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Transparency for windows forms textbox
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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
Related
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
Is there any auto re-size property of form in vb6 with respect to the control size ?
like this.Auto Size = false in c# ?
Your question can be interpreted in more than one way.
If you are asking if controls can be set to automatically resize in VB6 forms then the answer is no, resizing controls when the form resizes has to be done in code. It's not that hard if you're careful about how you design the form.
If you are asking if there is a way to set whether or not a form can be resized then you can use the BorderStyle property of the form, there are various options depending on what you want.
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 use windows form with GlassForm(using Microsoft.WindowsAPICodePack.Shell;). my problem when I change form to GlassForm my textbox texts doesnt
Place a panel on the form set the dock style to fill, set the panel's BackColor to color X and then set the form's TransparencyKey to the same color X.
Yes, that's how it works. With the Aero Glass effect applied, anything drawn in the color black will be rendered as transparent. That includes text in a textbox control. This general theme has been the subject of many other questions here. When well-written, they gather lots of upvotes, but few answers.
There just aren't a lot of good solutions here. All of them that I've come across qualify as both "ugly" and "hackish". Owner-drawing is a reasonable approach when you're using something like a label control, but I wouldn't recommend trying to draw your own textbox—it's just too hard to get right. Someone tried to do that here; like I said, the result is both ugly and hackish. I wasn't satisfied with it for my own use, but it may work for you, depending on how high your standards are.
The goal with owner-drawing, of course, is either to do all of the drawing using GDI+ (which natively supports transparency) instead of GDI (which all of the built-in controls use by default), or calling functions like DrawThemeTextEx, which is specifically designed for rendering text with a shadow that is [somewhat] readable over glass.
As well, the usual tricks like enabling compatible text rendering (which causes the built-in controls to draw using GDI+ routines, as they did in the early versions of .NET) don't work for a textbox.
Honestly, your best bet is to place the textbox over a region of your form that is not rendered as glass. Use the DwmEnableBlurBehindWindow function to selectively enable the glass effect behind certain areas of your form, rather than the entire thing. I provide a complete, ready-to-use .NET implementation in my answer here.
Check this sample out:
http://www.danielmoth.com/Blog/Glass-In-C-An-Alternative-Approach.aspx
I was not studying it any further but putting a TextBox or Button or other components over this Aero glass area worked - the rendered component didn't have the transparency problem. The labels aren't perfect but these can be easily drawn with GDI+
The direct link to the sample project is here: http://www.danielmoth.com/Blog/MothGlass.zip
It looks like he puts a panel behind the control and setting the TransparencyKey for the panel.
In C# WinForms I'd like to make a UserControl that mimics the look of a ToolWindow -- sizable, with room for a caption and a close button at the top right. This seems possible through overriding CreateParams(), using the relevant constants from WinUser.h, and adding custom handlers for the appropriate mouse events, but it seems like a lot of trouble for something that simple. Before I go to it, is there an easier way?
Really rather the easiest way is to just use a Form with FormBorderStyle = SizeableToolWindow. That's what it was made for. Display it with the Show(owner) overload so it is always on top of your main window. If you want to salvage the UserControl then just Dock = Fill in the form. Albeit that exposing its properties get harder to do cleanly.
Check out Weifenluo's DockPanel Suite for a windowing model that resembles Visual Studio's.
ToolWindow is a window, UserControl is a control that sits INSIDE a window (like a text box, button, etc.). If you want to have a UserControl that is sizable and has a caption and a close button, I think you'll have to create a caption bar and close button and size grips as parts of the control itself.
You'd need to remove the control from its parent on "close", and resize the control in its parent on "resizing" with size grips.