Python qtpy.QtWidgets.QComboBox() Examples

def test_model_item():
    """
    This is a regression test for an issue that caused the call to item(0)
    below to trigger segmentation faults in PySide. The issue is
    non-deterministic when running the call once, so we include a loop to make
    sure that we trigger the fault.
    """
    app = get_qapp()
    combo = QtWidgets.QComboBox()
    label_data = [('a', None)]
    for iter in range(10000):
        combo.clear()
        for i, (label, data) in enumerate(label_data):
            combo.addItem(label, userData=data)
        model = combo.model()
        model.item(0) 

def __init__(self, number, name, options, decimals=3):
        super(ListComboBox, self).__init__()
        self.setToolTip("First order filter frequencies \n"
                        "negative values are for high-pass \n"
                        "positive for low pass")
        self.lay = QtWidgets.QHBoxLayout()
        self.lay.setContentsMargins(0, 0, 0, 0)
        self.combos = []
        self.options = options
        self.decimals = decimals
        for i in range(number):
            combo = QtWidgets.QComboBox()
            self.combos.append(combo)
            combo.addItems(self.options)
            combo.currentIndexChanged.connect(self.value_changed)
            self.lay.addWidget(combo)
        self.setLayout(self.lay) 

def __init__(self, layout: QtWidgets.QLayout, text: str, values: Sequence):
        """ A combo box widget with a label

        Args:
            layout: the layout to which to add the widget
            text: the label text
            values: the possible values of the combo box
        """
        QtWidgets.QWidget.__init__(self)
        layout.addWidget(self)
        self.layout = QtWidgets.QHBoxLayout(self)
        self.label = QtWidgets.QLabel(text)
        self.layout.addWidget(self.label)
        self.layout.setContentsMargins(0, 0, 0, 0)

        self.values = values

        self.input1 = QtWidgets.QComboBox()
        self.input1.addItems(values)
        self.layout.addWidget(self.input1)

        self.input1.currentIndexChanged.connect(self.valueChangeEvent)
        self.layout.addWidget(self.input1) 

def test_model_item():
    """
    This is a regression test for an issue that caused the call to item(0)
    below to trigger segmentation faults in PySide. The issue is
    non-deterministic when running the call once, so we include a loop to make
    sure that we trigger the fault.
    """
    app = get_qapp()
    combo = QtWidgets.QComboBox()
    label_data = [('a', None)]
    for iter in range(10000):
        combo.clear()
        for i, (label, data) in enumerate(label_data):
            combo.addItem(label, userData=data)
        model = combo.model()
        model.item(0) 

def test_model_item():
    """
    This is a regression test for an issue that caused the call to item(0)
    below to trigger segmentation faults in PySide. The issue is
    non-deterministic when running the call once, so we include a loop to make
    sure that we trigger the fault.
    """
    app = get_qapp()
    combo = QtWidgets.QComboBox()
    label_data = [('a', None)]
    for iter in range(10000):
        combo.clear()
        for i, (label, data) in enumerate(label_data):
            combo.addItem(label, userData=data)
        model = combo.model()
        model.item(0) 

def test_model_item():
    """
    This is a regression test for an issue that caused the call to item(0)
    below to trigger segmentation faults in PySide. The issue is
    non-deterministic when running the call once, so we include a loop to make
    sure that we trigger the fault.
    """
    app = get_qapp()
    combo = QtWidgets.QComboBox()
    label_data = [('a', None)]
    for iter in range(10000):
        combo.clear()
        for i, (label, data) in enumerate(label_data):
            combo.addItem(label, userData=data)
        model = combo.model()
        model.item(0) 

def _make_widget(self):
        """
        Sets up the widget (here a QComboBox)

