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Delphi 滚动条的使用介绍 1、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);
2、水平/垂直滚动条: 2.1 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
2.2 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
3、获得滚动条的位置(GetScrollPos函数) 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。 int GetScrollPos(
HWND hWnd,
int nBar
);
示例: 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;
4、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
5、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;
创建时间:2019.11.18 更新时间:2020.05.18
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