知识大全重绘的滚动条控制ListBox的滚动

Posted 2022-07-17 知

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　　查了很多资料都找不到直接重写ListBox滚动条的方法只能曲线救国先自己重绘一个带皮肤的滚动条然后让它取代ListBox现有的滚动条老习惯先传个效果图你觉得感兴趣就继续看下去不喜欢的话就此打住懒得耽误你宝贵的时间嘿嘿

　　注意此图中的滚动条宽度明显小于ListBox本身滚动条的宽度我目前只顾着实现功能了毕竟宽度调整相当简单哈

　　下面简单介绍下重绘系统滚动条的详细步骤:

　　在项目中添加新项用户控件我们命名为CustomScrollbar cs

　　准备几张图片添加进项目资源作为滚动条重绘时要用的背景我用的图片如下:

　　uparrow png资源名称为uparrow 滚动条的上箭头

　　ThumbBottom png资源名称为ThumbBottom 滚动条中间滑道的背景

　　ThumbMiddle png资源名称为ThumbMiddle 滚动条的中间的拖动块

　　downarrow png资源名称为downarrow 滚动条的下箭头

　　然后就是利用上面图片做背景重画滚动条背景了直接给出CustomScrollbar cs的代码吧Codeusing System;using System Collections Generic;using System ComponentModel;using System Drawing;using System Data;using System Text;using System Windows Forms;using System Windows Forms Design;using System Diagnostics;namespace Winamp [Designer(typeof(ScrollbarControlDesigner))] public partial class CustomScrollbar : UserControl

　　protected Color moChannelColor = Color Empty; protected Image moUpArrowImage = null;//上箭头 //protected Image moUpArrowImage_Over = null; //protected Image moUpArrowImage_Down = null; protected Image moDownArrowImage = null;//下箭头 //protected Image moDownArrowImage_Over = null; //protected Image moDownArrowImage_Down = null; protected Image moThumbArrowImage = null;

　　protected Image moThumbTopImage = null; protected Image moThumbTopSpanImage = null; protected Image moThumbBottomImage = null; protected Image moThumbBottomSpanImage = null; protected Image moThumbMiddleImage = null;

　　protected int moLargeChange = ; protected int moSmallChange = ; protected int moMinimum = ; protected int moMaximum = ; protected int moValue = ; private int nClickPoint;

　　protected int moThumbTop = ;

　　protected bool moAutoSize = false;

　　private bool moThumbDown = false; private bool moThumbDragging = false;

　　public new event EventHandler Scroll = null; public event EventHandler ValueChanged = null;

　　private int GetThumbHeight() int nTrackHeight = (this Height (UpArrowImage Height + DownArrowImage Height)); float fThumbHeight = ((float)LargeChange / (float)Maximum) * nTrackHeight; int nThumbHeight = (int)fThumbHeight;

　　if (nThumbHeight > nTrackHeight) nThumbHeight = nTrackHeight; fThumbHeight = nTrackHeight; if (nThumbHeight < ) nThumbHeight = ; fThumbHeight = ;

　　return nThumbHeight;

　　public CustomScrollbar()

　　InitializeComponent(); SetStyle(ControlStyles ResizeRedraw true); SetStyle(ControlStyles AllPaintingInWmPaint true); SetStyle(ControlStyles DoubleBuffer true);

　　moChannelColor = Color FromArgb( ); UpArrowImage = BASSSkin uparrow;//上箭头 DownArrowImage = BASSSkin downarrow;//下肩头

　　ThumbBottomImage = BASSSkin ThumbBottom;

　　ThumbMiddleImage = BASSSkin ThumbMiddle;

　　this Width = UpArrowImage Width;// px base MinimumSize = new Size(UpArrowImage Width UpArrowImage Height + DownArrowImage Height + GetThumbHeight());

　　[EditorBrowsable(EditorBrowsableState Always) Browsable(true) DefaultValue(false) Category( Behavior ) Description( LargeChange )] public int LargeChange get return moLargeChange; set moLargeChange = value; Invalidate();