        :return:
        """
        self.widget = QtWidgets.QListWidget()
        self.widget.addItems(self.options)
        self.widget.currentItemChanged.connect(self.write_widget_value_to_attribute) 

def _make_widget(self):
        self.widget = QtWidgets.QComboBox()
        self.widget.addItems(self.options)
        self.widget.currentIndexChanged.connect(self.write_widget_value_to_attribute) 

def test_load_ui():
    """
    Make sure that the patched loadUi function behaves as expected with a
    simple .ui file.
    """
    app = get_qapp()
    ui = loadUi(os.path.join(os.path.dirname(__file__), 'test.ui'))
    assert isinstance(ui.pushButton, QtWidgets.QPushButton)
    assert isinstance(ui.comboBox, QComboBox) 

def enabled_qcombobox_subclass(tmpdir):
    """
    Context manager that sets up a temporary module with a QComboBox subclass
    and then removes it once we are done.
    """

    with open(tmpdir.join('qcombobox_subclass.py').strpath, 'w') as f:
        f.write(QCOMBOBOX_SUBCLASS)

    sys.path.insert(0, tmpdir.strpath)

    yield

    sys.path.pop(0) 

def add_custom_color(color_box: QComboBox, color: QColor):
    rgb_str = f"({color.red()}, {color.green()}, {color.blue()})"
    color_box.addItem(color_icon(rgb_str), rgb_str)
    color_box.setCurrentIndex(color_box.count() - 1) 

def set_custom_color(color_box: QComboBox, color_text: str):
    color_index = color_box.findText(color_text)
    if color_index > -1:
        color_box.setCurrentIndex(color_index)
    else:
        color_box.addItem(color_icon(color_text), color_text)
        color_box.setCurrentIndex(color_box.count() - 1) 

def test_load_ui():
    """
    Make sure that the patched loadUi function behaves as expected with a
    simple .ui file.
    """
    app = get_qapp()
    ui = loadUi(os.path.join(os.path.dirname(__file__), 'test.ui'))
    assert isinstance(ui.pushButton, QtWidgets.QPushButton)
    assert isinstance(ui.comboBox, QComboBox) 

def enabled_qcombobox_subclass(tmpdir):
    """
    Context manager that sets up a temporary module with a QComboBox subclass
    and then removes it once we are done.
    """

    with open(tmpdir.join('qcombobox_subclass.py').strpath, 'w') as f:
        f.write(QCOMBOBOX_SUBCLASS)

    sys.path.insert(0, tmpdir.strpath)

    yield

    sys.path.pop(0) 

def test_load_ui():
    """
    Make sure that the patched loadUi function behaves as expected with a
    simple .ui file.
    """
    app = get_qapp()
    ui = loadUi(os.path.join(os.path.dirname(__file__), 'test.ui'))
    assert isinstance(ui.pushButton, QtWidgets.QPushButton)
    assert isinstance(ui.comboBox, QComboBox) 

def enabled_qcombobox_subclass(tmpdir):
    """
    Context manager that sets up a temporary module with a QComboBox subclass
    and then removes it once we are done.
    """

    with open(tmpdir.join('qcombobox_subclass.py').strpath, 'w') as f:
        f.write(QCOMBOBOX_SUBCLASS)

    sys.path.insert(0, tmpdir.strpath)

    yield

    sys.path.pop(0) 

def test_load_ui():
    """
    Make sure that the patched loadUi function behaves as expected with a
    simple .ui file.
    """
    app = get_qapp()
    ui = loadUi(os.path.join(os.path.dirname(__file__), 'test.ui'))
    assert isinstance(ui.pushButton, QtWidgets.QPushButton)
    assert isinstance(ui.comboBox, QComboBox) 

def enabled_qcombobox_subclass(tmpdir):
    """
    Context manager that sets up a temporary module with a QComboBox subclass
    and then removes it once we are done.
    """

    with open(tmpdir.join('qcombobox_subclass.py').strpath, 'w') as f:
        f.write(QCOMBOBOX_SUBCLASS)

    sys.path.insert(0, tmpdir.strpath)

    yield

    sys.path.pop(0) 

def test_load_ui():
    """
    Make sure that the patched loadUi function behaves as expected with a
    simple .ui file.
    """
    app = get_qapp()
    ui = loadUi(os.path.join(os.path.dirname(__file__), 'test.ui'))
    assert isinstance(ui.pushButton, QtWidgets.QPushButton)
    assert isinstance(ui.comboBox, QComboBox) 

def enabled_qcombobox_subclass(tmpdir):
    """
    Context manager that sets up a temporary module with a QComboBox subclass
    and then removes it once we are done.
    """

    with open(tmpdir.join('qcombobox_subclass.py').strpath, 'w') as f:
        f.write(QCOMBOBOX_SUBCLASS)

    sys.path.insert(0, tmpdir.strpath)

    yield

    sys.path.pop(0) 

