I have an application in which I have used radio button over an image so it seems very bad with white background in radio button.
So is there a way I can remove that white background ?
Only setting the BackColor to Color.Transparent is not enough to get rid of the little border that is around the RadioButton.
What you will need to also do is call the following code for each radio button to ensure that the background does actually go transparent
rbnTest.BackColor = Color.Transparent;
Point pos = this.PointToScreen(rbnTest.Location);
rbnTest.Parent = pibPicture;
rbnTest.Location = pibPicture.PointToClient(pos);
Source (Not a true duplicate, but similar, hence not flaggin as duplicate)
I would recommend refactoring that code into a reusable method so that you do not scatter the code all over your project.
Locate the constructor for your control class. The constructor appears in the control's code file. In C#, the constructor is the method with the same name as the control and with no return value.
Call the SetStyle method of your form in the constructor.
SetStyle(ControlStyles.SupportsTransparentBackColor, true);
add the following line. This will set your control's BackColor to Transparent.
this.BackColor = Color.Transparent;
Note
Windows Forms controls do not support true transparency. The background of a transparent Windows Forms control is painted by its parent.
You can use the RadioButton.BackgroundImage or the RadioButton.BackColor property. Choose the one that suits you best
Related
I use User Control in panel. When I use white as BackColor of something it becomes transparent automatically even all kind of operation can be done over my app.
What if you try to set BackColor to 'Grey'? does it work?
And could you add screenshoot from User Control properties?
I was wondering if I could draw the background of a tabpage in C# transparent like so I can see behind the window itself. I though it would give a cool effect but I don't know if or how I can do it.
You can set the Appearance property of TabControl to Buttons Instead of using BackColor property. That would bring transparent tab page look and cool effect.
VB & C# syntax
TabPage1.BackColor = Color.Transparent
this will show the tabpage1 color as the form color.
Anyway, I'm having a little difficulty with tab control. When I drag a new tab control onto a form, it appears white, rather than the grey (system colour) I was expecting.
When I look at the properties, its colour is set to web-transparent. Ok, so it should be transparent then (it isn't letting anything behind it show through). Setting the tab control back colour manually back to the system grey kind of works, but the tabs at the top still show as white. I'm assuming I could somehow change their colour as well, but I'm quickly getting into the realms of changing so many values from default, I'm clearly missing something type territory. I've googled every varient of "transparent tab control draws white" as I can, and although I found something to do with windows profiles, this seemed mostly confined to access 2003 using the vb you got access to in access.
I'm looking for any explanation as to:
what I need to do to correctly use transparency with tab controls
what I'm mis-understanding as the purpose of transparency in tab controls
how to easily change all the colours of the appropriate parts of the tab control to not be transparent.
I'm looking at windows forms for an MCTS, so please don't give a "you should use X instead" type answer.
No, getting white is certainly normal. TabControl and TabPage are rendered with theme colors when visual styles are enabled. So that makes the tab page white on machines with the standard Windows theme.
Yes, the default BackColor of Transparent is very unusual. You most certainly will never get actual transparency with that, unless you count seeing the background of the TabControl as transparency. The logic is pretty convoluted, rather than trying to explain it I'll just paste the MSDN explanation:
The default value of the BackColor property is the value of the Control.DefaultBackColor property unless the UseVisualStyleBackColor and Application.RenderWithVisualStyles property values are both true and the Appearance property of the parent TabControl has a value of Normal, in which case the default value of the BackColor property is Transparent. Child controls that you place on the TabPage inherit the BackColor value by default, so this behavior causes the background of the child controls to render with the current visual style.
Changing the value of the BackColor property automatically sets the UseVisualStyleBackColor property to false. If you want the TabPage background to render using visual styles but you want the child controls to inherit a BackColor value that you specify, set the UseVisualStyleBackColor property after you set the BackColor property.
How I make a background transparent on my form? Is it possible in C#?
Thanks in advance!
You can set the BackColor of your form to an uncommon color (say Color.Magenta) then set the form's TransparencyKey property to the same color. Then, set the FormBorderStyle to None.
Of course, that's just the quick and easy solution. The edges of controls are ugly, you have to keep changing the background color of new controls you add (if they're Buttons or something like that) and a whole host of other problems.
It really depends what you want to achieve. What is it? If you want to make a widget sort of thing, there are much better ways. If you need rounded corners or a custom background, there are much better ways. So please provide some more information if TransparencyKey isn't quite what you had in mind.
Put the following in the constructor of the form:
public Form1()
{
this.TransparencyKey = Color.Turquoise;
this.BackColor = Color.Turquoise;
}
Note: This method prevents you from clicking through the form.
Update:
How to: Give Your Control a Transparent Background
Deprecated:
How to: Create Transparent Windows Forms:
Note: As transparent forms are only supported in Windows 2000 or
later, Windows Forms will be
completely opaque when run on older
operating systems, such as Windows 98,
regardless of the value set for the
Opacity property.
A simple solution to get a transparent background in a winform is to overwrite the OnPaintBackground method like this:
protected override void OnPaintBackground(PaintEventArgs e)
{
//empty implementation
}
(Notice that the base.OnpaintBackground(e) is removed from the function)
I've created a simple user control which is manually created with something like
MyUserControl ctrl = new MyUserControl();
The control have been designed to have BackColor = Color.Transparent and that works fine, until I set the Parent of the control to a form at which time it turns into the color of the form.
Might sound like its transparent but what it does is hide all the controls that exist on the form as well. I'm not 100% sure its the control that gets a solid background or something else thats happening when i hook it up, which prevents other controls from showing.
Basically if you do this
Create a form
Drop a button on it
In the click handler for the button you do the following
Example
MyUserControl ctrl = new MyUserControl();
ctrl.Parent = this;
ctrl.BackColor = Color.Transparent;
ctrl.Size = this.Parent.ClientRectangle.Size;
ctrl.Location = this.Parent.ClientRectangle.Location;
ctrl.BringToFront();
ctrl.Show();
Basically I want the usercontrol to overlay the entire form, while showing the underlaying controls on the form (hence the transparent background). I do not want to add it to the forms control collection because it doesn't really belong to the form, its just being shown ontop of everything else
I tried doing the same, but without setting the parent, but then the control didnt show at all.
Thanks!
EDIT: If I override the OnPaintBackground method in the usercontrol and prevent the background from being painted then it works, however that messes up with the transparent parts of a PNG image im painting in the control using DrawImage, which makes sense.
Windows Forms doesn't really support transparent controls.
You can work around this limitation by overriding the CreateParams property of the control and setting a custom style (look it up on google).
Further you have to override the painting of your control so that not only your control but also the parent control is redrawn. The reason is that the background must be painted before your control paints itself.
Finally you should override the OnPaintBackground method, as you have done, to make sure no background is painted.
Quite clumsy, and not perfect, but it should work.