NSImage

[CHackbart]

Auf MacOS kannst du NSImageView nutzen. Das ist relativ einfach und du hast keine Huddelei mit nativen Elementen. Auf IOS und Android bzw. unter Windows geht das denke ich ähnlich. Ich wüsste auch gerne, wie man das möglichst Elegant und großen Codeaufwand beheben kann.

Delphi-Quellcode:

unit UOSD;

interface

uses System.Types, System.Classes, FMX.Graphics, FMX.Controls
    {$IFDEF MACOS}
     , Macapi.AppKit
    {$ENDIF};

type
  TOSD = class(TControl)
  protected
    FBitmap: TBitmap;
    FNativePaint: Boolean;
    FNeedUpdate: Boolean;
{$IFDEF MACOS}
    FOverlayView: NSImageView;
{$ENDIF}
    procedure Paint; override;
    procedure Resize; override;
    procedure SetBitmap(const ABitmap: TBitmap);
    procedure SetNativePaint(const ANativePaint: Boolean);
  public
    constructor Create(AOwner: TComponent); override;
    destructor Destroy; override;
  published
    property Bitmap: TBitmap read FBitmap write SetBitmap;
    property Opacity;
    property NativePaint: Boolean read FNativePaint write SetNativePaint
      default false;
  end;

implementation

uses FMX.Types, FMX.Forms
{$IFDEF MACOS}, FMX.Platform.Mac, FMX.Helpers.Mac, Macapi.CocoaTypes, Macapi.CoreGraphics {$ENDIF};

function GetParentForm(Control: TFmxObject): TCommonCustomForm;
begin
  if (Control.Root <> nil) and (Control.Root.GetObject is TCommonCustomForm)
  then
    Result := TCommonCustomForm(Control.Root.GetObject)
  else
    Result := nil;
end;

constructor TOSD.Create(AOwner: TComponent);
begin
  inherited;
  Width := 100;
  Height := 100;
  FBitmap := TBitmap.Create;
end;

destructor TOSD.Destroy;
begin
  FBitmap.free;
  inherited;
end;

procedure TOSD.SetNativePaint(const ANativePaint: Boolean);
begin
  if FNativePaint <> ANativePaint then
  begin
    FNativePaint := ANativePaint;
{$IFDEF MACOS}
    if assigned(FOverlayView) then
      FOverlayView.release;
    FNeedUpdate := true;
{$ENDIF}
    Repaint;
  end;
end;

procedure TOSD.SetBitmap(const ABitmap: TBitmap);
begin
  FBitmap.Assign(ABitmap);
  FNeedUpdate := true;
  Repaint;
end;

procedure TOSD.Resize;
{$IFDEF MACOS}
var
  R: TRectF;
{$ENDIF}
begin
  inherited;
{$IFDEF MACOS}
  if assigned(FOverlayView) then
  begin
    R := GetAbsoluteRect;
    FOverlayView.setFrame(MakeNSRect(R.Left, R.Top, R.Width, R.Height));
  end;
{$ENDIF}
end;

procedure TOSD.Paint;
var
  DstRect: TRectF;
{$IFDEF MACOS}
  FormView: NSView;
  Form: TCommonCustomForm;
  R: TRectF;
{$ENDIF}
begin
{$IFDEF MACOS}
  if FNativePaint then
  begin
    if FNeedUpdate then
    begin
      if not assigned(FOverlayView) then
      begin
        R := BoundsRect;

        FOverlayView := TNSImageView.Wrap
          (TNSImageView.Alloc.initWithFrame(MakeNSRect(R.Left, R.Top, R.Width,
          R.Height)));
        FOverlayView.retain;

        Form := GetParentForm(self);

        if assigned(Form) then
        begin
          FormView := TNSView.Wrap(WindowHandleToPlatform(Form.Handle)
            .Wnd.contentView);
          FormView.addSubview(FOverlayView, NSWindowAbove, nil);
        end;
        FOverlayView.setWantsLayer(true);
        FOverlayView.setFrame(MakeNSRect(R.Left, R.Top, R.Width, R.Height));
      end;
      FOverlayView.setImage(BitmapToMacBitmap(FBitmap));
      FNeedUpdate := false;
    end;
    exit;
  end;
{$ENDIF}
  DstRect := FBitmap.BoundsF;
  DstRect.Fit(BoundsRect);
  Canvas.DrawBitmap(FBitmap, FBitmap.BoundsF, DstRect, Opacity)
end;

end.