I was wondering if it someone could help me solve this problem. I have a full screen application with a panel in the center which is used to display different user controls and screens when the user uses the app.However, I have a rather large gradient image set as my form's background and it causes the panel to flicker every time controls are added. I find that when the background image is removed the flicker goes away. How can I keep the background image but eliminate the flicker? My form is already double buffered.
I have a htpc project that I am working on. The main program loads dll plugins which are basically other win forms. On each of these forms, including the main program, I use a picturebox (a double buffered picturebox) for the background image and then draw everything on it by hand. Whenever I load the form from the dll and show it, I get a weird flicker. It looks like it is the previously used double buffer. Is there any way to clear the background double buffer before the flicker? Or am I going in the wrong direction?
Here's a couple of videos of the problem: [url] [url]
Notice the black screen with the white lines on it or the flash of the desktop after I click "Movies." How do I get rid of that?
I have a htpc project that I am working on. The main program loads dlls which are basically other win forms. On each of these forms, including the main program, I use a picturebox (double buffered picturebox) for the background image and then draw everything on it by hand. Whenever I go from the main program to the dll, I get a weird flicker. It looks like it is the previously used double buffer. Is there any way to clear the background double buffer before the flicker?
I have a 18kb 1024 x768 jpeg image that is set as background image of my form. The problem is the form now lags like crazy. How can I eliminate the lag?
I am using a MDI form and child forms. Now I don't like the standard back colour of mdi form so I got code on the net which paints a gradient colour to the mdi. So far it is working okay.Now the problem is when I load a child form or close it or do a similar activity then it causes flicker in the mdi background. This gets pretty annoying at times and you see the background flicker.
To recreate this behaviour, you need to create a pop-up form with the following properties:
(1) ShowInTaskBar = False
(2) Display the form with the Show method and loop until the form is not Visible.
(3) In order to close the form when the mouse is clicked out of it, override OnDeactivate, and set visible to False.
Next, create another form that will display the pop-up when a button is clicked:
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As Syste Using pop As New PopUp pop.Visible = True
[code]....
it also puts a black border around the form. (You'll have to set FormBorderStyle = System.Windows.Forms.FormBorderStyle.None to see this.)what this style does apart from putting the black border round the form?
I know when I draw to the form and add controls I get a flicker effect.If I draw to a picturebox on the form and add controls will the picturebox flicker?
When I double click on a form control while in the design view in a Web Application project within Visual Studio 2010, say a 'button' or a 'submit' for example, it inserts a javascript function into my .aspx file. When I do this at work it automatically creates an event handler for the control in the code-behind.How do I change this to that setting?I don't want to type those event handler subroutines every time!
The title pretty much precisely asks the question, but I shall repeat;
When I double click on a form control while in the design view in a Web Application project within Visual Studio 2010, say a 'button' or a 'submit' for example, it inserts a javascript function into my .aspx file. When I do this at work it automatically creates an event handler for the control in the code-behind.How do I change this to that setting? I have used '/resetsettings' already, and other answers to similar questions do not solve my problem. I have reinstalled, gone through every menu I can find (though I may have missed something)I don't want to type those event handler subroutines every time!
Here's the catch - for the program I'm making I would like to avoid creating a copy of the file in its totally unencrypted state (I'm using a modified, quick-and-dirty XOR cipher for that. It's secure enough for my purposes and faster than the stronger encryption). Anyhow, what I would like to do is read a block of data, de/encrypt it (in memory) and then write the changed bytes to the same location they previously would have been within the file.
I've found the problem a little outside my programming abilities, so I was wondering if anybody had a pre-made solution, links to appropriate examples, or an all out explanation.
I am capturing Frames from a camera and storing the RAW DATA of the picture(frame) in a buffer(declared as Byte). Now my question is that: Is it possible to display the Image onto a picture box directly from the Raw Data stored in a Buffer, without converting it to a Bitmap or any other Image type? If so how to do this?
I've asked this question before, and so have many before me, i have done extensive research on the topic and stil no help. Maybe this is some kind of secret info. shared only amongst top programmers. Bt how do you really, trully double buffer a form, aside from setting "Double Bufferd" to true, which doesn't work in most cases, I want to know how do companies lyk Microsoft and Symantec, prevent flashes on big applications such Word and Norton.
my app is calling a dll that returns SQL details to a bufferred string, here is what i did 6 Dim server As New String(" ", 256) when i use this in sql connection string i get this error: Format of the initialization string does not conform to specification starting at index 22.
I have a situation where I am handling both single & double mouse click events on a form. In both cases something has to be loaded, however when a double click occurs, I do not wish to execute the code attached to the single click event.Is there a way to intercept the mouse click's and check if double or single and then execute the right event appropriately?