def test_patched_qcombobox():
    """
    In PySide, using Python objects as userData in QComboBox causes
    Segmentation faults under certain conditions. Even in cases where it
    doesn't, findData does not work correctly. Likewise, findData also
    does not work correctly with Python objects when using PyQt4. On the
    other hand, PyQt5 deals with this case correctly. We therefore patch
    QComboBox when using PyQt4 and PySide to avoid issues.
    """

    app = get_qapp()

    data1 = Data()
    data2 = Data()
    data3 = Data()
    data4 = Data()
    data5 = Data()
    data6 = Data()

    icon1 = QtGui.QIcon()
    icon2 = QtGui.QIcon()

    widget = QtWidgets.QComboBox()
    widget.addItem('a', data1)
    widget.insertItem(0, 'b', data2)
    widget.addItem('c', data1)
    widget.setItemData(2, data3)
    widget.addItem(icon1, 'd', data4)
    widget.insertItem(3, icon2, 'e', data5)
    widget.addItem(icon1, 'f')
    widget.insertItem(5, icon2, 'g')

    widget.show()

    assert widget.findData(data1) == 1
    assert widget.findData(data2) == 0
    assert widget.findData(data3) == 2
    assert widget.findData(data4) == 4
    assert widget.findData(data5) == 3
    assert widget.findData(data6) == -1

    assert widget.itemData(0) == data2
    assert widget.itemData(1) == data1
    assert widget.itemData(2) == data3
    assert widget.itemData(3) == data5
    assert widget.itemData(4) == data4
    assert widget.itemData(5) is None
    assert widget.itemData(6) is None

    assert widget.itemText(0) == 'b'
    assert widget.itemText(1) == 'a'
    assert widget.itemText(2) == 'c'
    assert widget.itemText(3) == 'e'
    assert widget.itemText(4) == 'd'
    assert widget.itemText(5) == 'g'
    assert widget.itemText(6) == 'f' 

def test_patched_qcombobox():
    """
    In PySide, using Python objects as userData in QComboBox causes
    Segmentation faults under certain conditions. Even in cases where it
    doesn't, findData does not work correctly. Likewise, findData also
    does not work correctly with Python objects when using PyQt4. On the
    other hand, PyQt5 deals with this case correctly. We therefore patch
    QComboBox when using PyQt4 and PySide to avoid issues.
    """

    app = get_qapp()

    data1 = Data()
    data2 = Data()
    data3 = Data()
    data4 = Data()
    data5 = Data()
    data6 = Data()

    icon1 = QtGui.QIcon()
    icon2 = QtGui.QIcon()

    widget = QtWidgets.QComboBox()
    widget.addItem('a', data1)
    widget.insertItem(0, 'b', data2)
    widget.addItem('c', data1)
    widget.setItemData(2, data3)
    widget.addItem(icon1, 'd', data4)
    widget.insertItem(3, icon2, 'e', data5)
    widget.addItem(icon1, 'f')
    widget.insertItem(5, icon2, 'g')

    widget.show()

    assert widget.findData(data1) == 1
    assert widget.findData(data2) == 0
    assert widget.findData(data3) == 2
    assert widget.findData(data4) == 4
    assert widget.findData(data5) == 3
    assert widget.findData(data6) == -1

    assert widget.itemData(0) == data2
    assert widget.itemData(1) == data1
    assert widget.itemData(2) == data3
    assert widget.itemData(3) == data5
    assert widget.itemData(4) == data4
    assert widget.itemData(5) is None
    assert widget.itemData(6) is None

    assert widget.itemText(0) == 'b'
    assert widget.itemText(1) == 'a'
    assert widget.itemText(2) == 'c'
    assert widget.itemText(3) == 'e'
    assert widget.itemText(4) == 'd'
    assert widget.itemText(5) == 'g'
    assert widget.itemText(6) == 'f' 

def test_patched_qcombobox():
    """
    In PySide, using Python objects as userData in QComboBox causes
    Segmentation faults under certain conditions. Even in cases where it
    doesn't, findData does not work correctly. Likewise, findData also
    does not work correctly with Python objects when using PyQt4. On the
    other hand, PyQt5 deals with this case correctly. We therefore patch
    QComboBox when using PyQt4 and PySide to avoid issues.
    """

    app = get_qapp()

    data1 = Data()
    data2 = Data()
    data3 = Data()
    data4 = Data()
    data5 = Data()
    data6 = Data()

