1
0
mirror of https://github.com/salvadordf/CEF4Delphi.git synced 2024-12-14 09:42:54 +02:00
CEF4Delphi/source/uCEFScrollViewComponent.pas
2021-01-01 11:11:30 +01:00

243 lines
7.5 KiB
ObjectPascal

// ************************************************************************
// ***************************** 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 © 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 uCEFScrollViewComponent;
{$IFDEF FPC}
{$MODE OBJFPC}{$H+}
{$ENDIF}
{$IFNDEF CPUX64}{$ALIGN ON}{$ENDIF}
{$MINENUMSIZE 4}
{$I cef.inc}
interface
uses
{$IFDEF DELPHI16_UP}
{$IFDEF MSWINDOWS}WinApi.Windows,{$ENDIF} System.Classes,
{$ELSE}
{$IFDEF MSWINDOWS}Windows,{$ENDIF} Classes,
{$IFDEF FPC}
LCLProc, LCLType, LCLIntf, LResources, InterfaceBase,
{$ENDIF}
{$ENDIF}
uCEFTypes, uCEFInterfaces, uCEFViewsFrameworkEvents, uCEFViewComponent;
type
{$IFNDEF FPC}{$IFDEF DELPHI16_UP}[ComponentPlatformsAttribute(pidWin32 or pidWin64)]{$ENDIF}{$ENDIF}
TCEFScrollViewComponent = class(TCEFViewComponent)
protected
FScrollView : ICefScrollView;
procedure DestroyView; override;
procedure Initialize; override;
function GetInitialized : boolean; override;
function GetAsView : ICefView; override;
function GetAsScrollView : ICefScrollView; override;
function GetContentView : ICefView;
function GetVisibleContentRect : TCefRect;
function GetHasHorizontalScrollbar : boolean;
function GetHorizontalScrollbarHeight : Integer;
function GetHasVerticalScrollbar : boolean;
function GetVerticalScrollbarWidth : Integer;
procedure SetContentView(const view: ICefView);
// ICefViewDelegateEvents
procedure doCreateCustomView; override;
public
procedure CreateScrollView;
property ContentView : ICefView read GetContentView write SetContentView;
property VisibleContentRect : TCefRect read GetVisibleContentRect;
property HorizontalScrollbarHeight : Integer read GetHorizontalScrollbarHeight;
property VerticalScrollbarWidth : Integer read GetVerticalScrollbarWidth;
property HasHorizontalScrollbar : boolean read GetHasHorizontalScrollbar;
property HasVerticalScrollbar : boolean read GetHasVerticalScrollbar;
end;
{$IFDEF FPC}
procedure Register;
{$ENDIF}
// *********************************************************
// ********************** ATTENTION ! **********************
// *********************************************************
// ** **
// ** MANY OF THE EVENTS IN CEF4DELPHI COMPONENTS LIKE **
// ** TCHROMIUM, TFMXCHROMIUM OR TCEFAPPLICATION ARE **
// ** EXECUTED IN A CEF THREAD BY DEFAULT. **
// ** **
// ** WINDOWS CONTROLS MUST BE CREATED AND DESTROYED IN **
// ** THE SAME THREAD TO AVOID ERRORS. **
// ** SOME OF THEM RECREATE THE HANDLERS IF THEY ARE **
// ** MODIFIED AND CAN CAUSE THE SAME ERRORS. **
// ** **
// ** DON'T CREATE, MODIFY OR DESTROY WINDOWS CONTROLS **
// ** INSIDE THE CEF4DELPHI EVENTS AND USE **
// ** SYNCHRONIZATION OBJECTS TO PROTECT VARIABLES AND **
// ** FIELDS IF THEY ARE ALSO USED IN THE MAIN THREAD. **
// ** **
// ** READ THIS FOR MORE INFORMATION : **
// ** https://www.briskbard.com/index.php?pageid=cef **
// ** **
// ** USE OUR FORUMS FOR MORE QUESTIONS : **
// ** https://www.briskbard.com/forum/ **
// ** **
// *********************************************************
// *********************************************************
implementation
uses
uCEFScrollView, uCEFMiscFunctions, uCEFViewDelegate;
procedure TCEFScrollViewComponent.CreateScrollView;
begin
CreateView;
end;
procedure TCEFScrollViewComponent.doCreateCustomView;
var
TempDelegate : ICefViewDelegate;
begin
if (FScrollView = nil) then
try
TempDelegate := TCustomViewDelegate.Create(self);
FScrollView := TCefScrollViewRef.CreateScrollView(TempDelegate);
finally
TempDelegate := nil;
end;
end;
procedure TCEFScrollViewComponent.Initialize;
begin
inherited Initialize;
FScrollView := nil;
end;
procedure TCEFScrollViewComponent.DestroyView;
begin
FScrollView := nil;
end;
function TCEFScrollViewComponent.GetInitialized : boolean;
begin
Result := (FScrollView <> nil);
end;
function TCEFScrollViewComponent.GetAsView : ICefView;
begin
Result := FScrollView as ICefView;
end;
function TCEFScrollViewComponent.GetAsScrollView : ICefScrollView;
begin
Result := FScrollView;
end;
procedure TCEFScrollViewComponent.SetContentView(const view: ICefView);
begin
if Initialized then FScrollView.SetContentView(view);
end;
function TCEFScrollViewComponent.GetContentView : ICefView;
begin
if Initialized then
Result := FScrollView.GetContentView
else
Result := nil;
end;
function TCEFScrollViewComponent.GetVisibleContentRect : TCefRect;
var
TempRect : TCefRect;
begin
if Initialized then
TempRect := FScrollView.GetVisibleContentRect
else
begin
TempRect.x := 0;
TempRect.y := 0;
TempRect.width := 0;
TempRect.height := 0;
end;
Result := TempRect;
end;
function TCEFScrollViewComponent.GetHasHorizontalScrollbar : boolean;
begin
Result := Initialized and FScrollView.HasHorizontalScrollbar;
end;
function TCEFScrollViewComponent.GetHorizontalScrollbarHeight : Integer;
begin
if Initialized then
Result := FScrollView.GetHorizontalScrollbarHeight
else
Result := 0;
end;
function TCEFScrollViewComponent.GetHasVerticalScrollbar : boolean;
begin
Result := Initialized and FScrollView.HasVerticalScrollbar;
end;
function TCEFScrollViewComponent.GetVerticalScrollbarWidth : Integer;
begin
if Initialized then
Result := FScrollView.GetVerticalScrollbarWidth
else
Result := 0;
end;
{$IFDEF FPC}
procedure Register;
begin
{$I res/tcefscrollviewcomponent.lrs}
RegisterComponents('Chromium Views Framework', [TCEFScrollViewComponent]);
end;
{$ENDIF}
end.