　　[EditorBrowsable(EditorBrowsableState Always) Browsable(true) DefaultValue(false) Category( Behavior ) Description( SmallChange )] public int SmallChange get return moSmallChange; set moSmallChange = value; Invalidate();

　　[EditorBrowsable(EditorBrowsableState Always) Browsable(true) DefaultValue(false) Category( Behavior ) Description( Minimum )] public int Minimum get return moMinimum; set moMinimum = value; Invalidate();

　　[EditorBrowsable(EditorBrowsableState Always) Browsable(true) DefaultValue(false) Category( Behavior ) Description( Maximum )] public int Maximum get return moMaximum; set moMaximum = value; Invalidate();

　　[EditorBrowsable(EditorBrowsableState Always) Browsable(true) DefaultValue(false) Category( Behavior ) Description( Value )] public int Value get return moValue; set moValue = value;

　　int nTrackHeight = (this Height (UpArrowImage Height + DownArrowImage Height)); float fThumbHeight = ((float)LargeChange / (float)Maximum) * nTrackHeight; int nThumbHeight = (int)fThumbHeight;

　　if (nThumbHeight > nTrackHeight) nThumbHeight = nTrackHeight; fThumbHeight = nTrackHeight; if (nThumbHeight < ) nThumbHeight = ; fThumbHeight = ;

　　//figure out value int nPixelRange = nTrackHeight nThumbHeight; int nRealRange = (Maximum Minimum) LargeChange; float fPerc = f; if (nRealRange != ) fPerc = (float)moValue / (float)nRealRange;

　　float fTop = fPerc * nPixelRange; moThumbTop = (int)fTop;

　　Invalidate();

　　[EditorBrowsable(EditorBrowsableState Always) Browsable(true) DefaultValue(false) Category( Skin ) Description( Channel Color )] public Color ChannelColor get return moChannelColor; set moChannelColor = value;

　　[EditorBrowsable(EditorBrowsableState Always) Browsable(true) DefaultValue(false) Category( Skin ) Description( Up Arrow Graphic )] public Image UpArrowImage get return moUpArrowImage; set moUpArrowImage = value;

　　[EditorBrowsable(EditorBrowsableState Always) Browsable(true) DefaultValue(false) Category( Skin ) Description( Up Arrow Graphic )] public Image DownArrowImage get return moDownArrowImage; set moDownArrowImage = value;

　　[EditorBrowsable(EditorBrowsableState Always) Browsable(true) DefaultValue(false) Category( Skin ) Description( Up Arrow Graphic )] public Image ThumbBottomImage get return moThumbBottomImage; set moThumbBottomImage = value;

　　[EditorBrowsable(EditorBrowsableState Always) Browsable(true) DefaultValue(false) Category( Skin ) Description( Up Arrow Graphic )] public Image ThumbMiddleImage get return moThumbMiddleImage; set moThumbMiddleImage = value;

　　protected override void OnPaint(PaintEventArgs e)

　　e Graphics InterpolationMode = System Drawing Drawing D InterpolationMode NearestNeighbor;

　　if (UpArrowImage != null) e Graphics DrawImage(UpArrowImage new Rectangle(new Point( ) new Size(this Width UpArrowImage Height)));

　　Brush oBrush = new SolidBrush(moChannelColor); Brush oWhiteBrush = new SolidBrush(Color FromArgb( )); // 函数名: rectangle //功能: 画一个矩形 //用法: void far rectangle(int left int top int right int bottom);

　　//draw channel left and right border colors e Graphics FillRectangle(oWhiteBrush new Rectangle( UpArrowImage Height (this Height DownArrowImage Height))); e Graphics FillRectangle(oWhiteBrush new Rectangle(this Width UpArrowImage Height (this Height DownArrowImage Height)));

