I've created a C# windows form application that uses a timer to clear the input boxes every 5 minutes. There is a label called lblTime that displays the amount of time elapsed at any given point while the application is open.
I would like to be able to disable or pause the Timer (Clock.Enabled = false) with a button click, and have lblTime stay on the amount of time elapsed when the button was clicked. However, due to the way that the elapsedTime variable is calculated (DateTime.Now - startTime), this value carries on changing even after the timer has been disabled.
So, to sum up:
lblTime displays running time as Clock ticks
Clock can be disabled by button click, but lblTime carries on incrementing
lblTime needs to stop on current value on same button click that disables Clock, and then be able to start counting again from that same value.
Code that starts Clock, initialises and updates lblTime is displayed.
Any help would this would be very much appreciated,
Thanks,
Mark
private void btnStart_Click(object sender, EventArgs e)
{
//Timers set to start ticking
Clock.Enabled = true;
startTime = DateTime.Now; //the milisecond that btnStart is clicked
initialiseClock();
initialiseIntervalCounter();
}
private void initialiseClock() //initialisation of Clock Timer
{
Clock = new System.Windows.Forms.Timer();
Clock.Tick += new EventHandler(Clock_Tick); //calls Clock EventHandler
Clock.Interval = 1000; //1 second in miliseconds
Clock.Start();
}
private void Clock_Tick(object sender, EventArgs e) //Clock EventHandler definition
{
updateTimeDisplay();
checkDisplay();
}
private void updateTimeDisplay()
{
elapsedTime = (DateTime.Now - startTime);
lblTime.Text = Convert.ToString(elapsedTime);
}
Use a bool flag and a TimeSpan and a counter for the seconds until the next clearing:
DateTime startTime = DateTime.Now;
TimeSpan elapsed = new TimeSpan(0);
bool running = true;
int clearInSeconds = 300;
private void Clock_Tick(object sender, EventArgs e)
{
// function one: count elapsed running time
if (running) elapsed = elapsed.Add(new TimeSpan(0, 0, 1));
lblTime.Text = startTime.Add(elapsed).ToLongTimeString();
// function two: clear stuff after interval:
if (clearInSeconds-- <= 0)
{
clearInSeconds = 300;
// clear your stuff now
}
}
Use your button click to switch between running and not running. I used a click on the label:
private void lblTime_Click(object sender, EventArgs e)
{
running = !running;
}
Change the method in which the countdown time is used. Use a TimeSpan datatype. Initialize the variable to 5 minutes New TimeSpan(0, 5, 0) and use it instead of a start time and Now().
Related
I am wondering what is the best way to achieve this in Windows Forms - what I need is a window showing time elapsed (1 sec 2 secs etc) up to 90 seconds while code is being executed. I have a timer right now implemented as follows but I think I also need a stopwatch there as well since the Timer blocks the main thread.
static System.Timers.Timer pXRFTimer = new System.Timers.Timer();
static int _pXRFTimerCounter = 0;
private void ScanpXRF()
{
_pXRFTimerCounter = 0;
pXRFTimer.Enabled = true;
pXRFTimer.Interval = 1000;
pXRFTimer.Elapsed += new ElapsedEventHandler(pXRFTimer_Tick);
pXRFTimer.Start();
//START action to be measured here!
DoSomethingToBeMeasured();
}
private static void pXRFTimer_Tick(Object sender, EventArgs e)
{
_pXRFTimerCounter++;
if (_pXRFTimerCounter >= 90)
{
pXRFTimer.Stop();
}
else
{
//show time elapsed
}
}
I'm not sure about mechanics of your app, but time elapsed can be calculated with something like this
DateTime startUtc;
private void ScanpXRF()
{
startUtc = DateTime.NowUtc;
(...)
//START action to be measured here!
}
private static void pXRFTimer_Tick(Object sender, EventArgs e)
{
var elapsed = DateTime.NowUtc - startUtc;
var elapsedSeconds = elapsed.TotalSeconds; // double so you may want to round.
}
NOTE: This question is related to this one as well
How to create an advanced countdown timer
I have a timer which is activated by a button that starts the countdown of the supposed activity. But I have a problem, when I press the same button again, the program must use another time (specified inside a datagrid) and start the countdown again, and if I press the button again, another time and so on.
Shall I use multiple timers or is there a way I can use the same timer, but with new ("reset") values if I press the button?
(If you guys want me to show more of the code, just tell me I'll post here)
private bool timeSet2 = false;
int f = 1;
private void timer3_Tick(object sender, EventArgs e)
{
DateTime timeConvert;
DateTime dateTime = DateTime.Now;
string timeOp = dataGridView1.Rows[f].Cells[2].Value + "";
f++;
if (!timeSet2) // only get the value once
{
DateTime.TryParse(timeOp, out timeConvert);
milliSecondsLeft = (int)timeConvert.TimeOfDay.TotalMilliseconds;
timeSet2 = true;
}
milliSecondsLeft = milliSecondsLeft - 1000;
if (milliSecondsLeft > 0)
{
var span = new TimeSpan(0, 0, 0, 0, milliSecondsLeft);
lblLeft.Text = span.ToString(#"hh\:mm\:ss");
}
else
{
timer3.Stop();
}
I need to fit a button right here so if I press it, my program will start another countdown. But I don't know if I'll have to create another time for this.
