# Source code for pyqtgraph.parametertree.parameterTypes

    from ..Qt import QtCore, QtGui
    from ..python2_3 import asUnicode
    from .Parameter import Parameter, registerParameterType
    from .ParameterItem import ParameterItem
    from ..widgets.SpinBox import SpinBox
    from ..widgets.ColorButton import ColorButton
    #from ..widgets.GradientWidget import GradientWidget ## creates import loop
    from .. import pixmaps as pixmaps
    from .. import functions as fn
    import os
    from ..pgcollections import OrderedDict

    class WidgetParameterItem(ParameterItem):
        """
        ParameterTree item with:

        * label in second column for displaying value
        * simple widget for editing value (displayed instead of label when item is selected)
        * button that resets value to default

        ==========================  =============================================================
        **Registered Types:**
        int                         Displays a :class:`SpinBox <pyqtgraph.SpinBox>` in integer
                                    mode.
        float                       Displays a :class:`SpinBox <pyqtgraph.SpinBox>`.
        bool                        Displays a QCheckBox
        str                         Displays a QLineEdit
        color                       Displays a :class:`ColorButton <pyqtgraph.ColorButton>`
        colormap                    Displays a :class:`GradientWidget <pyqtgraph.GradientWidget>`
        ==========================  =============================================================

        This class can be subclassed by overriding makeWidget() to provide a custom widget.
        """
        def __init__(self, param, depth):
            ParameterItem.__init__(self, param, depth)

            self.hideWidget = True  ## hide edit widget, replace with label when not selected
                                    ## set this to False to keep the editor widget always visible

            ## build widget into column 1 with a display label and default button.
            w = self.makeWidget()
            self.widget = w
            self.eventProxy = EventProxy(w, self.widgetEventFilter)

            opts = self.param.opts
            if 'tip' in opts:
                w.setToolTip(opts['tip'])

            self.defaultBtn = QtGui.QPushButton()
            self.defaultBtn.setFixedWidth(20)
            self.defaultBtn.setFixedHeight(20)
            modDir = os.path.dirname(__file__)
            self.defaultBtn.setIcon(QtGui.QIcon(pixmaps.getPixmap('default')))
            self.defaultBtn.clicked.connect(self.defaultClicked)

            self.displayLabel = QtGui.QLabel()

            layout = QtGui.QHBoxLayout()
            layout.setContentsMargins(0, 0, 0, 0)
            layout.setSpacing(2)
            layout.addWidget(w)
            layout.addWidget(self.displayLabel)
            layout.addWidget(self.defaultBtn)
            self.layoutWidget = QtGui.QWidget()
            self.layoutWidget.setLayout(layout)

            if w.sigChanged is not None:
                w.sigChanged.connect(self.widgetValueChanged)

            if hasattr(w, 'sigChanging'):
                w.sigChanging.connect(self.widgetValueChanging)

            ## update value shown in widget.
            if opts.get('value', None) is not None:
                self.valueChanged(self, opts['value'], force=True)
            else:
                ## no starting value was given; use whatever the widget has
                self.widgetValueChanged()

            self.updateDefaultBtn()

        def makeWidget(self):
            """
            Return a single widget that should be placed in the second tree column.
            The widget must be given three attributes:

            ==========  ============================================================
            sigChanged  a signal that is emitted when the widget's value is changed
            value       a function that returns the value
            setValue    a function that sets the value
            ==========  ============================================================

            This is a good function to override in subclasses.
            """
            opts = self.param.opts
            t = opts['type']
            if t in ('int', 'float'):
                defs = {
                    'value': 0, 'min': None, 'max': None,
                    'step': 1.0, 'dec': False,
                    'siPrefix': False, 'suffix': '', 'decimals': 3,
                }
                if t == 'int':
                    defs['int'] = True
                    defs['minStep'] = 1.0
                for k in defs:
                    if k in opts:
                        defs[k] = opts[k]
                if 'limits' in opts:
                    defs['bounds'] = opts['limits']
                w = SpinBox()
                w.setOpts(**defs)
                w.sigChanged = w.sigValueChanged
                w.sigChanging = w.sigValueChanging
            elif t == 'bool':
                w = QtGui.QCheckBox()
                w.sigChanged = w.toggled
                w.value = w.isChecked
                w.setValue = w.setChecked
                w.setEnabled(not opts.get('readonly', False))
                self.hideWidget = False
            elif t == 'str':
                w = QtGui.QLineEdit()
                w.sigChanged = w.editingFinished
                w.value = lambda: asUnicode(w.text())
                w.setValue = lambda v: w.setText(asUnicode(v))
                w.sigChanging = w.textChanged
            elif t == 'color':
                w = ColorButton()
                w.sigChanged = w.sigColorChanged
                w.sigChanging = w.sigColorChanging
                w.value = w.color
                w.setValue = w.setColor
                self.hideWidget = False
                w.setFlat(True)
                w.setEnabled(not opts.get('readonly', False))
            elif t == 'colormap':
                from ..widgets.GradientWidget import GradientWidget ## need this here to avoid import loop
                w = GradientWidget(orientation='bottom')
                w.sigChanged = w.sigGradientChangeFinished
                w.sigChanging = w.sigGradientChanged
                w.value = w.colorMap
                w.setValue = w.setColorMap
                self.hideWidget = False
            else:
                raise Exception("Unknown type '%s'" % asUnicode(t))
            return w

