TScrollBar 滚动条

老式滚动条，用处还是不少的。

1. 添加控件

   

2. 控件属性

   

   

3. 运行效果

   

4. 示例代码

   1. procedure TForm1.ScrollBar1Change(Sender: TObject);
      begin
        Edit1.Text:= ScrollBar1.Position.ToString;
      end;
      

1. 补充

一下内容转载自：https://www.cnblogs.com/guorongtao/p/11880391.html

DELPHI的滚动条默认发送消息格式：

function TControl.Perform( Msg: Cardinal; WParam: WPARAM; LParam: LPARAM ): LRESULT; 如：Memo1.Perform(WM_HSCROLL, SB_LEFT, 0);

水平滚动条 消息 WM_HSCROLL SendMessage(Memo1.Handle, WM_HSCROLL, MAKEWPARAM(SB_THUMBPOSITION, 50), 0); //滚动至此 SendMessage(Memo1.Handle, WM_HSCROLL, SB_LEFT, 0); //左边缘 SendMessage(Memo1.Handle, WM_HSCROLL, SB_RIGHT, 0); //右边缘 SendMessage(Memo1.Handle, WM_HSCROLL, SB_PAGELEFT, 0); //向左翻页 SendMessage(Memo1.Handle, WM_HSCROLL, SB_PAGERIGHT, 0); //向右翻页 SendMessage(Memo1.Handle, WM_HSCROLL, SB_LINELEFT, 0); //向左滚动 SendMessage(Memo1.Handle, WM_HSCROLL, SB_LINERIGHT, 0); //向右滚动

垂直滚动条 消息 WM_VSCROLL SendMessage(Memo1.Handle, WM_VSCROLL, MAKEWPARAM(SB_THUMBPOSITION, 50), 0); //滚动至此 50为位置 滚动到指定行号 SendMessage(Memo1.Handle, WM_VSCROLL, SB_TOP, 0); //顶部 SendMessage(Memo1.Handle, WM_VSCROLL, SB_BOTTOM, 0); //底部 SendMessage(Memo1.Handle, WM_VSCROLL, SB_PAGEUP, 0); //向上翻页 SendMessage(Memo1.Handle, WM_VSCROLL, SB_PAGEDOWN, 0); //向下翻页 SendMessage(Memo1.Handle, WM_VSCROLL, SB_LINEUP, 0); //向上滚动 SendMessage(Memo1.Handle, WM_VSCROLL, SB_LINEDOWN, 0); //向下滚动

//获得滚动条的位置 The GetScrollPos function retrieves the current position of the scroll box (thumb) in the specified scroll bar. The current position is a relative value that depends on the current scrolling range. For example, if the scrolling range is 0 through 100 and the scroll box is in the middle of the bar, the current position is 50.

{GetScrollPos函数检索指定滚动条中滚动框（拇指）的当前位置。当前位置是一个相对值，取决于当前滚动范围。 例如，如果滚动范围为0到100，并且滚动框位于条的中间，则当前位置为50。}

int GetScrollPos( HWND hWnd, int nBar ); var h, v: Integer; begin h := GetScrollPos(Memo1.Handle, SB_HORZ); v := GetScrollPos(Memo1.Handle, SB_VERT); Caption := Format('水平数值=%d 垂直数值=%d', [h, v]); end;

//显示和隐藏滚动条 ShowScrollBar(Memo1.Handle,SB_HORZ,false); //隐藏MEMO水平滚动条 ShowScrollBar(Memo1.Handle,SB_VERT,false); //隐藏MEMO垂直滚动条

//判断 滚动条是否出现 procedure TForm1.Button1Click(Sender: TObject); begin if (GetWindowlong(Memo1.Handle, GWL_STYLE) and WS_VSCROLL) > 0 then ShowMessage('垂直滚动条显示'); if (GetWindowlong(Memo1.Handle, GWL_STYLE) and WS_HSCROLL) > 0 then ShowMessage('水平滚动条显示'); end;