[PATCH v3 10/13] python/aqmp-tui: Add scrolling to history box

[G S Niteesh Babu]

Adds scroll support to history box. The list can now be scrolled
using arrow keys, page up/down and the mouse.

The current implementation requires the widget to be in focus
to enable scrolling. Therefore the user has to click on the widget
before scrolling.

Signed-off-by: G S Niteesh Babu <niteesh.gs@gmail.com>
---
 python/qemu/aqmp/aqmp_tui.py | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/python/qemu/aqmp/aqmp_tui.py b/python/qemu/aqmp/aqmp_tui.py
index ef91883fa5..fb828b1a27 100644
--- a/python/qemu/aqmp/aqmp_tui.py
+++ b/python/qemu/aqmp/aqmp_tui.py
@@ -351,6 +351,19 @@ def add_to_history(self,
         if self.history:
             self.history.set_focus(len(self.history) - 1)
 
+    def mouse_event(self, size: Tuple[int, int], _event: str, button: float,
+                    _x: int, _y: int, focus: bool) -> None:
+        # Scroll only on focus. Therefore it is required to
+        # click on the widget to enable scrolling.
+        if not focus:
+            return
+        # button == 4 represents scroll up event
+        if button == 4.0:
+            super().keypress(size, 'up')
+        # button == 5 represents scroll down event
+        elif button == 5.0:
+            super().keypress(size, 'down')
+
 
 class HistoryWindow(urwid.Frame):
     """
-- 
2.17.1