"""
Copyright 2007-2011 Free Software Foundation, Inc.
This file is part of GNU Radio
GNU Radio Companion is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
GNU Radio Companion is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
"""
from __future__ import absolute_import
import functools
import ast
import random
from distutils.spawn import find_executable
from itertools import count
import six
from six.moves import filter
from gi.repository import GObject
from . import Actions, Colors, Utils, Bars, Dialogs
from .Element import Element
from .external_editor import ExternalEditor
from ..core.FlowGraph import FlowGraph as _Flowgraph
from ..core import Messages
class FlowGraph(Element, _Flowgraph):
"""
FlowGraph is the data structure to store graphical signal blocks,
graphical inputs and outputs,
and the connections between inputs and outputs.
"""
def __init__(self, **kwargs):
"""
FlowGraph constructor.
Create a list for signal blocks and connections. Connect mouse handlers.
"""
Element.__init__(self)
_Flowgraph.__init__(self, **kwargs)
# important vars dealing with mouse event tracking
self.element_moved = False
self.mouse_pressed = False
self.press_coor = (0, 0)
# selected
self.selected_elements = set()
self._old_selected_port = None
self._new_selected_port = None
# current mouse hover element
self.element_under_mouse = None
# context menu
self._context_menu = Bars.ContextMenu()
self.get_context_menu = lambda: self._context_menu
self._elements_to_draw = []
self._external_updaters = {}
def _get_unique_id(self, base_id=''):
"""
Get a unique id starting with the base id.
Args:
base_id: the id starts with this and appends a count
Returns:
a unique id
"""
block_ids = set(b.get_id() for b in self.blocks)
for index in count():
block_id = '{}_{}'.format(base_id, index)
if block_id not in block_ids:
break
return block_id
def install_external_editor(self, param):
target = (param.parent_block.get_id(), param.key)
if target in self._external_updaters:
editor = self._external_updaters[target]
else:
config = self.parent_platform.config
editor = (find_executable(config.editor) or
Dialogs.ChooseEditorDialog(config))
if not editor:
return
updater = functools.partial(
self.handle_external_editor_change, target=target)
editor = self._external_updaters[target] = ExternalEditor(
editor=editor,
name=target[0], value=param.get_value(),
callback=functools.partial(GObject.idle_add, updater)
)
editor.start()
try:
editor.open_editor()
except Exception as e:
# Problem launching the editor. Need to select a new editor.
Messages.send('>>> Error opening an external editor. Please select a different editor.\n')
# Reset the editor to force the user to select a new one.
self.parent_platform.config.editor = ''
def handle_external_editor_change(self, new_value, target):
try:
block_id, param_key = target
self.get_block(block_id).get_param(param_key).set_value(new_value)
except (IndexError, ValueError): # block no longer exists
self._external_updaters[target].stop()
del self._external_updaters[target]
return
Actions.EXTERNAL_UPDATE()
def add_new_block(self, key, coor=None):
"""
Add a block of the given key to this flow graph.
Args:
key: the block key
coor: an optional coordinate or None for random
"""
id = self._get_unique_id(key)
#calculate the position coordinate
h_adj = self.get_scroll_pane().get_hadjustment()
v_adj = self.get_scroll_pane().get_vadjustment()
if coor is None: coor = (
int(random.uniform(.25, .75)*h_adj.get_page_size() + h_adj.get_value()),
int(random.uniform(.25, .75)*v_adj.get_page_size() + v_adj.get_value()),
)
#get the new block
block = self.new_block(key)
block.coordinate = coor
block.get_param('id').set_value(id)
Actions.ELEMENT_CREATE()
return id
def make_connection(self):
"""this selection and the last were ports, try to connect them"""
if self._old_selected_port and self._new_selected_port:
try:
self.connect(self._old_selected_port, self._new_selected_port)
Actions.ELEMENT_CREATE()
except Exception as e:
Messages.send_fail_connection(e)
self._old_selected_port = None
self._new_selected_port = None
return True
return False
def update(self):
"""
Call the top level rewrite and validate.
Call the top level create labels and shapes.
