CEF4Delphi/source/uCEFScrollView.pas

// ************************************************************************
// ***************************** CEF4Delphi *******************************
// ************************************************************************
//
// CEF4Delphi is based on DCEF3 which uses CEF 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 <20> 2021 Salvador Diaz 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 uCEFScrollView;

{$IFDEF FPC}
  {$MODE OBJFPC}{$H+}
{$ENDIF}

{$IFNDEF CPUX64}{$ALIGN ON}{$ENDIF}
{$MINENUMSIZE 4}

{$I cef.inc}

interface

uses
  {$IFDEF DELPHI16_UP}
  System.Classes, System.SysUtils,
  {$ELSE}
  Classes, SysUtils,
  {$ENDIF}
  uCEFBaseRefCounted, uCEFInterfaces, uCEFTypes, uCEFView;

type
  TCefScrollViewRef = class(TCefViewRef, ICefScrollView)
    protected
      procedure SetContentView(const view: ICefView);
      function  GetContentView : ICefView;
      function  GetVisibleContentRect : TCefRect;
      function  HasHorizontalScrollbar : boolean;
      function  GetHorizontalScrollbarHeight : Integer;
      function  HasVerticalScrollbar : boolean;
      function  GetVerticalScrollbarWidth : Integer;

    public
      class function UnWrap(data: Pointer): ICefScrollView;
      class function CreateScrollView(const delegate: ICefViewDelegate): ICefScrollView;
  end;

implementation

uses
  uCEFLibFunctions, uCEFMiscFunctions;

procedure TCefScrollViewRef.SetContentView(const view: ICefView);
begin
  PCefScrollView(FData)^.set_content_view(PCefScrollView(FData),
                                          CefGetData(view));
end;

function TCefScrollViewRef.GetContentView : ICefView;
begin
  Result := TCefViewRef.UnWrap(PCefScrollView(FData)^.get_content_view(PCefScrollView(FData)));
end;

function TCefScrollViewRef.GetVisibleContentRect : TCefRect;
begin
  Result := PCefScrollView(FData)^.get_visible_content_rect(PCefScrollView(FData));
end;

function TCefScrollViewRef.HasHorizontalScrollbar : boolean;
begin
  Result := (PCefScrollView(FData)^.has_horizontal_scrollbar(PCefScrollView(FData)) <> 0);
end;

function TCefScrollViewRef.GetHorizontalScrollbarHeight : Integer;
begin
  Result := PCefScrollView(FData)^.get_horizontal_scrollbar_height(PCefScrollView(FData));
end;

function TCefScrollViewRef.HasVerticalScrollbar : boolean;
begin
  Result := (PCefScrollView(FData)^.has_vertical_scrollbar(PCefScrollView(FData)) <> 0);
end;

function TCefScrollViewRef.GetVerticalScrollbarWidth : Integer;
begin
  Result := PCefScrollView(FData)^.get_vertical_scrollbar_width(PCefScrollView(FData));
end;

class function TCefScrollViewRef.UnWrap(data: Pointer): ICefScrollView;
begin
  if (data <> nil) then
    Result := Create(data) as ICefScrollView
   else
    Result := nil;
end;

class function TCefScrollViewRef.CreateScrollView(const delegate: ICefViewDelegate): ICefScrollView;
var
  TempScrollView : PCefScrollView;
begin
  Result := nil;

  if (delegate <> nil) then
    begin
      TempScrollView := cef_scroll_view_create(CefGetData(delegate));

      if (TempScrollView <> nil) then
        Result := Create(TempScrollView) as ICefScrollView;
    end;
end;

end.