mirror of
https://github.com/salvadordf/CEF4Delphi.git
synced 2024-11-15 15:55:56 +01:00
858f1a1625
Added more code comments in the TabbedBrowser2 demo. Removed FastMM4 from the SimpleOSRBrowser demo. Modified TCEFWorkScheduler for FPC in Linux.
304 lines
11 KiB
ObjectPascal
304 lines
11 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 uCEFApplication;
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{$IFDEF FPC}
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{$MODE OBJFPC}{$H+}
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{$ENDIF}
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{$IFNDEF CPUX64}{$ALIGN ON}{$ENDIF}
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{$MINENUMSIZE 4}
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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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{$IFDEF MSWINDOWS}
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WinApi.Windows, WinApi.ActiveX,
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{$IFDEF FMX}
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FMX.Forms,
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{$ELSE}
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Vcl.Forms,
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{$ENDIF}
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{$ENDIF}
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System.Classes, System.UITypes,
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{$ELSE}
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{$IFDEF MSWINDOWS}Windows, Forms, ActiveX,{$ENDIF} Classes, Controls, {$IFDEF FPC}dynlibs,{$ENDIF}
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{$ENDIF}
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uCEFApplicationCore, uCEFTypes;
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const
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CEF_SUPPORTED_VERSION_MAJOR = uCefApplicationCore.CEF_SUPPORTED_VERSION_MAJOR;
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CEF_SUPPORTED_VERSION_MINOR = uCefApplicationCore.CEF_SUPPORTED_VERSION_MINOR;
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CEF_SUPPORTED_VERSION_RELEASE = uCefApplicationCore.CEF_SUPPORTED_VERSION_RELEASE;
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CEF_SUPPORTED_VERSION_BUILD = uCefApplicationCore.CEF_SUPPORTED_VERSION_BUILD;
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CEF_CHROMEELF_VERSION_MAJOR = uCefApplicationCore.CEF_CHROMEELF_VERSION_MAJOR;
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CEF_CHROMEELF_VERSION_MINOR = uCefApplicationCore.CEF_CHROMEELF_VERSION_MINOR;
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CEF_CHROMEELF_VERSION_RELEASE = uCefApplicationCore.CEF_CHROMEELF_VERSION_RELEASE;
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CEF_CHROMEELF_VERSION_BUILD = uCefApplicationCore.CEF_CHROMEELF_VERSION_BUILD;
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LIBCEF_DLL = uCefApplicationCore.LIBCEF_DLL;
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CHROMEELF_DLL = uCefApplicationCore.CHROMEELF_DLL;
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type
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TCefApplication = class(TCefApplicationCore)
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protected
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FDestroyApplicationObject : boolean;
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FDestroyAppWindows : boolean;
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procedure BeforeInitSubProcess; override;
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public
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constructor Create;
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destructor Destroy; override;
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procedure UpdateDeviceScaleFactor; override;
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property DestroyApplicationObject: boolean read FDestroyApplicationObject write FDestroyApplicationObject;
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property DestroyAppWindows : boolean read FDestroyAppWindows write FDestroyAppWindows;
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end;
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TCEFDirectoryDeleterThread = uCEFApplicationCore.TCEFDirectoryDeleterThread;
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var
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GlobalCEFApp : TCefApplication = nil;
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function CefCursorToWindowsCursor(aCefCursor : TCefCursorType) : TCursor;
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procedure DestroyGlobalCEFApp;
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// *********************************************************
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// ********************** ATTENTION ! **********************
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// *********************************************************
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// ** **
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// ** MANY OF THE EVENTS IN CEF4DELPHI COMPONENTS LIKE **
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// ** TCHROMIUM, TFMXCHROMIUM OR TCEFAPPLICATION ARE **
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// ** EXECUTED IN A CEF THREAD BY DEFAULT. **
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// ** **
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// ** WINDOWS CONTROLS MUST BE CREATED AND DESTROYED IN **
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// ** THE SAME THREAD TO AVOID ERRORS. **
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// ** SOME OF THEM RECREATE THE HANDLERS IF THEY ARE **
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// ** MODIFIED AND CAN CAUSE THE SAME ERRORS. **
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// ** **
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// ** DON'T CREATE, MODIFY OR DESTROY WINDOWS CONTROLS **
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// ** INSIDE THE CEF4DELPHI EVENTS AND USE **
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// ** SYNCHRONIZATION OBJECTS TO PROTECT VARIABLES AND **
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// ** FIELDS IF THEY ARE ALSO USED IN THE MAIN THREAD. **
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// ** **
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// ** READ THIS FOR MORE INFORMATION : **
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// ** https://www.briskbard.com/index.php?pageid=cef **
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// ** **
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// ** USE OUR FORUMS FOR MORE QUESTIONS : **
