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#!/usr/bin/env python

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# -*- coding: utf-8 -*-

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# This file is part of Beremiz, a Integrated Development Environment for

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# programming IEC 61131-3 automates supporting plcopen standard and CanFestival.

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#

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# Copyright (C) 2007: Edouard TISSERANT and Laurent BESSARD

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#

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# See COPYING file for copyrights details.

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#

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# This program is free software; you can redistribute it and/or

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# modify it under the terms of the GNU General Public License

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# as published by the Free Software Foundation; either version 2

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# of the License, or (at your option) any later version.

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#

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# This program is distributed in the hope that it will be useful,

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# but WITHOUT ANY WARRANTY; without even the implied warranty of

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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

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# GNU General Public License for more details.

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#

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# You should have received a copy of the GNU General Public License

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# along with this program; if not, write to the Free Software

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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

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from __future__ import absolute_import

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import wx

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# -------------------------------------------------------------------------------

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#                                 Helpers

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# -------------------------------------------------------------------------------

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[CATEGORY, BLOCK] = range(2)

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# -------------------------------------------------------------------------------

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#                              Library Panel

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# -------------------------------------------------------------------------------

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class LibraryPanel(wx.Panel):

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    """

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    Class that implements a panel displaying a tree containing an hierarchical list

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    of functions and function blocks available in project an a search control for

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    quickly find one functions or function blocks in this list and a text control

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    displaying informations about selected functions or function blocks

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    """

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    def __init__(self, parent, enable_drag=False):

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        """

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        Constructor

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        @param parent: Parent wx.Window of LibraryPanel

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        @param enable_drag: Flag indicating that function or function block can

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        be drag'n drop from LibraryPanel (default: False)

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        """

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        wx.Panel.__init__(self, parent, style=wx.TAB_TRAVERSAL)

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        # Define LibraryPanel main sizer

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        main_sizer = wx.FlexGridSizer(cols=1, hgap=0, rows=2, vgap=0)

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        main_sizer.AddGrowableCol(0)

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        main_sizer.AddGrowableRow(1)

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        # Add SearchCtrl to main sizer

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        self.SearchCtrl = wx.SearchCtrl(self)

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        # Add a button with a magnifying glass, essentially to show that this

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        # control is for searching in tree

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        self.SearchCtrl.ShowSearchButton(True)

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        self.Bind(wx.EVT_TEXT, self.OnSearchCtrlChanged, self.SearchCtrl)

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        self.Bind(wx.EVT_SEARCHCTRL_SEARCH_BTN,

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                  self.OnSearchButtonClick, self.SearchCtrl)

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        # Bind keyboard event on SearchCtrl text control to catch UP and DOWN

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        # for search previous and next occurrence

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        # This protects from fail to start when no children[0] available (possible for wxPython 3.0)

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        if self.SearchCtrl.GetChildren():

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            search_textctrl = self.SearchCtrl.GetChildren()[0]

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            search_textctrl.Bind(wx.EVT_CHAR, self.OnKeyDown)

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        main_sizer.AddWindow(self.SearchCtrl, flag=wx.GROW)

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        # Add Splitter window for tree and block comment to main sizer

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        splitter_window = wx.SplitterWindow(self)

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        splitter_window.SetSashGravity(1.0)

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        main_sizer.AddWindow(splitter_window, flag=wx.GROW)

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        # Add TreeCtrl for functions and function blocks library in splitter

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        # window

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        self.Tree = wx.TreeCtrl(splitter_window,

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                                size=wx.Size(0, 0),

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                                style=(wx.TR_HAS_BUTTONS |

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                                       wx.TR_SINGLE |

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                                       wx.SUNKEN_BORDER |

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                                       wx.TR_HIDE_ROOT |

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                                       wx.TR_LINES_AT_ROOT))

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        self.Bind(wx.EVT_TREE_SEL_CHANGED, self.OnTreeItemSelected, self.Tree)

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        self.Tree.Bind(wx.EVT_CHAR, self.OnKeyDown)

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        # If drag'n drop is enabled, bind event generated when a drag begins on

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        # tree to start a drag'n drop

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        if enable_drag:

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            self.Bind(wx.EVT_TREE_BEGIN_DRAG, self.OnTreeBeginDrag, self.Tree)

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        # Add TextCtrl for function and function block informations

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        self.Comment = wx.TextCtrl(splitter_window, size=wx.Size(0, 80),

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                                   style=wx.TE_READONLY | wx.TE_MULTILINE)

