Componentes.Terceros.jvcl/official/3.39/examples/JvDBExplorer/EDITPICT.PAS

{******************************************************************

                       JEDI-VCL Demo

 Copyright (C) 2002 Project JEDI

 Original author:

 Contributor(s):

 You may retrieve the latest version of this file at the JEDI-JVCL
 home page, located at http://jvcl.delphi-jedi.org

 The contents of this file are used with permission, subject to
 the Mozilla Public License Version 1.1 (the "License"); you may
 not use this file except in compliance with the License. You may
 obtain a copy of the License at
 http://www.mozilla.org/MPL/MPL-1_1Final.html

 Software distributed under the License is distributed on an
 "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
 implied. See the License for the specific language governing
 rights and limitations under the License.

******************************************************************}

{*******************************************************}
{                                                       }
{     Delphi VCL Extensions (RX) demo program           }
{                                                       }
{     Copyright (c) 1996 AO ROSNO                       }
{     Copyright (c) 1997 Master-Bank                    }
{                                                       }
{*******************************************************}

unit EditPict;

{$I jvcl.inc}

interface

uses WinTypes, WinProcs, Classes, Graphics, Forms, Controls, Buttons, Dialogs,
  StdCtrls, ExtCtrls, DBCtrls, DB, Menus,
  ExtDlgs, ComCtrls, JvComponent, JvFormPlacement;

type
  TPictEditDlg = class(TForm)
    OkBtn: TBitBtn;
    CancelBtn: TBitBtn;
    LoadBtn: TBitBtn;
    Bevel: TBevel;
    SaveBtn: TBitBtn;
    DataSource: TDataSource;
    DBNavigator: TDBNavigator;
    StretchBox: TCheckBox;
    PopupMenu: TPopupMenu;
    Cut1: TMenuItem;
    Copy1: TMenuItem;
    Paste1: TMenuItem;
    Clear1: TMenuItem;
    N1: TMenuItem;
    DBImage: TDBImage;
    procedure FileOpen(Sender: TObject);
    procedure ImageKeyDown(Sender: TObject; var Key: Word;
      Shift: TShiftState);
    procedure SaveBtnClick(Sender: TObject);
    procedure OkBtnClick(Sender: TObject);
    procedure StretchBoxClick(Sender: TObject);
    procedure MenuClick(Sender: TObject);
    procedure FormCreate(Sender: TObject);
  private
{$IFDEF COMPILER3_UP}
    OpenDialog: TOpenPictureDialog;
    SaveDialog: TSavePictureDialog;
{$ELSE}
    OpenDialog: TOpenDialog;
    SaveDialog: TSaveDialog;
{$ENDIF}
    procedure UpdatePictureField;
  end;

function PictureEdit(DataSet: TDataSet; const FieldName: string): Boolean;

implementation

{$R *.DFM}

uses Messages, SysUtils {$IFDEF USE_Jv_GIF}, JvGIF {$ENDIF}
  {$IFDEF COMPILER3_UP} {$IFNDEF BCB}, Jpeg {$ENDIF} {$ENDIF};

function PictureEdit(DataSet: TDataSet; const FieldName: string): Boolean;
begin
  with TPictEditDlg.Create(Application) do
  try
    DataSource.DataSet := DataSet;
    DBImage.DataField := FieldName;
    ActiveControl := DBImage;
    Caption := Format('Field: %s', [FieldName]);
    Result := (ShowModal = mrOk);
  finally
    Free;
  end;
end;

{ TPictEditDlg }

procedure TPictEditDlg.UpdatePictureField;
var
  Tmp: TBitmap;
begin
  if (DBImage.Picture.Graphic <> nil) and
    not (DBImage.Picture.Graphic.Empty) then
  begin
    if not (DBImage.Picture.Graphic is TBitmap) then begin
      Tmp := TBitmap.Create;
      try
        Tmp.Assign(DBImage.Picture.Graphic);
        DBImage.Picture.Assign(Tmp);
      finally
        Tmp.Free;
      end;
    end;
  end;
end;

procedure TPictEditDlg.FileOpen(Sender: TObject);
begin
  with OpenDialog do begin
    DefaultExt := 'BMP';
    Filter := GraphicFilter(TGraphic);
    if Execute then begin
      if DataSource.AutoEdit then DataSource.Edit;
      DBImage.Picture.LoadFromFile(FileName);
      UpdatePictureField;
    end;
  end;
end;

procedure TPictEditDlg.ImageKeyDown(Sender: TObject; var Key: Word;
  Shift: TShiftState);
begin
  {if Key = VK_ESCAPE then CancelBtn.Click;}
end;

procedure TPictEditDlg.SaveBtnClick(Sender: TObject);
begin
  with SaveDialog do begin
    if (DBImage.Picture.Graphic <> nil) and
      not (DBImage.Picture.Graphic.Empty) then
    begin
      DefaultExt := GraphicExtension(TGraphicClass(DBImage.Picture.Graphic.ClassType));
      Filter := GraphicFilter(TGraphicClass(DBImage.Picture.Graphic.ClassType));
    end
    else begin
      DefaultExt := 'BMP';
      Filter := GraphicFilter(TGraphic);
    end;
    if Execute then DBImage.Picture.SaveToFile(FileName);
  end;
end;

procedure TPictEditDlg.OkBtnClick(Sender: TObject);
begin
  UpdatePictureField;
  ModalResult := mrOk;
end;

procedure TPictEditDlg.StretchBoxClick(Sender: TObject);
begin
  DBImage.Stretch := StretchBox.Checked;
end;

procedure TPictEditDlg.MenuClick(Sender: TObject);
begin
  case Integer(TMenuItem(Sender).Tag) of
    1: DBImage.Perform(WM_CUT, 0, 0);
    2: DBImage.Perform(WM_COPY, 0, 0);
    3: DBImage.Perform(WM_PASTE, 0, 0);
    4: begin
         if DataSource.AutoEdit then DataSource.Edit;
         DBImage.Picture.Graphic := nil;
         UpdatePictureField;
       end;
  end;
end;

procedure TPictEditDlg.FormCreate(Sender: TObject);
begin
{$IFDEF COMPILER3_UP}
  OpenDialog := TOpenPictureDialog.Create(Self);
  SaveDialog := TSavePictureDialog.Create(Self);
{$ELSE}
  OpenDialog := TOpenDialog.Create(Self);
  SaveDialog := TSaveDialog.Create(Self);
{$ENDIF}
  with OpenDialog do begin
    Title := 'Load picture';
    Options := [ofHideReadOnly, ofFileMustExist, ofShowHelp];
  end;
  with SaveDialog do begin
    Title := 'Save picture as';
    Options := [ofHideReadOnly, ofFileMustExist, ofShowHelp,
      ofOverwritePrompt];
  end;
end;

end.