class _LinkIcon(QGraphicsEllipseItem):
"""An icon to show over a Link."""
def __init__(self, x, y, w, h, parent):
super().__init__(x, y, w, h, parent)
self._parent = parent
color = QColor("slateblue")
self.setBrush(qApp.palette().window()) # pylint: disable=undefined-variable
self._text_item = QGraphicsTextItem(self)
font = QFont('Font Awesome 5 Free Solid')
self._text_item.setFont(font)
self._text_item.setDefaultTextColor(color)
self._svg_item = QGraphicsSvgItem(self)
self._datapkg_renderer = QSvgRenderer()
self._datapkg_renderer.load(":/icons/datapkg.svg")
self.setFlag(QGraphicsItem.ItemIsSelectable, enabled=False)
self._block_updates = False
def update_icon(self):
"""Sets the icon (filter, datapkg, or none), depending on Connection state."""
connection = self._parent.connection
if connection.use_datapackage:
self.setVisible(True)
self._svg_item.setVisible(True)
self._svg_item.setSharedRenderer(self._datapkg_renderer)
scale = 0.8 * self.rect().width(
) / self._datapkg_renderer.defaultSize().width()
self._svg_item.setScale(scale)
self._svg_item.setPos(0, 0)
self._svg_item.setPos(self.sceneBoundingRect().center() -
self._svg_item.sceneBoundingRect().center())
self._text_item.setVisible(False)
return
if connection.has_filters():
self.setVisible(True)
self._text_item.setVisible(True)
self._text_item.setPlainText("\uf0b0")
self._svg_item.setPos(0, 0)
self._text_item.setPos(
self.sceneBoundingRect().center() -
self._text_item.sceneBoundingRect().center())
self._svg_item.setVisible(False)
return
self.setVisible(False)
self._text_item.setVisible(False)
self._svg_item.setVisible(False)
class ProjectItemIcon(QGraphicsRectItem):
"""Base class for project item icons drawn in Design View."""
ITEM_EXTENT = 64
def __init__(self, toolbox, icon_file, icon_color, background_color):
"""
Args:
toolbox (ToolboxUI): QMainWindow instance
icon_file (str): Path to icon resource
icon_color (QColor): Icon's color
background_color (QColor): Background color
"""
super().__init__()
self._toolbox = toolbox
self.icon_file = icon_file
self._moved_on_scene = False
self.previous_pos = QPointF()
self.current_pos = QPointF()
self.icon_group = {self}
self.renderer = QSvgRenderer()
self.svg_item = QGraphicsSvgItem(self)
self.colorizer = QGraphicsColorizeEffect()
self.setRect(
QRectF(-self.ITEM_EXTENT / 2, -self.ITEM_EXTENT / 2,
self.ITEM_EXTENT, self.ITEM_EXTENT))
self.text_font_size = 10 # point size
# Make item name graphics item.
self._name = ""
self.name_item = QGraphicsSimpleTextItem(self._name, self)
self.set_name_attributes() # Set font, size, position, etc.
# Make connector buttons
self.connectors = dict(
bottom=ConnectorButton(self, toolbox, position="bottom"),
left=ConnectorButton(self, toolbox, position="left"),
right=ConnectorButton(self, toolbox, position="right"),
)
# Make exclamation and rank icons
self.exclamation_icon = ExclamationIcon(self)
self.execution_icon = ExecutionIcon(self)
self.rank_icon = RankIcon(self)
brush = QBrush(background_color)
self._setup(brush, icon_file, icon_color)
shadow_effect = QGraphicsDropShadowEffect()
shadow_effect.setOffset(1)
shadow_effect.setEnabled(False)
self.setGraphicsEffect(shadow_effect)
def finalize(self, name, x, y):
"""
Names the icon and moves it by given amount.
Args:
name (str): icon's name
x (int): horizontal offset
y (int): vertical offset
"""
self.update_name_item(name)
self.moveBy(x, y)
def _setup(self, brush, svg, svg_color):
"""Setup item's attributes.
