C#winform自定义滚动条
1.控件
一个UserControl作为ScrollBg,一个panel作为ScrollBar
2.实现功能
(1)设置滚动条背景颜色和背景图片
(2)设置滚动条滑块的背景颜色和背景图片
(3)鼠标左键拖动滑块上下滑动
(4)鼠标进入和离开滑块事件
(5)滚动鼠标中间滚轮事件
(6)鼠标左键点击滚动条除去滑块的位置,上下移动滑块
(7)鼠标左键长时间按住滚动条除去滑块的位置,上下移动滑块
3.关键数据
滑块大小: BoxPanelHeight/ContentPanelHeight*ScrollBgHeight
ContenPanel纵坐标: -ScrollBar.Top /( ScrollBgHeigh - ScrollBgHeight)* (ContentPanelHeight - BoxPanelHeight));
4.代码
(1)自定义控件
public partial class ScrollBarBg : UserControl
{
#region private properties private Timer ScrollTimer = null; /// <summary>
/// 框架面板高度
/// </summary>
private int BoxPanelHeight = ; /// <summary>
/// 内容面板高度
/// </summary>
private int ContentPanelHeight = ; /// <summary>
/// 滚动条滑块鼠标左键是否按下
/// </summary>
private bool IsLeftKeyDown_ScrollBar = false; /// <summary>
/// 滚动条背景板鼠标左键是否按下
/// </summary>
private bool IsLeftKeyDown_ScrollBg = false; /// <summary>
/// 鼠标相对有屏幕的Y坐标
/// </summary>
private int MouseYToScreen = ; #endregion public ScrollBarBg()
{
InitializeComponent();
this.ScrollBar.Top = ;
this.MouseWheel += ScrollBar_MouseWheel;
ScrollBar.MouseWheel += ScrollBar_MouseWheel;
ScrollTimer = new Timer();
ScrollTimer.Interval = ;
ScrollTimer.Tick += Timer_Tick;
} #region public /// <summary>
/// 滑块高度
/// </summary>
public int ScrollBarHeight
{
get { return this.ScrollBar.Height; }
} /// <summary>
/// 滑块在滚动条上的位置
/// </summary>
public int ScrollBarTop
{
set { ScrollBarAndContent(value); }
get { return this.ScrollBar.Top; }
} /// <summary>
/// 滑块背景颜色
/// </summary>
public Color ScrollBarBackColor
{
set { this.ScrollBar.BackColor = value; }
get { return ScrollBar.BackColor; }
} /// <summary>
/// 滑块背景图片
/// </summary>
public Image ScrollBarBackgroundImage
{
set { this.ScrollBar.BackgroundImage = value; }
get { return ScrollBar.BackgroundImage; }
} /// <summary>
/// 鼠标进入滚动条滑块事件
/// </summary>
public event EventHandler ScrollBarMouseEnter = null; /// <summary>
/// 鼠标离开滚动条滑块事件
/// </summary>
public event EventHandler ScrollBarMouseLeave = null; /// <summary>
/// 滑块滚动发生
/// int:内容面板相对于框架面板的高度
/// </summary>
public Action<int> ScrollBarScroll = null; /// <summary>
/// 鼠标转动滚轮滑块滚动的单位高度,影响滚动速度
/// </summary>
private int mouseWheelUnitHeight = ;
public int MouseWheelUnitHeight
{
set { mouseWheelUnitHeight = value; }
get { return mouseWheelUnitHeight; }
} /// <summary>
/// 长按滚动条背景框滑块滚动的单位高度,影响滚动速度
/// </summary>
private int timerScrollUnitHeight = ;
public int TimerScrollUnitHeight
{
set { timerScrollUnitHeight = value; }
get { return timerScrollUnitHeight; }
} /// <summary>
/// 设置滑块高度
/// </summary>
/// <param name="panelHeight">面板高度</param>
/// <param name="contentHeight">内容高度</param>
public void SetScrollBarHeight(int boxPanelHeight, int contentPanelHeight)
{
BoxPanelHeight = boxPanelHeight;
ContentPanelHeight = contentPanelHeight;
ScrollBar.Height = (int)((double)boxPanelHeight / contentPanelHeight * this.Height);
MouseWheel += ScrollBar_MouseWheel;
} /// <summary>
/// 内容面板鼠标滚动
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
public void ContentPanelMouseWheel(object sender, MouseEventArgs e)
{
ScrollBar_MouseWheel(sender, e);
} #endregion #region private private void ScrollBar_MouseWheel(object sender, MouseEventArgs e)
{
int ScrollBarTop = e.Delta > ? this.ScrollBar.Top - mouseWheelUnitHeight : this.ScrollBar.Top + mouseWheelUnitHeight;
