mirror of
https://github.com/salvadordf/CEF4Delphi.git
synced 2024-11-16 08:15:55 +01:00
298 lines
11 KiB
ObjectPascal
298 lines
11 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 uJSEval;
|
|
|
|
{$I cef.inc}
|
|
|
|
interface
|
|
|
|
uses
|
|
{$IFDEF DELPHI16_UP}
|
|
Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics, Vcl.Menus,
|
|
Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Vcl.ExtCtrls, System.Types, Vcl.ComCtrls, Vcl.ClipBrd,
|
|
System.UITypes,
|
|
{$ELSE}
|
|
Windows, Messages, SysUtils, Variants, Classes, Graphics, Menus,
|
|
Controls, Forms, Dialogs, StdCtrls, ExtCtrls, Types, ComCtrls, ClipBrd,
|
|
{$ENDIF}
|
|
uCEFChromium, uCEFWindowParent, uCEFInterfaces, uCEFApplication, uCEFTypes, uCEFConstants;
|
|
|
|
const
|
|
MINIBROWSER_CREATED = WM_APP + $100;
|
|
MINIBROWSER_SHOWTEXTVIEWER = WM_APP + $101;
|
|
MINIBROWSER_EVALJSCODE = WM_APP + $102;
|
|
|
|
MINIBROWSER_CONTEXTMENU_EVALJSCODE = MENU_ID_USER_FIRST + 1;
|
|
|
|
EVAL_JS = 'JSContextEvalDemo';
|
|
|
|
type
|
|
TJSEvalFrm = class(TForm)
|
|
CEFWindowParent1: TCEFWindowParent;
|
|
Chromium1: TChromium;
|
|
AddressBarPnl: TPanel;
|
|
GoBtn: TButton;
|
|
AddressEdt: TEdit;
|
|
procedure Chromium1AfterCreated(Sender: TObject; const browser: ICefBrowser);
|
|
procedure GoBtnClick(Sender: TObject);
|
|
procedure FormShow(Sender: TObject);
|
|
|
|
procedure Chromium1ProcessMessageReceived(Sender: TObject;
|
|
const browser: ICefBrowser; sourceProcess: TCefProcessId;
|
|
const message: ICefProcessMessage; out Result: Boolean);
|
|
procedure Chromium1BeforeContextMenu(Sender: TObject;
|
|
const browser: ICefBrowser; const frame: ICefFrame;
|
|
const params: ICefContextMenuParams; const model: ICefMenuModel);
|
|
procedure Chromium1ContextMenuCommand(Sender: TObject;
|
|
const browser: ICefBrowser; const frame: ICefFrame;
|
|
const params: ICefContextMenuParams; commandId: Integer;
|
|
eventFlags: Cardinal; out Result: Boolean);
|
|
|
|
private
|
|
{ Private declarations }
|
|
|
|
protected
|
|
FText : string;
|
|
|
|
procedure BrowserCreatedMsg(var aMessage : TMessage); message MINIBROWSER_CREATED;
|
|
procedure ShowTextViewerMsg(var aMessage : TMessage); message MINIBROWSER_SHOWTEXTVIEWER;
|
|
procedure EvalJSCodeMsg(var aMessage : TMessage); message MINIBROWSER_EVALJSCODE;
|
|
procedure WMMove(var aMessage : TWMMove); message WM_MOVE;
|
|
procedure WMMoving(var aMessage : TMessage); message WM_MOVING;
|
|
|
|
procedure ParseEvalJsAnswer(const pMessage: ICefProcessMessage; pBrowser: ICefBrowser; pReturnValue : ICefv8Value; pException : ICefV8Exception);
|
|
|
|
public
|
|
procedure RenderProcessHandler_OnCustomMessage(const pBrowser: ICefBrowser; uSourceProcess: TCefProcessId; const pMessage: ICefProcessMessage);
|
|
end;
|
|
|
|
var
|
|
JSEvalFrm: TJSEvalFrm;
|
|
|
|
implementation
|
|
|
|
{$R *.dfm}
|
|
|
|
uses
|
|
uSimpleTextViewer, uCefProcessMessage;
|
|
|
|
// 99.9% of the code in this demo was created by xpert13 and shared in the CEF4Delphi forum.