Args:
brush (QBrush): Used in filling the background rectangle
svg (str): Path to SVG icon file
svg_color (QColor): Color of SVG icon
"""
self.setPen(QPen(Qt.black, 1, Qt.SolidLine))
self.setBrush(brush)
self.colorizer.setColor(svg_color)
# Load SVG
loading_ok = self.renderer.load(svg)
if not loading_ok:
self._toolbox.msg_error.emit(
"Loading SVG icon from resource:{0} failed".format(svg))
return
size = self.renderer.defaultSize()
self.svg_item.setSharedRenderer(self.renderer)
self.svg_item.setElementId(
"") # guess empty string loads the whole file
dim_max = max(size.width(), size.height())
rect_w = self.rect().width() # Parent rect width
margin = 32
self.svg_item.setScale((rect_w - margin) / dim_max)
self.svg_item.setPos(self.rect().center() -
self.svg_item.sceneBoundingRect().center())
self.svg_item.setGraphicsEffect(self.colorizer)
self.setFlag(QGraphicsItem.ItemIsMovable, enabled=True)
self.setFlag(QGraphicsItem.ItemIsSelectable, enabled=True)
self.setFlag(QGraphicsItem.ItemIsFocusable, enabled=True)
self.setFlag(QGraphicsItem.ItemSendsScenePositionChanges, enabled=True)
self.setAcceptHoverEvents(True)
self.setCursor(Qt.PointingHandCursor)
# Set exclamation, execution_log, and rank icons position
self.exclamation_icon.setPos(
self.rect().topRight() -
self.exclamation_icon.sceneBoundingRect().topRight())
self.execution_icon.setPos(
self.rect().bottomRight() -
0.5 * self.execution_icon.sceneBoundingRect().bottomRight())
self.rank_icon.setPos(self.rect().topLeft())
def name(self):
"""Returns name of the item that is represented by this icon.
Returns:
str: icon's name
"""
return self._name
def update_name_item(self, new_name):
"""Set a new text to name item.
Args:
new_name (str): icon's name
"""
self._name = new_name
self.name_item.setText(new_name)
self.set_name_attributes()
def set_name_attributes(self):
"""Set name QGraphicsSimpleTextItem attributes (font, size, position, etc.)"""
# Set font size and style
font = self.name_item.font()
font.setPointSize(self.text_font_size)
font.setBold(True)
self.name_item.setFont(font)
# Set name item position (centered on top of the master icon)
name_width = self.name_item.boundingRect().width()
name_height = self.name_item.boundingRect().height()
self.name_item.setPos(
self.rect().x() + self.rect().width() / 2 - name_width / 2,
self.rect().y() - name_height - 4)
def conn_button(self, position="left"):
"""Returns item's connector button.
Args:
position (str): "left", "right" or "bottom"
Returns:
QWidget: connector button
"""
return self.connectors.get(position, self.connectors["left"])
def outgoing_links(self):
"""Collects outgoing links.
Returns:
list of LinkBase: outgoing links
"""
return [
l for conn in self.connectors.values()
for l in conn.outgoing_links()
]
def incoming_links(self):
"""Collects incoming links.
Returns:
list of LinkBase: outgoing links
"""
return [
l for conn in self.connectors.values()
for l in conn.incoming_links()
]
def run_execution_leave_animation(self, skipped):
"""
Starts the animation associated with execution leaving the icon.
Args:
skipped (bool): True if project item was not actually executed.
"""
animation_group = QParallelAnimationGroup(self._toolbox)
for link in self.outgoing_links():
animation_group.addAnimation(
link.make_execution_animation(skipped))
animation_group.start()
def hoverEnterEvent(self, event):
"""Sets a drop shadow effect to icon when mouse enters its boundaries.
Args:
event (QGraphicsSceneMouseEvent): Event
"""
self.prepareGeometryChange()
self.graphicsEffect().setEnabled(True)
event.accept()
def hoverLeaveEvent(self, event):
"""Disables the drop shadow when mouse leaves icon boundaries.
Args:
event (QGraphicsSceneMouseEvent): Event
"""
self.prepareGeometryChange()
self.graphicsEffect().setEnabled(False)
event.accept()
def mousePressEvent(self, event):
super().mousePressEvent(event)
self.icon_group = set(x for x in self.scene().selectedItems()
if isinstance(x, ProjectItemIcon)) | {self}
for icon in self.icon_group:
icon.previous_pos = icon.scenePos()
def mouseMoveEvent(self, event):
"""Moves icon(s) while the mouse button is pressed.
