Componentes.Terceros.jvcl/official/3.39/examples/JvDBExplorer/USERHELP.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) 1997 Master-Bank                    }
{                                                       }
{*******************************************************}

unit UserHelp;

interface

uses
  SysUtils, WinTypes, WinProcs, Messages, Classes, Graphics, Controls,
  Forms, Dialogs, StdCtrls, Grids, Mask, JvComponent, JvFormPlacement,
  JvGrids, JvToolEdit, JvExGrids, JvExMask;

type
  TCustomizeHelpDlg = class(TForm)
    Label1: TLabel;
    FormStorage: TJvFormStorage;
    FileName: TJvFilenameEdit;
    Label2: TLabel;
    HelpList: TJvDrawGrid;
    OkBtn: TButton;
    CancelBtn: TButton;
    procedure FormCreate(Sender: TObject);
    procedure FormDestroy(Sender: TObject);
    procedure HelpListGetEditText(Sender: TObject; ACol, ARow: Longint;
      var Value: string);
    procedure HelpListSelectCell(Sender: TObject; Col, Row: Longint;
      var CanSelect: Boolean);
    procedure HelpListDrawCell(Sender: TObject; Col, Row: Longint;
      Rect: TRect; State: TGridDrawState);
    procedure HelpListSetEditText(Sender: TObject; ACol, ARow: Longint;
      const Value: string);
    procedure FileNameChange(Sender: TObject);
    procedure OkBtnClick(Sender: TObject);
    procedure HelpListKeyDown(Sender: TObject; var Key: Word;
      Shift: TShiftState);
    procedure HelpListGetEditLimit(Sender: TObject;
      var MaxLength: Integer);
    procedure HelpListRowMoved(Sender: TObject; FromIndex,
      ToIndex: Longint);
  private
    { Private declarations }
    FHelpList: TStrings;
    FEditChanged: Boolean;
    function ApplyEditChanges: Boolean;
  protected
{$IFNDEF WIN32}
    procedure CreateParams(var Params: TCreateParams); override;
{$ENDIF}
  public
    { Public declarations }
  end;

procedure CustomizeHelp(UserHelpList: TStrings);

implementation

uses JvJCLUtils;

{$R *.DFM}

procedure CustomizeHelp(UserHelpList: TStrings);
var
  CanSelect: Boolean;
begin
  with TCustomizeHelpDlg.Create(Application) do
  try
    FHelpList.Assign(UserHelpList);
    HelpList.RowCount := FHelpList.Count + 1;
    HelpList.Row := 0;
    HelpListSelectCell(HelpList, 1, 0, CanSelect);
    if ShowModal = mrOk then UserHelpList.Assign(FHelpList);
  finally
    Free;
  end;
end;

{ TCustomizeHelpDlg }

{$IFNDEF WIN32}

procedure TCustomizeHelpDlg.CreateParams(var Params: TCreateParams);
begin
  inherited CreateParams(Params);
  if Application.MainForm <> nil then
    Params.WndParent := Application.MainForm.Handle;
end;
{$ENDIF}

function TCustomizeHelpDlg.ApplyEditChanges: Boolean;
var
  Res: TModalResult;
begin
  Result := not FEditChanged or (FEditChanged and (FileName.FileName = ''));
  if not Result then begin
    Res := MessageDlg('Apply changes to current item?', mtConfirmation,
      [mbYes, mbNo, mbCancel], 0);
    if Res = mrYes then begin
      if HelpList.Row < FHelpList.Count then begin
        FHelpList[HelpList.Row] := GetShortHint(FHelpList[HelpList.Row]) +
          '|' + FileName.FileName;
        Result := True;
      end;
    end
    else if Res = mrCancel then begin
      SysUtils.Abort;
    end;
  end;
  FEditChanged := False;
end;

