filtdlg.pas

来自「East make Tray Icon in delphi」· PAS 代码 · 共 155 行

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

                       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.sourceforge.net

 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                       }
{                                                       }
{*******************************************************}

unit FiltDlg;

interface

uses Messages, WinTypes, WinProcs, SysUtils, Classes, Graphics, Forms,
  Controls, StdCtrls, Buttons, ExtCtrls, JvMRUList,
  JvMRUManager, JvComponent, JvFormPlacement;

type
  TFilterDialog = class(TForm)
    Label1: TLabel;
    OkBtn: TButton;
    CancelBtn: TButton;
    Storage: TJvFormStorage ;
    UpCaseBox: TCheckBox;
    FilterEdit: TComboBox;
    MRU: TJvMRUManager ;
    procedure FormCreate(Sender: TObject);
    procedure UpCaseBoxClick(Sender: TObject);
    procedure FilterEditChange(Sender: TObject);
    procedure OkBtnClick(Sender: TObject);
    procedure FormShow(Sender: TObject);
  private
    FUpdating: Boolean;
  protected
    procedure CreateParams(var Params: TCreateParams); override;
  end;

function ShowFilterDialog(var Filter: string; X, Y: Integer): Boolean;

implementation

uses
  BDE, JvJVCLUtils;

{$R *.DFM}

function ShowFilterDialog(var Filter: string; X, Y: Integer): Boolean;
begin
  with TFilterDialog.Create(Application) do
  try
    Left := X;
    Top := Y;
    FilterEdit.Text := Filter;
    Result := ShowModal = mrOk;
    if Result then Filter := FilterEdit.Text;
  finally
    Free;
  end;
end;

{ TFilterDialog }

procedure TFilterDialog.CreateParams(var Params: TCreateParams);
begin
  inherited CreateParams(Params);
  if Application.MainForm <> nil then
    Params.WndParent := Application.MainForm.Handle;
end;

procedure TFilterDialog.FormCreate(Sender: TObject);
begin
  FilterEdit.MaxLength := DBIMAXTBLNAMELEN;
{$IFDEF WIN32}
  UpCaseBox.Visible := True;
  BorderStyle := bsToolWindow;
{$ENDIF}
end;

procedure TFilterDialog.UpCaseBoxClick(Sender: TObject);
begin
  if UpCaseBox.Checked then FilterEdit.Text := AnsiUpperCase(FilterEdit.Text);
end;

procedure TFilterDialog.FilterEditChange(Sender: TObject);
var
  SelStart, SelEnd: Integer;
{$IFNDEF WIN32}
  Res: LongInt;
{$ENDIF}
begin
  if UpCaseBox.Checked and not FUpdating then begin
    FUpdating := True;
    try
      if FilterEdit.HandleAllocated then begin
{$IFDEF WIN32}
        SendMessage(FilterEdit.Handle, CB_GETEDITSEL, Integer(@SelStart),
          Integer(@SelEnd));
{$ELSE}
        Res := SendMessage(FilterEdit.Handle, CB_GETEDITSEL, 0, 0);
        SelStart := LoWord(Res);
        SelEnd := HiWord(Res);
{$ENDIF}
      end;
      FilterEdit.Text := AnsiUpperCase(FilterEdit.Text);
      if FilterEdit.HandleAllocated then begin
        SendMessage(FilterEdit.Handle, CB_SETEDITSEL, 0,
{$IFDEF WIN32}
          MakeLParam(SelStart, SelEnd));
{$ELSE}
          MakeLong(SelStart, SelEnd));
{$ENDIF}
      end;
    finally
      FUpdating := False;
    end;
  end;
end;

procedure TFilterDialog.OkBtnClick(Sender: TObject);
begin
  MRU.Add(FilterEdit.Text, 0);
end;

procedure TFilterDialog.FormShow(Sender: TObject);
begin
  FilterEdit.Items.Assign(MRU.Strings);
end;

end.