Transparent Control Shows Up As Black
Aug 6, 2009
Im working on in VB.net. Basically I�m trying to create a nice looking control that draws several PNG images (stars in this example) that light up as you hover the cursor over them. This side of things is working perfectly (see picture 1).
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The problem is trying to make it work using a transparent background for the control. I can make the control transparent by setting the controls back color and using Me.Setstyle to enable transparency support, but every time the image refreshes to show any lit stars it repaints over the stars again � making the shaded areas darker each time. This results in a horrible mess (see picture 2).
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Next I tried to clear the background each time a repaint occurs so that the stars are drawn on a blank canvas each time to stop this problem. The only way I know how to do this is to use graphics.clear(Color.Transparent) before my code to paint the star images. But this does not work as the control shows a black background instead of a transparent one (see picture 3)!
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away the background to leave me with a transparent canvas to paint images onto? And is anyone smart enough to come up with a solution to this irritating issue?
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Jul 9, 2010
I've added a ribbon bar to the top of my main form using the DotNetBar and the problem is that it shows a black rectangle area instead of the default blue color. This only happens when I am using Windows 7 aero and is not maximized.
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Aug 29, 2011
I have created tooltips on a form from the toolbox and defined them as owner draw. I tied them to either a panel or a grid and they show up as black boxes the size that would contain the text that is assigned. If I had two areas next to each other, the text shows up. Neither the background or the forground color is black, so the black of the box is not from a color assignment. This has worked at one time and I do not know what changed.
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Feb 3, 2012
When the dialog pops up, the screen dims down almost as if they overlapped the screen with a transparent black layer of some sort. This is easily accomplish able by creating a black form and having its opacity set to half and starting it maximized-which I'm already doing. The problem with this though is I need to do this within a form, so using a panel or anything is out of the questions since transparency really grabs the background image and not the actual controls underneath. Plus I feel if adding a form to another forms controls depletes it's ability to use it's opacity property.The form I need this in is my cash register. It is full screen but if my menu auto hides it still resizes. It has two parts, the order(panel to the left) and the payments(panel to the right). As you could imagine I want the payments portion blacked out until the order is capable of accepting payments(the payment due is greater than 0). Or I'm thinking it fallows the mouse, you mouse over the payments and the orders panel blacks out, and vice verse.
Plus I have tried googling this but no one seems to have the answer on other forums.. Everyone gets confused and the thread ends short with no solution. Apparently though experts-exchange has the answer, but wants me to pay... so no. Wish their site would stop showing up in my google results.But did have an idea of what I could do. My best guess was I could take a snap shot of just the panel I want to black out. Set it as the background image for that panel THEN use my overlay panel(back color sent to black) overlapping the appropriate section with it's transparency set to half.. But still I'm not sure how to take a snap shot of just a particular.control..
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Feb 8, 2009
I have a form with transparent background (using png file).All controls placed over it becomes black at start then they change there color and comes to there original state on MouseHover. Its not the transparency keys problems since the transparency key color is different that controls back color. What can be the problem?
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Aug 15, 2010
I have a image with a transparent background. I clone it, rotate it, and save it in a picture box. Works fine (in that I can see the original object overlaid on the background image below it). However, the original unrotated image is also superimposed on the .image layer *with* the rotated one. Try as I can, I can't stop it from appearing.
Curiously enough, if I change the image to non-transparent (a .bmp instead of a .gif, for example), I don't have the problem. Of course, I also can't see the background {:<(
Code snippet:
Dim myGraphic As Graphics
Dim m As Image
m = ArtHorImage.Clone
[Code]....
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Sep 18, 2009
I can't remember exactly if this is possible or not but what I am attempting I would think should theoretically be possible. I know it is possible in WPF but the company I am working for doesn't want to make the transition just yet. Basically what I want is to use a background image on a form for the background and I have a docked control on the right and left. I have set the background on both of these docked controls to transparent however it is showing the back color rather than the background image. I tried, rather than setting the background image property, to override the onpaintbackground and onpaint events and use e.graphics.draw(picture, me.clientrectangle) but it still seems to just pick up the backcolor as the true transparent background so I'm wondering if it's possible to get it to show the background image through the control rather than the backcolor of the form?
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Jul 9, 2009
I'm trying to make a label control transparent over a Panel control.However by setting the background colour of the label to Transparent, it actually sees right through to the form itself, not the panel as intended.
As an example we use a panel with a background as white, we make the label transparent, however it gets the form�s colour as blue.However, we are using a custom panel control and need the label to be transparent over the panel and not see the forms background.
