mirror of
https://github.com/salvadordf/CEF4Delphi.git
synced 2024-12-14 09:42:54 +02:00
1299a6f596
- Split the Lazarus demos directory into "Lazarus_Windows" and "Lazarus_Linux". - Added OSRExternalPumpBrowser and TinyBrowser2 demos to "Lazarus_Linux". - Set TBufferPanel.GetScreenScale as virtual. - Added DevTools to the SchemeRegistrationBrowser demo. - Modified the SchemeRegistrationBrowser demo to receive XMLHttpRequest requests from JavaScript.
820 lines
23 KiB
ObjectPascal
820 lines
23 KiB
ObjectPascal
// ************************************************************************
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// ***************************** CEF4Delphi *******************************
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// ************************************************************************
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//
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// CEF4Delphi is based on DCEF3 which uses CEF to embed a chromium-based
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// browser in Delphi applications.
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//
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// The original license of DCEF3 still applies to CEF4Delphi.
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//
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// For more information about CEF4Delphi visit :
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// https://www.briskbard.com/index.php?lang=en&pageid=cef
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//
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// Copyright © 2020 Salvador Diaz Fau. All rights reserved.
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//
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// ************************************************************************
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// ************ vvvv Original license and comments below vvvv *************
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// ************************************************************************
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(*
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* Delphi Chromium Embedded 3
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*
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* Usage allowed under the restrictions of the Lesser GNU General Public License
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* or alternatively the restrictions of the Mozilla Public License 1.1
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for
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* the specific language governing rights and limitations under the License.
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*
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* Unit owner : Henri Gourvest <hgourvest@gmail.com>
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* Web site : http://www.progdigy.com
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* Repository : http://code.google.com/p/delphichromiumembedded/
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* Group : http://groups.google.com/group/delphichromiumembedded
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*
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* Embarcadero Technologies, Inc is not permitted to use or redistribute
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* this source code without explicit permission.
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*
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*)
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unit uCEFBufferPanel;
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{$IFDEF FPC}
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{$MODE OBJFPC}{$H+}
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{$ENDIF}
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{$I cef.inc}
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interface
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uses
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{$IFDEF DELPHI16_UP}
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{$IFDEF MSWINDOWS}Winapi.Windows, Winapi.Messages, Vcl.ExtCtrls, Vcl.Controls, Vcl.Graphics, WinApi.Imm, {$ENDIF}
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System.Classes, System.SyncObjs, System.SysUtils, Vcl.Forms,
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{$ELSE}
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{$IFDEF MSWINDOWS}Windows, imm, {$ENDIF} Classes, Forms, Controls, Graphics,
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{$IFDEF FPC}
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LCLProc, LCLType, LCLIntf, LResources, LMessages, InterfaceBase, {$IFDEF MSWINDOWS}Win32Extra,{$ENDIF}
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{$ELSE}
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Messages,
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{$ENDIF}
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ExtCtrls, SyncObjs, SysUtils,
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{$ENDIF}
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{$IFDEF MSWINDOWS}uCEFOSRIMEHandler,{$ENDIF} uCEFConstants, uCEFTypes;
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type
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TOnIMECommitTextEvent = procedure(Sender: TObject; const aText : ustring; const replacement_range : PCefRange; relative_cursor_pos : integer) of object;
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TOnIMESetCompositionEvent = procedure(Sender: TObject; const aText : ustring; const underlines : TCefCompositionUnderlineDynArray; const replacement_range, selection_range : TCefRange) of object;
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{$IFDEF MSWINDOWS}
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TOnHandledMessageEvent = procedure(Sender: TObject; var aMessage: TMessage; var aHandled : boolean) of object;
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{$ENDIF}
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{$IFNDEF FPC}{$IFDEF DELPHI16_UP}[ComponentPlatformsAttribute(pidWin32 or pidWin64)]{$ENDIF}{$ENDIF}
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TBufferPanel = class(TCustomPanel)
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protected
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FMutex : THandle;
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FBuffer : TBitmap;
