如何在C＃winforms中设置轨道栏的invterval。 [英] How to set invterval for the trackbar in C# winforms.

问题描述

如何设置C＃winforms中轨道栏的间隔而不是连续数字？



指针应该跳到1,5,10,15而不是1,2,3,4,5 ...... 15。



我试图在TrackBar的属性中设置SmallChange = 5但是在拖动指针时它不会改变间隔。



有谁可以帮忙解决这个问题？

解决方案

TrackBar的'Value属性从'MinimumValue到'MaximumValue是连续的。



要模拟棘爪（对齐值），你需要像这样实现TrackBar'ValueChanged EventHandler：

  private   int  smallChangeValue =  5 ; 
  private   int  trackValue; 
  private   bool  blockRecursion =  false ; 
 
  private   void  trackBar1_ValueChanged（ object  sender，EventArgs e）
 {
  if （blockRecursion） return ; 
 
 trackValue = trackBar1.Value; 
 
  if （trackValue％smallChangeValue！=  0 ）
 { 
 trackValue =（trackValue / smallChangeValue）* smallChangeValue; 
 
  //  请参阅下面的注释＃1  
 blockRecursion = < span class =code-keyword> true ; 
 
 trackBar1.Value = trackValue; 
 
 blockRecursion =  false ; 
} 
 
  //  仅供调试 
  //   textBox1.Text = trackValue.ToString（）;  
}  
 
 
注意＃1：在这个例子中，设置一个阻止递归的标志并不是必需的;显示这个的原因是为了你想要做一些更复杂的处理，例如：检查值的模数余数和小变化值，并且，如果它更接近下一个值，则进行四舍五入。

只需更改TickFrequency属性

How to set the interval for the track-bar in C# winforms instead of continuous numbers?

The pointer should jump to 1,5,10,15 instead of 1,2,3,4,5...15.

I have tried to set the SmallChange=5 in the Properties of TrackBar but it doesn't change the interval while dragging the pointer.

Can anyone please help to fix this problem?

解决方案

The 'Value Property of the TrackBar is continuous from 'MinimumValue to 'MaximumValue.

To simulate detents (snap-to-values) you need to implement a TrackBar 'ValueChanged EventHandler like this:

private int smallChangeValue = 5;
private int trackValue;
private bool blockRecursion = false;

private void trackBar1_ValueChanged(object sender, EventArgs e)
{
    if (blockRecursion) return;

    trackValue = trackBar1.Value;

    if (trackValue % smallChangeValue  != 0)
    {
        trackValue = (trackValue / smallChangeValue) * smallChangeValue;

        // see note #1 below
        blockRecursion = true;

            trackBar1.Value = trackValue;

        blockRecursion = false;
    }

    // for debugging only
    // textBox1.Text = trackValue.ToString();
}

If you examine what's happening here, you can see this is just doing a simple form of rounding-off (rounding-down actually) of the TrackBar value.

note #1: in this example the setting a flag to block recursion is not really necessary; the reason this is shown is in case you want to do a bit more sophisticated handling such as: examining the modulo remainder of value and small-change value, and, in case it's closer to the next value, rounding-up.

just change TickFrequency properties

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