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Jul 9, 2009
I'm trying to make a label control transparent over a Panel control. However by setting the background colour of the label to Transparent, it actually sees right through to the form itself, not the panel as intended.
As an example we use a panel with a background as white, we make the label transparent, however it gets the forms colour as blue. However, we are using a custom panel control and need the label to be transparent over the panel and not see the forms background. Is this possible?
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Jul 9, 2009
I'm trying to make a label control transparent over a Panel control. However by setting the background colour of the label to Transparent, it actually sees right through to the form itself, not the panel as intended.
As an example we use a panel with a background as white, we make the label transparent, however it gets the forms colour as blue. However, we are using a custom panel control and need the label to be transparent over the panel and not see the forms background.
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May 19, 2010
How does the CheckBox control draw that black check mark in the white box? I can't install .Net Reflector or anything here on my work machine so could someone post the code (vb.net or c# is fine with me)?
Or if anyone knows how to do it (I have an 8x8 Bitmap object I'm drawing on already) I'd like a hand since my math isn't working out correctly[code]...
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Aug 16, 2011
I'm having a weird problem with a custom Web Control in an ASP.NET forms application. For a web application, I figured that it would save me a lot of time to create a class which inherits from CompositeControl which combines a label with some other control such as a TextBox or DropDownList. This composite control has several properties that wrap properties of the underlying properties (e.g.: EnteredText wraps TextBox.Text). The controls can be used for databinding in the same way as the regular ones, but instead of txtBox.Text = someObject.someProperty you use compositeControl.EnteredText = someObject.someProperty. These controls are then used on ASPX pages and ASCX user controls.
[Code].....
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Apr 28, 2009
I'm trying to make a web style button with user control. I need to make User Control's background transparent. How to do this without making controls invisible. Also I'll need transparent Label and PictureBox.
Trying to make something like this:
this.SetStyle(ControlStyles.SupportsTransparentBackColor, true);
this.BackColor = Color.Transparent;
[code].....
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Dec 16, 2010
I have been looking in a lot web site and forums trying to find the way to make my picturebox background transparent or catch whatever I drew on top of a transparent panel, let's explain it.
Case 1-) I trying to make an app, where the user can load onto the winform a word document(I have part this ready), then I put on top of the control where the doc. is loaded a transparent panel(this part is ready too) and the user can sing (on top the panel) then I need to get the user's draw(sing) and print it in the document.
Every time that I try to do it always I get everything that is within the panel area, then I just want the user's sing.
case 2-) I tried to use a picturebox then it works perfect, I can get just the user's sing and print it back in the document, but the problem is, I can't put a picturebox on top of the control where the doc. is loaded because then I can't see the doc.
If anybody wants to see the code to make the panel transparent, or catch whatever you draw on top the pictureBox.
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Feb 21, 2012
[Code]....
So i have that code in my xaml and the button gets filed with a list of string. Depending on what the users chooses on previous Usercontrol that item will be filed with differents items. The problem is if the user select one option at the first run the button will be filled correctly but if the user go back and select the other option the control doenst update and shows the same as before.. My english is not the best but i think i could made me understand! PS: the bindind on Button is to a readOnly property so i cant define it to Mode="TwoWay".. i took a look on the debug and the property ExportFormat gets updates with the new items but the usercontrol still displays the first option!!
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Oct 17, 2011
I did some research on how to make transparent User Control, The suggested code was like this:
Private Sub New()
' This call is required by the Windows Form Designer.
InitializeComponent()
' Add any initialization after the InitializeComponent() call.
Me.SetStyle(ControlStyles.SupportsTransparentBackColor, True)
Me.BackColor = Color.Transparent
UpdateStyles()
End Sub
When I build the project, there is no errors. But, When I try to load my user control using the "Choose ToolBox Items" dialog, it gives me the following error message:
"There is no components in [dll path] that can be placed on the toolbox."
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Nov 14, 2011
I am looking for a VB control that operates as a more or less transparent or semi-transparent ruler or bar that can be scrolled up and down the form over an invoice or letter, so that the user can see what is under the ruler/bar and thus stop scrolling when he reaches a certain point.
To give a bit more detail of what I am looking for - such a bar is used when someone is setting the focus on a line of a long list of items so that they know where they are all the time. Most people would use a ruler on a paper list to keep track of how far they have progressed down the list. It would be nice though to have the "ruler" or bar as semi-transparent so that the user can see under where he is at on the list or form.