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        splitter_window.SplitHorizontally(self.Tree, self.Comment, -80)

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        self.SetSizer(main_sizer)

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   110

        # Reference to the project controller

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        self.Controller = None

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        # Variable storing functions and function blocks library to display

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        self.BlockList = None

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    def __del__(self):

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        """

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        Destructor

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        """

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        # Remove reference to project controller

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        self.Controller = None

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   123

    def SetController(self, controller):

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        """

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        Set reference to project controller

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        @param controller: Reference to project controller

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        """

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        self.Controller = controller

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    def SetBlockList(self, blocklist):

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        """

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        Set function and function block library to display in TreeCtrl

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        @param blocklist: Function and function block library

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        """

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        # Save functions and function blocks library

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        self.BlockList = blocklist

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        # Refresh TreeCtrl values

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        self.RefreshTree()

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    def SetFocus(self):

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        """

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        Called to give focus to LibraryPanel

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        Override wx.Window SetFocus method

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        """

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        # Give focus to SearchCtrl

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        self.SearchCtrl.SetFocus()

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    def ResetTree(self):

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        """

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        Reset LibraryPanel values displayed in controls

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        """

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        # Clear SearchCtrl, TreeCtrl and TextCtrl

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        self.SearchCtrl.SetValue("")

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        self.Tree.DeleteAllItems()

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        self.Comment.SetValue("")

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    def RefreshTree(self):

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        """

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        Refresh LibraryPanel values displayed in controls

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        """

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        # Get function and function blocks library

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        blocktypes = self.BlockList

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        if blocktypes is None and self.Controller is not None:

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            # Get library from project controller if not defined

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            blocktypes = self.Controller.GetBlockTypes()

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        # Refresh TreeCtrl values if a library is defined

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        if blocktypes is not None:

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            # List that will contain tree items to be deleted when TreeCtrl

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            # will be refreshed

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            items_to_delete = []

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            # Get current selected item for selected it when values refreshed

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            selected_item = self.Tree.GetSelection()

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            selected_pydata = (self.Tree.GetPyData(selected_item)

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                               if (selected_item.IsOk() and

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                                   selected_item != self.Tree.GetRootItem())

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                               else None)

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            # Don't save selected item if it is a category

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            selected_infos = ((self.Tree.GetItemText(selected_item),

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                               selected_pydata["inputs"])

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                              if (selected_pydata is not None and

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                                  selected_pydata["type"] == BLOCK)

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                              else (None, None))

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            # Get TreeCtrl root item (hidden)

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            root = self.Tree.GetRootItem()

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            if not root.IsOk():

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                # Create root if not present

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                root = self.Tree.AddRoot("")

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            # Iterate over functions and function blocks library categories and

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            # add a tree item to root item for each of them

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            # Get first child under root item

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            category_item, root_cookie = self.Tree.GetFirstChild(root)

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            for category in blocktypes:

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                # Store category name in a local variable to prevent script

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                # extracting translated strings for gettext to consider "name"

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                # to be translated

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                category_name = category["name"]

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                # Tree item already exists, set item label

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                if category_item.IsOk():

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                    self.Tree.SetItemText(category_item, _(category_name))

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                # Tree item doesn't exist, add new one to root

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                else:

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                    category_item = self.Tree.AppendItem(root, _(category_name))

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                    # On Windows, needs to get next child of root to have a

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                    # reference to the newly added tree item

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                    if wx.Platform != '__WXMSW__':

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                        category_item, root_cookie = \

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                            self.Tree.GetNextChild(root, root_cookie)

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                # Set data associated to tree item (only save that item is a

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                # category)

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                self.Tree.SetPyData(category_item, {"type": CATEGORY})

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                # Iterate over functions and function blocks defined in library

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                # category add a tree item to category tree item for each of

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                # them

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                # Get first child under category tree item

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                blocktype_item, category_cookie = \

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                    self.Tree.GetFirstChild(category_item)

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                for blocktype in category["list"]:

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                    # Tree item already exists, set item label

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                    if blocktype_item.IsOk():

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                        self.Tree.SetItemText(blocktype_item, blocktype["name"])

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                    # Tree item doesn't exist, add new one to category item

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                    else:

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                        blocktype_item = self.Tree.AppendItem(

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                            category_item, blocktype["name"])

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                        # See comment when adding category

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                        if wx.Platform != '__WXMSW__':

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                            blocktype_item, category_cookie = \

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                                self.Tree.GetNextChild(category_item,

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                                                       category_cookie)

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                    # Define data to associate to block tree item