　　//draw channel //e Graphics FillRectangle(oBrush new Rectangle( UpArrowImage Height this Width (this Height DownArrowImage Height))); e Graphics DrawImage(ThumbBottomImage new Rectangle( UpArrowImage Height this Width (this Height DownArrowImage Height))); //draw thumb int nTrackHeight = (this Height (UpArrowImage Height + DownArrowImage Height)); float fThumbHeight = ((float)LargeChange / (float)Maximum) * nTrackHeight; int nThumbHeight = (int)fThumbHeight;

　　if (nThumbHeight > nTrackHeight) nThumbHeight = nTrackHeight; fThumbHeight = nTrackHeight; //MessageBox Show(nThumbHeight ToString()); if (nThumbHeight < ) nThumbHeight = ; fThumbHeight = ;

　　//Debug WriteLine(nThumbHeight ToString());

　　//float fSpanHeight = (fThumbHeight (ThumbMiddleImage Height + ThumbTopImage Height + ThumbBottomImage Height)) / f; //int nSpanHeight = (int)fSpanHeight;

　　int nTop = moThumbTop;// nTop += UpArrowImage Height;// px

　　//draw top画上面的按钮 //e Graphics DrawImage(ThumbTopImage new Rectangle( nTop this Width ThumbTopImage Height));

　　//nTop += ThumbTopImage Height;// px //draw top span //Rectangle rect = new Rectangle( nTop this Width nSpanHeight);

　　//e Graphics DrawImage(ThumbTopSpanImage f (float)nTop (float)this Width f (float) fSpanHeight* );

　　// nTop += nSpanHeight;// px //draw middle e Graphics DrawImage(ThumbMiddleImage new Rectangle( nTop this Width ThumbMiddleImage Height));

　　//nTop += ThumbMiddleImage Height; //draw top span //rect = new Rectangle( nTop this Width nSpanHeight* ); //e Graphics DrawImage(ThumbBottomSpanImage rect);

　　//nTop += nSpanHeight; //draw bottom //e Graphics DrawImage(ThumbBottomImage new Rectangle( nTop this Width nSpanHeight));

　　if (DownArrowImage != null) e Graphics DrawImage(DownArrowImage new Rectangle(new Point( (this Height DownArrowImage Height)) new Size(this Width DownArrowImage Height)));

　　public override bool AutoSize get return base AutoSize; set base AutoSize = value; if (base AutoSize) this Width = moUpArrowImage Width;

　　private void InitializeComponent() this SuspendLayout(); // // CustomScrollbar // this Name = CustomScrollbar ; this MouseDown += new System Windows Forms MouseEventHandler(this CustomScrollbar_MouseDown); this MouseMove += new System Windows Forms MouseEventHandler(this CustomScrollbar_MouseMove); this MouseUp += new System Windows Forms MouseEventHandler(this CustomScrollbar_MouseUp); this ResumeLayout(false);

　　private void CustomScrollbar_MouseDown(object sender MouseEventArgs e) Point ptPoint = this PointToClient(Cursor Position); int nTrackHeight = (this Height (UpArrowImage Height + DownArrowImage Height)); float fThumbHeight = ((float)LargeChange / (float)Maximum) * nTrackHeight; int nThumbHeight = (int)fThumbHeight;

　　if (nThumbHeight > nTrackHeight) nThumbHeight = nTrackHeight; fThumbHeight = nTrackHeight; if (nThumbHeight < ) nThumbHeight = ; fThumbHeight = ;

　　int nTop = moThumbTop; nTop += UpArrowImage Height;

　　Rectangle thumbrect = new Rectangle(new Point( nTop) new Size(ThumbMiddleImage Width nThumbHeight)); if (thumbrect Contains(ptPoint))

　　//hit the thumb nClickPoint = (ptPoint Y nTop); //MessageBox Show(Convert ToString((ptPoint Y nTop))); this moThumbDown = true;

　　Rectangle uparrowrect = new Rectangle(new Point( ) new Size(UpArrowImage Width UpArrowImage Height)); if (uparrowrect Contains(ptPoint))

　　int nRealRange = (Maximum Minimum) LargeChange; int nPixelRange = (nTrackHeight nThumbHeight); if (nRealRange > ) if (nPixelRange > ) if ((moThumbTop SmallChange) < ) moThumbTop = ; else moThumbTop = SmallChange;

