Gtk：如何检测EventBox上的鼠标位置？

Question

我一直在尝试用Python编写简单的CAD应用程序。我在修补pyglet，得到了一些结果：，但我决定切换回Gtk，我撞到了墙：

我无法获取EventBox上的鼠标指针位置（对于pyglet，它是图片中窗口应用程序左下角的标签）。为它设计了什么信号？或者我应该用另一种方法？你知道吗

我将感谢任何信息或资源。提前谢谢。你知道吗

Answer 1

在stovfl的帮助下，解决了这个问题。 应用程序 由绘图区域、框架、事件框和标签组成，用于显示鼠标指针坐标。绘图区域被添加到长方体，长方体被添加到框架，框架被添加到栅格。你知道吗

from gi.repository import Gtk
from gi.repository import Gdk
# (...)
    box = Gtk.EventBox()
    box.add_events(Gdk.EventMask.POINTER_MOTION_MASK)  # 1
    box.connect("button-press-event", self.on_click)
    box.connect("motion-notify-event", self.on_mouse_move)  # 2
    self.canvas = Gtk.DrawingArea()
    self.canvas.connect("draw", self.on_draw)
    self.canvas.set_size_request(800, 600)
    box.add(self.canvas)
    grid = Gtk.Grid()
    frame = Gtk.Frame()
    frame.set_label("KHAD")
    frame.add(box)
    grid.attach(frame, 0, 1, 1, 1)
    self.add(grid)
    # (...)
    self.locationLabel = Gtk.Label("X,Y")
    self.locationLabel.set_alignment(0, 0)
    grid.attach(self.locationLabel, 0, 2, 1, 1)

解决方案是：

1. 将POINTER_MOTION_MASK添加到事件框：box.add_events(Gdk.EventMask.POINTER_MOTION_MASK)。你知道吗
2. 用一个方法连接方框的motion-notify-event，该方法读取并更新一个标签（在左下角；它与self.locationLabel.set_alignment(0, 0)对齐）。你知道吗

Answer 2

Question: How to detect the mouse position over EventBox?

• how-to-capture-event-on-event-box-to-detect-mouse-movement-in-gtk
• Gtk.EventBox

  The Gtk.EventBox widget is a subclass of Gtk.Bin which also has its own window. It is useful since it allows you to catch events for widgets which do not have their own window.

• Gtk.Widget.add_events(events)

  Adds the events in the bitfield events to the event mask for self.

• Gdk.EventMask

  A set of bit-flags to indicate which events a window is to receive.

  • GDK_MOTION_NOTIFY the pointer (usually a mouse) has moved

Gtk.EventBox应该有标志，而不是窗口！你知道吗

box = Gtk.EventBox()
box.connect("motion-notify-event", self.on_mouse_move)
box.add_events(Gdk.EventMask.POINTER_MOTION_MASK)