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"""Helper functions for a simple layout algorithm -- the same one used by
OverlayPlotContainer. Designed to be called from a container, but
separated out because they are useful from ViewPort and Container"""
def simple_container_get_preferred_size(container, components=None):
""" Returns the size (width,height) that is preferred for this component.
Overrides PlotComponent.
"""
if container.fixed_preferred_size is not None:
return container.fixed_preferred_size
if container.resizable == "":
return container.outer_bounds
if components is None:
components = container.components
fit_components = getattr(container, "fit_components", "")
# this is used to determine if we should use our default bounds
no_visible_components = True
max_width = 0.0
max_height = 0.0
if fit_components != "":
for component in components:
if not container._should_layout(component):
continue
no_visible_components = False
pref_size = None
if "h" in fit_components:
pref_size = component.get_preferred_size()
if pref_size[0] > max_width:
max_width = pref_size[0]
if "v" in fit_components:
if pref_size is None:
pref_size = component.get_preferred_size()
if pref_size[1] > max_height:
max_height = pref_size[1]
if "h" not in fit_components:
max_width = container.width
if no_visible_components or (max_width == 0):
max_width = container.default_size[0]
if "v" not in fit_components:
max_height = container.height
if no_visible_components or (max_height == 0):
max_height = container.default_size[1]
# Add in our padding and border
container._cached_preferred_size = (max_width + container.hpadding, max_height + container.vpadding)
return container._cached_preferred_size
def simple_container_do_layout(container, components=None):
""" Actually performs a layout (called by do_layout()).
"""
if components is None:
components = container.components
x = container.x
y = container.y
width = container.width
height = container.height
for component in components:
if hasattr(container, '_should_layout'):
if not container._should_layout(component):
continue
position = list(component.outer_position)
bounds = list(component.outer_bounds)
if "h" in component.resizable:
position[0] = 0
bounds[0] = width
if "v" in component.resizable:
position[1] = 0
bounds[1] = height
# Set both bounds at once. This is a slight perforance fix because
# it only fires two trait events instead of four. It is also needed
# in order for the event-based aspect ratio enforcement code to work.
component.outer_position = position
component.outer_bounds = bounds
# Tell all of our components to do a layout
for component in components:
component.do_layout()
return
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