dbflatlistbox.pas

(***FlatStyle v4.42.8.0 for DELPHI7 by comerose update***)2007.04.30 更新说明1.修正 TFlatListView 标题的平面显示(

unit dbFlatListBox;

interface 

uses Windows, SysUtils, Messages, Classes, Controls, Forms, TFlatEditUnit,
     Graphics, Menus, StdCtrls, ExtCtrls, Db, Mask, DBCtrls,
     TFlatListBoxUnit;
type
  TdbFlatListBox = class(TFlatListBox)
   private
    FDataLink: TFieldDataLink;
    procedure DataChange(Sender: TObject);
    procedure UpdateData(Sender: TObject);
    function GetDataField: string;
    function GetDataSource: TDataSource;
    function GetField: TField;
    function GetReadOnly: Boolean;
    procedure SetDataField(const Value: string);
    procedure SetDataSource(Value: TDataSource);
    procedure SetReadOnly(Value: Boolean);
    procedure SetItems(Value: TStrings);
    procedure WMLButtonDown(var Message: TWMLButtonDown); message WM_LBUTTONDOWN;
    procedure CMExit(var Message: TCMExit); message CM_EXIT;
  protected
    procedure Click; override;
    procedure KeyDown(var Key: Word; Shift: TShiftState); override;
    procedure KeyPress(var Key: Char); override;
    procedure Notification(AComponent: TComponent;
      Operation: TOperation); override;
  public
    constructor Create(AOwner: TComponent); override;
    destructor Destroy; override;
    function ExecuteAction(Action: TBasicAction): Boolean; override;
    function UpdateAction(Action: TBasicAction): Boolean; override;
    function UseRightToLeftAlignment: Boolean; override;
    property Field: TField read GetField;
  published
    property Align;
    property Anchors;
    property BiDiMode;
    property BorderStyle;
    property Color;
    property Constraints;
    property Ctl3D default True;
    property DataField: string read GetDataField write SetDataField;
    property DataSource: TDataSource read GetDataSource write SetDataSource;
    property DragCursor;
    property DragKind;
    property DragMode;
    property Enabled;
    property Font;
    property ImeMode;
    property ImeName;
    property IntegralHeight;
    property ItemHeight;
    property Items write SetItems;
    property ParentBiDiMode;
    property ParentColor;
    property ParentCtl3D;
    property ParentFont;
    property ParentShowHint;
    property PopupMenu;
    property ReadOnly: Boolean read GetReadOnly write SetReadOnly default False;
    property ShowHint;
    property Style;
    property TabOrder;
    property TabStop;
    property Visible;
    property OnClick;
    property OnContextPopup;
    property OnDblClick;
    property OnDragDrop;
    property OnDragOver;
    property OnDrawItem;
    property OnEndDock;
    property OnEndDrag;
    property OnEnter;
    property OnExit;
    property OnKeyDown;
    property OnKeyPress;
    property OnKeyUp;
    property OnMeasureItem;
    property OnMouseDown;
    property OnMouseMove;
    property OnMouseUp;
    property OnStartDock;
    property OnStartDrag;
  end;

procedure Register;

implementation
{ TDBListBox }

constructor TDBListBox.Create(AOwner: TComponent);
begin
  inherited Create(AOwner);
  FDataLink := TFieldDataLink.Create;
  FDataLink.Control := Self;
  FDataLink.OnDataChange := DataChange;
  FDataLink.OnUpdateData := UpdateData;
end;

destructor TDBListBox.Destroy;
begin
  FDataLink.Free;
  FDataLink := nil;
  inherited Destroy;
end;

procedure TDBListBox.Notification(AComponent: TComponent;
  Operation: TOperation);
begin
  inherited Notification(AComponent, Operation);
  if (Operation = opRemove) and (FDataLink <> nil) and
    (AComponent = DataSource) then DataSource := nil;
end;

function TDBListBox.UseRightToLeftAlignment: Boolean;
begin
  Result := DBUseRightToLeftAlignment(Self, Field);
end;

procedure TDBListBox.DataChange(Sender: TObject);
begin
  if FDataLink.Field <> nil then
    ItemIndex := Items.IndexOf(FDataLink.Field.Text) else
    ItemIndex := -1;
end;

procedure TDBListBox.UpdateData(Sender: TObject);
begin
  if ItemIndex >= 0 then
    FDataLink.Field.Text := Items[ItemIndex] else
    FDataLink.Field.Text := '';
end;

procedure TDBListBox.Click;
begin
  if FDataLink.Edit then
  begin
    inherited Click;
    FDataLink.Modified;
  end;
end;

function TDBListBox.GetDataSource: TDataSource;
begin
  Result := FDataLink.DataSource;
end;

procedure TDBListBox.SetDataSource(Value: TDataSource);
begin
  FDataLink.DataSource := Value;
  if Value <> nil then Value.FreeNotification(Self);
end;

function TDBListBox.GetDataField: string;
begin
  Result := FDataLink.FieldName;
end;

procedure TDBListBox.SetDataField(const Value: string);
begin
  FDataLink.FieldName := Value;
end;

function TDBListBox.GetReadOnly: Boolean;
begin
  Result := FDataLink.ReadOnly;
end;

procedure TDBListBox.SetReadOnly(Value: Boolean);
begin
  FDataLink.ReadOnly := Value;
end;

function TDBListBox.GetField: TField;
begin
  Result := FDataLink.Field;
end;

procedure TDBListBox.KeyDown(var Key: Word; Shift: TShiftState);
begin
  inherited KeyDown(Key, Shift);
  if Key in [VK_PRIOR, VK_NEXT, VK_END, VK_HOME, VK_LEFT, VK_UP,
    VK_RIGHT, VK_DOWN] then
    if not FDataLink.Edit then Key := 0;
end;

procedure TDBListBox.KeyPress(var Key: Char);
begin
  inherited KeyPress(Key);
  case Key of
    #32..#255:
      if not FDataLink.Edit then Key := #0;
    #27:
      FDataLink.Reset;
  end;
end;

procedure TDBListBox.WMLButtonDown(var Message: TWMLButtonDown);
begin
  if FDataLink.Edit then inherited
  else
  begin
    SetFocus;
    with Message do
      MouseDown(mbLeft, KeysToShiftState(Keys), XPos, YPos);
  end;
end;

procedure TDBListBox.CMExit(var Message: TCMExit);
begin
  try
    FDataLink.UpdateRecord;
  except
    SetFocus;
    raise;
  end;
  inherited;
end;

procedure TDBListBox.SetItems(Value: TStrings);
begin
  Items.Assign(Value);
  DataChange(Self);
end;

function TDBListBox.ExecuteAction(Action: TBasicAction): Boolean;
begin
  Result := inherited ExecuteAction(Action) or (FDataLink <> nil) and
    FDataLink.ExecuteAction(Action);
end;

function TDBListBox.UpdateAction(Action: TBasicAction): Boolean;
begin
  Result := inherited UpdateAction(Action) or (FDataLink <> nil) and
    FDataLink.UpdateAction(Action);
end;

procedure Register;
begin
  RegisterComponents('FlatStyle', [TdbFlatListBox]);
end;

end.