1

#!/usr/bin/env python

     2

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

     3

     6

#

     8

#

    10

#

    15

#

    20

#

    24

    25

import wx

    26

    27

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

    28

#                                 Helpers

    29

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

    30

    31

[CATEGORY, BLOCK] = range(2)

    32

    33

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

    34

#                              Library Panel

    35

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

    36

    37

"""

    38

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

    39

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

    40

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

    41

displaying informations about selected functions or function blocks

    42

"""

    43

    44

class LibraryPanel(wx.Panel):

    45

    46

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

    47

        """

    48

        Constructor

    49

        @param parent: Parent wx.Window of LibraryPanel

    50

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

    51

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

    52

        """

    53

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

    54

    55

        # Define LibraryPanel main sizer

    56

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

    57

        main_sizer.AddGrowableCol(0)

    58

        main_sizer.AddGrowableRow(1)

    59

    60

        # Add SearchCtrl to main sizer

    61

        self.SearchCtrl = wx.SearchCtrl(self)

    62

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

    63

        # control is for searching in tree

    64

        self.SearchCtrl.ShowSearchButton(True)

    65

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

    66

        self.Bind(wx.EVT_SEARCHCTRL_SEARCH_BTN, 

    67

                  self.OnSearchButtonClick, self.SearchCtrl)

    68

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

    69

        # for search previous and next occurrence

    70

    71

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

    72

        if self.SearchCtrl.GetChildren():

    73

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

    74

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

    75

    76

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

    77

    78

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

    79

        splitter_window = wx.SplitterWindow(self)

    80

        splitter_window.SetSashGravity(1.0)

    81

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

    82

    83

        # Add TreeCtrl for functions and function blocks library in splitter

    84

        # window

    85

        self.Tree = wx.TreeCtrl(splitter_window,

    86

              size=wx.Size(0, 0),  

    87

              style=wx.TR_HAS_BUTTONS|

    88

                    wx.TR_SINGLE|

    89

                    wx.SUNKEN_BORDER|

    90

                    wx.TR_HIDE_ROOT|

    91

                    wx.TR_LINES_AT_ROOT)

    92

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

    93

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

    94

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

    95

        # tree to start a drag'n drop

    96

        if enable_drag:

    97

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

    98

    99

        # Add TextCtrl for function and function block informations

   100

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

   101

              style=wx.TE_READONLY|wx.TE_MULTILINE)

   102

   103

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

   104

   105

        self.SetSizer(main_sizer)

   106

   107

        # Reference to the project controller

   108

        self.Controller = None

   109

   110

        # Variable storing functions and function blocks library to display

   111

        self.BlockList = None

   112

   113

    def __del__(self):

   114

        """

   115

        Destructor

   116

        """

   117

        # Remove reference to project controller

   118

        self.Controller = None

   119

   120

    def SetController(self, controller):

   121

        """

   122

        Set reference to project controller

   123

        @param controller: Reference to project controller

   124

        """

   125

        self.Controller = controller

   126

   127

    def SetBlockList(self, blocklist):

   128

        """

   129

        Set function and function block library to display in TreeCtrl

   130

        @param blocklist: Function and function block library

   131

        """

   132

        # Save functions and function blocks library

   133

        self.BlockList = blocklist

   134

        # Refresh TreeCtrl values

   135

        self.RefreshTree()

   136

   137

    def SetFocus(self):

   138

        """

   139

        Called to give focus to LibraryPanel

   140

        Override wx.Window SetFocus method 

   141

        """

   142

        # Give focus to SearchCtrl

   143

        self.SearchCtrl.SetFocus()

   144

   145

    def ResetTree(self):

   146

        """

   147

        Reset LibraryPanel values displayed in controls

   148

        """

   149

        # Clear SearchCtrl, TreeCtrl and TextCtrl

   150

        self.SearchCtrl.SetValue("")

   151

        self.Tree.DeleteAllItems()

   152

        self.Comment.SetValue("")

   153

   154

    def RefreshTree(self):

   155

        """

   156

        Refresh LibraryPanel values displayed in controls

   157

        """

   158

        # Get function and function blocks library

   159

        blocktypes = self.BlockList

   160

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

   161

            # Get library from project controller if not defined

   162

            blocktypes = self.Controller.GetBlockTypes()

   163

   164

        # Refresh TreeCtrl values if a library is defined

   165

        if blocktypes is not None:

   166

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

   167

            # will be refreshed

   168

            items_to_delete = []

   169

   170

            # Get current selected item for selected it when values refreshed

   171

            selected_item = self.Tree.GetSelection()

   172

            selected_pydata = (self.Tree.GetPyData(selected_item)

   173

                               if selected_item.IsOk() and

   174

                                  selected_item != self.Tree.GetRootItem()

   175

                               else None)

   176

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

   177

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

   178

                               selected_pydata["inputs"])

