1 files changed, 94 insertions, 8 deletions

diff --git a/src/silx/gui/widgets/FloatEdit.py b/src/silx/gui/widgets/FloatEdit.py
index 61f518f..f9d7331 100644
--- a/src/silx/gui/widgets/FloatEdit.py
+++ b/src/silx/gui/widgets/FloatEdit.py
@@ -1,6 +1,6 @@
 # /*##########################################################################
 #
-# Copyright (c) 2004-2021 European Synchrotron Radiation Facility
+# Copyright (c) 2004-2023 European Synchrotron Radiation Facility
 #
 # Permission is hereby granted, free of charge, to any person obtaining a copy
 # of this software and associated documentation files (the "Software"), to deal
@@ -23,6 +23,8 @@
 # ###########################################################################*/
 """Module contains a float editor
 """
+from __future__ import annotations
+
 
 __authors__ = ["V.A. Sole", "T. Vincent"]
 __license__ = "MIT"
@@ -34,18 +36,33 @@ from .. import qt
 class FloatEdit(qt.QLineEdit):
     """Field to edit a float value.
 
-    :param parent: See :class:`QLineEdit`
-    :param float value: The value to set the QLineEdit to.
+    The value can be modified with :meth:`value` and :meth:`setValue`.
+
+    The property :meth:`widgetResizable` allow to change the default
+    behaviour in order to automatically resize the widget to the displayed value.
+    Use :meth:`setMinimumWidth` to enforce the minimum width.
+
+    :param parent: Parent of the widget
+    :param value: The value to set the QLineEdit to.
     """
-    def __init__(self, parent=None, value=None):
+
+    _QLineEditPrivateHorizontalMargin = 2
+    """Constant from Qt source code"""
+
+    def __init__(self, parent: qt.QWidget | None = None, value: float | None = None):
         qt.QLineEdit.__init__(self, parent)
         validator = qt.QDoubleValidator(self)
+        self.__widgetResizable: bool = False
+        self.__minimumWidth = 30
+        """Store the minimum width requested by the user, the real one is
+        dynamic"""
         self.setValidator(validator)
         self.setAlignment(qt.Qt.AlignRight)
+        self.textChanged.connect(self.__textChanged)
         if value is not None:
             self.setValue(value)
 
-    def value(self):
+    def value(self) -> float:
         """Return the QLineEdit current value as a float."""
         text = self.text()
         value, validated = self.validator().locale().toDouble(text)
@@ -53,16 +70,85 @@ class FloatEdit(qt.QLineEdit):
             self.setValue(value)
         return value
 
-    def setValue(self, value):
+    def setValue(self, value: float):
         """Set the current value of the LineEdit
 
-        :param float value: The value to set the QLineEdit to.
+        :param value: The value to set the QLineEdit to.
         """
         locale = self.validator().locale()
         if qt.BINDING == "PySide6":
             # Fix for PySide6 not selecting the right method
-            text = locale.toString(float(value), 'g')
+            text = locale.toString(float(value), "g")
         else:
             text = locale.toString(float(value))
 
         self.setText(text)
+        if self.__widgetResizable:
+            self.__forceMinimumWidthFromContent()
+
+    def __textChanged(self, text: str):
+        if self.__widgetResizable:
+            self.__forceMinimumWidthFromContent()
+
+    def widgetResizable(self) -> bool:
+        """
+        Returns whether or not the widget auto resizes itself based on it's content
+        """
+        return self.__widgetResizable
+
+    def setWidgetResizable(self, resizable: bool):
+        """
+        If true, the widget will automatically resize itself to its displayed content.
+
+        This avoids to have to scroll to see the widget's content, and allow to take
+        advantage of extra space.
+        """
+        if self.__widgetResizable == resizable:
+            return
+        self.__widgetResizable = resizable
+        self.updateGeometry()
+        if resizable:
+            self.__forceMinimumWidthFromContent()
+        else:
+            qt.QLineEdit.setMinimumWidth(self, self.__minimumWidth)
+
+    def __minimumWidthFromContent(self) -> int:
+        """Minimum size for the widget to properly read the actual number"""
+        text = self.text()
+        font = self.font()
+        metrics = qt.QFontMetrics(font)
+        margins = self.textMargins()
+        width = (
+            metrics.horizontalAdvance(text)
+            + self._QLineEditPrivateHorizontalMargin * 2
+            + margins.left()
+            + margins.right()
+        )
+        width = max(self.__minimumWidth, width)
+        opt = qt.QStyleOptionFrame()
+        self.initStyleOption(opt)
+        s = self.style().sizeFromContents(
+            qt.QStyle.CT_LineEdit, opt, qt.QSize(width, self.height())
+        )
+        return s.width()
+
+    def sizeHint(self) -> qt.QSize:
+        sizeHint = qt.QLineEdit.sizeHint(self)
+        if not self.__widgetResizable:
+            return sizeHint
+        width = self.__minimumWidthFromContent()
+        return qt.QSize(width, sizeHint.height())
+
+    def __forceMinimumWidthFromContent(self):
+        width = self.__minimumWidthFromContent()
+        qt.QLineEdit.setMinimumWidth(self, width)
+        self.updateGeometry()
+
+    def setMinimumWidth(self, width: int):
+        self.__minimumWidth = width
+        qt.QLineEdit.setMinimumWidth(self, width)
+        self.updateGeometry()
+
+    def minimumWidth(self) -> int:
+        """Returns the user defined minimum width."""
+        return self.__minimumWidth