SCROLLBAR
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SCROLLBAR widgets are used for scrolling through list boxes or any other type of window. They may be created horizontally or vertically. A scroll bar is typically attached to an existing window.
| SCROLLBAR | |
|---|---|
 SCROLLBAR with new skin. | |
| Receives focus | Yes |
| Skinnable | Yes |
| OwnerDraw | No |
| Uses Memory Devices | No |
| Attached widgets | None |
Notification codes
The following events are sent from a SCROLLBAR widget to its parent window as part of a WM_NOTIFY_PARENT message:
| Message | Description |
|---|---|
| WM_NOTIFICATION_CLICKED | SCROLLBAR has been clicked. |
| WM_NOTIFICATION_RELEASED | SCROLLBAR has been released. |
| WM_NOTIFICATION_SCROLLBAR_ADDED | SCROLLBAR has just been added (attached) to an existing window. The window needs to be informed so that it can initialize the scroll bar. |
| WM_NOTIFICATION_VALUE_CHANGED | Value of SCROLLBAR has changed, either by moving the thumb or by pressing the arrow buttons. |
Keyboard reaction
The SCROLLBAR widget reacts to the following keys if it has the input focus:
| Message | Description |
|---|---|
| GUI_KEY_RIGHT | Increments the current value of the SCROLLBAR widget by 1. |
| GUI_KEY_DOWN | Increments the current value of the SCROLLBAR widget by 1. |
| GUI_KEY_PGDOWN | Increments the current value of the SCROLLBAR widget by a value which represents 1 page. |
| GUI_KEY_LEFT | Decrements the current value of the SCROLLBAR widget by 1. |
| GUI_KEY_UP | Decrements the current value of the SCROLLBAR widget by 1. |
| GUI_KEY_PGUP | Decrements the current value of the SCROLLBAR widget by a value which represents 1 page. |
Samples
Below are links to samples that demonstrate how to use SCROLLBAR widgets in emWin.