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https://github.com/salvadordf/CEF4Delphi.git
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43cb86a823
- Modified MDIBrowser demo to test the child browsers with independent request contexts.
193 lines
4.9 KiB
ObjectPascal
193 lines
4.9 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 CEF3 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 © 2017 Salvador Díaz Fau. All rights reserved.
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//
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// ************************************************************************
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// ************ vvvv Original license and comments below vvvv *************
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// ************************************************************************
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(*
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* Delphi Chromium Embedded 3
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*
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* Usage allowed under the restrictions of the Lesser GNU General Public License
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* or alternatively the restrictions of the Mozilla Public License 1.1
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for
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* the specific language governing rights and limitations under the License.
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*
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* Unit owner : Henri Gourvest <hgourvest@gmail.com>
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* Web site : http://www.progdigy.com
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* Repository : http://code.google.com/p/delphichromiumembedded/
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* Group : http://groups.google.com/group/delphichromiumembedded
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*
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* Embarcadero Technologies, Inc is not permitted to use or redistribute
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* this source code without explicit permission.
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*
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*)
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unit uMainForm;
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{$I cef.inc}
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interface
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uses
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{$IFDEF DELPHI16_UP}
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Winapi.Windows, System.SysUtils, System.Classes, Vcl.Graphics, Vcl.Forms,
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Vcl.Controls, Vcl.StdCtrls, Vcl.Dialogs, Vcl.Buttons, Winapi.Messages,
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Vcl.ExtCtrls, Vcl.ComCtrls;
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{$ELSE}
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Windows, SysUtils, Classes, Graphics, Forms,
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Controls, StdCtrls, Dialogs, Buttons, Messages,
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ExtCtrls, ComCtrls;
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{$ENDIF}
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const
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CEFBROWSER_CREATED = WM_APP + $100;
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CEFBROWSER_CHILDDESTROYED = WM_APP + $101;
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CEFBROWSER_DESTROY = WM_APP + $102;
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type
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TMainForm = class(TForm)
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ButtonPnl: TPanel;
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NewBtn: TSpeedButton;
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ExitBtn: TSpeedButton;
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NewContextChk: TCheckBox;
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procedure FormCreate(Sender: TObject);
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procedure NewBtnClick(Sender: TObject);
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procedure ExitBtnClick(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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procedure CreateMDIChild(const Name: string);
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procedure CloseAllChildForms;
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function GetChildClosing : boolean;
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protected
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procedure ChildDestroyedMsg(var aMessage : TMessage); message CEFBROWSER_CHILDDESTROYED;
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public
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function CloseQuery: Boolean; override;
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property ChildClosing : boolean read GetChildClosing;
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end;
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var
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MainForm: TMainForm;
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implementation
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{$R *.dfm}
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uses
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uChildForm;
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// 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 TMainForm.CreateMDIChild(const Name: string);
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var
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TempChild : TChildForm;
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begin
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TempChild := TChildForm.Create(Application);
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TempChild.Caption := Name;
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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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begin
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i := pred(MDIChildCount);
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while (i >= 0) do
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begin
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if not(TChildForm(MDIChildren[i]).Closing) then
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PostMessage(MDIChildren[i].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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function TMainForm.GetChildClosing : 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(MDIChildCount);
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while (i >= 0) do
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if TChildForm(MDIChildren[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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procedure TMainForm.FormCreate(Sender: TObject);
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begin
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FCanClose := False;
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FClosing := False;
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end;
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procedure TMainForm.NewBtnClick(Sender: TObject);
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begin
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CreateMDIChild('ChildForm' + IntToStr(MDIChildCount + 1));
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end;
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procedure TMainForm.ExitBtnClick(Sender: TObject);
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begin
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ButtonPnl.Enabled := False;
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if (MDIChildCount = 0) then
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Close
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else
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CloseAllChildForms;
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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 there are no more child forms we can destroy the main form
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if (MDIChildCount = 0) then
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begin
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ButtonPnl.Enabled := False;
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FCanClose := True;
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PostMessage(Handle, WM_CLOSE, 0, 0);
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end;
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end;
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function TMainForm.CloseQuery: Boolean;
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begin
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if FClosing or ChildClosing then
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Result := FCanClose
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else
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begin
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FClosing := True;
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if (MDIChildCount = 0) then
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Result := True
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else
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begin
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Result := 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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end.
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