Modbus plugin: provide user programs feedback on current connection status mapped onto a WORD located variable
#!/usr/bin/env python
# -*- coding: utf-8 -*-
# This file is part of Beremiz, a Integrated Development Environment for
# programming IEC 61131-3 automates supporting plcopen standard and CanFestival.
#
# Copyright (C) 2007: Edouard TISSERANT and Laurent BESSARD
#
# See COPYING file for copyrights details.
#
# This program 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.
#
# This program 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
from functools import reduce
import wx
# -------------------------------------------------------------------------------
# Helpers
# -------------------------------------------------------------------------------
[CATEGORY, BLOCK] = range(2)
# -------------------------------------------------------------------------------
# Library Panel
# -------------------------------------------------------------------------------
class LibraryPanel(wx.Panel):
"""
Class that implements a panel displaying a tree containing an hierarchical list
of functions and function blocks available in project an a search control for
quickly find one functions or function blocks in this list and a text control
displaying informations about selected functions or function blocks
"""
def __init__(self, parent, enable_drag=False):
"""
Constructor
@param parent: Parent wx.Window of LibraryPanel
@param enable_drag: Flag indicating that function or function block can
be drag'n drop from LibraryPanel (default: False)
"""
wx.Panel.__init__(self, parent, style=wx.TAB_TRAVERSAL)
# Define LibraryPanel main sizer
main_sizer = wx.FlexGridSizer(cols=1, hgap=0, rows=2, vgap=0)
main_sizer.AddGrowableCol(0)
main_sizer.AddGrowableRow(1)
# Add SearchCtrl to main sizer
self.SearchCtrl = wx.SearchCtrl(self)
# Add a button with a magnifying glass, essentially to show that this
# control is for searching in tree
self.SearchCtrl.ShowSearchButton(True)
self.Bind(wx.EVT_TEXT, self.OnSearchCtrlChanged, self.SearchCtrl)
self.Bind(wx.EVT_SEARCHCTRL_SEARCH_BTN,
self.OnSearchButtonClick, self.SearchCtrl)
# Bind keyboard event on SearchCtrl text control to catch UP and DOWN
# for search previous and next occurrence
# This protects from fail to start when no children[0] available (possible for wxPython 3.0)
if self.SearchCtrl.GetChildren():
search_textctrl = self.SearchCtrl.GetChildren()[0]
search_textctrl.Bind(wx.EVT_CHAR, self.OnKeyDown)
main_sizer.AddWindow(self.SearchCtrl, flag=wx.GROW)
# Add Splitter window for tree and block comment to main sizer
splitter_window = wx.SplitterWindow(self)
splitter_window.SetSashGravity(1.0)
main_sizer.AddWindow(splitter_window, flag=wx.GROW)
# Add TreeCtrl for functions and function blocks library in splitter
# window
self.Tree = wx.TreeCtrl(splitter_window,
size=wx.Size(0, 0),
style=(wx.TR_HAS_BUTTONS |
wx.TR_SINGLE |
wx.SUNKEN_BORDER |
wx.TR_HIDE_ROOT |
wx.TR_LINES_AT_ROOT))
self.Bind(wx.EVT_TREE_SEL_CHANGED, self.OnTreeItemSelected, self.Tree)
self.Tree.Bind(wx.EVT_CHAR, self.OnKeyDown)
# If drag'n drop is enabled, bind event generated when a drag begins on
# tree to start a drag'n drop
if enable_drag:
self.Bind(wx.EVT_TREE_BEGIN_DRAG, self.OnTreeBeginDrag, self.Tree)
# Add TextCtrl for function and function block informations
self.Comment = wx.TextCtrl(splitter_window, size=wx.Size(0, 80),
style=wx.TE_READONLY | wx.TE_MULTILINE)
splitter_window.SplitHorizontally(self.Tree, self.Comment, -80)
self.SetSizer(main_sizer)
# Reference to the project controller
self.Controller = None
# Variable storing functions and function blocks library to display
self.BlockList = None
def __del__(self):
"""
Destructor
"""
# Remove reference to project controller
self.Controller = None
def SetController(self, controller):
"""
Set reference to project controller