"""
self.rewrite()
self.validate()
self.create_labels()
self.create_shapes()
def reload(self):
"""
Reload flow-graph (with updated blocks)
Args:
page: the page to reload (None means current)
Returns:
False if some error occurred during import
"""
success = False
data = self.export_data()
if data:
self.unselect()
success = self.import_data(data)
self.update()
return success
###########################################################################
# Access Drawing Area
###########################################################################
def get_drawing_area(self): return self.drawing_area
def queue_draw(self): self.get_drawing_area().queue_draw()
def get_scroll_pane(self): return self.drawing_area.get_parent().get_parent()
def get_ctrl_mask(self): return self.drawing_area.ctrl_mask
def get_mod1_mask(self): return self.drawing_area.mod1_mask
###########################################################################
# Copy Paste
###########################################################################
def copy_to_clipboard(self):
"""
Copy the selected blocks and connections into the clipboard.
Returns:
the clipboard
"""
#get selected blocks
blocks = list(self.selected_blocks())
if not blocks:
return None
#calc x and y min
x_min, y_min = blocks[0].coordinate
for block in blocks:
x, y = block.coordinate
x_min = min(x, x_min)
y_min = min(y, y_min)
#get connections between selected blocks
connections = list(filter(
lambda c: c.source_block in blocks and c.sink_block in blocks,
self.connections,
))
clipboard = (
(x_min, y_min),
[block.export_data() for block in blocks],
[connection.export_data() for connection in connections],
)
return clipboard
def paste_from_clipboard(self, clipboard):
"""
Paste the blocks and connections from the clipboard.
Args:
clipboard: the nested data of blocks, connections
"""
# todo: rewrite this...
selected = set()
(x_min, y_min), blocks_n, connections_n = clipboard
old_id2block = dict()
#recalc the position
h_adj = self.get_scroll_pane().get_hadjustment()
v_adj = self.get_scroll_pane().get_vadjustment()
x_off = h_adj.get_value() - x_min + h_adj.get_page_size() / 4
y_off = v_adj.get_value() - y_min + v_adj.get_page_size() / 4
if len(self.get_elements()) <= 1:
x_off, y_off = 0, 0
#create blocks
for block_n in blocks_n:
block_key = block_n.get('key')
if block_key == 'options':
continue
block = self.new_block(block_key)
if not block:
continue # unknown block was pasted (e.g. dummy block)
selected.add(block)
#set params
param_data = {n['key']: n['value'] for n in block_n.get('param', [])}
for key in block.states:
try:
block.states[key] = ast.literal_eval(param_data.pop(key))
except (KeyError, SyntaxError, ValueError):
pass
if block_key == 'epy_block':
block.get_param('_io_cache').set_value(param_data.pop('_io_cache'))
block.get_param('_source_code').set_value(param_data.pop('_source_code'))
block.rewrite() # this creates the other params
for param_key, param_value in six.iteritems(param_data):
#setup id parameter
if param_key == 'id':
old_id2block[param_value] = block
#if the block id is not unique, get a new block id
if param_value in (blk.get_id() for blk in self.blocks):
param_value = self._get_unique_id(param_value)
#set value to key
block.get_param(param_key).set_value(param_value)
#move block to offset coordinate
block.move((x_off, y_off))
#update before creating connections
self.update()
#create connections
for connection_n in connections_n:
source = old_id2block[connection_n.get('source_block_id')].get_source(connection_n.get('source_key'))
sink = old_id2block[connection_n.get('sink_block_id')].get_sink(connection_n.get('sink_key'))
self.connect(source, sink)
#set all pasted elements selected
for block in selected:
selected = selected.union(set(block.get_connections()))
self.selected_elements = set(selected)
###########################################################################
# Modify Selected
###########################################################################
def type_controller_modify_selected(self, direction):
"""
Change the registered type controller for the selected signal blocks.
Args:
direction: +1 or -1
Returns:
true for change
"""
return any(sb.type_controller_modify(direction) for sb in self.selected_blocks())
def port_controller_modify_selected(self, direction):
"""
Change port controller for the selected signal blocks.
Args:
direction: +1 or -1
Returns:
true for changed
"""
return any(sb.port_controller_modify(direction) for sb in self.selected_blocks())
def change_state_selected(self, new_state):
"""
Enable/disable the selected blocks.
