C#winform自定义滚动条
标签：hid winform end sem cti 滚动 The use mamicode
1.控件
一个UserControl作为ScrollBg，一个panel作为ScrollBar
2.关键数据
滑块大小： BoxPanelHeight/ContentPanelHeight*ScrollBgHeight
ContenPanel纵坐标： -ScrollBar.Top /( ScrollBgHeigh - ScrollBgHeight)* (ContentPanelHeight - BoxPanelHeight));
3代码
public partial class ScrollBarBg : UserControl
{
#region private properties
private Timer ScrollTimer = null;
///
/// 框架面板高度
///
private int BoxPanelHeight = 0;
///
/// 内容面板高度
///
private int ContentPanelHeight = 0;
///
/// 滚动条滑块鼠标左键是否按下
///
private bool IsLeftKeyDown_ScrollBar = false;
///
/// 滚动条背景板鼠标左键是否按下
///
private bool IsLeftKeyDown_ScrollBg = false;
///
/// 鼠标相对有屏幕的Y坐标
///
private int MouseYToScreen = 0;
#endregion
public ScrollBarBg()
{
InitializeComponent();
this.MouseWheel += ScrollBar_MouseWheel;
ScrollBar.MouseWheel += ScrollBar_MouseWheel;
ScrollTimer = new Timer();
ScrollTimer.Interval = 200;
ScrollTimer.Tick += Timer_Tick;
}
#region public
///
/// 滑块背景颜色
///
public Color ScrollBarBackColor
{
set { this.ScrollBar.BackColor = value; }
get { return ScrollBar.BackColor; }
}
///
/// 滑块背景图片
///
public Image ScrollBarBackgroundImage
{
set { this.ScrollBar.BackgroundImage = value; }
get { return ScrollBar.BackgroundImage; }
}
///
/// 鼠标进入滚动条滑块事件
///
public event EventHandler ScrollBarMouseEnter = null;
///
/// 鼠标离开滚动条滑块事件
///
public event EventHandler ScrollBarMouseLeave = null;
///
/// 滑块滚动发生
/// int：内容面板相对于框架面板的高度
///
public Actionint> ScrollBarScroll = null;
///
/// 鼠标转动滚轮滑块滚动的单位高度,影响滚动速度
///
private int mouseWheelUnitHeight = 10;
public int MouseWheelUnitHeight
{
set { mouseWheelUnitHeight = value; }
get { return mouseWheelUnitHeight; }
}
///
/// 长按滚动条背景框滑块滚动的单位高度,影响滚动速度
///
private int timerScrollUnitHeight = 40;
public int TimerScrollUnitHeight
{
set { timerScrollUnitHeight = value; }
get { return timerScrollUnitHeight; }
}
///
/// 设置滑块高度
///
/// 面板高度
/// 内容高度
public void SetScrollBarHeight(int boxPanelHeight, int contentPanelHeight)
{
BoxPanelHeight = boxPanelHeight;
ContentPanelHeight = contentPanelHeight;
ScrollBar.Height = (int)((double)boxPanelHeight / contentPanelHeight * this.Height);
MouseWheel += ScrollBar_MouseWheel;
}
///
/// 内容面板鼠标滚动
///
///
///
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 > 0 ? 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 / 2;
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 / 2 > 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 0)
this.ScrollBar.Top = 0;
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
}
View Code
C#winform自定义滚动条
标签：hid winform end sem cti 滚动 The use mamicode
原文地址：https://www.cnblogs.com/yaosj/p/10697874.html
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