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)
Related
Is it possible to change the background color of a VscrollBar? The best approach I have consulted is http://www.codeproject.com/Articles/624997/Enhanced-Scrollbar or http://www.codeproject.com/Articles/41869/Custom-Drawn-Scrollbar, but no exists BackColor property, and BackgroundImage not works.
I tried the simplest thing like:
public class ScrollBarEx : VScrollBar
{
protected override void OnPaint(PaintEventArgs e)
{
base.BackColor = Color.Red;
base.Invalidate();
}
}
It does not work. Any suggestions?
I built my own custom ScrollBar control based on http://www.codeproject.com/Articles/41869/Custom-Drawn-Scrollbar.
My custom ScrollBar comes with ready-to-use themes (VS 2019 Dark and VS 2019 Light). You can change the control background color by modifying the field _backColor or you can expose this private field with a property to allow you to change the background color from the code.
I have modified the original control to get rid of the 3D colors and replaced them with flat colors
Complete Flat ScrollBar control code in VB.NET
https://gist.github.com/ahmedosama007/c1b0cd327d395a5698c1e17e96d0f8f9
Not much new info, but: you have to play around with Paint event and do custom drawing of your scrollbar, here is another link with this solution (custom drawing through Paint event) http://www.codeproject.com/Articles/14801/How-to-skin-scrollbars-for-Panels-in-C
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
i was wondering if there is anyway to Re-size a Forms background Image according to how high and how wide the form is. A property or a code maybe?
You could set
BackgroundImageLayout = ImageLayout.Stretch;
in either the Code or the Forms editor.
This question already has answers here:
Transparency for windows forms textbox
(8 answers)
Closed 8 years ago.
I want to do textBox a Transparent Background c# .net
Visual Studio is making a mistake if you define Properties
Put this in the constructor:
SetStyle(ControlStyles.SupportsTransparentBackColor, true);
The class need to enable the transparent style. (For some reason it isn't supported by default).
public class MyControl : System.Windows.Forms.UserControl
{
public MyControl ()
{
// Create visual controls
InitializeComponent();
SetStyle(ControlStyles.SupportsTransparentBackColor, true);
}
}
Or if it's not a custom control:
mycontrolObject.SetStyle(ControlStyles.SupportsTransparentBackColor, true);
More about Control.SetStyle Method
Other Control Styles
I've found a workaround for this problem, which I have on my own.
Most of what I've read over here is true. And the approaches "à la" AlphaBlendTextBox are way too complex or too time-consuming for some environments, already heavily charged.
Assume you have a given background color and a given picture or whatever you want to see through the RichTextBox control. This is what I've done (summarized):
on the main form, you place the picture, text, buttons or whatever as projected, with the proper background color and / or picture
create a new form and position it wherever appropriate
set this new form TransparencyKey to SystemColors.InactiveBorder
take care of this form border properties (FormBorderStyle to FormBorderStyle.None; ControlBox,MinimizeBox, MaximizeBox and ShowIcon to false, TopMost to true, StartPosition to FormStartPosition.Manual, SizeGripStyle to SizeGripStyle.Hide), so there's no visible form structures
create a RichTextBox with the same size of the form and located on its upper, left corner
set this box BackColor to SystemColors.InactiveBorder (remember the TransparencyKey?)
and its BorderStyle to None as well
take care of textbox contents: color(s), font(s) and strings
synchronize this form visibility with whatever you need to and... voilà! You can see your application background through whatever you write and edit on the text box!
I can't pretend this approach fits everybody, but it is way simpler than others I've seen and, as long as I can keep it that way, I do prefer the simpler solutions.
Of course, when you close the main form, you must take care of the child form, but this is pretty basic for you, isn't it?
Enjoy!
This is not an easy task. .Net TextBox control is a wrapper around Win32 Edit control, so you will need to do sub-classing to achieve background transparency.
Take a look at this sample: AlphaBlendTextBox - A transparent/translucent textbox for .NET
Is there any way to make a panel transparent or semi transparent? I haven't found any appropriate property to set transparency for a panel.
I was also trying to make a WPF control with grid (grid background and control background was set to transparent) and place it on normal windows form, but when I put this control on normal Windows Form(not WPF) I don't get the proper transparency.
If your display is pretty much static, you can do this to achieve semi-transparency (Source):
class SeeThroughPanel : Panel
{
public SeeThroughPanel()
{
}
protected override CreateParams CreateParams {
get {
var cp = base.CreateParams;
cp.ExStyle |= 0x00000020;
return cp;
}
}
protected override void OnPaint(PaintEventArgs e)
{
//base.OnPaint(e);
e.Graphics.FillRectangle(new SolidBrush(Color.FromArgb(50, 0, 0, 0)), this.ClientRectangle);
}
}
But, this approach is not without problems if you need dynamic rendering on your semi-transparent control. See this question which I have posted. Hope it gets answered someday.
Unfortunately, transparency is not natively or well supported in WinForms and is difficult to implement yourself.
If you want a transparent panel that allows you to "see through" the form, take a look at this article, which tells you to set both the Panel's TransparencyKey and BackColor to something like Fuscia. With text/other stuff in the panel this effect may not look so good.
If you want a transparent or translucent panel that shows the form below take a look at this SO question.
I would use WPF all the way, if you are able to use it in a form now.
I'm not sure about making the panel semi-transparent, but I know you can use the TransparencyKey property of the form to create completely transparent sections.
For example, set the form's TransparencyKey property to Fuchsia, then set the panel's BackColor to Fuchsia, and it will create a transparent area on the form.
Edit:
Agree with #Callum Rogers about going with WPF. Text directly on the panel shows fringing (see the label in the screenshot). However, if you need to add this quickly to an existing Win Forms app and don't need to show text directly on the panel, it could work for you.