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CEF4Delphi/source/uCEFKeyboardHandler.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 � 2020 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 uCEFKeyboardHandler;
{$IFDEF FPC}
{$MODE OBJFPC}{$H+}
{$ENDIF}
{$IFNDEF CPUX64}{$ALIGN ON}{$ENDIF}
{$MINENUMSIZE 4}
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{$I cef.inc}
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interface
uses
uCEFBaseRefCounted, uCEFInterfaces, uCEFTypes;
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type
TCefKeyboardHandlerOwn = class(TCefBaseRefCountedOwn, ICefKeyboardHandler)
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protected
function OnPreKeyEvent(const browser: ICefBrowser; const event: PCefKeyEvent; osEvent: TCefEventHandle; out isKeyboardShortcut: Boolean): Boolean; virtual;
function OnKeyEvent(const browser: ICefBrowser; const event: PCefKeyEvent; osEvent: TCefEventHandle): Boolean; virtual;
procedure RemoveReferences; virtual;
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public
constructor Create; virtual;
end;
TCustomKeyboardHandler = class(TCefKeyboardHandlerOwn)
protected
FEvents : Pointer;
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function OnPreKeyEvent(const browser: ICefBrowser; const event: PCefKeyEvent; osEvent: TCefEventHandle; out isKeyboardShortcut: Boolean): Boolean; override;
function OnKeyEvent(const browser: ICefBrowser; const event: PCefKeyEvent; osEvent: TCefEventHandle): Boolean; override;
procedure RemoveReferences; override;
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public
constructor Create(const events : IChromiumEvents); reintroduce; virtual;
destructor Destroy; override;
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end;
implementation
uses
{$IFDEF DELPHI16_UP}
System.SysUtils,
{$ELSE}
SysUtils,
{$ENDIF}
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uCEFMiscFunctions, uCEFLibFunctions, uCEFBrowser;
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function cef_keyboard_handler_on_pre_key_event( self : PCefKeyboardHandler;
browser : PCefBrowser;
const event : PCefKeyEvent;
os_event : TCefEventHandle;
is_keyboard_shortcut : PInteger): Integer; stdcall;
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var
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TempShortcut : Boolean;
TempObject : TObject;
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begin
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Result := Ord(False);
TempShortcut := is_keyboard_shortcut^ <> 0;
TempObject := CefGetObject(self);
if (TempObject <> nil) and (TempObject is TCefKeyboardHandlerOwn) then
Result := Ord(TCefKeyboardHandlerOwn(TempObject).OnPreKeyEvent(TCefBrowserRef.UnWrap(browser),
event,
os_event,
TempShortcut));
is_keyboard_shortcut^ := Ord(TempShortcut);
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end;
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function cef_keyboard_handler_on_key_event( self : PCefKeyboardHandler;
browser : PCefBrowser;
const event : PCefKeyEvent;
os_event : TCefEventHandle): Integer; stdcall;
var
TempObject : TObject;
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begin
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Result := Ord(False);
TempObject := CefGetObject(self);
if (TempObject <> nil) and (TempObject is TCefKeyboardHandlerOwn) then
Result := Ord(TCefKeyboardHandlerOwn(TempObject).OnKeyEvent(TCefBrowserRef.UnWrap(browser),
event,
os_event));
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end;
constructor TCefKeyboardHandlerOwn.Create;
begin
inherited CreateData(SizeOf(TCefKeyboardHandler));
with PCefKeyboardHandler(FData)^ do
begin
on_pre_key_event := {$IFDEF FPC}@{$ENDIF}cef_keyboard_handler_on_pre_key_event;
on_key_event := {$IFDEF FPC}@{$ENDIF}cef_keyboard_handler_on_key_event;
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end;
end;
function TCefKeyboardHandlerOwn.OnPreKeyEvent(const browser: ICefBrowser; const event: PCefKeyEvent; osEvent: TCefEventHandle; out isKeyboardShortcut: Boolean): Boolean;
begin
Result := False;
end;
function TCefKeyboardHandlerOwn.OnKeyEvent(const browser: ICefBrowser; const event: PCefKeyEvent; osEvent: TCefEventHandle): Boolean;
begin
Result := False;
end;
procedure TCefKeyboardHandlerOwn.RemoveReferences;
begin
//
end;
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// TCustomKeyboardHandler
constructor TCustomKeyboardHandler.Create(const events : IChromiumEvents);
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begin
inherited Create;
FEvents := Pointer(events);
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end;
destructor TCustomKeyboardHandler.Destroy;
begin
RemoveReferences;
inherited Destroy;
end;
procedure TCustomKeyboardHandler.RemoveReferences;
begin
FEvents := nil;
end;
function TCustomKeyboardHandler.OnKeyEvent(const browser : ICefBrowser;
const event : PCefKeyEvent;
osEvent : TCefEventHandle): Boolean;
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begin
if (FEvents <> nil) then
Result := IChromiumEvents(FEvents).doOnKeyEvent(browser, event, osEvent)
else
Result := inherited OnKeyEvent(browser, event, osEvent);
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end;
function TCustomKeyboardHandler.OnPreKeyEvent(const browser : ICefBrowser;
const event : PCefKeyEvent;
osEvent : TCefEventHandle;
out isKeyboardShortcut : Boolean): Boolean;
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begin
if (FEvents <> nil) then
Result := IChromiumEvents(FEvents).doOnPreKeyEvent(browser, event, osEvent, isKeyboardShortcut)
else
Result := inherited OnPreKeyEvent(browser, event, osEvent, isKeyboardShortcut);
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end;
end.