Update links that are connected to selected icons.
Args:
event (QGraphicsSceneMouseEvent): Event
"""
super().mouseMoveEvent(event)
self.update_links_geometry()
def moveBy(self, dx, dy):
super().moveBy(dx, dy)
self.update_links_geometry()
def update_links_geometry(self):
"""Updates geometry of connected links to reflect this item's most recent position."""
links = set(link for icon in self.icon_group
for conn in icon.connectors.values()
for link in conn.links)
for link in links:
link.update_geometry()
def mouseReleaseEvent(self, event):
for icon in self.icon_group:
icon.current_pos = icon.scenePos()
# pylint: disable=undefined-variable
if (self.current_pos - self.previous_pos
).manhattanLength() > qApp.startDragDistance():
self._toolbox.undo_stack.push(
MoveIconCommand(self, self._toolbox.project()))
super().mouseReleaseEvent(event)
def notify_item_move(self):
if self._moved_on_scene:
self._moved_on_scene = False
scene = self.scene()
scene.item_move_finished.emit(self)
def contextMenuEvent(self, event):
"""Show item context menu.
Args:
event (QGraphicsSceneMouseEvent): Mouse event
"""
event.accept()
self.scene().clearSelection()
self.setSelected(True)
ind = self._toolbox.project_item_model.find_item(self.name())
self._toolbox.show_project_item_context_menu(event.screenPos(), ind)
def itemChange(self, change, value):
"""
Reacts to item removal and position changes.
In particular, destroys the drop shadow effect when the items is removed from a scene
and keeps track of item's movements on the scene.
Args:
change (GraphicsItemChange): a flag signalling the type of the change
value: a value related to the change
Returns:
Whatever super() does with the value parameter
"""
if change == QGraphicsItem.ItemScenePositionHasChanged:
self._moved_on_scene = True
elif change == QGraphicsItem.GraphicsItemChange.ItemSceneChange and value is None:
self.prepareGeometryChange()
self.setGraphicsEffect(None)
return super().itemChange(change, value)
def select_item(self):
"""Update GUI to show the details of the selected item."""
ind = self._toolbox.project_item_model.find_item(self.name())
self._toolbox.ui.treeView_project.setCurrentIndex(ind)
class EntityItem(QGraphicsRectItem):
"""Base class for ObjectItem and RelationshipItem."""
def __init__(self, spine_db_editor, x, y, extent, db_map_entity_id=None):
"""Initializes item
Args:
spine_db_editor (SpineDBEditor): 'owner'
x (float): x-coordinate of central point
y (float): y-coordinate of central point
extent (int): Preferred extent
db_map_entity_id (tuple): db_map, entity id
"""
super().__init__()
self._spine_db_editor = spine_db_editor
self.db_mngr = spine_db_editor.db_mngr
self.db_map_entity_id = db_map_entity_id
self.arc_items = list()
self._extent = extent
self.setRect(-0.5 * self._extent, -0.5 * self._extent, self._extent,
self._extent)
self.setPen(Qt.NoPen)
self._svg_item = QGraphicsSvgItem(self)
self._svg_item.setCacheMode(
QGraphicsItem.CacheMode.NoCache
) # Needed for the exported pdf to be vector
self.refresh_icon()
self.setPos(x, y)
self._moved_on_scene = False
self._bg = None
self._bg_brush = Qt.NoBrush
self._init_bg()
self._bg.setFlag(QGraphicsItem.ItemStacksBehindParent, enabled=True)
self.setZValue(0)
self.setFlag(QGraphicsItem.ItemIsSelectable, enabled=True)
self.setFlag(QGraphicsItem.ItemIsMovable, enabled=True)
self.setFlag(QGraphicsItem.ItemIgnoresTransformations, enabled=True)
self.setFlag(QGraphicsItem.ItemSendsScenePositionChanges, enabled=True)
self.setAcceptHoverEvents(True)
self.setCursor(Qt.ArrowCursor)
self.setToolTip(self._make_tool_tip())
def _make_tool_tip(self):
raise NotImplementedError()
@property
def entity_type(self):
raise NotImplementedError()
@property
def entity_name(self):
