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from __future__ import annotations
from AnyQt.QtCore import Qt, QRect, QSize
from AnyQt.QtGui import QBrush, QIcon, QCursor, QPalette, QPainter, QMouseEvent
from AnyQt.QtWidgets import (
QHeaderView, QStyleOptionHeader, QStyle, QApplication, QStyleOptionViewItem
)
class HeaderView(QHeaderView):
"""
A QHeaderView reimplementing `paintSection` to better deal with
selections in large models.
In particular:
* `isColumnSelected`/`isRowSelected` are never queried, only
`rowIntersectsSelection`/`columnIntersectsSelection` are used.
* when `highlightSections` is not enabled the selection model is not
queried at all.
"""
def __init__(self, *args, **kwargs):
self.__pressed = -1 # Tracking the pressed section index
super().__init__(*args, **kwargs)
def set_pressed(index):
self.__pressed = index
self.sectionPressed.connect(set_pressed)
self.sectionEntered.connect(set_pressed)
# Workaround for QTBUG-89910
self.setFont(QApplication.font("QHeaderView"))
def mouseReleaseEvent(self, event: QMouseEvent):
self.__pressed = -1
super().mouseReleaseEvent(event)
def __sectionIntersectsSelection(self, logicalIndex: int) -> bool:
selmodel = self.selectionModel()
if selmodel is None:
return False # pragma: no cover
root = self.rootIndex()
if self.orientation() == Qt.Horizontal:
return selmodel.columnIntersectsSelection(logicalIndex, root)
else:
return selmodel.rowIntersectsSelection(logicalIndex, root)
def __isFirstVisibleSection(self, visualIndex):
log = self.logicalIndex(visualIndex)
if log != -1:
return (self.sectionPosition(log) == 0 and
self.sectionSize(log) > 0)
else:
return False # pragma: no cover
def __isLastVisibleSection(self, visualIndex):
log = self.logicalIndex(visualIndex)
if log != -1:
pos = self.sectionPosition(log)
size = self.sectionSize(log)
return size > 0 and pos + size == self.length()
else:
return False # pragma: no cover
# pylint: disable=too-many-branches
def initStyleOptionForIndex(
self, option: QStyleOptionHeader, logicalIndex: int
) -> None:
"""
Similar to initStyleOptionForIndex in Qt 6.0 with the difference that
`isSectionSelected` is not used, only `sectionIntersectsSelection`
is used (isSectionSelected will scan the entire model column/row
when the whole column/row is selected).
"""
model = self.model()
if model is None:
return
hover = self.logicalIndexAt(self.mapFromGlobal(QCursor.pos()))
pressed = self.__pressed
if self.highlightSections():
is_selected = self.__sectionIntersectsSelection
else:
is_selected = lambda _: False
state = QStyle.State_None
if self.isEnabled():
state |= QStyle.State_Enabled
if self.window().isActiveWindow():
state |= QStyle.State_Active
if self.sectionsClickable():
if logicalIndex == hover:
state |= QStyle.State_MouseOver
if logicalIndex == pressed:
state |= QStyle.State_Sunken
if self.highlightSections():
if is_selected(logicalIndex):
state |= QStyle.State_On
if self.isSortIndicatorShown() and \
self.sortIndicatorSection() == logicalIndex:
option.sortIndicator = (
QStyleOptionHeader.SortDown
if self.sortIndicatorOrder() == Qt.AscendingOrder
else QStyleOptionHeader.SortUp
)
style = self.style()
orientation = self.orientation()
textAlignment = model.headerData(logicalIndex, self.orientation(),
Qt.TextAlignmentRole)
defaultAlignment = self.defaultAlignment()
textAlignment = (textAlignment if isinstance(textAlignment, int)
else defaultAlignment)
option.section = logicalIndex
option.state = QStyle.State(option.state | state)
option.textAlignment = Qt.Alignment(textAlignment)
option.iconAlignment = Qt.AlignVCenter
text = model.headerData(logicalIndex, self.orientation(),
Qt.DisplayRole)