I have just run into an issue of screen flicker that I haven't been able to solve. I have a panel with dozens of controls on it. Painted onto the panel, behind the controls, are a few colored rectangles.
Those rectangles flicker whenever the mouse is moved over any control, or off the panel. Basically, a paint event for the panel is raised whenever the mouse leaves the panel.
Therefore, I thought that if I only painted the rectangles when they needed to be painted, not every time the Paint event was raised, that I would be able to avoid the flicker. After all, there is no obvious reason why they would need to be re-painted just because the mouse moved over a control on the panel.
the paint event was still being raised, and the panel just wasn't painting the rectangles, so they weren't being drawn at all (but they sure didn't flicker). So, the flicker is being caused by the fact that the paint event clears the panel, which gets displayed in a cleared state for a fraction of a second, then the rectangles are drawn in.
Doublebuffering the form has no discernible impact, which may well be because the screen draws the absence of the rectangles on one frame, then draws the presence of the rectangles on the next frame. They both get shown in sequence, so the rectangles appear to flicker badly.
One obvious alternative is to not even draw the rectangles, which works great, and they are only useful visual guides, not essential components. Still, that doesn't seem like a good solution.
So what I am looking for is a way to supress the display of the undrawn image before showing the finished image.
Straightforward question: I have a few variables that are doubles. I would like to be able to store a "null" state in them, i.e. I need to be able to represent that the variable doesn't contain valid data. I'd really rather not associate a boolean "is valid" variable with every single double
My application is runs without any external dependencies like .dlls. When I run my app, the controls flicker on as it loads. It's not terrible, but it's annoying and kind of takes down from the professionalism. I was trying to figure out what was causing it and found out that it was my background image. My background image is a jpeg and I guess it is too large. Is there a way I can get it to load the image better so my controls don't flicker or maybe use a different file type that is smaller?
I'm using VS2005. On my old Win XP AMD computer, I developed a stock price chart in VB.net which I could scroll left/right with Hscrollbar. However my old PC failed due to faulty AMD motherboard. Now I'm using an Intel PC with Win XP and same VS2005. My VB.net solution has compiled and runs as it did before - with this difference. Sometimes my scrollbar flashes and sometimes it doesn't. Another thread mentioned "too many controls causing flicker" - but my Form does not have many controls on it. I can't find a property that mentions "flashing" when I search the scrollbar class members.
Whenever I load or close child forms or other form (for that matter) then there is flickering in my MDI form. The flickering maybe because the form may be getting painted with gradient or so. Now this flickering is really noticable and I need to solve this. I am pasting the code that I am using to paint my MDI form. If you guys think the code is in efficient then let me know. Or if there is any fix or other way to go about it then I would like to know.
CODE - written inside my MDI form.
Public Class MdiContainer Inherits Control Private WithEvents MdiPane As Control
I have this:vb Private Sub ImageShop_DoubleClick(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.DoubleClick openFile.ShowDialog()End Sub Which is supposed to show my dialog box when someone double clicks on the form, but that doesn't work.
I have a menu item that is single click, and that works fine. Why doesn't the double click work when someone double clicks on the form?
I would like to know if Visual Studio does have a setting where you can choose whether it should write nombers like 0.00000127 in scientific notation or not? I am writing such doubles to file but VB2008 writes them in scientific notation. If I treat these numbers as decimals then it writes them correctly, but I also have to take care of performance as I'm writing lots of numbers.
change my MDIClient's background image I've decided that painting over it is the best way to go (because of scaling). Problem is, when the form (and the MDIClient) get scaled/resized, there's massive flicker even with the ControlStyles and form double buffering.
Public Class frmMain Dim BGimage As Image Sub New()
I used advice from this site to set the DoubleBuffering property of a Panel to true.url...However, I don't see my new control in my toolbox. To get by I have drawn regular panels in my designer window and then altered the designer file to my new class. This causes headaches though when the designer doesn't open correctly (sometimes it works, other times I get a "variable is undeclared, unassigned error)..How do I get a simple custom control into my toolbox?
I am making an application using VB.NET 2010 and I have set a background image which flickers every time I open any new Form or hit tab for jumping from textbox to textbox By pressing (tab) it only flickers once but always flicker when ever I close the form and open again. I have tried everything; background image set to, STRETCHED, CENTRE, ZOOM but still it's the same.
i have been working on an app, that remains just my preset sizes. recently, i have discovered that by double clicking the form title bar, even w/the formborderstyle being set to fixedtoolwindow, the form still maximizes and all of my controls remain in the top/left corner.. not a good view.. so, i set the maximum size of the form, and now when double clicking it, moves it to the top/left of my desktop.. not a good result. here is a quick sample to start w/.
Public Class Form1 Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
[Code]....
how do i permanently block the double click on the title bar, to have no effect on the form? i do not want to end up w/having to create a borderless form just to avoid this..
