from __future__ import absolute_import
# System modules
import curses
import curses.panel
import sys
import time
# Third-party modules
import six
# LLDB modules
class Point(object):
def __init__(self, x, y):
self.x = x
self.y = y
def __repr__(self):
return str(self)
def __str__(self):
return "(x=%u, y=%u)" % (self.x, self.y)
def __eq__(self, rhs):
return self.x == rhs.x and self.y == rhs.y
def __ne__(self, rhs):
return self.x != rhs.x or self.y != rhs.y
def is_valid_coordinate(self):
return self.x >= 0 and self.y >= 0
class Size(object):
def __init__(self, w, h):
self.w = w
self.h = h
def __repr__(self):
return str(self)
def __str__(self):
return "(w=%u, h=%u)" % (self.w, self.h)
def __eq__(self, rhs):
return self.w == rhs.w and self.h == rhs.h
def __ne__(self, rhs):
return self.w != rhs.w or self.h != rhs.h
class Rect(object):
def __init__(self, x=0, y=0, w=0, h=0):
self.origin = Point(x, y)
self.size = Size(w, h)
def __repr__(self):
return str(self)
def __str__(self):
return "{ %s, %s }" % (str(self.origin), str(self.size))
def get_min_x(self):
return self.origin.x
def get_max_x(self):
return self.origin.x + self.size.w
def get_min_y(self):
return self.origin.y
def get_max_y(self):
return self.origin.y + self.size.h
def contains_point(self, pt):
if pt.x < self.get_max_x():
if pt.y < self.get_max_y():
if pt.x >= self.get_min_y():
return pt.y >= self.get_min_y()
return False
def __eq__(self, rhs):
return self.origin == rhs.origin and self.size == rhs.size
def __ne__(self, rhs):
return self.origin != rhs.origin or self.size != rhs.size
class QuitException(Exception):
def __init__(self):
super(QuitException, self).__init__('QuitException')
class Window(object):
def __init__(self, window, delegate = None, can_become_first_responder = True):
self.window = window
self.parent = None
self.delegate = delegate
self.children = list()
self.first_responders = list()
self.can_become_first_responder = can_become_first_responder
self.key_actions = dict()
def add_child(self, window):
self.children.append(window)
window.parent = self
def resize(self, size):
self.window.resize(size.h, size.w)
def resize_child(self, child, delta_size, adjust_neighbors):
if child in self.children:
frame = self.get_frame()
orig_frame = child.get_frame()
new_frame = Rect(x=orig_frame.origin.x, y=orig_frame.origin.y, w=orig_frame.size.w + delta_size.w, h=orig_frame.size.h + delta_size.h)
old_child_max_x = orig_frame.get_max_x()
new_child_max_x = new_frame.get_max_x()
window_max_x = frame.get_max_x()
if new_child_max_x < window_max_x:
child.resize(new_frame.size)
if old_child_max_x == window_max_x:
new_frame.origin.x += window_max_x - new_child_max_x
child.set_position(new_frame.origin)
elif new_child_max_x > window_max_x:
new_frame.origin.x -= new_child_max_x - window_max_x
child.set_position(new_frame.origin)
child.resize(new_frame.size)
if adjust_neighbors:
#print('orig_frame = %s\r\n' % (str(orig_frame)), end='')
for curr_child in self.children:
if curr_child is child:
continue
curr_child_frame = curr_child.get_frame()
if delta_size.w != 0:
#print('curr_child_frame = %s\r\n' % (str(curr_child_frame)), end='')
if curr_child_frame.get_min_x() == orig_frame.get_max_x():
curr_child_frame.origin.x += delta_size.w
curr_child_frame.size.w -= delta_size.w
#print('adjusted curr_child_frame = %s\r\n' % (str(curr_child_frame)), end='')
curr_child.resize (curr_child_frame.size)
curr_child.slide_position (Size(w=delta_size.w, h=0))
elif curr_child_frame.get_max_x() == orig_frame.get_min_x():
curr_child_frame.size.w -= delta_size.w
#print('adjusted curr_child_frame = %s\r\n' % (str(curr_child_frame)), end='')
curr_child.resize (curr_child_frame.size)
def add_key_action(self, arg, callback, decription):
if isinstance(arg, list):
for key in arg:
