Add render settings widget

[pablode]

This PR adds a widget that allows the user to interact with the Hydra render delegate settings. See it in action here:

2023-08-06.16-58-33.mp4

[manuelkoester]

This is awesome Pablo, thank you for your contribution!

I think we will probably need a vertical scroll to enable renderers with a lot of render settings. Your looks great, I'll add some comments here and there

[manuelkoester]

This is great! It would be increadible if you could address these 2 comments. Otherwise we can also merge and add some additional work on our end.

Awesome contribution ❤️

[manuelkoester]

We use these functions to act as a way of dependency injection.
This way our constructor doesn't need a ton of parameters. If one wants to us their own StageViewWidget they can overwrite it via (pseudocode):

class MyStageView(StageViewWidget):
    pass


class MyQuiltiX(QuiltiX):
    def get_stage_view_widget(self):
            return MyStageViewWidget()

[pablode]

Ah, that makes sense. I was wondering what they were for. I've reintroduced them in the latest commit.

[manuelkoester]

Here I think we would need a QScrollArea() around the QFormLayout to deal with renderers which have a lot of render settings.

[pablode]

I have implemented the suggestion as follows:

--- a/src/QuiltiX/usd_render_settings.py
+++ b/src/QuiltiX/usd_render_settings.py
@@ -1,15 +1,21 @@
 from Qt.QtCore import Qt # type: ignore
-from Qt.QtWidgets import QDoubleSpinBox, QLineEdit, QFormLayout, QWidget, QCheckBox, QSpinBox  # type: ignore
+from Qt.QtWidgets import QDoubleSpinBox, QLineEdit, QFormLayout, QWidget, QCheckBox, QSpinBox, QScrollArea  # type: ignore

 from pxr.Usdviewq.stageView import StageView, UsdImagingGL

-class RenderSettingsWidget(QWidget):
+class RenderSettingsWidget(QScrollArea):

     def __init__(self, stage_view, window_title="Render Settings"):
         super(RenderSettingsWidget, self).__init__()
         self.setAttribute(Qt.WA_StyledBackground, True)
         self.stage_view = stage_view
-        self.layout = QFormLayout(self)
+
+        innerWidget = QWidget(self)
+        self.layout = QFormLayout(innerWidget)
+        self.setWidget(innerWidget)
+        self.setWidgetResizable(True)
+        self.setHorizontalScrollBarPolicy(Qt.ScrollBarPolicy.ScrollBarAlwaysOff)
+        self.setVerticalScrollBarPolicy(Qt.ScrollBarPolicy.ScrollBarAsNeeded)

     def on_renderer_changed(self):
         self._clear_widgets()

however, I'm not quite sure about

1. the initial dock widget size
2. horizontal sizing/scroll behavior
3. styling (padding/margin) with respect to the node properties window.

Perhaps it would be best to merge and you can resolve these points internally?

[manuelkoester]

Sounds great to me!

[manuelkoester]

Thanks again Pablo, will merge this soon :)