class QtLayerList(QScrollArea):
def __init__(self, layers):
super().__init__()
self.layers = layers
self.setWidgetResizable(True)
self.setHorizontalScrollBarPolicy(Qt.ScrollBarAlwaysOff)
scrollWidget = QWidget()
self.setWidget(scrollWidget)
self.vbox_layout = QVBoxLayout(scrollWidget)
self.vbox_layout.addWidget(QtDivider())
self.vbox_layout.addStretch(1)
self.vbox_layout.setContentsMargins(0, 0, 0, 0)
self.vbox_layout.setSpacing(2)
self.centers = []
# Create a timer to be used for autoscrolling the layers list up and
# down when dragging a layer near the end of the displayed area
self.dragTimer = QTimer()
self.dragTimer.setSingleShot(False)
self.dragTimer.setInterval(20)
self.dragTimer.timeout.connect(self._force_scroll)
self._scroll_up = True
self._min_scroll_region = 24
self.setAcceptDrops(True)
self.setToolTip('Layer list')
self.setSizePolicy(QSizePolicy.Fixed, QSizePolicy.Expanding)
self.layers.events.added.connect(self._add)
self.layers.events.removed.connect(self._remove)
self.layers.events.reordered.connect(self._reorder)
self.drag_start_position = np.zeros(2)
self.drag_name = None
def _add(self, event):
"""Insert widget for layer `event.item` at index `event.index`."""
layer = event.item
total = len(self.layers)
index = 2 * (total - event.index) - 1
widget = QtLayerWidget(layer)
self.vbox_layout.insertWidget(index, widget)
self.vbox_layout.insertWidget(index + 1, QtDivider())
layer.events.select.connect(self._scroll_on_select)
def _remove(self, event):
"""Remove widget for layer at index `event.index`."""
layer_index = event.index
total = len(self.layers)
# Find property widget and divider for layer to be removed
index = 2 * (total - layer_index) + 1
widget = self.vbox_layout.itemAt(index).widget()
divider = self.vbox_layout.itemAt(index + 1).widget()
self.vbox_layout.removeWidget(widget)
widget.deleteLater()
self.vbox_layout.removeWidget(divider)
divider.deleteLater()
def _reorder(self, event=None):
"""Reorders list of layer widgets by looping through all
widgets in list sequentially removing them and inserting
them into the correct place in final list.
"""
total = len(self.layers)
# Create list of the current property and divider widgets
widgets = [
self.vbox_layout.itemAt(i + 1).widget() for i in range(2 * total)
]
# Take every other widget to ignore the dividers and get just the
# property widgets
indices = [
self.layers.index(w.layer)
for i, w in enumerate(widgets)
if i % 2 == 0
]
# Move through the layers in order
for i in range(total):
# Find index of property widget in list of the current layer
index = 2 * indices.index(i)
widget = widgets[index]
divider = widgets[index + 1]
# Check if current index does not match new index
index_current = self.vbox_layout.indexOf(widget)
index_new = 2 * (total - i) - 1
if index_current != index_new:
# Remove that property widget and divider
self.vbox_layout.removeWidget(widget)
self.vbox_layout.removeWidget(divider)
# Insert the property widget and divider into new location
self.vbox_layout.insertWidget(index_new, widget)
self.vbox_layout.insertWidget(index_new + 1, divider)
def _force_scroll(self):
"""Force the scroll bar to automattically scroll either up or down."""
cur_value = self.verticalScrollBar().value()
if self._scroll_up:
new_value = cur_value - self.verticalScrollBar().singleStep() / 4
if new_value < 0:
new_value = 0
self.verticalScrollBar().setValue(new_value)
else:
new_value = cur_value + self.verticalScrollBar().singleStep() / 4
if new_value > self.verticalScrollBar().maximum():
new_value = self.verticalScrollBar().maximum()
self.verticalScrollBar().setValue(new_value)
def _scroll_on_select(self, event):
"""Scroll to ensure that the currently selected layer is visible."""
