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# .+
# .context    : Application View Controller
# .title      : AVC Qt3 bindings
# .kind	      : python source
# .author     : Fabrizio Pollastri
# .site	      : Revello - Italy
# .creation   :	7-Nov-2006
# .copyright  :	(c) 2006-2011 Fabrizio Pollastri
# .license    : GNU General Public License (see below)
#
# This file is part of "AVC, Application View Controller".
#
# AVC 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 3 of the License, or
# (at your option) any later version.
#
# AVC 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 AVC.  If not, see <http://www.gnu.org/licenses/>.
#
# .-

 
#### IMPORT REQUIRED MODULES

import qt			# Qt tool kit bindings

import string			# string operations


#### GENERAL ABSTRACTION METHODS

def toplevel_widgets():
  "Return the list of all top level widgets"
  return qt.QApplication.topLevelWidgets()

def init(core):
  "Do init specific for this widget toolkit"
  # mapping between real widget and the wal widget
  core['avccd'].widget_map = { \
    qt.QPushButton:	core['Button'], \
    qt.QCheckBox:	core['ToggleButton'], \
    qt.QComboBox:	core['ComboBox'], \
    qt.QLineEdit:	core['Entry'], \
    qt.QLabel:		core['Label'], \
    qt.QListView:	core['listtreeview'], \
    qt.QProgressBar:	core['ProgressBar'], \
    qt.QRadioButton:	core['RadioButton'], \
    qt.QSlider:		core['Slider'], \
    qt.QSpinBox:	core['SpinButton'], \
    qt.QTextEdit:	core['TextView']}
  # get toolkit version
  core['avccd'].toolkit_version = qt.PYQT_VERSION_STR


def widget_children(widget):
  "Return the list of all children of the widget"
  return widget.children() or []

def widget_name(widget):
  "Return the widget name"
  return widget.name()

def timer(function,period):
  "Start a Qt timer calling back 'function' every 'period' seconds."
  timer = qt.QTimer()
  qt.QObject.connect(timer,qt.SIGNAL("timeout()"),function)
  timer.start(int(period * 1000.0))
  return timer


#### WIDGETS ABSTRACTION LAYER (widget toolkit side)

class Widget:
  "Qt3 Widget Abstraction Layer abstract class"

  def connect_delete(self,widget,delete_method):
    "Connect widget delete method to destroy event"
    qt.QObject.connect(widget,qt.SIGNAL("destroyed()"),delete_method)
       

class ListTreeView(Widget):
  "Support to ListView and TreeView abstractors"

  def __init__(self):
    "Init operations common to ListView and TreeView"

    # clear all items and remove all columns, if any
    self.widget.clear()
    map(self.widget.removeColumn,range(self.widget.columns()))

    # inhibit autosorting
    self.widget.setSorting(999999999)

    # connect relevant signals
    qt.QObject.connect(self.widget,
      qt.SIGNAL("selectionChanged(QListViewItem*)"),self.value_changed)
    qt.QObject.connect(self.widget,
      qt.SIGNAL("currentChanged(QListViewItem*)"),self.value_changed)
    qt.QObject.connect(self.widget,
      qt.SIGNAL("itemRenamed(QListViewItem*,int)"),self.value_changed)

  def append_column(self,col_num,text):
   "Append a column to the TreeView"
   self.widget.addColumn(text)
   

class Button(Widget):
  "Qt3 Button widget abstractor"

  def __init__(self):
    # connect relevant signals
    qt.QObject.connect(
      self.widget,qt.SIGNAL("pressed()"),self.value_changed)
    qt.QObject.connect(
      self.widget,qt.SIGNAL("released()"),self.value_changed)

  def read(self):
    return self.widget.isDown()

  def write(self,value):
    "Set button status"
    self.widget.setDown(value)


class ComboBox(Widget):
  "Qt3 ComboBox widget abstractor"

  def __init__(self):
    # connect relevant signals to handlers
    qt.QObject.connect(
      self.widget,qt.SIGNAL("activated(int)"),self.value_changed)

  def read(self):
    "Get index of selected item"
    return self.widget.currentItem()

  def write(self,value):
    "Set selected item by its index value"
    self.widget.setCurrentItem(value)


class Entry(Widget):
  "Qt3 Entry widget abstractor"

  def __init__(self):
    # connect relevant signals to handlers
    qt.QObject.connect(
      self.widget,qt.SIGNAL("returnPressed()"),self.value_changed)

  def read(self):
    "Get text from Entry"
    return self.widget.text()
    
  def write(self,value):
    "Set text into Entry"
    self.widget.setText(str(value))
 

class Label(Widget):
  "Qt3 Label widget abstractor"

  def __init__(self):
    pass

  def read(self):
    "Get text into Label"
    return str(self.widget.text())

  def write(self,value):
    "Set text into Label"
    self.widget.setText(value)


class ListView(ListTreeView):
  "Qt3 TreeView widget abstractor"

