About Comboboxes.

[zikar]

Hi,

I am trying to use a combobox in a Borland CBuilder project.

How can I make this combobox readonly ?

The user should be able to choose items from the combobox.
He or she should not be able to write in to it.

Thanks for any useful tip.

Michel

 

[butthead]

void __fastcall TForm1::ComboBox1KeyPress(TObject *Sender, char &Key)
{
Key = NULL;
}

tomcruz.net

 

[Totte]

Another way is (as i recall) to set it's Style (in Properties) to "csDropDownList".......
It COULD be one of the other Styles, try another if i'm remembering wrong, one of them does the job!

Totte

 

[zikar]

Hi,

Now I need to control the input in a Combo Box.

Say the character 'X' should be present one time and only once.

That means I do not want the user to be able to input a second 'X' character. And I do not want him (or her) to delete this 'X' character.

The logic is simple but I just need to know which character the user is trying to add or delete. In other words I want to know the cursor position in the combo (or edit) box.
How do I know this postition ?

Michel

 

[Totte]

Well well.....what do You know....tried a little and it turns out that ComboBox->SelStart actually corrospond to the location where You put in the keypress when you input manually. So catch the keypress event and do the woodoo You do so well using the SelStart.

Totte