unit ThemesApp;
interface
procedure EnableThemesApp;
procedure DisableThemesApp;
implementation
uses
Controls,
Forms,
Messages,
UxTheme,
Sysutils,
Windows;
type
TJumpOfs = Integer;
PPointer = ^Pointer;
PXRedirCode = ^TXRedirCode;
TXRedirCode =
packed record
Jump: Byte;
Offset: TJumpOfs;
end;
PAbsoluteIndirectJmp = ^TAbsoluteIndirectJmp;
TAbsoluteIndirectJmp =
packed record
OpCode: Word;
Addr: PPointer;
end;
var
UseThemesBackup: TXRedirCode;
function GetActualAddr(Proc: Pointer): Pointer;
begin
if Proc <>
nil then
begin
if (Win32Platform = VER_PLATFORM_WIN32_NT)
and (PAbsoluteIndirectJmp(Proc).OpCode = $25FF)
then
Result := PAbsoluteIndirectJmp(Proc).Addr^
else
Result := Proc;
end
else
Result :=
nil;
end;
procedure HookProc(Proc, Dest: Pointer;
var BackupCode: TXRedirCode);
var
n: DWORD;
Code: TXRedirCode;
begin
Proc := GetActualAddr(Proc);
Assert(Proc <>
nil);
if ReadProcessMemory(GetCurrentProcess, Proc, @BackupCode, SizeOf(BackupCode), n)
then
begin
Code.Jump := $E9;
Code.Offset := PAnsiChar(Dest) - PAnsiChar(Proc) - SizeOf(Code);
WriteProcessMemory(GetCurrentProcess, Proc, @Code, SizeOf(Code), n);
end;
end;
procedure UnhookProc(Proc: Pointer;
var BackupCode: TXRedirCode);
var
n: Cardinal;
begin
if (BackupCode.Jump <> 0)
and (Proc <>
nil)
then
begin
Proc := GetActualAddr(Proc);
Assert(Proc <>
nil);
WriteProcessMemory(GetCurrentProcess, Proc, @BackupCode, SizeOf(BackupCode), n);
BackupCode.Jump := 0;
end;
end;
function UseThemesH:Boolean;
Var
Flag : DWORD;
begin
Flag:=GetThemeAppProperties;
if ( (@IsAppThemed<>
nil)
and (@IsThemeActive<>
nil) )
then
Result := IsAppThemed
and IsThemeActive
and ((Flag
and STAP_ALLOW_CONTROLS)<>0)
else
Result := False;
end;
procedure HookUseThemes;
begin
HookProc(@UxTheme.UseThemes, @UseThemesH, UseThemesBackup);
end;
procedure UnHookUseThemes;
begin
UnhookProc(@UxTheme.UseThemes, UseThemesBackup);
end;
Procedure DisableThemesApp;
begin
SetThemeAppProperties(0);
SendMessage(Application.Handle,WM_THEMECHANGED,0,0);
SendMessage(Application.MainForm.Handle,CM_RECREATEWND,0,0);
end;
Procedure EnableThemesApp;
begin
SetThemeAppProperties(STAP_ALLOW_NONCLIENT
or STAP_ALLOW_CONTROLS
or STAP_ALLOW_WEBCONTENT);
SendMessage(Application.Handle,WM_THEMECHANGED,0,0);
SendMessage(Application.MainForm.Handle,CM_RECREATEWND,0,0);
end;
initialization
HookUseThemes;
finalization
UnHookUseThemes;
end.