toolctrlseh.pas

delphi控件类

  if W < 8 then PWid := 1;
  W := ElRect.Left + W div 2 - PWid div 2 + Ord(Pressed) ;//- Ord(not Active and Flat);
  H := ElRect.Top + (ElRect.Bottom - ElRect.Top) div 2 - PWid div 2 + Ord(Pressed);

  if not Enabled then
  begin
    Inc(W);Inc(H);
    Brush := GetSysColorBrush(COLOR_BTNHILIGHT);
    SaveBrush := SelectObject(DC, Brush);
    PatBlt(DC, W, H, PWid, PWid, PATCOPY);
    PatBlt(DC, W - InterP - PWid, H, PWid, PWid, PATCOPY);
    PatBlt(DC, W + InterP + PWid, H, PWid, PWid, PATCOPY);
    Dec(W);Dec(H);
    SelectObject(DC, SaveBrush);
    Brush := GetSysColorBrush(COLOR_BTNSHADOW);
  end else
    Brush := GetSysColorBrush(COLOR_BTNTEXT);

  SaveBrush := SelectObject(DC, Brush);
  PatBlt(DC, W, H, PWid, PWid, PATCOPY);
  PatBlt(DC, W - InterP - PWid, H, PWid, PWid, PATCOPY);
  PatBlt(DC, W + InterP + PWid, H, PWid, PWid, PATCOPY);
  SelectObject(DC, SaveBrush);
end;

procedure DrawOneButton(DC: HDC; Style:TDrawButtonControlStyleEh;
  ARect: TRect; Enabled, Flat, Active, Down, DownDirection: Boolean);
var Rgn, SaveRgn: HRgn;
    r:Integer;
    Flags:Integer;
    IsClipRgn:Boolean;
    DRect:TRect;
//    Brush: HBRUSH;
begin
  DRect := ARect;
  LPtoDP(DC,DRect,2);

  IsClipRgn := Flat and Active;
  r := 0; SaveRgn := 0;
  if IsClipRgn then
  begin
    SaveRgn := CreateRectRgn(0,0,0,0);
    r := GetClipRgn(DC, SaveRgn);
    with DRect do
      Rgn := CreateRectRgn(Left+1, Top+1, Right-1, Bottom-1);
    SelectClipRgn(DC, Rgn);
    DeleteObject(Rgn);
  end;

  if Flat then
    if not Active {and not (Style=bcsUpDownEh)}
      then InflateRect(ARect,2,2)
      else InflateRect(ARect,1,1);
  Flags := DownFlags[Down] or FlatFlags[Flat] or EnabledFlags[Enabled];
  case Style of
    bcsDropDownEh: DrawFrameControl(DC, ARect, DFC_SCROLL, Flags or DFCS_SCROLLCOMBOBOX);
    bcsEllipsisEh: DrawEllipsisButton(DC, ARect, Enabled, Active, Flat, Down);
    bcsUpDownEh: DrawFrameControl(DC, ARect, DFC_SCROLL, Flags or IsDownFlags[DownDirection]);
  end;
  if Flat then
    if not Active {and not (Style=bcsUpDownEh)}
      then InflateRect(ARect,-2,-2)
      else InflateRect(ARect,-1,-1);

  if IsClipRgn then
  begin
    if r = 0
      then SelectClipRgn(DC, 0)
      else SelectClipRgn(DC, SaveRgn);
    DeleteObject(SaveRgn);
    if Down
      then DrawEdge(DC, ARect, BDR_SUNKENOUTER, BF_RECT)
      else DrawEdge(DC, ARect, BDR_RAISEDINNER, BF_RECT)
  end;
end;

type
  PPoints = ^TPoints;
  TPoints = array[0..0] of TPoint;

  TButtonBitmapInfoEh = record
    Size:TPoint;
    BitmapType: TDrawButtonControlStyleEh;
    Flat:Boolean;
    case TDrawButtonControlStyleEh of
      bcsDropDownEh, bcsEllipsisEh, bcsUpDownEh: (Pressed, Active, Enabled, DownDirect:Boolean);
      bcsCheckboxEh: (State: TCheckBoxState);
  end;

  { TButtonsBitmapCache }

  TButtonBitmapInfoBitmapEh = record
    BitmapInfo: TButtonBitmapInfoEh;
    Bitmap: TBitmap;
  end;

  PButtonBitmapInfoBitmapEh = ^TButtonBitmapInfoBitmapEh;