        def widgetEventFilter(self, obj, ev):
            ## filter widget's events
            ## catch TAB to change focus
            ## catch focusOut to hide editor
            if ev.type() == ev.KeyPress:
                if ev.key() == QtCore.Qt.Key_Tab:
                    self.focusNext(forward=True)
                    return True ## don't let anyone else see this event
                elif ev.key() == QtCore.Qt.Key_Backtab:
                    self.focusNext(forward=False)
                    return True ## don't let anyone else see this event

            #elif ev.type() == ev.FocusOut:
                #self.hideEditor()
            return False

        def setFocus(self):
            self.showEditor()

        def isFocusable(self):
            return self.param.writable()

        def valueChanged(self, param, val, force=False):
            ## called when the parameter's value has changed
            ParameterItem.valueChanged(self, param, val)
            self.widget.sigChanged.disconnect(self.widgetValueChanged)
            try:
                if force or val != self.widget.value():
                    self.widget.setValue(val)
                self.updateDisplayLabel(val)  ## always make sure label is updated, even if values match!
            finally:
                self.widget.sigChanged.connect(self.widgetValueChanged)
            self.updateDefaultBtn()

        def updateDefaultBtn(self):
            ## enable/disable default btn
            self.defaultBtn.setEnabled(not self.param.valueIsDefault() and self.param.writable())

            # hide / show
            self.defaultBtn.setVisible(not self.param.readonly())

        def updateDisplayLabel(self, value=None):
            """Update the display label to reflect the value of the parameter."""
            if value is None:
                value = self.param.value()
            opts = self.param.opts
            if isinstance(self.widget, QtGui.QAbstractSpinBox):
                text = asUnicode(self.widget.lineEdit().text())
            elif isinstance(self.widget, QtGui.QComboBox):
                text = self.widget.currentText()
            else:
                text = asUnicode(value)
            self.displayLabel.setText(text)

        def widgetValueChanged(self):
            ## called when the widget's value has been changed by the user
            val = self.widget.value()
            newVal = self.param.setValue(val)

        def widgetValueChanging(self, *args):
            """
            Called when the widget's value is changing, but not finalized.
            For example: editing text before pressing enter or changing focus.
            """
            # This is a bit sketchy: assume the last argument of each signal is
            # the value..
            self.param.sigValueChanging.emit(self.param, args[-1])

        def selected(self, sel):
            """Called when this item has been selected (sel=True) OR deselected (sel=False)"""
            ParameterItem.selected(self, sel)

            if self.widget is None:
                return
            if sel and self.param.writable():
                self.showEditor()
            elif self.hideWidget:
                self.hideEditor()

        def showEditor(self):
            self.widget.show()
            self.displayLabel.hide()
            self.widget.setFocus(QtCore.Qt.OtherFocusReason)
            if isinstance(self.widget, SpinBox):
                self.widget.selectNumber()  # select the numerical portion of the text for quick editing

        def hideEditor(self):
            self.widget.hide()
            self.displayLabel.show()

        def limitsChanged(self, param, limits):
            """Called when the parameter's limits have changed"""
            ParameterItem.limitsChanged(self, param, limits)

            t = self.param.opts['type']
            if t == 'int' or t == 'float':
                self.widget.setOpts(bounds=limits)
            else:
                return  ## don't know what to do with any other types..

        def defaultChanged(self, param, value):
            self.updateDefaultBtn()

        def treeWidgetChanged(self):
            """Called when this item is added or removed from a tree."""
            ParameterItem.treeWidgetChanged(self)