text = str(text) if text is not None else ""
option.text = text
icon = model.headerData(
logicalIndex, self.orientation(), Qt.DecorationRole)
try:
option.icon = QIcon(icon)
except (TypeError, ValueError): # pragma: no cover
pass
margin = 2 * style.pixelMetric(QStyle.PM_HeaderMargin, None, self)
headerArrowAlignment = style.styleHint(QStyle.SH_Header_ArrowAlignment,
None, self)
isHeaderArrowOnTheSide = headerArrowAlignment & Qt.AlignVCenter
if self.isSortIndicatorShown() and \
self.sortIndicatorSection() == logicalIndex \
and isHeaderArrowOnTheSide:
margin += style.pixelMetric(QStyle.PM_HeaderMarkSize, None, self)
if not option.icon.isNull():
margin += style.pixelMetric(QStyle.PM_SmallIconSize, None, self)
margin += style.pixelMetric(QStyle.PM_HeaderMargin, None, self)
if self.textElideMode() != Qt.ElideNone:
elideMode = self.textElideMode()
if hasattr(option, 'textElideMode'): # Qt 6.0
option.textElideMode = elideMode # pragma: no cover
else:
option.text = option.fontMetrics.elidedText(
option.text, elideMode, option.rect.width() - margin)
foregroundBrush = model.headerData(logicalIndex, orientation,
Qt.ForegroundRole)
try:
foregroundBrush = QBrush(foregroundBrush)
except (TypeError, ValueError):
pass
else:
option.palette.setBrush(QPalette.ButtonText, foregroundBrush)
backgroundBrush = model.headerData(logicalIndex, orientation,
Qt.BackgroundRole)
try:
backgroundBrush = QBrush(backgroundBrush)
except (TypeError, ValueError):
pass
else:
option.palette.setBrush(QPalette.Button, backgroundBrush)
option.palette.setBrush(QPalette.Window, backgroundBrush)
# the section position
visual = self.visualIndex(logicalIndex)
assert visual != -1
first = self.__isFirstVisibleSection(visual)
last = self.__isLastVisibleSection(visual)
if first and last:
option.position = QStyleOptionHeader.OnlyOneSection
elif first:
option.position = QStyleOptionHeader.Beginning
elif last:
option.position = QStyleOptionHeader.End
else:
option.position = QStyleOptionHeader.Middle
option.orientation = orientation
# the selected position (in QHeaderView this is always computed even if
# highlightSections is False).
if self.highlightSections():
previousSelected = is_selected(self.logicalIndex(visual - 1))
nextSelected = is_selected(self.logicalIndex(visual + 1))
else:
previousSelected = nextSelected = False
if previousSelected and nextSelected:
option.selectedPosition = QStyleOptionHeader.NextAndPreviousAreSelected
elif previousSelected:
option.selectedPosition = QStyleOptionHeader.PreviousIsSelected
elif nextSelected:
option.selectedPosition = QStyleOptionHeader.NextIsSelected
else:
option.selectedPosition = QStyleOptionHeader.NotAdjacent
def paintSection(self, painter, rect, logicalIndex):
# type: (QPainter, QRect, int) -> None
"""
Reimplemented from `QHeaderView`.
"""
# What follows is similar to QHeaderView::paintSection@Qt 6.0
if not rect.isValid():
return # pragma: no cover
oldBO = painter.brushOrigin()
opt = QStyleOptionHeader()
opt.rect = rect
self.initStyleOption(opt)
oBrushButton = opt.palette.brush(QPalette.Button)
oBrushWindow = opt.palette.brush(QPalette.Window)
self.initStyleOptionForIndex(opt, logicalIndex)
opt.rect = rect
nBrushButton = opt.palette.brush(QPalette.Button)
nBrushWindow = opt.palette.brush(QPalette.Window)
if oBrushButton != nBrushButton or oBrushWindow != nBrushWindow:
painter.setBrushOrigin(opt.rect.topLeft())
# draw the section
self.style().drawControl(QStyle.CE_Header, opt, painter, self)
painter.setBrushOrigin(oldBO)
class CheckableHeaderView(HeaderView):
"""
A HeaderView with checkable header items.
The header is checkable if the model defines a `Qt.CheckStateRole` value.
