C# Discussion Boards - CodeProject

Re: Flicker with transparent labels on different panels

7-May-08 23:08

I have a Form with a Panel mainBackPanel. To mainBackPanel I add different panels say redPanel, greenPanel, bluePanel depending on key pressed, r, g, b respectively. Each panel has a different image (say tomatoes, trees, sky) and a transparent label.

Now when the panel changes, I see a small flicker on the area covered by the label.

mainBackPanel (to which the individual panels are added) is double buffered.

The code, in .NET 2.0, can be found here[^].

You will need to put 3 image files namely fb.jpg, mf.jpg and pl.jpg in bin/debug folder prior to running the app.

Please suggest how to get rid of the flicker.

Thanks
Sukhjinder

Looking for help on my OpenSource Media Player LetsYo

phannon⁸⁶7-May-08 23:10

phannon⁸⁶

7-May-08 23:10

Before you do any processing on the images, use SuspendLayout[^] and when you're done use ResumeLayout.

He who makes a beast out of himself gets rid of the pain of being a man

No change on Suspend/Resume Layout

Sukhjinder_K7-May-08 23:16

Re: No change on Suspend/Resume Layout

7-May-08 23:16

All KeyEvents are being handled by MainForm in the following method

void mainFormKeyUpHandler(Object o, KeyEventArgs kev)
{
	if( kev.KeyCode == Keys.R )
	{	
		this.mainBackPanel.Controls.Clear();

		this.mainBackPanel.SuspendLayout();	
		this.mainBackPanel.Controls.Add(this.mainFormPanel);
		this.mainBackPanel.ResumeLayout();
	}
	else
	.
	.
	.
}

<br />
<br />
But the result is still the same. <br />
<br />
<div class="ForumSig">Looking for help on my OpenSource Media Player <a href="http://sukhjinder.cn/letsyo/contribute.html">LetsYo</a></div>

phannon⁸⁶7-May-08 23:26

phannon⁸⁶

7-May-08 23:26

Move that suspend before Controls.Clear() as that may also cause some flickering. Might solve it for you.

He who makes a beast out of himself gets rid of the pain of being a man

Doesnt work

Sukhjinder_K7-May-08 23:28

7-May-08 23:28

Tried that too. It doesn't work.

Looking for help on my OpenSource Media Player LetsYo

Some workarounds...

Sukhjinder_K9-May-08 2:54

9-May-08 2:54

I searched the web and found many people having similar problems. Typical scene is you remove a control and add a new one. This causes a flicker. I searched the Internet and found some potential solutions but couldn't understand them much. Can you help me with it?
Solution #1[^]

Solution #2[^]

Solution #3[^]

Looking for help on my OpenSource Media Player LetsYo

Drag & Drop & More

willy20057-May-08 23:07

willy2005

7-May-08 23:07

Hi.
i'm developing an application in c#.
The first part is a typical application with forms, database queries, etc...
In a second phase, i need to design a panel with several buttons, with different captions, each button represent a complex vector shape with textures, for example a table, a computer, a tv...

When the user clicks on a button, a shape appears in a canvas. The user can drag and drop the shape and resize it.
If the user resize the shape, the texture must auto-adjust to the new size (tile effect).

In addition, it is necessary to implement a collision detector, to prevent "illegal positions".
f.e.: The table only can be placed in the floor and the tv only over the table, etc..

I need to chose an option (WPF, DIRECT2D, GRAPHICS CLASS ...)

1. ¿What option you recommend me?
2. Someone knows open source libraries or similar examples?

