mirror of
https://github.com/salvadordf/CEF4Delphi.git
synced 2024-11-16 08:15:55 +01:00
91a845e42f
- Fixed issue #253 when the FMX demos in normal mode are minimized and restored by clicking directly in the task bar icon.
421 lines
12 KiB
ObjectPascal
421 lines
12 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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{$I cef.inc}
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interface
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uses
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{$IFDEF MSWINDOWS}
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Winapi.Messages, Winapi.Windows,
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{$ENDIF}
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System.SysUtils, System.Types, System.UITypes, System.Classes, System.Variants,
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FMX.Types, FMX.Controls, FMX.Forms, FMX.Graphics, FMX.Dialogs, FMX.Edit,
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FMX.Controls.Presentation, FMX.StdCtrls;
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const
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CEF_CHILDDESTROYED = WM_APP + $100;
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CEF_INITIALIZED = WM_APP + $101;
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type
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TMainForm = class(TForm)
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ButtonPnl: TPanel;
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AddressEdt: TEdit;
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OpenBtn: TButton;
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procedure FormShow(Sender: TObject);
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procedure FormCreate(Sender: TObject);
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procedure FormCloseQuery(Sender: TObject; var CanClose: Boolean);
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procedure OpenBtnClick(Sender: TObject);
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private
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// Variables to control when can we destroy the form safely
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FCanClose : boolean; // Set to True when all the child forms are closed
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FClosing : boolean; // Set to True in the CloseQuery event.
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function GetChildFormCount : integer;
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function GetChildClosing : boolean;
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procedure CreateToolboxChild(const ChildCaption, URL: string);
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procedure CloseAllChildForms;
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function PostCustomMessage(aMessage : cardinal; wParam : cardinal = 0; lParam : integer = 0) : boolean;
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protected
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{$IFDEF MSWINDOWS}
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// This is a workaround for the issue #253
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// https://github.com/salvadordf/CEF4Delphi/issues/253
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FCustomWindowState : TWindowState;
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FOldWndPrc : TFNWndProc;
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FFormStub : Pointer;
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function GetCurrentWindowState : TWindowState;
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procedure UpdateCustomWindowState;
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procedure CreateHandle; override;
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procedure DestroyHandle; override;
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procedure CustomWndProc(var aMessage: TMessage);
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{$ENDIF}
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public
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procedure DoCEFInitialized;
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procedure DoChildDestroyed;
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procedure SendChildDestroyedMsg;
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property ChildClosing : boolean read GetChildClosing;
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property ChildFormCount : integer read GetChildFormCount;
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end;
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var
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MainForm: TMainForm;
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procedure CreateGlobalCEFApp;
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implementation
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{$R *.fmx}
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uses
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FMX.Platform, FMX.Platform.Win,
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uCEFMiscFunctions, uChildForm, uCEFApplication;
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// This Firemonkey demo shows how to create child windows with browsers using CEF4Delphi.
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// It uses a custom IFMXApplicationService to handle Windows messages.
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// The application must not try to create browsers before GlobalCEFApp.GlobalContextInitialized
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// is TRUE, which is set in a different thread when the GlobalCEFApp.OnContextInitialized
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// event is triggered.
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// There are several ways to handle the race between the form creation and the
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// GlobalCEFApp.OnContextInitialized event but this demo is using a simple check
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// in the TForm.OnShow event.
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// All FMX applications using CEF4Delphi should add the $(FrameworkType) conditional define
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// in the project options to avoid duplicated resources.
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// This demo has that define in the menu option :
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// Project -> Options -> Building -> Delphi compiler -> Conditional defines (All configurations)
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// It's very important to close all the browsers before closing the main form.
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// Always follow these destruction steps in your applications to avoid
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// crashes when it's closed. Read the code comments in uChildForm.pas
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// Main form destruction steps
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// ===========================
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// 1. Destroy all child forms
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// 2. Wait until all the child forms are closed before closing the main form and terminating the application.
