Gtk指针穿透窗体实现

查看了一下Peek源码的实现，终于实现了指针穿透的效果
主要使用Gdk.Window.input_shape_combine_region 实现。

Like Gdk.Window.shape_combine_region(), but the shape applies only to event handling. Mouse events which happen while the pointer position corresponds to an unset bit in the mask will be passed on the window below self.

An input shape is typically used with RGBA windows. The alpha channel of the window defines which pixels are invisible and allows for nicely antialiased borders, and the input shape controls where the window is “clickable”.

On the X11 platform, this requires version 1.1 of the shape extension.

On the Win32 platform, this functionality is not present and the function does nothing.

Code

import sys
import cairo
import gi

gi.require_version('Gtk', '3.0')
from gi.repository import Gtk, Gdk


class AppWindow(Gtk.ApplicationWindow):

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.set_size_request(500, 500)

        label = Gtk.Label(label="指针穿透窗体")
        self.add(label)
        self.set_keep_above(True)
        self.set_app_paintable(True)
        # self.set_decorated(False)
        screen: Gdk.Screen = self.get_screen()
        visual = screen.get_rgba_visual()
        self.set_visual(visual)

    def do_map_event(self, *args):
        orig_x = self.get_allocated_width()
        orig_y = self.get_allocated_height()

        rect = cairo.RectangleInt(x=orig_x, y=orig_y, width=self.get_allocated_width(),
                                  height=self.get_allocated_height())
        region = cairo.Region(rect)
        self.input_shape_combine_region(region)
        # self.shape_combine_region(region)


class Application(Gtk.Application):

    def __init__(self, *args, **kwargs):
        super().__init__(*args, application_id="org.example.myapp",
                         **kwargs)
        self.window = None

    def do_activate(self):
        if not self.window:
            self.window = AppWindow(application=self,
                                    title="指针穿透窗体", type=Gtk.WindowType.TOPLEVEL)
        self.window.show_all()
        self.window.present()


if __name__ == "__main__":
    app = Application()
    app.run(sys.argv)

效果

gtkzhizhenchuantou.png