Прозрачный градиент поверх GUI

#include <GUIConstantsEx.au3>
#include <StaticConstants.au3>
#include <WindowsConstants.au3>

$hGUI = GUICreate("Test Script", 300, 200)
GUICtrlCreateLabel('Top Data' & @CRLF & @CRLF & @CRLF & @CRLF & @CRLF & @CRLF & 'Middle data' & @CRLF & @CRLF & @CRLF & @CRLF & @CRLF & @CRLF & 'Bottom Data', 20, 15, 260, 200, $SS_CENTER)

$aParentPos = WinGetPos($hGUI)
Dim $ahCover_GUI[21][2]

For $i = 0 To 20
	;Top Cover
	$ahCover_GUI[$i][0] = GUICreate("", $aParentPos[2] - 6, 4, $aParentPos[0] + 3, $aParentPos[1] + 25 + ($i * 2), $WS_POPUP, -1, $hGUI)
	GUISetBkColor(0xFFFFFF, $ahCover_GUI[$i][0])
	WinSetTrans($ahCover_GUI[$i][0], "", (255 / 20) * (-1 * ($i - 20)))
	
	;Bottom cover
	$ahCover_GUI[$i][1] = GUICreate("", $aParentPos[2] - 6, 4, $aParentPos[0] + 3, $aParentPos[1] + ($aParentPos[3] - 8) - ($i * 2), $WS_POPUP, -1, $hGUI)
	GUISetBkColor(0xFFFFFF, $ahCover_GUI[$i][1])
	WinSetTrans($ahCover_GUI[$i][1], "", (255 / 20) * (-1 * ($i - 20)))
Next

For $i = 0 To 20
	GUISetState(@SW_SHOW, $ahCover_GUI[$i][0])
	GUISetState(@SW_SHOW, $ahCover_GUI[$i][1])
Next

GUISetState(@SW_SHOW, $hGUI)
GUIRegisterMsg($WM_MOVE, "WM_MOVE")

While 1
	Switch GUIGetMsg()
		Case $GUI_EVENT_CLOSE
			Exit
	EndSwitch
WEnd

Func WM_MOVE($hWndGUI, $MsgID, $WParam, $LParam)
	If $hWndGUI = $hGUI Then
		$aParentPos = WinGetPos($hGUI)
		
		For $i = 0 To 20
			WinMove($ahCover_GUI[$i][0], "", $aParentPos[0]+3, $aParentPos[1] + 25 + ($i * 2))
			WinMove($ahCover_GUI[$i][1], "", $aParentPos[0]+3, $aParentPos[1] + ($aParentPos[3] - 8) - ($i * 2))
		Next
	EndIf
EndFunc

#include <GDIPlus.au3>
#include <WinAPI.au3>
#include <StaticConstants.au3>
#include <WindowsConstants.au3>
#include <GUIConstantsEx.au3>

$hMain_GUI = GUICreate('Gradient Cover GUI (using GDI+)', 300, 200)
GUICtrlCreateLabel('Top Data' & @CRLF & @CRLF & @CRLF & @CRLF & @CRLF & @CRLF & 'Middle data' & @CRLF & @CRLF & @CRLF & @CRLF & @CRLF & @CRLF & 'Bottom Data', 20, 15, 260, 200, $SS_CENTER)
GUISetState(@SW_SHOW, $hMain_GUI)

$hCover_GUI = GUICreate('', 300, 200, -1, -1, $WS_POPUP, $WS_EX_LAYERED, $hMain_GUI)

_GDIPlus_Startup()
$hImage = _GDIPlus_ImageLoadFromFile(_GetGradientPNG())
_WinAPI_SetBitMap($hCover_GUI, $hImage, 255)

WM_MOVE($hMain_GUI, 0, 0, 0)
GUIRegisterMsg($WM_MOVE, 'WM_MOVE')
GUIRegisterMsg($WM_ACTIVATE, 'WM_ACTIVATE')
GUISetState(@SW_SHOWNOACTIVATE, $hCover_GUI)

While 1
	Switch GUIGetMsg()
		Case $GUI_EVENT_CLOSE
			_GDIPlus_ImageDispose($hImage)
			_GDIPlus_Shutdown()
			Exit
	EndSwitch
WEnd

Func _GetGradientPNG($sPNG_File = '')
	If $sPNG_File = '' Or Not FileExists($sPNG_File) Then
		$sPNG_File = @TempDir & '\Gradient.png'
	EndIf
	
	Local $hFile = FileOpen($sPNG_File, 16+2)
	