You can use the same timer and reset it for each countdown. But I think you are misunderstanding the the functionality of the timer. The timer_Tick event occurs every time the interval of the timer has elapsed. Update the milliSecondsLeft variable on your button click event.
You have to move some code to the button_Click event.
private void button1_Click(object sender, EventArgs e)
{
milliSecondsLeft = Convert.ToInt32(dataGridView1.Rows[f].Cells[2].Value)*1000;
f++;
timer3.Start();
}
Your timer_Tick event would then look like:
private void timer3_Tick(object sender, EventArgs e)
{
milliSecondsLeft = milliSecondsLeft - 1000;
if (milliSecondsLeft > 0)
{
var span = new TimeSpan(0, 0, 0, 0, milliSecondsLeft);
lblLeft.Text = span.ToString(#"hh\:mm\:ss");
}
else
{
timer3.Stop();
}
}
Some other things:
Are you sure you want to start with the second column of your dataGridView with int f = 1;
I did not understand your time conversion so I changed it. Now it expects the countdown time in your dataGridView to be in seconds. But perhaps your code is right for your purpose
I have numericUpDown1 that when I set its value it's saving the value in options text file:
private void numericUpDown1_ValueChanged(object sender, EventArgs e)
{
Options_DB.Set_Radar_Images_Time(numericUpDown1.Value);
}
timer1 interval set to 1000ms in the form1 designer.
In timer1 tick event I have:
private void timer1_Tick(object sender, EventArgs e)
{
numbers_radar = Convert.ToInt64(numericUpDown1.Value);
}
Now I want to assign the timer tick event to: label21.Text and display the minutes counting down.
If I set the numericUpDown1 to 10 so it will count down 10 minutes.
The format should be like: minutes:seconds (00:00).
And each time the timer get to 1 it should call this method: fileDownloadRadar();
Each time when it's get to 1 the timer should be reset to the numericUpDown1 value and start over again counting back and each time in the end to call the method fileDownloadRadar();
The numericUpDown1 is set to minimum 5 and maximum 60
EDIT
Now i tried this code but i don't see anything change on label21 when starting the timer.
And minutes is starting as 0 but should be in this case 29(value of numericUpDown1).
And should i check if minutes and seconds == 1 or == 0 ? What's more logic 1 or 0 ?
private void timer1_Tick(object sender, EventArgs e)
{
numOfMinutes = Convert.ToInt32(numericUpDown1.Value);
int seconds = numOfMinutes % 60;
int minutes = numOfMinutes / 60;
seconds --;
string time = minutes + ":" + seconds;
label21.Text = time;
if (seconds == 1)
{
minutes --;
}
if (minutes == 1 && seconds == 1)
{
numOfMinutes = Convert.ToInt32(numericUpDown1.Value);
fileDownloadRadar();
}
}
I think you could better use a TimeSpan object and start as follows.
declare a TimeSpan variable in your object (thus a private field):
private TimeSpan span;
Just below the code where you start the timer, initialize the span variable:
timer1.Start(); // this should exist somewhere
TimeSpan span = new TimeSpan(0, numericUpDown1.Value, 0);
In your timer event handler, write this code:
private void timer1_Tick(object sender, EventArgs e)
{
span = span.Subtract(new TimeSpan(0, 0, 1));
label21.Text = span.ToString(#"mm\:ss");
if (span.TotalSeconds < 1)
{
span = new TimeSpan(0, numericUpDown1.Value, 0);
fileDownloadRadar();
}
}
I'm not sure what you want in the if statement, but I hope this will help you further.
In this code after starting timer again it starts from the current value instead of the vale it stopped. How to pause this timer?
public Page1()
{
InitializeComponent();
_rnd = new Random();
_timer = new DispatcherTimer();
_timer.Tick += new EventHandler(TimerTick);
_timer.Interval = new TimeSpan(0, 0, 0, 1);
}
void TimerTick(object sender, EventArgs e)
{
var time = DateTime.Now - _startTime;
txtTime.Text = string.Format(Const.TimeFormat, time.Hours, time.Minutes, time.Seconds);
}
public void NewGame()
{
_moves = 0;
txtMoves.Text = "0";
txtTime.Text = Const.DefaultTimeValue;
Scrambles();
while (!CheckIfSolvable())
{
Scrambles();
}
_startTime = DateTime.Now;
_timer.Start();
//GridScrambling.Visibility = System.Windows.Visibility.Collapsed;
}
private void Pause_Click(object sender, System.Windows.RoutedEventArgs e)
{
// TODO: Add event handler implementation here.
