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Cache heightForWIdth calculation as recommended by Qt docs

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Kovid Goyal 2025-04-12 07:38:33 +05:30
parent bbe90eac79
commit 68032fc59a
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1 changed files with 15 additions and 1 deletions
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16
src/calibre/gui2/widgets2.py
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@ -408,10 +408,22 @@ class FlowLayout(QLayout): # {{{
def __init__(self, parent=None): def __init__(self, parent=None):
QLayout.__init__(self, parent) QLayout.__init__(self, parent)
self.items = [] self.items = []
self.height_for_width_cache = {}
def clear_caches(self):
self.height_for_width_cache.clear()
def addItem(self, item): def addItem(self, item):
self.clear_caches()
self.items.append(item) self.items.append(item)
def isEmpty(self):
return not bool(self.items)
def invalidate(self):
self.clear_caches()
super().invalidate()
def itemAt(self, idx): def itemAt(self, idx):
try: try:
return self.items[idx] return self.items[idx]
@ -432,7 +444,9 @@ class FlowLayout(QLayout): # {{{
return True return True
def heightForWidth(self, width): def heightForWidth(self, width):
return self.do_layout(QRect(0, 0, width, 0), apply_geometry=False) if (ans := self.height_for_width_cache.get(width)) is None:
ans = self.height_for_width_cache[width] = self.do_layout(QRect(0, 0, width, 0), apply_geometry=False)
return ans
def setGeometry(self, rect): def setGeometry(self, rect):
QLayout.setGeometry(self, rect) QLayout.setGeometry(self, rect)