如何去掉ComBobox的边框(50分)

如题！！正在开发一个控件，从TCustomComBobox继承而来，在线等候~~

BevelKind := bkFlat;

to wen00000000:
我要的是无边框

BevelInner := bvNone;
BevelKind := bkFlat;
BevelOuter := bvNone;
或者自画。

同意楼上的做法，不过BevelOuter可以设为bvraise，我感觉好看些

大家可能误会我的意思了，我是要自己开发控件，不是改Combobox的属性。
TO：wnjer
如何自画？？

也就是让它透明，但是下拉框按钮不透明。

有时间到我的网站看看吧！
http://BetterMicrosoft.icpcn.com

请参看
TCustomColorBox 的自画代码

很难吗？没人会？[][][]

提供一个思路你，我就是这样写过很多漂亮的控件。函数用法自己查MSDN。
用SetWindowRgn(..)函数，Rgn的面积设为去除边框的Rect

好像有个 属性 是 borderstyle , 设为none

unit TFlatComboBoxUnit;

interface

{$I DFS.inc}

uses
Windows, Messages, Classes, Forms, Controls, Graphics, StdCtrls, FlatUtilitys,
SysUtils, ShellApi, Commctrl, comctrls, Consts;

type
TFlatComboBox = class(TCustomComboBox)
private
fOriginColor: TColor;
FArrowColor: TColor;
FArrowBackgroundColor: TColor;
FBorderColor: TColor;
FUseAdvColors: Boolean;
FAdvColorArrowBackground: TAdvColors;
FAdvColorBorder: TAdvColors;
FFocusedColor: TColor; //add by major
FButtonWidth: Integer;
FChildHandle: HWND;
FDefListProc: Pointer;
FListHandle: HWND;
FListInstance: Pointer;
FSysBtnWidth: Integer;
FSolidBorder: Boolean;
procedure SetColors (Index: Integer; Value: TColor);
procedure SetAdvColors (Index: Integer; Value: TAdvColors);
procedure SetUseAdvColors (Value: Boolean);
function GetButtonRect: TRect;
procedure PaintButton;
procedure PaintBorder;
procedure RedrawBorders;
procedure InvalidateSelection;
function GetSolidBorder: Boolean;
procedure SetSolidBorder;
procedure ListWndProc (var Message: TMessage);
procedure WMSetFocus (var Message: TMessage); message WM_SETFOCUS;
procedure WMKillFocus (var Message: TMessage); message WM_KILLFOCUS;
procedure WMKeyDown (var Message: TMessage); message WM_KEYDOWN;
procedure WMPaint (var Message: TWMPaint); message WM_PAINT;
procedure WMNCPaint (var Message: TMessage); message WM_NCPAINT;
procedure CMEnabledChanged (var Msg: TMessage); message CM_ENABLEDCHANGED;
procedure CNCommand (var Message: TWMCommand); message CN_COMMAND;
procedure CMFontChanged (var Message: TMessage); message CM_FONTCHANGED;
procedure CMSysColorChange (var Message: TMessage); message CM_SYSCOLORCHANGE;
procedure CMParentColorChanged (var Message: TWMNoParams); message CM_PARENTCOLORCHANGED;
procedure CMEnter(var Message: TMessage); message CM_ENTER;
procedure CMExit(var Message: TMessage); message CM_exit;
procedure setOnlyDownLine(value:boolean);
protected
fOnlyDownLine:Boolean;
procedure CalcAdvColors;
procedure WndProc (var Message: TMessage); override;
procedure ComboWndProc (var Message: TMessage; ComboWnd: HWnd; ComboProc: Pointer); override;
property SolidBorder: Boolean read FSolidBorder;
public
constructor Create (AOwner: TComponent); override;
destructor Destroy; override;
published
property Style;
property OnlyDownLine:boolean read fOnlyDownLine write setOnlyDownLine;
property Color default $00E1EAEB;
property ColorArrow: TColor index 0 read FArrowColor write SetColors default clBlack;
property ColorArrowBackground: TColor index 1 read FArrowBackgroundColor write SetColors default $00C5D6D9;
property ColorBorder: TColor index 2 read FBorderColor write SetColors default $008396A0;
property ColorFocused: TColor index 3 read FFocusedColor write SetColors default clWhite;
property AdvColorBorder: TAdvColors index 0 read FAdvColorBorder write SetAdvColors default 50;
property AdvColorArrowBackground: TAdvColors index 1 read FAdvColorArrowBackground write SetAdvColors default 10;
property UseAdvColors: Boolean read FUseAdvColors write SetUseAdvColors default false;
property DragMode;
property DragCursor;
property DropDownCount;
property Enabled;
property Font;
property ItemHeight;
property Items;
property MaxLength;
property ParentFont;
property ParentShowHint;
property PopupMenu;
property ShowHint;
property Sorted;
property TabOrder;
property TabStop;
property Text;
property Visible;
property ItemIndex;
property OnChange;
property OnClick;
property OnDblClick;
property OnDragDrop;
property OnDragOver;
property OnDrawItem;
property OnDropDown;
property OnEndDrag;
property OnEnter;
property OnExit;
property OnKeyDown;
property OnKeyPress;
property OnKeyUp;
property OnMeasureItem;
property OnStartDrag;
{$IFDEF DFS_DELPHI_4_UP}
property Anchors;
property BiDiMode;
property Constraints;
property DragKind;
property ParentBiDiMode;
property OnEndDock;
property OnStartDock;
{$ENDIF}
end;

