Icons instead of Button text?

[decamargo10]

Checklist

• I have searched for similar issues.
• For Python issues, I have tested with the latest development wheel.
• I have checked the release documentation and the latest documentation (for master branch).

My Question

Hello,
is there any way to add icons to the Button Widget? The documentation does not mention anything in this direction but it would help me to improve the user experience a lot.
If this is not a feature yet: are there any workarounds that some of you used (e.g. using mouse events and an ImageWidget)?

Thank you in advance!

[cansik]

Since @MartinEekGerhardsen has implemented mouse and key events for image widgets #4939 🥳, it is possible to create ImageButtons quite simply (in 0.17.0). Here a basic example on how to create one:

from typing import Callable, Optional

from open3d.cpu.pybind.visualization.gui import Widget, MouseEvent
from open3d.visualization import gui


class ImageButton(gui.ImageWidget):
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)

        self.set_on_mouse(self._handle_mouse_event)
        self._event_handler: Optional[Callable[[], None]] = None

    def set_on_clicked(self, event: Callable[[], None]):
        self._event_handler = event

    def _handle_mouse_event(self, e: MouseEvent) -> Widget.EventCallbackResult:
        if e.type == MouseEvent.BUTTON_DOWN:
            if self._event_handler is not None:
                self._event_handler()

        return Widget.EventCallbackResult.CONSUMED

And use it like this:

button = ImageButton("your-icon.png")

def on_click():
    print("clicked")

button.set_on_clicked(on_click)
return button

Of course there could be a more advanced version with multiple images (switch image on hover and so on), but at least it is possible now.

[decamargo10]

That's great, I'll check it out right away. Thank you very much for your reply!