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How do I add a button control in the combobox item?

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How do I add a button control in the combobox item?

Posted 23-Nov-14 20:16pm

Comments

DamithSL 24-Nov-14 2:25am

http://stackoverflow.com/questions/10171645/combobox-like-a-button[^]

Sergey Alexandrovich Kryukov 24-Nov-14 2:29am

I'm not sure that this is what OP wants (unless the question is incorrectly formulated). "Add a button" suggests that a button should become one of the list elements (otherwise it wouldn't be "adding"). If this is so, please see my question.
—SA

Javafree 24-Nov-14 2:39am

thanks！

Sergey Alexandrovich Kryukov 24-Nov-14 3:17am

You are very welcome.
Good luck, call again.
—SA

Member 11364646 24-Feb-15 7:41am

yes this the question please provide soln.

Sergey Alexandrovich Kryukov 24-Feb-15 8:54am

Didn't you misplace this comment or something? I provided a solution in 2014, it was ever accepted formally.
—SA

BillWoodruff 24-Nov-14 2:37am

We need to know more to assist you. Is this WinForms ?

In WinForms the ComboBox Items function, in a way, like a Button: they generate a Click Event of the ComboBox: if you could have a Button in a ComboBox Item, what would you want it to do if clicked ?

Javafree 24-Nov-14 2:57am

yes,this is WinForm.I want add a picture in ComboBox each item,click the picture to delete this item.

Sergey Alexandrovich Kryukov 24-Nov-14 3:19am

In v.2.0, ComboBox is offered by FCL only for Forms. Of course, there are 3rd-party UI libraries...
—SA

Member 11364646 24-Feb-15 8:16am

yes this is winform .i am using c# technology in this . i want button to come in drop down list . and click on this button to perfrm some particular function . so please provide with code or give some hint to so.

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Solution 1

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As you are asking about v.2.0. "ComboBox" probably means System.Windows.Forms.ComboBox. No, this control is not designed to hold other controls. The items of its list box part can be of any type, but presented in UI is just the string obtained as ToString. Therefore, even if you add button instance to the combo box, it won't be shown as a button, so you cannot do what you want.

I don't think what you want to achieve is a good design idea. However, you can achieve such look and behavior if you create a custom control from scratch. One of the possibility is this: your "list box-like" part of your control could be derived from ScrollableControl; this way, you could easier implement the scrolling of the elements of the "list box".

—SA

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Posted 23-Nov-14 20:26pm

Sergey Alexandrovich Kryukov

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Solution 2

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Now that I know that what you want is a graphic element inside a ComboBox Item: you can sub-class the ComboBox and use custom painting (GDI+) to draw an image as illustrated here: [^]

Hit detection on the graphic element alone would require some work.

Unless you are quite advanced with WinForms and creating sub-classed Controls from standard MS provided Controls, I wouldn't recommend this.

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Posted 23-Nov-14 21:02pm

Comments

Sergey Alexandrovich Kryukov 24-Nov-14 3:16am

There are some big problems with this approach. In fact, if you look at the many customized ComboBox-line controls in different libraries, you will see the same approach: people give up sticking features in existing combo box and instead compose a new control out of a text box and a scrolling listbox-like area. That's why I suggested what I suggested in Solution 1.

What are the problems? First of all, it's not easy to create all Button behavior in a custom draw. Remember that you need to provide visual feedback on mouse hover, on depressing and releasing the button (which also happens with the mouse capture). How? You would need to invalidate the whole combo box on all these events. There are many other problems. That's why people usually don't sub-class this particular control (based on Windows API). At the same time, composing of a similar control out of other controls is quite feasible and is often used.

—SA

BillWoodruff 24-Nov-14 7:52am

If you really read my response it would clear to you that I do not recommend sub-classing the ComboBox.

But, if you wish to exercise your fingers sermonizing to yourself, be my guest :)

Sergey Alexandrovich Kryukov 24-Nov-14 10:39am

How should I understand this: "you can sub-class the ComboBox"? As this is the only approach you describe, your "wouldn't recommend this" (only based on insufficient experience, not anything objective) doesn't change anything. It made a legitimate answer, but still leaving a room for my comment. After all, I added my comment to explain what is the right choice. Can you see my point?
—SA

Javafree 25-Nov-14 1:29am

ok,thanks.

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