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CEF4Delphi/demos/MDIBrowser/uMainForm.pas
Salvador Díaz Fau 43cb86a823 Added the possibility to use independent request contexts when creating browsers
- Modified MDIBrowser demo to test the child browsers with independent request contexts.
2017-09-29 18:42:12 +02:00

193 lines
4.9 KiB
ObjectPascal

// ************************************************************************
// ***************************** CEF4Delphi *******************************
// ************************************************************************
//
// CEF4Delphi is based on DCEF3 which uses CEF3 to embed a chromium-based
// browser in Delphi applications.
//
// The original license of DCEF3 still applies to CEF4Delphi.
//
// For more information about CEF4Delphi visit :
// https://www.briskbard.com/index.php?lang=en&pageid=cef
//
// Copyright © 2017 Salvador Díaz Fau. All rights reserved.
//
// ************************************************************************
// ************ vvvv Original license and comments below vvvv *************
// ************************************************************************
(*
* Delphi Chromium Embedded 3
*
* Usage allowed under the restrictions of the Lesser GNU General Public License
* or alternatively the restrictions of the Mozilla Public License 1.1
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for
* the specific language governing rights and limitations under the License.
*
* Unit owner : Henri Gourvest <hgourvest@gmail.com>
* Web site : http://www.progdigy.com
* Repository : http://code.google.com/p/delphichromiumembedded/
* Group : http://groups.google.com/group/delphichromiumembedded
*
* Embarcadero Technologies, Inc is not permitted to use or redistribute
* this source code without explicit permission.
*
*)
unit uMainForm;
{$I cef.inc}
interface
uses
{$IFDEF DELPHI16_UP}
Winapi.Windows, System.SysUtils, System.Classes, Vcl.Graphics, Vcl.Forms,
Vcl.Controls, Vcl.StdCtrls, Vcl.Dialogs, Vcl.Buttons, Winapi.Messages,
Vcl.ExtCtrls, Vcl.ComCtrls;
{$ELSE}
Windows, SysUtils, Classes, Graphics, Forms,
Controls, StdCtrls, Dialogs, Buttons, Messages,
ExtCtrls, ComCtrls;
{$ENDIF}
const
CEFBROWSER_CREATED = WM_APP + $100;
CEFBROWSER_CHILDDESTROYED = WM_APP + $101;
CEFBROWSER_DESTROY = WM_APP + $102;
type
TMainForm = class(TForm)
ButtonPnl: TPanel;
NewBtn: TSpeedButton;
ExitBtn: TSpeedButton;
NewContextChk: TCheckBox;
procedure FormCreate(Sender: TObject);
procedure NewBtnClick(Sender: TObject);
procedure ExitBtnClick(Sender: TObject);
private
// Variables to control when can we destroy the form safely
FCanClose : boolean; // Set to True when all the child forms are closed
FClosing : boolean; // Set to True in the CloseQuery event.
procedure CreateMDIChild(const Name: string);
procedure CloseAllChildForms;
function GetChildClosing : boolean;
protected
procedure ChildDestroyedMsg(var aMessage : TMessage); message CEFBROWSER_CHILDDESTROYED;
public
function CloseQuery: Boolean; override;
property ChildClosing : boolean read GetChildClosing;
end;
var
MainForm: TMainForm;
implementation
{$R *.dfm}
uses
uChildForm;
// Destruction steps
// =================
// 1. Destroy all child forms
// 2. Wait until all the child forms are closed before closing the main form and terminating the application.
procedure TMainForm.CreateMDIChild(const Name: string);
var
TempChild : TChildForm;
begin
TempChild := TChildForm.Create(Application);
TempChild.Caption := Name;
end;
procedure TMainForm.CloseAllChildForms;
var
i : integer;
begin
i := pred(MDIChildCount);
while (i >= 0) do
begin
if not(TChildForm(MDIChildren[i]).Closing) then
PostMessage(MDIChildren[i].Handle, WM_CLOSE, 0, 0);
dec(i);
end;
end;
function TMainForm.GetChildClosing : boolean;
var
i : integer;
begin
Result := false;
i := pred(MDIChildCount);
while (i >= 0) do
if TChildForm(MDIChildren[i]).Closing then
begin
Result := True;
exit;
end
else
dec(i);
end;
procedure TMainForm.FormCreate(Sender: TObject);
begin
FCanClose := False;
FClosing := False;
end;
procedure TMainForm.NewBtnClick(Sender: TObject);
begin
CreateMDIChild('ChildForm' + IntToStr(MDIChildCount + 1));
end;
procedure TMainForm.ExitBtnClick(Sender: TObject);
begin
ButtonPnl.Enabled := False;
if (MDIChildCount = 0) then
Close
else
CloseAllChildForms;
end;
procedure TMainForm.ChildDestroyedMsg(var aMessage : TMessage);
begin
// If there are no more child forms we can destroy the main form
if (MDIChildCount = 0) then
begin
ButtonPnl.Enabled := False;
FCanClose := True;
PostMessage(Handle, WM_CLOSE, 0, 0);
end;
end;
function TMainForm.CloseQuery: Boolean;
begin
if FClosing or ChildClosing then
Result := FCanClose
else
begin
FClosing := True;
if (MDIChildCount = 0) then
Result := True
else
begin
Result := False;
CloseAllChildForms;
end;
end;
end;
end.