	FileWrite($hFile, '0x89504E470D0A1A0A0000000D494844520000012C000000C8080600000052DFDC55000003EF4944415478DAEDD6A16D16001485513A000BC0001D800118A003E0ABEB6BD1D85A6465655D1DAE0A5583C14082403469424853FAC39B80E76E6E72CE04577DB947877F5E001438122CA0C504EB393D02606382F5273D02606382F5941E01B031C17A4C8F00D89860FD4E8F00D89860FD4A8F00D898603DA447006C4CB0EED323003626583FD323003626583FD22300362658DFD223003626585FD323003626585FD2230036265877E911001B13ACCFE911001B13ACDBF408808D09D6A7F408808D09D64D7A04C0C604EB3A3D0260638275951E01B031C1BA4C8F00D898607D4C8F00D898605DA447006C4CB03EA447006C4CB0DEA747006C4CB0CED3230036265867E911001B13ACD3F408808D09D6BBF408808D09D6497A04C0C604EB6D7A04C0C604EB4D7A04C0C604EB383D02606382F52A3D0260E1FB04EB657A05C0C6517A00C096600135040BA82158400DC1026A08165043B0801A8205D4102CA086600135040BA82158400DC1026A08165043B0801A8205D4102CA086600135040BA82158400DC1026A08165043B0801A8205D4102CA086600135040BA82158400DC1026A08165043B0801A8205D4102CA086600135040BA82158400DC1026A08165043B0801A8205D4102CA086600135040BA82158400DC1026A08165043B0801A8205D4102CA086600135040BA82158400DC1026A08165043B0801A8205D4102CA086600135040BA82158400DC1026A08165043B0801A8205D4102CA086600135040BA82158400DC1026A08165043B0801A8205D4102CA086600135040BA82158400DC1026A08165043B0801A8205D4102CA086600135040BA82158400DC1026A08165043B0801A8205D4102CA086600135040BA82158400DC1026A08165043B0801A8205D4102CA086600135040BA82158400DC1026A08165043B0801A8205D4102CA086600135040BA82158400DC1026A08165043B0801A8205D4102CA086600135040BA82158400DC1026A08165043B0801A8205D4102CA086600135040BA82158400DC1026A1C1D0E87F406809509D6CBF408808D09D65CACD7E92100FF33C13A4E8F00D89860BD498F00D89860BD4D8F00D898609DA447006C4CB0DEA547006C4CB04ED3230036265867E911001B13ACF3F408808D09D6FBF408808D09D687F408808D09D6457A04C0C604EB637A04C0C604EB323D0260638275951E01B031C1BA4E8F00D89860DDA447006C4CB03EA547006C4CB06ED323003626589FD3230036265877E911001B13AC2FE911001B13ACAFE911001B13AC6FE911001B13AC1FE911001B13AC9FE911001B13ACFBF408808D09D6437A04C0C604EB577A04C0C604EB777A04C0C604EB313D02606382F5941E01B031C1FA931E01B031C17A4E8F00D898601DD2230036040BA8F117BB6D14DA7E8BBB9F0000000049454E44AE426082')
	
	FileClose($hFile)
	
	Return $sPNG_File
EndFunc

Func _WinAPI_SetBitmap($hGUI, $hImage, $iOpacity)
	Local $hScrDC, $hMemDC, $hBitmap, $hOld, $pSize, $tSize, $pSource, $tSource, $pBlend, $tBlend
	Local  Const $AC_SRC_ALPHA = 1
	
	$hScrDC = _WinAPI_GetDC(0)
	$hMemDC = _WinAPI_CreateCompatibleDC($hScrDC)
	$hBitmap = _GDIPlus_BitmapCreateHBITMAPFromBitmap($hImage)
	$hOld = _WinAPI_SelectObject($hMemDC, $hBitmap)
	$tSize = DllStructCreate($tagSIZE)
	$pSize = DllStructGetPtr($tSize)
	DllStructSetData($tSize, "X", _GDIPlus_ImageGetWidth($hImage))
	DllStructSetData($tSize, "Y", _GDIPlus_ImageGetHeight($hImage))
	$tSource = DllStructCreate($tagPOINT)
	$pSource = DllStructGetPtr($tSource)
	$tBlend = DllStructCreate($tagBLENDFUNCTION)
	$pBlend = DllStructGetPtr($tBlend)
	DllStructSetData($tBlend, "Alpha", $iOpacity)
	DllStructSetData($tBlend, "Format", $AC_SRC_ALPHA)
	_WinAPI_UpdateLayeredWindow($hGUI, $hScrDC, 0, $pSize, $hMemDC, $pSource, 0, $pBlend, $ULW_ALPHA)
	_WinAPI_ReleaseDC(0, $hScrDC)
	_WinAPI_SelectObject($hMemDC, $hOld)
	_WinAPI_DeleteObject($hBitmap)
	_WinAPI_DeleteDC($hMemDC)
EndFunc

Func WM_ACTIVATE($hWnd, $iMsg, $wParam, $lParam)
	If $hWnd = $hCover_GUI And BitAND($wParam, 0xFFFF) Then
		WinActivate($hMain_GUI)
	EndIf
EndFunc

Func WM_MOVE($hWnd, $iMsg, $wParam, $lParam)
	If $hWnd = $hMain_GUI Then
		Local $aPos = WinGetPos($hWnd)
		Local $aClientSize = WinGetClientSize($hWnd)
		Local $iBorder = ($aPos[2] - $aClientSize[0]) / 2
		Local $iCaption = $aPos[3] - $aClientSize[1] - $iBorder
		