  def __init__(self):
    pass

  def read(self):
    "Get values displayed by widget"
    # get head
    head = map(lambda col_num: str(self.widget.columnText(col_num)),
      range(self.widget.columns()))
    # get data rows
    body = []
    item = self.widget.firstChild()
    while item:
      row = []
      for col_num in range(self.cols_num):
        try:
          row.append(self.row_types[col_num](item.text(col_num)))
        except:
          if self.row_types[col_num] == int:
            row.append(0)
          elif self.row_types[col_num] == float:
            row.append(0.0)
      body.append(row)
      item = item.nextSibling()
    # return
    return {'head': head,'body': body}

  def write(self,value):
    "Set values displayed by widget"
    # set header
    if value.has_key('head'):
      map(self.widget.setColumnText,
        range(self.widget.columns()),value['head'])
    # set data rows
    self.widget.clear()
    self.widget.setSorting(999999999)
    body = value['body']
    last_item = None
    if type(body[0]) == list:
      for row in body:
        last_item = qt.QListViewItem(*[self.widget,last_item] + map(str,row))
    else:
      for row in body:
        last_item = qt.QListViewItem(self.widget,last_item,str(row))


class ProgressBar(Widget):
  "Qt3 ProgressBar widget abstractor"

  def __init__(self):
    self.widget.setProgress(10,0)
    pass

  def read(self):
    "Get progress bar position"
    return self.widget.progress() / 100.0
    
  def write(self,value):
    "Set progress bar position"
    # negative values pulse the bar, positive values position the bar. 
    if value < 0:
      #self.widget.reset()
      self.widget.setProgress(0,0)
    else:
      self.widget.setProgress(int(round(value * 100)),100)


class RadioButton(Widget):
  "Qt3 RadioButton widget abstractor"

  def __init__(self):
    # connect relevant signals
    qt.QObject.connect(
      self.widget,qt.SIGNAL("clicked()"),self.value_changed)

  def read(self):
    "Get index of activated button"
    return self.widget.group().selectedId()

  def write(self,value):
    "Set activate button indexed by value"
    self.widget.group().setButton(value)

 
class Slider(Widget):
  "Qt3 Slider widget abstractor"

  def __init__(self):
    # connect relevant signals to handlers
    qt.QObject.connect(
      self.widget,qt.SIGNAL("valueChanged(int)"),self.value_changed)
 
  def read(self):
    "Get Slider value"
    return self.widget.value()

  def write(self,value):
    "Set Slider value"
    self.widget.setValue(value)


class SpinButton(Widget):
  "Qt3 SpinButton widget abstractor"

  def __init__(self):
    # connect relevant signals to handlers
    qt.QObject.connect(
      self.widget,qt.SIGNAL("valueChanged(int)"),self.value_changed)
 
  def read(self):
    "Get spinbutton value"
    return self.widget.value()

  def write(self,value):
    "Set spinbutton value"
    self.widget.setValue(value)


class StatusBar(Widget):
  "Qt3 no status bar support"
  pass


class TextView(Widget):
  "Qt3 TextView/Edit widget abstractor"

  def __init__(self):
    # connect relevant signals
    qt.QObject.connect(
      self.widget,qt.SIGNAL("returnPressed()"),self.value_changed)

  def read(self):
    "Get text from TextView"
    return str(self.widget.text())
    
  def write(self,value):
    "Set text into TextView"
    self.widget.setText(str(value))
 

class ToggleButton(Widget):
  "Qt3 ToggleButton widget abstractor"

  def __init__(self):
    # connect relevant signals
    qt.QObject.connect(
      self.widget,qt.SIGNAL("clicked()"),self.value_changed)

  def read(self):
    "Get button status"
    return self.widget.isChecked()

  def write(self,value):
    "Set button status"
    self.widget.setChecked(value)


class TreeView(ListTreeView):
  "Qt3 tree view not supported"

  def __init__(self):
    pass

  def read(self):
    "Get values displayed by widget"
    # get head
    head = map(lambda col_num: str(self.widget.columnText(col_num)),
      range(self.widget.columns()))
    # get data rows
    body = {}
    # recursive depth first tree data node reader
    def read_node(node,node_path):
      row = []
      for col_num in range(self.cols_num):
        try:
            row.append(self.row_types[col_num](node.text(col_num)))
        except:
          if self.row_types[col_num] == int:
            row.append(0)
          elif self.row_types[col_num] == float:
            row.append(0.0)
      body[string.join(map(str,node_path),'.')] = row
      child = node.firstChild()
      if child:
        read_node(child,node_path+[1])
      sibling = node.nextSibling() 
      while sibling:
        node_path[-1] += 1
        read_node(sibling,node_path)
        sibling = sibling.nextSibling()
    node = self.widget.firstChild()
    if node:
      read_node(node,[1])
    # return
    return {'head': head,'body': body}

  def write_head(self,head):
    map(self.widget.setColumnText,range(self.widget.columns()),head)

  def root_node(self):
    "Return the root node of the tree"
    return self.widget

  def add_node(self,parent,last_node,current_depth,data):
    "Add current node to the tree"
    return qt.QListViewItem(*[parent,last_node] + map(str,data))
 
#### END