mirror of
https://github.com/salvadordf/CEF4Delphi.git
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596 lines
16 KiB
ObjectPascal
596 lines
16 KiB
ObjectPascal
unit uCEFFMXBufferPanel;
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{$I cef.inc}
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interface
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uses
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{$IFDEF MSWINDOWS}
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Winapi.Windows, FMX.Platform.Win,
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{$ELSE}
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System.SyncObjs,
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{$ENDIF}
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System.Classes, System.UIConsts, System.Types, System.UITypes,
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{$IFDEF DELPHI19_UP}
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FMX.Graphics,
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{$ENDIF}
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FMX.Types, FMX.Controls, FMX.Forms,
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uCEFTypes, uCEFConstants;
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type
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TDialogKeyEvent = procedure(Sender: TObject; var Key: Word; Shift: TShiftState) of object;
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{$IFNDEF FPC}{$IFDEF DELPHI16_UP}[ComponentPlatformsAttribute(pfidWindows or pfidOSX or pfidLinux)]{$ENDIF}{$ENDIF}
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/// <summary>
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/// TBufferPanel is used by FMX applications with browsers in OSR mode
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/// to draw the browser contents. See the FMXExternalPumpBrowser demo for more details.
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/// </summary>
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TFMXBufferPanel = class(TControl)
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protected
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{$IFDEF MSWINDOWS}
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FMutex : THandle;
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{$ELSE}
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FBufferCS : TCriticalSection;
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{$ENDIF}
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FBuffer : TBitmap;
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FScanlineSize : integer;
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FColor : TAlphaColor;
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FHighSpeedDrawing : boolean;
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FOnDialogKey : TDialogKeyEvent;
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FForcedDeviceScaleFactor : single;
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procedure CreateSyncObj;
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procedure DestroySyncObj;
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procedure DestroyBuffer;
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function GetScreenScale : single; virtual;
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function GetBufferWidth : integer;
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function GetBufferHeight : integer;
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function GetParentForm : TCustomForm;
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function GetParentFormHandle : TCefWindowHandle;
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function GetRealScreenScale(var aResultScale : single) : boolean; virtual;
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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 DialogKey(var Key: Word; Shift: TShiftState); override;
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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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/// <summary>
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/// Save the visible web contents as a bitmap file.
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/// </summary>
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function SaveToFile(const aFilename : string) : boolean;
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/// <summary>
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/// Invalidate this panel.
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/// </summary>
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procedure InvalidatePanel;
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/// <summary>
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/// Acquires the synchronization object before drawing into the background bitmap.
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/// </summary>
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function BeginBufferDraw : boolean;
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/// <summary>
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/// Releases the synchronization object after drawing into the background bitmap.
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/// </summary>
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procedure EndBufferDraw;
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/// <summary>
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/// Draws a part of aBitmap into the background bitmap buffer at the specified rectangle.
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/// </summary>
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/// <param name="aBitmap">Bitmap that will be drawn into the background bitmap.</param>
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/// <param name="aSrcRect">Rectangle that defines the area of aBitmap that will be drawn into the background bitmap.</param>
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/// <param name="aDstRect">Rectangle that defines the area of the background bitmap where aBitmap will be drawn.</param>
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procedure BufferDraw(const aBitmap : TBitmap; const aSrcRect, aDstRect : TRectF);
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/// <summary>
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/// Update the background bitmap size.
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/// </summary>
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function UpdateBufferDimensions(aWidth, aHeight : integer) : boolean;
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/// <summary>
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/// Check if the background image buffers have the same dimensions as this panel. Returns true if they have the same size.
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/// </summary>
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function BufferIsResized(aUseMutex : boolean = True) : boolean;
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/// <summary>
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/// Convert a point from the screen coordinate system to the client coordinate system.
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/// </summary>
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function ScreenToClient(aPoint : TPoint) : TPoint; overload;
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/// <summary>
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/// Convert a point from the screen coordinate system to the client coordinate system.
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/// </summary>
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function ScreenToClient(aPoint : TPointF) : TPointF; overload;
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/// <summary>
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/// Convert a point from the client coordinate system to the screen coordinate system.
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/// </summary>
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function ClientToScreen(aPoint : TPoint) : TPoint; overload;
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/// <summary>
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/// Convert a point from the client coordinate system to the screen coordinate system.
