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CEF4Delphi/source/uCEFDownloadImageCallBack.pas

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// ************************************************************************
// ***************************** CEF4Delphi *******************************
// ************************************************************************
//
// CEF4Delphi is based on DCEF3 which uses CEF to embed a chromium-based
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// 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 � 2019 Salvador Diaz Fau. All rights reserved.
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//
// ************************************************************************
// ************ 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 uCEFDownloadImageCallBack;
{$IFDEF FPC}
{$MODE OBJFPC}{$H+}
{$ENDIF}
{$IFNDEF CPUX64}{$ALIGN ON}{$ENDIF}
{$MINENUMSIZE 4}
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{$I cef.inc}
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interface
uses
uCEFBaseRefCounted, uCEFInterfaces, uCEFTypes;
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type
TCefDownloadImageCallbackOwn = class(TCefBaseRefCountedOwn, ICefDownloadImageCallback)
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protected
procedure OnDownloadImageFinished(const imageUrl: ustring; httpStatusCode: Integer; const image: ICefImage); virtual; abstract;
public
constructor Create; virtual;
end;
TCefFastDownloadImageCallback = class(TCefDownloadImageCallbackOwn)
protected
FProc: TOnDownloadImageFinishedProc;
procedure OnDownloadImageFinished(const imageUrl: ustring; httpStatusCode: Integer; const image: ICefImage); override;
public
constructor Create(const proc: TOnDownloadImageFinishedProc); reintroduce;
end;
TCefCustomDownloadImageCallback = class(TCefDownloadImageCallbackOwn)
protected
FEvents : Pointer;
procedure OnDownloadImageFinished(const imageUrl: ustring; httpStatusCode: Integer; const image: ICefImage); override;
public
constructor Create(const aEvents : IChromiumEvents); reintroduce;
destructor Destroy; override;
end;
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implementation
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uses
{$IFDEF DELPHI16_UP}
System.SysUtils,
{$ELSE}
SysUtils,
{$ENDIF}
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uCEFMiscFunctions, uCEFLibFunctions, uCEFImage;
// TCefDownloadImageCallbackOwn
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procedure cef_download_image_callback_on_download_image_finished( self : PCefDownloadImageCallback;
const image_url : PCefString;
http_status_code : Integer;
image : PCefImage); stdcall;
var
TempObject : TObject;
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begin
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TempObject := CefGetObject(self);
if (TempObject <> nil) and (TempObject is TCefDownloadImageCallbackOwn) then
TCefDownloadImageCallbackOwn(TempObject).OnDownloadImageFinished(CefString(image_url),
http_status_code,
TCefImageRef.UnWrap(image));
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end;
constructor TCefDownloadImageCallbackOwn.Create;
begin
inherited CreateData(SizeOf(TCefDownloadImageCallback));
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with PCefDownloadImageCallback(FData)^ do
on_download_image_finished := {$IFDEF FPC}@{$ENDIF}cef_download_image_callback_on_download_image_finished;
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end;
// TCefFastDownloadImageCallback
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constructor TCefFastDownloadImageCallback.Create(const proc: TOnDownloadImageFinishedProc);
begin
inherited Create;
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FProc := proc;
end;
procedure TCefFastDownloadImageCallback.OnDownloadImageFinished(const imageUrl: ustring; httpStatusCode: Integer; const image: ICefImage);
begin
FProc(imageUrl, httpStatusCode, image);
end;
// TCefCustomDownloadImageCallback
constructor TCefCustomDownloadImageCallback.Create(const aEvents : IChromiumEvents);
begin
inherited Create;
FEvents := Pointer(aEvents);
end;
destructor TCefCustomDownloadImageCallback.Destroy;
begin
FEvents := nil;
inherited Destroy;
end;
procedure TCefCustomDownloadImageCallback.OnDownloadImageFinished(const imageUrl : ustring;
httpStatusCode : Integer;
const image : ICefImage);
begin
try
try
if (FEvents <> nil) then IChromiumEvents(FEvents).doDownloadImageFinished(imageUrl, httpStatusCode, image);
except
on e : exception do
if CustomExceptionHandler('TCefCustomDownloadImageCallback.OnDownloadImageFinished', e) then raise;
end;
finally
FEvents := nil;
end;
end;
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end.