		WinMove($hCover_GUI, '', $aPos[0] + 3, $aPos[1] + $iCaption)
	EndIf
EndFunc

#Include <GDIP.au3>

; Инициализируем GDI+
_GDIPlus_Startup()

; Создаем пустой GDI+ битмап размером 300x200
$hBitmap = _GDIPlus_BitmapCreateFromScan0(300, 200)

; Получаем контекст битмапа
$hGraphic = _GDIPlus_ImageGetGraphicsContext($hBitmap)

; Делаем битмап полностью прозрачным
_GDIPlus_GraphicsClear($hGraphic, 0)

; Создаем кисть размером 300x50 для рисования верхнего градиента от 100% белого (0xFFFFFFFF) до полностью прозрачного (0x00FFFFFF)
$tRect = DllStructCreate($tagGDIPRECTF)
DllStructSetData($tRect, 'X', 0)
DllStructSetData($tRect, 'Y', 0)
DllStructSetData($tRect, 'Width', 300)
DllStructSetData($tRect, 'Height', 50)
$hBrush = _GDIPlus_LineBrushCreateFromRect($tRect, 0xFFFFFFFF, 0x00FFFFFF, 1)

; Рисуем верхний градиент
_GDIPlus_GraphicsFillRect($hGraphic, 0, 0, 300, 50, $hBrush)

; Поворачиваем кисть на 180 градусов
_GDIPlus_LineBrushRotateTransform($hBrush, 180)

; Рисуем нижний градиент
_GDIPlus_GraphicsFillRect($hGraphic, 0, 150, 300, 50, $hBrush)

; Удаляем ненужные ресурсы
_GDIPlus_GraphicsDispose($hGraphic)
_GDIPlus_BrushDispose($hBrush)

; Сохраняем битмап в файл для проверки того, что получилось
_GDIPlus_ImageSaveToFile($hBitmap, @ScriptDir & '\Test.png')

; Удаляем битмап
_GDIPlus_GraphicsDispose($hGraphic)

; Деинициализируем GDI+
_GDIPlus_Shutdown()

#Include <APIConstants.au3>
#Include <GDIP.au3>
#Include <GUIConstantsEx.au3>
#Include <StaticConstants.au3>
#Include <WinAPIEx.au3>

OnAutoItExitRegister('OnAutoItExit')

_GDIPlus_Startup()

$tRect = DllStructCreate($tagGDIPRECTF)
DllStructSetData($tRect, 1, 0)
DllStructSetData($tRect, 2, 0)
DllStructSetData($tRect, 3, 300)
DllStructSetData($tRect, 4, 50)
$hBrush1 = _GDIPlus_LineBrushCreateFromRect($tRect, 0xFFFFFFFF, 0x00FFFFFF, 1)
$hBrush2 = _GDIPlus_LineBrushCreateFromRect($tRect, 0x00FFFFFF, 0xFFFFFFFF, 1)

$hForm = GUICreate('MyGUI', 300, 200)

GUICtrlCreateLabel('', 0, 0, 300, 200)
GUICtrlSetState(-1, $GUI_DISABLE)
$hLabel = GUICtrlGetHandle(-1)

GUICtrlCreateLabel('Top Data' & @CRLF & @CRLF & @CRLF & @CRLF & @CRLF & @CRLF & 'Middle data' & @CRLF & @CRLF & @CRLF & @CRLF & @CRLF & @CRLF & 'Bottom Data', 20, 15, 260, 200, $SS_CENTER)

$hDll = DllCallbackRegister('_WinProc', 'ptr', 'hwnd;uint;wparam;lparam')
$pDll = DllCallbackGetPtr($hDll)
$hProc = _WinAPI_SetWindowLongEx($hLabel, $GWL_WNDPROC, $pDll)

GUISetState()

Do
Until GUIGetMsg() = -3

_GDIPlus_BrushDispose($hBrush1)
_GDIPlus_BrushDispose($hBrush2)
_GDIPlus_Shutdown()

Func _WinProc($hWnd, $iMsg, $wParam, $lParam)
	Switch $iMsg
		Case $WM_PAINT

			Local $tPAINT, $tRect, $hDC, $hGraphic

			$hDC = _WinAPI_BeginPaint($hWnd, $tPAINT)
			$hGraphic = _GDIPlus_GraphicsCreateFromHDC($hDC)
			_GDIPlus_GraphicsFillRect($hGraphic, 0, 0, 300, 50, $hBrush1)
			_GDIPlus_GraphicsFillRect($hGraphic, 0, 150, 300, 50, $hBrush2)
			_GDIPlus_GraphicsDispose($hGraphic)
			_WinAPI_EndPaint($hWnd, $tPAINT)
			Return 0
	EndSwitch
	Return _WinAPI_CallWindowProc($hProc, $hWnd, $iMsg, $wParam, $lParam)
EndFunc   ;==>_WinProc

Func OnAutoItExit()
	_WinAPI_SetWindowLongEx($hLabel, $GWL_WNDPROC, $hProc)
	DllCallbackFree($hDll)
EndFunc   ;==>OnAutoItExit