frxctrls.pas

这个是功能强大的报表软件

           begin
             // This check is necessary to be sure that combo is created, not
             // RECREATED (somehow CM_RECREATEWND does not work)
             SetWindowLong(FListHandle, GWL_WNDPROC, Longint(FDefListProc));
             FDefListProc := nil;
             FChildHandle := Message.lParam;
           end
          else
           begin
             // WM_Create is the only event I found where I can get the ListBox handle.
             // The fact that combo box usually creates more then 1 handle complicates the
             // things, so I have to have the FChildHandle to resolve it later (in CreateWnd).
             if FChildHandle = 0 then
               FChildHandle := Message.lParam
             else
               FListHandle := Message.lParam;
           end;
       end;
    WM_WINDOWPOSCHANGING:
      MoveWindow(EditHandle, 3+FEditOffset, 3, Width-FButtonWidth-8-FEditOffset,
        Height-6, True);
  end;
  inherited;
end;

procedure TfrxCustomComboBox.WMPaint(var Message: TWMPaint);
var
  PS, PSE: TPaintStruct;
begin
  BeginPaint(Handle,PS);
  try
    if Enabled then
    begin
      DrawImage(PS.HDC, ItemIndex ,Rect(3, 3, FEditOffset + 3, Height - 3));
      if GetSolidBorder then
      begin
        PaintBorder(PS.HDC, True);
        if DroppedDown then
          PaintButton(2)
        else
          PaintButton(1);
      end else
      begin
        PaintBorder(PS.HDC, False);
        PaintButton(0);
      end;
    end else
    begin
      BeginPaint(EditHandle, PSE);
      try
        PaintDisabled;
      finally
        EndPaint(EditHandle, PSE);
      end;
    end;
  finally
    EndPaint(Handle,PS);
  end;
  Message.Result := 0;
end;

procedure TfrxCustomComboBox.DrawImage(DC: HDC; Index: Integer; R: TRect);
begin
  if FEditOffset > 0 then
   FillRect(DC, R, GetSysColorBrush(COLOR_WINDOW));
end;

procedure TfrxCustomComboBox.ComboWndProc(var Message: TMessage; ComboWnd: HWnd;
  ComboProc: Pointer);
var
  DC: HDC;
begin
  inherited;
  if (ComboWnd = EditHandle) then
    case Message.Msg of
      WM_SETFOCUS:
        begin
          DC:=GetWindowDC(Handle);
          PaintBorder(DC,True);
          PaintButton(1);
          ReleaseDC(Handle,DC);
        end;
      WM_KILLFOCUS:
        begin
          DC:=GetWindowDC(Handle);
          PaintBorder(DC,False);
          PaintButton(0);
          ReleaseDC(Handle,DC);
        end;
    end;
end;

procedure TfrxCustomComboBox.CNCommand(var Message: TWMCommand);
begin
  inherited;
  if (Message.NotifyCode in [CBN_CLOSEUP]) then
    PaintButton(1);
end;

procedure TfrxCustomComboBox.PaintBorder(DC: HDC; const SolidBorder: Boolean);
var
  R: TRect;
begin
  GetWindowRect(Handle, R);
  OffsetRect(R, -R.Left, -R.Top);
  if SolidBorder then
    FrameRect(DC, R, GetSysColorBrush(COLOR_HIGHLIGHT))
  else
    FrameRect(DC, R, GetSysColorBrush(COLOR_BTNFACE));
  InflateRect(R, -1, -1);
  FrameRect(DC, R, GetSysColorBrush(COLOR_WINDOW));
  InflateRect(R, -1, -1);
  R.Right:=R.Right - FButtonWidth - 2;
  FrameRect(DC, R, GetSysColorBrush(COLOR_WINDOW));
end;

procedure TfrxCustomComboBox.PaintButtonGlyph(DC: HDC; X: Integer; Y: Integer; Color: TColor);
var
  Pen, SavePen: HPEN;
begin
  Pen := CreatePen(PS_SOLID, 1, ColorToRGB(Color));
  SavePen := SelectObject(DC, Pen);
  MoveToEx(DC, X, Y, nil);
  LineTo(DC, X + 5, Y);
  MoveToEx(DC, X + 1, Y + 1, nil);
  LineTo(DC, X + 4, Y + 1);
  MoveToEx(DC, x + 2, Y + 2, nil);
  LineTo(DC, X + 3, Y + 2);
  SelectObject(DC, SavePen);
  DeleteObject(Pen);
end;

procedure TfrxCustomComboBox.PaintButton(ButtonStyle: Integer);
var
  R: TRect;
  DC: HDC;
  X, Y: Integer;

  procedure FillButton(DC: HDC; R: TRect; Color: TColor);
  var
    Brush, SaveBrush: HBRUSH;
  begin
    Brush := CreateSolidBrush(ColorToRGB(Color));
    SaveBrush := SelectObject(DC, Brush);
    FillRect(DC, R, Brush);
    SelectObject(DC, SaveBrush);
    DeleteObject(Brush);
  end;

