unit FastPHPTreeView;
interface
uses
SysUtils, Classes, ComCtrls;
(*
<FastPHPData> ::= <FastPHPData100> .
Version 1.00 (signature "FAST100!"):
<FastPHPData100> ::= <Signature100> ( <Nodes> <Exit> | <Exit> ) .
<Signature100> ::= "F" "A" "S" "T" "1" "0" "0" "!" .
<Nodes> ::= <Node> | ( <Nodes> <Node> ) .
<Node> ::= <LeafNode> | ( <LeafNode> <IncreaseLevel> <Nodes> <DecreaseLevel> ) .
<LeafNode> ::= "N" <Icon> <LineNo> <DescLen> <Desc> .
<IncreaseLevel> ::= "I" .
<DecreaseLevel> ::= "D" .
<Exit> ::= "X" .
<LineNo> ::= <Int8> .
<DescLen> ::= <Int4> .
<Desc> ::= (Utf8-String) .
<Icon> ::= <NoIcon> | <ImageIndex> .
<NoIcon> ::= "_" "_" "_" "_" .
<ImageIndex> ::= <Int4> .
<Int1> ::= "0" | "1" | "2" | "3" | "4" | "5" | "6" | "7" | "8" | "9" .
<Int2> ::= <Int1> <Int1> .
<Int4> ::= <Int2> <Int2> .
<Int8> ::= <Int4> <Int4> .
*)
type
TTreeViewFastPHP = class helper for TTreeView
private
class function Read(var ptr: PChar; len: integer): string; inline;
procedure Rec100(tn: TTreeNode; var ptr: PChar);
protected
procedure DoFillWithFastPHPData(ptr: PChar);
public
procedure FillWithFastPHPData(data: string);
end;
EFastNodeException = class(Exception);
implementation
uses
StrUtils, Windows;
const
LEN_MAGIC = 8;
LEN_ICON = 4;
LEN_LINENO = 8;
LEN_DESCLEN = 4;
{$EXTERNALSYM LockWindowUpdate}
function LockWindowUpdate(hWndLock: HWND): BOOL; stdcall; external user32 name 'LockWindowUpdate';
function HexToInt(HexNum: string): LongInt;
begin
Result := StrToInt('$' + HexNum);
end;
procedure TTreeViewFastPHP.DoFillWithFastPHPData(ptr: PChar);
function _NodeID(tn: TTreeNode): string;
var
tmp: TTreeNode;
begin
// Attention: This function requires that the tree node items are unique
// e.g. Class1->function1() is unique
result := tn.Text;
tmp := tn.Parent;
while tmp <> nil do
begin
result := tmp.Text + #0 + result;
tmp := tmp.Parent;
end;
end;
var
s: String;
tn: TTreeNode;
expanded: TStringList;
selected, magic: string;
horPos, verPos: integer;
i: integer;
crc32: string;
begin
// No update if the user is dragging the scrollbar
// (otherwise the program will somehow lock up)
if GetCapture = Handle then exit;
// Don't rebuild the treeview if nothing has changed (use the Tag property to store the CRC32)
crc32 := Read(ptr, 8);
if crc32 = IntToHex(Tag, 8) then exit;
Tag := HexToInt(crc32);
selected := '';
expanded := TStringList.Create;
horPos := GetScrollPos(Handle, SB_HORZ);
verPos := GetScrollPos(Handle, SB_VERT);
LockWindowUpdate(Parent.Handle); // Parent is better choice for FastPHP... but for other applications it might be wrong?
Self.Items.BeginUpdate;
try
{$REGION 'Remember our current state (selected and expanded flags)'}
for i := 0 to Self.Items.Count-1 do
begin
tn := Self.Items.Item[i];
s := _NodeID(tn);
if tn.Selected then selected := s;
if tn.Expanded and tn.HasChildren then expanded.Add(s);
end;
{$ENDREGION}
{$REGION 'Update the treeview'}
Self.Items.Clear;
try
magic := Read(ptr, LEN_MAGIC);
if magic = 'FAST100!' then
Rec100(nil, ptr)
else
raise EFastNodeException.CreateFmt('FastNode version "%s" not supported.', [magic]);
except
on E: Exception do
begin
Self.Items.Clear;
tn := Self.Items.Add(nil, 'ERROR: ' + E.Message);
tn.ImageIndex := -1;
tn.SelectedIndex := -1;
end;
end;
{$ENDREGION}
{$REGION 'Recover the previous current state (selected and expanded flags)'}
for i := 0 to Self.Items.Count-1 do
begin
tn := Self.Items.Item[i];
s := _NodeID(tn);
if selected = s then tn.Selected := true;
if expanded.IndexOf(s) >= 0 then tn.Expand(false);
end;
{$ENDREGION}
finally
Self.Items.EndUpdate;
LockWindowUpdate(0);
SetScrollPos(Handle, SB_HORZ, horPos, false);
SetScrollPos(Handle, SB_VERT, verPos, false);
expanded.Free;
end;
end;
procedure TTreeViewFastPHP.FillWithFastPHPData(data: string);
begin
data := Trim(data);
if not EndsStr('X', data) then raise EFastNodeException.Create('FastNode string must end with "X"');
DoFillWithFastPHPData(PChar(data));
end;
class function TTreeViewFastPHP.Read(var ptr: PChar; len: integer): string;
begin
result := Copy(string(ptr), 1, len);
inc(ptr, len);
end;
procedure TTreeViewFastPHP.Rec100(tn: TTreeNode; var ptr: PChar);
var
typ, icon, lineno, len, caption: string;
lastTn: TTreeNode;
begin
try
lastTn := nil;
while true do
begin
repeat
typ := Read(ptr, 1);
until Trim(typ) <> '';
if typ = 'N' then // new node
begin
icon := Read(ptr, LEN_ICON);
lineno := Read(ptr, LEN_LINENO);
len := Read(ptr, LEN_DESCLEN);
caption := Utf8Decode(Read(ptr, StrToInt(len)));
if tn = nil then
lastTn := Self.Items.Add(nil, caption)
else
lastTn := Self.Items.AddChild(tn, caption);
{$REGION 'Determinate icon'}
if icon = '____' then
lastTn.ImageIndex := -1
else
lastTn.ImageIndex := StrToInt(icon);
lastTn.SelectedIndex := lastTn.ImageIndex;
{$ENDREGION}
lastTn.Data := Pointer(StrToInt(lineno)); // Hack...
end
else if typ = 'I' then // increase level
begin
if LastTn = nil then raise EFastNodeException.Create('Fast100: Increase command requires previous node');
Rec100(lastTn, ptr);
end
else if typ = 'D' then Exit // decrease level
else if typ = 'X' then Abort // exit
else raise EFastNodeException.CreateFmt('Fast100: Command "%s" unknown', [typ]);
end;
except
on E: EAbort do
if tn = nil then
exit
else
raise;
else
raise;
end;
end;
end.