layer = event.source
self._ensure_visible(layer)
def _ensure_visible(self, layer):
"""Ensure layer widget for at particular layer is visible."""
total = len(self.layers)
layer_index = self.layers.index(layer)
# Find property widget and divider for layer to be removed
index = 2 * (total - layer_index) - 1
widget = self.vbox_layout.itemAt(index).widget()
self.ensureWidgetVisible(widget)
def keyPressEvent(self, event):
event.ignore()
def keyReleaseEvent(self, event):
event.ignore()
def mousePressEvent(self, event):
# Check if mouse press happens on a layer properties widget or
# a child of such a widget. If not, the press has happended on the
# Layers Widget itself and should be ignored.
widget = self.childAt(event.pos())
layer = (
getattr(widget, 'layer', None)
or getattr(widget.parentWidget(), 'layer', None)
or getattr(widget.parentWidget().parentWidget(), 'layer', None)
)
if layer is not None:
self.drag_start_position = np.array(
[event.pos().x(), event.pos().y()]
)
self.drag_name = layer.name
else:
self.drag_name = None
def mouseReleaseEvent(self, event):
if self.drag_name is None:
# Unselect all the layers if not dragging a layer
self.layers.unselect_all()
return
modifiers = event.modifiers()
layer = self.layers[self.drag_name]
if modifiers == Qt.ShiftModifier:
# If shift select all layers in between currently selected one and
# clicked one
index = self.layers.index(layer)
lastSelected = None
for i in range(len(self.layers)):
if self.layers[i].selected:
lastSelected = i
r = [index, lastSelected]
r.sort()
for i in range(r[0], r[1] + 1):
self.layers[i].selected = True
elif modifiers == Qt.ControlModifier:
# If control click toggle selected state
layer.selected = not layer.selected
else:
# If otherwise unselect all and leave clicked one selected
self.layers.unselect_all(ignore=layer)
layer.selected = True
def mouseMoveEvent(self, event):
position = np.array([event.pos().x(), event.pos().y()])
distance = np.linalg.norm(position - self.drag_start_position)
if (
distance < QApplication.startDragDistance()
or self.drag_name is None
):
return
mimeData = QMimeData()
mimeData.setText(self.drag_name)
drag = QDrag(self)
drag.setMimeData(mimeData)
drag.setHotSpot(event.pos() - self.rect().topLeft())
drag.exec_()
if self.drag_name is not None:
index = self.layers.index(self.drag_name)
layer = self.layers[index]
self._ensure_visible(layer)
def dragLeaveEvent(self, event):
"""Unselects layer dividers."""
event.ignore()
self.dragTimer.stop()
for i in range(0, self.vbox_layout.count(), 2):
self.vbox_layout.itemAt(i).widget().setSelected(False)
def dragEnterEvent(self, event):
if event.source() == self:
event.accept()
divs = []
for i in range(0, self.vbox_layout.count(), 2):
widget = self.vbox_layout.itemAt(i).widget()
divs.append(widget.y() + widget.frameGeometry().height() / 2)
self.centers = [
(divs[i + 1] + divs[i]) / 2 for i in range(len(divs) - 1)
]
else:
event.ignore()
def dragMoveEvent(self, event):
"""Set the appropriate layers list divider to be highlighted when
dragging a layer to a new position in the layers list.