return self.db_mngr.get_item(self.db_map, self.entity_type,
self.entity_id)["name"]
@property
def entity_class_type(self):
return {
"relationship": "relationship_class",
"object": "object_class"
}[self.entity_type]
@property
def entity_class_id(self):
return self.db_mngr.get_item(self.db_map, self.entity_type,
self.entity_id)["class_id"]
@property
def entity_class_name(self):
return self.db_mngr.get_item(self.db_map, self.entity_class_type,
self.entity_class_id)["name"]
@property
def db_map(self):
return self.db_map_entity_id[0]
@property
def entity_id(self):
return self.db_map_entity_id[1]
@property
def first_db_map(self):
return self.db_map
@property
def display_data(self):
return self.entity_name
@property
def display_database(self):
return self.db_map.codename
@property
def db_maps(self):
return (self.db_map, )
def db_map_data(self, _db_map):
# NOTE: Needed by EditObjectsDialog and EditRelationshipsDialog
return self.db_mngr.get_item(self.db_map, self.entity_type,
self.entity_id)
def db_map_id(self, _db_map):
# NOTE: Needed by EditObjectsDialog and EditRelationshipsDialog
return self.entity_id
def boundingRect(self):
return super().boundingRect() | self.childrenBoundingRect()
def moveBy(self, dx, dy):
super().moveBy(dx, dy)
self.update_arcs_line()
def _init_bg(self):
self._bg = QGraphicsRectItem(self.boundingRect(), self)
self._bg.setPen(Qt.NoPen)
def refresh_icon(self):
"""Refreshes the icon."""
renderer = self.db_mngr.entity_class_renderer(self.db_map,
self.entity_class_type,
self.entity_class_id)
self._set_renderer(renderer)
def _set_renderer(self, renderer):
self._svg_item.setSharedRenderer(renderer)
size = renderer.defaultSize()
scale = self._extent / max(size.width(), size.height())
self._svg_item.setScale(scale)
self._svg_item.setPos(self.rect().center() - 0.5 * scale *
QPointF(size.width(), size.height()))
def shape(self):
"""Returns a shape containing the entire bounding rect, to work better with icon transparency."""
path = QPainterPath()
path.setFillRule(Qt.WindingFill)
path.addRect(self._bg.boundingRect())
return path
def paint(self, painter, option, widget=None):
"""Shows or hides the selection halo."""
if option.state & (QStyle.State_Selected):
self._paint_as_selected()
option.state &= ~QStyle.State_Selected
else:
self._paint_as_deselected()
super().paint(painter, option, widget)
def _paint_as_selected(self):
self._bg.setBrush(QGuiApplication.palette().highlight())
def _paint_as_deselected(self):
self._bg.setBrush(self._bg_brush)
def add_arc_item(self, arc_item):
"""Adds an item to the list of arcs.
Args:
arc_item (ArcItem)
"""
self.arc_items.append(arc_item)
arc_item.update_line()
def apply_zoom(self, factor):
"""Applies zoom.
Args:
factor (float): The zoom factor.
"""
if factor > 1:
factor = 1
self.setScale(factor)
def apply_rotation(self, angle, center):
"""Applies rotation.
Args:
angle (float): The angle in degrees.
center (QPoint): Rotates around this point.
"""
line = QLineF(center, self.pos())
line.setAngle(line.angle() + angle)
self.setPos(line.p2())
self.update_arcs_line()
def block_move_by(self, dx, dy):
self.moveBy(dx, dy)
def mouseMoveEvent(self, event):
"""Moves the item and all connected arcs.
Args:
event (QGraphicsSceneMouseEvent)
"""
if event.buttons() & Qt.LeftButton == 0:
super().mouseMoveEvent(event)
return
move_by = event.scenePos() - event.lastScenePos()
# Move selected items together
for item in self.scene().selectedItems():
if isinstance(item, (EntityItem)):
item.block_move_by(move_by.x(), move_by.y())
def update_arcs_line(self):
"""Moves arc items."""
for item in self.arc_items:
item.update_line()
def itemChange(self, change, value):
"""
Keeps track of item's movements on the scene.