  TButtonsBitmapCache = class(TList)
  private
    function Get(Index: Integer): PButtonBitmapInfoBitmapEh;
//    procedure Put(Index: Integer; const Value: PButtonBitmapInfoBitmapEh);
  public
    procedure Clear; override;
    function GetButtonBitmap(ButtonBitmapInfo: TButtonBitmapInfoEh):TBitmap;
    property Items[Index: Integer]: PButtonBitmapInfoBitmapEh read Get {write Put}; default;
  end;

var ButtonsBitmapCache: TButtonsBitmapCache;

procedure ClearButtonsBitmapCache;
begin
  ButtonsBitmapCache.Clear;
end;

function RectSize(ARect:TRect):TSize;
begin
  Result.cx := ARect.Right-ARect.Left;
  Result.cy := ARect.Bottom-ARect.Top;
end;

procedure PaintButtonControlEh(DC: HDC; ARect:TRect;ParentColor:TColor;
               Style:TDrawButtonControlStyleEh; DownButton:Integer;
               Flat,Active,Enabled:Boolean; State: TCheckBoxState);
var
  Rgn, SaveRgn: HRgn;
  HalfRect, DRect: TRect;
  ASize: TSize;
  r: Integer;
  Brush: HBRUSH;
  IsClipRgn: Boolean;
  BitmapInfo: TButtonBitmapInfoEh;
  Bitmap: TBitmap;
begin
  SaveRgn := 0; r := 0;
  FillChar(BitmapInfo,Sizeof(BitmapInfo),#0);
  BitmapInfo.BitmapType := Style;
  BitmapInfo.Flat := Flat;

  if Style = bcsCheckboxEh then
  begin
    ASize := RectSize(ARect);
    if ASize.cx < ASize.cy then
    begin
      ARect.Top := ARect.Top + (ASize.cy - ASize.cx) div 2;
      ARect.Bottom := ARect.Bottom - (ASize.cy - ASize.cx) div 2 - (ASize.cy - ASize.cx) mod 2;
    end else if ASize.cx > ASize.cy then
    begin
      ARect.Left := ARect.Left + (ASize.cx - ASize.cy) div 2;
      ARect.Right := ARect.Right - (ASize.cx - ASize.cy) div 2 - (ASize.cx - ASize.cy) mod 2;
    end;

    if Flat then InflateRect(ARect,-1,-1);
    if UseButtonsBitmapCache then
    begin
      BitmapInfo.Size := Point(ARect.Right-ARect.Left,ARect.Bottom-ARect.Top);
      BitmapInfo.State := State;
      Bitmap := ButtonsBitmapCache.GetButtonBitmap(BitmapInfo);

      StretchBlt(DC, ARect.Left, ARect.Top, ARect.Right - ARect.Left,
        ARect.Bottom - ARect.Top, Bitmap.Canvas.Handle, 0, 0,
        Bitmap.Width, Bitmap.Height, cmSrcCopy);
    end else
      DrawCheck(DC,ARect,State,Enabled,Flat);

    if Flat then
    begin
      InflateRect(ARect,1,1);
      Brush := CreateSolidBrush(ColorToRGB(ParentColor));
      FrameRect(DC, ARect, Brush);
      DeleteObject(Brush);
    end;
  end else
  begin
    BitmapInfo.Active := Active;
    BitmapInfo.Enabled := Enabled;

    IsClipRgn := Flat and not Active;
    if IsClipRgn then
    begin
      DRect := ARect;
      LPtoDP(DC,DRect,2);
      InflateRect(ARect,-1,-1);
      if not UseButtonsBitmapCache then
      begin
        SaveRgn := CreateRectRgn(0,0,0,0);
        r := GetClipRgn(DC, SaveRgn);
        with DRect do
          Rgn := CreateRectRgn(Left+1, Top+1, Right-1, Bottom-1);
        SelectClipRgn(DC, Rgn);
        DeleteObject(Rgn);
      end;
    end;

