mirror of
https://github.com/salvadordf/CEF4Delphi.git
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431 lines
13 KiB
ObjectPascal
431 lines
13 KiB
ObjectPascal
// ************************************************************************
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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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Winapi.Windows, Winapi.Messages, System.SysUtils, System.Types, System.Actions,
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System.UITypes, System.Classes, System.Variants, FMX.Types, FMX.Controls,
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FMX.Forms, FMX.Graphics, FMX.Dialogs, FMX.TabControl, FMX.ActnList,
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System.Math, FMX.Controls.Presentation, FMX.StdCtrls, FMX.Layouts,
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uCEFFMXWorkScheduler;
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const
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CEF_INITIALIZED = WM_APP + $100;
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CEF_DESTROYTAB = WM_APP + $101;
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CEF_SHOWBROWSER = WM_APP + $102;
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HOMEPAGE_URL = 'https://www.google.com';
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DEFAULT_TAB_CAPTION = 'New tab';
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type
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TMainForm = class(TForm)
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ButtonLay: TLayout;
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AddTabBtn: TSpeedButton;
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RemoveTabBtn: TSpeedButton;
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BrowserTabCtrl: TTabControl;
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ActionList1: TActionList;
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AddTabAction: TAction;
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RemoveTabAction: TAction;
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procedure FormCreate(Sender: TObject);
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procedure FormShow(Sender: TObject);
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procedure FormResize(Sender: TObject);
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procedure FormCloseQuery(Sender: TObject; var CanClose: Boolean);
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procedure AddTabActionExecute(Sender: TObject);
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procedure RemoveTabActionExecute(Sender: TObject);
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procedure BrowserTabCtrlChange(Sender: TObject);
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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;
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FClosing : boolean;
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FLastTabID : cardinal; // Used by NextTabID to generate unique tab IDs
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{$IFDEF DELPHI17_UP}
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FMouseWheelService : IFMXMouseService;
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{$ENDIF}
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function GetNextTabID : cardinal;
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function CloseAllTabs : boolean;
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procedure CloseSelectedTab;
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property NextTabID : cardinal read GetNextTabID;
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public
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procedure InitializeUserInterface;
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procedure DestroyTab(aTabID : cardinal);
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procedure ResizeBrowser(aTabID : cardinal);
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procedure SendCaptureLostEvent;
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procedure HandleSYSCHAR(const aMessage : TMsg);
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procedure HandleSYSKEYDOWN(const aMessage : TMsg);
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procedure HandleSYSKEYUP(const aMessage : TMsg);
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function HandlePOINTER(const aMessage : TMsg) : boolean;
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function PostCustomMessage(aMessage : cardinal; wParam : cardinal = 0; lParam : integer = 0) : boolean;
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procedure NotifyMoveOrResizeStarted;
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function GetMousePosition(var aPoint : TPointF) : boolean;
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procedure SetBounds(ALeft: Integer; ATop: Integer; AWidth: Integer; AHeight: Integer); override;
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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 *.fmx}
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uses
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FMX.Platform, FMX.Platform.Win,
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uCEFMiscFunctions, uCEFApplication, uCEFConstants, uBrowserTab,
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uFMXApplicationService;
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// This demo shows how to use a TTabControl with TFrames that include
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// CEF4Delphi browsers in OSR mode and using a message pump.
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// Instead of a regular TTabItem we use a custom TBrowserTab class that
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// inherits from TTabItem and instead of a regular TFrame we use a custom
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// TBrowserFrame class that inherits from TFrame.
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// To create a new tab you need to call TBrowserTab.CreateBrowser in the last
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// step to create all the browser components and initialize the browser.
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// To close a tab you have to call TBrowserTab.CloseBrowser and wait for a
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// CEF_DESTROYTAB message that includes TBrowserTab.TabID in TMessage.wParam.
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// Then you find the tab with that unique TabID and you free it.
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// TBrowserFrame has all the usual code to close CEF4Delphi browsers following
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// a similar destruction sequence than the FMXExternalPumpBrowser demo :
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//
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// 1- TChromium.CloseBrowser(True) will trigger TChromium.OnClose and the default
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// implementation will destroy the internal browser immediately, which will
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// trigger the TChromium.OnBeforeClose event.
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// 2- TChromium.OnBeforeClose sends a CEF_DESTROYTAB message to the main form
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// to free the tab.
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// To close safely this demo you must close all the browser tabs first following
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// this steps :
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//
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// 1. FormCloseQuery sets CanClose to FALSE and calls CloseAllTabs and FClosing
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// is set to TRUE.