Args:
new_state: a block state
Returns:
true if changed
"""
changed = False
for block in self.selected_blocks():
changed |= block.state != new_state
block.state = new_state
return changed
def move_selected(self, delta_coordinate):
"""
Move the element and by the change in coordinates.
Args:
delta_coordinate: the change in coordinates
"""
for selected_block in self.selected_blocks():
selected_block.move(delta_coordinate)
self.element_moved = True
def align_selected(self, calling_action=None):
"""
Align the selected blocks.
Args:
calling_action: the action initiating the alignment
Returns:
True if changed, otherwise False
"""
blocks = list(self.selected_blocks())
if calling_action is None or not blocks:
return False
# compute common boundary of selected objects
min_x, min_y = max_x, max_y = blocks[0].coordinate
for selected_block in blocks:
x, y = selected_block.coordinate
min_x, min_y = min(min_x, x), min(min_y, y)
x += selected_block.width
y += selected_block.height
max_x, max_y = max(max_x, x), max(max_y, y)
ctr_x, ctr_y = (max_x + min_x)/2, (max_y + min_y)/2
# align the blocks as requested
transform = {
Actions.BLOCK_VALIGN_TOP: lambda x, y, w, h: (x, min_y),
Actions.BLOCK_VALIGN_MIDDLE: lambda x, y, w, h: (x, ctr_y - h/2),
Actions.BLOCK_VALIGN_BOTTOM: lambda x, y, w, h: (x, max_y - h),
Actions.BLOCK_HALIGN_LEFT: lambda x, y, w, h: (min_x, y),
Actions.BLOCK_HALIGN_CENTER: lambda x, y, w, h: (ctr_x-w/2, y),
Actions.BLOCK_HALIGN_RIGHT: lambda x, y, w, h: (max_x - w, y),
}.get(calling_action, lambda *args: args)
for selected_block in blocks:
x, y = selected_block.coordinate
w, h = selected_block.width, selected_block.height
selected_block.coordinate = transform(x, y, w, h)
return True
def rotate_selected(self, rotation):
"""
Rotate the selected blocks by multiples of 90 degrees.
Args:
rotation: the rotation in degrees
Returns:
true if changed, otherwise false.
"""
if not any(self.selected_blocks()):
return False
#initialize min and max coordinates
min_x, min_y = max_x, max_y = self.selected_block.coordinate
# rotate each selected block, and find min/max coordinate
for selected_block in self.selected_blocks():
selected_block.rotate(rotation)
#update the min/max coordinate
x, y = selected_block.coordinate
min_x, min_y = min(min_x, x), min(min_y, y)
max_x, max_y = max(max_x, x), max(max_y, y)
#calculate center point of slected blocks
ctr_x, ctr_y = (max_x + min_x)/2, (max_y + min_y)/2
#rotate the blocks around the center point
for selected_block in self.selected_blocks():
x, y = selected_block.coordinate
x, y = Utils.get_rotated_coordinate((x - ctr_x, y - ctr_y), rotation)
selected_block.coordinate = (x + ctr_x, y + ctr_y)
return True
def remove_selected(self):
"""
Remove selected elements
Returns:
true if changed.
"""
changed = False
for selected_element in self.selected_elements:
self.remove_element(selected_element)
changed = True
return changed
def update_selected(self):
"""
Remove deleted elements from the selected elements list.
Update highlighting so only the selected are highlighted.