NavigationService.Navigate(new Uri("/Page4.xaml", UriKind.Relative));
_timer.Stop();
}
private void Play_Loaded(object sender, System.Windows.RoutedEventArgs e)
{
// TODO: Add event handler implementation here.
_timer.Start();
}
As this says that the Stop method only changes the IsEnabled property and this says that this property only prevents the Tick event to be raised, I don't think that there is a method to simply 'pause' the timer. The best way is to reinitialize the timer each time you have "paused" it, if you really want it to start clean again.
But I do not think that this is you real problem. When you pause your game the timer stops working. When you continue it the timer starts working again. When you now try the calculate the time from THIS moment till the start time, then you make a big mistake: you have to ignore the paused time. Because when you play the game 2s, then pause it for 10s and then continue the game, the timer shows 12s, instead of 2s, doesn't it? Maybe you should store the paused times in a variable and substract that from the real game time.
How to stop a timer after some numbers of ticks or after, let's say, 3-4 seconds?
So I start a timer and I want after 10 ticks or after 2-3 seconds to stop automatically.
Thanks!
You can keep a counter like
int counter = 0;
then in every tick you increment it. After your limit you can stop timer then. Do this in your tick event
counter++;
if(counter ==10) //or whatever your limit is
yourtimer.Stop();
When the timer's specified interval is reached (after 3 seconds), timer1_Tick() event handler will be called and you could stop the timer within the event handler.
Timer timer1 = new Timer();
timer1.Interval = 3000;
timer1.Enabled = true;
timer1.Tick += new System.EventHandler(timer1_Tick);
void timer1_Tick(object sender, EventArgs e)
{
timer1.Stop(); // or timer1.Enabled = false;
}
i generally talking because you didn't mention which timer, but they all have ticks... so:
you'll need a counter in the class like
int count;
which you'll initialize in the start of your timer, and you'll need a dateTime like
DateTime start;
which you'll initialize in the start of your timer:
start = DateTime.Now;
and in your tick method you'll do:
if(count++ == 10 || (DateTime.Now - start).TotalSeconds > 2)
timer.stop()
here is a full example
public partial class meClass : Form
{
private System.Windows.Forms.Timer t;
private int count;
private DateTime start;
public meClass()
{
t = new Timer();
t.Interval = 50;
t.Tick += new EventHandler(t_Tick);
count = 0;
start = DateTime.Now;
t.Start();
}
void t_Tick(object sender, EventArgs e)
{
if (count++ >= 10 || (DateTime.Now - start).TotalSeconds > 10)
{
t.Stop();
}
// do your stuff
}
}
Assuming you are using the System.Windows.Forms.Tick. You can keep track of a counter, and the time it lives like so. Its a nice way to use the Tag property of a timer.
This makes it reusable for other timers and keeps your code generic, instead of using a globally defined int counter for each timer.
this code is quiet generic as you can assign this event handler to manage the time it lives, and another event handler to handle the specific actions the timer was created for.
System.Windows.Forms.Timer ExampleTimer = new System.Windows.Forms.Timer();
ExampleTimer.Tag = new CustomTimerStruct
{
Counter = 0,
StartDateTime = DateTime.Now,
MaximumSecondsToLive = 10,
MaximumTicksToLive = 4
};
//Note the order of assigning the handlers. As this is the order they are executed.
ExampleTimer.Tick += Generic_Tick;
ExampleTimer.Tick += Work_Tick;
ExampleTimer.Interval = 1;
ExampleTimer.Start();
public struct CustomTimerStruct
{
public uint Counter;
public DateTime StartDateTime;
public uint MaximumSecondsToLive;
public uint MaximumTicksToLive;
}
void Generic_Tick(object sender, EventArgs e)
{
System.Windows.Forms.Timer thisTimer = sender as System.Windows.Forms.Timer;
CustomTimerStruct TimerInfo = (CustomTimerStruct)thisTimer.Tag;
TimerInfo.Counter++;
//Stop the timer based on its number of ticks
if (TimerInfo.Counter > TimerInfo.MaximumTicksToLive) thisTimer.Stop();
//Stops the timer based on the time its alive
if (DateTime.Now.Subtract(TimerInfo.StartDateTime).TotalSeconds > TimerInfo.MaximumSecondsToLive) thisTimer.Stop();
}
void Work_Tick(object sender, EventArgs e)
{
//Do work specifically for this timer
}
When initializing your timer set a tag value to 0 (zero).
tmrAutoStop.Tag = 0;
Then, with every tick add one...
tmrAutoStop.Tag = int.Parse(tmrAutoStop.Tag.ToString()) + 1;
and check if it reached your desired number:
if (int.Parse(tmrAutoStop.Tag.ToString()) >= 10)
{
//do timer cleanup
}
Use this same technique to alternate the timer associated event:
if (int.Parse(tmrAutoStop.Tag.ToString()) % 2 == 0)
{
//do something...
}
else
{
//do something else...
}
To check elapsed time (in seconds):
int m = int.Parse(tmrAutoStop.Tag.ToString()) * (1000 / tmrAutoStop.Interval);