    icon1 = QtGui.QIcon()
    icon2 = QtGui.QIcon()

    widget = QtWidgets.QComboBox()
    widget.addItem('a', data1)
    widget.insertItem(0, 'b', data2)
    widget.addItem('c', data1)
    widget.setItemData(2, data3)
    widget.addItem(icon1, 'd', data4)
    widget.insertItem(3, icon2, 'e', data5)
    widget.addItem(icon1, 'f')
    widget.insertItem(5, icon2, 'g')

    widget.show()

    assert widget.findData(data1) == 1
    assert widget.findData(data2) == 0
    assert widget.findData(data3) == 2
    assert widget.findData(data4) == 4
    assert widget.findData(data5) == 3
    assert widget.findData(data6) == -1

    assert widget.itemData(0) == data2
    assert widget.itemData(1) == data1
    assert widget.itemData(2) == data3
    assert widget.itemData(3) == data5
    assert widget.itemData(4) == data4
    assert widget.itemData(5) is None
    assert widget.itemData(6) is None

    assert widget.itemText(0) == 'b'
    assert widget.itemText(1) == 'a'
    assert widget.itemText(2) == 'c'
    assert widget.itemText(3) == 'e'
    assert widget.itemText(4) == 'd'
    assert widget.itemText(5) == 'g'
    assert widget.itemText(6) == 'f' 

def test_patched_qcombobox():
    """
    In PySide, using Python objects as userData in QComboBox causes
    Segmentation faults under certain conditions. Even in cases where it
    doesn't, findData does not work correctly. Likewise, findData also
    does not work correctly with Python objects when using PyQt4. On the
    other hand, PyQt5 deals with this case correctly. We therefore patch
    QComboBox when using PyQt4 and PySide to avoid issues.
    """

    app = get_qapp()

    data1 = Data()
    data2 = Data()
    data3 = Data()
    data4 = Data()
    data5 = Data()
    data6 = Data()

    icon1 = QtGui.QIcon()
    icon2 = QtGui.QIcon()

    widget = QtWidgets.QComboBox()
    widget.addItem('a', data1)
    widget.insertItem(0, 'b', data2)
    widget.addItem('c', data1)
    widget.setItemData(2, data3)
    widget.addItem(icon1, 'd', data4)
    widget.insertItem(3, icon2, 'e', data5)
    widget.addItem(icon1, 'f')
    widget.insertItem(5, icon2, 'g')

    widget.show()

    assert widget.findData(data1) == 1
    assert widget.findData(data2) == 0
    assert widget.findData(data3) == 2
    assert widget.findData(data4) == 4
    assert widget.findData(data5) == 3
    assert widget.findData(data6) == -1

    assert widget.itemData(0) == data2
    assert widget.itemData(1) == data1
    assert widget.itemData(2) == data3
    assert widget.itemData(3) == data5
    assert widget.itemData(4) == data4
    assert widget.itemData(5) is None
    assert widget.itemData(6) is None

    assert widget.itemText(0) == 'b'
    assert widget.itemText(1) == 'a'
    assert widget.itemText(2) == 'c'
    assert widget.itemText(3) == 'e'
    assert widget.itemText(4) == 'd'
    assert widget.itemText(5) == 'g'
    assert widget.itemText(6) == 'f' 

def __init__(self, layer):
        super().__init__()

        self.events = EmitterGroup(
            source=self,
            auto_connect=False,
            blending=Event,
            opacity=Event,
            status=Event,
        )

        # When the EVH refactor #1376 is done we might not even need the layer
        # attribute anymore as all data updates will be through the handler.
        # At that point we could remove the attribute and do the registering
        # and connecting outside this class and never even need to pass the
        # layer to this class.
        self.layer = layer
        self.layer.event_handler.register_listener(self)
        self.events.connect(self.layer.event_handler.on_change)

        self.setObjectName('layer')
        self.setMouseTracking(True)

        self.grid_layout = QGridLayout(self)
        self.grid_layout.setContentsMargins(0, 0, 0, 0)
        self.grid_layout.setSpacing(2)
        self.grid_layout.setColumnMinimumWidth(0, 86)
        self.grid_layout.setColumnStretch(1, 1)
        self.setLayout(self.grid_layout)

        sld = QSlider(Qt.Horizontal, parent=self)
        sld.setFocusPolicy(Qt.NoFocus)
        sld.setMinimum(0)
        sld.setMaximum(100)
        sld.setSingleStep(1)
        sld.valueChanged.connect(lambda v: self.events.opacity(v / 100))
        self.opacitySlider = sld

        blend_comboBox = QComboBox(self)
        blend_comboBox.addItems(Blending.keys())
        blend_comboBox.activated[str].connect(self.events.blending)
        self.blendComboBox = blend_comboBox