self.add_key_action(key, callback, description)
else:
if isinstance(arg, six.integer_types):
key_action_dict = { 'key' : arg,
'callback' : callback,
'description' : decription }
self.key_actions[arg] = key_action_dict
elif isinstance(arg, basestring):
key_integer = ord(arg)
key_action_dict = { 'key' : key_integer,
'callback' : callback,
'description' : decription }
self.key_actions[key_integer] = key_action_dict
else:
raise ValueError
def draw_title_box(self, title):
is_in_first_responder_chain = self.is_in_first_responder_chain()
if is_in_first_responder_chain:
self.attron (curses.A_REVERSE)
self.box()
if is_in_first_responder_chain:
self.attroff (curses.A_REVERSE)
if title:
self.addstr(Point(x=2, y=0), ' ' + title + ' ')
def remove_child(self, window):
self.children.remove(window)
def get_first_responder(self):
if len(self.first_responders):
return self.first_responders[-1]
else:
return None
def set_first_responder(self, window):
if window.can_become_first_responder:
if six.callable(getattr(window, "hidden", None)) and window.hidden():
return False
if not window in self.children:
self.add_child(window)
# See if we have a current first responder, and if we do, let it know that
# it will be resigning as first responder
first_responder = self.get_first_responder()
if first_responder:
first_responder.relinquish_first_responder()
# Now set the first responder to "window"
if len(self.first_responders) == 0:
self.first_responders.append(window)
else:
self.first_responders[-1] = window
return True
else:
return False
def push_first_responder(self, window):
# Only push the window as the new first responder if the window isn't already the first responder
if window != self.get_first_responder():
self.first_responders.append(window)
def pop_first_responder(self, window):
# Only pop the window from the first responder list if it is the first responder
if window == self.get_first_responder():
old_first_responder = self.first_responders.pop()
old_first_responder.relinquish_first_responder()
return True
else:
return False
def relinquish_first_responder(self):
'''Override if there is something that you need to do when you lose first responder status.'''
pass
# def resign_first_responder(self, remove_from_parent, new_first_responder):
# success = False
# if self.parent:
# if self.is_first_responder():
# self.relinquish_first_responder()
# if len(self.parent.first_responder):
# self.parent.first_responder = None
# success = True
# if remove_from_parent:
# self.parent.remove_child(self)
# if new_first_responder:
# self.parent.set_first_responder(new_first_responder)
# else:
# self.parent.select_next_first_responder()
# return success
def is_first_responder(self):
if self.parent:
return self.parent.get_first_responder() == self
else:
return False
def is_in_first_responder_chain(self):
if self.parent:
return self in self.parent.first_responders
else:
return False
def select_next_first_responder(self):
if len(self.first_responders) > 1:
self.pop_first_responder(self.first_responders[-1])
else:
num_children = len(self.children)
if num_children == 1:
return self.set_first_responder(self.children[0])
for (i,window) in enumerate(self.children):
if window.is_first_responder():
break
if i < num_children:
for i in range(i+1,num_children):
if self.set_first_responder(self.children[i]):
return True
for i in range(0, i):
if self.set_first_responder(self.children[i]):
return True
def point_in_window(self, pt):
size = self.get_size()
return pt.x >= 0 and pt.x < size.w and pt.y >= 0 and pt.y < size.h
def addch(self, c):
try:
self.window.addch(c)
except:
pass
def addch_at_point(self, pt, c):
try:
self.window.addch(pt.y, pt.x, c)
except:
pass
def addstr(self, pt, str):
try:
self.window.addstr(pt.y, pt.x, str)
except:
pass
