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CEF4Delphi/demos/Delphi_VCL/DOMVisitor/uDOMVisitor.pas
Salvador Díaz Fau fd1e936198 Update to CEF 79.0.10
- Removed CEFSentinel from some demos because it's no longer necessary.
- Updated copyright year.
2020-01-01 12:48:10 +01:00

589 lines
20 KiB
ObjectPascal

// ************************************************************************
// ***************************** CEF4Delphi *******************************
// ************************************************************************
//
// CEF4Delphi is based on DCEF3 which uses CEF to embed a chromium-based
// browser in Delphi applications.
//
// The original license of DCEF3 still applies to CEF4Delphi.
//
// For more information about CEF4Delphi visit :
// https://www.briskbard.com/index.php?lang=en&pageid=cef
//
// Copyright © 2020 Salvador Diaz Fau. All rights reserved.
//
// ************************************************************************
// ************ vvvv Original license and comments below vvvv *************
// ************************************************************************
(*
* Delphi Chromium Embedded 3
*
* Usage allowed under the restrictions of the Lesser GNU General Public License
* or alternatively the restrictions of the Mozilla Public License 1.1
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for
* the specific language governing rights and limitations under the License.
*
* Unit owner : Henri Gourvest <hgourvest@gmail.com>
* Web site : http://www.progdigy.com
* Repository : http://code.google.com/p/delphichromiumembedded/
* Group : http://groups.google.com/group/delphichromiumembedded
*
* Embarcadero Technologies, Inc is not permitted to use or redistribute
* this source code without explicit permission.
*
*)
unit uDOMVisitor;
{$I cef.inc}
interface
uses
{$IFDEF DELPHI16_UP}
Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics, Vcl.Menus,
Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Vcl.ExtCtrls, System.Types, Vcl.ComCtrls, Vcl.ClipBrd,
System.UITypes,
{$ELSE}
Windows, Messages, SysUtils, Variants, Classes, Graphics, Menus,
Controls, Forms, Dialogs, StdCtrls, ExtCtrls, Types, ComCtrls, ClipBrd,
{$ENDIF}
uCEFChromium, uCEFWindowParent, uCEFInterfaces, uCEFApplication, uCEFTypes, uCEFConstants,
uCEFWinControl, uCEFSentinel, uCEFChromiumCore;
const
MINIBROWSER_VISITDOM_PARTIAL = WM_APP + $101;
MINIBROWSER_VISITDOM_FULL = WM_APP + $102;
MINIBROWSER_COPYFRAMEIDS_1 = WM_APP + $103;
MINIBROWSER_COPYFRAMEIDS_2 = WM_APP + $104;
MINIBROWSER_CONTEXTMENU_VISITDOM_PARTIAL = MENU_ID_USER_FIRST + 1;
MINIBROWSER_CONTEXTMENU_VISITDOM_FULL = MENU_ID_USER_FIRST + 2;
MINIBROWSER_CONTEXTMENU_COPYFRAMEIDS_1 = MENU_ID_USER_FIRST + 3;
MINIBROWSER_CONTEXTMENU_COPYFRAMEIDS_2 = MENU_ID_USER_FIRST + 4;
DOMVISITOR_MSGNAME_PARTIAL = 'domvisitorpartial';
DOMVISITOR_MSGNAME_FULL = 'domvisitorfull';
RETRIEVEDOM_MSGNAME_PARTIAL = 'retrievedompartial';
RETRIEVEDOM_MSGNAME_FULL = 'retrievedomfull';
FRAMEIDS_MSGNAME = 'getframeids';
type
TDOMVisitorFrm = class(TForm)
CEFWindowParent1: TCEFWindowParent;
Chromium1: TChromium;
AddressBarPnl: TPanel;
AddressEdt: TEdit;
StatusBar1: TStatusBar;
Timer1: TTimer;
Panel1: TPanel;
GoBtn: TButton;
VisitDOMBtn: TButton;
procedure GoBtnClick(Sender: TObject);
procedure FormShow(Sender: TObject);
procedure Chromium1AfterCreated(Sender: TObject;
const browser: ICefBrowser);
procedure Chromium1BeforeContextMenu(Sender: TObject;
const browser: ICefBrowser; const frame: ICefFrame;
const params: ICefContextMenuParams; const model: ICefMenuModel);
procedure Chromium1ContextMenuCommand(Sender: TObject;
const browser: ICefBrowser; const frame: ICefFrame;
const params: ICefContextMenuParams; commandId: Integer;
eventFlags: Cardinal; out Result: Boolean);
procedure Chromium1ProcessMessageReceived(Sender: TObject;
const browser: ICefBrowser; const frame: ICefFrame; sourceProcess: TCefProcessId;
const message: ICefProcessMessage; out Result: Boolean);
procedure Timer1Timer(Sender: TObject);
procedure VisitDOMBtnClick(Sender: TObject);
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 FormCreate(Sender: TObject);
procedure FormCloseQuery(Sender: TObject; var CanClose: Boolean);
procedure Chromium1Close(Sender: TObject; const browser: ICefBrowser;
var aAction : TCefCloseBrowserAction);
procedure Chromium1BeforeClose(Sender: TObject;
const browser: ICefBrowser);
private
{ Private declarations }
protected
// Variables to control when can we destroy the form safely
FCanClose : boolean; // Set to True in TChromium.OnBeforeClose
FClosing : boolean; // Set to True in the CloseQuery event.