            ## add all widgets for this item into the tree
            if self.widget is not None:
                tree = self.treeWidget()
                if tree is None:
                    return
                tree.setItemWidget(self, 1, self.layoutWidget)
                self.displayLabel.hide()
                self.selected(False)

        def defaultClicked(self):
            self.param.setToDefault()

        def optsChanged(self, param, opts):
            """Called when any options are changed that are not
            name, value, default, or limits"""
            #print "opts changed:", opts
            ParameterItem.optsChanged(self, param, opts)

            if 'readonly' in opts:
                self.updateDefaultBtn()
                if isinstance(self.widget, (QtGui.QCheckBox,ColorButton)):
                    self.widget.setEnabled(not opts['readonly'])

            ## If widget is a SpinBox, pass options straight through
            if isinstance(self.widget, SpinBox):
                if 'units' in opts and 'suffix' not in opts:
                    opts['suffix'] = opts['units']
                self.widget.setOpts(**opts)
                self.updateDisplayLabel()

    class EventProxy(QtCore.QObject):
        def __init__(self, qobj, callback):
            QtCore.QObject.__init__(self)
            self.callback = callback
            qobj.installEventFilter(self)

        def eventFilter(self, obj, ev):
            return self.callback(obj, ev)

    class SimpleParameter(Parameter):
        itemClass = WidgetParameterItem

        def __init__(self, *args, **kargs):
            Parameter.__init__(self, *args, **kargs)

            ## override a few methods for color parameters
            if self.opts['type'] == 'color':
                self.value = self.colorValue
                self.saveState = self.saveColorState

        def colorValue(self):
            return fn.mkColor(Parameter.value(self))

        def saveColorState(self, *args, **kwds):
            state = Parameter.saveState(self, *args, **kwds)
            state['value'] = fn.colorTuple(self.value())
            return state

    registerParameterType('int', SimpleParameter, override=True)
    registerParameterType('float', SimpleParameter, override=True)
    registerParameterType('bool', SimpleParameter, override=True)
    registerParameterType('str', SimpleParameter, override=True)
    registerParameterType('color', SimpleParameter, override=True)
    registerParameterType('colormap', SimpleParameter, override=True)

    class GroupParameterItem(ParameterItem):
        """
        Group parameters are used mainly as a generic parent item that holds (and groups!) a set
        of child parameters. It also provides a simple mechanism for displaying a button or combo
        that can be used to add new parameters to the group.
        """
        def __init__(self, param, depth):
            ParameterItem.__init__(self, param, depth)
            self.updateDepth(depth)

            self.addItem = None
            if 'addText' in param.opts:
                addText = param.opts['addText']
                if 'addList' in param.opts:
                    self.addWidget = QtGui.QComboBox()
                    self.addWidget.setSizeAdjustPolicy(QtGui.QComboBox.AdjustToContents)
                    self.updateAddList()
                    self.addWidget.currentIndexChanged.connect(self.addChanged)
                else:
                    self.addWidget = QtGui.QPushButton(addText)
                    self.addWidget.clicked.connect(self.addClicked)
                w = QtGui.QWidget()
                l = QtGui.QHBoxLayout()
                l.setContentsMargins(0,0,0,0)
                w.setLayout(l)
                l.addWidget(self.addWidget)
                l.addStretch()
                #l.addItem(QtGui.QSpacerItem(200, 10, QtGui.QSizePolicy.Expanding, QtGui.QSizePolicy.Minimum))
                self.addWidgetBox = w
                self.addItem = QtGui.QTreeWidgetItem([])
                self.addItem.setFlags(QtCore.Qt.ItemIsEnabled)
                ParameterItem.addChild(self, self.addItem)

        def updateDepth(self, depth):
            ## Change item's appearance based on its depth in the tree
            ## This allows highest-level groups to be displayed more prominently.
            if depth == 0:
                for c in [0,1]:
                    self.setBackground(c, QtGui.QBrush(QtGui.QColor(100,100,100)))
                    self.setForeground(c, QtGui.QBrush(QtGui.QColor(220,220,255)))
                    font = self.font(c)
                    font.setBold(True)
                    font.setPointSize(font.pointSize()+1)
                    self.setFont(c, font)
                    self.setSizeHint(0, QtCore.QSize(0, 25))
            else:
                for c in [0,1]:
                    self.setBackground(c, QtGui.QBrush(QtGui.QColor(220,220,220)))
                    font = self.font(c)
                    font.setBold(True)
                    #font.setPointSize(font.pointSize()+1)
                    self.setFont(c, font)
                    self.setSizeHint(0, QtCore.QSize(0, 20))