def addnstr_at_point(self, pt, str, n):
try:
self.window.addnstr(pt.y, pt.x, str, n)
except:
pass
def addnstr(self, str, n):
try:
self.window.addnstr(str, n)
except:
pass
def attron(self, attr):
return self.window.attron (attr)
def attroff(self, attr):
return self.window.attroff (attr)
def box(self, vertch=0, horch=0):
if vertch == 0:
vertch = curses.ACS_VLINE
if horch == 0:
horch = curses.ACS_HLINE
self.window.box(vertch, horch)
def get_contained_rect(self, top_inset=0, bottom_inset=0, left_inset=0, right_inset=0, height=-1, width=-1):
'''Get a rectangle based on the top "height" lines of this window'''
rect = self.get_frame()
x = rect.origin.x + left_inset
y = rect.origin.y + top_inset
if height == -1:
h = rect.size.h - (top_inset + bottom_inset)
else:
h = height
if width == -1:
w = rect.size.w - (left_inset + right_inset)
else:
w = width
return Rect (x = x, y = y, w = w, h = h)
def erase(self):
self.window.erase()
def get_cursor(self):
(y, x) = self.window.getyx()
return Point(x=x, y=y)
def get_frame(self):
position = self.get_position()
size = self.get_size()
return Rect(x=position.x, y=position.y, w=size.w, h=size.h)
def get_frame_in_parent(self):
position = self.get_position_in_parent()
size = self.get_size()
return Rect(x=position.x, y=position.y, w=size.w, h=size.h)
def get_position_in_parent(self):
(y, x) = self.window.getparyx()
return Point(x, y)
def get_position(self):
(y, x) = self.window.getbegyx()
return Point(x, y)
def get_size(self):
(y, x) = self.window.getmaxyx()
return Size(w=x, h=y)
def move(self, pt):
self.window.move(pt.y, pt.x)
def refresh(self):
self.update()
curses.panel.update_panels()
self.move(Point(x=0, y=0))
return self.window.refresh()
def resize(self, size):
return self.window.resize(size.h, size.w)
def timeout(self, timeout_msec):
return self.window.timeout(timeout_msec)
def handle_key(self, key, check_parent=True):
'''Handle a key press in this window.'''
# First try the first responder if this window has one, but don't allow
# it to check with its parent (False second parameter) so we don't recurse
# and get a stack overflow
for first_responder in reversed(self.first_responders):
if first_responder.handle_key(key, False):
return True
# Check our key map to see if we have any actions. Actions don't take
# any arguments, they must be callable
if key in self.key_actions:
key_action = self.key_actions[key]
key_action['callback']()
return True
# Check if there is a wildcard key for any key
if -1 in self.key_actions:
key_action = self.key_actions[-1]
key_action['callback']()
return True
# Check if the window delegate wants to handle this key press
if self.delegate:
if six.callable(getattr(self.delegate, "handle_key", None)):
if self.delegate.handle_key(self, key):
return True
if self.delegate(self, key):
return True
# Check if we have a parent window and if so, let the parent
# window handle the key press
if check_parent and self.parent:
return self.parent.handle_key(key, True)
else:
return False # Key not handled
def update(self):
for child in self.children:
child.update()
def quit_action(self):
raise QuitException
def get_key(self, timeout_msec=-1):
self.timeout(timeout_msec)
done = False
c = self.window.getch()
if c == 27:
self.timeout(0)
escape_key = 0
while True:
escape_key = self.window.getch()
if escape_key == -1:
break
else:
c = c << 8 | escape_key
self.timeout(timeout_msec)
return c
def key_event_loop(self, timeout_msec=-1, n=sys.maxsize):
'''Run an event loop to receive key presses and pass them along to the
responder chain.
timeout_msec is the timeout it milliseconds. If the value is -1, an
infinite wait will be used. It the value is zero, a non-blocking mode
will be used, and if greater than zero it will wait for a key press
for timeout_msec milliseconds.