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                    comment = blocktype["comment"]

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                    block_data = {

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                        "type":       BLOCK,

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                        "block_type": blocktype["type"],

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                        "inputs":     tuple([type

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                                             for _name, type, _modifier

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                                             in blocktype["inputs"]]),

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                        "extension":  (len(blocktype["inputs"])

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                                       if blocktype["extensible"] else None),

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                        "comment":    _(comment) + blocktype.get("usage", "")

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                    }

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                    self.Tree.SetPyData(blocktype_item, block_data)

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                    # Select block tree item in tree if it corresponds to

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                    # previously selected one

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                    if selected_infos == (blocktype["name"],

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                                          blocktype["inputs"]):

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                        self.Tree.SelectItem(blocktype_item)

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                        # Update TextCtrl value

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                        self.Comment.SetValue(block_data["comment"])

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                    # Get next block tree item under category tree item

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                    blocktype_item, category_cookie = \

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                        self.Tree.GetNextChild(category_item, category_cookie)

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                # Add every remaining tree item under category tree item after

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                # updating all block items to the list of items to delete

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                while blocktype_item.IsOk():

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                    items_to_delete.append(blocktype_item)

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                    blocktype_item, category_cookie = \

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                        self.Tree.GetNextChild(category_item, category_cookie)

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                # Get next category tree item under root item

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                category_item, root_cookie = \

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                    self.Tree.GetNextChild(root, root_cookie)

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            # Add every remaining tree item under root item after updating all

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            # category items to the list of items to delete

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            while category_item.IsOk():

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                items_to_delete.append(category_item)

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                category_item, root_cookie = \

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                    self.Tree.GetNextChild(root, root_cookie)

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            # Remove all items in list of items to delete from TreeCtrl

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            for item in items_to_delete:

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                self.Tree.Delete(item)

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   292

    def GetSelectedBlock(self):

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        """

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        Get selected block informations

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        @return: {"type": block_type_name, "inputs": [input_type,...]} or None

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        if no block selected

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        """

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        # Get selected item associated data in tree

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        selected_item = self.Tree.GetSelection()

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        selected_pydata = (self.Tree.GetPyData(selected_item)

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                           if (selected_item.IsOk() and

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                               selected_item != self.Tree.GetRootItem())

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                           else None)

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        # Return value is None if selected tree item is root or a category

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        return ({"type": self.Tree.GetItemText(selected_item),

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                 "inputs": selected_pydata["inputs"]}

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                if (selected_pydata is not None and

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                    selected_pydata["type"] == BLOCK)

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                else None)

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   312

    def SelectTreeItem(self, name, inputs):

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        """

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        Select Tree item corresponding to block informations given

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        @param name: Block type name

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        @param inputs: List of block inputs type [input_type,...]

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        """

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        # Find tree item corresponding to block informations

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        item = self.FindTreeItem(self.Tree.GetRootItem(), name, inputs)

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        if item is not None and item.IsOk():

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            # Select tree item found

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            self.Tree.SelectItem(item)

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            self.Tree.EnsureVisible(item)

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   325

    def FindTreeItem(self, item, name, inputs=None):

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        """

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        Find Tree item corresponding to block informations given

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        Function is recursive

   329

        @param item: Item to test

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        @param name: Block type name

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        @param inputs: List of block inputs type [input_type,...]

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        """

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        # Return immediately if item isn't valid

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        if not item.IsOk():

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            return None

   336

   337

        # Get data associated to item to test

   338

        item_pydata = self.Tree.GetPyData(item)

   339

        if item_pydata is not None and item_pydata["type"] == BLOCK:

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            # Only test item corresponding to block

   341

   342

            # Test if block inputs type are the same than those given

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            type_inputs = item_pydata.get("inputs", None)

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            type_extension = item_pydata.get("extension", None)

   345

            if inputs is not None and type_inputs is not None:

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                same_inputs = reduce(

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                    lambda x, y: x and y,

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                    map(

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                        lambda x: x[0] == x[1] or x[0] == 'ANY' or x[1] == 'ANY',

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                        zip(type_inputs,

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                            (inputs[:type_extension]

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                             if type_extension is not None

   353

                             else inputs))),

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                    True)

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            else:

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                same_inputs = True

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            # Return item if  block data corresponds to informations given

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            if self.Tree.GetItemText(item) == name and same_inputs:

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                return item

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   362

        # Test item children if item doesn't correspond

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        child, child_cookie = self.Tree.GetFirstChild(item)