　　//figure out value float fPerc = (float)moThumbTop / (float)nPixelRange; float fValue = fPerc * (Maximum LargeChange);

　　moValue = (int)fValue; Debug WriteLine(moValue ToString());

　　if (ValueChanged != null) ValueChanged(this new EventArgs());

　　if (Scroll != null) Scroll(this new EventArgs());

　　Invalidate();

　　Rectangle downarrowrect = new Rectangle(new Point( UpArrowImage Height + nTrackHeight) new Size(UpArrowImage Width UpArrowImage Height)); if (downarrowrect Contains(ptPoint)) int nRealRange = (Maximum Minimum) LargeChange; int nPixelRange = (nTrackHeight nThumbHeight); if (nRealRange > ) if (nPixelRange > ) if ((moThumbTop + SmallChange) > nPixelRange) moThumbTop = nPixelRange; else moThumbTop += SmallChange;

　　//figure out value float fPerc = (float)moThumbTop / (float)nPixelRange; float fValue = fPerc * (Maximum LargeChange);

　　moValue = (int)fValue; Debug WriteLine(moValue ToString());

　　if (ValueChanged != null) ValueChanged(this new EventArgs());

　　if (Scroll != null) Scroll(this new EventArgs());

　　Invalidate();

　　private void CustomScrollbar_MouseUp(object sender MouseEventArgs e) this moThumbDown = false; this moThumbDragging = false;

　　private void MoveThumb(int y) int nRealRange = Maximum Minimum; int nTrackHeight = (this Height (UpArrowImage Height + DownArrowImage Height)); float fThumbHeight = ((float)LargeChange / (float)Maximum) * nTrackHeight; int nThumbHeight = (int)fThumbHeight;

　　if (nThumbHeight > nTrackHeight) nThumbHeight = nTrackHeight; fThumbHeight = nTrackHeight; if (nThumbHeight < ) nThumbHeight = ; fThumbHeight = ;

　　int nSpot = nClickPoint;

　　int nPixelRange = (nTrackHeight nThumbHeight); if (moThumbDown && nRealRange > ) if (nPixelRange > ) int nNewThumbTop = y (UpArrowImage Height + nSpot);

　　if (nNewThumbTop < ) moThumbTop = nNewThumbTop = ; else if (nNewThumbTop > nPixelRange) moThumbTop = nNewThumbTop = nPixelRange; else moThumbTop = y (UpArrowImage Height + nSpot);

　　//figure out value float fPerc = (float)moThumbTop / (float)nPixelRange; float fValue = fPerc * (Maximum LargeChange); moValue = (int)fValue; Debug WriteLine(moValue ToString());

　　Application DoEvents();

　　Invalidate();

　　private void CustomScrollbar_MouseMove(object sender

　　MouseEventArgs e) if (moThumbDown == true) this moThumbDragging = true;

　　if (this moThumbDragging)

　　MoveThumb(e Y);

　　if (ValueChanged != null) ValueChanged(this new EventArgs());

　　if (Scroll != null) Scroll(this new EventArgs());

　　internal class ScrollbarControlDesigner : System Windows Forms Design ControlDesigner

　　public override SelectionRules SelectionRules get SelectionRules selectionRules = base SelectionRules; PropertyDescriptor propDescriptor = TypeDescriptor GetProperties(this Component)[ AutoSize ]; if (propDescriptor != null) bool autoSize = (bool)propDescriptor GetValue(this Component); if (autoSize) selectionRules = SelectionRules Visible | SelectionRules Moveable | SelectionRules BottomSizeable | SelectionRules TopSizeable; else selectionRules = SelectionRules Visible | SelectionRules AllSizeable | SelectionRules Moveable; return selectionRules; 目前只想简单实现滚动条中上箭头/下箭头/滑道/拖动块的重写所以以上代码中OnPaint函数里的部分内容被我注释了好了这个滚动条控件已经做好了一个控件而已你应该会使用它我就不罗嗦了