n is the number of times to go through the event loop before exiting'''
done = False
while not done and n > 0:
c = self.get_key(timeout_msec)
if c != -1:
try:
self.handle_key(c)
except QuitException:
done = True
n -= 1
class Panel(Window):
def __init__(self, frame, delegate = None, can_become_first_responder = True):
window = curses.newwin(frame.size.h,frame.size.w, frame.origin.y, frame.origin.x)
super(Panel, self).__init__(window, delegate, can_become_first_responder)
self.panel = curses.panel.new_panel(window)
def hide(self):
return self.panel.hide()
def hidden(self):
return self.panel.hidden()
def show(self):
return self.panel.show()
def top(self):
return self.panel.top()
def set_position(self, pt):
self.panel.move(pt.y, pt.x)
def slide_position(self, size):
new_position = self.get_position()
new_position.x = new_position.x + size.w
new_position.y = new_position.y + size.h
self.set_position(new_position)
class BoxedPanel(Panel):
def __init__(self, frame, title, delegate = None, can_become_first_responder = True):
super(BoxedPanel, self).__init__(frame, delegate, can_become_first_responder)
self.title = title
self.lines = list()
self.first_visible_idx = 0
self.selected_idx = -1
self.add_key_action(curses.KEY_UP, self.select_prev, "Select the previous item")
self.add_key_action(curses.KEY_DOWN, self.select_next, "Select the next item")
self.add_key_action(curses.KEY_HOME, self.scroll_begin, "Go to the beginning of the list")
self.add_key_action(curses.KEY_END, self.scroll_end, "Go to the end of the list")
self.add_key_action(0x1b4f48, self.scroll_begin, "Go to the beginning of the list")
self.add_key_action(0x1b4f46, self.scroll_end, "Go to the end of the list")
self.add_key_action(curses.KEY_PPAGE, self.scroll_page_backward, "Scroll to previous page")
self.add_key_action(curses.KEY_NPAGE, self.scroll_page_forward, "Scroll to next forward")
self.update()
def clear(self, update=True):
self.lines = list()
self.first_visible_idx = 0
self.selected_idx = -1
if update:
self.update()
def get_usable_width(self):
'''Valid usable width is 0 to (width - 3) since the left and right lines display the box around
this frame and we skip a leading space'''
w = self.get_size().w
if w > 3:
return w-3
else:
return 0
def get_usable_height(self):
'''Valid line indexes are 0 to (height - 2) since the top and bottom lines display the box around this frame.'''
h = self.get_size().h
if h > 2:
return h-2
else:
return 0
def get_point_for_line(self, global_line_idx):
'''Returns the point to use when displaying a line whose index is "line_idx"'''
line_idx = global_line_idx - self.first_visible_idx
num_lines = self.get_usable_height()
if line_idx < num_lines:
return Point(x=2, y=1+line_idx)
else:
return Point(x=-1, y=-1) # return an invalid coordinate if the line index isn't valid
def set_title (self, title, update=True):
self.title = title
if update:
self.update()
def scroll_to_line (self, idx):
if idx < len(self.lines):
self.selected_idx = idx
max_visible_lines = self.get_usable_height()
if idx < self.first_visible_idx or idx >= self.first_visible_idx + max_visible_lines:
self.first_visible_idx = idx
self.refresh()
def scroll_begin (self):
self.first_visible_idx = 0
if len(self.lines) > 0:
self.selected_idx = 0
else:
self.selected_idx = -1
self.update()
def scroll_end (self):
max_visible_lines = self.get_usable_height()
num_lines = len(self.lines)
if num_lines > max_visible_lines:
self.first_visible_idx = num_lines - max_visible_lines
else:
self.first_visible_idx = 0
self.selected_idx = num_lines-1
self.update()
def scroll_page_backward(self):
num_lines = len(self.lines)
max_visible_lines = self.get_usable_height()
new_index = self.first_visible_idx - max_visible_lines
if new_index < 0:
self.first_visible_idx = 0
else:
self.first_visible_idx = new_index
self.refresh()
def scroll_page_forward(self):
max_visible_lines = self.get_usable_height()