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FScanlineSize : integer;
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FTransparent : boolean;
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FOnPaintParentBkg : TNotifyEvent;
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{$IFDEF MSWINDOWS}
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FIMEHandler : TCEFOSRIMEHandler;
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FOnIMECancelComposition : TNotifyEvent;
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FOnIMECommitText : TOnIMECommitTextEvent;
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FOnIMESetComposition : TOnIMESetCompositionEvent;
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FOnCustomTouch : TOnHandledMessageEvent;
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FOnPointerDown : TOnHandledMessageEvent;
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FOnPointerUp : TOnHandledMessageEvent;
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FOnPointerUpdate : TOnHandledMessageEvent;
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{$ENDIF}
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procedure CreateSyncObj;
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procedure DestroySyncObj;
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procedure DestroyBuffer;
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function GetBufferBits : pointer;
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function GetBufferWidth : integer;
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function GetBufferHeight : integer;
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function GetScreenScale : single; virtual;
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{$IFDEF MSWINDOWS}
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function GetParentFormHandle : TCefWindowHandle;
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function GetParentForm : TCustomForm;
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{$ENDIF}
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procedure SetTransparent(aValue : boolean);
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function CopyBuffer : boolean;
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function SaveBufferToFile(const aFilename : string) : boolean;
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procedure Paint; override;
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{$IFDEF MSWINDOWS}
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procedure CreateParams(var Params: TCreateParams); override;
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procedure WndProc(var aMessage: TMessage); override;
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procedure WMEraseBkgnd(var aMessage : TWMEraseBkgnd); message WM_ERASEBKGND;
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procedure WMTouch(var aMessage: TMessage); message WM_TOUCH;
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procedure WMPointerDown(var aMessage: TMessage); message WM_POINTERDOWN;
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procedure WMPointerUpdate(var aMessage: TMessage); message WM_POINTERUPDATE;
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procedure WMPointerUp(var aMessage: TMessage); message WM_POINTERUP;
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procedure WMIMEStartComp(var aMessage: TMessage);
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procedure WMIMEEndComp(var aMessage: TMessage);
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procedure WMIMESetContext(var aMessage: TMessage);
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procedure WMIMEComposition(var aMessage: TMessage);
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{$ENDIF}
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public
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constructor Create(AOwner: TComponent); override;
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destructor Destroy; override;
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procedure AfterConstruction; override;
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function SaveToFile(const aFilename : string) : boolean;
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function InvalidatePanel : boolean;
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function BeginBufferDraw : boolean;
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procedure EndBufferDraw;
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procedure BufferDraw(x, y : integer; const aBitmap : TBitmap); overload;
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procedure BufferDraw(const aBitmap : TBitmap; const aSrcRect, aDstRect : TRect); overload;
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function UpdateBufferDimensions(aWidth, aHeight : integer) : boolean;
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function BufferIsResized(aUseMutex : boolean = True) : boolean;
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procedure CreateIMEHandler;
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procedure ChangeCompositionRange(const selection_range : TCefRange; const character_bounds : TCefRectDynArray);
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property Buffer : TBitmap read FBuffer;
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property ScanlineSize : integer read FScanlineSize;
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property BufferWidth : integer read GetBufferWidth;
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property BufferHeight : integer read GetBufferHeight;
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property BufferBits : pointer read GetBufferBits;
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property ScreenScale : single read GetScreenScale;
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{$IFDEF MSWINDOWS}
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property ParentFormHandle : TCefWindowHandle read GetParentFormHandle;
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property ParentForm : TCustomForm read GetParentForm;
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{$ENDIF}
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property DockManager;
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property Canvas;
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published
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{$IFDEF MSWINDOWS}
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property OnIMECancelComposition : TNotifyEvent read FOnIMECancelComposition write FOnIMECancelComposition;