|
|
|
|
// Steps to evaluate some JavaScript code using the V8Context
|
|
// ----------------------------------------------------------
|
|
// 1. Create a TCefCustomRenderProcessHandler in the DPR file, set a message name and the OnCustomMessage event.
|
|
// 2. Set the TCefCustomRenderProcessHandler in the GlobalCEFApp.RenderProcessHandler property.
|
|
// 3. To get the Javascript code in this demo we use a context menu that sends a MINIBROWSER_EVALJSCODE to the form.
|
|
// 4. The EvalJSCodeMsg asks for the Javascript code and sends it to the renderer using a process message.
|
|
// 5. RenderProcessHandler_OnCustomMessage receives the process message and calls ParseEvalJsAnswer to evaluate the code
|
|
// 6. ParseEvalJsAnswer evaluates the code and sends a message with the results to the browser process using a process message.
|
|
// 7. Chromium1ProcessMessageReceived receives the message, stores the results and sends a MINIBROWSER_SHOWTEXTVIEWER
|
|
// message to the form.
|
|
// 8. ShowTextViewerMsg shows the results safely using a SimpleTextViewer.
|
|
|
|
procedure TJSEvalFrm.Chromium1AfterCreated(Sender: TObject; const browser: ICefBrowser);
|
|
begin
|
|
PostMessage(Handle, MINIBROWSER_CREATED, 0, 0);
|
|
end;
|
|
|
|
procedure TJSEvalFrm.Chromium1BeforeContextMenu(Sender : TObject;
|
|
const browser : ICefBrowser;
|
|
const frame : ICefFrame;
|
|
const params : ICefContextMenuParams;
|
|
const model : ICefMenuModel);
|
|
begin
|
|
model.AddItem(MINIBROWSER_CONTEXTMENU_EVALJSCODE, 'Evaluate JavaScript code...');
|
|
end;
|
|
|
|
procedure TJSEvalFrm.Chromium1ContextMenuCommand(Sender : TObject;
|
|
const browser : ICefBrowser;
|
|
const frame : ICefFrame;
|
|
const params : ICefContextMenuParams;
|
|
commandId : Integer;
|
|
eventFlags : Cardinal;
|
|
out Result : Boolean);
|
|
begin
|
|
Result := False;
|
|
|
|
case commandId of
|
|
MINIBROWSER_CONTEXTMENU_EVALJSCODE : PostMessage(Handle, MINIBROWSER_EVALJSCODE, 0, 0);
|
|
end;
|
|
end;
|
|
|
|
procedure TJSEvalFrm.FormShow(Sender: TObject);
|
|
begin
|
|
Chromium1.CreateBrowser(CEFWindowParent1, '');
|
|
end;
|
|
|
|
procedure TJSEvalFrm.GoBtnClick(Sender: TObject);
|
|
begin
|
|
Chromium1.LoadURL(AddressEdt.Text);
|
|
end;
|
|
|
|
procedure TJSEvalFrm.BrowserCreatedMsg(var aMessage : TMessage);
|
|
begin
|
|
AddressBarPnl.Enabled := True;
|
|
GoBtn.Click;
|
|
end;
|
|
|
|
procedure TJSEvalFrm.ShowTextViewerMsg(var aMessage : TMessage);
|
|
begin
|
|
SimpleTextViewerFrm.Memo1.Lines.Text := FText;
|
|
SimpleTextViewerFrm.ShowModal;
|
|
end;
|
|
|
|
procedure TJSEvalFrm.WMMove(var aMessage : TWMMove);
|
|
begin
|
|
inherited;
|
|
|
|
if (Chromium1 <> nil) then Chromium1.NotifyMoveOrResizeStarted;
|
|
end;
|
|
|
|
procedure TJSEvalFrm.WMMoving(var aMessage : TMessage);
|
|
begin
|
|
inherited;
|
|
|
|
if (Chromium1 <> nil) then Chromium1.NotifyMoveOrResizeStarted;
|
|
end;
|
|
|
|
procedure TJSEvalFrm.EvalJSCodeMsg(var aMessage : TMessage);
|
|
var
|
|
TempMsg : ICefProcessMessage;
|
|
TempScript : string;
|
|
begin
|
|