Thanks in advanced and sorry for my basic english Blush | :O

How to delete Cookies

Waheed Ur Rehman7-May-08 22:38

Waheed Ur Rehman

7-May-08 22:38

i am using the following code

System.IO.File.SetAttributes(Environment.GetFolderPath(
Environment.SpecialFolder.Cookies ).ToString(), FileAttributes.Normal);

DirectoryInfo directory = new DirectoryInfo(Environment.GetFolderPath(Environment.SpecialFolder.Cookies));
if (directory.Exists)
DeleteFiles(directory);

public void DeleteFiles( DirectoryInfo directory)
{
FileInfo[] info = directory.GetFiles();
foreach (FileInfo file in directory.GetFiles())
{
try
{
System.IO.File.SetAttributes(file.FullName, FileAttributes.Normal);

file.Delete();
}
catch (Exception ex)
{

}
}
foreach (DirectoryInfo dir in directory.GetDirectories())
{
try
{
DeleteFiles(dir);
}
catch (Exception ex)
{
}
}

}
This code is deleting all files in the Cookie folder but the problem is index.dat file remains there it gives error
Used by another person or program
What should i do to delete that file
Thanks

Ashfield7-May-08 23:56

Ashfield

7-May-08 23:56

index.dat is a system file and should not be deleted.

Find out more here

Bob
Ashfield Consultants Ltd

Waheed Ur Rehman9-May-08 2:04

Waheed Ur Rehman

9-May-08 2:04

but cookies get restored

Ashfield9-May-08 22:37

Ashfield

9-May-08 22:37

Obviously they will, when you visit a website that uses them. However, your questions was about deleting index.dat, which has nothing to do with the cookies.

Bob
Ashfield Consultants Ltd

boblaw9911-May-08 16:16

boblaw99

11-May-08 16:16

You can use windows API to delete all the cookies.
The functions below are useful:
FindFirstUrlCacheEntryEx, FindNextUrlCacheEntryEx, DeleteUrlCacheEntry.
They are defined in wininet.dll.

Process.Start() Issue

Harvey Saayman7-May-08 22:27

Re: Process.Start() Issue Cont....

7-May-08 22:27

Hey guys

i need to run external console programs from within a console program... this i can do but the snag comes in were i have to wait for process1 to finish before i start process2

heres what i have

static void Main(string[] args)
{
    ProcessStartInfo process1 = new ProcessStartInfo("ring.exe");
    Process.Start(process1);

    //
    // Wait For process1 to finnish
    //

    ProcessStartInfo process2 = new ProcessStartInfo("ringLouder.exe");
    Process.Start(process2);

    Console.Read();
}

any ideas?

thanx

Harvey Saayman - South Africa
Junior Developer
.Net, C#, SQL
think BIG and kick ASS

you.suck = (you.passion != Programming)

Harvey Saayman7-May-08 22:38

7-May-08 22:38

Ive now seen that when the process class is used as an instance there is a WaitForExit() method

but now i'm getting an error on myProcess.Start("ring.exe"); " System.Diagnostics.Process.Start(string)' cannot be accessed with an instance reference; qualify it with a type name instead "

here is the code

Process myProcess = new Process();
myProcess.WaitForExit();
myProcess.Start("ring.exe");

thanx

Harvey Saayman - South Africa
Junior Developer
.Net, C#, SQL
think BIG and kick ASS

you.suck = (you.passion != Programming)

Spunky Coder7-May-08 22:39

Spunky Coder

7-May-08 22:39

try use the following

//Wait for window to finish loading.
process1.WaitForInputIdle();
//Wait for the process to exit or time out.
process1.WaitForExit(5000);

.....

Harvey Saayman7-May-08 22:43

7-May-08 22:43

hey

those methods are in an insance of the Process class, my "process1" is an instance of the ProcessStartInfo class

plz read my 2nd post Process.Start() Issue cont...

thanx

Harvey Saayman - South Africa
Junior Developer
.Net, C#, SQL
think BIG and kick ASS

you.suck = (you.passion != Programming)

Spunky Coder7-May-08 22:48

Spunky Coder

7-May-08 22:48

oops..i haven't noticed it .

.....

Harvey Saayman7-May-08 22:50

7-May-08 22:50

its okay

i found the sollution

here is what i needed to do...

Process myProcess = new Process();
            
            myProcess = Process.Start("ring.exe");
            myProcess.WaitForExit();

thanx for trying tho

Harvey Saayman - South Africa
Junior Developer
.Net, C#, SQL
think BIG and kick ASS

you.suck = (you.passion != Programming)