Aero Glass
This article applies to Wndows only.
See also: Multiplatform Programming Guide
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Aero Glass effect on Lazarus Form
First save the above code to a text file "glass.pas":
unit glass;
{$mode delphi}
//{$mode objfpc}{$H+}
interface
uses
Windows, Forms, Graphics;
type
_MARGINS = packed record
cxLeftWidth : Integer;
cxRightWidth : Integer;
cyTopHeight : Integer;
cyBottomHeight : Integer;
end;
PMargins = ^_MARGINS;
TMargins = _MARGINS;
DwmIsCompositionEnabledFunc = function(pfEnabled: PBoolean): HRESULT; stdcall;
DwmExtendFrameIntoClientAreaFunc = function(destWnd: HWND; const pMarInset: PMargins): HRESULT; stdcall;
SetLayeredWindowAttributesFunc = function(destWnd: HWND; cKey: TColor; bAlpha: Byte; dwFlags: DWord): BOOL; stdcall;
const
WS_EX_LAYERED = $80000;
LWA_COLORKEY = 1;
procedure GlassForm(frm: TForm; tmpMargins: TMargins; cBlurColorKey: TColor = clFuchsia);
function WindowsAeroGlassCompatible: Boolean;
implementation
function WindowsAeroGlassCompatible: Boolean;
var
osVinfo: TOSVERSIONINFO;
begin
ZeroMemory(@osVinfo, SizeOf(osVinfo));
OsVinfo.dwOSVersionInfoSize := SizeOf(TOSVERSIONINFO);
if (
(GetVersionEx(osVInfo) = True) and
(osVinfo.dwPlatformId = VER_PLATFORM_WIN32_NT) and
(osVinfo.dwMajorVersion >= 6)
)
then Result:=True
else Result:=False;
end;
procedure GlassForm(frm: TForm; tmpMargins: TMargins; cBlurColorKey: TColor = clFuchsia);
var
hDwmDLL: Cardinal;
fDwmIsCompositionEnabled: DwmIsCompositionEnabledFunc;
fDwmExtendFrameIntoClientArea: DwmExtendFrameIntoClientAreaFunc;
fSetLayeredWindowAttributesFunc: SetLayeredWindowAttributesFunc;
bCmpEnable: Boolean;
mgn: TMargins;
begin
{ Continue if Windows version is compatible }
if WindowsAeroGlassCompatible then begin
{ Continue if 'dwmapi' library is loaded }
hDwmDLL := LoadLibrary('dwmapi.dll');
if hDwmDLL <> 0 then begin
{ Get values }
@fDwmIsCompositionEnabled := GetProcAddress(hDwmDLL, 'DwmIsCompositionEnabled');
@fDwmExtendFrameIntoClientArea := GetProcAddress(hDwmDLL, 'DwmExtendFrameIntoClientArea');
@fSetLayeredWindowAttributesFunc := GetProcAddress(GetModulehandle(user32), 'SetLayeredWindowAttributes');
{ Continue if values are <> nil }
if (
(@fDwmIsCompositionEnabled <> nil) and
(@fDwmExtendFrameIntoClientArea <> nil) and
(@fSetLayeredWindowAttributesFunc <> nil)
)
then begin
{ Continue if composition is enabled }
fDwmIsCompositionEnabled(@bCmpEnable);
if bCmpEnable = True then begin
{ Set Form Color same as cBlurColorKey }
frm.Color := cBlurColorKey;
{ ... }
SetWindowLong(frm.Handle, GWL_EXSTYLE, GetWindowLong(frm.Handle, GWL_EXSTYLE) or WS_EX_LAYERED);
{ ... }
fSetLayeredWindowAttributesFunc(frm.Handle, cBlurColorKey, 0, LWA_COLORKEY);
{ Set margins }
ZeroMemory(@mgn, SizeOf(mgn));
mgn.cxLeftWidth := tmpMargins.cxLeftWidth;
mgn.cxRightWidth := tmpMargins.cxRightWidth;
mgn.cyTopHeight := tmpMargins.cyTopHeight;
mgn.cyBottomHeight := tmpMargins.cyBottomHeight;
{ Extend Form }
fDwmExtendFrameIntoClientArea(frm.Handle,@mgn);
end;
end;
{ Free loaded 'dwmapi' library }
FreeLibrary(hDWMDLL);
end;
end;
end;
end.
Copy the "glass.pas" file to the main folder of your project:
MyProject\glass.pas
In the "uses" section of your project you need to add "glass":
unit form1;
{$mode objfpc}{$H+}
interface
uses
Classes, SysUtils, FileUtil, Forms, Controls, Graphics, Dialogs
glass; // This includes GlassForm procedure
OnActivate event of each form call the procedure in this way:
procedure TForm1.FormActivate(Sender: TObject);
var
tmpMargins: TMargins;
begin
{ If all margins are -1 the whole form will be aero glass}
tmpMargins.cxLeftWidth := -1;
tmpMargins.cxRightWidth := -1;
tmpMargins.cyBottomHeight := -1;
tmpMargins.cyTopHeight := -1;
{ FormName ; Margins ; TransparentColor }
GlassForm(Form1, tmpMargins, clFuchsia);
end;
Also you need to enable Themes to use this procedure, go to Options > Project Options > then select "Use Manifest to Enable Themes (Windows)".
Bugs
As you can see in the first image Labels aren't displayed fine in Aero Glass, there are links with components and code that show how to make "Glow Labels":
Also if you clic the transparent part of the window the back window / desktop is selected (focus is lost in the form with aero glass).
About
This was converted to Lazarus using "{$mode delphi}" from "Aero Glass Effekt für Delphi-Forms, Delphi-Unit von Daniel Mitte (2006)":
There is a Delphi component here (to be ported in Lazarus):