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Grid View: Delay rendering on wheel events

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Ignore continuous wheel events, only rendering after the "last" wheel
event, where two wheel event are continuous if they occur within 200
msecs of each other.
This commit is contained in:
Kovid Goyal 2013-08-07 09:54:25 +05:30
parent 6ce79b2d96
commit 798eb321d8
1 changed files with 11 additions and 1 deletions
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12
src/calibre/gui2/library/alternate_views.py
View file

@ -15,7 +15,7 @@
from functools import wraps, partial
from PyQt4.Qt import (
QListView, QSize, QStyledItemDelegate, QModelIndex, Qt, QImage, pyqtSignal,
QListView, QSize, QStyledItemDelegate, QModelIndex, Qt, QImage, pyqtSignal, QTimer,
QPalette, QColor, QItemSelection, QPixmap, QMenu, QApplication, QMimeData, QIcon,
QUrl, QDrag, QPoint, QPainter, QRect, pyqtProperty, QPropertyAnimation, QEasingCurve)
@ -470,6 +470,10 @@ def __init__(self, parent):
self.context_menu = None
self.verticalScrollBar().sliderPressed.connect(self.slider_pressed)
self.verticalScrollBar().sliderReleased.connect(self.slider_released)
self.update_timer = QTimer(self)
self.update_timer.setInterval(200)
self.update_timer.timeout.connect(self.update_viewport)
self.update_timer.setSingleShot(True)
@property
def first_visible_row(self):
@ -491,6 +495,7 @@ def last_visible_row(self):
return ans + (geom.width() // item_width)
def update_viewport(self):
self.ignore_render_requests.clear()
m = self.model()
for r in xrange(self.first_visible_row or 0, self.last_visible_row or (m.count() - 1)):
self.update(m.index(r, 0))
@ -502,6 +507,11 @@ def slider_released(self):
self.ignore_render_requests.clear()
self.update_viewport()
def wheelEvent(self, e):
self.ignore_render_requests.set()
QListView.wheelEvent(self, e)
self.update_timer.start()
def double_clicked(self, index):
d = self.delegate
if d.animating is None and not config['disable_animations']: