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Added ConsoleBrowser2 and WebpageSnapshot demos
- Split the Lazarus demos directory into "Lazarus_Windows" and "Lazarus_Linux". - Added OSRExternalPumpBrowser and TinyBrowser2 demos to "Lazarus_Linux". - Set TBufferPanel.GetScreenScale as virtual. - Added DevTools to the SchemeRegistrationBrowser demo. - Modified the SchemeRegistrationBrowser demo to receive XMLHttpRequest requests from JavaScript.
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Salvador Diaz Fau
248
demos/Lazarus_Windows/CustomResourceBrowser/uMainForm.pas
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248
demos/Lazarus_Windows/CustomResourceBrowser/uMainForm.pas
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// ************************************************************************
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// ***************************** CEF4Delphi *******************************
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// ************************************************************************
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//
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// CEF4Delphi is based on DCEF3 which uses CEF to embed a chromium-based
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// browser in Delphi applications.
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//
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// The original license of DCEF3 still applies to CEF4Delphi.
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//
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// For more information about CEF4Delphi visit :
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// https://www.briskbard.com/index.php?lang=en&pageid=cef
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//
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// Copyright � 2020 Salvador Diaz Fau. All rights reserved.
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//
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// ************************************************************************
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// ************ vvvv Original license and comments below vvvv *************
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// ************************************************************************
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(*
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* Delphi Chromium Embedded 3
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*
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* Usage allowed under the restrictions of the Lesser GNU General Public License
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* or alternatively the restrictions of the Mozilla Public License 1.1
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for
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* the specific language governing rights and limitations under the License.
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*
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* Unit owner : Henri Gourvest <hgourvest@gmail.com>
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* Web site : http://www.progdigy.com
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* Repository : http://code.google.com/p/delphichromiumembedded/
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* Group : http://groups.google.com/group/delphichromiumembedded
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*
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* Embarcadero Technologies, Inc is not permitted to use or redistribute
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* this source code without explicit permission.
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*
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*)
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unit uMainForm;
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{$I cef.inc}
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interface
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uses
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{$IFDEF DELPHI16_UP}
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Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
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Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Vcl.ExtCtrls,
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{$ELSE}
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Windows, Messages, SysUtils, Variants, Classes, Graphics,
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Controls, Forms, Dialogs, StdCtrls, ExtCtrls,
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{$ENDIF}
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uCEFChromium, uCEFWindowParent, uCEFChromiumWindow, uCEFInterfaces, uCustomResourceHandler,
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uCEFConstants, uCEFTypes, uCEFSentinel;
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type
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{ TMainForm }
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TMainForm = class(TForm)
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ChromiumWindow1: TChromiumWindow;
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AddressBarPnl: TPanel;
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Edit1: TEdit;
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Button1: TButton;
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Timer1: TTimer;
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procedure FormShow(Sender: TObject);
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procedure Button1Click(Sender: TObject);
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procedure Timer1Timer(Sender: TObject);
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procedure FormCreate(Sender: TObject);
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procedure FormCloseQuery(Sender: TObject; var CanClose: Boolean);
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procedure ChromiumWindow1Close(Sender: TObject);
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procedure ChromiumWindow1BeforeClose(Sender: TObject);
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private
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procedure WMMove(var aMessage : TWMMove); message WM_MOVE;
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procedure WMMoving(var aMessage : TMessage); message WM_MOVING;
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procedure WMEnterMenuLoop(var aMessage: TMessage); message WM_ENTERMENULOOP;
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procedure WMExitMenuLoop(var aMessage: TMessage); message WM_EXITMENULOOP;
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protected
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// Variables to control when can we destroy the form safely
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FCanClose : boolean; // Set to True in TChromium.OnBeforeClose
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FClosing : boolean; // Set to True in the CloseQuery event.
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procedure Chromium_OnAfterCreated(Sender: TObject);
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procedure Chromium_OnGetResourceHandler(Sender: TObject; const browser: ICefBrowser; const frame: ICefFrame; const request: ICefRequest; var Result: ICefResourceHandler);
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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);
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public
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{ Public declarations }
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end;
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var
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MainForm: TMainForm;
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procedure CreateGlobalCEFApp;
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implementation
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{$R *.lfm}
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uses
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uCEFMiscFunctions, uCEFApplication;
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// Destruction steps
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// =================
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// 1. The FormCloseQuery event sets CanClose to False and calls TChromiumWindow.CloseBrowser, which triggers the TChromiumWindow.OnClose event.
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// 2. The TChromiumWindow.OnClose event calls TChromiumWindow.DestroyChildWindow which triggers the TChromiumWindow.OnBeforeClose event.
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// 3. TChromiumWindow.OnBeforeClose sets FCanClose := True and sends WM_CLOSE to the form.