procedure BrowserCreatedMsg(var aMessage : TMessage); message CEF_AFTERCREATED;
procedure BrowserDestroyMsg(var aMessage : TMessage); message CEF_DESTROY;
procedure VisitDOMMsg(var aMessage : TMessage); message MINIBROWSER_VISITDOM_PARTIAL;
procedure VisitDOM2Msg(var aMessage : TMessage); message MINIBROWSER_VISITDOM_FULL;
procedure CopyFrameIDs1(var aMessage : TMessage); message MINIBROWSER_COPYFRAMEIDS_1;
procedure CopyFrameIDs2(var aMessage : TMessage); message MINIBROWSER_COPYFRAMEIDS_2;
procedure WMMove(var aMessage : TWMMove); message WM_MOVE;
procedure WMMoving(var aMessage : TMessage); message WM_MOVING;
procedure ShowStatusText(const aText : string);
public
{ Public declarations }
end;
var
DOMVisitorFrm: TDOMVisitorFrm;
procedure CreateGlobalCEFApp;
implementation
{$R *.dfm}
uses
uCEFProcessMessage, uCEFMiscFunctions, uCEFSchemeRegistrar, uCEFRenderProcessHandler,
uCEFv8Handler, uCEFDomVisitor, uCEFDomNode, uCEFTask;
// This demo sends messages from the browser process to the render process,
// and from the render process to the browser process.
// To send a message from the browser process you must use the TChromium.SendProcessMessage
// procedure with a PID_RENDERER parameter. The render process receives those messages in
// the GlobalCEFApp.OnProcessMessageReceived event.
// To send messages from the render process you must use the frame.SendProcessMessage
// procedure with a PID_BROWSER parameter. The browser process receives those messages in
// the TChromium.OnProcessMessageReceived event.
// message.name is used to identify different messages sent with SendProcessMessage.
// The OnProcessMessageReceived event can recognize any number of messages identifying them
// by message.name
// Destruction steps
// =================
// 1. FormCloseQuery sets CanClose to FALSE calls TChromium.CloseBrowser which triggers the TChromium.OnClose event.
// 2. TChromium.OnClose sends a CEFBROWSER_DESTROY message to destroy CEFWindowParent1 in the main thread, which triggers the TChromium.OnBeforeClose event.
// 3. TChromium.OnBeforeClose sets FCanClose := True and sends WM_CLOSE to the form.
procedure SimpleDOMIteration(const aDocument: ICefDomDocument);
var
TempHead, TempChild : ICefDomNode;
begin
try
if (aDocument <> nil) then
begin
TempHead := aDocument.Head;
if (TempHead <> nil) then
begin
TempChild := TempHead.FirstChild;
while (TempChild <> nil) do
begin
CefLog('CEF4Delphi', 1, CEF_LOG_SEVERITY_ERROR, 'Head child element : ' + TempChild.Name);
TempChild := TempChild.NextSibling;
end;
end;
end;
except
on e : exception do
if CustomExceptionHandler('SimpleDOMIteration', e) then raise;
end;
end;
procedure SimpleNodeSearch(const aDocument: ICefDomDocument);
const
NODE_ID = 'lst-ib'; // input box node found in google.com homepage
var
TempNode : ICefDomNode;
begin
try
if (aDocument <> nil) then
begin
TempNode := aDocument.GetElementById(NODE_ID);
if (TempNode <> nil) then
begin
CefLog('CEF4Delphi', 1, CEF_LOG_SEVERITY_ERROR, NODE_ID + ' element name : ' + TempNode.Name);
CefLog('CEF4Delphi', 1, CEF_LOG_SEVERITY_ERROR, NODE_ID + ' element value : ' + TempNode.GetValue);
end;
TempNode := aDocument.GetFocusedNode;
if (TempNode <> nil) then
begin
CefLog('CEF4Delphi', 1, CEF_LOG_SEVERITY_ERROR, 'Focused element name : ' + TempNode.Name);
CefLog('CEF4Delphi', 1, CEF_LOG_SEVERITY_ERROR, 'Focused element inner text : ' + TempNode.ElementInnerText);
end;
end;
except
on e : exception do
if CustomExceptionHandler('SimpleNodeSearch', e) then raise;
end;
end;
procedure DOMVisitor_OnDocAvailable(const browser: ICefBrowser; const frame: ICefFrame; const document: ICefDomDocument);
var
TempMessage : ICefProcessMessage;
begin
// This function is called from a different process.