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property OnIMECommitText : TOnIMECommitTextEvent read FOnIMECommitText write FOnIMECommitText;
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property OnIMESetComposition : TOnIMESetCompositionEvent read FOnIMESetComposition write FOnIMESetComposition;
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property OnCustomTouch : TOnHandledMessageEvent read FOnCustomTouch write FOnCustomTouch;
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property OnPointerDown : TOnHandledMessageEvent read FOnPointerDown write FOnPointerDown;
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property OnPointerUp : TOnHandledMessageEvent read FOnPointerUp write FOnPointerUp;
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property OnPointerUpdate : TOnHandledMessageEvent read FOnPointerUpdate write FOnPointerUpdate;
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{$ENDIF}
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property OnPaintParentBkg : TNotifyEvent read FOnPaintParentBkg write FOnPaintParentBkg;
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property Transparent : boolean read FTransparent write SetTransparent default False;
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property Align;
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property Alignment;
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property Anchors;
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property AutoSize;
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{$IFDEF FPC}
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property OnUTF8KeyPress;
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{$ELSE}
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property BevelEdges;
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property BevelKind;
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property Ctl3D;
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property Locked;
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property ParentBackground;
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property ParentCtl3D;
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property OnCanResize;
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{$ENDIF}
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property BevelInner;
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property BevelOuter;
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property BevelWidth;
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property BiDiMode;
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property BorderWidth;
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property BorderStyle;
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property Caption;
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property Color;
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property Constraints;
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property UseDockManager default True;
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property DockSite;
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property DoubleBuffered;
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property DragCursor;
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property DragKind;
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property DragMode;
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property Enabled;
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property FullRepaint;
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property Font;
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property ParentBiDiMode;
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property ParentColor;
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property ParentFont;
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property ParentShowHint;
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property PopupMenu;
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property ShowHint;
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property TabOrder;
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property TabStop;
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property Visible;
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property OnClick;
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property OnConstrainedResize;
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property OnContextPopup;
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property OnDockDrop;
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property OnDockOver;
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property OnDblClick;
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property OnDragDrop;
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property OnDragOver;
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property OnEndDock;
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property OnEndDrag;
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property OnEnter;
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property OnExit;
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property OnGetSiteInfo;
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property OnMouseDown;
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property OnMouseMove;
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property OnMouseUp;
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property OnMouseWheel;
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property OnKeyDown;
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property OnKeyPress;
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property OnKeyUp;
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property OnResize;
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property OnStartDock;
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property OnStartDrag;
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property OnUnDock;
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{$IFDEF DELPHI9_UP}
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property VerticalAlignment;
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property OnAlignInsertBefore;
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property OnAlignPosition;
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{$ENDIF}
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{$IFDEF DELPHI10_UP}
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property Padding;
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property OnMouseActivate;
