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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
383
demos/Lazarus_Windows/PopupBrowser/uMainForm.pas
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383
demos/Lazarus_Windows/PopupBrowser/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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Windows, Messages, SysUtils, Variants, Classes, Graphics,
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Controls, Forms, Dialogs, StdCtrls, ExtCtrls, SyncObjs,
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uCEFChromium, uCEFWindowParent, uCEFInterfaces, uCEFConstants, uCEFTypes, uChildForm,
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uCEFWinControl, uCEFChromiumEvents, uCEFSentinel;
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const
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CEF_CREATENEXTCHILD = WM_APP + $A50;
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CEF_CHILDDESTROYED = WM_APP + $A51;
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type
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{ TMainForm }
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TMainForm = class(TForm)
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AddressPnl: TPanel;
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AddressEdt: TEdit;
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ApplicationProperties1: TApplicationProperties;
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GoBtn: TButton;
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Timer1: TTimer;
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Chromium1: TChromium;
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CEFWindowParent1: TCEFWindowParent;
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procedure CEFSentinel1Close(Sender: TObject);
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procedure GoBtnClick(Sender: TObject);
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procedure Timer1Timer(Sender: TObject);
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procedure FormShow(Sender: TObject);
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procedure FormCreate(Sender: TObject);
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procedure FormDestroy(Sender: TObject);
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procedure FormCloseQuery(Sender: TObject; var CanClose: Boolean);
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procedure Chromium1AfterCreated(Sender: TObject; const browser: ICefBrowser);
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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);
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procedure Chromium1BeforeClose(Sender: TObject; const browser: ICefBrowser);
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procedure Chromium1Close(Sender: TObject; const browser: ICefBrowser; var aAction: TCefCloseBrowserAction);
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protected
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FChildForm : TChildForm;
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FCriticalSection : TCriticalSection;
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FCanClose : boolean; // Set to True in TChromium.OnBeforeClose
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FClosingMainForm : boolean; // Set to True in the CloseQuery event.
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FClosingChildren : boolean; // Set to True in the CloseQuery event.
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function GetPopupChildCount : integer;
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procedure ClosePopupChildren;
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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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procedure BrowserCreatedMsg(var aMessage : TMessage); message CEF_AFTERCREATED;
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procedure BrowserDestroyMsg(var aMessage : TMessage); message CEF_DESTROY;
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procedure CreateNextChildMsg(var aMessage : TMessage); message CEF_CREATENEXTCHILD;
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procedure ChildDestroyedMsg(var aMessage : TMessage); message CEF_CHILDDESTROYED;
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public
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function CreateClientHandler(var windowInfo : TCefWindowInfo; var client : ICefClient; const targetFrameName : string; const popupFeatures : TCefPopupFeatures) : boolean;
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property PopupChildCount : integer read GetPopupChildCount;
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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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uCEFApplication, uCEFMiscFunctions;
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// This is demo shows how to create popup windows in CEF.
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// You need to understand The SimpleBrowser2 and SimpleOSRBrowser demos completely before trying to understand this demo.
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// When TChromium needs to show a new popup window it executes TChromium.OnBeforePopup.
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// VCL components *MUST* be created and destroyed in the main thread but CEF executes the
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// TChromium.OnBeforePopup in a different thread.
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// For this reason this demo creates a hidden popup form (TChildForm) in case CEF needs to show a popup window.
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// TChromium.OnBeforePopup calls TChildForm.CreateClientHandler to initialize some parameters and create the new ICefClient.
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// After that, it sends a CEF_CREATENEXTCHILD message to show the popup form and create a new one.
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// All the child forms must be correctly destroyed before closing the main form. Read the code comments in uChildForm.pas
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// to know how the popup windows are destroyed.
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// The main form sends a WM_CLOSE to all active popup forms and waits until all of them have sent a CEF_CHILDDESTROYED message.
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// Destruction steps
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// =================
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// 1. FormCloseQuery sets CanClose to FALSE and it closes all child forms.
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// 2. When all the child forms are closed then FormCloseQuery is triggered again, sets CanClose to FALSE calls TChromium.CloseBrowser which triggers the TChromium.OnClose event.
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// 3. TChromium.OnClose sends a CEFBROWSER_DESTROY message to destroy CEFWindowParent1 in the main thread, which triggers the TChromium.OnBeforeClose event.
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// 4. TChromium.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.WindowlessRenderingEnabled := True;
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GlobalCEFApp.EnableHighDPISupport := True;
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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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FClosingChildren := True;
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Visible := False;
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if (PopupChildCount > 0) then
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begin
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ClosePopupChildren;
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CanClose := False;
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end
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else
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begin
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CanClose := FCanClose;
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if not(FClosingMainForm) then
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begin
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FClosingMainForm := True;
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Visible := False;
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Chromium1.CloseBrowser(True);
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end;
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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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FClosingChildren := False;
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FClosingMainForm := False;
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FCanClose := False;
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FCriticalSection := TCriticalSection.Create;
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Chromium1.DefaultURL := AddressEdt.Text;
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Chromium1.Options.BackgroundColor := CefColorSetARGB($FF, $FF, $FF, $FF);
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end;
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procedure TMainForm.FormDestroy(Sender: TObject);
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begin
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FreeAndNil(FCriticalSection);
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end;
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procedure TMainForm.FormShow(Sender: TObject);
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begin
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// You *MUST* call CreateBrowser to create and initialize the browser.