Args:
change (GraphicsItemChange): a flag signalling the type of the change
value: a value related to the change
Returns:
the same value given as input
"""
if change == QGraphicsItem.ItemScenePositionHasChanged:
self._moved_on_scene = True
return value
def set_all_visible(self, on):
"""Sets visibility status for this item and all arc items.
Args:
on (bool)
"""
for item in self.arc_items:
item.setVisible(on)
self.setVisible(on)
def _make_menu(self):
return self._spine_db_editor.ui.graphicsView.make_items_menu()
def contextMenuEvent(self, e):
"""Shows context menu.
Args:
e (QGraphicsSceneMouseEvent): Mouse event
"""
e.accept()
if not self.isSelected() and not e.modifiers() & Qt.ControlModifier:
self.scene().clearSelection()
self.setSelected(True)
menu = self._make_menu()
menu.popup(e.screenPos())
class ProjectItemIcon(QGraphicsRectItem):
ITEM_EXTENT = 64
def __init__(self, toolbox, x, y, project_item, icon_file, icon_color,
background_color):
"""Base class for project item icons drawn in Design View.
Args:
toolbox (ToolBoxUI): QMainWindow instance
x (float): Icon x coordinate
y (float): Icon y coordinate
project_item (ProjectItem): Item
icon_file (str): Path to icon resource
icon_color (QColor): Icon's color
background_color (QColor): Background color
"""
super().__init__()
self._toolbox = toolbox
self._project_item = project_item
self._moved_on_scene = False
self._previous_pos = QPointF()
self._current_pos = QPointF()
self.icon_group = {self}
self.renderer = QSvgRenderer()
self.svg_item = QGraphicsSvgItem(self)
self.colorizer = QGraphicsColorizeEffect()
self.setRect(
QRectF(x - self.ITEM_EXTENT / 2, y - self.ITEM_EXTENT / 2,
self.ITEM_EXTENT, self.ITEM_EXTENT))
self.text_font_size = 10 # point size
# Make item name graphics item.
name = project_item.name if project_item else ""
self.name_item = QGraphicsSimpleTextItem(name, self)
self.set_name_attributes() # Set font, size, position, etc.
# Make connector buttons
self.connectors = dict(
bottom=ConnectorButton(self, toolbox, position="bottom"),
left=ConnectorButton(self, toolbox, position="left"),
right=ConnectorButton(self, toolbox, position="right"),
)
# Make exclamation and rank icons
self.exclamation_icon = ExclamationIcon(self)
self.rank_icon = RankIcon(self)
brush = QBrush(background_color)
self._setup(brush, icon_file, icon_color)
self.activate()
def activate(self):
"""Adds items to scene and setup graphics effect.
Called in the constructor and when re-adding the item to the project in the context of undo/redo.
"""
scene = self._toolbox.ui.graphicsView.scene()
scene.addItem(self)
shadow_effect = QGraphicsDropShadowEffect()
shadow_effect.setOffset(1)
shadow_effect.setEnabled(False)
self.setGraphicsEffect(shadow_effect)
def _setup(self, brush, svg, svg_color):
"""Setup item's attributes.
Args:
brush (QBrush): Used in filling the background rectangle
svg (str): Path to SVG icon file
svg_color (QColor): Color of SVG icon
"""
self.setPen(QPen(Qt.black, 1, Qt.SolidLine))
self.setBrush(brush)
self.colorizer.setColor(svg_color)
# Load SVG
loading_ok = self.renderer.load(svg)
if not loading_ok:
self._toolbox.msg_error.emit(
"Loading SVG icon from resource:{0} failed".format(svg))
return
size = self.renderer.defaultSize()
self.svg_item.setSharedRenderer(self.renderer)
self.svg_item.setElementId(
"") # guess empty string loads the whole file
dim_max = max(size.width(), size.height())
rect_w = self.rect().width() # Parent rect width
margin = 32
self.svg_item.setScale((rect_w - margin) / dim_max)
x_offset = (rect_w - self.svg_item.sceneBoundingRect().width()) / 2
y_offset = (rect_w - self.svg_item.sceneBoundingRect().height()) / 2
self.svg_item.setPos(self.rect().x() + x_offset,
self.rect().y() + y_offset)
self.svg_item.setGraphicsEffect(self.colorizer)
self.setFlag(QGraphicsItem.ItemIsMovable, enabled=True)
self.setFlag(QGraphicsItem.ItemIsSelectable, enabled=True)
self.setFlag(QGraphicsItem.ItemIsFocusable, enabled=True)
self.setFlag(QGraphicsItem.ItemSendsScenePositionChanges, enabled=True)
self.setAcceptHoverEvents(True)
self.setCursor(Qt.PointingHandCursor)
# Set exclamation and rank icons position
self.exclamation_icon.setPos(
self.rect().topRight() -
self.exclamation_icon.sceneBoundingRect().topRight())
self.rank_icon.setPos(self.rect().topLeft())
def name(self):
"""Returns name of the item that is represented by this icon."""