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// 2. Each tab will send a CEF_DESTROYTAB message to free that tab.
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// 3. When TTabControl has no tabs then we can set FCanClose to TRUE and close
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// the main form.
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procedure GlobalCEFApp_OnContextInitialized;
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begin
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if (MainForm <> nil) then MainForm.PostCustomMessage(CEF_INITIALIZED);
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end;
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procedure GlobalCEFApp_OnScheduleMessagePumpWork(const aDelayMS : int64);
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begin
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if (GlobalFMXWorkScheduler <> nil) then GlobalFMXWorkScheduler.ScheduleMessagePumpWork(aDelayMS);
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end;
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procedure CreateGlobalCEFApp;
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begin
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// TFMXWorkScheduler will call cef_do_message_loop_work when
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// it's told in the GlobalCEFApp.OnScheduleMessagePumpWork event.
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// GlobalFMXWorkScheduler needs to be created before the
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// GlobalCEFApp.StartMainProcess call.
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GlobalFMXWorkScheduler := TFMXWorkScheduler.Create(nil);
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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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GlobalCEFApp.FlashEnabled := False;
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GlobalCEFApp.ExternalMessagePump := True;
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GlobalCEFApp.MultiThreadedMessageLoop := False;
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GlobalCEFApp.cache := 'cache';
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GlobalCEFApp.OnScheduleMessagePumpWork := GlobalCEFApp_OnScheduleMessagePumpWork;
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GlobalCEFApp.OnContextInitialized := GlobalCEFApp_OnContextInitialized;
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end;
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procedure TMainForm.NotifyMoveOrResizeStarted;
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var
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i : integer;
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begin
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if (BrowserTabCtrl = nil) then exit;
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i := pred(BrowserTabCtrl.TabCount);
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while (i >= 0) do
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begin
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TBrowserTab(BrowserTabCtrl.Tabs[i]).NotifyMoveOrResizeStarted;
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dec(i);
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end;
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end;
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function TMainForm.GetMousePosition(var aPoint : TPointF) : boolean;
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begin
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{$IFDEF DELPHI17_UP}
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if (FMouseWheelService <> nil) then
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begin
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aPoint := FMouseWheelService.GetMousePos;
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Result := True;
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end
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else
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begin
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aPoint.x := 0;
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aPoint.y := 0;
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Result := False;
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end;
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{$ELSE}
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TempPointF := Platform.GetMousePos;
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Result := True;
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{$ENDIF}
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end;
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procedure TMainForm.SetBounds(ALeft, ATop, AWidth, AHeight: Integer);
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var
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PositionChanged: Boolean;
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begin
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PositionChanged := (ALeft <> Left) or (ATop <> Top);
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inherited SetBounds(ALeft, ATop, AWidth, AHeight);
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if PositionChanged then
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NotifyMoveOrResizeStarted;
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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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ButtonLay.Enabled := False;
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if not(CloseAllTabs) then CanClose := 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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TFMXApplicationService.AddPlatformService;
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FCanClose := False;
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FClosing := False;
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FLastTabID := 0;
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{$IFDEF DELPHI17_UP}
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if TPlatformServices.Current.SupportsPlatformService(IFMXMouseService) then
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FMouseWheelService := TPlatformServices.Current.GetPlatformService(IFMXMouseService) as IFMXMouseService;
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{$ENDIF}
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end;
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procedure TMainForm.FormResize(Sender: TObject);
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var
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i : integer;
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begin
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i := pred(BrowserTabCtrl.TabCount);
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while (i >= 0) do
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begin
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TBrowserTab(BrowserTabCtrl.Tabs[i]).ResizeBrowser;
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dec(i);
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end;
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end;
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procedure TMainForm.FormShow(Sender: TObject);
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begin
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if (GlobalCEFApp <> nil) and GlobalCEFApp.GlobalContextInitialized then
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InitializeUserInterface;
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end;
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procedure TMainForm.InitializeUserInterface;
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begin
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if not(ButtonLay.Enabled) then
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begin
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ButtonLay.Enabled := True;
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Caption := 'FMX Tabbed OSR Browser';
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cursor := crDefault;
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if (BrowserTabCtrl.TabCount <= 0) then AddTabAction.Execute;
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end;
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end;
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function TMainForm.GetNextTabID : cardinal;
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begin
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inc(FLastTabID);
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Result := FLastTabID;
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end;
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procedure TMainForm.AddTabActionExecute(Sender: TObject);
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var
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TempNewTab : TBrowserTab;
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begin
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TempNewTab := TBrowserTab.Create(BrowserTabCtrl, NextTabID, DEFAULT_TAB_CAPTION);
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TempNewTab.Parent := BrowserTabCtrl;
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BrowserTabCtrl.TabIndex := pred(BrowserTabCtrl.TabCount);
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TempNewTab.CreateBrowser(HOMEPAGE_URL);
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end;
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procedure TMainForm.RemoveTabActionExecute(Sender: TObject);
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begin
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CloseSelectedTab;
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end;
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procedure TMainForm.DestroyTab(aTabID : cardinal);
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var
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i : integer;
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TempText : string;
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begin
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i := pred(BrowserTabCtrl.TabCount);
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while (i >= 0) do
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if (TBrowserTab(BrowserTabCtrl.Tabs[i]).TabID = aTabID) then
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begin
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BrowserTabCtrl.Delete(i);
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break;
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end
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else
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dec(i);
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if FClosing then
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begin
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if (BrowserTabCtrl.TabCount <= 0) then
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begin
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FCanClose := True;
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Close;
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end;
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end
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else
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begin
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// Sometimes TTabControl doesn't draw the new selected tab correctly.
