- #XOJO LISTBOX DOWNLOAD#
- #XOJO LISTBOX WINDOWS#
I decided to stay in the managed world by providing fake transparency to the control by overriding the BackColor property to accept it, and saving its own background color brush. It allows the control to acquire a real radio button look and feel, as you can see in the screenshot above. However, transparency is a key feature needed for this control to be useful. So, transparency requires lots of non-managed tricks. NET controls accept a transparent color as a BackColor property, but ListBox is not one of them. You can add items with the Items.Add() method and query for user selection with the SelectedIndex property. That's all! Now you can use the radio button collection as a regular ListBox. Countersense to standard ListBox, transparent BackColor property is allowed.Change the standard properties of the control, just like a ListBox.Drop a RadioListBox object into your form.Include RadioListBox.cs into your project.
To implement RadioListBox into your project, you just need to do a few steps:
It will be easier to manage selection events, also shown in the demo application. 
It will be easier to change options dynamically, as shown in the demo application. It inherits some useful features like scrolling, sorting, data binding and multi-column. It is a good alternative to a group of radio buttons because you have to maintain just one control, less memory use. 
It is clearer that options are mutually exclusive with radio buttons. Initially it appeared to be trivial, since the ListBox control's unique selection version complies with the requirements, but I have concluded that this control has some advantages: A couple of years ago, I discussed in a Visual C++ forum about a member's request to implement a custom ListBox control similar to MFC's CCheckListBox, but with radio buttons. NET version of my previous MFC article, CRadioListBox: A ListBox with Radio Buttons. #XOJO LISTBOX DOWNLOAD#
Download demo project with source - 33.92 KB. Download source file (C# control) - 1.81 KB. Don’t forget to set the FontSize to any other desired value for the cell text drawn in the rows themselves!Īs a result, you will get the perfect sized header height to fit both your pictures and text. So, in this case, you would set 32 points as the Font Size for the ListBox and then set the Font Size to 20 points for the text size drawing, probably in the HeaderContentPaint Event Handler. You can use FontSize from the attributes section in the Inspector Panel to set the Header cell height. Let’s say you want to draw some pictures that are 32px height, while you want to draw the header text in a 20 points font size. Thus, you can use any of the available Graphic methods and properties to put the content of your choice right there. You already know that the "g" Graphics context are relative to each header with the (0,0) coordinate on the upper-left corner, while the g.width and g.height values are the width and height dimensions of the header itself. HeaderContentPaint(g As Graphics, column As Integer) as Booleanĭo these look familiar to you? They should! As you can see, the Event Handler signatures are like the ones for customizing the cells drawing: CellBackgroundPaint(g As Graphics, row As Integer, column As Integer) as BooleanĬellTextPaint(g As Graphics, row As Integer, column As Integer, x as Integer, y as Integer) as Boolean In addition, now it is really easy to add any picture, background color and text combination you want to your headers too and the way to do that is adding these two Event Handlers to the ListBox instance: HeaderBackgroundPaint(g As Graphics, column As Integer) as Boolean #XOJO LISTBOX WINDOWS#
Even better, you only need to implement a couple of events to make it happen!Įven if you don’t need to customize your ListBox headers right now, you are already benefitting from its related improvements in 2020r1! The header’s height will adjust on macOS to fit the text size to the font size of your choice (as it was doing already in previous releases both on Windows and Linux). I’m sure this new feature will make your ListBox shine thanks to the work of Xojo Engineer William Yu. Sure, Xojo 2020r1 introduces some long awaited and much requested features but it’s also got a lot of feature gems it in it like the ability to customize the ListBox headers!
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