implementation

constructor TFlatComboBox.Create (AOwner: TComponent);
begin
inherited Create(AOwner);
ControlStyle := ControlStyle - [csFixedHeight] + [csOpaque];
TControlCanvas(Canvas).Control := self;
FButtonWidth := 11;
FSysBtnWidth := GetSystemMetrics(SM_CXVSCROLL);
FListInstance := MakeObjectInstance(ListWndProc);
FDefListProc := nil;
ItemHeight := 13;
FArrowColor := clBlack;
FArrowBackgroundColor := $00C5D6D9;
FBorderColor := $008396A0;
FFocusedColor:=clWhite;
FUseAdvColors := False;
FAdvColorBorder := 50;
FAdvColorArrowBackground := 10;
end;

destructor TFlatComboBox.Destroy;
begin
FreeObjectInstance(FListInstance);
inherited;
end;

procedure TFlatComboBox.SetColors (Index: Integer; Value: TColor);
begin
case Index of
0: FArrowColor := Value;
1: FArrowBackgroundColor := Value;
2: FBorderColor := Value;
3: FFocusedColor:= value;//add by major
end;
Invalidate;
end;

procedure TFlatComboBox.CalcAdvColors;
begin
if FUseAdvColors then
begin
FBorderColor := CalcAdvancedColor(TForm(Parent).Color, FBorderColor, FAdvColorBorder, darken);
FArrowBackgroundColor := CalcAdvancedColor(TForm(Parent).Color, FArrowBackgroundColor, FAdvColorArrowBackground, darken);
end;
end;

procedure TFlatComboBox.SetAdvColors (Index: Integer; Value: TAdvColors);
begin
case Index of
0: FAdvColorBorder := Value;
1: FAdvColorArrowBackground := Value;
end;
CalcAdvColors;
Invalidate;
end;

procedure TFlatComboBox.SetUseAdvColors (Value: Boolean);
begin
if Value <> FUseAdvColors then
begin
FUseAdvColors := Value;
CalcAdvColors;
Invalidate;
end;
end;

procedure TFlatComboBox.CMSysColorChange (var Message: TMessage);
begin
if FUseAdvColors then
CalcAdvColors;
Invalidate;
end;

procedure TFlatComboBox.CMParentColorChanged (var Message: TWMNoParams);
begin
if FUseAdvColors then
CalcAdvColors;
Invalidate;
end;

