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C#皮肤－CustomScrollbar 控件实现
导读部分
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C#皮肤－实现原理系列文章导航
http://www.sufeinet.com/thread-2-1-1.html
大家还是先来看看效果吧
下面我们一起来看看是怎么样实现的
1.这控件还没有真正的完成，大家也只能试用一下了，效果基本是这样的，上面的上下箭头和中间的滚动的图片都是动态要吧调整的，具体的方法大家自己参考 一下源代码吧，如果有更新，或是真正写在控件里的时候我会在皮肤的新版本中给出，这里我们先来看看控件的基本实现吧，做过自定义滚动条的朋友应该都 知道 什么是Windows消息，.net没有提共控件的直接Scroll，我们只能通过拦截Windows消息来处理了，和处理APIHook来解决问题了，Windows消息一般要处理这样几个VSCROLL,WM_HITTEST,WM_NCMOUSEMOVE等
在这里我多说几句，在处理滚动条的时候一般都 要处理这样几个方法
1.第一个是Value值
这里有一段参考代码可以分享一下
[code=csharp]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 < 56)
{
nThumbHeight = 56;
fThumbHeight = 56;
}
//figure out value
int nPixelRange = nTrackHeight - nThumbHeight;
int nRealRange = (Maximum - Minimum) - LargeChange;
float fPerc = 0.0f;
if (nRealRange != 0)
{
fPerc = (float)moValue / (float)nRealRange;
}
float fTop = fPerc * nPixelRange;
moThumbTop = (int)fTop;
Invalidate();
}
}[/code]
其它的跟这个基本上差不多，都 是先画个自己的滚动条，然后通过Api把系统的隐藏，把自己的加上，并且让他们产生连动;
用到的Api介绍一下
[code=csharp][DllImport("user32.dll")]
[return: MarshalAs(UnmanagedType.Bool)]
public static extern bool GetScrollInfo(IntPtr hwnd, int fnBar, ref SCROLLINFO lpsi);
[DllImport("user32.dll")]
public static extern int SetScrollInfo(IntPtr hwnd, int fnBar, [In] ref SCROLLINFO
lpsi, bool fRedraw);[/code]
关于这两个Api的介绍如下
GetScrollInfo该函数找到滚动条的参数，包括滚动条位置的最小值、最大值，页面大小，滚动按钮的 位置，
函数原型：BOOL GetScrolllnfo（HWND hWnd，int fnBar，LPSCROLLINFO lpsi）；
参数：
hWnd：滚动条控制或有标准滚动条的窗体句柄，由fnBar参数确定。
fnBar：指定待找回滚动条参数的类型，此参数可以为如下值，其值含义：
SB_CTL：找回滚动条控制参数。其中参数hwnd一定是处理滚动条控制的句柄。
SB_HORZ：找回所指定窗体的标准水平滚动条参数。
SB_VERT：找回所指定窗体的标准垂直滚动条参数。
lpsi：指向SCROLLINFO结构。在调用Getscrolllofo函数之前，设置SCROLLINFO结构中cbSize成员以标识结构 大小，设置成员fMask以说明待找回的滚动条参数。在运行之前，函数复制结构中适当的成员所指定的参数。
成员fMask可以是如下值：
SIF_PAGE：复制滚动页码到由lpsi指向的SCROLLINFO结构的nPage成员中。
SIF_POS：复制滚动位置到由lpsi指向的SCROLLINFO结构的nPos成员中。
GetScrollInfo-相关资料SIF_RANGE：复制滚动范围到由lpsi指向的SCROLLINFO结构的nMin和nMax成员中。
SIF_TRACKPOS：复制当前滚动盒跟踪位置到由nTrackPos指向的SCROLLINFO结构的 nPage成员中。
返回值：如果函数找到任何一个值，那么返回值为非零；如果函数没有找到任何值，那么返回值为零；
注意：Getscrolllnfo函数尽管WM_HSCROLL和WM_VSCROLL指出了滚动条位置消息，却仅提供了16位数据，而函数 SetScrollnfo和GetScrollnfo则提供了32位的滚动条数据。因而，当应用程序在处理WM_HSCROLL或 WM_VSCROLL时，要获得32位滚动条位置的数据时， 则要调用Getscrolllnfo函数。 在WM_HSCROLL或WM_VSCROLL消息中SB_THUMBTRACK通告过程中，为了获得32位的滚动盒位置，需要调用 GetScrolllnfo函数以得到结构SCROLLINFO成员fMask中的SCROLLINFO值。函数返回在结构SCROLLINFO成员nTrackPos中指出的滚动盒跟踪位置的值。这将允许当用户移动滚动盒时能得到其位置。
SetScrollInfo函数功能：该函数设置滚动条参数，包括滚动位置的最大值和最小值，页面大小，滚动按钮的位置。如被请求，函数也可以重画滚动条。
函数原型：int SetScrollInfo（HWND hWnd；int fnBar，LPSCROLLINFO lpsi，BOOL fRedraw）；
参数：
hWnd：滚动条控制或带标准滚动条的窗体句柄，由fnBar参数决定。
fnBar：指定被设定参数的滚动条的类型。这个参数可以是下面值，含义如下：
