Gtk：如何检测 EventBox 上的鼠标位置？

Question

我一直在尝试在 Python 中编写简单的 CAD 应用程序。我正在修补 pyglet，得到了一些结果：，但我决定切换回 Gtk，结果碰壁了：

我无法获取 EventBox 上的鼠标指针位置（对于 pyglet，它是图片中 window 应用程序左下角的标签）。为它设计什么信号？或者我应该使用其他方法？

我将不胜感激任何信息或资源。提前致谢。

Answer 1

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

应该是Gtk.EventBox拿到了flag，不是window！

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

Answer 2

在 stovfl 的帮助下，解决方案得以实现。应用程序由绘图区、框架、事件框和标签组成，用于显示鼠标指针坐标。绘图区添加到框，框添加到框架，框架添加到网格。

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：

将POINTER_MOTION_MASK添加到事件框：box.add_events(Gdk.EventMask.POINTER_MOTION_MASK)。
用方法连接框的 motion-notify-event，该方法读取并更新标签（左下角；它与 self.locationLabel.set_alignment(0, 0) 对齐）。

Gtk：如何检测 EventBox 上的鼠标位置？

Gtk: How to detect the mouse position over EventBox?

python

gtk