@param controller: Reference to project controller
"""
self.Controller = controller
def SetBlockList(self, blocklist):
"""
Set function and function block library to display in TreeCtrl
@param blocklist: Function and function block library
"""
# Save functions and function blocks library
self.BlockList = blocklist
# Refresh TreeCtrl values
self.RefreshTree()
def SetFocus(self):
"""
Called to give focus to LibraryPanel
Override wx.Window SetFocus method
"""
# Give focus to SearchCtrl
self.SearchCtrl.SetFocus()
def ResetTree(self):
"""
Reset LibraryPanel values displayed in controls
"""
# Clear SearchCtrl, TreeCtrl and TextCtrl
self.SearchCtrl.SetValue("")
self.Tree.DeleteAllItems()
self.Comment.SetValue("")
def RefreshTree(self):
"""
Refresh LibraryPanel values displayed in controls
"""
# Get function and function blocks library
blocktypes = self.BlockList
if blocktypes is None and self.Controller is not None:
# Get library from project controller if not defined
blocktypes = self.Controller.GetBlockTypes()
# Refresh TreeCtrl values if a library is defined
if blocktypes is not None:
# List that will contain tree items to be deleted when TreeCtrl
# will be refreshed
items_to_delete = []
# Get current selected item for selected it when values refreshed
selected_item = self.Tree.GetSelection()
selected_pydata = (self.Tree.GetPyData(selected_item)
if (selected_item.IsOk() and
selected_item != self.Tree.GetRootItem())
else None)
# Don't save selected item if it is a category
selected_infos = ((self.Tree.GetItemText(selected_item),
selected_pydata["inputs"])
if (selected_pydata is not None and
selected_pydata["type"] == BLOCK)
else (None, None))
# Get TreeCtrl root item (hidden)
root = self.Tree.GetRootItem()
if not root.IsOk():
# Create root if not present
root = self.Tree.AddRoot("")
# Iterate over functions and function blocks library categories and
# add a tree item to root item for each of them
# Get first child under root item
category_item, root_cookie = self.Tree.GetFirstChild(root)
for category in blocktypes:
# Store category name in a local variable to prevent script
# extracting translated strings for gettext to consider "name"
# to be translated
category_name = category["name"]
# Tree item already exists, set item label
if category_item.IsOk():
self.Tree.SetItemText(category_item, _(category_name))
# Tree item doesn't exist, add new one to root
else:
category_item = self.Tree.AppendItem(root, _(category_name))
# On Windows, needs to get next child of root to have a
# reference to the newly added tree item
if wx.Platform != '__WXMSW__':
category_item, root_cookie = \
self.Tree.GetNextChild(root, root_cookie)
# Set data associated to tree item (only save that item is a
# category)
self.Tree.SetPyData(category_item, {"type": CATEGORY})
# Iterate over functions and function blocks defined in library
# category add a tree item to category tree item for each of
# them
# Get first child under category tree item
blocktype_item, category_cookie = \
self.Tree.GetFirstChild(category_item)
for blocktype in category["list"]:
# Tree item already exists, set item label
if blocktype_item.IsOk():
self.Tree.SetItemText(blocktype_item, blocktype["name"])
# Tree item doesn't exist, add new one to category item
else:
blocktype_item = self.Tree.AppendItem(
category_item, blocktype["name"])
# See comment when adding category
if wx.Platform != '__WXMSW__':
blocktype_item, category_cookie = \
self.Tree.GetNextChild(category_item,
category_cookie)
# Define data to associate to block tree item
comment = blocktype["comment"]
block_data = {
"type": BLOCK,
"block_type": blocktype["type"],
"inputs": tuple([type
for _name, type, _modifier
in blocktype["inputs"]]),
"extension": (len(blocktype["inputs"])
if blocktype["extensible"] else None),
"comment": _(comment) + blocktype.get("usage", "")
}
self.Tree.SetPyData(blocktype_item, block_data)