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/// </summary>
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function ClientToScreen(aPoint : TPointF) : TPointF; overload;
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/// <summary>
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/// Background bitmap.
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/// </summary>
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property Buffer : TBitmap read FBuffer;
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/// <summary>
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/// Returns the scanline size.
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/// </summary>
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property ScanlineSize : integer read FScanlineSize;
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/// <summary>
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/// Image width.
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/// </summary>
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property BufferWidth : integer read GetBufferWidth;
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/// <summary>
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/// Image height.
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/// </summary>
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property BufferHeight : integer read GetBufferHeight;
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/// <summary>
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/// Returns the screen scale.
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/// </summary>
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property ScreenScale : single read GetScreenScale;
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/// <summary>
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/// Screen scale value used instead of the real one.
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/// </summary>
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property ForcedDeviceScaleFactor : single read FForcedDeviceScaleFactor write FForcedDeviceScaleFactor;
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published
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property Align;
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property Anchors;
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property Visible;
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property Enabled;
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property TabOrder;
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/// <summary>
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/// Color used to clear the panel canvas in the Paint method.
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/// </summary>
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property Color : TAlphaColor read FColor write FColor default claWhite;
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/// <summary>
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/// Set HighSpeedDrawing to True to draw the buffer to the canvas using a high speed interpolation mode.
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/// </summary>
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property HighSpeedDrawing : boolean read FHighSpeedDrawing write FHighSpeedDrawing default True;
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{$IFDEF DELPHI17_UP}
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property CanFocus;
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property CanParentFocus;
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property Height;
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property Width;
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property Padding;
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property Opacity;
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property Margins;
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property Position;
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property RotationAngle;
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property RotationCenter;
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property Scale;
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{$ENDIF}
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{$IFDEF DELPHI18_UP}
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property TabStop;
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{$ENDIF}
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{$IFDEF DELPHI21_UP}
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property Size;
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{$ENDIF}
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{$IFDEF DELPHI25_UP}
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property OnResized;
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{$ENDIF}
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{$IFNDEF DELPHI23_UP}
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property Hint;
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property ShowHint;
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{$ENDIF}
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property OnEnter;
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property OnExit;
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property OnResize;
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property OnClick;
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property OnMouseDown;
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property OnMouseMove;
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property OnMouseUp;
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property OnMouseEnter;
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property OnMouseLeave;
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property OnMouseWheel;
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property OnKeyUp;
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property OnKeyDown;
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/// <summary>
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/// Event triggered before the DialogKey.
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/// </summary>
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property OnDialogKey : TDialogKeyEvent read FOnDialogKey write FOnDialogKey;
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end;
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implementation
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uses
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System.SysUtils, System.Math,
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{$IFDEF MSWINDOWS}{$IFDEF DELPHI24_UP}FMX.Helpers.Win,{$ENDIF}{$ENDIF}
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FMX.Platform, {$IFDEF MACOS}FMX.Platform.Mac,{$ENDIF}
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uCEFMiscFunctions, uCEFApplicationCore;
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constructor TFMXBufferPanel.Create(AOwner: TComponent);
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begin
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inherited Create(AOwner);
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{$IFDEF MSWINDOWS}
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FMutex := 0;
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{$ELSE}
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FBufferCS := nil;
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{$ENDIF}
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FBuffer := nil;
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FScanlineSize := 0;
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FColor := claWhite;
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FOnDialogKey := nil;
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FHighSpeedDrawing := True;
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if (GlobalCEFApp <> nil) and (GlobalCEFApp.ForcedDeviceScaleFactor <> 0) then
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FForcedDeviceScaleFactor := GlobalCEFApp.ForcedDeviceScaleFactor
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else
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FForcedDeviceScaleFactor := 0;
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end;
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destructor TFMXBufferPanel.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 TFMXBufferPanel.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 TFMXBufferPanel.CreateSyncObj;
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begin
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{$IFDEF MSWINDOWS}
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FMutex := CreateMutex(nil, False, nil);
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{$ELSE}
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FBufferCS := TCriticalSection.Create;
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{$ENDIF}
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end;
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procedure TFMXBufferPanel.DestroySyncObj;
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begin
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{$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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{$ELSE}
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if (FBufferCS <> nil) then FreeAndNil(FBufferCS);
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{$ENDIF}
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end;
