diff options
Diffstat (limited to 'Lib/idlelib/tree.py')
| -rw-r--r-- | Lib/idlelib/tree.py | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/Lib/idlelib/tree.py b/Lib/idlelib/tree.py index 21426cb..6229be4 100644 --- a/Lib/idlelib/tree.py +++ b/Lib/idlelib/tree.py @@ -56,6 +56,30 @@ def listicons(icondir=ICONDIR): column = 0 root.images = images +def wheel_event(event, widget=None): + """Handle scrollwheel event. + + For wheel up, event.delta = 120*n on Windows, -1*n on darwin, + where n can be > 1 if one scrolls fast. Flicking the wheel + generates up to maybe 20 events with n up to 10 or more 1. + Macs use wheel down (delta = 1*n) to scroll up, so positive + delta means to scroll up on both systems. + + X-11 sends Control-Button-4,5 events instead. + + The widget parameter is needed so browser label bindings can pass + the underlying canvas. + + This function depends on widget.yview to not be overridden by + a subclass. + """ + up = {EventType.MouseWheel: event.delta > 0, + EventType.ButtonPress: event.num == 4} + lines = -5 if up[event.type] else 5 + widget = event.widget if widget is None else widget + widget.yview(SCROLL, lines, 'units') + return 'break' + class TreeNode: @@ -260,6 +284,9 @@ class TreeNode: anchor="nw", window=self.label) self.label.bind("<1>", self.select_or_edit) self.label.bind("<Double-1>", self.flip) + self.label.bind("<MouseWheel>", lambda e: wheel_event(e, self.canvas)) + self.label.bind("<Button-4>", lambda e: wheel_event(e, self.canvas)) + self.label.bind("<Button-5>", lambda e: wheel_event(e, self.canvas)) self.text_id = id def select_or_edit(self, event=None): @@ -410,6 +437,7 @@ class FileTreeItem(TreeItem): # A canvas widget with scroll bars and some useful bindings class ScrolledCanvas: + def __init__(self, master, **opts): if 'yscrollincrement' not in opts: opts['yscrollincrement'] = 17 @@ -431,6 +459,9 @@ class ScrolledCanvas: self.canvas.bind("<Key-Next>", self.page_down) self.canvas.bind("<Key-Up>", self.unit_up) self.canvas.bind("<Key-Down>", self.unit_down) + self.canvas.bind("<MouseWheel>", wheel_event) + self.canvas.bind("<Button-4>", wheel_event) + self.canvas.bind("<Button-5>", wheel_event) #if isinstance(master, Toplevel) or isinstance(master, Tk): self.canvas.bind("<Alt-Key-2>", self.zoom_height) self.canvas.focus_set() |