   179

                             if selected_pydata is not None and

   180

                                selected_pydata["type"] == BLOCK

   181

                             else (None, None))

   182

   183

            # Get TreeCtrl root item (hidden)

   184

            root = self.Tree.GetRootItem()

   185

            if not root.IsOk():

   186

                # Create root if not present

   187

                root = self.Tree.AddRoot("")

   188

   189

            # Iterate over functions and function blocks library categories and

   190

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

   191

   192

            # Get first child under root item

   193

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

   194

            for category in blocktypes:

   195

                # Store category name in a local variable to prevent script

   196

                # extracting translated strings for gettext to consider "name"

   197

                # to be translated

   198

                category_name = category["name"]

   199

   200

                # Tree item already exists, set item label

   201

                if category_item.IsOk():

   202

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

   203

   204

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

   205

                else:

   206

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

   207

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

   208

                    # reference to the newly added tree item

   209

                    if wx.Platform != '__WXMSW__':

   210

                        category_item, root_cookie = \

   211

                            self.Tree.GetNextChild(root, root_cookie)

   212

   213

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

   214

                # category)

   215

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

   216

   217

                # Iterate over functions and function blocks defined in library

   218

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

   219

                # them

   220

   221

                # Get first child under category tree item

   222

                blocktype_item, category_cookie = \

   223

                    self.Tree.GetFirstChild(category_item)

   224

                for blocktype in category["list"]:

   225

   226

                    # Tree item already exists, set item label

   227

                    if blocktype_item.IsOk():

   228

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

   229

   230

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

   231

                    else:

   232

                        blocktype_item = self.Tree.AppendItem(

   233

                                            category_item, blocktype["name"])

   234

                        # See comment when adding category

   235

                        if wx.Platform != '__WXMSW__':

   236

                            blocktype_item, category_cookie = \

   237

                                self.Tree.GetNextChild(category_item, 

   238

                                                       category_cookie)

   239

   240

                    # Define data to associate to block tree item

   241

                    comment = blocktype["comment"]

   242

                    block_data = {"type" : BLOCK, 

   243

                                  "block_type" : blocktype["type"], 

   244

                                  "inputs" : tuple([type 

   245

                                                    for name, type, modifier

   246

                                                    in blocktype["inputs"]]), 

   247

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

   248

                                                 if blocktype["extensible"]

   249

                                                 else None),

   250

                                  "comment": _(comment) + 

   251

                                             blocktype.get("usage", "")}

   252

                    self.Tree.SetPyData(blocktype_item, block_data)

   253

   254

                    # Select block tree item in tree if it corresponds to

   255

                    # previously selected one

   256

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

   257

                                          blocktype["inputs"]):

   258

                        self.Tree.SelectItem(blocktype_item)

   259

   260

                        # Update TextCtrl value

   261

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

   262

   263

                    # Get next block tree item under category tree item

   264

                    blocktype_item, category_cookie = \

   265

                        self.Tree.GetNextChild(category_item, category_cookie)

   266

   267

                # Add every remaining tree item under category tree item after

   268

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

   269

                while blocktype_item.IsOk():

   270

                    items_to_delete.append(blocktype_item)

   271

                    blocktype_item, category_cookie = \

   272

                        self.Tree.GetNextChild(category_item, category_cookie)

   273

   274

                # Get next category tree item under root item

   275

                category_item, root_cookie = \

   276

                    self.Tree.GetNextChild(root, root_cookie)

   277

   278

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

   279

            # category items to the list of items to delete

   280

            while category_item.IsOk():

   281

                items_to_delete.append(category_item)

   282

                category_item, root_cookie = \

   283

                    self.Tree.GetNextChild(root, root_cookie)

   284

   285

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

   286

            for item in items_to_delete:

   287

                self.Tree.Delete(item)

   288

   289

    def GetSelectedBlock(self):

   290

        """

   291

        Get selected block informations

   292

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

   293

        if no block selected

   294

        """

   295

        # Get selected item associated data in tree

   296

        selected_item = self.Tree.GetSelection()

   297

        selected_pydata = (self.Tree.GetPyData(selected_item)

   298

                           if selected_item.IsOk() and

   299

                              selected_item != self.Tree.GetRootItem()

   300

                           else None)

   301

   302

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

   303

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

   304

                 "inputs": selected_pydata["inputs"]}

   305

                if selected_pydata is not None and 

   306

                   selected_pydata["type"] == BLOCK

   307

                else None)

   308

   309

    def SelectTreeItem(self, name, inputs):

   310

        """

   311

        Select Tree item corresponding to block informations given 

   312

        @param name: Block type name

   313

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

   314

        """

   315

        # Find tree item corresponding to block informations

   316

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

   317

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

   318

            # Select tree item found

   319

            self.Tree.SelectItem(item)

   320

            self.Tree.EnsureVisible(item)

   321

   322

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

   323

        """

