added placeholder widget fixing color of placeholder

openpype/tools/utils/widgets.py

@@ -7,6 +7,7 @@ from Qt import QtWidgets, QtCore, QtGui
 from avalon.vendor import qtawesome, qargparse
 
 from avalon import style
+from openpype.style import get_objected_colors
 
 from .models import AssetModel, RecursiveSortFilterProxyModel
 from .views import AssetsView
@@ -15,6 +16,28 @@ from .delegates import AssetDelegate
 log = logging.getLogger(__name__)
 
 
+class PlaceholderLineEdit(QtWidgets.QLineEdit):
+    """Set placeholder color of QLineEdit in Qt 5.12 and higher."""
+    def __init__(self, *args, **kwargs):
+        super(PlaceholderLineEdit, self).__init__(*args, **kwargs)
+        self._first_show = True
+
+    def showEvent(self, event):
+        super(PlaceholderLineEdit, self).showEvent(event)
+        if self._first_show:
+            self._first_show = False
+            filter_palette = self.palette()
+            if hasattr(filter_palette, "PlaceholderText"):
+                color_obj = get_objected_colors()["font"]
+                color = color_obj.get_qcolor()
+                color.setAlpha(67)
+                filter_palette.setColor(
+                    filter_palette.PlaceholderText,
+                    color
+                )
+                self.setPalette(filter_palette)
+
+
 class AssetWidget(QtWidgets.QWidget):
     """A Widget to display a tree of assets with filter