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// This will trigger the AfterCreated event when the browser is fully
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// initialized and ready to receive commands.
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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(Chromium1.CreateBrowser(CEFWindowParent1)) then Timer1.Enabled := True;
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end;
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procedure TMainForm.Chromium1AfterCreated(Sender: TObject; const browser: ICefBrowser);
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begin
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// Now the browser is fully initialized we can send a message to the main form to load the initial web page.
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PostMessage(Handle, CEF_AFTERCREATED, 0, 0);
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end;
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procedure TMainForm.Chromium1BeforePopup(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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case targetDisposition of
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WOD_NEW_FOREGROUND_TAB,
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WOD_NEW_BACKGROUND_TAB,
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WOD_NEW_WINDOW : Result := True; // For simplicity, this demo blocks new tabs and new windows.
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WOD_NEW_POPUP : Result := not(CreateClientHandler(windowInfo, client, targetFrameName, popupFeatures));
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else Result := False;
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end;
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end;
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function TMainForm.CreateClientHandler(var windowInfo : TCefWindowInfo;
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var client : ICefClient;
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const targetFrameName : string;
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const popupFeatures : TCefPopupFeatures) : boolean;
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begin
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try
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FCriticalSection.Acquire;
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Result := (FChildForm <> nil) and
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FChildForm.CreateClientHandler(windowInfo, client, targetFrameName, popupFeatures) and
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PostMessage(Handle, CEF_CREATENEXTCHILD, 0, 0);
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finally
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FCriticalSection.Release;
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end;
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end;
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function TMainForm.GetPopupChildCount : integer;
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var
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i : integer;
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TempForm : TCustomForm;
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begin
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Result := 0;
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i := pred(screen.CustomFormCount);
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while (i >= 0) do
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begin
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TempForm := screen.CustomForms[i];
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// Only count the fully initialized child forms and not the one waiting to be used.
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if (TempForm is TChildForm) and
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TChildForm(TempForm).ClientInitialized then
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inc(Result);
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dec(i);
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end;
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end;
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procedure TMainForm.ClosePopupChildren;
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var
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i : integer;
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TempForm : TCustomForm;
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begin
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i := pred(screen.CustomFormCount);
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while (i >= 0) do
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begin
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TempForm := screen.CustomForms[i];
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// Only send WM_CLOSE to fully initialized child forms.
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if (TempForm is TChildForm) and
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TChildForm(TempForm).ClientInitialized and
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not(TChildForm(TempForm).Closing) then
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PostMessage(TChildForm(TempForm).Handle, WM_CLOSE, 0, 0);
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dec(i);
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end;
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end;
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procedure TMainForm.BrowserCreatedMsg(var aMessage : TMessage);
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begin
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FChildForm := TChildForm.Create(self);
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Caption := 'Popup Browser';
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AddressPnl.Enabled := True;
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end;
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procedure TMainForm.BrowserDestroyMsg(var aMessage : TMessage);
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begin
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CEFWindowParent1.Free;
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end;
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procedure TMainForm.CreateNextChildMsg(var aMessage : TMessage);
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begin
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try
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FCriticalSection.Acquire;
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if (FChildForm <> nil) then
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begin
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//FChildForm.ApplyPopupFeatures;
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//FChildForm.Show;
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PostMessage(FChildForm.Handle, CEF_SHOWCHILD, 0, 0);
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end;
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FChildForm := TChildForm.Create(self);
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finally
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FCriticalSection.Release;
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end;
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end;
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procedure TMainForm.ChildDestroyedMsg(var aMessage : TMessage);
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begin
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if FClosingChildren and (PopupChildCount = 0) then Close;
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end;
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procedure TMainForm.GoBtnClick(Sender: TObject);
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begin
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// This will load the URL in the edit box
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Chromium1.LoadURL(AddressEdt.Text);
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end;
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procedure TMainForm.CEFSentinel1Close(Sender: TObject);
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begin
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end;
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procedure TMainForm.Chromium1BeforeClose(Sender: TObject; const browser: ICefBrowser);
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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.Chromium1Close(Sender: TObject; const browser: ICefBrowser; var aAction: TCefCloseBrowserAction);
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begin
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PostMessage(Handle, CEF_DESTROY, 0, 0);
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aAction := cbaDelay;
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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(Chromium1.CreateBrowser(CEFWindowParent1)) and not(Chromium1.Initialized) then
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Timer1.Enabled := True;
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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 (Chromium1 <> nil) then Chromium1.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 (Chromium1 <> nil) then Chromium1.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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