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// Changing TTabItem.Text forces the component to redraw all the tabs.
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// A nicer solution would be to use a custom ttabcontrol that publishes
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// the TTabControl.RealignTabs procedure.
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if (BrowserTabCtrl.ActiveTab <> nil) then
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begin
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TempText := BrowserTabCtrl.ActiveTab.Text;
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BrowserTabCtrl.ActiveTab.Text := TempText + ' ';
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BrowserTabCtrl.ActiveTab.Text := TempText;
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end;
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end;
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end;
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function TMainForm.PostCustomMessage(aMessage, wParam : cardinal; lParam : integer) : boolean;
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var
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TempHWND : HWND;
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begin
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TempHWND := FmxHandleToHWND(Handle);
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Result := (TempHWND <> 0) and WinApi.Windows.PostMessage(TempHWND, aMessage, wParam, lParam);
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end;
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procedure TMainForm.BrowserTabCtrlChange(Sender: TObject);
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begin
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if (BrowserTabCtrl.ActiveTab <> nil) then
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TBrowserTab(BrowserTabCtrl.ActiveTab).FocusBrowser;
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end;
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function TMainForm.CloseAllTabs : boolean;
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var
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i : integer;
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begin
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Result := False;
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i := pred(BrowserTabCtrl.TabCount);
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while (i >= 0) do
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begin
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TBrowserTab(BrowserTabCtrl.Tabs[i]).CloseBrowser;
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Result := True;
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dec(i);
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end;
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end;
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procedure TMainForm.ResizeBrowser(aTabID : cardinal);
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var
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i : integer;
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begin
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i := pred(BrowserTabCtrl.TabCount);
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while (i >= 0) do
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if (TBrowserTab(BrowserTabCtrl.Tabs[i]).TabID = aTabID) then
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begin
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TBrowserTab(BrowserTabCtrl.Tabs[i]).ResizeBrowser;
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break;
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end
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else
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dec(i);
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end;
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procedure TMainForm.CloseSelectedTab;
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begin
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if (BrowserTabCtrl.ActiveTab <> nil) then
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TBrowserTab(BrowserTabCtrl.ActiveTab).CloseBrowser;
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end;
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procedure TMainForm.SendCaptureLostEvent;
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begin
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if (BrowserTabCtrl.ActiveTab <> nil) then
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TBrowserTab(BrowserTabCtrl.ActiveTab).SendCaptureLostEvent;
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end;
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procedure TMainForm.HandleSYSCHAR(const aMessage : TMsg);
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begin
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if (BrowserTabCtrl.ActiveTab <> nil) then
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TBrowserTab(BrowserTabCtrl.ActiveTab).HandleSYSCHAR(aMessage);
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end;
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procedure TMainForm.HandleSYSKEYDOWN(const aMessage : TMsg);
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begin
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if (BrowserTabCtrl.ActiveTab <> nil) then
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TBrowserTab(BrowserTabCtrl.ActiveTab).HandleSYSKEYDOWN(aMessage);
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end;
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procedure TMainForm.HandleSYSKEYUP(const aMessage : TMsg);
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begin
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if (BrowserTabCtrl.ActiveTab <> nil) then
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TBrowserTab(BrowserTabCtrl.ActiveTab).HandleSYSKEYUP(aMessage);
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end;
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function TMainForm.HandlePOINTER(const aMessage : TMsg) : boolean;
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begin
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Result := (BrowserTabCtrl.ActiveTab <> nil) and
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TBrowserTab(BrowserTabCtrl.ActiveTab).HandlePOINTER(aMessage);
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end;
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end.
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