def layout_constraints(self):
""" The constraints generation for a HGroup.
This method supplies horizontal group constraints for the
children of the container in addition to any user-supplied
constraints.
"""
widgets = self.visible_widgets()
items = [self.leading_spacer] + widgets + [self.trailing_spacer]
cns = self.constraints[:]
cns.append(hbox(*items, spacing=self.spacing))
cns.append(align('v_center', *widgets))
if self.align_widths:
cns.append(align('width', *widgets))
return cns
def _component_constraints(self):
""" Supplies the constraints which layout the children in a
two column form.
"""
# FIXME: do something sensible when children are not visible.
children = list(self.widgets)
labels = children[::2]
widgets = children[1::2]
n_labels = len(labels)
n_widgets = len(widgets)
if n_labels != n_widgets:
if n_labels > n_widgets:
odd_child = labels.pop()
else:
odd_child = widgets.pop()
else:
odd_child = None
layout_strength = self.layout_strength
constraints = []
# Align the left side of each widget with the midline constraint
# variable of the form.
midline = self.midline
for widget in widgets:
cn = (widget.left == midline) | layout_strength
constraints.append(cn)
# Arrange each label/widget pair horizontally in the form
# XXX this is a highly inefficient way to generate these
# constraints. It starts to be noticeably slow when the
# form has around 20 rows. This can be done better.
labels_widgets = zip(labels, widgets)
vbox_args = [hbox(label, widget) for label, widget in labels_widgets]
if odd_child is not None:
vbox_args.append(odd_child)
constraints.append(vbox(*vbox_args))
for label, widget in labels_widgets:
# FIXME: baselines would be much better.
constraints.append(
align('v_center', label, widget) | layout_strength)
return constraints
def _component_constraints(self):
""" Supplies the constraints which layout the children in a
two column form.
"""
# FIXME: do something sensible when children are not visible.
children = list(self.widgets)
labels = children[::2]
widgets = children[1::2]
n_labels = len(labels)
n_widgets = len(widgets)
if n_labels != n_widgets:
if n_labels > n_widgets:
odd_child = labels.pop()
else:
odd_child = widgets.pop()
else:
odd_child = None
layout_strength = self.layout_strength
constraints = []
# Align the left side of each widget with the midline constraint
# variable of the form.
midline = self.midline
for widget in widgets:
cn = (widget.left == midline) | layout_strength
constraints.append(cn)
# Arrange each label/widget pair horizontally in the form
# XXX this is a highly inefficient way to generate these
# constraints. It starts to be noticeably slow when the
# form has around 20 rows. This can be done better.
labels_widgets = zip(labels, widgets)
vbox_args = [hbox(label, widget) for label, widget in labels_widgets]
if odd_child is not None:
vbox_args.append(odd_child)
constraints.append(vbox(*vbox_args))
for label, widget in labels_widgets:
# FIXME: baselines would be much better.
constraints.append(align('v_center', label, widget) | layout_strength)
return constraints
def layout_constraints(self):
""" The constraints generation for a HGroup.
This method supplies horizontal group constraints for the
children of the container in addition to any user-supplied
constraints.
This method cannot be overridden from Enaml syntax.
"""
widgets = self.visible_widgets()
items = [self.leading_spacer] + widgets + [self.trailing_spacer]
cns = self.constraints[:]
cns.append(hbox(*items, spacing=self.spacing))
cns.append(align('v_center', *widgets))
if self.align_widths:
cns.append(align('width', *widgets))
return cns