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property OnMouseEnter;
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property OnMouseLeave;
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{$ENDIF}
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{$IFDEF DELPHI12_UP}
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property ShowCaption;
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property ParentDoubleBuffered;
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{$ENDIF}
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{$IFDEF DELPHI14_UP}
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property Touch;
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property OnGesture;
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{$ENDIF}
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{$IFDEF DELPHI17_UP}
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property StyleElements;
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{$ENDIF}
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end;
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{$IFDEF FPC}
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procedure Register;
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{$ENDIF}
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implementation
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uses
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uCEFMiscFunctions, uCEFApplicationCore;
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constructor TBufferPanel.Create(AOwner: TComponent);
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begin
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inherited Create(AOwner);
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FMutex := 0;
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FBuffer := nil;
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FTransparent := False;
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FOnPaintParentBkg := nil;
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{$IFDEF MSWINDOWS}
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FIMEHandler := nil;
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FOnIMECancelComposition := nil;
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FOnIMECommitText := nil;
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FOnIMESetComposition := nil;
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FOnCustomTouch := nil;
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FOnPointerDown := nil;
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FOnPointerUp := nil;
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FOnPointerUpdate := nil;
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{$ENDIF}
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end;
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destructor TBufferPanel.Destroy;
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begin
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DestroyBuffer;
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DestroySyncObj;
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{$IFDEF MSWINDOWS}
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if (FIMEHandler <> nil) then FreeAndNil(FIMEHandler);
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{$ENDIF}
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inherited Destroy;
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end;
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procedure TBufferPanel.AfterConstruction;
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begin
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inherited AfterConstruction;
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CreateSyncObj;
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{$IFDEF MSWINDOWS}
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{$IFNDEF FPC}
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ImeMode := imDontCare;
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ImeName := '';
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{$ENDIF}
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{$ENDIF}
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end;
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procedure TBufferPanel.CreateIMEHandler;
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begin
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{$IFDEF MSWINDOWS}
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if (FIMEHandler = nil) and HandleAllocated then
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FIMEHandler := TCEFOSRIMEHandler.Create(Handle);
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{$ENDIF}
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end;
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procedure TBufferPanel.ChangeCompositionRange(const selection_range : TCefRange;
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const character_bounds : TCefRectDynArray);
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begin
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{$IFDEF MSWINDOWS}
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if (FIMEHandler <> nil) then
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FIMEHandler.ChangeCompositionRange(selection_range, character_bounds);
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{$ENDIF}
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end;
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procedure TBufferPanel.CreateSyncObj;
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begin
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{$IFDEF MSWINDOWS}
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FMutex := CreateMutex(nil, False, nil);
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{$ENDIF}
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end;
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procedure TBufferPanel.DestroySyncObj;
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begin
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{$IFDEF MSWINDOWS}
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if (FMutex <> 0) then
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begin
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CloseHandle(FMutex);
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FMutex := 0;
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end;
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{$ENDIF}
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end;
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procedure TBufferPanel.DestroyBuffer;