  procedure PaintButtonLine(DC: HDC; Color: TColor);
  var
    Pen, SavePen: HPEN;
    R: TRect;
  begin
    GetWindowRect(Handle, R);
    OffsetRect (R, -R.Left, -R.Top);
    InflateRect(R, -FButtonWidth - 4, -1);
    Pen := CreatePen(PS_SOLID, 1, ColorToRGB(Color));
    SavePen := SelectObject(DC, Pen);
    MoveToEx(DC, R.Right, R.Top, nil);
    LineTo(DC, R.Right, R.Bottom);
    SelectObject(DC, SavePen);
    DeleteObject(Pen);
  end;

begin
  DC := GetWindowDC(Handle);
  X := Trunc(FButtonWidth / 2) + Width - FButtonWidth - 4;
  Y := Trunc((Height - 4) / 2) + 1;
  SetRect(R, Width - FButtonWidth - 3, 1, Width - 1, Height - 1);
  if ButtonStyle = 0 then //No 3D border
  begin
    FillButton(DC, R, clBtnFace);
    FrameRect(DC, R, GetSysColorBrush(COLOR_WINDOW));
    PaintButtonLine(DC, clWindow);
    PaintButtonGlyph(DC, X, Y, clBtnText);
  end;
  if ButtonStyle = 1 then //3D up border
  begin
    FillButton(DC, R, Blend(clHighlight, clWindow, 30));
    PaintButtonLine(DC, clHighlight);
    PaintButtonGlyph(DC, X, Y, clBtnText);
  end;
  if ButtonStyle = 2 then //3D down border
  begin
    FillButton(DC, R, Blend(clHighlight, clWindow, 50));
    PaintButtonLine(DC, clHighlight);
    PaintButtonGlyph(DC, X, Y, clCaptionText);
  end;
  ReleaseDC(Handle, DC);
end;

procedure TfrxCustomComboBox.PaintDisabled;
var
  R: TRect;
  Brush, SaveBrush: HBRUSH;
  DC: HDC;
  BtnShadowBrush: HBRUSH;
begin
  BtnShadowBrush := GetSysColorBrush(COLOR_BTNSHADOW);
  DC := GetWindowDC(Handle);
  Brush := CreateSolidBrush(GetSysColor(COLOR_BTNFACE));
  SaveBrush := SelectObject(DC, Brush);
  FillRect(DC, ClientRect, Brush);
  SelectObject(DC, SaveBrush);
  DeleteObject(Brush);
  GetWindowRect(Handle, R);
  OffsetRect(R, -R.Left, -R.Top);
  FrameRect(DC, R, BtnShadowBrush);
  PaintButtonGlyph(DC, Trunc(FButtonWidth / 2) + Width - FButtonWidth - 4,
    Trunc((Height - 4) / 2) + 1, clGrayText);
  ReleaseDC(Handle,DC);
end;

procedure TfrxCustomComboBox.CMEnabledChanged(var Msg: TMessage);
begin
  inherited;
  Invalidate;
end;

procedure TfrxCustomComboBox.CMMouseEnter(var Message: TMessage);
var
  DC: HDC;
begin
  inherited;
  msMouseInControl := True;
  if Enabled and not (GetFocus = EditHandle) and not DroppedDown then
  begin
    DC:=GetWindowDC(Handle);
    PaintBorder(DC, True);
    PaintButton(1);
    ReleaseDC(Handle, DC);
  end;
end;

procedure TfrxCustomComboBox.CMMouseLeave(var Message: TMessage);
var
  DC: HDC;
begin
  inherited;
  msMouseInControl := False;
  if Enabled  and not (GetFocus = EditHandle) and not DroppedDown then
  begin
    DC:=GetWindowDC(Handle);
    PaintBorder(DC, False);
    PaintButton(0);
    ReleaseDC(Handle, DC);
  end;
end;

function TfrxCustomComboBox.GetSolidBorder: Boolean;
begin
  Result := ((csDesigning in ComponentState)) or
    (DroppedDown or (GetFocus = EditHandle) or msMouseInControl);
end;

function TfrxCustomComboBox.GetListHeight: Integer;
begin
  Result := ItemHeight * Min(DropDownCount, Items.Count) + 2;
  if (DropDownCount <= 0) or (Items.Count = 0) then
    Result := ItemHeight + 2;
end;

procedure TfrxCustomComboBox.CMFontChanged(var Message: TMessage);
begin
  inherited;
  ItemHeight := GetFontHeight(Font);
  RecreateWnd;
end;


