def mousewheel_scroll(self, axis, event):
bbox = self.root_canvas.bbox(tk.ALL)
dims = (self.root_canvas.winfo_width(),
self.root_canvas.winfo_height())
if not bbox or (dims[axis] >= (bbox[2 + axis] - bbox[axis])):
return
self._pending_scroll_counts[axis] += 1
if self._scrolling:
return
self._scrolling = True
try:
axis_char = "xy"[axis]
scroll_func = getattr(self.root_canvas, axis_char + "view_scroll")
scroll_inc = (
getattr(self.app_root, "scroll_increment_" + axis_char, 20) *
self._pending_scroll_counts[axis] * get_mouse_delta(event))
self._pending_scroll_counts[axis] = 0
scroll_func(int(scroll_inc), "units")
self.root_canvas.update()
self._scrolling = False
except Exception:
self._scrolling = False
raise
def mousewheel_scroll_x(self, e):
# prevent scrolling if the root_canvas.bbox width >= canvas width
bbox = self.root_canvas.bbox(tk.ALL)
if not bbox or (self.root_canvas.winfo_width() >= bbox[2] - bbox[0]):
return
delta = getattr(self.app_root, "scroll_increment_x", 20)
self.root_canvas.xview_scroll(int(get_mouse_delta(e) * delta), "units")
def mousewheel_scroll_y(self, e):
# prevent scrolling if the root_canvas.bbox height >= canvas height
bbox = self.root_canvas.bbox(tk.ALL)
if not bbox or (self.root_canvas.winfo_height() >= bbox[3] - bbox[1]):
return
delta = getattr(self.app_root, "scroll_increment_y", 20)
self.root_canvas.yview_scroll(int(get_mouse_delta(e) * delta), "units")
def _mousewheel_scroll(self, e):
if not self.should_scroll(e) or (self.option_box_visible
or self.disabled):
return
delta = get_mouse_delta(e)
if delta < 0:
self.decrement_sel()
elif delta > 0:
self.increment_sel()
def mousewheel_scroll_y(self, e):
if self.should_scroll(e):
delta = (
getattr(self.tag_window.app_root, "scroll_increment_x", 20) *
int(widgets.get_mouse_delta(e)))
self.check_canvas.yview_scroll(delta, "units")