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procedure CreateGlobalCEFApp;
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begin
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GlobalCEFApp := TCefApplication.Create;
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//GlobalCEFApp.LogFile := 'cef.log';
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//GlobalCEFApp.LogSeverity := LOGSEVERITY_VERBOSE;
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end;
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procedure TMainForm.Button1Click(Sender: TObject);
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begin
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ChromiumWindow1.LoadURL(Edit1.Text);
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end;
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procedure TMainForm.FormCloseQuery(Sender: TObject; var CanClose: Boolean);
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begin
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CanClose := FCanClose;
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if not(FClosing) then
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begin
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FClosing := True;
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Visible := False;
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ChromiumWindow1.CloseBrowser(True);
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end;
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end;
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procedure TMainForm.FormCreate(Sender: TObject);
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begin
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FCanClose := False;
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FClosing := False;
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end;
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procedure TMainForm.FormShow(Sender: TObject);
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begin
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ChromiumWindow1.OnAfterCreated := Chromium_OnAfterCreated;
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ChromiumWindow1.ChromiumBrowser.OnGetResourceHandler := Chromium_OnGetResourceHandler;
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ChromiumWindow1.ChromiumBrowser.OnBeforePopup := Chromium_OnBeforePopup;
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// GlobalCEFApp.GlobalContextInitialized has to be TRUE before creating any browser
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// If it's not initialized yet, we use a simple timer to create the browser later.
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if not(ChromiumWindow1.CreateBrowser) then Timer1.Enabled := True;
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end;
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procedure TMainForm.Timer1Timer(Sender: TObject);
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begin
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Timer1.Enabled := False;
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if not(ChromiumWindow1.CreateBrowser) and not(ChromiumWindow1.Initialized) then
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Timer1.Enabled := True;
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end;
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procedure TMainForm.ChromiumWindow1BeforeClose(Sender: TObject);
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begin
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FCanClose := True;
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PostMessage(Handle, WM_CLOSE, 0, 0);
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end;
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procedure TMainForm.ChromiumWindow1Close(Sender: TObject);
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begin
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// DestroyChildWindow will destroy the child window created by CEF at the top of the Z order.
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if not(ChromiumWindow1.DestroyChildWindow) then
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begin
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FCanClose := True;
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PostMessage(Handle, WM_CLOSE, 0, 0);
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end;
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end;
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procedure TMainForm.Chromium_OnAfterCreated(Sender: TObject);
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begin
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ChromiumWindow1.UpdateSize;
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AddressBarPnl.Enabled := True;
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end;
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procedure TMainForm.Chromium_OnGetResourceHandler(Sender : TObject;
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const browser : ICefBrowser;
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const frame : ICefFrame;
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const request : ICefRequest;
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var Result : ICefResourceHandler);
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var
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TempStream : TStringStream;
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begin
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// This event is called from the IO thread. Use mutexes if necessary.
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TempStream := nil;
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Result := nil;
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try
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try
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TempStream := TStringStream.Create('<!DOCTYPE html><html><body><p>test</p></body></html>'{, TEncoding.UTF8, false});
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Result := TCustomResourceHandler.Create(browser, frame, '', request, TStream(TempStream), CefGetMimeType('html'));
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except
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on e : exception do
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if CustomExceptionHandler('TMainForm.Chromium_OnGetResourceHandler', e) then raise;
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end;
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finally
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if (TempStream <> nil) then FreeAndNil(TempStream);
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end;
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end;
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procedure TMainForm.Chromium_OnBeforePopup(Sender: TObject;
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const browser: ICefBrowser; const frame: ICefFrame; const targetUrl,
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targetFrameName: ustring; targetDisposition: TCefWindowOpenDisposition;
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userGesture: Boolean; const popupFeatures: TCefPopupFeatures;
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var windowInfo: TCefWindowInfo; var client: ICefClient;
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var settings: TCefBrowserSettings;
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var extra_info: ICefDictionaryValue;
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var noJavascriptAccess: Boolean;
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var Result: Boolean);
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begin
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// For simplicity, this demo blocks all popup windows and new tabs
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Result := (targetDisposition in [WOD_NEW_FOREGROUND_TAB, WOD_NEW_BACKGROUND_TAB, WOD_NEW_POPUP, WOD_NEW_WINDOW]);
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end;
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procedure TMainForm.WMMove(var aMessage : TWMMove);
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begin
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inherited;
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if (ChromiumWindow1 <> nil) then ChromiumWindow1.NotifyMoveOrResizeStarted;
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end;
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procedure TMainForm.WMMoving(var aMessage : TMessage);
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begin
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inherited;
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if (ChromiumWindow1 <> nil) then ChromiumWindow1.NotifyMoveOrResizeStarted;
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end;
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procedure TMainForm.WMEnterMenuLoop(var aMessage: TMessage);
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begin
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inherited;
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if (aMessage.wParam = 0) and (GlobalCEFApp <> nil) then GlobalCEFApp.OsmodalLoop := True;
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end;
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procedure TMainForm.WMExitMenuLoop(var aMessage: TMessage);
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begin
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inherited;
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if (aMessage.wParam = 0) and (GlobalCEFApp <> nil) then GlobalCEFApp.OsmodalLoop := False;
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end;
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end.
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