SB_CTL：设置滚动条控制。而参数hwnd必须是滚动条控制的句柄。
SB_HORZ：设置所给定的窗体上标准水平滚动条参数。
SB_VERT：设置所给定的窗体上标准垂直滚动条参数。
IPBI：指向SCROLLINFO结构。在调用SetScrognfo之前，设置 SCROLLINFO结构中cbSize成员以标识结构大小，设置成员fMask以说明待设置的滚动条参数，并且在适当的成员中制定新的参数值。成员 fMask可以为下面所列复合值，含义如下：
SIF_DfSABLENOSCROLL：如果滚动条的新参数使其为没必要，则使滚动条无效而不再移动它。
SIF_PAGE：设置滚动页码值到由Ipsi指向的SCROLLINFO结构的nPage成员中。
SIF_POS：设置滚动位置值到由lpsi指向的SCROLLINFO结构的nPos成员中。
SIF_RANGE：设置滚动范围值到由lpsl指向的SCROLLINFO结构的nMin和nMax成员中。
fRedraw：指定滚动条是否重画以反映滚动条的变化。如果这个参数为TRUE，滚动条将被重画，否则不被重画。
返回值：返回值是滚动盒的当前位置。
注意：SetScrolllnfo函数执行任务是检查SCROLLINFO结构中由成员 nPage和nPos值的范围。成员uPage值必须从0到nMax- nMin＋1，成员nPos必须是在nMin和nMax-nMax-max（nPage C1，0）之间的指定值。如果任何一个值超过了这个范围，函数将在指定范围内为它设置一个值。
第二个，是鼠标事件我在这里处理了三个，参考 一下吧
[code=csharp]//鼠标按下
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 < 56)
{
nThumbHeight = 56;
fThumbHeight = 56;
}
int nTop = moThumbTop;
nTop += UpArrowImage.Height;
Rectangle thumbrect = new Rectangle(new Point(1, 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(1, 0), new Size(UpArrowImage.Width, UpArrowImage.Height));
if (uparrowrect.Contains(ptPoint))
{
int nRealRange = (Maximum - Minimum) - LargeChange;
int nPixelRange = (nTrackHeight - nThumbHeight);
if (nRealRange > 0)
{
if (nPixelRange > 0)
{
if ((moThumbTop - SmallChange) < 0)
moThumbTop = 0;
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(1, UpArrowImage.Height + nTrackHeight), new Size(UpArrowImage.Width, UpArrowImage.Height));
if (downarrowrect.Contains(ptPoint))
{
int nRealRange = (Maximum - Minimum) - LargeChange;
int nPixelRange = (nTrackHeight - nThumbHeight);
if (nRealRange > 0)
{
if (nPixelRange > 0)
{
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();
}
}
}
}
//鼠标松开
private void CustomScrollbar_MouseUp(object sender, MouseEventArgs e)
{
this.moThumbDown = false;
this.moThumbDragging = false;
}
//鼠标经过
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());
}[/code]
第三个 就是MoveThumb方法了，看方法体
[code=csharp]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 < 56)
{
nThumbHeight = 56;
fThumbHeight = 56;
}
int nSpot = nClickPoint;
int nPixelRange = (nTrackHeight - nThumbHeight);
if (moThumbDown && nRealRange > 0)
{
if (nPixelRange > 0)
{
int nNewThumbTop = y - (UpArrowImage.Height + nSpot);
if (nNewThumbTop < 0)
{
moThumbTop = nNewThumbTop = 0;
}
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();
}
}
}[/code]
处理完这几天我们基本上就完成了，其它的关于图片是怎么加载和取色的这块我就不多说了，大家下载源代码一看就明白了，或者也可以参考一下其实的实现。
大家提提建议吧
不知道 大家有什么更好的想法没有，或是你使用c#实现过滚动条，可以贴下代码让小弟学习一下，感谢！！！
下面我先贴一下我的代码吧
[code=csharp]代码
using 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 CRD.WinUI.Misc
{
[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 = 10;