"""
max_height = self.frameGeometry().height()
if (
event.pos().y() < self._min_scroll_region
and not self.dragTimer.isActive()
):
self._scroll_up = True
self.dragTimer.start()
elif (
event.pos().y() > max_height - self._min_scroll_region
and not self.dragTimer.isActive()
):
self._scroll_up = False
self.dragTimer.start()
elif (
self.dragTimer.isActive()
and event.pos().y() >= self._min_scroll_region
and event.pos().y() <= max_height - self._min_scroll_region
):
self.dragTimer.stop()
# Determine which widget center is the mouse currently closed to
cord = event.pos().y() + self.verticalScrollBar().value()
center_list = (i for i, x in enumerate(self.centers) if x > cord)
divider_index = next(center_list, len(self.centers))
# Determine the current location of the widget being dragged
total = self.vbox_layout.count() // 2 - 1
insert = total - divider_index
index = self.layers.index(self.drag_name)
# If the widget being dragged hasn't moved above or below any other
# widgets then don't highlight any dividers
selected = not (insert == index) and not (insert - 1 == index)
# Set the selected state of all the dividers
for i in range(0, self.vbox_layout.count(), 2):
if i == 2 * divider_index:
self.vbox_layout.itemAt(i).widget().setSelected(selected)
else:
self.vbox_layout.itemAt(i).widget().setSelected(False)
def dropEvent(self, event):
if self.dragTimer.isActive():
self.dragTimer.stop()
for i in range(0, self.vbox_layout.count(), 2):
self.vbox_layout.itemAt(i).widget().setSelected(False)
cord = event.pos().y() + self.verticalScrollBar().value()
center_list = (i for i, x in enumerate(self.centers) if x > cord)
divider_index = next(center_list, len(self.centers))
total = self.vbox_layout.count() // 2 - 1
insert = total - divider_index
index = self.layers.index(self.drag_name)
if index != insert and index + 1 != insert:
if insert >= index:
insert -= 1
self.layers.move_selected(index, insert)
event.accept()
class QtLayers(QScrollArea):
def __init__(self, layers):
super().__init__()
self.layers = layers
self.setWidgetResizable(True)
self.setHorizontalScrollBarPolicy(Qt.ScrollBarAlwaysOff)
scrollWidget = QWidget()
self.setWidget(scrollWidget)
self.vbox_layout = QVBoxLayout(scrollWidget)
self.vbox_layout.addWidget(QtDivider())
self.vbox_layout.addStretch(1)
self.vbox_layout.setContentsMargins(0, 0, 0, 0)
self.centers = []
self.setAcceptDrops(True)
self.setToolTip('Layer list')
self.layers.events.added.connect(self._add)
self.layers.events.removed.connect(self._remove)
self.layers.events.reordered.connect(self._reorder)
def _add(self, event):
"""Insert `event.widget` at index `event.index`."""
layer = event.item
index = event.index
total = len(self.layers)
if layer._qt_properties is not None:
self.vbox_layout.insertWidget(2 * (total - index) - 1,
layer._qt_properties)
self.vbox_layout.insertWidget(2 * (total - index), QtDivider())
def _remove(self, event):
"""Remove layer widget at index `event.index`."""
layer = event.item
if layer._qt_properties is not None:
index = self.vbox_layout.indexOf(layer._qt_properties)
divider = self.vbox_layout.itemAt(index + 1).widget()
self.vbox_layout.removeWidget(layer._qt_properties)
layer._qt_properties.deleteLater()
layer._qt_properties = None
self.vbox_layout.removeWidget(divider)
divider.deleteLater()
divider = None
def _reorder(self, event):
"""Reorders list of layer widgets by looping through all
widgets in list sequentially removing them and inserting
them into the correct place in final list.
"""
total = len(self.layers)
for i in range(total):
layer = self.layers[i]
if layer._qt_properties is not None:
index = self.vbox_layout.indexOf(layer._qt_properties)
divider = self.vbox_layout.itemAt(index + 1).widget()
self.vbox_layout.removeWidget(layer._qt_properties)
self.vbox_layout.removeWidget(divider)
self.vbox_layout.insertWidget(2 * (total - i) - 1,
layer._qt_properties)
self.vbox_layout.insertWidget(2 * (total - i), divider)
def mouseReleaseEvent(self, event):
"""Unselects all layer widgets."""