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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 CreateGlobalCEFApp;
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begin
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GlobalCEFApp := TCefApplication.Create;
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GlobalCEFApp.OnContextInitialized := GlobalCEFApp_OnContextInitialized;
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end;
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function TMainForm.PostCustomMessage(aMessage, wParam : cardinal; lParam : integer) : boolean;
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{$IFDEF MSWINDOWS}
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var
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TempHWND : HWND;
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{$ENDIF}
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begin
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Result := False;
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{$IFDEF MSWINDOWS}
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if (Handle <> nil) then
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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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{$ENDIF}
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end;
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{$IFDEF MSWINDOWS}
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procedure TMainForm.CreateHandle;
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begin
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inherited CreateHandle;
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FFormStub := MakeObjectInstance(CustomWndProc);
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FOldWndPrc := TFNWndProc(SetWindowLongPtr(FmxHandleToHWND(Handle), GWLP_WNDPROC, NativeInt(FFormStub)));
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end;
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procedure TMainForm.DestroyHandle;
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begin
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SetWindowLongPtr(FmxHandleToHWND(Handle), GWLP_WNDPROC, NativeInt(FOldWndPrc));
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FreeObjectInstance(FFormStub);
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inherited DestroyHandle;
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end;
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procedure TMainForm.CustomWndProc(var aMessage: TMessage);
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const
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SWP_STATECHANGED = $8000; // Undocumented
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var
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TempWindowPos : PWindowPos;
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begin
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try
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case aMessage.Msg of
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WM_ENTERMENULOOP :
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if (aMessage.wParam = 0) and
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(GlobalCEFApp <> nil) then
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GlobalCEFApp.OsmodalLoop := True;
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WM_EXITMENULOOP :
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if (aMessage.wParam = 0) and
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(GlobalCEFApp <> nil) then
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GlobalCEFApp.OsmodalLoop := False;
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WM_SIZE :
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if (aMessage.wParam = SIZE_RESTORED) then
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UpdateCustomWindowState;
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WM_WINDOWPOSCHANGING :
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begin
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TempWindowPos := TWMWindowPosChanging(aMessage).WindowPos;
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if ((TempWindowPos.Flags and SWP_STATECHANGED) = SWP_STATECHANGED) then
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UpdateCustomWindowState;
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end;
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CEF_INITIALIZED : DoCEFInitialized;
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CEF_CHILDDESTROYED : DoChildDestroyed;
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end;
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aMessage.Result := CallWindowProc(FOldWndPrc, FmxHandleToHWND(Handle), aMessage.Msg, aMessage.wParam, aMessage.lParam);
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except
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on e : exception do
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if CustomExceptionHandler('TMainForm.CustomWndProc', e) then raise;
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end;
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end;
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procedure TMainForm.UpdateCustomWindowState;
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var
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i : integer;
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TempNewState : TWindowState;
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begin
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TempNewState := GetCurrentWindowState;
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if (FCustomWindowState <> TempNewState) then
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begin
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// This is a workaround for the issue #253
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// https://github.com/salvadordf/CEF4Delphi/issues/253
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if (FCustomWindowState = TWindowState.wsMinimized) then
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begin
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i := 0;
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while (i < screen.FormCount) do
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begin
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if (screen.Forms[i] is TChildForm) then
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TChildForm(screen.Forms[i]).SendShowBrowserMsg;
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inc(i);
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end;
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end;
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FCustomWindowState := TempNewState;
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end;
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end;
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function TMainForm.GetCurrentWindowState : TWindowState;
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var
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TempPlacement : TWindowPlacement;
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TempHWND : HWND;
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begin
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// TForm.WindowState is not updated correctly in FMX forms.
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// We have to call the GetWindowPlacement function in order to read the window state correctly.
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Result := TWindowState.wsNormal;
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TempHWND := FmxHandleToHWND(Handle);
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ZeroMemory(@TempPlacement, SizeOf(TWindowPlacement));
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TempPlacement.Length := SizeOf(TWindowPlacement);
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if GetWindowPlacement(TempHWND, @TempPlacement) then
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case TempPlacement.showCmd of
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SW_SHOWMAXIMIZED : Result := TWindowState.wsMaximized;
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SW_SHOWMINIMIZED : Result := TWindowState.wsMinimized;
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end;
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end;
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{$ENDIF}
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procedure TMainForm.CreateToolboxChild(const ChildCaption, URL: string);
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var
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TempChild : TChildForm;
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begin
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if (length(URL) > 0) then
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begin
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TempChild := TChildForm.Create(self);
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TempChild.Caption := ChildCaption;
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TempChild.Homepage := URL;
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TempChild.Show;
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end;
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end;
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function TMainForm.GetChildFormCount : integer;
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var
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i : integer;
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TempComponent : TComponent;
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begin
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Result := 0;
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i := pred(ComponentCount);
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while (i >= 0) do
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begin
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TempComponent := Components[i];
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if (TempComponent <> nil) and
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(TempComponent is TChildForm) 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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function TMainForm.GetChildClosing : boolean;
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var
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i : integer;
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TempComponent : TComponent;
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begin
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Result := false;
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i := pred(ComponentCount);
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while (i >= 0) do
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begin
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TempComponent := Components[i];
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if (TempComponent <> nil) and
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(TempComponent is TChildForm) then
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begin
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if TChildForm(Components[i]).Closing then
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begin
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Result := True;
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exit;
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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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else
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dec(i);
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end;
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end;
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procedure TMainForm.OpenBtnClick(Sender: TObject);
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begin
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CreateToolboxChild('Browser', AddressEdt.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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// The main form closes all child forms first and only after that it sets CanClose to True.
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if FClosing or ChildClosing then
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CanClose := FCanClose
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else
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begin
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FClosing := True;
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if (ChildFormCount = 0) then
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CanClose := True
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else
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begin
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CanClose := False;
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ButtonPnl.Enabled := False;
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CloseAllChildForms;
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end;
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end;
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end;
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procedure TMainForm.CloseAllChildForms;
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var
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i : integer;
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TempComponent : TComponent;
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begin
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i := pred(ComponentCount);
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while (i >= 0) do
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begin
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TempComponent := Components[i];
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if (TempComponent <> nil) and
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(TempComponent is TChildForm) and
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not(TChildForm(Components[i]).Closing) then
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TChildForm(Components[i]).SendCloseMsg;
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dec(i);
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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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{$IFDEF MSWINDOWS}
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FCustomWindowState := WindowState;
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{$ENDIF}
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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 DoCEFInitialized;
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end;
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procedure TMainForm.DoCEFInitialized;
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begin
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// Enable the GUI when the global context is initialized.
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Caption := 'FMX ToolBox Browser';
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ButtonPnl.Enabled := True;
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cursor := crDefault;
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end;
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procedure TMainForm.DoChildDestroyed;
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begin
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// If there are no more child forms we can destroy the main form
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if FClosing and (ChildFormCount = 0) then
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begin
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FCanClose := True;
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PostCustomMessage(WM_CLOSE);
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end;
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end;
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procedure TMainForm.SendChildDestroyedMsg;
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begin
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PostCustomMessage(CEF_CHILDDESTROYED);
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end;
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end.
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