protected int moSmallChange = 1;
protected int moMinimum = 0;
protected int moMaximum = 100;
protected int moValue = 0;
private int nClickPoint;
protected int moThumbTop = 0;
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 < 56)
{
nThumbHeight = 56;
fThumbHeight = 56;
}
return nThumbHeight;
}
public CustomScrollbar()
{
InitializeComponent();
SetStyle(ControlStyles.ResizeRedraw, true);
SetStyle(ControlStyles.AllPaintingInWmPaint, true);
SetStyle(ControlStyles.DoubleBuffer, true);
moChannelColor = Color.FromArgb(51, 166, 3);
UpArrowImage = Bitmap.FromStream(Shared.AssemblyWinUI.GetManifestResourceStream("CRD.WinUI.Resources.Common.scroll.uparrow.png"), true, false);// BASSSkin.uparrow;//上箭头
DownArrowImage = Bitmap.FromStream(Shared.AssemblyWinUI.GetManifestResourceStream("CRD.WinUI.Resources.Common.scroll.downarrow.png"), true, false);// BASSSkin.downarrow;//下箭头
ThumbBottomImage = Bitmap.FromStream(Shared.AssemblyWinUI.GetManifestResourceStream("CRD.WinUI.Resources.Common.scroll.ThumbBottom.png"), true, false);// BASSSkin.ThumbBottom;
ThumbMiddleImage = Bitmap.FromStream(Shared.AssemblyWinUI.GetManifestResourceStream("CRD.WinUI.Resources.Common.scroll.ThumbMiddle.png"), true, false);// BASSSkin.ThumbMiddle;
this.Width = UpArrowImage.Width;//18px
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 < 56)
{
nThumbHeight = 56;
fThumbHeight = 56;
}
//figure out value
int nPixelRange = nTrackHeight - nThumbHeight;
int nRealRange = (Maximum - Minimum) - LargeChange;
float fPerc = 0.0f;
if (nRealRange != 0)
{
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.Drawing2D.InterpolationMode.NearestNeighbor;
if (UpArrowImage != null)
{
e.Graphics.DrawImage(UpArrowImage, new Rectangle(new Point(0, 0), new Size(this.Width, UpArrowImage.Height)));
}
Brush oBrush = new SolidBrush(moChannelColor);
Brush oWhiteBrush = new SolidBrush(Color.FromArgb(255, 255, 255));
// 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(0, UpArrowImage.Height, 1, (this.Height - DownArrowImage.Height)));
e.Graphics.FillRectangle(oWhiteBrush, new Rectangle(this.Width - 1, UpArrowImage.Height, 1, (this.Height - DownArrowImage.Height)));
//draw channel
//e.Graphics.FillRectangle(oBrush, new Rectangle(1, UpArrowImage.Height, this.Width-2, (this.Height-DownArrowImage.Height)));
e.Graphics.DrawImage(ThumbBottomImage, new Rectangle(0, 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 < 56)
{
nThumbHeight = 56;
fThumbHeight = 56;
}
//Debug.WriteLine(nThumbHeight.ToString());
//float fSpanHeight = (fThumbHeight - (ThumbMiddleImage.Height + ThumbTopImage.Height + ThumbBottomImage.Height)) / 2.0f;
//int nSpanHeight = (int)fSpanHeight;
