1

#!/usr/bin/env python

     2

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

     3

     4

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

     5

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

     6

#

     7

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

     8

#

     9

# See COPYING file for copyrights details.

    10

#

    11

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

    12

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

    13

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

    14

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

    15

#

    16

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

    17

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

    18

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

    19

# GNU General Public License for more details.

    20

#

    21

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

    22

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

    23

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

    24

    25

    26

import pickle

    27

import wx

    28

    29

MAX_ITEM_COUNT = 10

    30

MAX_ITEM_SHOWN = 6

    31

if wx.Platform == '__WXMSW__':

    32

    LISTBOX_BORDER_HEIGHT = 2

    33

    LISTBOX_INTERVAL_HEIGHT = 0

    34

else:

    35

    LISTBOX_BORDER_HEIGHT = 4

    36

    LISTBOX_INTERVAL_HEIGHT = 6

    37

    38

    39

class PopupWithListbox(wx.PopupWindow):

    40

    41

    def __init__(self, parent, choices=None):

    42

        wx.PopupWindow.__init__(self, parent, wx.BORDER_SIMPLE)

    43

    44

        self.ListBox = wx.ListBox(self, -1, style=wx.LB_HSCROLL | wx.LB_SINGLE | wx.LB_SORT)

    45

    46

        choices = [] if choices is None else choices

    47

        self.SetChoices(choices)

    48

    49

        self.ListBox.Bind(wx.EVT_LEFT_DOWN, self.OnLeftDown)

    50

        self.ListBox.Bind(wx.EVT_MOTION, self.OnMotion)

    51

    52

    def SetChoices(self, choices):

    53

        max_text_width = 0

    54

        max_text_height = 0

    55

    56

        self.ListBox.Clear()

    57

        for choice in choices:

    58

            self.ListBox.Append(choice)

    59

            w, h = self.ListBox.GetTextExtent(choice)

    60

            max_text_width = max(max_text_width, w)

    61

            max_text_height = max(max_text_height, h)

    62

    63

        itemcount = min(len(choices), MAX_ITEM_SHOWN)

    64

        width = self.Parent.GetSize()[0]

    65

        height = \

    66

            max_text_height * itemcount + \

    67

            LISTBOX_INTERVAL_HEIGHT * max(0, itemcount - 1) + \

    68

            2 * LISTBOX_BORDER_HEIGHT

    69

        if max_text_width + 10 > width:

    70

            height += 15

    71

        size = wx.Size(width, height)

    72

        if wx.Platform == '__WXMSW__':

    73

            size.width -= 2

    74

        self.ListBox.SetSize(size)

    75

        self.SetClientSize(size)

    76

    77

    def MoveSelection(self, direction):

    78

        selected = self.ListBox.GetSelection()

    79

        if selected == wx.NOT_FOUND:

    80

            if direction >= 0:

    81

                selected = 0

    82

            else:

    83

                selected = self.ListBox.GetCount() - 1

    84

        else:

    85

            selected = (selected + direction) % (self.ListBox.GetCount() + 1)

    86

        if selected == self.ListBox.GetCount():

    87

            selected = wx.NOT_FOUND

    88

        self.ListBox.SetSelection(selected)

    89

    90

    def GetSelection(self):

    91

        return self.ListBox.GetStringSelection()

    92

    93

    def OnLeftDown(self, event):

    94

        selected = self.ListBox.HitTest(wx.Point(event.GetX(), event.GetY()))

    95

        parent_size = self.Parent.GetSize()

    96

        parent_rect = wx.Rect(0, -parent_size[1], parent_size[0], parent_size[1])

    97

        if selected != wx.NOT_FOUND:

    98

            wx.CallAfter(self.Parent.SetValueFromSelected, self.ListBox.GetString(selected))

    99

        elif parent_rect.Contains(event.GetX(), event.GetY()):

   100

            result, x, y = self.Parent.HitTest(wx.Point(event.GetX(), event.GetY() + parent_size[1]))

   101

            if result != wx.TE_HT_UNKNOWN:

   102

                self.Parent.SetInsertionPoint(self.Parent.XYToPosition(x, y))

   103

        else:

   104

            wx.CallAfter(self.Parent.DismissListBox)

   105

        event.Skip()

   106

   107

    def OnMotion(self, event):

   108

        self.ListBox.SetSelection(

   109

            self.ListBox.HitTest(wx.Point(event.GetX(), event.GetY())))

   110

        event.Skip()

   111

   112

   113

class TextCtrlAutoComplete(wx.TextCtrl):

   114

   115

    def __init__(self, parent, choices=None, dropDownClick=True,

   116

                 element_path=None, **therest):

   117

        """

   118

        Constructor works just like wx.TextCtrl except you can pass in a

   119

        list of choices.  You can also change the choice list at any time

   120

        by calling setChoices.