procedure TFlatComboBox.WndProc (var Message: TMessage);
begin
if (Message.Msg = WM_PARENTNOTIFY) then
case LoWord(Message.wParam) of
WM_CREATE:
if FDefListProc <> nil then
begin
SetWindowLong(FListHandle, GWL_WNDPROC, Longint(FDefListProc));
FDefListProc := nil;
FChildHandle := Message.lParam;
end
else
if FChildHandle = 0 then
FChildHandle := Message.lParam
else
FListHandle := Message.lParam;
end
else
if (Message.Msg = WM_WINDOWPOSCHANGING) then
if Style in [csDropDown, csSimple] then
SetWindowPos( EditHandle, 0,
0, 0, ClientWidth - FButtonWidth - 2 * 2 - 4, Height - 2 * 2 - 2,
SWP_NOMOVE + SWP_NOZORDER + SWP_NOACTIVATE + SWP_NOREDRAW);
inherited;
if Message.Msg = WM_CTLCOLORLISTBOX then
begin
SetBkColor(Message.wParam, ColorToRGB(Color));
Message.Result := CreateSolidBrush(ColorToRGB(Color));
end;
end;

procedure TFlatComboBox.ListWndProc (var Message: TMessage);
begin
case Message.Msg of
WM_WINDOWPOSCHANGING:
with TWMWindowPosMsg(Message).WindowPos^ do
begin
// size of the drop down list
if Style in [csDropDown, csDropDownList] then
cy := (GetFontHeight(Font)-2) * Min(DropDownCount, Items.Count) + 4
else
cy := (ItemHeight) * Min(DropDownCount, Items.Count) + 4;
if cy <= 4 then
cy := 10;
end;
else
with Message do
Result := CallWindowProc(FDefListProc, FListHandle, Msg, WParam, LParam);
end;
end;

procedure TFlatComboBox.ComboWndProc (var Message: TMessage; ComboWnd: HWnd; ComboProc: Pointer);
begin
inherited;
if (ComboWnd = EditHandle) then
case Message.Msg of
WM_SETFOCUS, WM_KILLFOCUS:
SetSolidBorder;
end;
end;

procedure TFlatComboBox.WMSetFocus (var Message: TMessage);
begin
inherited;
if not (csDesigning in ComponentState) then
begin
SetSolidBorder;
if not (Style in [csSimple, csDropDown]) then
InvalidateSelection;
end;
end;

procedure TFlatComboBox.WMKillFocus (var Message: TMessage);
begin
inherited;
if not (csDesigning in ComponentState) then
begin
SetSolidBorder;
if not (Style in [csSimple, csDropDown]) then
InvalidateSelection;
end;
end;

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

procedure TFlatComboBox.CNCommand (var Message: TWMCommand);
var
R: TRect;
begin
inherited;
if Message.NotifyCode in [1, 9, CBN_DROPDOWN, CBN_SELCHANGE] then
begin
if not (Style in [csSimple, csDropDown]) then
InvalidateSelection;
end;
if (Message.NotifyCode in [CBN_CLOSEUP]) then
begin
R := GetButtonRect;
Dec(R.Left, 2);
InvalidateRect(Handle, @R, FALSE);
end;
end;

procedure TFlatComboBox.WMKeyDown (var Message: TMessage);
var
S: String;
begin
S := Text;
inherited;
if not (Style in [csSimple, csDropDown]) and (Text <> S) then
InvalidateSelection;
end;

procedure TFlatComboBox.WMPaint (var Message: TWMPaint);
var
R: TRect;
DC: HDC;
PS: TPaintStruct;
begin
DC := BeginPaint(Handle, PS);
try
R := PS.rcPaint;
if R.Right > Width - FButtonWidth - 4 then
R.Right := Width - FButtonWidth - 4;
FillRect(DC, R, Brush.Handle);
if RectInRect(GetButtonRect, PS.rcPaint) then
PaintButton;
ExcludeClipRect(DC, ClientWidth - FSysBtnWidth - 2, 0, ClientWidth, ClientHeight);
PaintWindow(DC);
if (Style = csDropDown) and DroppedDown then
begin
R := ClientRect;
InflateRect(R, -2, -2);
R.Right := Width - FButtonWidth - 3;
Canvas.Brush.Color := clWindow;
Canvas.FrameRect(R);
end
else
if Style <> csDropDown then
InvalidateSelection;
finally
EndPaint(Handle, PS);
end;
RedrawBorders;
Message.Result := 0;
end;

