Komponente (TImage & TLabel) -> Image wird nicht angezeigt

[NoGAD]

Hallo an alle.

Danke für eure Hilfen.

Inzwischen habe ich meine Komponente erweitert und bin zufrieden damit

Delphi-Quellcode:

unit TRM_ImageLabel;

(*

  TRM_ImageLabel erstellt von Mathias Fiege 2024

  www.nogad.de

  Open Source License
  Permission is hereby granted, free of charge, to any person obtaining a copy
  of this software component and associated documentation files (the "Software"),
  to deal in the Software without restriction, including without limitation the
  rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
  sell copies of the Software, and to permit persons to whom the Software is
  furnished to do so, subject to the following conditions:

  The above copyright notice and this permission notice shall be included in all
  copies or substantial portions of the Software.

  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  THE SOFTWARE.

  Thanks and greetings to www.delphipraxis.net

*)

interface


uses
  System.Classes,
  Vcl.Controls,
  Vcl.ExtCtrls,
  Vcl.Forms,
  Vcl.Imaging.GIFConsts,
  Vcl.Imaging.GIFImg,
  Vcl.Imaging.JConsts,
  Vcl.Imaging.jpeg,
  Vcl.Imaging.pngimage,
  Vcl.Imaging.pnglang,
  Vcl.StdCtrls,
  Vcl.Graphics;

const
  _version = '2024.05.19.0015';

type

  TTRM_ImageLabel = class(TCustomPanel)
  private
    FSubImage: TImage;
    FSubImageAlign: TAlign;

    FSubLabel: TLabel;
    FSubLabelCaption: String;
    FSubLabelAlign: TAlign;

    FPictureDefault: TPicture;
    FPictureHover: TPicture;
    FPictureLeave: TPicture;

    FHoverLeaveLabel: Boolean;
    FHoverLeaveImage: Boolean;

    FVersion: String;

    function GetSubImageAlign: TAlign;
    procedure SetSubImageAlign(Value: TAlign);

    function GetPictureDefault: TPicture;
    procedure SetPictureDefault(Value: TPicture);
    procedure ChangePictureDefault(Sender: TObject);
    function GetPictureHover: TPicture;
    procedure SetPictureHover(Value: TPicture);
    function GetPictureLeave: TPicture;
    procedure SetPictureLeave(Value: TPicture);

    function GetLabelCaption: String;
    procedure SetLabelCaption(const Value: String);
    function GetSubLabelAlign: TAlign;
    procedure SetSubLabelAlign(Value: TAlign);

    procedure ImageClick(Sender: TObject);
    procedure ImageDblClick(Sender: TObject);
    procedure ImageMouseEnter(Sender: TObject);
    procedure ImageMouseLeave(Sender: TObject);

    procedure LabelClick(Sender: TObject);
    procedure LabelDblClick(Sender: TObject);
    procedure LabelMouseEnter(Sender: TObject);
    procedure LabelMouseLeave(Sender: TObject);

  protected
  public
    constructor Create(AOwner: TComponent); override;
    destructor Destroy; override;

  published
    property SubImage: TImage read FSubImage;
    property SubLabel: TLabel read FSubLabel;

    property Align;
    property Anchors;
    property BevelInner;
    property BevelKind;
    property BevelOuter;
    property BevelWidth;
    property BorderWidth;
    property BorderStyle;
    property Caption;
    property Ctl3D;
    property Cursor;
    property ParentBackground;
    property PopupMenu;

    property OnClick;
    property OnDblClick;
    property OnMouseEnter;
    property OnMouseLeave;

    property PictureDefault: TPicture read GetPictureDefault write SetPictureDefault;
    property PictureHover: TPicture read GetPictureHover write SetPictureHover;
    property PictureLeave: TPicture read GetPictureLeave write SetPictureLeave;

    property HoverLeaveLabel: Boolean read FHoverLeaveLabel write FHoverLeaveLabel default True;
    property HoverLeaveImage: Boolean read FHoverLeaveImage write FHoverLeaveImage default True;

    property ImageAlign: TAlign read GetSubImageAlign write SetSubImageAlign default alClient;

    property LabelCaption: String read GetLabelCaption write SetLabelCaption;
    property LabelAlign: TAlign read GetSubLabelAlign write SetSubLabelAlign default alBottom;

    property Version: String read FVersion;

  end;

procedure Register;

implementation

procedure Register;
begin
  RegisterComponents('TRM', [TTRM_ImageLabel]);
end;