        # Once EVH refactor is done, these can be moved to an initialization
        # outside of this object
        self._on_opacity_change(self.layer.opacity)
        self._on_blending_change(self.layer.blending) 

def __init__(self, layer):
        super().__init__(layer)

        self.events.add(
            colormap=Event,
            contrast_limits=Event,
            contrast_limits_range=Event,
            gamma=Event,
        )

        comboBox = QComboBox(self)
        comboBox.setObjectName("colormapComboBox")
        comboBox.activated[str].connect(self.events.colormap)
        self.colormapComboBox = comboBox

        # Create contrast_limits slider
        self.contrastLimitsSlider = QHRangeSlider(parent=self)
        self.contrastLimitsSlider.mousePressEvent = self._clim_mousepress
        self.contrastLimitsSlider.valuesChanged.connect(
            self.events.contrast_limits
        )
        self.contrastLimitsSlider.rangeChanged.connect(
            self.events.contrast_limits_range
        )

        # gamma slider
        sld = QSlider(Qt.Horizontal, parent=self)
        sld.setFocusPolicy(Qt.NoFocus)
        sld.setMinimum(2)
        sld.setMaximum(200)
        sld.setSingleStep(2)
        sld.setValue(100)
        sld.valueChanged.connect(lambda value: self.events.gamma(value / 100))
        self.gammaSlider = sld

        self.colorbarLabel = QLabel(parent=self)
        self.colorbarLabel.setObjectName('colorbar')
        self.colorbarLabel.setToolTip('Colorbar')

        # Once EVH refactor is done, these can be moved to an initialization
        # outside of this object
        self._on_gamma_change(self.layer.gamma)
        self._set_colormaps(self.layer.colormaps)
        self._on_colormap_change(self.layer.colormap[0])
        self._on_contrast_limits_range_change(self.layer.contrast_limits_range)
        self._on_contrast_limits_change(self.layer.contrast_limits) 

def test_patched_qcombobox():
    """
    In PySide, using Python objects as userData in QComboBox causes
    Segmentation faults under certain conditions. Even in cases where it
    doesn't, findData does not work correctly. Likewise, findData also
    does not work correctly with Python objects when using PyQt4. On the
    other hand, PyQt5 deals with this case correctly. We therefore patch
    QComboBox when using PyQt4 and PySide to avoid issues.
    """

    app = get_qapp()

    data1 = Data()
    data2 = Data()
    data3 = Data()
    data4 = Data()
    data5 = Data()
    data6 = Data()

    icon1 = QtGui.QIcon()
    icon2 = QtGui.QIcon()

    widget = QtWidgets.QComboBox()
    widget.addItem('a', data1)
    widget.insertItem(0, 'b', data2)
    widget.addItem('c', data1)
    widget.setItemData(2, data3)
    widget.addItem(icon1, 'd', data4)
    widget.insertItem(3, icon2, 'e', data5)
    widget.addItem(icon1, 'f')
    widget.insertItem(5, icon2, 'g')

    widget.show()

    assert widget.findData(data1) == 1
    assert widget.findData(data2) == 0
    assert widget.findData(data3) == 2
    assert widget.findData(data4) == 4
    assert widget.findData(data5) == 3
    assert widget.findData(data6) == -1

    assert widget.itemData(0) == data2
    assert widget.itemData(1) == data1
    assert widget.itemData(2) == data3
    assert widget.itemData(3) == data5
    assert widget.itemData(4) == data4
    assert widget.itemData(5) is None
    assert widget.itemData(6) is None

    assert widget.itemText(0) == 'b'
    assert widget.itemText(1) == 'a'
    assert widget.itemText(2) == 'c'
    assert widget.itemText(3) == 'e'
    assert widget.itemText(4) == 'd'
    assert widget.itemText(5) == 'g'
    assert widget.itemText(6) == 'f'