Hi there. I would like to know how to make a label blink. Like I have these 2 labels. I would like the first label to blink when the form is loaded. Then when I press a button, the blinking label will stop and I will have the second label's visibility pop up.
Thanks for any and all the help!
Use a timer.
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using Timer = System.Timers.Timer;
namespace daniweb.timer
{
public partial class frmBlink : Form
{
private Timer timer;
private long syncPoint;
public frmBlink()
{
InitializeComponent();
timer = new Timer();
timer.Interval = 250; //1 sec
timer.AutoReset = true;
timer.Elapsed += new System.Timers.ElapsedEventHandler(timer_Elapsed);
syncPoint = 0;
}
private void frmBlink_Load(object sender, EventArgs e)
{
label2.Visible = false;
timer.Start();
}
delegate void Blink();
private void BlinkLabel()
{
Blink del = (Blink)delegate { label1.Visible = !label1.Visible; };
if (label1.InvokeRequired)
label1.Invoke(del);
else
del();
}
void timer_Elapsed(object sender, System.Timers.ElapsedEventArgs e)
{
long sync = System.Threading.Interlocked.CompareExchange(ref syncPoint, 1, 0);
if (sync == 0)
{
try
{
BlinkLabel();
}
finally
{
syncPoint = 0;
}
}
}
private void button1_Click(object sender, EventArgs e)
{
timer.Stop();
while (System.Threading.Interlocked.Read(ref syncPoint) != 0)
System.Threading.Thread.Sleep(10);
label1.Visible = false;
label2.Visible = true;
}
}
}oh damn. Thanks dude. worked like a charm
But if I wanted to increase or decrease the speed that it's blinking at, I just need to increase 250, right? And to make it slower, I would just have to decrease the value?
To increase the blink speed you would decrease 250. The 250 means -- "Every 250ms toggle the label's visibility." So if you toggle the visibility every 1000ms it will be a very slow blink. If you toggle it every 1ms it will be a very fast blink. You might not even be able to see it, you would have to test :)
Please mark this thread as solved if you have found an answer to your original question and good luck!
oh lol okay. My bads. Thanks :D
oh I have another question about this =]
I had decided to add in another or so. And I want to ask how would I make it so, llike, I have the blinking label stop with timer.Stop(), and then I have the next label appear. But I would like for, after a while, after the new label appears, to revert back to the blinking label.
For example, I have a label already saying ''Status'' and under it is the blinking label, ''Waiting...''. When I press the button, the code will go and the new label will appear saying like, ''done'', then I want like, 5-10 seconds to pass and the label, ''Waiting...'' will appear again :D
i couldnt open the project, is it 2008?
I opened it without prevail o.o
skanke answer pweeze =]
i couldnt open the project, is it 2008?
Yes
Be sure to copy/paste this code. I change syncPoint all over the place and if one of the values gets moved over wrong then it wont work:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using Timer = System.Timers.Timer;
namespace daniweb.timer
{
public partial class frmBlink : Form
{
private object __timerLock;
private bool TimerRunning
{
get
{
lock (__timerLock)
{
return timer.Enabled;
}
}
}
private Timer timer;
/// <summary>
/// 0: The timer is available for the next elapsed event
/// 1: A thread is busy with the timer's elapsed event
/// 2: The timer is in a stopped state
/// </summary>
private long syncPoint;
public frmBlink()
{
InitializeComponent();
__timerLock = new object();
timer = new Timer();
timer.Interval = 250; //0.25 sec
timer.AutoReset = true;
timer.Elapsed += new System.Timers.ElapsedEventHandler(timer_Elapsed);
syncPoint = 2; //NOTE the value change here
}
private void frmBlink_Load(object sender, EventArgs e)
{
labelStatus1.Visible = false;
labelStatus2.Visible = false;
//timer.Start();
StartTimer();
}
delegate void Blink();
private void BlinkLabel()
{
Blink del = (Blink)delegate { labelBlink.Visible = !labelBlink.Visible; };
if (labelBlink.InvokeRequired)
labelBlink.Invoke(del);
else
del();
}
private void StartTimer()
{
if (this.TimerRunning)
throw new InvalidOperationException("The timer is already running.");
if (System.Threading.Interlocked.Read(ref syncPoint) != 2)
throw new InvalidOperationException("The syncPoint value is not in the correct state for the timer to start");
lock (__timerLock)
{
System.Threading.Interlocked.Exchange(ref syncPoint, 0);
timer.Start();
}
}
private void StopTimer()
{
if (!this.TimerRunning)
throw new InvalidOperationException("The timer is not running.");
lock (__timerLock)
{
timer.Stop();
}
while (System.Threading.Interlocked.CompareExchange(ref syncPoint, 2, 0) != 2)
System.Threading.Thread.Sleep(10);
labelBlink.Visible = false;
}
void timer_Elapsed(object sender, System.Timers.ElapsedEventArgs e)
{
long sync = System.Threading.Interlocked.CompareExchange(ref syncPoint, 1, 0);
if (sync == 0)
{
try
{
BlinkLabel();
}
finally
{
System.Threading.Interlocked.Exchange(ref syncPoint, 0);
}
}
}
private void buttonFirstOperationComplete_Click(object sender, EventArgs e)
{
StopTimer();
labelStatus1.Visible = true;
}
private void buttonSecondOperationBegins_Click(object sender, EventArgs e)
{
labelStatus2.Text = "Second operating starting...";
labelStatus2.Visible = true;
StartTimer();
}
private void buttonSecondOperationCompleted_Click(object sender, EventArgs e)
{
labelStatus2.Text = "Second operating complete";
StopTimer();
}
}
}Thanks for the coding its help me too with the help of timer, i can blink my label.
Please mark this as solved.
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