self.first_visible_idx += max_visible_lines
self._adjust_first_visible_line()
self.refresh()
def select_next (self):
self.selected_idx += 1
if self.selected_idx >= len(self.lines):
self.selected_idx = len(self.lines) - 1
self.refresh()
def select_prev (self):
self.selected_idx -= 1
if self.selected_idx < 0:
if len(self.lines) > 0:
self.selected_idx = 0
else:
self.selected_idx = -1
self.refresh()
def get_selected_idx(self):
return self.selected_idx
def _adjust_first_visible_line(self):
num_lines = len(self.lines)
max_visible_lines = self.get_usable_height()
if (self.first_visible_idx >= num_lines) or (num_lines - self.first_visible_idx) > max_visible_lines:
self.first_visible_idx = num_lines - max_visible_lines
def append_line(self, s, update=True):
self.lines.append(s)
self._adjust_first_visible_line()
if update:
self.update()
def set_line(self, line_idx, s, update=True):
'''Sets a line "line_idx" within the boxed panel to be "s"'''
if line_idx < 0:
return
while line_idx >= len(self.lines):
self.lines.append('')
self.lines[line_idx] = s
self._adjust_first_visible_line()
if update:
self.update()
def update(self):
self.erase()
self.draw_title_box(self.title)
max_width = self.get_usable_width()
for line_idx in range(self.first_visible_idx, len(self.lines)):
pt = self.get_point_for_line(line_idx)
if pt.is_valid_coordinate():
is_selected = line_idx == self.selected_idx
if is_selected:
self.attron (curses.A_REVERSE)
self.move(pt)
self.addnstr(self.lines[line_idx], max_width)
if is_selected:
self.attroff (curses.A_REVERSE)
else:
return
def load_file(self, path):
f = open(path)
if f:
self.lines = f.read().splitlines()
for (idx, line) in enumerate(self.lines):
# Remove any tabs from lines since they hose up the display
if "\t" in line:
self.lines[idx] = (8*' ').join(line.split('\t'))
self.selected_idx = 0
self.first_visible_idx = 0
self.refresh()
class Item(object):
def __init__(self, title, action):
self.title = title
self.action = action
class TreeItemDelegate(object):
def might_have_children(self):
return False
def update_children(self, item):
'''Return a list of child Item objects'''
return None
def draw_item_string(self, tree_window, item, s):
pt = tree_window.get_cursor()
width = tree_window.get_size().w - 1
if width > pt.x:
tree_window.addnstr(s, width - pt.x)
def draw_item(self, tree_window, item):
self.draw_item_string(tree_window, item, item.title)
def do_action(self):
pass
class TreeItem(object):
def __init__(self, delegate, parent = None, title = None, action = None, is_expanded = False):
self.parent = parent
self.title = title
self.action = action
self.delegate = delegate
self.is_expanded = not parent or is_expanded == True
self._might_have_children = None
self.children = None
self._children_might_have_children = False
def get_children(self):
if self.is_expanded and self.might_have_children():
if self.children is None:
self._children_might_have_children = False
self.children = self.update_children()
for child in self.children:
if child.might_have_children():
self._children_might_have_children = True
break
else:
self._children_might_have_children = False
self.children = None
return self.children
def append_visible_items(self, items):
items.append(self)
children = self.get_children()
if children:
for child in children:
child.append_visible_items(items)
def might_have_children(self):
if self._might_have_children is None:
if not self.parent:
# Root item always might have children
self._might_have_children = True
else:
# Check with the delegate to see if the item might have children
self._might_have_children = self.delegate.might_have_children()
return self._might_have_children
def children_might_have_children(self):
return self._children_might_have_children
def update_children(self):
if self.is_expanded and self.might_have_children():
self.children = self.delegate.update_children(self)
for child in self.children:
child.update_children()
else:
self.children = None
return self.children
def get_num_visible_rows(self):
rows = 1
if self.is_expanded:
children = self.get_children()
if children:
for child in children:
rows += child.get_num_visible_rows()
return rows
def draw(self, tree_window, row):
display_row = tree_window.get_display_row(row)
if display_row >= 0:
tree_window.move(tree_window.get_item_draw_point(row))
if self.parent:
self.parent.draw_tree_for_child(tree_window, self, 0)
if self.might_have_children():
tree_window.addch (curses.ACS_DIAMOND)
tree_window.addch (curses.ACS_HLINE)
elif self.parent and self.parent.children_might_have_children():
if self.parent.parent:
tree_window.addch (curses.ACS_HLINE)
tree_window.addch (curses.ACS_HLINE)
else:
tree_window.addch (' ')
tree_window.addch (' ')
is_selected = tree_window.is_selected(row)
if is_selected:
tree_window.attron (curses.A_REVERSE)
self.delegate.draw_item(tree_window, self)
if is_selected:
tree_window.attroff (curses.A_REVERSE)
def draw_tree_for_child (self, tree_window, child, reverse_depth):
if self.parent:
self.parent.draw_tree_for_child (tree_window, self, reverse_depth + 1)
if self.children[-1] == child:
# Last child
if reverse_depth == 0:
tree_window.addch (curses.ACS_LLCORNER)
tree_window.addch (curses.ACS_HLINE)
else:
tree_window.addch (' ')
tree_window.addch (' ')
else:
# Middle child
if reverse_depth == 0:
tree_window.addch (curses.ACS_LTEE)
tree_window.addch (curses.ACS_HLINE)
else:
tree_window.addch (curses.ACS_VLINE)
tree_window.addch (' ')
def was_selected(self):
self.delegate.do_action()
class TreePanel(Panel):
def __init__(self, frame, title, root_item):
self.root_item = root_item
self.title = title
self.first_visible_idx = 0
self.selected_idx = 0
self.items = None
super(TreePanel, self).__init__(frame)
self.add_key_action(curses.KEY_UP, self.select_prev, "Select the previous item")
self.add_key_action(curses.KEY_DOWN, self.select_next, "Select the next item")
self.add_key_action(curses.KEY_RIGHT,self.right_arrow, "Expand an item")
self.add_key_action(curses.KEY_LEFT, self.left_arrow, "Unexpand an item or navigate to parent")
self.add_key_action(curses.KEY_HOME, self.scroll_begin, "Go to the beginning of the tree")
self.add_key_action(curses.KEY_END, self.scroll_end, "Go to the end of the tree")
self.add_key_action(0x1b4f48, self.scroll_begin, "Go to the beginning of the tree")
self.add_key_action(0x1b4f46, self.scroll_end, "Go to the end of the tree")
self.add_key_action(curses.KEY_PPAGE, self.scroll_page_backward, "Scroll to previous page")
self.add_key_action(curses.KEY_NPAGE, self.scroll_page_forward, "Scroll to next forward")
def get_selected_item(self):
if self.selected_idx < len(self.items):
return self.items[self.selected_idx]
else:
return None
def select_item(self, item):
if self.items and item in self.items:
self.selected_idx = self.items.index(item)
return True
else:
return False
def get_visible_items(self):
# Clear self.items when you want to update all chidren
if self.items is None:
self.items = list()
children = self.root_item.get_children()
if children:
for child in children:
child.append_visible_items(self.items)
return self.items
def update(self):
self.erase()
self.draw_title_box(self.title)
visible_items = self.get_visible_items()
for (row, child) in enumerate(visible_items):
child.draw(self, row)
def get_item_draw_point(self, row):
display_row = self.get_display_row(row)
if display_row >= 0:
return Point(2, display_row + 1)
else:
return Point(-1, -1)
def get_display_row(self, row):
if row >= self.first_visible_idx:
display_row = row - self.first_visible_idx
if display_row < self.get_size().h-2:
return display_row
return -1
def is_selected(self, row):
return row == self.selected_idx
def get_num_lines(self):
self.get_visible_items()
return len(self.items)
def get_num_visible_lines(self):
return self.get_size().h-2
def select_next (self):
