Sleep() in Window Form Application with visual C++

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Hello everyone!

My question is related to Window Form Application and System::Threading::Thread::Sleep(int delayTime) in Visual C++.

My window form has a panel, in which there are 3 ovalShape named ovalShape1, ovalShape2 and ovalShape3. A button name button is next to the panel. Button is associated to a click event. What I need is when I click the button, the color of every oval shape will be changed to red after every 1 second (1000 miliseconds).
This is what I’ve done:

private: System::Void buttonClick(System::Object^  sender, System::EventArgs^  e) {
			  
	this->ovalShape1->FillColor = System::Drawing::Color::Red;
	System::Threading::Thread::Sleep(1000);
	this->ovalShape1->FillColor = System::Drawing::Color::White;

			
	this->ovalShape2->FillColor = System::Drawing::Color::Red;
	System::Threading::Thread::Sleep(1000);
	this->ovalShape2->FillColor = System::Drawing::Color::White;

	this->ovalShape3->FillColor = System::Drawing::Color::Red;
	System::Threading::Thread::Sleep(1000);
	this->ovalShape3->FillColor = System::Drawing::Color::White;

}

But for some reason (I don’t know), the application doesn’t work the way I have expected. The ovalShape1 just flashes and that’s all.

Maybe you know the reason!

Any help or suggestion would be appreciated!

[enhzflep: CLI tag added to question]

Posted 30-May-12 0:39am

svatstika

Updated 30-May-12 0:54am

enhzflep

v4

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Maximilien · Answer 1 · 2012-05-30T00:47:00

Solution 1

The Sleep will just suspend/stop everything; nothing will happen; not even a redraw.

You could use a timer instead (SetTimer) to change the color, or use a thread (overkill IMO).

I'm at home right now (no compiler, yeah, a developer with no compiler at home!); so I can't try it out.

Max.

Posted 30-May-12 0:47am

Maximilien

Comments

svatstika 30-May-12 21:45pm

Well, thank you very much for the reply. I have one more question. What should I do if I just want some Timer working only after I clicked on a button?

svatstika 30-May-12 21:58pm

Hi Maximilien, I think I've found the answer for the question above. That is timer->Enabled == true or false.

CPallini · Answer 2 · 2014-04-29T10:07:00

Solution 3

Have a look at this article: "C++ .NET Programming - How To Make A Simple 2D Animation Using Timer on Windows Forms Application"[^].

Posted 29-Apr-14 10:07am

CPallini

Comments

Nelek 29-Apr-14 17:35pm

Carlo, you got a littel bit late for this question :P

CPallini 30-Apr-14 3:34am

:-D
Who knows? Possibly the OP is still waiting for a solution. Shame on me!

Nelek 30-Apr-14 12:25pm

Don't be so hard with you. You just got fooled by the question being "awaken" with the other solution.
There is always the positive side: It can help other people having similar problem

EricJerome · Answer 3 · 2014-04-29T08:18:00

Solution 2

I had a very similar that I found could be solved using Application::DoEvents() before the sleep function. This way, the command to color in the form will be processed before the sleep function:

this->ovalShape1->FillColor = System::Drawing::Color::Red;
Application::DoEvents();
Sleep(1000);
this->ovalShape1->FillColor = System::Drawing::Color::White;

Posted 29-Apr-14 8:18am

EricJerome

Comments

[no name] 29-Apr-14 14:52pm

The use of DoEvents is almost always the major red flag of a bad design.