self.layers.unselect_all()
def dragLeaveEvent(self, event):
"""Unselects layer dividers."""
event.ignore()
for i in range(0, self.vbox_layout.count(), 2):
self.vbox_layout.itemAt(i).widget().setSelected(False)
def dragEnterEvent(self, event):
event.accept()
divs = []
for i in range(0, self.vbox_layout.count(), 2):
widget = self.vbox_layout.itemAt(i).widget()
divs.append(widget.y() + widget.frameGeometry().height() / 2)
self.centers = [(divs[i + 1] + divs[i]) / 2
for i in range(len(divs) - 1)]
def dragMoveEvent(self, event):
"""Set the appropriate layers list divider to be highlighted when
dragging a layer to a new position in the layers list.
"""
# Determine which widget center is the mouse currently closed to
cord = event.pos().y()
center_list = (i for i, x in enumerate(self.centers) if x > cord)
divider_index = next(center_list, len(self.centers))
# Determine the current location of the widget being dragged
layerWidget = event.source()
total = self.vbox_layout.count() // 2 - 1
index = total - self.vbox_layout.indexOf(layerWidget) // 2 - 1
insert = total - divider_index
# If the widget being dragged hasn't moved above or below any other
# widgets then don't highlight any dividers
selected = (not (insert == index) and not (insert - 1 == index))
# Set the selected state of all the dividers
for i in range(0, self.vbox_layout.count(), 2):
if i == 2 * divider_index:
self.vbox_layout.itemAt(i).widget().setSelected(selected)
else:
self.vbox_layout.itemAt(i).widget().setSelected(False)
def dropEvent(self, event):
for i in range(0, self.vbox_layout.count(), 2):
self.vbox_layout.itemAt(i).widget().setSelected(False)
cord = event.pos().y()
center_list = (i for i, x in enumerate(self.centers) if x > cord)
divider_index = next(center_list, len(self.centers))
layerWidget = event.source()
total = self.vbox_layout.count() // 2 - 1
index = total - self.vbox_layout.indexOf(layerWidget) // 2 - 1
insert = total - divider_index
if index != insert and index + 1 != insert:
if not self.layers[index].selected:
self.layers.unselect_all()
self.layers[index].selected = True
self.layers._move_layers(index, insert)
event.accept()
class QtLayerList(QScrollArea):
"""Widget storing a list of all the layers present in the current window.
Parameters
----------
layers : napari.components.LayerList
The layer list to track and display.
Attributes
----------
centers : list
List of layer widgets center coordinates.
layers : napari.components.LayerList
The layer list to track and display.
vbox_layout : QVBoxLayout
The layout instance in which the layouts appear.
"""
def __init__(self, layers: 'LayerList'):
super().__init__()
self.layers = layers
self.setAttribute(Qt.WA_DeleteOnClose)
self.setWidgetResizable(True)
self.setHorizontalScrollBarPolicy(Qt.ScrollBarAlwaysOff)
scrollWidget = QWidget()
self.setWidget(scrollWidget)
self.vbox_layout = QVBoxLayout(scrollWidget)
self.vbox_layout.addWidget(QtDivider())
self.vbox_layout.addStretch(1)
self.vbox_layout.setContentsMargins(0, 0, 0, 0)
self.vbox_layout.setSpacing(2)
self.centers = []
# Create a timer to be used for autoscrolling the layers list up and
# down when dragging a layer near the end of the displayed area
self._drag_timer = QTimer()
self._drag_timer.setSingleShot(False)
self._drag_timer.setInterval(20)
self._drag_timer.timeout.connect(self._force_scroll)
self._scroll_up = True
self._min_scroll_region = 24
self.setAcceptDrops(True)
self.setToolTip(trans._('Layer list'))
self.setSizePolicy(QSizePolicy.Fixed, QSizePolicy.Expanding)
self.layers.events.inserted.connect(self._add)
self.layers.events.removed.connect(self._remove)
self.layers.events.reordered.connect(self._reorder)
self.layers.selection.events.changed.connect(self._on_selection_change)
self._drag_start_position = np.zeros(2)
self._drag_name = None
self.chunk_receiver = _create_chunk_receiver(self)
def _on_selection_change(self, event):
for layer in event.added:
w = self._find_widget(layer)
if w:
w.setSelected(True)
for layer in event.removed:
w = self._find_widget(layer)
if w:
w.setSelected(False)
if event.added:
self._ensure_visible(list(event.added)[-1])
def _find_widget(self, layer):
for i in range(self.vbox_layout.count()):
w = self.vbox_layout.itemAt(i).widget()
if getattr(w, 'layer', None) == layer:
return w
def _add(self, event):
"""Insert widget for layer `event.value` at index `event.index`.