self.selected_idx += 1
num_lines = self.get_num_lines()
if self.selected_idx >= num_lines:
self.selected_idx = num_lines - 1
self._selection_changed()
self.refresh()
def select_prev (self):
self.selected_idx -= 1
if self.selected_idx < 0:
num_lines = self.get_num_lines()
if num_lines > 0:
self.selected_idx = 0
else:
self.selected_idx = -1
self._selection_changed()
self.refresh()
def scroll_begin (self):
self.first_visible_idx = 0
num_lines = self.get_num_lines()
if num_lines > 0:
self.selected_idx = 0
else:
self.selected_idx = -1
self.refresh()
def redisplay_tree(self):
self.items = None
self.refresh()
def right_arrow(self):
selected_item = self.get_selected_item()
if selected_item and selected_item.is_expanded == False:
selected_item.is_expanded = True
self.redisplay_tree()
def left_arrow(self):
selected_item = self.get_selected_item()
if selected_item:
if selected_item.is_expanded == True:
selected_item.is_expanded = False
self.redisplay_tree()
elif selected_item.parent:
if self.select_item(selected_item.parent):
self.refresh()
def scroll_end (self):
num_visible_lines = self.get_num_visible_lines()
num_lines = self.get_num_lines()
if num_lines > num_visible_lines:
self.first_visible_idx = num_lines - num_visible_lines
else:
self.first_visible_idx = 0
self.selected_idx = num_lines-1
self.refresh()
def scroll_page_backward(self):
num_visible_lines = self.get_num_visible_lines()
new_index = self.selected_idx - num_visible_lines
if new_index < 0:
self.selected_idx = 0
else:
self.selected_idx = new_index
self._selection_changed()
self.refresh()
def scroll_page_forward(self):
num_lines = self.get_num_lines()
num_visible_lines = self.get_num_visible_lines()
new_index = self.selected_idx + num_visible_lines
if new_index >= num_lines:
new_index = num_lines - 1
self.selected_idx = new_index
self._selection_changed()
self.refresh()
def _selection_changed(self):
num_lines = self.get_num_lines()
num_visible_lines = self.get_num_visible_lines()
last_visible_index = self.first_visible_idx + num_visible_lines
if self.selected_idx >= last_visible_index:
self.first_visible_idx += (self.selected_idx - last_visible_index + 1)
if self.selected_idx < self.first_visible_idx:
self.first_visible_idx = self.selected_idx
if self.selected_idx >= 0 and self.selected_idx < len(self.items):
item = self.items[self.selected_idx]
item.was_selected()
class Menu(BoxedPanel):
def __init__(self, title, items):
max_title_width = 0
for item in items:
if max_title_width < len(item.title):
max_title_width = len(item.title)
frame = Rect(x=0, y=0, w=max_title_width+4, h=len(items)+2)
super(Menu, self).__init__(frame, title=None, delegate=None, can_become_first_responder=True)
self.selected_idx = 0
self.title = title
self.items = items
for (item_idx, item) in enumerate(items):
self.set_line(item_idx, item.title)
self.hide()
def update(self):
super(Menu, self).update()
def relinquish_first_responder(self):
if not self.hidden():
self.hide()
def perform_action(self):
selected_idx = self.get_selected_idx()
if selected_idx < len(self.items):
action = self.items[selected_idx].action
if action:
action()
class MenuBar(Panel):
def __init__(self, frame):
super(MenuBar, self).__init__(frame, can_become_first_responder=True)
self.menus = list()
self.selected_menu_idx = -1
self.add_key_action(curses.KEY_LEFT, self.select_prev, "Select the previous menu")
self.add_key_action(curses.KEY_RIGHT, self.select_next, "Select the next menu")
self.add_key_action(curses.KEY_DOWN, lambda: self.select(0), "Select the first menu")
self.add_key_action(27, self.relinquish_first_responder, "Hide current menu")
self.add_key_action(curses.KEY_ENTER, self.perform_action, "Select the next menu item")
self.add_key_action(10, self.perform_action, "Select the next menu item")
def insert_menu(self, menu, index=sys.maxsize):
if index >= len(self.menus):
self.menus.append(menu)
else:
self.menus.insert(index, menu)