procedure TCustomizeHelpDlg.FormCreate(Sender: TObject);
begin
  FHelpList := TStringList.Create;
  HelpList.ClientHeight := (HelpList.DefaultRowHeight + 1) * 5 - 1;
end;

procedure TCustomizeHelpDlg.FormDestroy(Sender: TObject);
begin
  FHelpList.Free;
end;

procedure TCustomizeHelpDlg.FileNameChange(Sender: TObject);
begin
  FEditChanged := True;
end;

procedure TCustomizeHelpDlg.OkBtnClick(Sender: TObject);
begin
  ApplyEditChanges;
end;

procedure TCustomizeHelpDlg.HelpListSelectCell(Sender: TObject; Col,
  Row: Longint; var CanSelect: Boolean);
begin
  ApplyEditChanges;
  if Row < FHelpList.Count then FileName.FileName := GetLongHint(FHelpList[Row])
  else FileName.FileName := '';
  FEditChanged := False;
end;

procedure TCustomizeHelpDlg.HelpListDrawCell(Sender: TObject; Col,
  Row: Longint; Rect: TRect; State: TGridDrawState);
var
  S: string;
begin
  if (Col = 0) and (Row < FHelpList.Count) then
    HelpList.DrawStr(Rect, IntToStr(Row + 1) + ' ', taRightJustify)
  else if Col = 1 then begin
    if Row < FHelpList.Count then S := GetShortHint(FHelpList[Row])
    else S := '';
    HelpList.DrawStr(Rect, S, taLeftJustify);
  end;
end;

procedure TCustomizeHelpDlg.HelpListSetEditText(Sender: TObject; ACol,
  ARow: Longint; const Value: string);
begin
  if ARow >= FHelpList.Count then begin
    if (Value <> '') then
      FHelpList.Add(Value + '|' + FileName.FileName)
    else begin
      SysUtils.Beep;
      Abort;
    end;
  end
  else begin
    if (Value = '') then FHelpList.Delete(ARow)
    else FHelpList[ARow] := Value + '|' + GetLongHint(FHelpList[ARow]);
  end;
  HelpList.RowCount := FHelpList.Count + 1;
end;

procedure TCustomizeHelpDlg.HelpListGetEditText(Sender: TObject; ACol,
  ARow: Longint; var Value: string);
begin
  if ARow < FHelpList.Count then Value := GetShortHint(FHelpList[ARow])
  else Value := '';
end;

procedure TCustomizeHelpDlg.HelpListKeyDown(Sender: TObject; var Key: Word;
  Shift: TShiftState);
var
  CanSelect: Boolean;
begin
  if (Key = VK_DELETE) and ((Shift = []) or (ssCtrl in Shift)) then begin
    if (HelpList.Row < FHelpList.Count) and not HelpList.EditorMode then begin
      if MessageDlg('Delete selected item?', mtConfirmation,
        [mbYes, mbNo], 0) = mrYes then
      begin
        FHelpList.Delete(HelpList.Row);
        HelpList.RowCount := FHelpList.Count + 1;
        HelpListSelectCell(HelpList, HelpList.Col, HelpList.Row, CanSelect);
      end;
    end;
  end
  else if (Shift = []) and (HelpList.Row = FHelpList.Count - 1) and
    (Key = VK_DOWN) then
  begin
    HelpList.RowCount := FHelpList.Count + 1;
  end;
end;

procedure TCustomizeHelpDlg.HelpListGetEditLimit(Sender: TObject;
  var MaxLength: Integer);
begin
  MaxLength := 50;
end;

procedure TCustomizeHelpDlg.HelpListRowMoved(Sender: TObject; FromIndex,
  ToIndex: Longint);
begin
  if (ToIndex >= 0) and (ToIndex < FHelpList.Count) and
    (FromIndex >= 0) and (FromIndex < FHelpList.Count) then
  begin
    FHelpList.Move(FromIndex, ToIndex);
    HelpList.Invalidate;
  end;
end;

end.