return self._project_item.name
def update_name_item(self, new_name):
"""Set a new text to name item. Used when a project item is renamed."""
self.name_item.setText(new_name)
self.set_name_attributes()
def set_name_attributes(self):
"""Set name QGraphicsSimpleTextItem attributes (font, size, position, etc.)"""
# Set font size and style
font = self.name_item.font()
font.setPointSize(self.text_font_size)
font.setBold(True)
self.name_item.setFont(font)
# Set name item position (centered on top of the master icon)
name_width = self.name_item.boundingRect().width()
name_height = self.name_item.boundingRect().height()
self.name_item.setPos(
self.rect().x() + self.rect().width() / 2 - name_width / 2,
self.rect().y() - name_height - 4)
def conn_button(self, position="left"):
"""Returns items connector button (QWidget)."""
return self.connectors.get(position, self.connectors["left"])
def outgoing_links(self):
return [
l for conn in self.connectors.values()
for l in conn.outgoing_links()
]
def incoming_links(self):
return [
l for conn in self.connectors.values()
for l in conn.incoming_links()
]
def hoverEnterEvent(self, event):
"""Sets a drop shadow effect to icon when mouse enters its boundaries.
Args:
event (QGraphicsSceneMouseEvent): Event
"""
self.prepareGeometryChange()
self.graphicsEffect().setEnabled(True)
event.accept()
def hoverLeaveEvent(self, event):
"""Disables the drop shadow when mouse leaves icon boundaries.
Args:
event (QGraphicsSceneMouseEvent): Event
"""
self.prepareGeometryChange()
self.graphicsEffect().setEnabled(False)
event.accept()
def mousePressEvent(self, event):
super().mousePressEvent(event)
self.icon_group = set(x for x in self.scene().selectedItems()
if isinstance(x, ProjectItemIcon)) | {self}
for icon in self.icon_group:
icon._previous_pos = icon.scenePos()
def mouseMoveEvent(self, event):
"""Moves icon(s) while the mouse button is pressed.
Update links that are connected to selected icons.
Args:
event (QGraphicsSceneMouseEvent): Event
"""
super().mouseMoveEvent(event)
self.update_links_geometry()
def moveBy(self, dx, dy):
super().moveBy(dx, dy)
self.update_links_geometry()
def update_links_geometry(self):
"""Updates geometry of connected links to reflect this item's most recent position."""
links = set(link for icon in self.icon_group
for conn in icon.connectors.values()
for link in conn.links)
for link in links:
link.update_geometry()
def mouseReleaseEvent(self, event):
for icon in self.icon_group:
icon._current_pos = icon.scenePos()
# pylint: disable=undefined-variable
if (self._current_pos - self._previous_pos
).manhattanLength() > qApp.startDragDistance():
self._toolbox.undo_stack.push(MoveIconCommand(self))
super().mouseReleaseEvent(event)
def notify_item_move(self):
if self._moved_on_scene:
self._moved_on_scene = False
scene = self.scene()
scene.item_move_finished.emit(self)
def contextMenuEvent(self, event):
"""Show item context menu.
Args:
event (QGraphicsSceneMouseEvent): Mouse event
"""
self.scene().clearSelection()
self.setSelected(True)
self._toolbox.show_item_image_context_menu(event.screenPos(),
self.name())
def keyPressEvent(self, event):
"""Handles deleting and rotating the selected
item when dedicated keys are pressed.