   121

        """

   122

   123

        therest['style'] = wx.TE_PROCESS_ENTER | therest.get('style', 0)

   124

   125

        wx.TextCtrl.__init__(self, parent, **therest)

   126

   127

        # Some variables

   128

        self._dropDownClick = dropDownClick

   129

        self._lastinsertionpoint = None

   130

        self._hasfocus = False

   131

   132

        self._screenheight = wx.SystemSettings.GetMetric(wx.SYS_SCREEN_Y)

   133

        self.element_path = element_path

   134

   135

        self.listbox = None

   136

   137

        self.SetChoices(choices)

   138

   139

        # gp = self

   140

        # while ( gp != None ) :

   141

        #    gp.Bind ( wx.EVT_MOVE , self.onControlChanged, gp )

   142

        #    gp.Bind ( wx.EVT_SIZE , self.onControlChanged, gp )

   143

        #    gp = gp.GetParent()

   144

   145

        self.Bind(wx.EVT_KILL_FOCUS, self.OnControlChanged)

   146

        self.Bind(wx.EVT_TEXT_ENTER, self.OnControlChanged)

   147

        self.Bind(wx.EVT_TEXT, self.OnEnteredText)

   148

        self.Bind(wx.EVT_KEY_DOWN, self.OnKeyDown)

   149

   150

        # If need drop down on left click

   151

        if dropDownClick:

   152

            self.Bind(wx.EVT_LEFT_DOWN, self.OnClickToggleDown)

   153

            self.Bind(wx.EVT_LEFT_UP, self.OnClickToggleUp)

   154

   155

    def ChangeValue(self, value):

   156

        wx.TextCtrl.ChangeValue(self, value)

   157

        self.RefreshListBoxChoices()

   158

   159

    def OnEnteredText(self, event):

   160

        wx.CallAfter(self.RefreshListBoxChoices)

   161

        event.Skip()

   162

   163

    def OnKeyDown(self, event):

   164

        """ Do some work when the user press on the keys:

   165

            up and down: move the cursor

   166

        """

   167

        keycode = event.GetKeyCode()

   168

        if keycode in [wx.WXK_DOWN, wx.WXK_UP]:

   169

            self.PopupListBox()

   170

            if keycode == wx.WXK_DOWN:

   171

                self.listbox.MoveSelection(1)

   172

            else:

   173

                self.listbox.MoveSelection(-1)

   174

        elif keycode in [wx.WXK_LEFT, wx.WXK_RIGHT, wx.WXK_RETURN] and self.listbox is not None:

   175

            selected = self.listbox.GetSelection()

   176

            if selected != "":

   177

                self.SetValueFromSelected(selected)

   178

            else:

   179

                event.Skip()

   180

        elif event.GetKeyCode() == wx.WXK_ESCAPE:

   181

            self.DismissListBox()

   182

        else:

   183

            event.Skip()

   184

   185

    def OnClickToggleDown(self, event):

   186

        self._lastinsertionpoint = self.GetInsertionPoint()

   187

        event.Skip()

   188

   189

    def OnClickToggleUp(self, event):

   190

        if not self._hasfocus:

   191

            self._hasfocus = True

   192

        elif self.GetInsertionPoint() == self._lastinsertionpoint:

   193

            wx.CallAfter(self.PopupListBox)

   194

        self._lastinsertionpoint = None

   195

        event.Skip()

   196

   197

    def OnControlChanged(self, event):

   198

        res = self.GetValue()

   199

        config = wx.ConfigBase.Get()

   200

        listentries = pickle.loads(config.Read(self.element_path,

   201

                                               pickle.dumps([], 0).decode()

   202

                                              ).encode())

   203

        if res and res not in listentries:

   204

            listentries = (listentries + [res])[-MAX_ITEM_COUNT:]

   205

            config.Write(self.element_path, pickle.dumps(listentries, 0))

   206

            config.Flush()

   207

            self.SetChoices(listentries)

   208

        self.DismissListBox()

   209

        self._hasfocus = False

   210

        event.Skip()

   211

   212

    def SetChoices(self, choices):

   213

        self._choices = choices

   214

        self.RefreshListBoxChoices()

   215

   216

    def GetChoices(self):

   217

        return self._choices

   218

   219

    def SetValueFromSelected(self, selected):

   220

        """

   221

        Sets the wx.TextCtrl value from the selected wx.ListCtrl item.

   222

        Will do nothing if no item is selected in the wx.ListCtrl.

   223

        """

   224

        if selected != "":

   225

            self.SetValue(selected)

   226

        self.DismissListBox()

   227

   228

    def RefreshListBoxChoices(self):

   229

        if self.listbox is not None:

   230

            text = self.GetValue()

   231

            choices = [choice for choice in self._choices if choice.startswith(text)]

   232

            self.listbox.SetChoices(choices)

   233

   234

    def PopupListBox(self):

   235

        if self.listbox is None:

   236

            self.listbox = PopupWithListbox(self)

   237

   238

            # Show the popup right below or above the button

   239

            # depending on available screen space...

   240

            pos = self.ClientToScreen((0, 0))

   241

            sz = self.GetSize()

   242

            if wx.Platform == '__WXMSW__':

   243

                pos.x -= 2

   244

                pos.y -= 2

   245

            self.listbox.Position(pos, (0, sz[1]))

   246

   247

            self.RefreshListBoxChoices()

   248

   249

            self.listbox.Show()

   250

   251

    def DismissListBox(self):

   252

        if self.listbox is not None:

   253

            if self.listbox.ListBox.HasCapture():

   254

                self.listbox.ListBox.ReleaseMouse()

   255

            self.listbox.Destroy()

   256

            self.listbox = None