窗体全透明但窗体上的控件不透明

相关资料：

https://www.iteye.com/blog/paulfzm-1835285

实例1：

unit Unit1;

interface

uses
  Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
  Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Vcl.ComCtrls;

type
  TForm1 = class(TForm)
    Button1: TButton;
    ListBox1: TListBox;
    Memo1: TMemo;
    Edit1: TEdit;
    ProgressBar1: TProgressBar;
    TrackBar1: TTrackBar;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
Var
  frmRegion, tempRegion: HRGN;
  I: Integer;
  Arect: TRect;
Begin
  frmRegion := 0;
  For I:= 0 To ControlCount - 1 Do
  Begin
    aRect := Controls[I].BoundsRect;
    OffsetRect(aRect, clientorigin.x - left, clientorigin.y - top);
    tempRegion := CreateRectRgnIndirect(aRect);
    If frmRegion = 0 Then
      frmRegion := tempRegion
    Else
    Begin
      CombineRgn(frmRegion, frmRegion, tempRegion, RGN_OR);
      DeleteObject(tempRegion);
    End;
  End;
  tempregion :=
  CreateRectRgn( 0, 0, Width,
                GetSystemMetrics(SM_CYCAPTION)+
                GetSystemMetrics(SM_CYSIZEFRAME)+
                GetSystemMetrics(SM_CYMENU) * Ord(Menu <> Nil));

  CombineRgn(frmRegion, frmRegion, tempRegion, RGN_OR);
  DeleteObject(tempRegion);
  SetWindowRgn(handle, frmRegion, true);
end;

end.

实例2：

unit Unit1;

interface

uses
  Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
  Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls;

type
  TForm1 = class(TForm)
    Button1: TButton;
    Edit1: TEdit;
    procedure FormCreate(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.FormCreate(Sender: TObject);
begin
form1.color:=clred;
form1.TransparentColorValue:=clred;
form1.TransparentColor:=true;
end;

end.