        def addClicked(self):
            """Called when "add new" button is clicked
            The parameter MUST have an 'addNew' method defined.
            """
            self.param.addNew()

        def addChanged(self):
            """Called when "add new" combo is changed
            The parameter MUST have an 'addNew' method defined.
            """
            if self.addWidget.currentIndex() == 0:
                return
            typ = asUnicode(self.addWidget.currentText())
            self.param.addNew(typ)
            self.addWidget.setCurrentIndex(0)

        def treeWidgetChanged(self):
            ParameterItem.treeWidgetChanged(self)
            self.treeWidget().setFirstItemColumnSpanned(self, True)
            if self.addItem is not None:
                self.treeWidget().setItemWidget(self.addItem, 0, self.addWidgetBox)
                self.treeWidget().setFirstItemColumnSpanned(self.addItem, True)

        def addChild(self, child):  ## make sure added childs are actually inserted before add btn
            if self.addItem is not None:
                ParameterItem.insertChild(self, self.childCount()-1, child)
            else:
                ParameterItem.addChild(self, child)

        def optsChanged(self, param, changed):
            if 'addList' in changed:
                self.updateAddList()

        def updateAddList(self):
            self.addWidget.blockSignals(True)
            try:
                self.addWidget.clear()
                self.addWidget.addItem(self.param.opts['addText'])
                for t in self.param.opts['addList']:
                    self.addWidget.addItem(t)
            finally:
                self.addWidget.blockSignals(False)

    class GroupParameter(Parameter):
        """
        Group parameters are used mainly as a generic parent item that holds (and groups!) a set
        of child parameters.

        It also provides a simple mechanism for displaying a button or combo
        that can be used to add new parameters to the group. To enable this, the group
        must be initialized with the 'addText' option (the text will be displayed on
        a button which, when clicked, will cause addNew() to be called). If the 'addList'
        option is specified as well, then a dropdown-list of addable items will be displayed
        instead of a button.
        """
        itemClass = GroupParameterItem

        def addNew(self, typ=None):
            """
            This method is called when the user has requested to add a new item to the group.
            """
            raise Exception("Must override this function in subclass.")

        def setAddList(self, vals):
            """Change the list of options available for the user to add to the group."""
            self.setOpts(addList=vals)

    registerParameterType('group', GroupParameter, override=True)

    class ListParameterItem(WidgetParameterItem):
        """
        WidgetParameterItem subclass providing comboBox that lets the user select from a list of options.

        """
        def __init__(self, param, depth):
            self.targetValue = None
            WidgetParameterItem.__init__(self, param, depth)

        def makeWidget(self):
            opts = self.param.opts
            t = opts['type']
            w = QtGui.QComboBox()
            w.setMaximumHeight(20)  ## set to match height of spin box and line edit
            w.sigChanged = w.currentIndexChanged
            w.value = self.value
            w.setValue = self.setValue
            self.widget = w  ## needs to be set before limits are changed
            self.limitsChanged(self.param, self.param.opts['limits'])
            if len(self.forward) > 0:
                self.setValue(self.param.value())
            return w

        def value(self):
            key = asUnicode(self.widget.currentText())

            return self.forward.get(key, None)

        def setValue(self, val):
            self.targetValue = val
            if val not in self.reverse[0]:
                self.widget.setCurrentIndex(0)
            else:
                key = self.reverse[1][self.reverse[0].index(val)]
                ind = self.widget.findText(key)
                self.widget.setCurrentIndex(ind)

        def limitsChanged(self, param, limits):
            # set up forward / reverse mappings for name:value

            if len(limits) == 0:
                limits = ['']  ## Can never have an empty list--there is always at least a singhe blank item.

            self.forward, self.reverse = ListParameter.mapping(limits)
            try:
                self.widget.blockSignals(True)
                val = self.targetValue  #asUnicode(self.widget.currentText())

                self.widget.clear()
                for k in self.forward:
                    self.widget.addItem(k)
                    if k == val:
                        self.widget.setCurrentIndex(self.widget.count()-1)
                        self.updateDisplayLabel()
            finally:
                self.widget.blockSignals(False)

    class ListParameter(Parameter):
        itemClass = ListParameterItem

        def __init__(self, **opts):
            self.forward = OrderedDict()  ## {name: value, ...}
            self.reverse = ([], [])       ## ([value, ...], [name, ...])

