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Trigger events via standard callbacks in widget testing. #29993

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anntzer
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@anntzer anntzer commented May 1, 2025

Sending actual events through the whole event processing pipeline is a more complete test, reveals a few minor issues (see changes below), and avoids being linked to the rather nonstandard widget method names ("press" or "_click"?).

The coordinates in the "move first vertex after completing the polygon" subtest of test_polygon_selector(draw_bounding_box=True) were altered because the original coordinates would actually not work in a real case, as the mouse-drag would actually also trigger the polygon-rescaling behavior.

The coordinates in test_rectangle_{drag,resize} were altered because for the original coordinates, the click_and_drag would actually be ignore()d due to starting (just) outside of the axes.

Closes #22720.

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PR checklist

Sending actual events through the whole event processing pipeline is a
more complete test, reveals a few minor issues (see changes below), and
avoids being linked to the rather nonstandard widget method names
("press" or "_click"?).

The coordinates in the "move first vertex after completing the polygon"
subtest of test_polygon_selector(draw_bounding_box=True) were altered
because the original coordinates would actually not work in a real case,
as the mouse-drag would actually also trigger the polygon-rescaling
behavior.

The coordinates in test_rectangle_{drag,resize} were altered because for
the original coordinates, the click_and_drag would actually be ignore()d
due to starting (just) outside of the axes.
@@ -137,7 +135,7 @@ def test_rectangle_drag(ax, drag_from_anywhere, new_center):
tool = widgets.RectangleSelector(ax, interactive=True,
drag_from_anywhere=drag_from_anywhere)
# Create rectangle
click_and_drag(tool, start=(0, 10), end=(100, 120))
click_and_drag(tool, start=(10, 10), end=(90, 120))
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The positions in the last part of this test are also outside both before and after rectangles, so just checking if those are still valid, or are they actually outside the Axes just as these were (and thus not checking what was intended)?

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The axes default to ranging from 0 to 200, so the last part's rectangles are within the axes.

@dstansby
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dstansby commented May 5, 2025

👍 to removing do_event() from the public API, but it is a useful helper for testing. Why not keep it around (rename to _do_event()), and change the function definition to MouseEvent._from_ax_coords(...)._process()? That way it would avoid having to remember to have to call _from_ax_coords() and _process() across the tests.

@anntzer
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anntzer commented May 5, 2025

The problem is that right now do_event takes a (not-standardized) widget method name as parameter. I guess, sure, we could completely change the signature and have a private do_event("button_press_event", ax, xycoords, button) helper method, but if we really think that MouseEvent._from_ax_coords(...)._process() is not ergonomic enough, perhaps that rather points to the fact that that API should be reworked anyways (which is not something I really want to go into right now)?

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[MNT]: Generalize widget mouse testing
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