procedure TFlatComboBox.WMNCPaint (var Message: TMessage);
begin
inherited;
RedrawBorders;
end;

procedure TFlatComboBox.CMFontChanged (var Message: TMessage);
begin
inherited;
ItemHeight := 13;
RecreateWnd;
end;

procedure TFlatComboBox.InvalidateSelection;
var
R: TRect;
begin
R := ClientRect;
InflateRect(R, -2, -3);
R.Left := R.Right - FButtonWidth - 8;
Dec(R.Right, FButtonWidth + 3);
if (GetFocus = Handle) and not DroppedDown then
Canvas.Brush.Color := clHighlight
else
Canvas.Brush.Color := Color;
Canvas.Brush.Style := bsSolid;
Canvas.FillRect(R);
if (GetFocus = Handle) and not DroppedDown then
begin
R := ClientRect;
InflateRect(R, -3, -3);
Dec(R.Right, FButtonWidth + 2);
Canvas.FrameRect(R);
Canvas.Brush.Color := clWindow;
end;
ExcludeClipRect(Canvas.Handle, ClientWidth - FSysBtnWidth - 2, 0, ClientWidth, ClientHeight);
end;

function TFlatComboBox.GetButtonRect: TRect;
begin
GetWindowRect(Handle, Result);
OffsetRect(Result, -Result.Left, -Result.Top);
Inc(Result.Left, ClientWidth - FButtonWidth);
OffsetRect(Result, -1, 0);
end;

procedure TFlatComboBox.PaintButton;
var
R: TRect;
x, y: Integer;
begin
R := GetButtonRect;
InflateRect(R, 1, 0);

Canvas.Brush.Color := FArrowBackgroundColor;
Canvas.FillRect(R);
Canvas.Brush.Color := FBorderColor;
{ if fOnlyDownLine then
begin
Canvas.pen.Color:=FBorderColor;
Canvas.MoveTo(R.Left, R.Top);
Canvas.LineTo(R.Right,R.Top);
end else }
Canvas.FrameRect(R);

x := (R.Right - R.Left) div 2 - 6 + R.Left;
if DroppedDown then
y := (R.Bottom - R.Top) div 2 - 1 + R.Top
else
y := (R.Bottom - R.Top) div 2 - 1 + R.Top;

if Enabled then
begin
canvas.Brush.Color := FArrowColor;
canvas.Pen.Color := FArrowColor;
if DroppedDown then
canvas.Polygon([Point(x + 4, y + 2), Point(x + 8, y + 2), Point(x + 6, y)])
else
canvas.Polygon([Point(x + 4, y), Point(x + 8, y), Point(x + 6, y + 2)]);
end
else
begin
canvas.Brush.Color := clWhite;
canvas.Pen.Color := clWhite;
Inc(x); Inc;
if DroppedDown then
canvas.Polygon([Point(x + 4, y + 2), Point(x + 8, y + 2), Point(x + 6, y)])
else
canvas.Polygon([Point(x + 4, y), Point(x + 8, y), Point(x + 6, y + 2)]);
Dec(x); Dec;
canvas.Brush.Color := clGray;
canvas.Pen.Color := clGray;
if DroppedDown then
canvas.Polygon([Point(x + 4, y + 2), Point(x + 8, y + 2), Point(x + 6, y)])
else
canvas.Polygon([Point(x + 4, y), Point(x + 8, y), Point(x + 6, y + 2)]);
end;
ExcludeClipRect(Canvas.Handle, ClientWidth - FSysBtnWidth, 0, ClientWidth, ClientHeight);
end;

procedure TFlatComboBox.PaintBorder;
var
DC: HDC;
R: TRect;
BtnFaceBrush, WindowBrush: HBRUSH;
begin
DC := GetWindowDC(Handle);

GetWindowRect(Handle, R);
OffsetRect(R, -R.Left, -R.Top);
Dec(R.Right, FButtonWidth + 1);
try
BtnFaceBrush := CreateSolidBrush(ColorToRGB(FBorderColor));
WindowBrush := CreateSolidBrush(ColorToRGB(Color));