// document is only valid inside this function.
// As an example, this function only writes the document title to the 'debug.log' file.
CefLog('CEF4Delphi', 1, CEF_LOG_SEVERITY_ERROR, 'document.Title : ' + document.Title);
if document.HasSelection then
CefLog('CEF4Delphi', 1, CEF_LOG_SEVERITY_ERROR, 'document.SelectionAsText : ' + quotedstr(document.SelectionAsText))
else
CefLog('CEF4Delphi', 1, CEF_LOG_SEVERITY_ERROR, 'document.HasSelection : False');
// Simple DOM iteration example
SimpleDOMIteration(document);
// Simple DOM searches
SimpleNodeSearch(document);
// Sending back some custom results to the browser process
// Notice that the DOMVISITOR_MSGNAME_PARTIAL message name needs to be recognized in
// Chromium1ProcessMessageReceived
try
TempMessage := TCefProcessMessageRef.New(DOMVISITOR_MSGNAME_PARTIAL);
TempMessage.ArgumentList.SetString(0, 'document.Title : ' + document.Title);
if (frame <> nil) and frame.IsValid then
frame.SendProcessMessage(PID_BROWSER, TempMessage);
finally
TempMessage := nil;
end;
end;
procedure DOMVisitor_OnDocAvailableFullMarkup(const browser: ICefBrowser; const frame: ICefFrame; const document: ICefDomDocument);
var
TempMessage : ICefProcessMessage;
begin
// Sending back some custom results to the browser process
// Notice that the DOMVISITOR_MSGNAME_FULL message name needs to be recognized in
// Chromium1ProcessMessageReceived
try
TempMessage := TCefProcessMessageRef.New(DOMVISITOR_MSGNAME_FULL);
TempMessage.ArgumentList.SetString(0, document.Body.AsMarkup);
if (frame <> nil) and frame.IsValid then
frame.SendProcessMessage(PID_BROWSER, TempMessage);
finally
TempMessage := nil;
end;
end;
procedure DOMVisitor_GetFrameIDs(const browser: ICefBrowser; const frame : ICefFrame);
var
i : NativeUInt;
TempCount : NativeUInt;
TempArray : TCefFrameIdentifierArray;
TempString : string;
TempMsg : ICefProcessMessage;
begin
TempCount := browser.FrameCount;
if browser.GetFrameIdentifiers(TempCount, TempArray) then
begin
TempString := '';
i := 0;
while (i < TempCount) do
begin
TempString := TempString + inttostr(TempArray[i]) + CRLF;
inc(i);
end;
try
TempMsg := TCefProcessMessageRef.New(FRAMEIDS_MSGNAME);
TempMsg.ArgumentList.SetString(0, TempString);
if (frame <> nil) and frame.IsValid then
frame.SendProcessMessage(PID_BROWSER, TempMsg);
finally
TempMsg := nil;
end;
end;
end;
procedure GlobalCEFApp_OnProcessMessageReceived(const browser : ICefBrowser;
const frame : ICefFrame;
sourceProcess : TCefProcessId;
const message : ICefProcessMessage;
var aHandled : boolean);
var
TempVisitor : TCefFastDomVisitor2;
begin
aHandled := False;
if (browser <> nil) then
begin
if (message.name = RETRIEVEDOM_MSGNAME_PARTIAL) then
begin
if (frame <> nil) and frame.IsValid then
begin
TempVisitor := TCefFastDomVisitor2.Create(browser, frame, DOMVisitor_OnDocAvailable);
frame.VisitDom(TempVisitor);
end;
aHandled := True;
end
else
if (message.name = RETRIEVEDOM_MSGNAME_FULL) then
begin
if (frame <> nil) and frame.IsValid then
begin
TempVisitor := TCefFastDomVisitor2.Create(browser, frame, DOMVisitor_OnDocAvailableFullMarkup);
frame.VisitDom(TempVisitor);
end;
aHandled := True;
end
else
if (message.name = FRAMEIDS_MSGNAME) then
begin
DOMVisitor_GetFrameIDs(browser, frame);
aHandled := True;
end;
end;
end;
procedure CreateGlobalCEFApp;
begin
GlobalCEFApp := TCefApplication.Create;
GlobalCEFApp.RemoteDebuggingPort := 9000;
GlobalCEFApp.OnProcessMessageReceived := GlobalCEFApp_OnProcessMessageReceived;
// Enabling the debug log file for then DOM visitor demo.