{ TTRM_ImageLabel }

constructor TTRM_ImageLabel.Create(AOwner: TComponent);
begin
  inherited Create(AOwner);
  Self.Parent := TWinControl(AOwner);

  FSubImage := TImage.Create(Self);
  FSubImage.SetSubComponent(True);
  FSubImage.Parent := Self;
  // FSubImage.Align := alClient;
  FSubImage.Center := True;
  FSubImage.OnClick := ImageClick;
  FSubImage.OnDblClick := ImageDblClick;
  FSubImage.OnMouseEnter := ImageMouseEnter;
  FSubImage.OnMouseLeave := ImageMouseLeave;

  FSubLabel := TLabel.Create(Self);
  FSubLabel.SetSubComponent(True);
  FSubLabel.Parent := Self;
  // FSubLabel.Align := alBottom;
  FSubLabel.AutoSize := True;
  FSubLabel.Height := 25;
  FSubLabel.AlignWithMargins := False;
  FSubLabel.Margins.Left := 0;
  FSubLabel.Margins.Right := 0;
  FSubLabel.Margins.Top := 8;
  FSubLabel.Margins.Bottom := 0;
  FSubLabel.Caption := '...';
  FSubLabel.Font.Size := 14;
  FSubLabel.OnClick := LabelClick;
  FSubLabel.OnDblClick := LabelDblClick;
  FSubLabel.OnMouseEnter := LabelMouseEnter;
  FSubLabel.OnMouseLeave := LabelMouseLeave;

  FPictureDefault := TPicture.Create;
  FPictureDefault.OnChange := ChangePictureDefault;
  FPictureHover := TPicture.Create;
  FPictureLeave := TPicture.Create;

  Self.Width := 64;
  Self.Height := 89;
  Self.AlignWithMargins := True;
  Self.Margins.Top := 0;
  Self.Margins.Left := 8;
  Self.Margins.Right := 8;
  Self.Margins.Bottom := 0;
  Self.BevelInner := bvNone;
  Self.BevelKind := bkNone;
  Self.BevelOuter := bvNone;
  Self.BevelWidth := 1;
  Self.BorderStyle := bsNone;
  Self.BorderWidth := 0;
  Self.Caption := '';
  Self.Ctl3D := False;
  Self.Cursor := crHandPoint;
  Self.ParentBackground := True;

  HoverLeaveLabel := True;
  HoverLeaveImage := True;

  ImageAlign := alClient;

  LabelAlign := alBottom;

  FVersion := _version;

end;

function TTRM_ImageLabel.GetSubImageAlign: TAlign;
begin
  Result := FSubImageAlign;
  FSubImage.Align := FSubImageAlign;
  Repaint;

end;

procedure TTRM_ImageLabel.SetSubImageAlign(Value: TAlign);
begin
  if FSubImageAlign <> Value then
  begin
    FSubImageAlign := Value;
    FSubImage.Align := FSubImageAlign;
    Repaint;
  end;

end;

function TTRM_ImageLabel.GetPictureDefault: TPicture;
begin
  Result := FPictureDefault;
  FSubImage.Picture.Assign(FPictureDefault);
  Repaint;

end;

procedure TTRM_ImageLabel.SetPictureDefault(Value: TPicture);
begin
  if FPictureDefault <> Value then
  begin
    FPictureDefault.Assign(Value);
    FSubImage.Picture.Assign(FPictureDefault);
    Repaint;
  end;

end;