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procedure TFMXBufferPanel.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 TFMXBufferPanel.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('TFMXBufferPanel.SaveBufferToFile', e) then raise;
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end;
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end;
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function TFMXBufferPanel.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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procedure TFMXBufferPanel.InvalidatePanel;
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begin
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InvalidateRect(TRectF.Create(0, 0, Width, Height));
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end;
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function TFMXBufferPanel.BeginBufferDraw : boolean;
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begin
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{$IFDEF MSWINDOWS}
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Result := (FMutex <> 0) and (WaitForSingleObject(FMutex, 5000) = WAIT_OBJECT_0);
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{$ELSE}
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if (FBufferCS <> nil) then
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begin
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FBufferCS.Acquire;
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Result := True;
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end
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else
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Result := False;
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{$ENDIF}
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end;
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procedure TFMXBufferPanel.EndBufferDraw;
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begin
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{$IFDEF MSWINDOWS}
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if (FMutex <> 0) then ReleaseMutex(FMutex);
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{$ELSE}
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if (FBufferCS <> nil) then FBufferCS.Release;
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{$ENDIF}
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end;
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function TFMXBufferPanel.CopyBuffer : boolean;
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var
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TempSrc, TempDst, TempClip : TRectF;
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TempState : TCanvasSaveState;
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TempScale : single;
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begin
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Result := False;
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if Canvas.BeginScene then
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try
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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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TempScale := ScreenScale;
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TempSrc := TRectF.Create(0, 0, FBuffer.Width, FBuffer.Height);
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TempDst := TRectF.Create(0, 0, FBuffer.Width / TempScale, FBuffer.Height / TempScale);
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TempClip := TRectF.Create(0, 0, Width, Height);
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TempState := Canvas.SaveState;
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try
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Canvas.IntersectClipRect(TempClip);
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Canvas.DrawBitmap(FBuffer, TempSrc, TempDst, 1, FHighSpeedDrawing);
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Result := True;
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finally
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Canvas.RestoreState(TempState);
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end;
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end;
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finally
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EndBufferDraw;
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end;
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finally
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Canvas.EndScene;
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end;
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end;
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procedure TFMXBufferPanel.DialogKey(var Key: Word; Shift: TShiftState);
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begin
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if assigned(FOnDialogKey) then FOnDialogKey(self, Key, Shift);
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inherited DialogKey(Key, Shift);
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end;
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procedure TFMXBufferPanel.Paint;
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var
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TempRect : TRectF;
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begin
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if (csDesigning in ComponentState) or not(CopyBuffer) then
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begin
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TempRect := TRectF.Create(0, 0, Width, Height);
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if Canvas.BeginScene then
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try
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Canvas.ClearRect(TempRect, FColor);
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finally
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Canvas.EndScene;
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end;
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end;
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end;
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function TFMXBufferPanel.GetParentForm : TCustomForm;
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var
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TempComp : TComponent;
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begin
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Result := nil;
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TempComp := Owner;
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while (TempComp <> nil) do
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if (TempComp is TCustomForm) then
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begin
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Result := TCustomForm(TempComp);
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exit;
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end
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else
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TempComp := TempComp.owner;
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end;
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function TFMXBufferPanel.GetParentFormHandle : TCefWindowHandle;
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{$IFDEF MSWINDOWS}
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var
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TempForm : TCustomForm;
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{$ENDIF}
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begin
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InitializeWindowHandle(Result);
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{$IFDEF MSWINDOWS}
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TempForm := GetParentForm;
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if (TempForm <> nil) then
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Result := FmxHandleToHWND(TempForm.Handle)
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else
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if (Application <> nil) and
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(Application.MainForm <> nil) then
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Result := FmxHandleToHWND(Application.MainForm.Handle);
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{$ENDIF}
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end;
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function TFMXBufferPanel.GetRealScreenScale(var aResultScale : single) : boolean;
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{$IFDEF DELPHI24_UP}{$IFDEF MSWINDOWS}
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var
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TempHandle : TCefWindowHandle;
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{$ENDIF}{$ENDIF}
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begin
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{$IFDEF MSWINDOWS}
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{$IFDEF DELPHI24_UP}
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TempHandle := GetParentFormHandle;
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if (TempHandle <> 0) then
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begin
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Result := True;
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aResultScale := GetWndScale(TempHandle);
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end