    if Style = bcsUpDownEh then
    begin
      if IsClipRgn then InflateRect(ARect,1,1);
      HalfRect := ARect;
      with HalfRect do
        Bottom := Top + (Bottom-Top) div 2;
      if IsClipRgn then InflateRect(HalfRect,-1,-1);
      if UseButtonsBitmapCache then
      begin
        BitmapInfo.Size := Point(HalfRect.Right-HalfRect.Left,HalfRect.Bottom-HalfRect.Top);
        BitmapInfo.Pressed := DownButton=1;
        BitmapInfo.DownDirect := False;
        Bitmap := ButtonsBitmapCache.GetButtonBitmap(BitmapInfo);
        StretchBlt(DC, HalfRect.Left, HalfRect.Top, HalfRect.Right - HalfRect.Left,
          HalfRect.Bottom - HalfRect.Top, Bitmap.Canvas.Handle, 0, 0,
          Bitmap.Width, Bitmap.Height, cmSrcCopy);
      end else
        DrawOneButton(DC, Style, HalfRect, Enabled, Flat, Active, DownButton=1, False);
      if IsClipRgn then InflateRect(HalfRect,1,1);
      HalfRect.Bottom := ARect.Bottom;
      with HalfRect do
        Top := Bottom - (Bottom-Top) div 2;
      if IsClipRgn then InflateRect(HalfRect,-1,-1);
      if UseButtonsBitmapCache then
      begin
        BitmapInfo.Size := Point(HalfRect.Right-HalfRect.Left,HalfRect.Bottom-HalfRect.Top);
        BitmapInfo.Pressed := DownButton=2;
        BitmapInfo.DownDirect := True;
        Bitmap := ButtonsBitmapCache.GetButtonBitmap(BitmapInfo);
        StretchBlt(DC, HalfRect.Left, HalfRect.Top, HalfRect.Right - HalfRect.Left,
          HalfRect.Bottom - HalfRect.Top, Bitmap.Canvas.Handle, 0, 0,
          Bitmap.Width, Bitmap.Height, cmSrcCopy);
      end else
        DrawOneButton(DC, Style, HalfRect, Enabled, Flat, Active, DownButton=2, True);
      if IsClipRgn
        then InflateRect(ARect,-1,-1);
      if ((ARect.Bottom-ARect.Top) mod 2 = 1) or (IsClipRgn) then
      begin
        HalfRect := ARect;
        HalfRect.Top := (HalfRect.Bottom + HalfRect.Top) div 2;
        HalfRect.Bottom := HalfRect.Top;
        if (ARect.Bottom-ARect.Top) mod 2 = 1 then Inc(HalfRect.Bottom);
        if IsClipRgn then InflateRect(HalfRect,0,1);
        Brush := CreateSolidBrush(ColorToRGB(ParentColor));
        FillRect(DC, HalfRect,Brush);
        DeleteObject(Brush);
      end;
    end else if UseButtonsBitmapCache then
    begin
      BitmapInfo.Size := Point(ARect.Right-ARect.Left,ARect.Bottom-ARect.Top);
      BitmapInfo.Pressed := DownButton<>0;
      Bitmap := ButtonsBitmapCache.GetButtonBitmap(BitmapInfo);
      StretchBlt(DC, ARect.Left, ARect.Top, ARect.Right - ARect.Left,
        ARect.Bottom - ARect.Top, Bitmap.Canvas.Handle, 0, 0,
        Bitmap.Width, Bitmap.Height, cmSrcCopy);
    end else
      DrawOneButton(DC, Style, ARect, Enabled, Flat, Active, DownButton<>0, True);

    if IsClipRgn then
    begin
      InflateRect(ARect,1,1);
      if not UseButtonsBitmapCache then
      begin
        if r = 0
          then SelectClipRgn(DC, 0)
          else SelectClipRgn(DC, SaveRgn);
        DeleteObject(SaveRgn);
      end;
      Brush := CreateSolidBrush(ColorToRGB(ParentColor));
      FrameRect(DC, ARect, Brush);
      DeleteObject(Brush);
    end;
  end;
end;

function GetDefaultFlatButtonWidth:Integer;
var
  DC: HDC;
  SysMetrics: TTextMetric;
begin
  DC := GetDC(0);
  GetTextMetrics(DC, SysMetrics);
  ReleaseDC(0, DC);
  Result := Round(SysMetrics.tmHeight / 3 * 2);
  if Result mod 2 = 1 then Inc(Result);
  if Result > GetSystemMetrics(SM_CXVSCROLL)
    then Result := GetSystemMetrics(SM_CXVSCROLL);
end;

{$DEBUGINFO OFF}
function VarEquals(const V1, V2: Variant): Boolean;
var i:Integer;
begin
  Result := not (VarIsArray(V1) xor VarIsArray(V2));
  if not Result then Exit;
  Result := False;
  try
    if VarIsArray(V1) and VarIsArray(V2) and
     (VarArrayDimCount(V1) = VarArrayDimCount(V2)) and
     (VarArrayLowBound(V1,1) = VarArrayLowBound(V2,1)) and
     (VarArrayHighBound(V1,1) = VarArrayHighBound(V2,1))
    then
      for i := VarArrayLowBound(V1,1) to VarArrayHighBound(V1,1) do
      begin
        Result := V1[i] = V2[i];
        if not Result then Exit;
      end
    else
      Result := V1 = V2;
  except
  end;
end;
{$DEBUGINFO ON}

