#------------------------------------------------------------------------------
# Copyright (c) 2011, Enthought, Inc.
# All rights reserved.
#------------------------------------------------------------------------------
import sys
from .qt.QtCore import Qt, QSize, Signal
from .qt.QtGui import QGroupBox
from .qt_container import QtContainer
QT_ALIGNMENTS = {
'left': Qt.AlignLeft,
'right': Qt.AlignRight,
'center': Qt.AlignHCenter,
}
class QResizingGroupBox(QGroupBox):
""" A subclass of QGroupBox which behaves like a container.
"""
#: A signal which is emitted on a resize event.
resized = Signal()
#: The internally cached size hint.
_size_hint = QSize()
def resizeEvent(self, event):
""" Converts a resize event into a signal.
"""
super(QResizingGroupBox, self).resizeEvent(event)
self.resized.emit()
def sizeHint(self):
""" Returns the previously set size hint. If that size hint is
invalid, the superclass' sizeHint will be used.
"""
hint = self._size_hint
if not hint.isValid():
return super(QResizingGroupBox, self).sizeHint()
return QSize(hint)
def setSizeHint(self, hint):
""" Sets the size hint to use for this widget.
"""
self._size_hint = QSize(hint)
def minimumSizeHint(self):
""" Returns the minimum size hint of the widget.
The minimum size hint for a QResizingGroupBox is conceptually
the same as its size hint, so we just return that value.
"""
return self.sizeHint()
[docs]class QtGroupBox(QtContainer):
""" A Qt implementation of an Enaml GroupBox.
"""
#--------------------------------------------------------------------------
# Setup methods
#--------------------------------------------------------------------------
[docs] def create_widget(self, parent, tree):
""" Creates the underlying QGroupBox control.
"""
widget = QResizingGroupBox(parent)
if sys.platform == 'darwin':
# On OSX, the widget item layout rect is too small.
# Setting this attribute forces the widget item to
# use the widget rect for layout.
widget.setAttribute(Qt.WA_LayoutUsesWidgetRect, True)
return widget
[docs] def create(self, tree):
""" Create and initialize the underlying widget.
"""
super(QtGroupBox, self).create(tree)
self.set_title(tree['title'])
self.set_flat(tree['flat'])
self.set_title_align(tree['title_align'])
#--------------------------------------------------------------------------
# Layout Handling
#--------------------------------------------------------------------------
[docs] def contents_margins(self):
""" Get the current contents margins for the group box.
"""
m = self.widget().contentsMargins()
return (m.top(), m.right(), m.bottom(), m.left())
#--------------------------------------------------------------------------
# Message Handlers
#--------------------------------------------------------------------------
[docs] def on_action_set_title(self, content):
""" Handle the 'set_title' action from the Enaml widget.
"""
widget = self.widget()
old_margins = widget.contentsMargins()
self.set_title(content['title'])
new_margins = widget.contentsMargins()
if old_margins != new_margins:
self.contents_margins_updated()
[docs] def on_action_set_title_align(self, content):
""" Handle the 'set_title_align' action from the Enaml widget.
"""
self.set_title_align(content['title_align'])
[docs] def on_action_set_flat(self, content):
""" Handle the 'set_flat' action from the Enaml widget.
"""
self.set_flat(content['flat'])
#--------------------------------------------------------------------------
# Widget Update methods
#--------------------------------------------------------------------------
[docs] def set_title(self, title):
""" Updates the title of group box.
"""
self.widget().setTitle(title)
[docs] def set_flat(self, flat):
""" Updates the flattened appearance of the group box.
"""
self.widget().setFlat(flat)
[docs] def set_title_align(self, align):
""" Updates the alignment of the title of the group box.
"""
qt_align = QT_ALIGNMENTS[align]
self.widget().setAlignment(qt_align)