// This adds lots of warnings to the console, specially if you run this inside VirtualBox.
// Remove it if you don't want to use the DOM visitor
GlobalCEFApp.LogFile := 'debug.log';
GlobalCEFApp.LogSeverity := LOGSEVERITY_INFO;
end;
procedure TDOMVisitorFrm.Chromium1AfterCreated(Sender: TObject; const browser: ICefBrowser);
begin
PostMessage(Handle, CEF_AFTERCREATED, 0, 0);
end;
procedure TDOMVisitorFrm.Chromium1BeforeClose(Sender: TObject;
const browser: ICefBrowser);
begin
FCanClose := True;
PostMessage(Handle, WM_CLOSE, 0, 0);
end;
procedure TDOMVisitorFrm.Chromium1BeforeContextMenu(Sender: TObject;
const browser: ICefBrowser; const frame: ICefFrame;
const params: ICefContextMenuParams; const model: ICefMenuModel);
begin
model.AddItem(MINIBROWSER_CONTEXTMENU_VISITDOM_PARTIAL, 'Visit DOM in CEF (only Title)');
model.AddItem(MINIBROWSER_CONTEXTMENU_VISITDOM_FULL, 'Visit DOM in CEF (BODY HTML)');
model.AddItem(MINIBROWSER_CONTEXTMENU_COPYFRAMEIDS_1, 'Copy frame IDs in the browser process');
model.AddItem(MINIBROWSER_CONTEXTMENU_COPYFRAMEIDS_2, 'Copy frame IDs in the render process');
end;
procedure TDOMVisitorFrm.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 TDOMVisitorFrm.Chromium1Close(Sender: TObject;
const browser: ICefBrowser; var aAction : TCefCloseBrowserAction);
begin
PostMessage(Handle, CEF_DESTROY, 0, 0);
aAction := cbaDelay;
end;
procedure TDOMVisitorFrm.Chromium1ContextMenuCommand(Sender: TObject;
const browser: ICefBrowser; const frame: ICefFrame;
const params: ICefContextMenuParams; commandId: Integer;
eventFlags: Cardinal; out Result: Boolean);
begin
Result := False;
case commandId of
MINIBROWSER_CONTEXTMENU_VISITDOM_PARTIAL :
PostMessage(Handle, MINIBROWSER_VISITDOM_PARTIAL, 0, 0);
MINIBROWSER_CONTEXTMENU_VISITDOM_FULL :
PostMessage(Handle, MINIBROWSER_VISITDOM_FULL, 0, 0);
MINIBROWSER_CONTEXTMENU_COPYFRAMEIDS_1 :
PostMessage(Handle, MINIBROWSER_COPYFRAMEIDS_1, 0, 0);
MINIBROWSER_CONTEXTMENU_COPYFRAMEIDS_2 :
PostMessage(Handle, MINIBROWSER_COPYFRAMEIDS_2, 0, 0);
end;
end;
procedure TDOMVisitorFrm.Chromium1ProcessMessageReceived(Sender: TObject;
const browser: ICefBrowser; const frame: ICefFrame; sourceProcess: TCefProcessId;
const message: ICefProcessMessage; out Result: Boolean);
begin
Result := False;
if (message = nil) or (message.ArgumentList = nil) then exit;
// Message received from the DOMVISITOR in CEF
if (message.Name = DOMVISITOR_MSGNAME_PARTIAL) then
begin
ShowStatusText('DOM Visitor result text : ' + message.ArgumentList.GetString(0));
Result := True;
end
else
if (message.Name = DOMVISITOR_MSGNAME_FULL) then
begin
Clipboard.AsText := message.ArgumentList.GetString(0);
ShowStatusText('HTML copied to the clipboard');
Result := True;
end
else
if (message.Name = FRAMEIDS_MSGNAME) then
begin
Clipboard.AsText := message.ArgumentList.GetString(0);
ShowStatusText('Frame IDs copied to the clipboard in the render process.');
Result := True;
end;
end;
procedure TDOMVisitorFrm.FormCloseQuery(Sender: TObject;
var CanClose: Boolean);