function TButtonsBitmapCache.GetButtonBitmap(ButtonBitmapInfo: TButtonBitmapInfoEh):TBitmap;
var i: Integer;
    BitmapInfoBitmap: PButtonBitmapInfoBitmapEh;
begin
  if ButtonBitmapInfo.Size.X < 0 then ButtonBitmapInfo.Size.X := 0;
  if ButtonBitmapInfo.Size.Y < 0 then ButtonBitmapInfo.Size.Y := 0;
  for i := 0 to Count-1 do
    if CompareMem(@ButtonBitmapInfo,Items[i],SizeOf(TButtonBitmapInfoEh)) then
    begin
      Result := Items[i].Bitmap;
      Exit;
    end;
  New(BitmapInfoBitmap);
  Add(BitmapInfoBitmap);
  BitmapInfoBitmap.BitmapInfo := ButtonBitmapInfo;
  BitmapInfoBitmap.Bitmap := TBitmap.Create;
  BitmapInfoBitmap.Bitmap.Width := ButtonBitmapInfo.Size.X;
  BitmapInfoBitmap.Bitmap.Height := ButtonBitmapInfo.Size.Y;

  case ButtonBitmapInfo.BitmapType of
    bcsCheckboxEh:
      DrawCheck(BitmapInfoBitmap.Bitmap.Canvas.Handle,
                Rect(0,0,ButtonBitmapInfo.Size.X,ButtonBitmapInfo.Size.Y),
                ButtonBitmapInfo.State,
                True,
                ButtonBitmapInfo.Flat
                );
     bcsEllipsisEh, bcsUpDownEh, bcsDropDownEh:
       DrawOneButton(BitmapInfoBitmap.Bitmap.Canvas.Handle,ButtonBitmapInfo.BitmapType,
                Rect(0,0,ButtonBitmapInfo.Size.X,ButtonBitmapInfo.Size.Y),
                ButtonBitmapInfo.Enabled, ButtonBitmapInfo.Flat,
                ButtonBitmapInfo.Active, ButtonBitmapInfo.Pressed,
                ButtonBitmapInfo.DownDirect);
  end;
  Result := BitmapInfoBitmap.Bitmap;
end;

function TButtonsBitmapCache.Get(Index: Integer): PButtonBitmapInfoBitmapEh;
begin
  Result := inherited Items[Index];
end;

{procedure TButtonsBitmapCache.Put(Index: Integer; const Value: PButtonBitmapInfoBitmapEh);
begin
  inherited Items[Index] := Value;
end;}

procedure TButtonsBitmapCache.Clear;
var i: Integer;
begin
  for i := 0 to Count-1 do
  begin
    Items[i].Bitmap.Free;
    Dispose(Items[i]);
  end;
  inherited Clear;
end;

procedure GetFieldsProperty(List: TList; DataSet: TDataSet;
   Control: TComponent; const FieldNames: String);
var
  Pos: Integer;
  Field: TField;
  FieldName: String;
begin
  Pos := 1;
  while Pos <= Length(FieldNames) do
  begin
    FieldName := ExtractFieldName(FieldNames, Pos);
    Field := DataSet.FindField(FieldName);
    if Field = nil then
      DatabaseErrorFmt(SFieldNotFound, [FieldName], Control);
    if Assigned(List) then List.Add(Field);
  end;
end;

function GetFieldsProperty(DataSet: TDataSet; Control: TComponent;
   const FieldNames: String):TFieldsArrEh;
var FieldList:TList;
    i:Integer;
begin
  FieldList := TList.Create;
  GetFieldsProperty(FieldList,DataSet, Control, FieldNames);
  SetLength(Result,FieldList.Count);
  for i := 0 to FieldList.Count-1 do Result[i] := FieldList[i];
  FieldList.Free;
end;

procedure DataSetSetFieldValues(DataSet: TDataSet; Fields: String; Value:Variant);
var FieldList: TList;
    i:Integer;
begin
  if VarEquals(Value,Null) then
  begin
    FieldList := TList.Create;
    try
      Dataset.GetFieldList(FieldList,Fields);
      for i := 0 to FieldList.Count-1 do
        TField(FieldList[i]).Clear;
    finally
      FieldList.Free;
    end;
  end else
    DataSet.FieldValues[Fields] := Value;
end;

{ TDataSourceLink }

constructor TLookupCtrlDataLinkEh.Create;
begin
  inherited Create;
//  VisualControl := True;
end;

procedure TLookupCtrlDataLinkEh.ActiveChanged;
begin
  if FDBLookupControl <> nil then FDBLookupControl.UpdateDataFields;
end;

procedure TLookupCtrlDataLinkEh.FocusControl(Field: TFieldRef);
begin
  if (Field^ <> nil) and (Field^ = FDBLookupControl.Field) and
    (FDBLookupControl <> nil) and FDBLookupControl.CanFocus then