# Select block tree item in tree if it corresponds to
# previously selected one
if selected_infos == (blocktype["name"],
blocktype["inputs"]):
self.Tree.SelectItem(blocktype_item)
# Update TextCtrl value
self.Comment.SetValue(block_data["comment"])
# Get next block tree item under category tree item
blocktype_item, category_cookie = \
self.Tree.GetNextChild(category_item, category_cookie)
# Add every remaining tree item under category tree item after
# updating all block items to the list of items to delete
while blocktype_item.IsOk():
items_to_delete.append(blocktype_item)
blocktype_item, category_cookie = \
self.Tree.GetNextChild(category_item, category_cookie)
# Get next category tree item under root item
category_item, root_cookie = \
self.Tree.GetNextChild(root, root_cookie)
# Add every remaining tree item under root item after updating all
# category items to the list of items to delete
while category_item.IsOk():
items_to_delete.append(category_item)
category_item, root_cookie = \
self.Tree.GetNextChild(root, root_cookie)
# Remove all items in list of items to delete from TreeCtrl
for item in items_to_delete:
self.Tree.Delete(item)
def GetSelectedBlock(self):
"""
Get selected block informations
@return: {"type": block_type_name, "inputs": [input_type,...]} or None
if no block selected
"""
# Get selected item associated data in tree
selected_item = self.Tree.GetSelection()
selected_pydata = (self.Tree.GetPyData(selected_item)
if (selected_item.IsOk() and
selected_item != self.Tree.GetRootItem())
else None)
# Return value is None if selected tree item is root or a category
return ({"type": self.Tree.GetItemText(selected_item),
"inputs": selected_pydata["inputs"]}
if (selected_pydata is not None and
selected_pydata["type"] == BLOCK)
else None)
def SelectTreeItem(self, name, inputs):
"""
Select Tree item corresponding to block informations given
@param name: Block type name
@param inputs: List of block inputs type [input_type,...]
"""
# Find tree item corresponding to block informations
item = self.FindTreeItem(self.Tree.GetRootItem(), name, inputs)
if item is not None and item.IsOk():
# Select tree item found
self.Tree.SelectItem(item)
self.Tree.EnsureVisible(item)
def FindTreeItem(self, item, name, inputs=None):
"""
Find Tree item corresponding to block informations given
Function is recursive
@param item: Item to test
@param name: Block type name
@param inputs: List of block inputs type [input_type,...]
"""
# Return immediately if item isn't valid
if not item.IsOk():
return None
# Get data associated to item to test
item_pydata = self.Tree.GetPyData(item)
if item_pydata is not None and item_pydata["type"] == BLOCK:
# Only test item corresponding to block
# Test if block inputs type are the same than those given
type_inputs = item_pydata.get("inputs", None)
type_extension = item_pydata.get("extension", None)
if inputs is not None and type_inputs is not None:
same_inputs = reduce(
lambda x, y: x and y,
map(
lambda x: x[0] == x[1] or x[0] == 'ANY' or x[1] == 'ANY',
zip(type_inputs,
(inputs[:type_extension]
if type_extension is not None
else inputs))),
True)
else:
same_inputs = True
# Return item if block data corresponds to informations given
if self.Tree.GetItemText(item) == name and same_inputs:
return item
# Test item children if item doesn't correspond
child, child_cookie = self.Tree.GetFirstChild(item)
while child.IsOk():
result = self.FindTreeItem(child, name, inputs)
if result:
return result
child, child_cookie = self.Tree.GetNextChild(item, child_cookie)
return None
def SearchInTree(self, value, mode="first"):
"""
Search in Tree and select item that name contains string given
@param value: String contained in block name to find
@param mode: Search mode ('first', 'previous' or 'next')
(default: 'first')
@return: True if an item was found
"""
# Return immediately if root isn't valid
root = self.Tree.GetRootItem()