ScrollBarAndContent(ScrollBarTop);
} private void ScrollBar_MouseDown(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
IsLeftKeyDown_ScrollBar = true;
MouseYToScreen = Control.MousePosition.Y;
}
} private void ScrollBar_MouseUp(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
IsLeftKeyDown_ScrollBar = false;
} private void ScrollBar_MouseMove(object sender, MouseEventArgs e)
{
if (IsLeftKeyDown_ScrollBar)
{
int ScrollBarTop = this.ScrollBar.Top + Control.MousePosition.Y - MouseYToScreen;
MouseYToScreen = Control.MousePosition.Y; ScrollBarAndContent(ScrollBarTop);
}
} private void ScrollBar_MouseEnter(object sender, EventArgs e)
{
if (ScrollBarMouseEnter != null)
ScrollBarMouseEnter(sender, e);
} private void ScrollBar_MouseLeave(object sender, EventArgs e)
{
if (ScrollBarMouseLeave != null)
ScrollBarMouseLeave(sender, e);
} private void ScrollBarBg_MouseDown(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
IsLeftKeyDown_ScrollBg = true;
ScrollTimer.Start();
}
} private void Timer_Tick(object sender, EventArgs e)
{
if (!IsLeftKeyDown_ScrollBg)
goto ret; int ScrollBarTop = this.ScrollBar.Top;
int ScrollBarMiddlePointY = ScrollBarTop + ScrollBar.Height / ;
int MousePointToClientY = this.PointToClient(Control.MousePosition).Y;
if (ScrollBarMiddlePointY > MousePointToClientY)
{
if (ScrollBarMiddlePointY - timerScrollUnitHeight < this.PointToClient(Control.MousePosition).Y)
goto ret;
else
ScrollBarTop -= timerScrollUnitHeight;
}
else
{
if (ScrollBarMiddlePointY + timerScrollUnitHeight > this.PointToClient(Control.MousePosition).Y)
goto ret;
else
ScrollBarTop += timerScrollUnitHeight;
} this.BeginInvoke(new Action(() =>
{
ScrollBarAndContent(ScrollBarTop);
}));
return; ret:
IsLeftKeyDown_ScrollBg = false;
ScrollTimer.Stop();
} private void ScrollBarBg_MouseUp(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Left && IsLeftKeyDown_ScrollBg)
{
IsLeftKeyDown_ScrollBg = false;
int ScrollBarTop = this.ScrollBar.Top + ScrollBar.Height / > e.Y ? this.ScrollBar.Top - timerScrollUnitHeight : this.ScrollBar.Top + timerScrollUnitHeight;
ScrollBarAndContent(ScrollBarTop);
}
} private void ScrollBarControl_SizeChanged(object sender, EventArgs e)
{
this.ScrollBar.Width = this.Width;
} private void ScrollBarAndContent(int ScrollBarTop)
{
if (ScrollBarTop <= )
this.ScrollBar.Top = ;
else if (ScrollBarTop >= this.Height - this.ScrollBar.Height)
this.ScrollBar.Top = this.Height - this.ScrollBar.Height;
else
this.ScrollBar.Top = ScrollBarTop; int Y = (int)(this.ScrollBar.Top / (double)(this.Height - this.ScrollBar.Height) * (ContentPanelHeight - BoxPanelHeight));
if (ScrollBarScroll != null)
ScrollBarScroll(-Y);
} #endregion
}
(2)使用
private void Form2_Load(object sender, EventArgs e)
{
scrollBarBg1.ScrollBarScroll += ScrollBarScroll;
pnContent.MouseWheel += PnContent_MouseWheel; scrollBarBg1.SetScrollBarHeight(this.pnBox.Height, this.pnContent.Height);
scrollBarBg1.ScrollBarTop = ;
} private void PnContent_MouseWheel(object sender, MouseEventArgs e)
{
scrollBarBg1.ContentPanelMouseWheel(sender, e);
} private void ScrollBarScroll(int y)
{
this.pnContent.Top = y;
}
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