| KXL_EVENT_KEY_PRESS | When a key is press. |
| KXL_EVENT_KEY_RELEASE | When a key is release. |
| KXL_EVENT_BUTTON_PRESS | When a mouse button is press. |
| KXL_EVENT_BUTTON_RELEASE | When a mouse button is release. |
| KXL_EVENT_BUTTON_MOTION | When a moves pressing mouse button. |
| KXL_EVENT_EXPOSE | When a demand of re-drawing. |