RadioButtons.htm

Radio Buttons allow the user to select one of several items. They are indicated via empty circles next to each label - the one selected button has a black dot inside the circle.

Usually, these are shown with a line drawn around the group.

Delphi

Delphi 5.0

There are 2 basic ways to add Radio Buttons

Place a GroupBox on the form, and then add RadioButtons to it.
- Adds lots of objects to your form
- You need to test the Checked property of each radio button to determine which is selected. Set one of the button's Checked property to True.
- Allows a separate Hint per button
- Allows separate events for each button
Place a RadioGroup on the form, and then edit the Items property to define the buttons.
- Limits the number of objects on the form
- The ItemIndex property indicates which radio button is selected, the first item is zero (0), -1 means that no options are selected. To test for the active button by name, use something similar to this.
- Allows only one Hint for the entire group of buttons
- A single event is called reguardless of which button is selected

Menus support Radio Button type functionality, but they use checkmarks and does not indicate unselected options with empty circles.

Author: Robert Clemenzi - clemenzi@cpcug.org

RadioButtons.htm

Delphi 5.0

URL: http:// cpcug.org / user / clemenzi / technical / Languages / RadioButtons.html