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{$mode objfpc}{$h+}
unit FPGlib;
interface
uses classes, glib;
type
TLukForEachProcedure = procedure (item : pointer; data : pointer) of object;
TLList = class (TList)
private
FGSList : PGSList;
FGList : PGList;
FNotUpdating,
FClassesChanged,FSlistChanged,FListChanged : Boolean;
procedure FreeList;
procedure FreeSList;
function CreateGList : PGList;
function GetTheGtkList : PGList;
procedure SetGtkList (Value : PGList);
function CreateGSList : PGSList;
function GetTheGtkSList : PGSlist;
procedure SetGtkSList (Value : PGSList);
procedure BuildFromGtkList;
procedure BuildFromGtkSList;
protected
procedure Notify (Ptr: Pointer; Action: TListNotification); override;
function GetData (index : integer) : pointer; dynamic;
function UngetData (data : pointer) : pointer; dynamic;
// GetData needs to give the pointer to the data in the List or SList of GTK
// UngetData needs to give the item in this list from the datapointer of GTK
public
constructor create;
destructor destroy; override;
function GetGtkList (buffered : boolean) : PGList;
function GetGtkSList (buffered : boolean) : PGSlist;
procedure BeginUpdate; // Currently only changes in 1 list are possible
procedure EndUpdate; // without memory leaks and/or errors in the list
procedure ForEach (Proc : TLukForEachprocedure; data : pointer);
property GtkList : PGList read GetTheGtkList write SetGtkList;
property GtkSList : PGSList read GetTheGtkSList write SetGtkSList;
end;
implementation
{ TLList }
procedure TLList.FreeList;
begin
if FGList <> null then
begin
g_list_free (FGList);
FGList := null;
end;
end;
procedure TLList.FreeSList;
begin
if FGSList <> null then
begin
g_slist_free (FGSList);
FGSlist := null;
end;
end;
procedure TLList.Notify(Ptr: Pointer; Action: TListNotification);
begin
inherited;
FClassesChanged := True;
end;
constructor TLList.create;
begin
inherited create;
FClassesChanged := False;
FListChanged := false;
FSListChanged := False;
FGList := null;
FGSList := null;
FNotUpdating := True;
end;
destructor TLList.destroy;
begin
FreeList;
FreeSList;
inherited Destroy;
end;
function TLList.GetGtkList (buffered : boolean) : PGList;
begin
if buffered then
if FClasseschanged then
result := CreateGList
else if FSListChanged then
begin
BuildFromGtkSList;
result := CreateGList;
end
else
result := FGlist
else
result := CreateGList;
end;
function TLList.GetGtkSList (buffered : boolean) : PGSList;
begin
if buffered then
if FClassesChanged then
result := CreateGSList
else if FListChanged then
begin
BuildFromGtkList;
result := CreateGSList;
end
else
result := FGSlist
else
result := CreateGSList;
end;
function TLList.CreateGList : PGList;
var r : integer;
begin
FreeList;
result := null;
for r := pred(count) downto 0 do
result := g_list_prepend (result, GetData(r));
FGList := result;
end;
function TLList.CreateGSList : PGSList;
var r : integer;
begin
FreeSList;
result := null;
for r := pred(count) downto 0 do
result := g_slist_prepend (result, GetData(r));
FGSList := result;
end;
function TLList.GetData (index : integer) : pointer;
begin
result := items[index];
end;
function TLList.UngetData (data : pointer) : pointer;
begin
result := data
end;
function TLList.GetTheGtkList : PGList;
begin
result := GetGtkList (True);
end;
procedure TLList.SetGtkList (Value : PGList);
begin
FGList := Value;
if FNotUpdating then
BuildFromGtkList
else
FListChanged := True;
end;
function TLList.GetTheGtkSList : PGSlist;
begin
result := GetGtkSList (True);
end;
procedure TLList.SetGtkSList (Value : PGSList);
begin
FGSlist := Value;
if FNotUpdating then
BuildFromGtkSList
else
FSListChanged := True;
end;
procedure TLList.BuildFromGtkList;
var p : PGList;
begin
clear;
p := FGList;
while p <> null do
begin
add (UngetData(p^.data));
p := p^.Next;
end;
FListChanged := False;
FSListChanged := False;
FClassesChanged := False;
FreeSList;
end;
procedure TLList.BuildFromGtkSList;
var p :PGSList;
begin
clear;
p := FGSList;
while p <> null do
begin
add (UngetData(p^.data));
p := p^.Next;
end;
FListChanged := False;
FSListChanged := False;
FClassesChanged := False;
FreeList;
end;
procedure TLList.BeginUpdate;
begin
FNotUpdating := False;
end;
procedure TLList.EndUpdate;
begin
FNotUpdating := True;
if FlistChanged then
BuildFromGtkSList
else if FSListChanged then
BuildFromGtkSList
else if FClassesChanged then
begin
FreeSList;
FreeList;
end;
end;
procedure TLList.ForEach (Proc : TLukForEachProcedure; data : pointer);
var r: integer;
begin
for r := 0 to pred(count) do
Proc (items[r], data);
end;
end.
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