begin
CanClose := FCanClose;
if not(FClosing) then
begin
FClosing := True;
Visible := False;
Chromium1.CloseBrowser(True);
end;
end;
procedure TDOMVisitorFrm.FormCreate(Sender: TObject);
begin
FCanClose := False;
FClosing := False;
end;
procedure TDOMVisitorFrm.FormShow(Sender: TObject);
begin
// 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(Chromium1.CreateBrowser(CEFWindowParent1, '')) then Timer1.Enabled := True;
end;
procedure TDOMVisitorFrm.GoBtnClick(Sender: TObject);
begin
Chromium1.LoadURL(AddressEdt.Text);
end;
procedure TDOMVisitorFrm.BrowserCreatedMsg(var aMessage : TMessage);
begin
CEFWindowParent1.UpdateSize;
AddressBarPnl.Enabled := True;
GoBtn.Click;
end;
procedure TDOMVisitorFrm.BrowserDestroyMsg(var aMessage : TMessage);
begin
CEFWindowParent1.Free;
end;
procedure TDOMVisitorFrm.VisitDOMBtnClick(Sender: TObject);
begin
PostMessage(Handle, MINIBROWSER_VISITDOM_PARTIAL, 0, 0);
end;
procedure TDOMVisitorFrm.VisitDOMMsg(var aMessage : TMessage);
var
TempMsg : ICefProcessMessage;
begin
// Use the ArgumentList property if you need to pass some parameters.
TempMsg := TCefProcessMessageRef.New(RETRIEVEDOM_MSGNAME_PARTIAL); // Same name than TCefCustomRenderProcessHandler.MessageName
Chromium1.SendProcessMessage(PID_RENDERER, TempMsg);
end;
procedure TDOMVisitorFrm.VisitDOM2Msg(var aMessage : TMessage);
var
TempMsg : ICefProcessMessage;
begin
// Use the ArgumentList property if you need to pass some parameters.
TempMsg := TCefProcessMessageRef.New(RETRIEVEDOM_MSGNAME_FULL); // Same name than TCefCustomRenderProcessHandler.MessageName
Chromium1.SendProcessMessage(PID_RENDERER, TempMsg);
end;
procedure TDOMVisitorFrm.CopyFrameIDs1(var aMessage : TMessage);
var
i : NativeUInt;
TempCount : NativeUInt;
TempArray : TCefFrameIdentifierArray;
TempString : string;
begin
TempCount := Chromium1.FrameCount;
if Chromium1.GetFrameIdentifiers(TempCount, TempArray) then
begin
TempString := '';
i := 0;
while (i < TempCount) do
begin
TempString := TempString + inttostr(TempArray[i]) + CRLF;
inc(i);
end;
clipboard.AsText := TempString;
ShowStatusText('Frame IDs copied to the clipboard in the browser process (' + inttostr(TempCount) + ')');
end;
end;
procedure TDOMVisitorFrm.CopyFrameIDs2(var aMessage : TMessage);
var
TempMsg : ICefProcessMessage;
begin
TempMsg := TCefProcessMessageRef.New(FRAMEIDS_MSGNAME);
Chromium1.SendProcessMessage(PID_RENDERER, TempMsg);
end;
procedure TDOMVisitorFrm.WMMove(var aMessage : TWMMove);
begin
inherited;
if (Chromium1 <> nil) then Chromium1.NotifyMoveOrResizeStarted;
end;
procedure TDOMVisitorFrm.WMMoving(var aMessage : TMessage);
begin
inherited;
if (Chromium1 <> nil) then Chromium1.NotifyMoveOrResizeStarted;
end;
procedure TDOMVisitorFrm.ShowStatusText(const aText : string);
begin
StatusBar1.Panels[0].Text := aText;
end;
procedure TDOMVisitorFrm.Timer1Timer(Sender: TObject);
begin
Timer1.Enabled := False;
if not(Chromium1.CreateBrowser(CEFWindowParent1, '')) and not(Chromium1.Initialized) then
Timer1.Enabled := True;
end;
end.