            ## Parameter uses 'limits' option to define the set of allowed values
            if 'values' in opts:
                opts['limits'] = opts['values']
            if opts.get('limits', None) is None:
                opts['limits'] = []
            Parameter.__init__(self, **opts)
            self.setLimits(opts['limits'])

        def setLimits(self, limits):
            self.forward, self.reverse = self.mapping(limits)

            Parameter.setLimits(self, limits)
            if len(self.reverse[0]) > 0 and self.value() not in self.reverse[0]:
                self.setValue(self.reverse[0][0])

        #def addItem(self, name, value=None):
            #if name in self.forward:
                #raise Exception("Name '%s' is already in use for this parameter" % name)
            #limits = self.opts['limits']
            #if isinstance(limits, dict):
                #limits = limits.copy()
                #limits[name] = value
                #self.setLimits(limits)
            #else:
                #if value is not None:
                    #raise Exception  ## raise exception or convert to dict?
                #limits = limits[:]
                #limits.append(name)
            ## what if limits == None?

        @staticmethod
        def mapping(limits):
            ## Return forward and reverse mapping objects given a limit specification
            forward = OrderedDict()  ## {name: value, ...}
            reverse = ([], [])       ## ([value, ...], [name, ...])
            if isinstance(limits, dict):
                for k, v in limits.items():
                    forward[k] = v
                    reverse[0].append(v)
                    reverse[1].append(k)
            else:
                for v in limits:
                    n = asUnicode(v)
                    forward[n] = v
                    reverse[0].append(v)
                    reverse[1].append(n)
            return forward, reverse

    registerParameterType('list', ListParameter, override=True)

    class ActionParameterItem(ParameterItem):
        def __init__(self, param, depth):
            ParameterItem.__init__(self, param, depth)
            self.layoutWidget = QtGui.QWidget()
            self.layout = QtGui.QHBoxLayout()
            self.layoutWidget.setLayout(self.layout)
            self.button = QtGui.QPushButton(param.name())
            #self.layout.addSpacing(100)
            self.layout.addWidget(self.button)
            self.layout.addStretch()
            self.button.clicked.connect(self.buttonClicked)
            param.sigNameChanged.connect(self.paramRenamed)
            self.setText(0, '')

        def treeWidgetChanged(self):
            ParameterItem.treeWidgetChanged(self)
            tree = self.treeWidget()
            if tree is None:
                return

            tree.setFirstItemColumnSpanned(self, True)
            tree.setItemWidget(self, 0, self.layoutWidget)

        def paramRenamed(self, param, name):
            self.button.setText(name)

        def buttonClicked(self):
            self.param.activate()

    class ActionParameter(Parameter):
        """Used for displaying a button within the tree."""
        itemClass = ActionParameterItem
        sigActivated = QtCore.Signal(object)

        def activate(self):
            self.sigActivated.emit(self)
            self.emitStateChanged('activated', None)

    registerParameterType('action', ActionParameter, override=True)

    class TextParameterItem(WidgetParameterItem):
        def __init__(self, param, depth):
            WidgetParameterItem.__init__(self, param, depth)
            self.hideWidget = False
            self.subItem = QtGui.QTreeWidgetItem()
            self.addChild(self.subItem)

        def treeWidgetChanged(self):
            ## TODO: fix so that superclass method can be called
            ## (WidgetParameter should just natively support this style)
            #WidgetParameterItem.treeWidgetChanged(self)
            self.treeWidget().setFirstItemColumnSpanned(self.subItem, True)
            self.treeWidget().setItemWidget(self.subItem, 0, self.textBox)

            # for now, these are copied from ParameterItem.treeWidgetChanged
            self.setHidden(not self.param.opts.get('visible', True))
            self.setExpanded(self.param.opts.get('expanded', True))

        def makeWidget(self):
            self.textBox = QtGui.QTextEdit()
            self.textBox.setMaximumHeight(100)
            self.textBox.setReadOnly(self.param.opts.get('readonly', False))
            self.textBox.value = lambda: str(self.textBox.toPlainText())
            self.textBox.setValue = self.textBox.setPlainText
            self.textBox.sigChanged = self.textBox.textChanged
            return self.textBox

    class TextParameter(Parameter):
        """Editable string; displayed as large text box in the tree."""
        itemClass = TextParameterItem

    registerParameterType('text', TextParameter, override=True)