TempScript := InputBox('JSEval demo', 'Please type some JavaScript code', 'document.title;');
|
|
|
|
if (length(TempScript) > 0) then
|
|
begin
|
|
TempMsg := TCefProcessMessageRef.New(EVAL_JS);
|
|
TempMsg.ArgumentList.SetString(0, TempScript);
|
|
Chromium1.SendProcessMessage(PID_RENDERER, TempMsg);
|
|
end;
|
|
end;
|
|
|
|
procedure TJSEvalFrm.RenderProcessHandler_OnCustomMessage(const pBrowser : ICefBrowser;
|
|
uSourceProcess : TCefProcessId;
|
|
const pMessage : ICefProcessMessage);
|
|
var
|
|
pV8Context : ICefv8Context;
|
|
pReturnValue : ICefv8Value;
|
|
pException : ICefV8Exception;
|
|
TempScript : string;
|
|
begin
|
|
if (pMessage = nil) or (pMessage.ArgumentList = nil) then exit;
|
|
|
|
if (pMessage.Name = EVAL_JS) then
|
|
begin
|
|
TempScript := pMessage.ArgumentList.GetString(0);
|
|
|
|
if (length(TempScript) > 0) then
|
|
begin
|
|
pV8Context := pBrowser.MainFrame.GetV8Context;
|
|
|
|
if pV8Context.Enter then
|
|
begin
|
|
pV8Context.Eval(TempScript, '', 1, pReturnValue, pException);
|
|
ParseEvalJsAnswer(pMessage, pBrowser, pReturnValue, pException);
|
|
pV8Context.Exit;
|
|
end;
|
|
end;
|
|
end;
|
|
end;
|
|
|
|
procedure TJSEvalFrm.ParseEvalJsAnswer(const pMessage : ICefProcessMessage;
|
|
pBrowser : ICefBrowser;
|
|
pReturnValue : ICefv8Value;
|
|
pException : ICefV8Exception);
|
|
var
|
|
pAnswer : ICefProcessMessage;
|
|
strResult : String;
|
|
bGoodDataType : Boolean;
|
|
begin
|
|
pAnswer := TCefProcessMessageRef.New(EVAL_JS);
|
|
|
|
if (pReturnValue = nil) or not(pReturnValue.IsValid) then
|
|
begin
|
|
pAnswer.ArgumentList.SetBool(0, false);
|
|
pAnswer.ArgumentList.SetString(1, pException.Message);
|
|
end
|
|
else
|
|
begin
|
|
bGoodDataType := True;
|
|
|
|
if pReturnValue.IsString then strResult := pReturnValue.GetStringValue
|
|
else if pReturnValue.IsBool then strResult := BoolToStr(pReturnValue.GetBoolValue)
|
|
else if pReturnValue.IsInt then strResult := IntToStr(pReturnValue.GetIntValue)
|
|
else if pReturnValue.IsUInt then strResult := IntToStr(pReturnValue.GetUIntValue)
|
|
else if pReturnValue.IsDouble then strResult := FloatToStr(pReturnValue.GetDoubleValue)
|
|
else bGoodDataType := False;
|
|
|
|
if bGoodDataType then
|
|
begin
|
|
pAnswer.ArgumentList.SetBool(0, true);
|
|
pAnswer.ArgumentList.SetString(1, strResult);
|
|
end
|
|
else
|
|
begin
|
|
pAnswer.ArgumentList.SetBool(0, false);
|
|
pAnswer.ArgumentList.SetString(1, 'Result data type need to be string, int, uint or double!');
|
|
end;
|
|
end;
|
|
|
|
pBrowser.SendProcessMessage(PID_BROWSER, pAnswer);
|
|
end;
|
|
|
|
procedure TJSEvalFrm.Chromium1ProcessMessageReceived(Sender : TObject;
|
|
const browser : ICefBrowser;
|
|
sourceProcess : TCefProcessId;
|
|
const message : ICefProcessMessage;
|
|
out Result : Boolean);
|
|
begin
|
|
if (message = nil) or (message.ArgumentList = nil) then exit;
|
|
|
|
if (message.Name = EVAL_JS) then
|
|
begin
|
|
FText := message.ArgumentList.GetString(1);
|
|
PostMessage(Handle, MINIBROWSER_SHOWTEXTVIEWER, 0, 0);
|
|
Result := True;
|
|
end
|
|
else
|
|
Result := False;
|
|
end;
|
|
|
|
end.
|