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else
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begin
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Result := False;
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aResultScale := 1;
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end;
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{$ELSE}
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Result := False;
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aResultScale := 1;
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{$ENDIF}
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{$ENDIF}
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{$IFDEF LINUX}
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if (Screen.DisplayCount = 1) then
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aResultScale := Screen.Displays[0].Scale
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else
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aResultScale := Screen.DisplayFromForm(GetParentForm).Scale;
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Result := True;
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{$ENDIF}
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{$IFDEF MACOS}
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Result := True;
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aResultScale := TMacWindowHandle(GetParentForm.Handle).Wnd.backingScaleFactor;
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{$ENDIF}
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end;
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function TFMXBufferPanel.GetScreenScale : single;
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var
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TempScale : single;
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begin
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if (FForcedDeviceScaleFactor <> 0) then
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Result := FForcedDeviceScaleFactor
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else
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if GetRealScreenScale(TempScale) then
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Result := TempScale
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else
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if (GlobalCEFApp <> nil) then
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Result := GlobalCEFApp.DeviceScaleFactor
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else
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Result := 1;
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end;
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function TFMXBufferPanel.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 TFMXBufferPanel.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 TFMXBufferPanel.BufferDraw(const aBitmap : TBitmap; const aSrcRect, aDstRect : TRectF);
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begin
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if (FBuffer <> nil) then
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if FBuffer.Canvas.BeginScene then
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try
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FBuffer.Canvas.DrawBitmap(aBitmap, aSrcRect, aDstRect, 1, FHighSpeedDrawing);
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finally
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FBuffer.Canvas.EndScene;
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end;
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end;
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function TFMXBufferPanel.UpdateBufferDimensions(aWidth, aHeight : integer) : boolean;
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{$IFDEF DELPHI18_UP}
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var
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TempScale : single;
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{$ENDIF}
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begin
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Result := False;
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{$IFDEF DELPHI18_UP}
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TempScale := ScreenScale;
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{$ENDIF}
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if ((FBuffer = nil) or
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{$IFDEF DELPHI18_UP}
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(FBuffer.BitmapScale <> TempScale) or
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{$ENDIF}
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(FBuffer.Width <> aWidth) or
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(FBuffer.Height <> aHeight)) then
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begin
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if (FBuffer <> nil) then FreeAndNil(FBuffer);
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FBuffer := TBitmap.Create(aWidth, aHeight);
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{$IFDEF DELPHI18_UP}
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FBuffer.BitmapScale := TempScale;
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FScanlineSize := FBuffer.BytesPerLine;
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{$ELSE}
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FScanlineSize := aWidth * SizeOf(TRGBQuad);
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{$ENDIF}
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Result := True;
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end;
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end;
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function TFMXBufferPanel.BufferIsResized(aUseMutex : boolean) : boolean;
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var
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TempWidth, TempHeight : integer;
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TempScale : single;
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begin
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Result := False;
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if not(aUseMutex) or BeginBufferDraw then
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begin
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TempScale := ScreenScale;
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TempWidth := round(Width * TempScale);
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TempHeight := round(Height * TempScale);
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Result := (FBuffer <> nil) and
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{$IFDEF DELPHI18_UP}
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(FBuffer.BitmapScale = TempScale) and
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{$ENDIF}
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(FBuffer.Width = TempWidth) and
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(FBuffer.Height = TempHeight);
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if aUseMutex then EndBufferDraw;
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end;
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end;
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function TFMXBufferPanel.ScreenToClient(aPoint : TPoint) : TPoint;
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var
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TempPoint : TPointF;
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begin
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TempPoint.x := aPoint.x;
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TempPoint.y := aPoint.y;
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TempPoint := ScreenToLocal(TempPoint);
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Result.x := round(TempPoint.x);
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Result.y := round(TempPoint.y);
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end;
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function TFMXBufferPanel.ScreenToClient(aPoint : TPointF) : TPointF;
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begin
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Result := ScreenToLocal(aPoint);
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end;
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function TFMXBufferPanel.ClientToScreen(aPoint : TPoint) : TPoint;
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var
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TempPoint : TPointF;
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begin
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TempPoint.x := aPoint.x;
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TempPoint.y := aPoint.y;
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TempPoint := LocalToScreen(TempPoint);
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Result.x := round(TempPoint.x);
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Result.y := round(TempPoint.y);
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end;
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function TFMXBufferPanel.ClientToScreen(aPoint : TPointF) : TPointF;
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begin
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Result := LocalToScreen(aPoint);
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end;
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|
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end.
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