Parameters
----------
event : napari.utils.event.Event
The napari event that triggered this method.
"""
layer = event.value
total = len(self.layers)
index = 2 * (total - event.index) - 1
widget = QtLayerWidget(layer, selected=layer in self.layers.selection)
self.vbox_layout.insertWidget(index, widget)
self.vbox_layout.insertWidget(index + 1, QtDivider())
def _remove(self, event):
"""Remove widget for layer at index `event.index`.
Parameters
----------
event : napari.utils.event.Event
The napari event that triggered this method.
"""
layer_index = event.index
total = len(self.layers)
# Find property widget and divider for layer to be removed
index = 2 * (total - layer_index) + 1
widget = self.vbox_layout.itemAt(index).widget()
divider = self.vbox_layout.itemAt(index + 1).widget()
self.vbox_layout.removeWidget(widget)
disconnect_events(widget.layer.events, self)
widget.close()
self.vbox_layout.removeWidget(divider)
divider.deleteLater()
def _reorder(self, event=None):
"""Reorder list of layer widgets.
Loops through all widgets in list, sequentially removing them
and inserting them into the correct place in the final list.
Parameters
----------
event : napari.utils.event.Event, optional
The napari event that triggered this method.
"""
total = len(self.layers)
# Create list of the current property and divider widgets
widgets = [
self.vbox_layout.itemAt(i + 1).widget() for i in range(2 * total)
]
# Take every other widget to ignore the dividers and get just the
# property widgets
indices = [
self.layers.index(w.layer)
for i, w in enumerate(widgets)
if i % 2 == 0
]
# Move through the layers in order
for i in range(total):
# Find index of property widget in list of the current layer
index = 2 * indices.index(i)
widget = widgets[index]
divider = widgets[index + 1]
# Check if current index does not match new index
index_current = self.vbox_layout.indexOf(widget)
index_new = 2 * (total - i) - 1
if index_current != index_new:
# Remove that property widget and divider
self.vbox_layout.removeWidget(widget)
self.vbox_layout.removeWidget(divider)
# Insert the property widget and divider into new location
self.vbox_layout.insertWidget(index_new, widget)
self.vbox_layout.insertWidget(index_new + 1, divider)
def _force_scroll(self):
"""Force the scroll bar to automattically scroll either up or down."""
cur_value = self.verticalScrollBar().value()
if self._scroll_up:
new_value = cur_value - self.verticalScrollBar().singleStep() / 4
if new_value < 0:
new_value = 0
self.verticalScrollBar().setValue(new_value)
else:
new_value = cur_value + self.verticalScrollBar().singleStep() / 4
if new_value > self.verticalScrollBar().maximum():
new_value = self.verticalScrollBar().maximum()
self.verticalScrollBar().setValue(new_value)
def _ensure_visible(self, layer):
"""Ensure layer widget for at particular layer is visible.
Parameters
----------
layer : napari.layers.Layer
An instance of a napari layer.