   324

        Find Tree item corresponding to block informations given

   325

        Function is recursive

   326

        @param item: Item to test

   327

        @param name: Block type name

   328

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

   329

        """

   330

        # Return immediately if item isn't valid

   331

        if not item.IsOk():

   332

            return None

   333

   334

        # Get data associated to item to test

   335

        item_pydata = self.Tree.GetPyData(item)

   336

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

   337

            # Only test item corresponding to block

   338

   339

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

   340

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

   341

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

   342

            if inputs is not None and type_inputs is not None:

   343

                same_inputs = reduce(

   344

                    lambda x, y: x and y,

   345

                    map(

   346

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

   347

                        zip(type_inputs,

   348

                            (inputs[:type_extension]

   349

                             if type_extension is not None

   350

                             else inputs))),

   351

                    True)

   352

            else:

   353

                same_inputs = True

   354

   355

            # Return item if  block data corresponds to informations given

   356

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

   357

                return item

   358

   359

        # Test item children if item doesn't correspond

   360

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

   361

        while child.IsOk():

   362

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

   363

            if result:

   364

                return result

   365

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

   366

   367

        return None

   368

   369

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

   370

        """

   371

        Search in Tree and select item that name contains string given

   372

        @param value: String contained in block name to find

   373

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

   374

        (default: 'first')

   375

        @return: True if an item was found

   376

        """

   377

        # Return immediately if root isn't valid

   378

        root = self.Tree.GetRootItem()

   379

        if not root.IsOk():

   380

            return False

   381

   382

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

   383

        # mode defined 

   384

        sibling_function = (self.Tree.GetPrevSibling

   385

                            if mode == "previous"

   386

                            else self.Tree.GetNextSibling)

   387

   388

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

   389

        item = self.Tree.GetSelection()

   390

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

   391

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

   392

            selected = None

   393

        else:

   394

            selected = item

   395

   396

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

   397

        # starting or ending

   398

        while item.IsOk():

   399

   400

            # Get item data to get item type

   401

            item_pydata = self.Tree.GetPyData(item)

   402

   403

            # Item is a block category

   404

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

   405

   406

                # Get category first or last child according to search mode 

   407

                # defined

   408

                child = (self.Tree.GetLastChild(item)

   409

                         if mode == "previous"

   410

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

   411

   412

                # If category has no child, go to sibling category

   413

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

   414

   415

            # Item is a block

   416

            else:

   417

   418

                # Extract item block name

   419

                name = self.Tree.GetItemText(item)

   420

                # Test if block name contains string given

   421

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

   422

                    # Select block and collapse all categories other than block

   423

                    # category

   424

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

   425

                    while child.IsOk():

   426

                        self.Tree.CollapseAllChildren(child)

   427

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

   428

                    self.Tree.SelectItem(item)

   429

                    self.Tree.EnsureVisible(item)

   430

                    return True

   431

   432

                # Go to next item sibling if block not found

   433

                next = sibling_function(item)

   434

   435

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

   436

                item = (next

   437

                        if next.IsOk()

   438

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

   439

   440

        return False

   441

   442

    def OnSearchCtrlChanged(self, event):

   443

        """

   444

        Called when SearchCtrl text control value changed

   445

        @param event: TextCtrl change event

   446

        """

   447

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

   448

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

   449

        event.Skip()

   450

   451

    def OnSearchButtonClick(self, event):

   452

        """

   453

        Called when SearchCtrl search button was clicked

   454

        @param event: Button clicked event

   455

        """

   456

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

   457

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

   458

        event.Skip()

   459

   460

    def OnTreeItemSelected(self, event):

   461

        """

   462

        Called when tree item is selected

   463

        @param event: wx.TreeEvent

   464

        """

   465

        # Update TextCtrl value with block selected usage

   466

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

   467

        self.Comment.SetValue(

   468

            item_pydata["comment"]

   469

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

   470

            else "")

   471

   472

        # Call extra function defined when tree item is selected

   473

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

   474

            self._OnTreeItemSelected(event)

   475

   476

        event.Skip()

   477

   478

    def OnTreeBeginDrag(self, event):

   479

        """

   480

        Called when a drag is started in tree

   481

        @param event: wx.TreeEvent

   482

        """

   483

        selected_item = event.GetItem()

   484

        item_pydata = self.Tree.GetPyData(selected_item)

   485

   486

        # Item dragged is a block

   487

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

   488

            # Start a drag'n drop

   489

            data = wx.TextDataObject(str(

   490

                (self.Tree.GetItemText(selected_item), 

   491

                 item_pydata["block_type"], 

   492

                 "", 

   493

                 item_pydata["inputs"])))

   494

            dragSource = wx.DropSource(self.Tree)

   495

            dragSource.SetData(data)

   496

            dragSource.DoDragDrop()

   497

   498

    def OnKeyDown(self, event):