procedure TTRM_ImageLabel.ChangePictureDefault(Sender: TObject);
begin
  FSubImage.Picture.Assign(FPictureDefault);
  Repaint;

end;

function TTRM_ImageLabel.GetPictureHover: TPicture;
begin
  Result := FPictureHover;

end;

procedure TTRM_ImageLabel.SetPictureHover(Value: TPicture);
begin
  if FPictureHover <> Value then
    FPictureHover.Assign(Value);

end;

function TTRM_ImageLabel.GetPictureLeave: TPicture;
begin
  Result := FPictureLeave;

end;

procedure TTRM_ImageLabel.SetPictureLeave(Value: TPicture);
begin
  if FPictureLeave <> Value then
    FPictureLeave.Assign(Value);

end;

function TTRM_ImageLabel.GetLabelCaption: String;
begin
  if FSubLabelCaption = '' then
    Result := SubLabel.Caption
  else
    Result := FSubLabelCaption;

  Repaint;

end;

procedure TTRM_ImageLabel.SetLabelCaption(const Value: string);
begin
  if FSubLabelCaption <> Value then
  begin
    FSubLabelCaption := Value;
    Self.SubLabel.Caption := FSubLabelCaption;
    Repaint;
  end;

end;

function TTRM_ImageLabel.GetSubLabelAlign: TAlign;
begin
  Result := FSubLabelAlign;
  FSubLabel.Align := FSubLabelAlign;
  Repaint;

end;

procedure TTRM_ImageLabel.SetSubLabelAlign(Value: TAlign);
begin
  if FSubLabelAlign <> Value then
  begin
    FSubLabelAlign := Value;
    FSubLabel.Align := FSubLabelAlign;
    Repaint;
  end;

end;

procedure TTRM_ImageLabel.ImageClick(Sender: TObject);
begin
  if assigned(OnClick) then
    inherited OnClick(Self);

end;

procedure TTRM_ImageLabel.ImageDblClick(Sender: TObject);
begin
  if assigned(OnDblClick) then
    inherited OnDblClick(Self);

end;

procedure TTRM_ImageLabel.ImageMouseEnter(Sender: TObject);
begin
  if HoverLeaveImage then
  begin
    Self.SubImage.Picture.Assign(FPictureHover);
    Repaint;
  end;
  if assigned(OnMouseEnter) then
    inherited OnMouseEnter(Self);

end;

procedure TTRM_ImageLabel.ImageMouseLeave(Sender: TObject);
begin
  if HoverLeaveImage then
  begin
    Self.SubImage.Picture.Assign(FPictureLeave);
    Repaint;
  end;
  if assigned(OnMouseLeave) then
    inherited OnMouseLeave(Self);
end;

procedure TTRM_ImageLabel.LabelClick(Sender: TObject);
begin
  if assigned(OnClick) then
    inherited OnClick(Self);

end;

procedure TTRM_ImageLabel.LabelDblClick(Sender: TObject);
begin
  if assigned(OnDblClick) then
    inherited OnDblClick(Self);

end;

procedure TTRM_ImageLabel.LabelMouseEnter(Sender: TObject);
begin
  if FHoverLeaveLabel then
  begin
    Self.SubImage.Picture.Assign(FPictureHover);
    Repaint;
  end;
  if assigned(OnMouseEnter) then
    inherited OnMouseEnter(Self);

end;

procedure TTRM_ImageLabel.LabelMouseLeave(Sender: TObject);
begin
  if FHoverLeaveLabel then
  begin
    Self.SubImage.Picture.Assign(FPictureLeave);
    Repaint;
  end;
  if assigned(OnMouseLeave) then
    inherited OnMouseLeave(Self);

end;

destructor TTRM_ImageLabel.Destroy;
begin
  FSubImage.Free;
  FSubLabel.Free;

  FPictureDefault.Free;
  FPictureHover.Free;
  FPictureLeave.Free;

  inherited Destroy;

end;

end.

LG und ein schönes langes Wochenende
~Mathias