"""
total = len(self.layers)
layer_index = self.layers.index(layer)
# Find property widget and divider for layer to be removed
index = 2 * (total - layer_index) - 1
widget = self.vbox_layout.itemAt(index).widget()
self.ensureWidgetVisible(widget)
def keyPressEvent(self, event):
"""Ignore a key press event.
Allows the event to pass through a parent widget to its child widget
without doing anything. If we did not use event.ignore() then the
parent widget would catch the event and not pass it on to the child.
Parameters
----------
event : qtpy.QtCore.QEvent
Event from the Qt context.
"""
event.ignore()
def keyReleaseEvent(self, event):
"""Ignore key release event.
Allows the event to pass through a parent widget to its child widget
without doing anything. If we did not use event.ignore() then the
parent widget would catch the event and not pass it on to the child.
Parameters
----------
event : qtpy.QtCore.QEvent
Event from the Qt context.
"""
event.ignore()
def mousePressEvent(self, event):
"""Register mouse click if it happens on a layer widget.
Checks if mouse press happens on a layer properties widget or
a child of such a widget. If not, the press has happened on the
Layers Widget itself and should be ignored.
Parameters
----------
event : qtpy.QtCore.QEvent
Event from the Qt context.
"""
widget = self.childAt(event.pos())
layer = (
getattr(widget, 'layer', None)
or getattr(widget.parentWidget(), 'layer', None)
or getattr(widget.parentWidget().parentWidget(), 'layer', None)
)
if layer is not None:
self._drag_start_position = np.array(
[event.pos().x(), event.pos().y()]
)
self._drag_name = layer.name
else:
self._drag_name = None
def mouseReleaseEvent(self, event):
"""Select layer using mouse click.
Key modifiers:
Shift - If the Shift button is pressed, select all layers in between
currently selected one and the clicked one.
Control - If the Control button is pressed, mouse click will
toggle selected state of the layer.
Parameters
----------
event : qtpy.QtCore.QEvent
Event from the Qt context.
"""
if self._drag_name is None:
# Unselect all the layers if not dragging a layer
self.layers.selection.active = None
return
modifiers = event.modifiers()
clicked_layer = self.layers[self._drag_name]
if modifiers == Qt.ShiftModifier and self.layers.selection._current:
# shift-click: select all layers between current and clicked
clicked = self.layers.index(clicked_layer)
current = self.layers.index(self.layers.selection._current)
from_, to_ = sorted([clicked, current])
_to_select = self.layers[slice(from_, to_ + 1)] # inclusive range
self.layers.selection.update(_to_select)
self.layers.selection._current = clicked_layer
elif modifiers == Qt.ControlModifier:
# If control click toggle selected state of clicked layer
self.layers.selection.toggle(clicked_layer)
else:
# If otherwise unselect all and leave clicked one selected
self.layers.selection.active = clicked_layer
def mouseMoveEvent(self, event):
"""Drag and drop layer with mouse movement.
Parameters
----------
event : qtpy.QtCore.QEvent
Event from the Qt context.
"""
position = np.array([event.pos().x(), event.pos().y()])
distance = np.linalg.norm(position - self._drag_start_position)
if (
distance < QApplication.startDragDistance()
or self._drag_name is None
):
return
mimeData = QMimeData()
mimeData.setText(self._drag_name)
drag = QDrag(self)
drag.setMimeData(mimeData)
drag.setHotSpot(event.pos() - self.rect().topLeft())
drag.exec_()
# Check if dragged layer still exists or was deleted during drag
names = [layer.name for layer in self.layers]
dragged_layer_exists = self._drag_name in names
if self._drag_name is not None and dragged_layer_exists:
index = self.layers.index(self._drag_name)
layer = self.layers[index]
self._ensure_visible(layer)
def dragLeaveEvent(self, event):
"""Unselects layer dividers.
Allows the event to pass through a parent widget to its child widget
without doing anything. If we did not use event.ignore() then the
parent widget would catch the event and not pass it on to the child.
