c++firemonkeyc++builder-xe8

Firemonkey: Add child control to TListViewItem at run time

I am attempting to add a TEdit control to a TListView control during run time. I want to parent the TEdit control to the selected TListViewItem belonging to my TListView, however, I cannot find a way to do this.

Originally, I tried this:

TEdit * MyEdit = new TEdit( this );
MyEdit->Parent = MyListView->Selected;

However, this gives me the following error:

[bcc32 Error] E2034 Cannot convert 'TListViewItem *' to 'TFmxObject *'

On a whim, I attempted to typecast the selected item on my list view as a TFmxObject like so:

MyEdit->Parent = (TFmxObject *)MyListView->Selected;

While this compiled, this caused an access violation at run time.

I have searched through a lot of documentation and forum posts and cannot find very much information about dynamically adding a control to a list view item in code. I have seen solutions which propose using the style editor, but I want to avoid that if at all possible.

How can I set the parent of a control to an item in my TListView? Is there a better / more proper way to add controls to a TListViewItem during runtime?

Solution

  • According to Embarcadero documentation, TListViewItem is not a TFmxObject descendant and thus it can not be set as a Parent to the desired TEdit instance. It does not have Children property as well. Nor do the TextObject, DetailObject etc. (the TListItemObject descendants contained in TListViewItem) ascend from TFmxObject. It seems you have the following ways out.

    1. Write and register another ListViewItem class and implement it inside your ListViews or
    2. See this and this SO links. Probably, they might be useful.
    3. Consider using TListBox instead. TListBoxItems can parent other controls.