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// ** https://www.briskbard.com/forum/ **
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// ** **
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// *********************************************************
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// *********************************************************
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implementation
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uses
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{$IFDEF DELPHI16_UP}
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System.Math, System.IOUtils, System.SysUtils, {$IFDEF MSWINDOWS}WinApi.TlHelp32, WinApi.PSAPI,{$ENDIF}
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{$ELSE}
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Math, {$IFDEF DELPHI14_UP}IOUtils,{$ENDIF} SysUtils,
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{$IFDEF FPC}
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{$IFDEF MSWINDOWS}jwatlhelp32, jwapsapi,{$ENDIF}
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{$ELSE}
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TlHelp32, {$IFDEF MSWINDOWS}PSAPI,{$ENDIF}
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{$ENDIF}
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{$ENDIF}
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uCEFConstants, uCEFMiscFunctions;
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function CefCursorToWindowsCursor(aCefCursor : TCefCursorType) : TCursor;
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begin
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case aCefCursor of
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CT_POINTER : Result := crArrow;
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CT_CROSS : Result := crCross;
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CT_HAND : Result := crHandPoint;
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CT_IBEAM : Result := crIBeam;
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CT_WAIT : Result := crHourGlass;
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CT_HELP : Result := crHelp;
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CT_EASTRESIZE : Result := crSizeWE;
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CT_NORTHRESIZE : Result := crSizeNS;
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CT_NORTHEASTRESIZE : Result := crSizeNESW;
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CT_NORTHWESTRESIZE : Result := crSizeNWSE;
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CT_SOUTHRESIZE : Result := crSizeNS;
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CT_SOUTHEASTRESIZE : Result := crSizeNWSE;
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CT_SOUTHWESTRESIZE : Result := crSizeNESW;
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CT_WESTRESIZE : Result := crSizeWE;
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CT_NORTHSOUTHRESIZE : Result := crSizeNS;
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CT_EASTWESTRESIZE : Result := crSizeWE;
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CT_NORTHEASTSOUTHWESTRESIZE : Result := crSizeNESW;
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CT_NORTHWESTSOUTHEASTRESIZE : Result := crSizeNWSE;
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CT_COLUMNRESIZE : Result := crHSplit;
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CT_ROWRESIZE : Result := crVSplit;
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CT_MOVE : Result := crSizeAll;
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CT_PROGRESS : Result := crAppStart;
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CT_NONE : Result := crNone;
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CT_NODROP,
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CT_NOTALLOWED : Result := crNo;
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CT_GRAB,
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CT_GRABBING : Result := crDrag;
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else Result := crDefault;
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end;
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end;
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procedure DestroyGlobalCEFApp;
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begin
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if (GlobalCEFApp <> nil) then FreeAndNil(GlobalCEFApp);
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end;
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constructor TCefApplication.Create;
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begin
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inherited Create;
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if GlobalCEFApp = nil then
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GlobalCEFApp := Self;
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FDestroyApplicationObject := False;
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FDestroyAppWindows := True;
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end;
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destructor TCefApplication.Destroy;
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begin
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if GlobalCEFApp = Self then
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GlobalCEFApp := nil;
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inherited Destroy;
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end;
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procedure TCefApplication.UpdateDeviceScaleFactor;
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{$IFDEF MSWINDOWS}
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{$IFNDEF FMX}
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var
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TempHandle : HWND;
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TempDPI : UINT;
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{$ENDIF}
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{$ENDIF}
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begin
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{$IFDEF MSWINDOWS}
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{$IFNDEF FMX}
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if RunningWindows10OrNewer then
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begin
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if assigned(screen.ActiveForm) and
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screen.ActiveForm.HandleAllocated then
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TempHandle := screen.ActiveForm.Handle
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else