Args:
event (QKeyEvent): Key event
"""
if event.key() == Qt.Key_Delete and self.isSelected():
self._project_item._project.remove_item(self.name())
event.accept()
elif event.key() == Qt.Key_R and self.isSelected():
# TODO:
# 1. Change name item text direction when rotating
# 2. Save rotation into project file
rect = self.mapToScene(self.boundingRect()).boundingRect()
center = rect.center()
t = QTransform()
t.translate(center.x(), center.y())
t.rotate(90)
t.translate(-center.x(), -center.y())
self.setPos(t.map(self.pos()))
self.setRotation(self.rotation() + 90)
links = set(lnk for conn in self.connectors.values()
for lnk in conn.links)
for link in links:
link.update_geometry()
event.accept()
else:
super().keyPressEvent(event)
def itemChange(self, change, value):
"""
Reacts to item removal and position changes.
In particular, destroys the drop shadow effect when the items is removed from a scene
and keeps track of item's movements on the scene.
Args:
change (GraphicsItemChange): a flag signalling the type of the change
value: a value related to the change
Returns:
Whatever super() does with the value parameter
"""
if change == QGraphicsItem.ItemScenePositionHasChanged:
self._moved_on_scene = True
elif change == QGraphicsItem.GraphicsItemChange.ItemSceneChange and value is None:
self.prepareGeometryChange()
self.setGraphicsEffect(None)
return super().itemChange(change, value)
def show_item_info(self):
"""Update GUI to show the details of the selected item."""
ind = self._toolbox.project_item_model.find_item(self.name())
self._toolbox.ui.treeView_project.setCurrentIndex(ind)
class Message(SchemeItem):
"""A message that is displayed to the user.
Messages can be of different severity. This base class is inherited by InfoMessage, WarningMessage and
ErrorMessage.
"""
def __init__(self, text=None, icon_filename=None, parent=None):
super(Message, self).__init__(parent)
self.setFlag(QGraphicsItem.ItemHasNoContents)
# Message text -------------------------------------------------------------------------------------------------
self._text_item = TextLineItem(text or "Message", self)
# Message icon -------------------------------------------------------------------------------------------------
self._icon_item = QGraphicsSvgItem(self)
if icon_filename is not None:
self.setIcon(icon_filename)
self.styleChange()
self.paletteChange()
@classmethod
def severity(cls):
"""Message severity: how important is this message. Lower is more important."""
return 0
def setText(self, text):
self._text_item.setText(text)
def setIcon(self, icon_filename):
"""Set the icon from an SVG file."""
renderer = _svgRenderer(icon_filename)
self._icon_item.setSharedRenderer(renderer)
icon_size = self.style().pixelMetric(Style.MessageIconSize)
scale = icon_size / renderer.defaultSize().width()
self._icon_item.setScale(scale)
def text(self):
return self._text_item.text()
def styleChange(self):
super().styleChange()
style = self.style()
# Text item ----------------------------------------------------------------------------------------------------
self._text_item.setFont(style.font(Style.MessageTextFont))
self._text_item.setMaximumWidth(style.pixelMetric(Style.MessageTextLength))
# Position
text_metrics = QFontMetricsF(self._text_item.font())
icon_size = style.pixelMetric(Style.MessageIconSize)
margin = style.pixelMetric(Style.MessageIconTextMargin)
self._text_item.setPos(icon_size + margin, 0)
self._text_item.moveBy(0, text_metrics.capHeight() / 2)
self._text_item.moveBy(0, icon_size / 2)
# Icon item ----------------------------------------------------------------------------------------------------
icon_renderer = self._icon_item.renderer()
if icon_renderer is None: # No icon set
scale = 1
else:
scale = icon_size / icon_renderer.defaultSize().width()
self._icon_item.setScale(scale)
def paletteChange(self):
super().paletteChange()
text_bg = self.palette().background().color()
text_bg.setAlpha(196)
self._text_item.setBrush(self.palette().text())
self._text_item.setBackgroundBrush(text_bg)
def boundingRect(self) -> QRectF:
return QRectF()
def paint(self, painter: QPainter, option, widget=...) -> None:
pass
# Serialization ====================================================================================================
def serialize(self) -> dict:
return {
"text": self.text()
}
@classmethod
def deserialize(cls, data: dict):
obj = cls()
obj.setText(data["text"])
return obj