如何使用带有 TimeSpan 和两个复选框的秒表来决定计时器是向上计数还是向下计数?

Question

我希望如果选中复选框复选框倒计时，那么如果计时器已经在运行，计时器将倒计时，然后从它开始倒计时。如果在单击开始按钮之前在启动计时器之前选中了复选框，并且时间为 00：00：00：000，请不要倒计时。但是，如果时间是例如 01：00：00：000 或例如 00：00：00：011，则单击开始将倒计时，并且在到达 00：00：00：000 时应该停止

与checkBoxCountUp的想法相同。

这个想法是让复选框决定是向上计数还是向下计数，但我不确定如何使用秒表来做到这一点。

秒表只能计数？

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Diagnostics;
namespace StopwatchTimer
{
public partial class Form1 : Form
{
private static readonly Stopwatch watch = new Stopwatch();
private long diff = 0, previousTicks = 0, ticksDisplayed = 0;
public Form1()
{
InitializeComponent();
richTextBox1.TabStop = false;
richTextBox1.ReadOnly = true;
richTextBox1.BackColor = Color.White;
richTextBox1.Cursor = Cursors.Arrow;
richTextBox1.Enter += RichTextBox1_Enter; ;
UpdateTime();
}
private void RichTextBox1_Enter(object sender, EventArgs e)
{
btnStart.Focus();
}
private void UpdateTime()
{
richTextBox1.Text = GetTimeString(watch.Elapsed);
}
private string GetTimeString(TimeSpan elapsed)
{
string result = string.Empty;
//calculate difference in ticks
diff = elapsed.Ticks - previousTicks;
if (radioButton1.Checked == true)
{ //counting up
ticksDisplayed += diff;
}
else
{ //counting down
ticksDisplayed -= diff;
}
if (ticksDisplayed < 0)
{
ticksDisplayed = 0;
}
//Make ticksDisplayed to regular time to display in richtextbox
TimeSpan ctimeSpan = new TimeSpan(ticksDisplayed);
result = string.Format("{0:00}:{1:00}:{2:00}.{3:000}",
ctimeSpan.Hours,
ctimeSpan.Minutes,
ctimeSpan.Seconds,
ctimeSpan.Milliseconds);
previousTicks = elapsed.Ticks;
return result;
}
private void Form1_Load(object sender, EventArgs e)
{
}
private void btnStart_Click(object sender, EventArgs e)
{
if (btnStart.Text == "START")
{
diff = 0;
previousTicks = 0;
ticksDisplayed = 0;
watch.Reset();
watch.Start();
UpdateTime();
btnStart.Text = "STOP";
timer1.Enabled = true;
}
else
{
watch.Stop();
btnStart.Text = "START";
btnPause.Text = "PAUSE";
timer1.Enabled = false;
}
}
private void btnReset_Click(object sender, EventArgs e)
{
diff = 0;
previousTicks = 0;
ticksDisplayed = 0;
watch.Reset();
watch.Start();
UpdateTime();
}
private void trackBarHours_Scroll(object sender, EventArgs e)
{
}
private void trackBarMinutes_Scroll(object sender, EventArgs e)
{
}
private void trackBarSeconds_Scroll(object sender, EventArgs e)
{
}
private void btnPause_Click(object sender, EventArgs e)
{
if (btnStart.Text == "STOP")
{
if (btnPause.Text == "PAUSE")
{
btnPause.Text = "CONTINUE";
watch.Stop();
timer1.Enabled = false;
}
else
{
btnPause.Text = "PAUSE";
watch.Start();
timer1.Enabled = true;
}
}
}
private void timer1_Tick(object sender, EventArgs e)
{
UpdateTime();
}
}
}

Answer 1

最好使用radiobuttons但这是您的选择。为了执行您想要的操作，您需要计算两个连续UpdateTime()调用之间的时间(刻度(差异，并从显示的时间中添加或减去它。您还需要跟踪显示的时间，以便每次计时器滴答作响时都可以更新它。

法典：

//I am counting everything in Stopwatch ticks
private long diff = 0, previousTicks = 0, ticksDisplayed = 0;
private string GetTimeString( TimeSpan elapsed ) {
string result = string.Empty;
//calculate difference in ticks
diff = elapsed.Ticks - previousTicks;
//You can use checkBoxCountUp or checkBoxCountDown instead
if( radioButton1.Checked == false && radioButton2.Checked == false ) {
//do nothing
}
else if( radioButton1.Checked == true ) { //counting up
ticksDisplayed += diff;
}
else { //counting down
ticksDisplayed -= diff;
}
if( ticksDisplayed < 0) {
ticksDisplayed = 0;
}
//Make ticksDisplayed to regular time to display in richtextbox
TimeSpan ctimeSpan = new TimeSpan( ticksDisplayed );
result = string.Format( "{0:00}:{1:00}:{2:00}.{3:000}",
ctimeSpan.Hours,
ctimeSpan.Minutes,
ctimeSpan.Seconds,
ctimeSpan.Milliseconds );
previousTicks = elapsed.Ticks;
return result;
}

另外，每次重置Stopwatch时，不要忘记将diff, previousTicks, ticksDisplayed设置为零！

编辑

使用跟踪条的代码：

private void trackBar1_Scroll( object sender, EventArgs e ) { //hour
//get ticksDisplayed as TimeSpan
TimeSpan ctimeSpan = new TimeSpan( ticksDisplayed );
//change only the hour
TimeSpan htimeSpan = new TimeSpan( ctimeSpan.Days, trackBar1.Value, ctimeSpan.Minutes,
ctimeSpan.Seconds, ctimeSpan.Milliseconds );
//set it to ticksDisplayed and update.
ticksDisplayed = htimeSpan.Ticks;

UpdateTime();
}
private void trackBar2_Scroll( object sender, EventArgs e ) { //min
TimeSpan ctimeSpan = new TimeSpan( ticksDisplayed );
TimeSpan mtimeSpan = new TimeSpan( ctimeSpan.Days, ctimeSpan.Hours, trackBar2.Value,
ctimeSpan.Seconds, ctimeSpan.Milliseconds );
ticksDisplayed = mtimeSpan.Ticks;

UpdateTime();
}
private void trackBar3_Scroll( object sender, EventArgs e ) { //sec
TimeSpan ctimeSpan = new TimeSpan( ticksDisplayed );
TimeSpan stimeSpan = new TimeSpan( ctimeSpan.Days, ctimeSpan.Hours, ctimeSpan.Minutes,
trackBar3.Value, ctimeSpan.Milliseconds );
ticksDisplayed = stimeSpan.Ticks;

UpdateTime();
}

现在，当您重置Stopwatch时，您需要像这样设置时间：

watch.Reset();
TimeSpan ctimeSpan = new TimeSpan( 0, trackBar1.Value, trackBar2.Value, trackBar3.Value, 0 );
diff = 0;
previousTicks = 0;
ticksDisplayed = ctimeSpan.Ticks;