Windows Forms

Flickering Problem [modified]

12-Sep-09 5:49

Does A New .NET Reporting Way[^] not help?

Henry Minute

Do not read medical books! You could die of a misprint. - Mark Twain
Girl: (staring) "Why do you need an icy cucumber?"
“I want to report a fraud. The government is lying to us all.”

geali_dor10-Sep-09 22:21

geali_dor

10-Sep-09 22:21

Hey there,

i am programming a charting Libary for my Financial Suit. Therefore my idea was to have a Panel that has Lists of all my shapes (Line, Pie, Bar etc.)

Wenn i resize my Panel the whole shapes are flickering very much.

i googled and codeprojected a few days but i got no satisfying answer.

Control.SetStyle(ControlStyles.OptimizedDoubleBuffer, true)

...does unfortunately not work, because, when i set this style, the shapes only appeare frequently on resizing, but when the resizing is finished (MouseUp) the Panel is empty (white; and if i override the OnPaintBackgound and comment the base.OnPaintBackgound out it is black)

Does anyone know about this problems or had the same?
Do i need some more Styles etc?
Do i have to override some methods or properties?

[Edit]
Hey there,

i finally figured it out:
the problem is, if i use Control.SetStyle(ControlStyles.OptimizedDoubleBuffer, true) and an object uses Control.CreateGraphics() it will only be painted while resizing and not when resizing is finished! Now i'm using public void Draw(Graphics g) instead of public void Draw(ChartingSketch sketch) and now it works!!
[/Edit]

hack the planet

modified on Sunday, September 13, 2009 4:28 AM

Re: Flickering Problem

Henry Minute12-Sep-09 5:51

Change Background image of form runtime

12-Sep-09 5:51

Without seeing at least some of your painting code, it is almost impossible to say.

Post the relevant parts of your code (enclosed in PRE tags, please), so that people can try to help.

There is no need to reply to this, just edit your original post. Smile | :)

Re: Flickering Problem

April Fans21-Sep-09 21:46

April Fans

21-Sep-09 21:46

because drawing in memory’s speed is much slower than showing to screen.
lead to Delay.
iam so glad to see you override the 'OnPaintBackgound ',
1) but i think you should can set 'form's double buffer property' to 'true',
2) or use a 'bitmap' to simulate 'double buffer'.

April

Comm100 - Leading Live Chat Software Provider

modified 27-May-14 22:02pm.

swapnil_bhanagle10-Sep-09 6:15

swapnil_bhanagle

10-Sep-09 6:15

Hi,
I need help with changing background image of WinFrom run time.
But i want to change the background image of selected area only not for whole form
the area is not just like square or rectangular or circle like that
for example i have passport size photo and in that at run time i want to change the image of face only
(Something like creating hotspot and changing the image of that spot only at run time )
i know this can be done if adobe photo shop.

is this possible in winform ?
if no then whether it is possible in asp.net ?

Re: Change Background image of form runtime

dan!sh 11-Sep-09 6:33

dan!sh

11-Sep-09 6:33

All I can think of is using DrawImage method of the graphics class and then covering the unwanted parts using Graphics object.

It's not necessary to be so stupid, either, but people manage it. - Christian Graus, 2009 AD

Re: Change Background image of form runtime

April Fans21-Sep-09 21:44

April Fans

21-Sep-09 21:44

if you change background image frequently in winform, will lead to ‘out of Memory’ exception.
you should consider to draw image by 'GDI+'.
of course, asp.net is possible to do it.
if you think it's hard to achieve it. try to learn 'silverlight'.

April

Comm100 - Leading Live Chat Software Provider

modified 27-May-14 22:03pm.

logical expression editor

r.ps9-Sep-09 19:00

r.ps

9-Sep-09 19:00

Hi!
Have you used or know of any logical expression editor controls? Some thing like whats seen here.
Googling for it did not turn up anything i could work with.
Any pointers in the right direction would be much appreciated.

Thanks!

Different Icon on the title bar than on the application tab

andy4009-Sep-09 10:50

andy400

9-Sep-09 10:50

Hi,

I’m developing a windows application using VS 2005. I’m getting a different icon on my task bar than I have in my title bar at runtime. I’ve recently edited my Icon. The Icon that displays down in the taskbar is the ‘old’ version of the icon and the icon in the title bar is the new version (Note: the icon in the taskbar is just a regular icon, I’m not working on a NotifyIcon). I’ve searched my application directory and I don’t see the old icon anywhere.