Parameters
----------
event : qtpy.QtCore.QEvent
Event from the Qt context.
"""
event.ignore()
self._drag_timer.stop()
for i in range(0, self.vbox_layout.count(), 2):
self.vbox_layout.itemAt(i).widget().setSelected(False)
def dragEnterEvent(self, event):
"""Update divider position before dragging layer widget to new position
Allows the event to pass through a parent widget to its child widget
without doing anything. If we did not use event.ignore() then the
parent widget would catch the event and not pass it on to the child.
Parameters
----------
event : qtpy.QtCore.QEvent
Event from the Qt context.
"""
if event.source() == self:
event.accept()
divs = []
for i in range(0, self.vbox_layout.count(), 2):
widget = self.vbox_layout.itemAt(i).widget()
divs.append(widget.y() + widget.frameGeometry().height() / 2)
self.centers = [
(divs[i + 1] + divs[i]) / 2 for i in range(len(divs) - 1)
]
else:
event.ignore()
def dragMoveEvent(self, event):
"""Highlight appriate divider when dragging layer to new position.
Sets the appropriate layers list divider to be highlighted when
dragging a layer to a new position in the layers list.
Parameters
----------
event : qtpy.QtCore.QEvent
Event from the Qt context.
"""
max_height = self.frameGeometry().height()
if (
event.pos().y() < self._min_scroll_region
and not self._drag_timer.isActive()
):
self._scroll_up = True
self._drag_timer.start()
elif (
event.pos().y() > max_height - self._min_scroll_region
and not self._drag_timer.isActive()
):
self._scroll_up = False
self._drag_timer.start()
elif (
self._drag_timer.isActive()
and event.pos().y() >= self._min_scroll_region
and event.pos().y() <= max_height - self._min_scroll_region
):
self._drag_timer.stop()
# Determine which widget center is the mouse currently closed to
cord = event.pos().y() + self.verticalScrollBar().value()
center_list = (i for i, x in enumerate(self.centers) if x > cord)
divider_index = next(center_list, len(self.centers))
# Determine the current location of the widget being dragged
total = self.vbox_layout.count() // 2 - 1
insert = total - divider_index
index = self.layers.index(self._drag_name)
# If the widget being dragged hasn't moved above or below any other
# widgets then don't highlight any dividers
selected = not (insert == index) and not (insert - 1 == index)
# Set the selected state of all the dividers
for i in range(0, self.vbox_layout.count(), 2):
if i == 2 * divider_index:
self.vbox_layout.itemAt(i).widget().setSelected(selected)
else:
self.vbox_layout.itemAt(i).widget().setSelected(False)
def dropEvent(self, event):
"""Drop dragged layer widget into new position in the list of layers.
Parameters
----------
event : qtpy.QtCore.QEvent
Event from the Qt context.
