CEF4Delphi/demos/Lazarus_Windows/SimpleBrowser/uSimpleBrowser.pas

unit uSimpleBrowser;

{$I ..\..\..\source\cef.inc}

interface

uses
  {$IFDEF DELPHI16_UP}
  Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
  Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Vcl.ExtCtrls,
  {$ELSE}
  Windows, Messages, SysUtils, Variants, Classes, Graphics,
  Controls, Forms, Dialogs, StdCtrls, ExtCtrls,
  {$ENDIF}
  uCEFChromium, uCEFWindowParent, uCEFChromiumWindow, uCEFTypes, uCEFInterfaces,
  uCEFWinControl;

type

  { TForm1 }

  TForm1 = class(TForm)
    ChromiumWindow1: TChromiumWindow;
    AddressPnl: TPanel;
    AddressEdt: TEdit;
    GoBtn: TButton;
    Timer1: TTimer;

    procedure GoBtnClick(Sender: TObject);
    procedure Timer1Timer(Sender: TObject);

    procedure FormShow(Sender: TObject);                         
    procedure FormCloseQuery(Sender: TObject; var CanClose: Boolean);
    procedure FormCreate(Sender: TObject);

    procedure ChromiumWindow1AfterCreated(Sender: TObject);
    procedure ChromiumWindow1Close(Sender: TObject);
  private
    // You have to handle this two messages to call NotifyMoveOrResizeStarted or some page elements will be misaligned.
    procedure WMMove(var aMessage : TWMMove); message WM_MOVE;
    procedure WMMoving(var aMessage : TMessage); message WM_MOVING;
    // You also have to handle these two messages to set GlobalCEFApp.OsmodalLoop
    procedure WMEnterMenuLoop(var aMessage: TMessage); message WM_ENTERMENULOOP;
    procedure WMExitMenuLoop(var aMessage: TMessage); message WM_EXITMENULOOP;

  protected
    // Variables to control when can we destroy the form safely
    FCanClose : boolean;  // Set to True in TChromium.OnClose
    FClosing  : boolean;  // Set to True in the CloseQuery event.

    procedure Chromium_OnBeforePopup(Sender: TObject; const browser: ICefBrowser; const frame: ICefFrame; const targetUrl, targetFrameName: ustring; targetDisposition: TCefWindowOpenDisposition; userGesture: Boolean; const popupFeatures: TCefPopupFeatures; var windowInfo: TCefWindowInfo; var client: ICefClient; var settings: TCefBrowserSettings; var extra_info: ICefDictionaryValue; var noJavascriptAccess: Boolean; var Result: Boolean);

  public
    { Public declarations }
  end;

var
  Form1: TForm1;


implementation

{$R *.lfm}

uses
  uCEFApplication;

// This is a demo with the simplest web browser you can build using CEF4Delphi and
// it doesn't show any sign of progress like other web browsers do.

// Remember that it may take a few seconds to load if Windows update, your antivirus or
// any other windows service is using your hard drive.

// Depending on your internet connection it may take longer than expected.

// This demo uses a TChromiumWindow component which should *ONLY* be used for extremely
// simple applications with a simple browser. For any other configuration it's
// recommended using a TChromium with a TCEFWindowParent as shown in the SimpleBrowser2 demo.

// Please check that your firewall or antivirus are not blocking this application
// or the domain "google.com". If you don't live in the US, you'll be redirected to
// another domain which will take a little time too.

// Destruction steps
// =================
// 1. The FormCloseQuery event sets CanClose to False and calls TChromiumWindow.CloseBrowser,
//    which triggers the TChromiumWindow.OnClose event.
// 2. The TChromiumWindow.OnClose sets FCanClose to true and sends WM_CLOSE to the form.
                 
procedure TForm1.FormCloseQuery(Sender: TObject; var CanClose: Boolean);
begin
  CanClose := FCanClose;

  if not(FClosing) then
    begin
      FClosing := True;
      Visible  := False;
      ChromiumWindow1.CloseBrowser(True);
    end;
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
  FCanClose := False;
  FClosing  := False;     

  // The browser will load the URL in AddressEdt initially.
  ChromiumWindow1.ChromiumBrowser.DefaultURL := AddressEdt.Text;
end;

procedure TForm1.FormShow(Sender: TObject);
begin
  // For simplicity, this demo blocks all popup windows and new tabs
  ChromiumWindow1.ChromiumBrowser.OnBeforePopup := Chromium_OnBeforePopup;

  // You *MUST* call CreateBrowser to create and initialize the browser.
  // This will trigger the AfterCreated event when the browser is fully
  // initialized and ready to receive commands.

  // GlobalCEFApp.GlobalContextInitialized has to be TRUE before creating any browser
  // If it's not initialized yet, we use a simple timer to create the browser later.
  if not(ChromiumWindow1.CreateBrowser) then Timer1.Enabled := True;
end;

procedure TForm1.ChromiumWindow1Close(Sender: TObject);
begin
  FCanClose := True;
  PostMessage(Handle, WM_CLOSE, 0, 0);
end;

procedure TForm1.Chromium_OnBeforePopup(      Sender             : TObject;
                                        const browser            : ICefBrowser;
                                        const frame              : ICefFrame;
                                        const targetUrl          : ustring;
                                        const targetFrameName    : ustring;
                                              targetDisposition  : TCefWindowOpenDisposition;
                                              userGesture        : Boolean;
                                        const popupFeatures      : TCefPopupFeatures;
                                        var   windowInfo         : TCefWindowInfo;
                                        var   client             : ICefClient;
                                        var   settings           : TCefBrowserSettings;
                                        var   extra_info         : ICefDictionaryValue;
                                        var   noJavascriptAccess : Boolean;
                                        var   Result             : Boolean);
begin
  // For simplicity, this demo blocks all popup windows and new tabs
  Result := (targetDisposition in [CEF_WOD_NEW_FOREGROUND_TAB, CEF_WOD_NEW_BACKGROUND_TAB, CEF_WOD_NEW_POPUP, CEF_WOD_NEW_WINDOW]);
end;

procedure TForm1.ChromiumWindow1AfterCreated(Sender: TObject);
begin
  Caption            := 'Simple Browser';
  AddressPnl.Enabled := True;
end;

procedure TForm1.GoBtnClick(Sender: TObject);
begin
  // This will load the URL in the edit box
  ChromiumWindow1.LoadURL(AddressEdt.Text);
end;

procedure TForm1.Timer1Timer(Sender: TObject);
begin
  Timer1.Enabled := False;
  if not(ChromiumWindow1.CreateBrowser) and not(ChromiumWindow1.Initialized) then
    Timer1.Enabled := True;
end;

procedure TForm1.WMMove(var aMessage : TWMMove);
begin
  inherited;

  if (ChromiumWindow1 <> nil) then ChromiumWindow1.NotifyMoveOrResizeStarted;
end;

procedure TForm1.WMMoving(var aMessage : TMessage);
begin
  inherited;

  if (ChromiumWindow1 <> nil) then ChromiumWindow1.NotifyMoveOrResizeStarted;
end;

procedure TForm1.WMEnterMenuLoop(var aMessage: TMessage);
begin
  inherited;

  if (aMessage.wParam = 0) and (GlobalCEFApp <> nil) then GlobalCEFApp.OsmodalLoop := True;
end;

procedure TForm1.WMExitMenuLoop(var aMessage: TMessage);
begin
  inherited;

  if (aMessage.wParam = 0) and (GlobalCEFApp <> nil) then GlobalCEFApp.OsmodalLoop := False;
end;

end.