mirror of
https://github.com/salvadordf/CEF4Delphi.git
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428 lines
11 KiB
ObjectPascal
428 lines
11 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 CEF3 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 © 2018 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 uBufferPanel;
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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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{$IFDEF MSWINDOWS}Winapi.Windows, Winapi.Messages, Vcl.ExtCtrls, Vcl.Controls, Vcl.Graphics,{$ENDIF}
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System.Classes, System.SyncObjs, System.SysUtils,
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{$ELSE}
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{$IFDEF MSWINDOWS}Windows,{$ENDIF} Classes, Forms, Controls, Graphics,
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{$IFDEF FPC}
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LCLProc, LCLType, LCLIntf, LResources, LMessages, InterfaceBase,
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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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uCEFConstants;
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type
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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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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 CopyBuffer : boolean;
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function SaveBufferToFile(const aFilename : string) : boolean;
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procedure Paint; override;
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procedure WMEraseBkgnd(var aMessage : TWMEraseBkgnd); message WM_ERASEBKGND;
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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);
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function UpdateBufferDimensions(aWidth, aHeight : integer) : boolean;
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function BufferIsResized(aUseMutex : boolean = True) : boolean;
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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 DockManager;
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published
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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, uCEFApplication;
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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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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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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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end;
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procedure TBufferPanel.CreateSyncObj;
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begin
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FMutex := CreateMutex(nil, False, nil);
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end;
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procedure TBufferPanel.DestroySyncObj;
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begin
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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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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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Result := HandleAllocated and PostMessage(Handle, CM_INVALIDATE, 0, 0);
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end;
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function TBufferPanel.BeginBufferDraw : boolean;
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begin
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Result := (FMutex <> 0) and (WaitForSingleObject(FMutex, 5000) = WAIT_OBJECT_0);
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end;
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procedure TBufferPanel.EndBufferDraw;
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begin
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if (FMutex <> 0) then ReleaseMutex(FMutex);
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end;
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function TBufferPanel.CopyBuffer : 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 := (FBuffer <> nil) and
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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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EndBufferDraw;
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end;
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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) 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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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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function TBufferPanel.GetBufferBits : pointer;
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begin
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if (FBuffer <> nil) then
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Result := FBuffer.Scanline[pred(FBuffer.Height)]
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else
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Result := nil;
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end;
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function TBufferPanel.GetBufferWidth : integer;
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begin
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if (FBuffer <> nil) then
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Result := FBuffer.Width
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else
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Result := 0;
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end;
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function TBufferPanel.GetBufferHeight : integer;
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begin
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if (FBuffer <> nil) then
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Result := FBuffer.Height
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else
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Result := 0;
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end;
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procedure TBufferPanel.BufferDraw(x, y : integer; const aBitmap : TBitmap);
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begin
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if (FBuffer <> nil) then FBuffer.Canvas.Draw(x, y, aBitmap);
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end;
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function TBufferPanel.UpdateBufferDimensions(aWidth, aHeight : integer) : boolean;
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begin
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Result := False;
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if ((FBuffer = nil) or
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(FBuffer.Width <> aWidth) or
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(FBuffer.Height <> aHeight)) then
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begin
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if (FBuffer <> nil) then FreeAndNil(FBuffer);
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FBuffer := TBitmap.Create;
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FBuffer.PixelFormat := pf32bit;
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FBuffer.HandleType := bmDIB;
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FBuffer.Width := aWidth;
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FBuffer.Height := aHeight;
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FScanlineSize := FBuffer.Width * SizeOf(TRGBQuad);
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Result := True;
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end;
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end;
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function TBufferPanel.BufferIsResized(aUseMutex : boolean) : boolean;
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var
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TempDevWidth, TempLogWidth, TempDevHeight, TempLogHeight : integer;
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begin
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Result := False;
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if (GlobalCEFApp = nil) then exit;
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if not(aUseMutex) or BeginBufferDraw then
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begin
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if (GlobalCEFApp.DeviceScaleFactor = 1) then
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begin
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Result := (FBuffer <> nil) and
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(FBuffer.Width = Width) and
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(FBuffer.Height = Height);
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end
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else
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begin
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// CEF and Chromium use 'floor' to round the float values in Device <-> Logical unit conversions
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// and Delphi uses MulDiv, which uses the bankers rounding, to resize the components in high DPI mode.
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// This is the cause of slight differences in size between the buffer and the panel in some occasions.
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TempLogWidth := DeviceToLogical(Width, GlobalCEFApp.DeviceScaleFactor);
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TempLogHeight := DeviceToLogical(Height, GlobalCEFApp.DeviceScaleFactor);
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TempDevWidth := LogicalToDevice(TempLogWidth, GlobalCEFApp.DeviceScaleFactor);
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TempDevHeight := LogicalToDevice(TempLogHeight, GlobalCEFApp.DeviceScaleFactor);
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Result := (FBuffer <> nil) and
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(FBuffer.Width = TempDevWidth) and
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(FBuffer.Height = TempDevHeight);
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end;
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if aUseMutex then EndBufferDraw;
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end;
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end;
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{$IFDEF FPC}
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procedure Register;
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begin
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{$I res/tbufferpanel.lrs}
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RegisterComponents('Chromium', [TBufferPanel]);
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end;
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{$ENDIF}
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end.
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