int nTop = moThumbTop;//0
nTop += UpArrowImage.Height;//9px
//draw top画上面的按钮
//e.Graphics.DrawImage(ThumbTopImage, new Rectangle(0, nTop, this.Width, ThumbTopImage.Height));
//nTop += ThumbTopImage.Height;//10px
//draw top span
//Rectangle rect = new Rectangle(1, nTop, this.Width - 2, nSpanHeight);
//e.Graphics.DrawImage(ThumbTopSpanImage, 1.0f,(float)nTop, (float)this.Width-2.0f, (float) fSpanHeight*2);
// nTop += nSpanHeight;//11px
//draw middle
e.Graphics.DrawImage(ThumbMiddleImage, new Rectangle(0, nTop, this.Width, ThumbMiddleImage.Height));
//nTop += ThumbMiddleImage.Height;
//draw top span
//rect = new Rectangle(1, nTop, this.Width - 2, nSpanHeight*2);
//e.Graphics.DrawImage(ThumbBottomSpanImage, rect);
//nTop += nSpanHeight;
//draw bottom
//e.Graphics.DrawImage(ThumbBottomImage, new Rectangle(1, nTop, this.Width - 2, nSpanHeight));
if (DownArrowImage != null)
{
e.Graphics.DrawImage(DownArrowImage, new Rectangle(new Point(0, (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);
}
//鼠标按下
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 < 56)
{
nThumbHeight = 56;
fThumbHeight = 56;
}
int nTop = moThumbTop;
nTop += UpArrowImage.Height;
Rectangle thumbrect = new Rectangle(new Point(1, 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(1, 0), new Size(UpArrowImage.Width, UpArrowImage.Height));
if (uparrowrect.Contains(ptPoint))
{
int nRealRange = (Maximum - Minimum) - LargeChange;
int nPixelRange = (nTrackHeight - nThumbHeight);
if (nRealRange > 0)
{
if (nPixelRange > 0)
{
if ((moThumbTop - SmallChange) < 0)
moThumbTop = 0;
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(1, UpArrowImage.Height + nTrackHeight), new Size(UpArrowImage.Width, UpArrowImage.Height));
if (downarrowrect.Contains(ptPoint))
{
int nRealRange = (Maximum - Minimum) - LargeChange;
int nPixelRange = (nTrackHeight - nThumbHeight);
if (nRealRange > 0)
{
if (nPixelRange > 0)
{
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();
}
}
}
}
//鼠标松开
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 < 56)
{
nThumbHeight = 56;
fThumbHeight = 56;
}
int nSpot = nClickPoint;
int nPixelRange = (nTrackHeight - nThumbHeight);
if (moThumbDown && nRealRange > 0)
{
if (nPixelRange > 0)
{
int nNewThumbTop = y - (UpArrowImage.Height + nSpot);
if (nNewThumbTop < 0)
{
moThumbTop = nNewThumbTop = 0;
}
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();
}
}
}
//鼠标经过
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;
}
}
}
}[/code]
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窥视卡
雷达卡
发表于 2013-3-6 12:52:34
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发表于 2013-3-6 13:05:54
