CEF4Delphi/demos/Lazarus_any_OS/BrowserWindowDom/uBrowserWindowDom.pas

unit uBrowserWindowDom;

{$mode objfpc}{$H+}
{$IFDEF MSWINDOWS}{$I ..\..\..\source\cef.inc}{$ELSE}{$I ../../../source/cef.inc}{$ENDIF}

interface

uses
  GlobalCefApplication,
  uCEFLazarusCocoa, // required for Cocoa
  SysUtils, Messages, Forms, Controls,
  Dialogs, ExtCtrls, StdCtrls, LMessages, Menus,
  uCEFTypes, uCEFInterfaces, uHelperProcessDom,
  uCEFWorkScheduler, uCEFBrowserWindow, uCEFProcessMessage, Classes;

type

  { TForm1 }

  TForm1 = class(TForm)
    AddressEdt: TComboBox;
    GoBtn: TButton;
    AddressPnl: TPanel;
    BrowserWindow1: TBrowserWindow;
    mDomHere: TMenuItem;

    procedure Chromium1BeforePopup(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);
    procedure Chromium1OpenUrlFromTab(Sender: TObject; const browser: ICefBrowser; const frame: ICefFrame; const targetUrl: ustring; targetDisposition: TCefWindowOpenDisposition; userGesture: Boolean; out Result: Boolean);
    procedure FormCloseQuery(Sender: TObject; var CanClose: Boolean);
    procedure FormCreate(Sender: TObject);

    procedure GoBtnClick(Sender: TObject);
    procedure BrowserWindow1BrowserClosed(Sender: TObject);
  private
    FContextXY: TPoint;

    procedure DoBeforeContextMenu(Sender: TObject; const browser: ICefBrowser;
      const frame: ICefFrame; const params: ICefContextMenuParams;
      const model: ICefMenuModel);
    procedure DoCaptureMenuXY;
    procedure DoContextMenuCmd(Sender: TObject; const browser: ICefBrowser;
      const frame: ICefFrame; const params: ICefContextMenuParams;
      commandId: Integer; eventFlags: TCefEventFlags; out Result: Boolean);
    procedure DoProcessMessageReceived(Sender: TObject;
      const browser: ICefBrowser; const frame: ICefFrame;
      sourceProcess: TCefProcessId; const message: ICefProcessMessage; out
      Result: Boolean);
  protected
    {$IFDEF WINDOWS}
    procedure WMEnterMenuLoop(var aMessage: TMessage); message WM_ENTERMENULOOP;
    procedure WMExitMenuLoop(var aMessage: TMessage); message WM_EXITMENULOOP;
    {$ENDIF}

  public

  end;

var
  Form1: TForm1;


implementation

{$R *.lfm}

// 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.

// 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.

// This demo uses a TChromium and a TCEFLinkedWindowParent

// We need to use TCEFLinkedWindowParent in Linux to update the browser
// visibility and size automatically.

// Destruction steps
// =================
// 1. FormCloseQuery sets CanClose to FALSE calls TChromium.CloseBrowser which triggers the TChromium.OnClose event.
// 2. TChromium.OnClose sets aAction to cbaClose to destroy the browser, which triggers the TChromium.OnBeforeClose event.
// 3. TChromium.OnBeforeClose sets FCanClose := True and sends CEF_BEFORECLOSE to close the form.

uses
  uCEFApplication;

{ TForm1 }

procedure TForm1.GoBtnClick(Sender: TObject);
begin
  BrowserWindow1.LoadURL(UTF8Decode(AddressEdt.Text));
end;

procedure TForm1.BrowserWindow1BrowserClosed(Sender: TObject);
begin
  Close;
end;

procedure TForm1.DoBeforeContextMenu(Sender: TObject;
  const browser: ICefBrowser; const frame: ICefFrame;
  const params: ICefContextMenuParams; const model: ICefMenuModel);
begin
  model.Clear;
  model.AddItem(1, 'Get DOM');
  TThread.Synchronize(nil, @DoCaptureMenuXY);
end;

procedure TForm1.DoCaptureMenuXY;
begin
  FContextXY := BrowserWindow1.ScreenToClient(Mouse.CursorPos);
end;

procedure TForm1.DoContextMenuCmd(Sender: TObject; const browser: ICefBrowser;
  const frame: ICefFrame; const params: ICefContextMenuParams;
  commandId: Integer; eventFlags: TCefEventFlags; out Result: Boolean);
var
  TempMsg : ICefProcessMessage;
begin
  if commandId = 1 then
    begin
      TempMsg := TCefProcessMessageRef.New(MSG_REQUEST_DOM); // Same name than TCefCustomRenderProcessHandler.MessageName
      TempMsg.ArgumentList.SetInt(0, FContextXY.X);
      TempMsg.ArgumentList.SetInt(1, FContextXY.Y);
      BrowserWindow1.Chromium.SendProcessMessage(PID_RENDERER, TempMsg);
    end;
end;

procedure TForm1.DoProcessMessageReceived(Sender: TObject;
  const browser: ICefBrowser; const frame: ICefFrame;
  sourceProcess: TCefProcessId; const message: ICefProcessMessage; out
  Result: Boolean);
begin
  Result := False;
  case message.Name of
    MSG_RESPONSE_DOM: begin
      Caption := message.ArgumentList.GetString(0);
      Result := True;
    end;
  end;
end;

{$IFDEF WINDOWS}
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;
{$ENDIF}

procedure TForm1.Chromium1BeforePopup(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);
begin
  // For simplicity, this demo blocks all popup windows and new tabs
  Result := (targetDisposition in [WOD_NEW_FOREGROUND_TAB, WOD_NEW_BACKGROUND_TAB, WOD_NEW_POPUP, WOD_NEW_WINDOW]);
end;

procedure TForm1.Chromium1OpenUrlFromTab(Sender: TObject;
  const browser: ICefBrowser; const frame: ICefFrame; const targetUrl: ustring;
  targetDisposition: TCefWindowOpenDisposition; userGesture: Boolean; out
  Result: Boolean);
begin
  // For simplicity, this demo blocks all popup windows and new tabs
  Result := (targetDisposition in [WOD_NEW_FOREGROUND_TAB, WOD_NEW_BACKGROUND_TAB, WOD_NEW_POPUP, WOD_NEW_WINDOW]);
end;

procedure TForm1.FormCloseQuery(Sender: TObject; var CanClose: Boolean);
begin
  BrowserWindow1.CloseBrowser(True);

  CanClose := BrowserWindow1.IsClosed;
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
  BrowserWindow1.Chromium.OnBeforeContextMenu := @DoBeforeContextMenu;
  BrowserWindow1.Chromium.OnContextMenuCommand := @DoContextMenuCmd;
  BrowserWindow1.Chromium.OnProcessMessageReceived := @DoProcessMessageReceived;

  BrowserWindow1.LoadURL(UTF8Decode(AddressEdt.Text));
end;

initialization
  {$IFDEF DARWIN}  // $IFDEF MACOSX
  AddCrDelegate;
  {$ENDIF}
  if GlobalCEFApp = nil then begin
    CreateGlobalCEFApp;
    if not GlobalCEFApp.StartMainProcess then begin
      DestroyGlobalCEFApp;
      DestroyGlobalCEFWorkScheduler;
      halt(0); // exit the subprocess
    end;
  end;

finalization
  (* Destroy from this unit, which is used after "Interfaces". So this happens before the Application object is destroyed *)
  if GlobalCEFWorkScheduler <> nil then
    GlobalCEFWorkScheduler.StopScheduler;
  DestroyGlobalCEFApp;
  DestroyGlobalCEFWorkScheduler;

end.