pt = self.get_position()
for menu in self.menus:
menu.set_position(pt)
pt.x += len(menu.title) + 5
def perform_action(self):
'''If no menu is visible, show the first menu. If a menu is visible, perform the action
associated with the selected menu item in the menu'''
menu_visible = False
for menu in self.menus:
if not menu.hidden():
menu_visible = True
break
if menu_visible:
menu.perform_action()
self.selected_menu_idx = -1
self._selected_menu_changed()
else:
self.select(0)
def relinquish_first_responder(self):
if self.selected_menu_idx >= 0:
self.selected_menu_idx = -1
self._selected_menu_changed()
def _selected_menu_changed(self):
for (menu_idx, menu) in enumerate(self.menus):
is_hidden = menu.hidden()
if menu_idx != self.selected_menu_idx:
if not is_hidden:
if self.parent.pop_first_responder(menu) == False:
menu.hide()
for (menu_idx, menu) in enumerate(self.menus):
is_hidden = menu.hidden()
if menu_idx == self.selected_menu_idx:
if is_hidden:
menu.show()
self.parent.push_first_responder(menu)
menu.top()
self.parent.refresh()
def select(self, index):
if index < len(self.menus):
self.selected_menu_idx = index
self._selected_menu_changed()
def select_next (self):
num_menus = len(self.menus)
if self.selected_menu_idx == -1:
if num_menus > 0:
self.selected_menu_idx = 0
self._selected_menu_changed()
else:
if self.selected_menu_idx + 1 < num_menus:
self.selected_menu_idx += 1
else:
self.selected_menu_idx = -1
self._selected_menu_changed()
def select_prev (self):
num_menus = len(self.menus)
if self.selected_menu_idx == -1:
if num_menus > 0:
self.selected_menu_idx = num_menus - 1
self._selected_menu_changed()
else:
if self.selected_menu_idx - 1 >= 0:
self.selected_menu_idx -= 1
else:
self.selected_menu_idx = -1
self._selected_menu_changed()
def update(self):
self.erase()
is_in_first_responder_chain = self.is_in_first_responder_chain()
if is_in_first_responder_chain:
self.attron (curses.A_REVERSE)
pt = Point(x=0, y=0)
for menu in self.menus:
self.addstr(pt, '| ' + menu.title + ' ')
pt.x += len(menu.title) + 5
self.addstr(pt, '|')
width = self.get_size().w
while pt.x < width:
self.addch_at_point(pt, ' ')
pt.x += 1
if is_in_first_responder_chain:
self.attroff (curses.A_REVERSE)
for menu in self.menus:
menu.update()
class StatusPanel(Panel):
def __init__(self, frame):
super(StatusPanel, self).__init__(frame, delegate=None, can_become_first_responder=False)
self.status_items = list()
self.status_dicts = dict()
self.next_status_x = 1
def add_status_item(self, name, title, format, width, value, update=True):
status_item_dict = { 'name': name,
'title' : title,
'width' : width,
'format' : format,
'value' : value,
'x' : self.next_status_x }
index = len(self.status_items)
self.status_items.append(status_item_dict)
self.status_dicts[name] = index
self.next_status_x += width + 2;
if update:
self.update()
def increment_status(self, name, update=True):
if name in self.status_dicts:
status_item_idx = self.status_dicts[name]
status_item_dict = self.status_items[status_item_idx]
status_item_dict['value'] = status_item_dict['value'] + 1
if update:
self.update()
def update_status(self, name, value, update=True):
if name in self.status_dicts:
status_item_idx = self.status_dicts[name]
status_item_dict = self.status_items[status_item_idx]
status_item_dict['value'] = status_item_dict['format'] % (value)
if update:
self.update()
def update(self):
self.erase();
for status_item_dict in self.status_items:
self.addnstr_at_point(Point(x=status_item_dict['x'], y=0), '%s: %s' % (status_item_dict['title'], status_item_dict['value']), status_item_dict['width'])
stdscr = None
def intialize_curses():
global stdscr
stdscr = curses.initscr()
curses.noecho()
curses.cbreak()
stdscr.keypad(1)
try:
curses.start_color()
except:
pass
return Window(stdscr)
def terminate_curses():
global stdscr
if stdscr:
stdscr.keypad(0)
curses.echo()
curses.nocbreak()
curses.endwin()