   364

        while child.IsOk():

   365

            result = self.FindTreeItem(child, name, inputs)

   366

            if result:

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                return result

   368

            child, child_cookie = self.Tree.GetNextChild(item, child_cookie)

   369

   370

        return None

   371

   372

    def SearchInTree(self, value, mode="first"):

   373

        """

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        Search in Tree and select item that name contains string given

   375

        @param value: String contained in block name to find

   376

        @param mode: Search mode ('first', 'previous' or 'next')

   377

        (default: 'first')

   378

        @return: True if an item was found

   379

        """

   380

        # Return immediately if root isn't valid

   381

        root = self.Tree.GetRootItem()

   382

        if not root.IsOk():

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            return False

   384

   385

        # Set function to navigate in Tree item sibling according to search

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        # mode defined

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        sibling_function = (self.Tree.GetPrevSibling

   388

                            if mode == "previous"

   389

                            else self.Tree.GetNextSibling)

   390

   391

        # Get current selected item (for next and previous mode)

   392

        item = self.Tree.GetSelection()

   393

        if not item.IsOk() or mode == "first":

   394

            item, _item_cookie = self.Tree.GetFirstChild(root)

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            selected = None

   396

        else:

   397

            selected = item

   398

   399

        # Navigate through tree items until one matching found or reach tree

   400

        # starting or ending

   401

        while item.IsOk():

   402

   403

            # Get item data to get item type

   404

            item_pydata = self.Tree.GetPyData(item)

   405

   406

            # Item is a block category

   407

            if (item == root) or item_pydata["type"] == CATEGORY:

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   409

                # Get category first or last child according to search mode

   410

                # defined

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                child = (self.Tree.GetLastChild(item)

   412

                         if mode == "previous"

   413

                         else self.Tree.GetFirstChild(item)[0])

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   415

                # If category has no child, go to sibling category

   416

                item = (child if child.IsOk() else sibling_function(item))

   417

   418

            # Item is a block

   419

            else:

   420

   421

                # Extract item block name

   422

                name = self.Tree.GetItemText(item)

   423

                # Test if block name contains string given

   424

                if name.upper().find(value.upper()) != -1 and item != selected:

   425

                    # Select block and collapse all categories other than block

   426

                    # category

   427

                    child, child_cookie = self.Tree.GetFirstChild(root)

   428

                    while child.IsOk():

   429

                        self.Tree.CollapseAllChildren(child)

   430

                        child, child_cookie = self.Tree.GetNextChild(root, child_cookie)

   431

                    self.Tree.SelectItem(item)

   432

                    self.Tree.EnsureVisible(item)

   433

                    return True

   434

   435

                # Go to next item sibling if block not found

   436

                next = sibling_function(item)

   437

   438

                # If category has no other child, go to next category sibling

   439

                item = (next

   440

                        if next.IsOk()

   441

                        else sibling_function(self.Tree.GetItemParent(item)))

   442

   443

        return False

   444

   445

    def OnSearchCtrlChanged(self, event):

   446

        """

   447

        Called when SearchCtrl text control value changed

   448

        @param event: TextCtrl change event

   449

        """

   450

        # Search for block containing SearchCtrl value in 'first' mode

   451

        self.SearchInTree(self.SearchCtrl.GetValue())

   452

        event.Skip()

   453

   454

    def OnSearchButtonClick(self, event):

   455

        """

   456

        Called when SearchCtrl search button was clicked

   457

        @param event: Button clicked event

   458

        """

   459

        # Search for block containing SearchCtrl value in 'next' mode

   460

        self.SearchInTree(self.SearchCtrl.GetValue(), "next")

   461

        event.Skip()

   462

   463

    def OnTreeItemSelected(self, event):

   464

        """

   465

        Called when tree item is selected

   466

        @param event: wx.TreeEvent

   467

        """

   468

        # Update TextCtrl value with block selected usage

   469

        item_pydata = self.Tree.GetPyData(event.GetItem())

   470

        self.Comment.SetValue(

   471

            item_pydata["comment"]

   472

            if item_pydata is not None and item_pydata["type"] == BLOCK

   473

            else "")

   474

   475

        # Call extra function defined when tree item is selected

   476

        if getattr(self, "_OnTreeItemSelected", None) is not None:

   477

            self._OnTreeItemSelected(event)

   478

   479

        event.Skip()

   480

   481

    def OnTreeBeginDrag(self, event):

   482

        """

   483

        Called when a drag is started in tree

   484

        @param event: wx.TreeEvent