Aero Glass

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This article applies to Windows only.

See also: Multiplatform Programming Guide

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Aero Glass effect on Lazarus Form

aero glass lazarus.png

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(Self, 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):