUTTRACE('TBinWidget.CalcSizes for %s:%s', [Name, ClassName]);
if Assigned(Child) then
begin
FMinSize := Child.MinSize;
FMaxSize := Child.MaxSize;
FDefSize := Child.DefSize;
end;
end;
procedure TBinWidget.SetChild(AChild: TWidget);
begin
InsertChild(AChild);
end;
{$ENDIF read_implementation}
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