InflateRect(R, 0, 0);
frameRect(DC, R, WindowBrush);

{modified by major 2004-3-12}
if fOnlyDownLine then
FrameRect(DC, Rect(R.left,R.Bottom-1,R.Right,R.Bottom), BtnFaceBrush)
else
FrameRect(DC, R, BtnFaceBrush);
{modified by major 2004-3-12}

InflateRect(R, -1, -1);
FrameRect(DC, R, WindowBrush);
InflateRect(R, -1, -1);
FrameRect(DC, R, WindowBrush);
finally
ReleaseDC(Handle, DC);
end;
DeleteObject(WindowBrush);
DeleteObject(BtnFaceBrush);
end;

function TFlatComboBox.GetSolidBorder: Boolean;
begin
Result := ( (csDesigning in ComponentState) and Enabled) or
(not(csDesigning in ComponentState) and
(DroppedDown or (GetFocus = Handle) or (GetFocus = EditHandle)) );
end;

procedure TFlatComboBox.SetSolidBorder;
var
sb: Boolean;
begin
sb := GetSolidBorder;
if sb <> FSolidBorder then
begin
FSolidBorder := sb;
RedrawBorders;
end;
end;

procedure TFlatComboBox.RedrawBorders;
begin
PaintBorder;
if Style <> csSimple then
PaintButton;
end;

procedure TFlatComboBox.setOnlyDownLine(value: boolean);
begin
fOnlyDownLine:=value;
Invalidate;
end;

procedure TFlatComboBox.CMEnter(var Message: TMessage);
begin
inherited;
fOriginColor:=color;
color:=FFocusedColor;
end;

procedure TFlatComboBox.CMExit(var Message: TMessage);
begin
inherited;
color:=fOriginColor;
end;

end.



来自：majorsoft, 时间：2004-3-12 15:13:30, ID：2499510 | 编辑
关键的地方:

procedure TFlatComboBox.PaintBorder;
var
DC: HDC;
R: TRect;
BtnFaceBrush, WindowBrush: HBRUSH;
begin
DC := GetWindowDC(Handle);

GetWindowRect(Handle, R);
OffsetRect(R, -R.Left, -R.Top);
Dec(R.Right, FButtonWidth + 1);
try
BtnFaceBrush := CreateSolidBrush(ColorToRGB(FBorderColor));
WindowBrush := CreateSolidBrush(ColorToRGB(Color));

InflateRect(R, 0, 0);
frameRect(DC, R, WindowBrush);

{modified by major 2004-3-12}
if fOnlyDownLine then
FrameRect(DC, Rect(R.left,R.Bottom-1,R.Right,R.Bottom), BtnFaceBrush)
else
FrameRect(DC, R, BtnFaceBrush);
{modified by major 2004-3-12}

InflateRect(R, -1, -1);
FrameRect(DC, R, WindowBrush);
InflateRect(R, -1, -1);
FrameRect(DC, R, WindowBrush);
finally
ReleaseDC(Handle, DC);
end;
DeleteObject(WindowBrush);
DeleteObject(BtnFaceBrush);
end;

Flat化之后的FlatDateTimePicker(可以用，但不够完善)
unit FlatDtPicker;

interface

uses
Windows, Messages, SysUtils, Classes, Controls, ComCtrls, Graphics;

type
TFlatDtPicker = class(TDateTimePicker)
private
procedure setOnlyDownLine(const Value: boolean);
protected
fOnlyDownLine:Boolean;
FBorderColor:TColor;
FFlatColor:TColor;
procedure RedrawBorder(const Clip: HRGN);
procedure SetColors(Index: Integer; Value: TColor);
public
procedure WMNCPaint (var Message: TMessage); message WM_NCPAINT;
constructor create(AOwner:TComponent);override;
published
property OnlyDownLine:boolean read fOnlyDownLine write setOnlyDownLine;
property ColorBorder:TColor index 0 read FBorderColor write SetColors default $008396A0;
property ColorFlat:TColor index 1 read FFlatColor write SetColors default $00E1EAEB;
end;

procedure Register;

implementation

procedure Register;
begin
RegisterComponents('MA', [TFlatDtPicker]);
end;

