From 0183ac73b2783f779d25fb3d59e26dc8798b8d0a Mon Sep 17 00:00:00 2001
From: iLLiCiTiT <jakub.trllo@gmail.com>
Date: Mon, 14 Jun 2021 15:21:26 +0200
Subject: [PATCH] scrolling of environments view start when you scroll to
 bottom of widget

---
 openpype/tools/tray/pype_info_widget.py | 52 ++++++++++++++++++++++++-
 1 file changed, 50 insertions(+), 2 deletions(-)

diff --git a/openpype/tools/tray/pype_info_widget.py b/openpype/tools/tray/pype_info_widget.py
index f95a31f7c2..2965463c37 100644
--- a/openpype/tools/tray/pype_info_widget.py
+++ b/openpype/tools/tray/pype_info_widget.py
@@ -28,6 +28,8 @@ class EnvironmentsView(QtWidgets.QTreeView):
     def __init__(self, parent=None):
         super(EnvironmentsView, self).__init__(parent)
 
+        self._scroll_enabled = False
+
         model = QtGui.QStandardItemModel()
 
         env = os.environ.copy()
@@ -112,8 +114,11 @@ class EnvironmentsView(QtWidgets.QTreeView):
         else:
             return super(EnvironmentsView, self).keyPressEvent(event)
 
+    def set_scroll_enabled(self, value):
+        self._scroll_enabled = value
+
     def wheelEvent(self, event):
-        if not self.hasFocus():
+        if not self._scroll_enabled:
             event.ignore()
             return
         return super(EnvironmentsView, self).wheelEvent(event)
@@ -200,9 +205,13 @@ class CollapsibleWidget(QtWidgets.QWidget):
 
 
 class PypeInfoWidget(QtWidgets.QWidget):
+    _resized = QtCore.Signal()
+
     def __init__(self, parent=None):
         super(PypeInfoWidget, self).__init__(parent)
 
+        self._scroll_at_bottom = False
+
         self.setStyleSheet(style.load_stylesheet())
 
         icon = QtGui.QIcon(resources.pype_icon_filepath())
@@ -219,11 +228,39 @@ class PypeInfoWidget(QtWidgets.QWidget):
         main_layout.addWidget(scroll_area, 1)
         main_layout.addWidget(self._create_btns_section(), 0)
 
+        scroll_area.verticalScrollBar().valueChanged.connect(
+            self._on_area_scroll
+        )
+        self._resized.connect(self._on_resize)
         self.resize(740, 540)
 
         self.scroll_area = scroll_area
         self.info_widget = info_widget
 
+    def _on_area_scroll(self, value):
+        vertical_bar = self.scroll_area.verticalScrollBar()
+        self._scroll_at_bottom = vertical_bar.maximum() == vertical_bar.value()
+        self.info_widget.set_scroll_enabled(self._scroll_at_bottom)
+
+    def _on_resize(self):
+        if not self._scroll_at_bottom:
+            return
+        vertical_bar = self.scroll_area.verticalScrollBar()
+        vertical_bar.setValue(vertical_bar.maximum())
+
+    def resizeEvent(self, event):
+        super(PypeInfoWidget, self).resizeEvent(event)
+        self._resized.emit()
+        self.info_widget.set_content_height(
+            self.scroll_area.height()
+        )
+
+    def showEvent(self, event):
+        super(PypeInfoWidget, self).showEvent(event)
+        self.info_widget.set_content_height(
+            self.scroll_area.height()
+        )
+
     def _create_btns_section(self):
         btns_widget = QtWidgets.QWidget(self)
         btns_layout = QtWidgets.QHBoxLayout(btns_widget)
@@ -282,6 +319,8 @@ class PypeInfoSubWidget(QtWidgets.QWidget):
     def __init__(self, parent=None):
         super(PypeInfoSubWidget, self).__init__(parent)
 
+        self.env_view = None
+
         main_layout = QtWidgets.QVBoxLayout(self)
         main_layout.setContentsMargins(0, 0, 0, 0)
         main_layout.setAlignment(QtCore.Qt.AlignTop)
@@ -293,6 +332,14 @@ class PypeInfoSubWidget(QtWidgets.QWidget):
         main_layout.addWidget(self._create_separator(), 0)
         main_layout.addWidget(self._create_environ_widget(), 1)
 
+    def set_content_height(self, height):
+        if self.env_view:
+            self.env_view.setMinimumHeight(height)
+
+    def set_scroll_enabled(self, value):
+        if self.env_view:
+            self.env_view.set_scroll_enabled(value)
+
     def _create_separator(self):
         separator_widget = QtWidgets.QWidget(self)
         separator_widget.setObjectName("Separator")
@@ -369,9 +416,10 @@ class PypeInfoSubWidget(QtWidgets.QWidget):
 
         env_view = EnvironmentsView(env_widget)
         env_view.setMinimumHeight(300)
-
         env_widget.set_content_widget(env_view)
 
+        self.env_view = env_view
+
         return env_widget
 
     def _create_openpype_info_widget(self):