RADIO
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RADIO buttons, like check boxes, are used for selecting choices. A dot appears when a RADIO button is turned on or selected. The difference from check boxes is that the user can only select one RADIO button at a time. When a button is selected, the other buttons in the widget are turned off, as shown to the right. One RADIO button widget may contain any number of buttons.
| RADIO | |
|---|---|
 | |
| Receives focus | Yes |
| Skinnable | Yes |
| OwnerDraw | No |
| Uses Memory Devices | No |
| Attached widgets | None |
Notification codes
The following events are sent from a RADIO widget to its parent window as part of a WM_NOTIFY_PARENT message:
| Message | Description |
|---|---|
| WM_NOTIFICATION_CLICKED | RADIO has been clicked. |
| WM_NOTIFICATION_RELEASED | RADIO has been released. |
| WM_NOTIFICATION_MOVED_OUT | RADIO has been clicked and pointer has been moved out of the RADIO widget without releasing. |
| WM_NOTIFICATION_VALUE_CHANGED | Value (selection) of the RADIO widget has changed. |
Keyboard reaction
The BUTTON widget reacts to the following keys if it has the input focus:
| Message | Description |
|---|---|
| GUI_KEY_RIGHT | Increments the selection by 1. |
| GUI_KEY_DOWN | Increments the selection by 1. |
| GUI_KEY_LEFT | Decrements the selection by 1. |
| GUI_KEY_UP | Decrements the selection by 1. |
Samples
Below are links to samples that demonstrate how to use RADIO widgets in emWin.