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begin
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if BeginBufferDraw then
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begin
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if (FBuffer <> nil) then FreeAndNil(FBuffer);
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EndBufferDraw;
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end;
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end;
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function TBufferPanel.SaveBufferToFile(const aFilename : string) : boolean;
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begin
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Result := False;
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try
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if (FBuffer <> nil) then
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begin
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FBuffer.SaveToFile(aFilename);
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Result := True;
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end;
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except
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on e : exception do
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if CustomExceptionHandler('TBufferPanel.SaveBufferToFile', e) then raise;
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end;
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end;
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function TBufferPanel.SaveToFile(const aFilename : string) : boolean;
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begin
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Result := False;
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if BeginBufferDraw then
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begin
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Result := SaveBufferToFile(aFilename);
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EndBufferDraw;
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end;
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end;
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function TBufferPanel.InvalidatePanel : boolean;
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begin
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{$IFDEF MSWINDOWS}
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Result := HandleAllocated and PostMessage(Handle, CM_INVALIDATE, 0, 0);
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{$ENDIF}
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end;
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function TBufferPanel.BeginBufferDraw : boolean;
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begin
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{$IFDEF MSWINDOWS}
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Result := (FMutex <> 0) and (WaitForSingleObject(FMutex, 5000) = WAIT_OBJECT_0);
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{$ENDIF}
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end;
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procedure TBufferPanel.EndBufferDraw;
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begin
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{$IFDEF MSWINDOWS}
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if (FMutex <> 0) then ReleaseMutex(FMutex);
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{$ENDIF}
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end;
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function TBufferPanel.CopyBuffer : boolean;
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{$IFDEF MSWINDOWS}
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var
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TempFunction : TBlendFunction;
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{$ENDIF}
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begin
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Result := False;
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{$IFDEF MSWINDOWS}
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if BeginBufferDraw then
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try
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if (FBuffer <> nil) then
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begin
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if FTransparent then
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begin
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// TODO : To avoid flickering we should be using another bitmap
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// for the background image. We should blend "FBuffer" with the
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// "background bitmap" and then blit the result to the canvas.
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if assigned(FOnPaintParentBkg) then FOnPaintParentBkg(self);
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TempFunction.BlendOp := AC_SRC_OVER;
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TempFunction.BlendFlags := 0;
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TempFunction.SourceConstantAlpha := 255;
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TempFunction.AlphaFormat := AC_SRC_ALPHA;
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Result := AlphaBlend(Canvas.Handle, 0, 0, Width, Height,
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FBuffer.Canvas.Handle, 0, 0, FBuffer.Width, FBuffer.Height,
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TempFunction);
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end
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else
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Result := BitBlt(Canvas.Handle, 0, 0, Width, Height,
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FBuffer.Canvas.Handle, 0, 0,
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SrcCopy);
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end;
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finally
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EndBufferDraw;
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end;
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{$ENDIF}
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end;
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procedure TBufferPanel.Paint;
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begin
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if csDesigning in ComponentState then
