u_observeitem.pas

一个简单的学籍管理软件

unit U_ObserveItem;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  HGrids, HDBGrids, TB97Tlbr, TB97Ctls, TB97, DBTables, Db, Menus;

type
  TFm_ObserveItem = class(TForm)
    DDS: TDataSource;
    Dock: TDock97;
    Tb97_Func: TToolbar97;
    TbBtn_Edit: TToolbarButton97;
    TbBtn_Add: TToolbarButton97;
    TbBtn_Delete: TToolbarButton97;
    TbSep01: TToolbarSep97;
    TbBtn_Help: TToolbarButton97;
    TbBtn_Exit: TToolbarButton97;
    MGrid: THDBGrid;
    DQuery: TQuery;
    DUpSQL: TUpdateSQL;
    PPM: TPopupMenu;
    PM_Add: TMenuItem;
    PM_Edit: TMenuItem;
    PM_Delete: TMenuItem;
    PM_Z01: TMenuItem;
    PM_Help: TMenuItem;
    PM_Exit: TMenuItem;
    DQueryI_PYDHAO: TIntegerField;
    DQueryS_PYNR: TStringField;
    TbBtn_Save: TToolbarButton97;
    TbSep02: TToolbarSep97;
    N1: TMenuItem;
    PM_Save: TMenuItem;
    TbBtn_Print: TToolbarButton97;
    TbSp01: TToolbarSep97;
    PM_Print: TMenuItem;
    PM_Z03: TMenuItem;
    procedure TbBtn_ExitClick(Sender: TObject);
    procedure FormClose(Sender: TObject; var Action: TCloseAction);
    procedure TbBtn_AddClick(Sender: TObject);
    procedure TbBtn_DeleteClick(Sender: TObject);
    procedure TbBtn_HelpClick(Sender: TObject);
    procedure DQueryBeforePost(DataSet: TDataSet);
    procedure DQueryAfterPost(DataSet: TDataSet);
    procedure TbBtn_EditClick(Sender: TObject);
    procedure TbBtn_SaveClick(Sender: TObject);
    procedure TbBtn_PrintClick(Sender: TObject);
  private
  public
  end;

var
  Fm_ObserveItem: TFm_ObserveItem;

procedure Show_ObserveItem;

implementation

uses U_Main, U_GlobalProc, U_GlobalVar, U_DM, U_Print;

{$R *.DFM}

procedure Show_ObserveItem;
var
  i: integer;
begin
  for i := Fm_Main.MDIChildCount - 1 downto 0 do
  begin
    if (Fm_Main.MDIChildren[i].Name <> 'Fm_Wizard') and
      (Fm_Main.MDIChildren[i].Name <> 'Fm_ObserveItem') then
      Fm_Main.MDIChildren[i].Close;
  end;
  if not Assigned(Fm_ObserveItem) then
  begin
    Fm_ObserveItem := TFm_ObserveItem.Create(Application);
    with Fm_ObserveItem do
    begin
      DQuery.Open;
      if DQuery.IsEmpty then
      begin
        MGrid.Options := MGrid.Options - [tgEditing];
        TbBtn_Edit.Enabled := False;
        TbBtn_Delete.Enabled := False;
        PM_Edit.Enabled := False;
        PM_Delete.Enabled := False;
      end;
      RefreshGridStyle(MGrid);
    end;
  end;
  with Fm_ObserveItem do
  begin
    if WindowState <> wsMaximized then
      WindowState := wsMaximized;
    Show;
    SetFocus;
  end;
end;

procedure TFm_ObserveItem.TbBtn_ExitClick(Sender: TObject);
begin
  Close;
end;

procedure TFm_ObserveItem.FormClose(Sender: TObject;
  var Action: TCloseAction);
begin
  DQuery.Close;
  Action := caFree;
  Fm_ObserveItem := nil;
end;

procedure TFm_ObserveItem.TbBtn_AddClick(Sender: TObject);
var
  tmOrder: integer;
begin
  tmOrder := 1;
  try
    with DQuery do
    begin
      DisableControls;
      First;
      while not Eof do
      begin
        if tmOrder <> FieldByName('i_pydhao').AsInteger then
          Break;
        Inc(tmOrder);
        Next;
      end;
      if Eof then
        Append
      else
        Insert;
      FieldByName('i_pydhao').AsInteger := tmOrder;
      MGrid.Options := MGrid.Options + [tgEditing];
    end;
  finally
    DQuery.EnableControls;
  end;
end;

procedure TFm_ObserveItem.TbBtn_DeleteClick(Sender: TObject);
begin
  if not U_GlobalProc.Show_ConfirmMess('真的删除当前条目吗') then
    Exit;
  DQuery.Delete;
  DQuery.ApplyUpdates;
  if DQuery.IsEmpty then
  begin
    MGrid.Options := MGrid.Options - [tgEditing];
    TbBtn_Edit.Enabled := False;
    TbBtn_Delete.Enabled := False;
    PM_Edit.Enabled := False;
    PM_Delete.Enabled := False;
  end;
end;

procedure TFm_ObserveItem.TbBtn_HelpClick(Sender: TObject);
begin //

end;

procedure TFm_ObserveItem.DQueryBeforePost(DataSet: TDataSet);
begin //
  with DQuery do
  if Trim(FieldByName('s_pynr').AsString) = '' then
  begin
    if (State = dsInsert) or ((State = dsEdit) and
        (not U_GlobalProc.Show_ConfirmMess(
          '词条内容被修改为空值，是否存盘？'))) then
    begin
      Cancel;
      if IsEmpty then
      begin
        MGrid.Options := MGrid.Options - [tgEditing];
        MGrid.Col := 1;
      end;
      Abort;
    end;
  end;
end;

procedure TFm_ObserveItem.DQueryAfterPost(DataSet: TDataSet);
begin
  if not DQuery.IsEmpty then
  begin
    TbBtn_Edit.Enabled := True;
    TbBtn_Delete.Enabled := True;
    PM_Edit.Enabled := True;
    PM_Delete.Enabled := True;
  end else
    MGrid.Options := MGrid.Options - [tgEditing];
  DQuery.ApplyUpdates;
end;

procedure TFm_ObserveItem.TbBtn_EditClick(Sender: TObject);
begin
  MGrid.Col := 2;
  DQuery.Edit;
end;

procedure TFm_ObserveItem.TbBtn_SaveClick(Sender: TObject);
begin //
  if DQuery.State in [dsEdit, dsInsert] then
    DQuery.Post;
end;

procedure TFm_ObserveItem.TbBtn_PrintClick(Sender: TObject);
begin
  Show_Print(MGrid);
end;

end.