　　接下来就是怎么用它来控制ListBox的内容滚动的问题了这需要调用API函数来实现同时又不能设置ListBox无滚动条因为ListBox没有滚动条也就没有滚动的事件可捕获那就达不到滚动的效果了

　　在你的窗体里拖一个listbox控件和一个上边我们制作好的用户控件分明命名为listBox和customScrollbar

　　然后往listBox中随便多弄写内容使之出现滚动条即可调整customScrollbar 的位置使之覆蓋在listBox的滚动条上呵呵这方法不错吧？

　　然后我们定义一下Win API 代码如下

　　Codepublic class Win API [StructLayout(LayoutKind Sequential)] public struct tagSCROLLINFO public uint cbSize; public uint fMask; public int nMin; public int nMax; public uint nPage; public int nPos; public int nTrackPos; public enum fnBar SB_HORZ = SB_VERT = SB_CTL = public enum fMask SIF_ALL SIF_DISABLENOSCROLL = X SIF_PAGE = X SIF_POS = X SIF_RANGE = X SIF_TRACKPOS = X

　　public static int MakeLong(short lowPart short highPart) return (int)(((ushort)lowPart) | (uint)(highPart << )); public const int SB_THUMBTRACK = ; public const int WM_HSCROLL = x ; public const int WM_VSCROLL = x ; [DllImport( user dll EntryPoint = GetScrollInfo )] public static extern bool GetScrollInfo(IntPtr hwnd int fnBar ref SCROLLINFO lpsi); [DllImport( user dll EntryPoint = SetScrollInfo )] public static extern int SetScrollInfo(IntPtr hwnd int fnBar [In] ref SCROLLINFO lpsi bool fRedraw);

　　[DllImport( User dll CharSet = CharSet Auto EntryPoint = SendMessage )] static extern IntPtr SendMessage(IntPtr hWnd uint Msg IntPtr wParam IntPtr lParam); [DllImport( user dll SetLastError = true)] public static extern bool PostMessage(IntPtr hWnd uint Msg long wParam int lParam);

public struct SCROLLINFO public uint cbSize; public uint fMask; public int nMin; public int nMax; public uint nPage; public int nPos; public int nTrackPos; enum ScrollInfoMask SIF_RANGE = x SIF_PAGE = x SIF_POS = x SIF_DISABLENOSCROLL = x SIF_TRACKPOS = x SIF_ALL = SIF_RANGE + SIF_PAGE + SIF_POS + SIF_TRACKPOS enum ScrollBarDirection SB_HORZ = SB_VERT = SB_CTL = SB_BOTH =

　　public SCROLLINFO tvImageListScrollInfo

　　get

　　SCROLLINFO si = new SCROLLINFO();

　　si cbSize = (uint)Marshal SizeOf(si);

　　si fMask = (int)(ScrollInfoMask SIF_DISABLENOSCROLL | ScrollInfoMask SIF_ALL);

　　Win API GetScrollInfo(listBox Handle (int)ScrollBarDirection SB_VERT ref si);

　　return si;

　　 //当鼠标滚动时设置该滚动条

　　private void SetImageListScroll()

　　SCROLLINFO info = tvImageListScrollInfo;

　　if (info nMax > )

　　int pos = info nPos ;

　　if (pos >= )

　　customScrollbar Value = pos;

　　定义customScrollbar 的滚动事件函数customScrollbar _Scroll 实现在滚动条滚动的同时发消息给listBox使之同步滚动

　　Codeprivate void customScrollbar _Scroll(object sender EventArgs m) //当滚动条滚动时通知控件也跟着滚动吧

　　SCROLLINFO info = tvImageListScrollInfo;

　　info nPos = customScrollbar Value;

　　Win API SetScrollInfo(listBox Handle (int)ScrollBarDirection SB_VERT ref info true);

　　Win API PostMessage(listBox Handle Win API WM_VSCROLL Win API MakeLong((short)Win API SB_THUMBTRACK (short)(info nPos)) );

cha138/Article/program/net/201311/12416

知识大全 重绘的滚动条控制ListBox的滚动

知识大全重绘的滚动条控制ListBox的滚动