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CEF4Delphi/source/uCEFDragHandler.pas

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2017-01-27 17:37:51 +02:00
// ************************************************************************
// ***************************** 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 D�az 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 uCEFDragHandler;
{$IFNDEF CPUX64}
{$ALIGN ON}
{$MINENUMSIZE 4}
{$ENDIF}
interface
uses
uCEFBase, uCEFInterfaces, uCEFTypes;
type
TCefDragHandlerOwn = class(TCefBaseOwn, ICefDragHandler)
protected
function OnDragEnter(const browser: ICefBrowser; const dragData: ICefDragData; mask: TCefDragOperations): Boolean; virtual;
procedure OnDraggableRegionsChanged(const browser: ICefBrowser; regionsCount: NativeUInt; regions: PCefDraggableRegionArray); virtual;
public
constructor Create; virtual;
end;
TCustomDragHandler = class(TCefDragHandlerOwn)
protected
FEvent: IChromiumEvents;
function OnDragEnter(const browser: ICefBrowser; const dragData: ICefDragData; mask: TCefDragOperations): Boolean; override;
procedure OnDraggableRegionsChanged(const browser: ICefBrowser; regionsCount: NativeUInt; regions: PCefDraggableRegionArray); override;
public
constructor Create(const events: IChromiumEvents); reintroduce; virtual;
end;
implementation
uses
uCEFMiscFunctions, uCEFLibFunctions, uCEFBrowser, uCEFDragData;
function cef_drag_handler_on_drag_enter(self: PCefDragHandler; browser: PCefBrowser;
dragData: PCefDragData; mask: TCefDragOperations): Integer; stdcall;
begin
with TCefDragHandlerOwn(CefGetObject(self)) do
Result := Ord(OnDragEnter(TCefBrowserRef.UnWrap(browser), TCefDragDataRef.UnWrap(dragData), mask));
end;
procedure cef_drag_handler_on_draggable_regions_changed(self: PCefDragHandler;
browser: PCefBrowser; regionsCount: NativeUInt; regions: PCefDraggableRegionArray); stdcall;
begin
with TCefDragHandlerOwn(CefGetObject(self)) do
OnDraggableRegionsChanged(TCefBrowserRef.UnWrap(browser), regionsCount, regions);
end;
constructor TCefDragHandlerOwn.Create;
begin
CreateData(SizeOf(TCefDragHandler), False);
with PCefDragHandler(FData)^ do
begin
on_drag_enter := cef_drag_handler_on_drag_enter;
on_draggable_regions_changed := cef_drag_handler_on_draggable_regions_changed;
end;
end;
function TCefDragHandlerOwn.OnDragEnter(const browser: ICefBrowser;
const dragData: ICefDragData; mask: TCefDragOperations): Boolean;
begin
Result := False;
end;
procedure TCefDragHandlerOwn.OnDraggableRegionsChanged(
const browser: ICefBrowser; regionsCount: NativeUInt;
regions: PCefDraggableRegionArray);
begin
end;
// TCustomDragHandler
constructor TCustomDragHandler.Create(const events: IChromiumEvents);
begin
inherited Create;
FEvent := events;
end;
function TCustomDragHandler.OnDragEnter(const browser: ICefBrowser; const dragData: ICefDragData; mask: TCefDragOperations): Boolean;
begin
Result := FEvent.doOnDragEnter(browser, dragData, mask);
end;
procedure TCustomDragHandler.OnDraggableRegionsChanged(const browser: ICefBrowser; regionsCount: NativeUInt; regions: PCefDraggableRegionArray);
begin
FEvent.doOnDraggableRegionsChanged(browser, regionsCount, regions);
end;
end.