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if assigned(Application.MainForm) and
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Application.MainForm.HandleAllocated then
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TempHandle := Application.MainForm.Handle
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else
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TempHandle := Application.Handle;
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if GetDPIForHandle(TempHandle, TempDPI) then
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FDeviceScaleFactor := TempDPI / USER_DEFAULT_SCREEN_DPI
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else
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inherited UpdateDeviceScaleFactor;
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end
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else
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{$ENDIF}
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inherited UpdateDeviceScaleFactor;
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{$ELSE}
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inherited UpdateDeviceScaleFactor;
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{$ENDIF}
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end;
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procedure TCefApplication.BeforeInitSubProcess;
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{$IFNDEF FPC}
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{$IFNDEF FMX}
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var
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AppDestroy: procedure(Obj: TApplication; ReleaseMemoryFlag: Byte);
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{$ENDIF}
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{$ENDIF}
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begin
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{$IFNDEF FPC}
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{$IFNDEF FMX}
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if Application <> nil then
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begin
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if FDestroyApplicationObject then
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begin
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// Call the destructor in "inherited Destroy" mode. This makes it possible to undo
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// all the code that TApplication.Create did without actually releasing the Application
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// object so that TControl.Destroy and DoneApplication dont't crash.
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//
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// Undoing also includes destroying the "AppWindows" and calling OleUninitialize what
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// allows CEF to initialize the COM thread model the way it is required in the
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// sub-processes (debug assertion).
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AppDestroy := @TApplication.Destroy;
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AppDestroy(Application, 0);
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// Set all sub-objects to nil (we destroyed them already). This prevents the second
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// TApplication.Destroy call in DoneApplication from trying to release already released
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// objects.
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TApplication.InitInstance(Application);
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end
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else
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begin
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if FDestroyAppWindows then
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begin
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// This is the fix for the issue #139
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// https://github.com/salvadordf/CEF4Delphi/issues/139
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// Subprocesses will never use these window handles but TApplication creates them
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// before executing the code in the DPR file. Any other application trying to
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// initiate a DDE conversation will use SendMessage or SendMessageTimeout to
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// broadcast the WM_DDE_INITIATE to all top-level windows. The subprocesses never
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// call Application.Run so the SendMessage freezes the other applications.
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if (Application.Handle <> 0) then DestroyWindow(Application.Handle);
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{$IFDEF DELPHI9_UP}
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if (Application.PopupControlWnd <> 0) then DeallocateHWnd(Application.PopupControlWnd);
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{$ENDIF}
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end;
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if not IsLibrary then
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begin
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// Undo the OleInitialize from TApplication.Create. The sub-processes want a different
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// COM thread model and fail with an assertion if the Debug-DLLs are used.
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OleUninitialize;
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end;
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end;
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end;
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{$ELSE} // FMX
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{$IFDEF MSWINDOWS}
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// Undo the OleInitialize from FMX.Platform.Win::initialization. The sub-processes want a different
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// COM thread model and fail with an assertion if the Debug-DLLs are used.
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OleUninitialize;
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{$ENDIF MSWINDOWS}
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{$ENDIF}
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{$ENDIF}
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end;
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end.
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