Could it be coming from a .dll or the GAC instead of the form’s .resx file?
Why would the tab have a different icon than the title bar?
Has anyone seen or heard of this type of behavior before?

Thanks,
Andy

Re: Different Icon on the title bar than on the application tab

Luc Pattyn9-Sep-09 10:57

Luc Pattyn

9-Sep-09 10:57

Hi,

Some comments on applications and icons:

1.
An application typically has two different icons:
- the application itself has an icon at the file level; it gets used by Windows Explorer; you set it as a project property. (right click the project in the solution pane, choose application tab, and specify the icon file/resource there)
- any form can have an icon; it is a Form property, that you can set through Visual Designer. It also shows up in the task bar's button (if the Form shows in task bar). A form’s icon, when set by Visual Designer, gets stored in the Form’s resx file.

2.
You can set a Form’s icon programmatically. An easy way to do that consists of:
- add the ICO file to the project;
- give the file the Build Action “embedded resource” so it gets included in the app’s resources.
- use one of the Icon constructors to get the icon resource, as in:
this.Icon=new Icon(this.GetType(), "name.ico");
- if the icon file is not at the top-level of the solution, add its relative path to the icon name; so if it resides in directory “resources”, change the above constructor statement to …"resources.name.ico");

3.
an icon file can hold multiple icons (icons at different sizes), and Windows will pick one depending on circumstances, so if they do not all look alike, you may get very confused.

4.
I tend to create icons programmatically; the following code converts a (best small,
square) image into a simple icon:

string filename=popupNode.getLongName();
try {
	Bitmap bm=(Bitmap)Image.FromFile(filename);
	if(bm.Width!=32 || bm.Height!=32) {
		bm=new Bitmap(bm, 32, 32);
	}
	Icon icon=Icon.FromHandle(bm.GetHicon());
	bm.Dispose();
	string filename2=Path.ChangeExtension(filename, ".ico");
	Stream stream=new FileStream(filename2, FileMode.Create);
	icon.Save(stream);
	log("Created icon "+filename2);
} catch(Exception exc) {
	log("Failed to create icon from "+filename);
	log(exc.ToString());
}

Luc Pattyn

Have a look at my entry for the lean-and-mean competition; please provide comments, feedback, discussion, and don’t forget to vote for it! Thank you.

Re: Different Icon on the title bar than on the application tab

andy4009-Sep-09 11:24

andy400

9-Sep-09 11:24

Thanks, that helps!

Re: Different Icon on the title bar than on the application tab

Luc Pattyn9-Sep-09 11:32

Luc Pattyn

9-Sep-09 11:32

you're welcome.

Smile | :)

Luc Pattyn

Have a look at my entry for the lean-and-mean competition; please provide comments, feedback, discussion, and don’t forget to vote for it! Thank you.

Re: Different Icon on the title bar than on the application tab

April Fans21-Sep-09 21:45

April Fans

21-Sep-09 21:45

when you use the icon at the first time.
it had been imported into .resx file.
so you should open the file, and delete the icon.

(you should look up toolbar's background-Image Property，
may be you will see the icon)

April

Comm100 - Leading Live Chat Software Provider

modified 27-May-14 22:02pm.

A problem with Generics [modified]

Henry Minute9-Sep-09 8:03

Regions with in a function

9-Sep-09 8:03

I have been wrestling with a problem for about four days now, and quite honestly I think it's winning. I'm down by two falls to one at the moment.
Since song parodies were mentioned in The Lounge recently, I thought I'd have a go.

My application won't compile
I've searched the thing all over the place
Googled till I was black in the face
I'm a big disgrace t' the Programmer race
My Application won't compile

You see what it's done, it's reduced me to a gibbering wreck.

Here's the problem.

I have a generic class, to save you reading through loads of code, for this explanation pretend that it is a Stack<T>, since the result is the same.

Now I want to create a Control StackVisualizer that can show a graphical representation of any Stack<T>. You know a set of vertically aligned boxes representing the items in the Stack<T>, so that you can see what happens with Push and Pop etc.

public partial class StackVisualizer : UserControl
{
  private Stack<T> workingStack = null;
  ..................
  ..................
  ..................
  ..................
}

That doesn't work, because T is not known at compile time.

OK so lets try:

public partial class StackVisualizer<T> : UserControl where T : IEnumerable<T>
{
  private Stack<T> workingStack = null;
  ..................
  ..................
  ..................
  ..................
}

Now this works, but StackVisualizer is no longer a visual control. I can put it on a Form and set its properties etc. but I have to do it in code, I cannot do it in the Designer.

