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# This file is part of ranger, the console file manager.
# License: GNU GPL version 3, see the file "AUTHORS" for details.
from ranger.core.shared import FileManagerAware
from ranger.gui.curses_shortcuts import CursesShortcuts
class Displayable(FileManagerAware, CursesShortcuts):
"""Displayables are objects which are displayed on the screen.
This is just the abstract class, defining basic operations
such as resizing, printing, changing colors.
Subclasses of displayable can extend these methods:
draw() -- draw the object. Is only called if visible.
poke() -- is called just before draw(), even if not visible.
finalize() -- called after all objects finished drawing.
click(event) -- called with a MouseEvent. This is called on all
visible objects under the mouse, until one returns True.
press(key) -- called after a key press on focused objects.
destroy() -- called before destroying the displayable object
Additionally, there are these methods:
__contains__(item) -- is the item (y, x) inside the widget?
These attributes are set:
Modifiable:
focused -- Focused objects receive press() calls.
visible -- Visible objects receive draw() and finalize() calls
need_redraw -- Should the widget be redrawn? This variable may
be set at various places in the script and should eventually be
handled (and unset) in the draw() method.
Read-Only: (i.e. recommended not to change manually)
win -- the own curses window object
parent -- the parent (DisplayableContainer) object or None
x, y, wid, hei -- absolute coordinates and boundaries
settings, fm -- inherited shared variables
"""
def __init__(self, win, env=None, fm=None, settings=None):
from ranger.gui.ui import UI
if env is not None:
self.env = env
if fm is not None:
self.fm = fm
if settings is not None:
self.settings = settings
self.need_redraw = True
self.focused = False
self.visible = True
self.x = 0
self.y = 0
self.wid = 0
self.hei = 0
self.paryx = (0, 0)
self.parent = None
self._old_visible = self.visible
if win is not None:
if isinstance(self, UI):
self.win = win
else:
self.win = win.derwin(1, 1, 0, 0)
def __nonzero__(self):
"""Always True"""
return True
__bool__ = __nonzero__
def __contains__(self, item):
"""Checks if item is inside the boundaries.
item can be an iterable like [y, x] or an object with x and y methods.
"""
try:
y, x = item.y, item.x
except AttributeError:
try:
y, x = item
except (ValueError, TypeError):
return False
return self.contains_point(y, x)
def draw(self):
"""Draw the oject.
Called on every main iteration if visible. Containers should call
draw() on their contained objects here. Override this!
"""
def destroy(self):
"""Called when the object is destroyed."""
if hasattr(self, 'win'):
del self.win
def contains_point(self, y, x):
"""Test whether the point lies inside this object.
x and y should be absolute coordinates.
"""
return (x >= self.x and x < self.x + self.wid) and \
(y >= self.y and y < self.y + self.hei)
def click(self, event):
"""Called when a mouse key is pressed and self.focused is True.
Override this!
"""
pass
def press(self, key):
"""Called when a key is pressed and self.focused is True.
Override this!
"""
pass
def poke(self):
"""Called before drawing, even if invisible"""
if self._old_visible != self.visible:
self._old_visible = self.visible
self.need_redraw = True
if not self.visible:
self.win.erase()
def finalize(self):
"""Called after every displayable is done drawing.
Override this!
"""
pass
def resize(self, y, x, hei=None, wid=None):
"""Resize the widget"""
do_move = True
try:
maxy, maxx = self.fm.ui.termsize
except TypeError:
pass
else:
if hei is None:
hei = maxy - y
if wid is None:
wid = maxx - x
if x < 0 or y < 0:
self.fm.notify("Warning: Subwindow origin below zero for <%s> "
"(x = %d, y = %d)" % (self, x, y), bad=True)
if x + wid > maxx or y + hei > maxy:
self.fm.notify("Warning: Subwindow size out of bounds for <%s> "
"(x = %d, y = %d, hei = %d, wid = %d)" % (self,
x, y, hei, wid), bad=True)
window_is_cleared = False
if hei != self.hei or wid != self.wid:
#log("resizing " + str(self))
self.win.erase()
self.need_redraw = True
window_is_cleared = True
try:
self.win.resize(hei, wid)
except Exception:
# Not enough space for resizing...
try:
self.win.mvderwin(0, 0)
do_move = True
self.win.resize(hei, wid)
except Exception:
pass
#raise ValueError("Resizing Failed!")
self.hei, self.wid = self.win.getmaxyx()
if do_move or y != self.paryx[0] or x != self.paryx[1]:
if not window_is_cleared:
self.win.erase()
self.need_redraw = True
#log("moving " + str(self))
try:
self.win.mvderwin(y, x)
except Exception:
pass
self.paryx = self.win.getparyx()
self.y, self.x = self.paryx
if self.parent:
self.y += self.parent.y
self.x += self.parent.x
def __str__(self):
return self.__class__.__name__
class DisplayableContainer(Displayable):
"""DisplayableContainers are Displayables which contain other Displayables.
This is also an abstract class. The methods draw, poke, finalize,
click, press and destroy are extended here and will recursively
call the function on all contained objects.
New methods:
add_child(object) -- add the object to the container.
replace_child(old_obj, new_obj) -- replaces old object with new object.
remove_child(object) -- remove the object from the container.
New attributes:
container -- a list with all contained objects (rw)
"""
def __init__(self, win, env=None, fm=None, settings=None):
if env is not None:
self.env = env
if fm is not None:
self.fm = fm
if settings is not None:
self.settings = settings
self.container = []
Displayable.__init__(self, win)
# ------------------------------------ extended or overidden methods
def poke(self):
"""Recursively called on objects in container"""
Displayable.poke(self)
for displayable in self.container:
displayable.poke()
def draw(self):
"""Recursively called on visible objects in container"""
for displayable in self.container:
if self.need_redraw:
displayable.need_redraw = True
if displayable.visible:
displayable.draw()
self.need_redraw = False
def finalize(self):
"""Recursively called on visible objects in container"""
for displayable in self.container:
if displayable.visible:
displayable.finalize()
def press(self, key):
"""Recursively called on objects in container"""
focused_obj = self._get_focused_obj()
if focused_obj:
focused_obj.press(key)
return True
return False
def click(self, event):
"""Recursively called on objects in container"""
focused_obj = self._get_focused_obj()
if focused_obj and focused_obj.click(event):
return True
for displayable in self.container:
if displayable.visible and event in displayable:
if displayable.click(event):
return True
return False
def destroy(self):
"""Recursively called on objects in container"""
for displayable in self.container:
displayable.destroy()
# ----------------------------------------------- new methods
def add_child(self, obj):
"""Add the objects to the container."""
if obj.parent:
obj.parent.remove_child(obj)
self.container.append(obj)
obj.parent = self
def replace_child(self, old_obj, new_obj):
"""
Replace the old object with the new instance in the container.
The new object will have the same position in the list as old_obj.
If old_obj is not in the list, new_obj will simply be appended.
"""
try:
index = self.container.index(old_obj)
except ValueError:
self.add_child(new_obj)
else:
self.container[index] = new_obj
new_obj.parent = self
def remove_child(self, obj):
"""Remove the object from the container."""
try:
self.container.remove(obj)
except ValueError:
pass
else:
obj.parent = None
def _get_focused_obj(self):
# Finds a focused displayable object in the container.
for displayable in self.container:
if displayable.focused:
return displayable
try:
obj = displayable._get_focused_obj()
except AttributeError:
pass
else:
if obj is not None:
return obj
return None
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