"""
__sectionPressed: int = -1
def paintSection(
self, painter: QPainter, rect: QRect, logicalIndex: int
) -> None:
opt = QStyleOptionHeader()
self.initStyleOption(opt)
self.initStyleOptionForIndex(opt, logicalIndex)
model = self.model()
if model is None:
return # pragma: no cover
opt.rect = rect
checkstate = self.sectionCheckState(logicalIndex)
ischeckable = checkstate is not None
style = self.style()
# draw background
style.drawControl(QStyle.CE_HeaderSection, opt, painter, self)
text_rect = QRect(rect)
optindicator = QStyleOptionViewItem()
optindicator.initFrom(self)
optindicator.font = self.font()
optindicator.fontMetrics = opt.fontMetrics
optindicator.features = QStyleOptionViewItem.HasCheckIndicator | QStyleOptionViewItem.HasDisplay
optindicator.rect = opt.rect
indicator_rect = style.subElementRect(
QStyle.SE_ItemViewItemCheckIndicator, optindicator, self)
text_rect.setLeft(indicator_rect.right() + 4)
if ischeckable:
optindicator.checkState = checkstate
optindicator.state |= QStyle.State_On if checkstate == Qt.Checked else QStyle.State_Off
optindicator.rect = indicator_rect
style.drawPrimitive(QStyle.PE_IndicatorItemViewItemCheck, optindicator,
painter, self)
opt.rect = text_rect
# draw section label
style.drawControl(QStyle.CE_HeaderLabel, opt, painter, self)
def mousePressEvent(self, event: QMouseEvent) -> None:
pos = event.pos()
section = self.logicalIndexAt(pos)
if section == -1 or not self.isSectionCheckable(section):
super().mousePressEvent(event)
return
if event.button() == Qt.LeftButton:
opt = self.__viewItemOption(section)
hitrect = self.style().subElementRect(QStyle.SE_ItemViewItemCheckIndicator, opt, self)
if hitrect.contains(pos):
self.__sectionPressed = section
event.accept()
return
super().mousePressEvent(event)
def mouseReleaseEvent(self, event: QMouseEvent) -> None:
pos = event.pos()
section = self.logicalIndexAt(pos)
if section == -1 or not self.isSectionCheckable(section) \
or self.__sectionPressed != section:
super().mouseReleaseEvent(event)
return
if event.button() == Qt.LeftButton:
opt = self.__viewItemOption(section)
hitrect = self.style().subElementRect(QStyle.SE_ItemViewItemCheckIndicator, opt, self)
if hitrect.contains(pos):
state = self.sectionCheckState(section)
newstate = Qt.Checked if state == Qt.Unchecked else Qt.Unchecked
model = self.model()
model.setHeaderData(
section, self.orientation(), newstate, Qt.CheckStateRole)
return
super().mouseReleaseEvent(event)
def isSectionCheckable(self, index: int) -> bool:
model = self.model()
if model is None: # pragma: no cover
return False
checkstate = model.headerData(index, self.orientation(), Qt.CheckStateRole)
return checkstate is not None
def sectionCheckState(self, index: int) -> Qt.CheckState | None:
model = self.model()
if model is None: # pragma: no cover
return None
checkstate = model.headerData(index, self.orientation(), Qt.CheckStateRole)
if checkstate is None:
return None
try:
return Qt.CheckState(checkstate)
except TypeError: # pragma: no cover
return None
def __viewItemOption(self, index: int) -> QStyleOptionViewItem:
opt = QStyleOptionHeader()
self.initStyleOption(opt)
self.initStyleOptionForIndex(opt, index)
pos = self.sectionViewportPosition(index)
size = self.sectionSize(index)
if self.orientation() == Qt.Horizontal:
rect = QRect(pos, 0, size, self.height())
else:
rect = QRect(0, pos, self.width(), size)
optindicator = QStyleOptionViewItem()
optindicator.initFrom(self)
optindicator.rect = rect
optindicator.font = self.font()
optindicator.fontMetrics = opt.fontMetrics
optindicator.features = QStyleOptionViewItem.HasCheckIndicator
if not opt.icon.isNull():
optindicator.icon = opt.icon
optindicator.features |= QStyleOptionViewItem.HasDecoration
return optindicator
def sectionSizeFromContents(self, logicalIndex: int) -> QSize:
style = self.style()
opt = QStyleOptionHeader()
self.initStyleOption(opt)
self.initStyleOptionForIndex(opt, logicalIndex)
sh = style.sizeFromContents(QStyle.CT_HeaderSection, opt,
QSize(), self)
optindicator = QStyleOptionViewItem()
optindicator.initFrom(self)
optindicator.font = self.font()
optindicator.fontMetrics = opt.fontMetrics
optindicator.features = QStyleOptionViewItem.HasCheckIndicator
optindicator.rect = opt.rect
indicator_rect = style.subElementRect(
QStyle.SE_ItemViewItemCheckIndicator, optindicator, self)
return QSize(sh.width() + indicator_rect.width() + 4,
max(sh.height(), indicator_rect.height()))
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