if not root.IsOk():
return False
# Set function to navigate in Tree item sibling according to search
# mode defined
sibling_function = (self.Tree.GetPrevSibling
if mode == "previous"
else self.Tree.GetNextSibling)
# Get current selected item (for next and previous mode)
item = self.Tree.GetSelection()
if not item.IsOk() or mode == "first":
item, _item_cookie = self.Tree.GetFirstChild(root)
selected = None
else:
selected = item
# Navigate through tree items until one matching found or reach tree
# starting or ending
while item.IsOk():
# Get item data to get item type
item_pydata = self.Tree.GetPyData(item)
# Item is a block category
if (item == root) or item_pydata["type"] == CATEGORY:
# Get category first or last child according to search mode
# defined
child = (self.Tree.GetLastChild(item)
if mode == "previous"
else self.Tree.GetFirstChild(item)[0])
# If category has no child, go to sibling category
item = (child if child.IsOk() else sibling_function(item))
# Item is a block
else:
# Extract item block name
name = self.Tree.GetItemText(item)
# Test if block name contains string given
if name.upper().find(value.upper()) != -1 and item != selected:
# Select block and collapse all categories other than block
# category
child, child_cookie = self.Tree.GetFirstChild(root)
while child.IsOk():
self.Tree.CollapseAllChildren(child)
child, child_cookie = self.Tree.GetNextChild(root, child_cookie)
self.Tree.SelectItem(item)
self.Tree.EnsureVisible(item)
return True
# Go to next item sibling if block not found
next = sibling_function(item)
# If category has no other child, go to next category sibling
item = (next
if next.IsOk()
else sibling_function(self.Tree.GetItemParent(item)))
return False
def OnSearchCtrlChanged(self, event):
"""
Called when SearchCtrl text control value changed
@param event: TextCtrl change event
"""
# Search for block containing SearchCtrl value in 'first' mode
self.SearchInTree(self.SearchCtrl.GetValue())
event.Skip()
def OnSearchButtonClick(self, event):
"""
Called when SearchCtrl search button was clicked
@param event: Button clicked event
"""
# Search for block containing SearchCtrl value in 'next' mode
self.SearchInTree(self.SearchCtrl.GetValue(), "next")
event.Skip()
def OnTreeItemSelected(self, event):
"""
Called when tree item is selected
@param event: wx.TreeEvent
"""
# Update TextCtrl value with block selected usage
item_pydata = self.Tree.GetPyData(event.GetItem())
self.Comment.SetValue(
item_pydata["comment"]
if item_pydata is not None and item_pydata["type"] == BLOCK
else "")
# Call extra function defined when tree item is selected
if getattr(self, "_OnTreeItemSelected", None) is not None:
self._OnTreeItemSelected(event)
event.Skip()
def OnTreeBeginDrag(self, event):
"""
Called when a drag is started in tree
@param event: wx.TreeEvent
"""
selected_item = event.GetItem()
item_pydata = self.Tree.GetPyData(selected_item)
# Item dragged is a block
if item_pydata is not None and item_pydata["type"] == BLOCK:
# Start a drag'n drop
data = wx.TextDataObject(str(
(self.Tree.GetItemText(selected_item),
item_pydata["block_type"],
"",
item_pydata["inputs"])))
dragSource = wx.DropSource(self.Tree)
dragSource.SetData(data)
dragSource.DoDragDrop()
def OnKeyDown(self, event):
"""
Called when key is pressed in SearchCtrl text control
@param event: wx.KeyEvent
"""
# Get event keycode and value in SearchCtrl
keycode = event.GetKeyCode()
search_value = self.SearchCtrl.GetValue()
# Up key was pressed and SearchCtrl isn't empty, search for block in
# 'previous' mode
if keycode == wx.WXK_UP and search_value != "":
self.SearchInTree(search_value, "previous")
# Down key was pressed and SearchCtrl isn't empty, search for block in
# 'next' mode
elif keycode == wx.WXK_DOWN and search_value != "":
self.SearchInTree(search_value, "next")
# Handle key normally
else:
event.Skip()