"""
selected_elements = self.selected_elements
elements = self.get_elements()
# remove deleted elements
for selected in list(selected_elements):
if selected in elements:
continue
selected_elements.remove(selected)
if self._old_selected_port and self._old_selected_port.parent not in elements:
self._old_selected_port = None
if self._new_selected_port and self._new_selected_port.parent not in elements:
self._new_selected_port = None
# update highlighting
for element in elements:
element.highlighted = element in selected_elements
###########################################################################
# Draw stuff
###########################################################################
def update_elements_to_draw(self):
hide_disabled_blocks = Actions.TOGGLE_HIDE_DISABLED_BLOCKS.get_active()
hide_variables = Actions.TOGGLE_HIDE_VARIABLES.get_active()
def draw_order(elem):
return elem.highlighted, elem.is_block, elem.enabled
elements = sorted(self.get_elements(), key=draw_order)
del self._elements_to_draw[:]
for element in elements:
if hide_disabled_blocks and not element.enabled:
continue # skip hidden disabled blocks and connections
if hide_variables and (element.is_variable or element.is_import):
continue # skip hidden disabled blocks and connections
self._elements_to_draw.append(element)
def _drawables(self):
show_comments = Actions.TOGGLE_SHOW_BLOCK_COMMENTS.get_active()
for element in self._elements_to_draw:
if element.is_block and show_comments and element.enabled:
yield element.draw_comment
for element in self._elements_to_draw:
yield element.draw
def draw(self, widget, cr):
"""Draw blocks connections comment and select rectangle"""
# todo: only update if required, duplicate logic in
self.update_elements_to_draw()
for draw_element in self._drawables():
cr.save()
draw_element(widget, cr)
cr.restore()
# draw multi select rectangle
if self.mouse_pressed and (not self.selected_elements or self.get_ctrl_mask()):
x1, y1 = self.press_coor
x2, y2 = self.coordinate
x, y = int(min(x1, x2)), int(min(y1, y2))
w, h = int(abs(x1 - x2)), int(abs(y1 - y2))
cr.set_source_rgba(
Colors.HIGHLIGHT_COLOR[0],
Colors.HIGHLIGHT_COLOR[1],
Colors.HIGHLIGHT_COLOR[2],
0.5,
)
cr.rectangle(x, y, w, h)
cr.fill()
cr.rectangle(x, y, w, h)
cr.stroke()
##########################################################################
# selection handling
##########################################################################
def update_selected_elements(self):
"""
Update the selected elements.
The update behavior depends on the state of the mouse button.
When the mouse button pressed the selection will change when
the control mask is set or the new selection is not in the current group.
When the mouse button is released the selection will change when
the mouse has moved and the control mask is set or the current group is empty.
Attempt to make a new connection if the old and ports are filled.
If the control mask is set, merge with the current elements.
"""
selected_elements = None
if self.mouse_pressed:
new_selections = self.what_is_selected(self.coordinate)
# update the selections if the new selection is not in the current selections
# allows us to move entire selected groups of elements
if self.get_ctrl_mask() or new_selections not in self.selected_elements:
selected_elements = new_selections
if self._old_selected_port:
self._old_selected_port.force_show_label = False
self.create_shapes()
self.queue_draw()
elif self._new_selected_port:
self._new_selected_port.force_show_label = True
else: # called from a mouse release
if not self.element_moved and (not self.selected_elements or self.get_ctrl_mask()):
selected_elements = self.what_is_selected(self.coordinate, self.press_coor)
# this selection and the last were ports, try to connect them
if self.make_connection():
return
# update selected elements
if selected_elements is None:
return
# if ctrl, set the selected elements to the union - intersection of old and new
if self.get_ctrl_mask():
self.selected_elements ^= selected_elements
else:
self.selected_elements.clear()
self.selected_elements.update(selected_elements)
Actions.ELEMENT_SELECT()
def what_is_selected(self, coor, coor_m=None):
"""
What is selected?
At the given coordinate, return the elements found to be selected.
If coor_m is unspecified, return a list of only the first element found to be selected:
Iterate though the elements backwards since top elements are at the end of the list.
If an element is selected, place it at the end of the list so that is is drawn last,
and hence on top. Update the selected port information.
Args:
coor: the coordinate of the mouse click
coor_m: the coordinate for multi select
Returns:
the selected blocks and connections or an empty list
"""
selected_port = None
selected = set()
# check the elements
for element in reversed(self._elements_to_draw):
selected_element = element.what_is_selected(coor, coor_m)
if not selected_element:
continue
# update the selected port information
if selected_element.is_port:
if not coor_m:
selected_port = selected_element
selected_element = selected_element.parent_block
selected.add(selected_element)
if not coor_m:
break
# update selected ports
if selected_port is not self._new_selected_port:
self._old_selected_port = self._new_selected_port
self._new_selected_port = selected_port
return selected
def unselect(self):
"""
Set selected elements to an empty set.
"""
self.selected_elements.clear()
def select_all(self):
"""Select all blocks in the flow graph"""
self.selected_elements.clear()
self.selected_elements.update(self._elements_to_draw)
def selected_blocks(self):
"""
Get a group of selected blocks.
