105 lines
3.6 KiB
C#
105 lines
3.6 KiB
C#
/******************************************************************************
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* SunnyUI 开源控件库、工具类库、扩展类库、多页面开发框架。
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* CopyRight (C) 2012-2022 ShenYongHua(沈永华).
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* QQ群：56829229 QQ：17612584 EMail：SunnyUI@QQ.Com
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*
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* Blog: https://www.cnblogs.com/yhuse
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* Gitee: https://gitee.com/yhuse/SunnyUI
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* GitHub: https://github.com/yhuse/SunnyUI
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*
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* SunnyUI.dll can be used for free under the GPL-3.0 license.
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* If you use this code, please keep this note.
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* 如果您使用此代码，请保留此说明。
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******************************************************************************
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* 文件名称: UScrollBarInfo.cs
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* 文件说明: 滚动条信息获取类
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* 当前版本: V3.1
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* 创建日期: 2020-01-01
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*
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* 2020-01-01: V2.2.0 增加文件说明
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******************************************************************************/
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using Sunny.UI.Win32;
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using System;
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using System.Runtime.InteropServices;
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using System.Windows.Forms;
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namespace Sunny.UI
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{
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public static class ScrollBarInfo
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{
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public const int SIF_RANGE = 1;
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public const int SIF_PAGE = 2;
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public const int SIF_POS = 4;
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public const int SIF_TRACKPOS = 16;
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public const int SIF_DISABLENOSCROLL = 8;
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public const int SIF_ALL = SIF_RANGE | SIF_PAGE | SIF_POS | SIF_TRACKPOS;
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//私有方法
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private static uint MakeLong(short lowPart, short highPart)
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{
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return (ushort)lowPart | (uint)(highPart << 16);
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}
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public static int VerticalScrollBarWidth()
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{
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return SystemInformation.VerticalScrollBarWidth;
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}
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public static int HorizontalScrollBarHeight()
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{
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return SystemInformation.HorizontalScrollBarHeight;
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}
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/// <summary>
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/// 获取控件滚动条信息
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/// </summary>
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/// <param name="handle">控件句柄</param>
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/// <returns>信息结构</returns>
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public static SCROLLINFO GetInfo(IntPtr handle)
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{
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SCROLLINFO si = new SCROLLINFO();
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si.cbSize = Marshal.SizeOf(si);
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si.fMask = SIF_DISABLENOSCROLL | SIF_ALL;
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User.GetScrollInfo(handle, User.SB_VERT, ref si);
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return si;
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}
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/// <summary>
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/// 设置控件滚动条滚动值
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/// </summary>
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/// <param name="handle">控件句柄</param>
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/// <param name="value">滚动值</param>
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public static void SetScrollValue(IntPtr handle, int value)
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{
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SCROLLINFO info = GetInfo(handle);
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info.nPos = value;
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User.SetScrollInfo(handle, User.SB_VERT, ref info, true);
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User.PostMessage(handle, User.WM_VSCROLL, MakeLong(User.SB_THUMBTRACK, highPart: (short)info.nPos), 0);
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}
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/// <summary>
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/// 控件向上滚动一个单位
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/// </summary>
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/// <param name="handle">控件句柄</param>
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public static void ScrollUp(IntPtr handle)
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{
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User.SendMessage(handle, User.WM_VSCROLL, User.SB_LINEUP, 0);
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}
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/// <summary>
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/// 控件向下滚动一个单位
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/// </summary>
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/// <param name="handle">控件句柄</param>
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public static void ScrollDown(IntPtr handle)
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{
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User.SendMessage(handle, User.WM_VSCROLL, User.SB_LINEDOWN, 0);
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}
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public static bool IsVerticalScrollBarVisible(Control ctrl)
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{
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if (!ctrl.IsHandleCreated) return false;
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return (Sunny.UI.Win32.User.GetWindowLong(ctrl.Handle, User.GWL_STYLE) & User.WS_VSCROLL) != 0;
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}
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}
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} |