{ TFlatDtPicker }

{ TFlatDtPicker }

constructor TFlatDtPicker.create(AOwner: TComponent);
begin
inherited;
FBorderColor:=$008396A0;
FFlatColor:=$00E1EAEB;
end;

procedure TFlatDtPicker.RedrawBorder(const Clip: HRGN);
var
DC: HDC;
R: TRect;
BtnFaceBrush, WindowBrush, FocusBrush: HBRUSH;
begin
DC := GetWindowDC(Handle);
try
GetWindowRect(Handle, R);
OffsetRect(R, -R.Left, -R.Top);
BtnFaceBrush := CreateSolidBrush(ColorToRGB(FBorderColor));
WindowBrush := CreateSolidBrush(ColorToRGB(FFlatColor));

InflateRect(R, 0, 0);
FrameRect(DC, R, FocusBrush);

if fOnlyDownLine then
FrameRect(DC, Rect(R.left,R.Bottom-1,R.Right,R.Bottom), BtnFaceBrush)
else
FrameRect(DC, R, BtnFaceBrush);

InflateRect(R, -1, -1);
FrameRect(DC, R, FocusBrush);
InflateRect(R, -1, -1);
FrameRect(DC, R, FocusBrush);
finally
ReleaseDC(Handle, DC);
end;
DeleteObject(WindowBrush);
DeleteObject(BtnFaceBrush);
end;

procedure TFlatDtPicker.SetColors(Index: Integer; Value: TColor);
begin
case Index of
0: FBorderColor := Value;
1: FFlatColor := Value;
end;
RedrawBorder(0);
end;

procedure TFlatDtPicker.setOnlyDownLine(const Value: boolean);
begin
fOnlyDownLine := Value;
end;

procedure TFlatDtPicker.WMNCPaint(var Message: TMessage);
begin
inherited;
RedrawBorder(HRGN(Message.WParam));
end;

end.

下载一个faltstyle控件看看人家的UNIT

哈哈，上面的就是我在faltstyle基础上改的

推荐两个现有的combo产品，希望对你有些帮助：
WebCombo(.NET): http://www.evget.com/view/viewProductInfo.asp?productId=92
能够控制大数据量的dropdown方式的显示，并能自动获取数据而不需要提交表单

itCombo(ActiveX控件): http://www.evget.com/view/viewProductInfo.asp?productId=109
号称全球速度最快的combo控件

需要自己画，
procedure TFlatComboBox.PaintBorder;
var
DC: HDC;
R: TRect;
BtnFaceBrush, WindowBrush: HBRUSH;
begin
DC := GetWindowDC(Handle);

GetWindowRect(Handle, R);
OffsetRect(R, -R.Left, -R.Top);
Dec(R.Right, FButtonWidth + 1);
try
BtnFaceBrush := CreateSolidBrush(ColorToRGB(FBorderColor));
WindowBrush := CreateSolidBrush(ColorToRGB(Color));

InflateRect(R, 0, 0);
frameRect(DC, R, WindowBrush);

{modified by major 2004-3-12}
if fOnlyDownLine then
FrameRect(DC, Rect(R.left,R.Bottom-1,R.Right,R.Bottom), BtnFaceBrush)
else
FrameRect(DC, R, BtnFaceBrush);
{modified by major 2004-3-12}

InflateRect(R, -1, -1);
FrameRect(DC, R, WindowBrush);
InflateRect(R, -1, -1);
FrameRect(DC, R, WindowBrush);
finally
ReleaseDC(Handle, DC);
end;
DeleteObject(WindowBrush);
DeleteObject(BtnFaceBrush);
end;

修改一下就可以用了。

安装ExpressQuantumGrid 4 Suite的后,启动DELPHI6的时候提示"无法定位程序入口@variant@...@findVarData@.....@variant",进入后,发现ExpressQuantumGrid 4 Suite并没有安装成功,这是为什么? 请求指教