"""
if self._drag_timer.isActive():
self._drag_timer.stop()
for i in range(0, self.vbox_layout.count(), 2):
self.vbox_layout.itemAt(i).widget().setSelected(False)
cord = event.pos().y() + self.verticalScrollBar().value()
center_list = (i for i, x in enumerate(self.centers) if x > cord)
divider_index = next(center_list, len(self.centers))
total = self.vbox_layout.count() // 2 - 1
insert = total - divider_index
index = self.layers.index(self._drag_name)
if index != insert and index + 1 != insert:
if insert >= index:
insert -= 1
self.layers.move_selected(index, insert)
event.accept()
class QtLayersList(QScrollArea):
def __init__(self, layers):
super().__init__()
self.layers = layers
self.setWidgetResizable(True)
self.setHorizontalScrollBarPolicy(Qt.ScrollBarAlwaysOff)
scrollWidget = QWidget()
self.setWidget(scrollWidget)
self.vbox_layout = QVBoxLayout(scrollWidget)
self.vbox_layout.addWidget(QtDivider())
self.vbox_layout.addStretch(1)
self.vbox_layout.setContentsMargins(0, 0, 0, 0)
self.centers = []
self.setAcceptDrops(True)
self.setToolTip('Layer list')
self.layers.events.added.connect(self._add)
self.layers.events.removed.connect(self._remove)
self.layers.events.reordered.connect(self._reorder)
def _add(self, event):
"""Inserts a layer widget at a specific index
"""
layer = event.item
index = event.index
total = len(self.layers)
if layer._qt_properties is not None:
self.vbox_layout.insertWidget(2 * (total - index) - 1,
layer._qt_properties)
self.vbox_layout.insertWidget(2 * (total - index), QtDivider())
def _remove(self, event):
"""Removes a layer widget
"""
layer = event.item
if layer._qt_properties is not None:
index = self.vbox_layout.indexOf(layer._qt_properties)
divider = self.vbox_layout.itemAt(index + 1).widget()
self.vbox_layout.removeWidget(layer._qt_properties)
layer._qt_properties.deleteLater()
layer._qt_properties = None
self.vbox_layout.removeWidget(divider)
divider.deleteLater()
divider = None
def _reorder(self, event):
"""Reorders list of layer widgets by looping through all
widgets in list sequentially removing them and inserting
them into the correct place in final list.
"""
total = len(self.layers)
for i in range(total):
layer = self.layers[i]
if layer._qt_properties is not None:
index = self.vbox_layout.indexOf(layer._qt_properties)
divider = self.vbox_layout.itemAt(index + 1).widget()
self.vbox_layout.removeWidget(layer._qt_properties)
self.vbox_layout.removeWidget(divider)
self.vbox_layout.insertWidget(2 * (total - i) - 1,
layer._qt_properties)
self.vbox_layout.insertWidget(2 * (total - i), divider)
def mouseReleaseEvent(self, event):
"""Unselects all layer widgets
"""
self.layers.unselect_all()
def dragLeaveEvent(self, event):
"""Unselects layer dividers
"""
event.ignore()
for i in range(0, self.vbox_layout.count(), 2):
self.vbox_layout.itemAt(i).widget().setSelected(False)
def dragEnterEvent(self, event):
event.accept()
divs = []
for i in range(0, self.vbox_layout.count(), 2):
widget = self.vbox_layout.itemAt(i).widget()
divs.append(widget.y() + widget.frameGeometry().height() / 2)
self.centers = [(divs[i + 1] + divs[i]) / 2
for i in range(len(divs) - 1)]
def dragMoveEvent(self, event):
cord = event.pos().y()
center_list = (i for i, x in enumerate(self.centers) if x > cord)
divider_index = next(center_list, len(self.centers))
layerWidget = event.source()
total = self.vbox_layout.count() // 2 - 1
index = total - self.vbox_layout.indexOf(layerWidget) // 2 - 1
insert = total - divider_index
if not (insert == index) and not (insert - 1 == index):
state = True
else:
state = False
for i in range(0, self.vbox_layout.count(), 2):
if i == 2 * divider_index:
self.vbox_layout.itemAt(i).widget().setSelected(state)
else:
self.vbox_layout.itemAt(i).widget().setSelected(False)
def dropEvent(self, event):
for i in range(0, self.vbox_layout.count(), 2):
self.vbox_layout.itemAt(i).widget().setSelected(False)
cord = event.pos().y()
center_list = (i for i, x in enumerate(self.centers) if x > cord)
divider_index = next(center_list, len(self.centers))
layerWidget = event.source()
total = self.vbox_layout.count() // 2 - 1
index = total - self.vbox_layout.indexOf(layerWidget) // 2 - 1
insert = total - divider_index
if index != insert and index + 1 != insert:
if not self.layers[index].selected:
self.layers.unselect_all()
self.layers[index].selected = True
self.layers._move_layers(index, insert)
event.accept()