{ TfrxFontComboBox }

function CreateBitmap(ResName: PChar): TBitmap;
begin
   Result := TBitmap.Create;
   Result.Handle := LoadBitmap(HInstance, ResName);
   if Result.Handle = 0 then
   begin
     Result.Free;
     Result := nil;
   end;
end;

function EnumFontsProc(var LogFont: TLogFont; var TextMetric: TTextMetric;
  FontType: Integer; Data: Pointer): Integer; stdcall;
begin
  if (TStrings(Data).IndexOf(LogFont.lfFaceName) < 0) then
    TStrings(Data).AddObject(LogFont.lfFaceName, TObject(FontType));
  Result := 1;
end;

constructor TfrxFontComboBox.Create(AOwner: TComponent);
begin
  inherited Create(AOwner);
  if not (csDesigning in ComponentState) then
    frFontViewForm := TfrxFontPreview.Create(Self);
  FTrueTypeBMP := CreateBitmap('FRXTRUETYPE_FNT');
  FDeviceBMP := CreateBitmap('FRXDEVICE_FNT');
  DropDownCount := 12;
  Width := 150;
  FEditOffset := 16;
  FReadOnly := True;
  FShowMRU := True;
  Numused := -1;
  MRURegKey := '';
end;

destructor TfrxFontComboBox.Destroy;
begin
  FTrueTypeBMP.Free;
  FDeviceBMP.Free;
  if not (csDesigning in ComponentState) then
    frFontViewForm.Destroy;
  inherited Destroy;
end;

procedure TfrxFontComboBox.Loaded;
begin
  inherited Loaded;
  if csDesigning in ComponentState then exit;
  FUpdate := True;
  try
    PopulateList;
    if Items.IndexOf(Text) = -1 then
      ItemIndex:=0;
  finally
    FUpdate := False;
  end;
end;

procedure TfrxFontComboBox.SetRegKey(Value: String);
begin
  if Value = '' then
    FRegKey := '\Software\Fast Reports\MRUFont' else
    FRegKey := Value;
end;

procedure TfrxFontComboBox.PopulateList;
var
  LFont: TLogFont;
  DC: HDC;
  Reg: TRegistry;
  s: String;
  i: Integer;
  str: TStringList;
begin
  Sorted:=True;
  Items.BeginUpdate;
  str := TStringList.Create;
  str.Sorted := True;
  try
    Clear;
    DC := GetDC(0);
    try
      FillChar(LFont, sizeof(LFont), 0);
      LFont.lfCharset := DEFAULT_CHARSET;
      EnumFontFamiliesEx(DC, LFont, @EnumFontsProc, LongInt(str), 0);
    finally
      ReleaseDC(0, DC);
    end;
    if frxPrinters.HasPhysicalPrinters then
    try
      FillChar(LFont, sizeof(LFont), 0);
      LFont.lfCharset := DEFAULT_CHARSET;
      if frxPrinters.Printer <> nil then
        EnumFontFamiliesEx(frxPrinters.Printer.Canvas.Handle, LFont, @EnumFontsProc, LongInt(str), 0);
    except;
    end;
  finally
    Items.Assign(str);
    Items.EndUpdate;
  end;
  str.Free;
  Sorted := False;
  if FShowMRU then
  begin
    NumUsed := -1;
    Items.BeginUpdate;
    Reg:=TRegistry.Create;
    try
      Reg.OpenKey(FRegKey, True);
      for i := 4 downto 0 do
      begin
        s := Reg.ReadString('Font' + IntToStr(i));
        if (s <> '') and (Items.IndexOf(s) <> -1) then
        begin
          Items.InsertObject(0, s, TObject(Reg.ReadInteger('FontType' + IntToStr(i))));
          Inc(Numused);
        end else
        begin
          Reg.WriteString('Font' + IntToStr(i), '');
          Reg.WriteInteger('FontType' + IntToStr(i), 0);
        end;
      end;
    finally
      Reg.Free;
      Items.EndUpdate;
    end;
  end;
end;

procedure TfrxFontComboBox.DrawImage(DC: HDC; Index: Integer; R: TRect);
var
  C: TCanvas;
  Bitmap: TBitmap;
begin
  inherited;
  Index := Items.IndexOf(Text);
  if Index = -1 then exit;
  C := TCanvas.Create;
  C.Handle := DC;
  if (Integer(Items.Objects[Index]) and TRUETYPE_FONTTYPE) <> 0 then
    Bitmap := FTrueTypeBMP
  else if (Integer(Items.Objects[Index]) and DEVICE_FONTTYPE) <> 0 then
    Bitmap := FDeviceBMP
  else
    Bitmap := nil;
  if Bitmap <> nil then
  begin
    C.Brush.Color := clWindow;
    C.BrushCopy(Bounds(R.Left, (R.Top + R.Bottom - Bitmap.Height)
     div 2, Bitmap.Width, Bitmap.Height), Bitmap, Bounds(0, 0, Bitmap.Width,
     Bitmap.Height), Bitmap.TransparentColor);
  end;
  C.Free;
end;


procedure TfrxFontComboBox.DrawItem(Index: Integer; Rect: TRect;
  State: TOwnerDrawState);
var
  Bitmap: TBitmap;
  BmpWidth: Integer;
  Text: array[0..255] of Char;
begin
 if odSelected in State then
 begin
   frFontViewForm.FPanel.Caption:=self.Items[index];
   frFontViewForm.FPanel.Font.Name:=self.Items[index];
 end;
 with Canvas do
 begin
   BmpWidth  := 15;
   FillRect(Rect);
   if (Integer(Items.Objects[Index]) and TRUETYPE_FONTTYPE) <> 0 then
     Bitmap := FTrueTypeBMP
   else if (Integer(Items.Objects[Index]) and DEVICE_FONTTYPE) <> 0 then
     Bitmap := FDeviceBMP
   else
     Bitmap := nil;