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Mar 24, 2012
i know that VB.net and above don't use true transparency(and maybe true opacy) except forms, but even them have 1 visual bug. because if the we put the backcolor igual to transparent key, the picturebox is transparent... but give us a form hole.i found several codes that do transparency, but i see 1 problem on them, because the control needs time to be transparent.[code]some codes(that i founded on internet) are diferent but give us the same result.can anyone explain to me why the control needs so many time to show transparent?(i have tested using the keyboard to move the control, and i see the control is like visible and then hide and then visible. and if i continue click on key, the control isn't showed until i release the key)
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Aug 17, 2010
We have a issue with laptops for the current client in which IE continually shows prompts to users about working offline. The laptops are on a flaky wireless connection (Personally I would much rather fix this but they would much rather just fix this issue, apparently this works better money wise. I have my doubts).
Anyway the issue I'm facing is removing this box from opening at all.. Now there are two ways I can think of doing this. A possible Hook if it is available to catch it before it comes out and stop it. Or the less nice way is to when the box comes up to automatically hit the "try again" option using a sendkeys push.
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Jan 9, 2008
I'm back, and now with a great problem...I need to put a TrackBar in my application, in a Panel with an ImageBackGround... but the TrackBar doesn't work with Transparent Background...Now I want to build my own TrackBar Control, but support the Transparent Background...I read in some page that I need to use CustomDraw... to customize te aparience of my TrackBar... but I can't undertand how..
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Dec 27, 2008
I'm trying to create a simple transparent PANEL control. I want to create a custom control based on the existing Panel Control with a property added called "transparent" which can be set to true or false. If it's set to true it's transparent(not invisible). So if I place it over some controls in a form say a button or text box... they are visible but disabled.
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Oct 31, 2011
I'm pretty much out of ideas here... for everything else, setting the background color to Color.Transparent or setting the TransparencyKey works fine...
I have an mp4 Video which I need to play as a "background" of my form. To do this, I'm currently using the WMP control. My problem: I can't add any controls on top of it, since they always render a background. Which looks ** on the video...
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Aug 18, 2010
I have transparent form with a panel on it also set with a transparent background so you can see rite through it
what im trying to do is when you put the mouse over the panel it displays a picture and when the mouse leaves the picture goes away..the problem is that it doesnt detect the mouse when its over the panel. if i make the form background non-transparent it detects it just fine but i need it to work when both the form and panel are transparent
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Nov 7, 2010
I am working on my game maker and I need to make it so that a picturebox with a transparent image will show the control behind it, like if the control has a image or just a color.
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Mar 19, 2012
I have code for make the usercontrol transparent:
Protected Overrides ReadOnly Property CreateParams() As CreateParams
Get
Dim cp As CreateParams = MyBase.CreateParams
cp.ExStyle = cp.ExStyle Or &H20
'WS_EX_TRANSPARENT
[Code] ......
These code shows the usercontrol transparent. But when the control moves I see that these control needs time to be transparent or drawing an image. Why so many time(maybe 2 seconds)? And why I can't use directions keys on keydown event? (The arrow keys are ignored).
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Mar 10, 2011
I'm making a software where I need to have a transparent background in my form and then 50% transparent control. I don't know how to make the control 50% transparent without getting the back color from the form as back color.
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Aug 3, 2011
I am trying to use a background image for one of my programs and I get this error when I try to make the BackColor Transparent. It allows me to use the Background image I want but I get this error when I try to change the BackColor to Transparent. A Box pops up that says "Property value is not valid.", then when I click Details, it says "Control does not support transparent background colors."
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Dec 3, 2008
I am attempting to write a simple 11ball style game. It requires images of poolballs overlapping each other. Since the balls will need some internal intelligence I was hoping to create them as usercontrols.I am having trouble gettiing the control's background to be transparent.Setting the background color to (Web) transparent only makes the background clone the form background color.
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Feb 4, 2011
I'm trying to bring a transparent user control (being used as a drawing layer) to the front, over a page that will be playing video.Me.BringToFront() didn't seem to work, and when I tried Me.SetTopLevel(true) in the load, this gave me an InvalidOperationException. Here's what I have so far, sorry for the commented lines.. lots of trial and error (I'm very new, just an intern at the moment)[code]
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May 26, 2010
I have a semi-transparent custom control in vb2005 - works fine, except I can't get it to update/refresh correctly. If I update the custom parameter _backgroundColor, the control appears to be overpainted - e.g. each attempt to update the colour of the control overpaints the existing colour - until it becomes a solid block of colour. However, forcing a refresh of the form makes the control display the correct colour. Any ideas? I don't want to have to repaint the form just to get this control to render correctly. Code for the custom control is below.
[Code]...
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