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begin
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Canvas.Font.Assign(Font);
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Canvas.Brush.Color := Color;
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Canvas.Brush.Style := bsSolid;
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Canvas.Pen.Style := psDash;
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Canvas.Rectangle(0, 0, Width, Height);
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end
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else
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if not(CopyBuffer) and not(FTransparent) then
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begin
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Canvas.Brush.Color := Color;
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Canvas.Brush.Style := bsSolid;
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Canvas.FillRect(rect(0, 0, Width, Height));
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end;
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end;
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{$IFDEF MSWINDOWS}
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procedure TBufferPanel.CreateParams(var Params: TCreateParams);
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begin
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inherited CreateParams(Params);
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if FTransparent then
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Params.ExStyle := Params.ExStyle and not WS_EX_TRANSPARENT;
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end;
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procedure TBufferPanel.WndProc(var aMessage: TMessage);
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begin
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case aMessage.Msg of
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WM_IME_STARTCOMPOSITION : WMIMEStartComp(aMessage);
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WM_IME_COMPOSITION : WMIMEComposition(aMessage);
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WM_IME_ENDCOMPOSITION :
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begin
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WMIMEEndComp(aMessage);
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inherited WndProc(aMessage);
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end;
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WM_IME_SETCONTEXT :
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begin
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aMessage.LParam := aMessage.LParam and not(ISC_SHOWUICOMPOSITIONWINDOW);
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inherited WndProc(aMessage);
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WMIMESetContext(aMessage);
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end;
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else inherited WndProc(aMessage);
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end;
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end;
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procedure TBufferPanel.WMEraseBkgnd(var aMessage : TWMEraseBkgnd);
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begin
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aMessage.Result := 1;
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end;
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procedure TBufferPanel.WMTouch(var aMessage: TMessage);
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var
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TempHandled : boolean;
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begin
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TempHandled := False;
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{$IFDEF MSWINDOWS}
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if assigned(FOnCustomTouch) then FOnCustomTouch(self, aMessage, TempHandled);
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{$ENDIF}
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if not(TempHandled) then inherited;
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end;
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procedure TBufferPanel.WMPointerDown(var aMessage: TMessage);
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var
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TempHandled : boolean;
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begin
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TempHandled := False;
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{$IFDEF MSWINDOWS}
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if assigned(FOnPointerDown) then FOnPointerDown(self, aMessage, TempHandled);
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{$ENDIF}
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if not(TempHandled) then inherited;
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end;
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procedure TBufferPanel.WMPointerUpdate(var aMessage: TMessage);
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var
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TempHandled : boolean;
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begin
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TempHandled := False;
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{$IFDEF MSWINDOWS}
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if assigned(FOnPointerUpdate) then FOnPointerUpdate(self, aMessage, TempHandled);
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{$ENDIF}
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if not(TempHandled) then inherited;
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end;
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procedure TBufferPanel.WMPointerUp(var aMessage: TMessage);
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var
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TempHandled : boolean;
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begin
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TempHandled := False;
|
|
{$IFDEF MSWINDOWS}
|
|
if assigned(FOnPointerUp) then FOnPointerUp(self, aMessage, TempHandled);
|
|
{$ENDIF}
|
|
if not(TempHandled) then inherited;
|
|
end;
|
|
|
|
procedure TBufferPanel.WMIMEStartComp(var aMessage: TMessage);
|
|
begin
|
|
if (FIMEHandler <> nil) then
|
|
begin
|
|
{$IFNDEF FPC}
|
|
FInImeComposition := False;
|
|
{$ENDIF}
|
|
|
|
FIMEHandler.CreateImeWindow;
|
|