Returns:
sub set of blocks in this flow graph
"""
return (e for e in self.selected_elements if e.is_block)
@property
def selected_block(self):
"""
Get the selected block when a block or port is selected.
Returns:
a block or None
"""
return next(self.selected_blocks(), None)
def get_selected_elements(self):
"""
Get the group of selected elements.
Returns:
sub set of elements in this flow graph
"""
return self.selected_elements
def get_selected_element(self):
"""
Get the selected element.
Returns:
a block, port, or connection or None
"""
return next(iter(self.selected_elements), None)
##########################################################################
# Event Handlers
##########################################################################
def handle_mouse_context_press(self, coordinate, event):
"""
The context mouse button was pressed:
If no elements were selected, perform re-selection at this coordinate.
Then, show the context menu at the mouse click location.
"""
selections = self.what_is_selected(coordinate)
if not selections.intersection(self.selected_elements):
self.coordinate = coordinate
self.mouse_pressed = True
self.update_selected_elements()
self.mouse_pressed = False
self._context_menu.popup(None, None, None, None, event.button, event.time)
def handle_mouse_selector_press(self, double_click, coordinate):
"""
The selector mouse button was pressed:
Find the selected element. Attempt a new connection if possible.
Open the block params window on a double click.
Update the selection state of the flow graph.
"""
self.press_coor = coordinate
self.coordinate = coordinate
self.mouse_pressed = True
if double_click:
self.unselect()
self.update_selected_elements()
if double_click and self.selected_block:
self.mouse_pressed = False
Actions.BLOCK_PARAM_MODIFY()
def handle_mouse_selector_release(self, coordinate):
"""
The selector mouse button was released:
Update the state, handle motion (dragging).
And update the selected flowgraph elements.
"""
self.coordinate = coordinate
self.mouse_pressed = False
if self.element_moved:
Actions.BLOCK_MOVE()
self.element_moved = False
self.update_selected_elements()
def handle_mouse_motion(self, coordinate, button1_pressed):
"""
The mouse has moved, respond to mouse dragging or notify elements
Move a selected element to the new coordinate.
Auto-scroll the scroll bars at the boundaries.
"""
# to perform a movement, the mouse must be pressed
# (no longer checking pending events via Gtk.events_pending() - always true in Windows)
if not button1_pressed:
self._handle_mouse_motion_move(coordinate)
else:
self._handle_mouse_motion_drag(coordinate)
def _handle_mouse_motion_move(self, coordinate):
# only continue if mouse-over stuff is enabled (just the auto-hide port label stuff for now)
if not Actions.TOGGLE_AUTO_HIDE_PORT_LABELS.get_active():
return
redraw = False
for element in self._elements_to_draw:
over_element = element.what_is_selected(coordinate)
if not over_element:
continue
if over_element != self.element_under_mouse: # over sth new
if self.element_under_mouse:
redraw |= self.element_under_mouse.mouse_out() or False
self.element_under_mouse = over_element
redraw |= over_element.mouse_over() or False
break
else:
if self.element_under_mouse:
redraw |= self.element_under_mouse.mouse_out() or False
self.element_under_mouse = None
if redraw:
# self.create_labels()
self.create_shapes()
self.queue_draw()
def _handle_mouse_motion_drag(self, coordinate):
# remove the connection if selected in drag event
if len(self.selected_elements) == 1 and self.get_selected_element().is_connection:
Actions.ELEMENT_DELETE()
# move the selected elements and record the new coordinate
x, y = coordinate
if not self.get_ctrl_mask():
X, Y = self.coordinate
dX, dY = int(x - X), int(y - Y)
active = Actions.TOGGLE_SNAP_TO_GRID.get_active() or self.get_mod1_mask()
if not active or abs(dX) >= Utils.CANVAS_GRID_SIZE or abs(dY) >= Utils.CANVAS_GRID_SIZE:
self.move_selected((dX, dY))
self.coordinate = (x, y)
# queue draw for animation
self.queue_draw()
def get_max_coords(self, initial=(0, 0)):
w, h = initial
for block in self.blocks:
x, y = block.coordinate
w = max(w, x + block.width)
h = max(h, y + block.height)
return w, h