Does anybody have any ideas?
Plzzzzzzzzzzz give me teh codezzzzzzzzzzzzzzzzzz!

modified on Wednesday, September 9, 2009 2:13 PM

εїзεїзεїз8-Sep-09 15:37

εїзεїзεїз

8-Sep-09 15:37

We cannot create Regions within a Function then what is the alternate to make group / divisions like regions within a body of a function
is their anything or not

Best Of Regards,
SOFTDEV
Sad like books with torn pages, sad like unfinished stories ...

Re: Regions with in a function

dan!sh 8-Sep-09 22:52

dan!sh

8-Sep-09 22:52

softdev_sup wrote:
We cannot create Regions within a Function

If it is C# you can.

It's not necessary to be so stupid, either, but people manage it. - Christian Graus, 2009 AD

Form Resizing and Docked Controls

farzadmf8-Sep-09 12:48

8-Sep-09 12:48

Hi everybody,
I have an issue with Windows Forms:
I created a Windows Form and docked a picture box to fill the entire form, but the problem I have is that the picture box's size change only when either "Width" and "Height" properties of the Form (or both of them) are increasing and in fact, if I resize the form so that it becomes smaller (both in Width and Height) the picture box's size wouldn't change.
To test this, I tried to update the Text property of the form in the Form's Paint event to reflect the picture box's Size property and when I'm making the Form smaller, neither Width nor the Height of the picture box is changing, any ideas?

Henry Minute8-Sep-09 13:04

8-Sep-09 13:04

Do you have the SizeMode property of the PictureBox set to AutoSize?

If that is so, could you please describe what effect, you are trying to achieve, so that people can suggest workarounds/alternative strategies. Smile | :)

farzadmf8-Sep-09 20:05

8-Sep-09 20:05

Thank you for your reply:
Firstly, the picture box's SizeMode property determines how the size changes according to the size of the picture being shown in the picture box.
Secondly, I want to achieve a condition in which resizing the Form ALWAYS causes the picture box's size to change even when both Width and Height properties of the form are decreasing; and in fact, as soon as every one of them begins to increase, the picture box's size is also changed.

Henry Minute9-Sep-09 7:35

9-Sep-09 7:35

I'm sorry that I have taken so long to answer your post.

However, you did not answer my first question.

farzadmf wrote:
Firstly, the picture box's SizeMode property determines how the size changes according to the size of the picture being shown in the picture box.

I know this already, I asked what you had SizeMode set to in your application.

farzadmf9-Sep-09 10:05

9-Sep-09 10:05

SizeMode is set to Normal, but I tried with AutoSize but it didn't make any difference.

Henry Minute9-Sep-09 10:56

9-Sep-09 10:56

This is very odd. I have never noticed this behaviour before.

I had thought that there might be a problem if SizeMode was set to AutoSize, because of some strange conflict between it and the Dock.Fill property.

But, as you say, it happens with SizeMode.Normal too. I even tried Dock.None with Anchor set to Top, Left, Bottom, Right, but it was exactly the same.

I am at a loss.

There are two Articles here on CP that (supposedly) have PictureBox functionality without actually using a PictureBox. In case they are of help in your situation, they are:
C# Scrollable Picturebox Custom Control[^]
and
A Zoomable and Scrollable PictureBox[^].

When people post here asking for advice on PictureBox problems, I usually tell them not to use a PictureBox, as it is an awful control. You have given me an extra bullet to use.

Between the PictureBox and ImageList, Microsoft don't seem to be very good with images, do they?

Sorry not to be able to offer more help. Frown | :(

farzadmf9-Sep-09 11:45

Re: Form Resizing and Docked Controls [Hold the Front Page]

9-Sep-09 11:45

Don't mind please. It's OK.
Anyway thank you very very much for your concern. I will surely check the controls you mentioned.
Thank you again.

Henry Minute9-Sep-09 11:10

9-Sep-09 11:10

I'm not sure that you are correct.

Simple Form, PictureBox.

public Form1()
{
    InitializeComponent();

    this.Form1_ResizeEnd(null, EventArgs.Empty); // just to get the correct caption
}

private void Form1_ResizeEnd(object sender, EventArgs e)
{
    this.Text = string.Format("Form1 [{0}, {1}] - {2}", this.pictureBox1.Width, this.pictureBox1.Height, this.pictureBox1.Dock);
}

Connect the ResizeEnd event of the Form to the handler above.

All now appears to be hunky-dory.

What do you think?