FIMEHandler.MoveImeWindow;
|
|
FIMEHandler.ResetComposition;
|
|
end;
|
|
end;
|
|
|
|
procedure TBufferPanel.WMIMEEndComp(var aMessage: TMessage);
|
|
begin
|
|
if assigned(FOnIMECancelComposition) then FOnIMECancelComposition(self);
|
|
|
|
if (FIMEHandler <> nil) then
|
|
begin
|
|
FIMEHandler.ResetComposition;
|
|
FIMEHandler.DestroyImeWindow;
|
|
end;
|
|
end;
|
|
|
|
procedure TBufferPanel.WMIMESetContext(var aMessage: TMessage);
|
|
begin
|
|
if (FIMEHandler <> nil) then
|
|
begin
|
|
FIMEHandler.CreateImeWindow;
|
|
FIMEHandler.MoveImeWindow;
|
|
end;
|
|
end;
|
|
|
|
procedure TBufferPanel.WMIMEComposition(var aMessage: TMessage);
|
|
var
|
|
TempText : ustring;
|
|
TempRange : TCefRange;
|
|
TempCompStart : integer;
|
|
TempUnderlines : TCefCompositionUnderlineDynArray;
|
|
TempSelection : TCefRange;
|
|
begin
|
|
TempText := '';
|
|
TempCompStart := 0;
|
|
TempUnderlines := nil;
|
|
|
|
try
|
|
if (FIMEHandler <> nil) then
|
|
begin
|
|
if FIMEHandler.GetResult(aMessage.LParam, TempText) then
|
|
begin
|
|
if assigned(FOnIMECommitText) then
|
|
begin
|
|
TempRange.from := high(Integer);
|
|
TempRange.to_ := high(Integer);
|
|
|
|
FOnIMECommitText(self, TempText, @TempRange, 0);
|
|
end;
|
|
|
|
FIMEHandler.ResetComposition;
|
|
end;
|
|
|
|
if FIMEHandler.GetComposition(aMessage.LParam, TempText, TempUnderlines, TempCompStart) then
|
|
begin
|
|
if assigned(FOnIMESetComposition) then
|
|
begin
|
|
TempRange.from := high(Integer);
|
|
TempRange.to_ := high(Integer);
|
|
|
|
TempSelection.from := TempCompStart;
|
|
TempSelection.to_ := TempCompStart + length(TempText);
|
|
|
|
FOnIMESetComposition(self, TempText, TempUnderlines, TempRange, TempSelection);
|
|
end;
|
|
|
|
FIMEHandler.UpdateCaretPosition(pred(TempCompStart));
|
|
end
|
|
else
|
|
begin
|
|
if assigned(FOnIMECancelComposition) then FOnIMECancelComposition(self);
|
|
|
|
FIMEHandler.ResetComposition;
|
|
FIMEHandler.DestroyImeWindow;
|
|
end;
|
|
end;
|
|
finally
|
|
if (TempUnderlines <> nil) then
|
|
begin
|
|
Finalize(TempUnderlines);
|
|
TempUnderlines := nil;
|
|
end;
|
|
end;
|
|
end;
|
|
{$ENDIF}
|
|
|
|
function TBufferPanel.GetBufferBits : pointer;
|
|
begin
|
|
if (FBuffer <> nil) then
|
|
Result := FBuffer.Scanline[pred(FBuffer.Height)]
|
|
else
|
|
Result := nil;
|
|
end;
|
|
|
|
function TBufferPanel.GetBufferWidth : integer;
|
|
begin
|
|
if (FBuffer <> nil) then
|
|
Result := FBuffer.Width
|
|
else
|
|
Result := 0;
|
|
end;
|
|
|
|
function TBufferPanel.GetBufferHeight : integer;
|
|
begin
|
|
if (FBuffer <> nil) then
|
|
Result := FBuffer.Height
|
|
else
|
|
Result := 0;
|
|
end;
|
|
|
|
function TBufferPanel.GetScreenScale : single;
|
|
{$IFDEF MSWINDOWS}
|
|
var
|
|
TempHandle : TCefWindowHandle;
|
|
TempDC : HDC;
|
|
TempDPI : UINT;
|
|
{$ENDIF}
|
|
begin
|
|
{$IFDEF MSWINDOWS}
|
|
TempHandle := ParentFormHandle;
|
|
|
|
if (TempHandle <> 0) then
|
|
begin
|
|
if RunningWindows10OrNewer and GetDPIForHandle(TempHandle, TempDPI) then
|
|
Result := TempDPI / USER_DEFAULT_SCREEN_DPI
|
|
else
|
|
begin
|
|
TempDC := GetWindowDC(TempHandle);
|
|
Result := GetDeviceCaps(TempDC, LOGPIXELSX) / USER_DEFAULT_SCREEN_DPI;
|
|
ReleaseDC(TempHandle, TempDC);
|
|
end;
|
|
end
|
|
else
|
|
{$ENDIF}
|
|
if (GlobalCEFApp <> nil) then
|
|
Result := GlobalCEFApp.DeviceScaleFactor
|
|
else
|
|
Result := 1;
|
|
end;
|
|
|
|
{$IFDEF MSWINDOWS}
|
|
function TBufferPanel.GetParentForm : TCustomForm;
|
|
var
|
|
TempComp : TComponent;
|
|
begin
|
|
Result := nil;
|
|
TempComp := Owner;
|
|
|
|
while (TempComp <> nil) do
|
|
if (TempComp is TCustomForm) then
|
|
begin
|
|
Result := TCustomForm(TempComp);
|
|
exit;
|
|
end
|
|
else
|
|
TempComp := TempComp.owner;
|
|
end;
|
|
|
|
function TBufferPanel.GetParentFormHandle : TCefWindowHandle;
|
|
var
|
|
TempForm : TCustomForm;
|
|
begin
|
|
Result := 0;
|
|
TempForm := GetParentForm;
|
|
|
|
if (TempForm <> nil) then
|
|
Result := TempForm.Handle
|
|
else
|
|
if (Application <> nil) and
|
|
(Application.MainForm <> nil) then
|
|
Result := Application.MainForm.Handle;
|
|
end;
|
|
{$ENDIF}
|
|
|
|
procedure TBufferPanel.SetTransparent(aValue : boolean);
|
|
begin
|
|
if (FTransparent <> aValue) then
|
|
begin
|
|
FTransparent := aValue;
|
|
|
|
{$IFDEF MSWINDOWS}
|
|
RecreateWnd{$IFDEF FPC}(self){$ENDIF};
|
|
{$ENDIF}
|
|
end;
|
|
end;
|
|
|
|
procedure TBufferPanel.BufferDraw(x, y : integer; const aBitmap : TBitmap);
|
|
begin
|
|
if (FBuffer <> nil) then FBuffer.Canvas.Draw(x, y, aBitmap);
|
|
end;
|
|
|
|
procedure TBufferPanel.BufferDraw(const aBitmap : TBitmap; const aSrcRect, aDstRect : TRect);
|
|
begin
|
|
if (FBuffer <> nil) then FBuffer.Canvas.CopyRect(aDstRect, aBitmap.Canvas, aSrcRect);
|
|
end;
|
|
|
|
function TBufferPanel.UpdateBufferDimensions(aWidth, aHeight : integer) : boolean;
|
|
begin
|
|
Result := False;
|
|
|
|
if ((FBuffer = nil) or
|
|
(FBuffer.Width <> aWidth) or
|
|
(FBuffer.Height <> aHeight)) then
|
|
begin
|
|
if (FBuffer <> nil) then FreeAndNil(FBuffer);
|
|
|
|
FBuffer := TBitmap.Create;
|
|
FBuffer.PixelFormat := pf32bit;
|
|
FBuffer.HandleType := bmDIB;
|
|
FBuffer.Width := aWidth;
|
|
FBuffer.Height := aHeight;
|
|
|
|
FScanlineSize := FBuffer.Width * SizeOf(TRGBQuad);
|
|
Result := True;
|
|
end;
|
|
end;
|
|
|
|
function TBufferPanel.BufferIsResized(aUseMutex : boolean) : boolean;
|
|
var
|
|
TempDevWidth, TempLogWidth, TempDevHeight, TempLogHeight : integer;
|
|
TempScale : single;
|
|
begin
|
|
Result := False;
|
|
if (GlobalCEFApp = nil) then exit;
|
|
|
|
if not(aUseMutex) or BeginBufferDraw then
|
|
begin
|
|
TempScale := ScreenScale;
|
|
|
|
if (TempScale = 1) then
|
|
begin
|
|
Result := (FBuffer <> nil) and
|
|
(FBuffer.Width = Width) and
|
|
(FBuffer.Height = Height);
|
|
end
|
|
else
|
|
begin
|
|
// CEF and Chromium use 'floor' to round the float values in Device <-> Logical unit conversions
|
|
// and Delphi uses MulDiv, which uses the bankers rounding, to resize the components in high DPI mode.
|
|
// This is the cause of slight differences in size between the buffer and the panel in some occasions.
|
|
|
|
TempLogWidth := DeviceToLogical(Width, TempScale);
|
|
TempLogHeight := DeviceToLogical(Height, TempScale);
|
|
|
|
TempDevWidth := LogicalToDevice(TempLogWidth, TempScale);
|
|
TempDevHeight := LogicalToDevice(TempLogHeight, TempScale);
|
|
|
|
Result := (FBuffer <> nil) and
|
|
(FBuffer.Width = TempDevWidth) and
|
|
(FBuffer.Height = TempDevHeight);
|
|
end;
|
|
|
|
if aUseMutex then EndBufferDraw;
|
|
end;
|
|
end;
|
|
|
|
{$IFDEF FPC}
|
|
procedure Register;
|
|
begin
|
|
{$I res/tbufferpanel.lrs}
|
|
RegisterComponents('Chromium', [TBufferPanel]);
|
|
end;
|
|
{$ENDIF}
|
|
|
|
end.
|