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Support panning and zooming using mouse scroll wheel #20317

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Support panning and zooming using mouse scroll wheel #20317

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39 changes: 39 additions & 0 deletions lib/matplotlib/backend_bases.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2688,6 +2688,42 @@ def button_press_handler(event, canvas=None, toolbar=None):
toolbar.forward()


def scroll_handler(event, canvas=None, toolbar=None):
ax = event.inaxes
if ax is None:
return

if toolbar is None:
if canvas is None:
canvas = event.canvas
toolbar = canvas.toolbar

if toolbar is None or toolbar.mode == _Mode.NONE:
return

if event.key is None: # vertical scroll
toolbar.push_current()
ymin, ymax = ax.get_ylim()
delta = 0.05 * event.step * (ymax - ymin)
ax.set_ylim(ymin + delta, ymax + delta)
ax.figure.canvas.draw_idle()
elif event.key == 'shift': # horizontal scroll
toolbar.push_current()
xmin, xmax = ax.get_xlim()
delta = 0.05 * event.step * (xmax - xmin)
ax.set_xlim(xmin + delta, xmax + delta)
ax.figure.canvas.draw_idle()
elif event.key == 'control': # zoom
toolbar.push_current()
xmin, xmax = ax.get_xlim()
delta = 0.05 * event.step * (xmax - xmin)
ax.set_xlim(xmin + delta, xmax - delta)
ymin, ymax = ax.get_ylim()
delta = 0.05 * event.step * (ymax - ymin)
ax.set_ylim(ymin + delta, ymax - delta)
ax.figure.canvas.draw_idle()


class NonGuiException(Exception):
"""Raised when trying show a figure in a non-GUI backend."""
pass
Expand Down Expand Up @@ -2760,11 +2796,14 @@ def __init__(self, canvas, num):

self.key_press_handler_id = None
self.button_press_handler_id = None
self.scroll_handler_id = None
if rcParams['toolbar'] != 'toolmanager':
self.key_press_handler_id = self.canvas.mpl_connect(
'key_press_event', key_press_handler)
self.button_press_handler_id = self.canvas.mpl_connect(
'button_press_event', button_press_handler)
self.scroll_handler_id = self.canvas.mpl_connect(
'scroll_event', scroll_handler)

self.toolmanager = (ToolManager(canvas.figure)
if mpl.rcParams['toolbar'] == 'toolmanager'
Expand Down