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Cover Grid: Improve scroll wheel based scrolling.

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On windows and linux a single "tick" of the wheel now scrolls by about
half a row. On OS X, scrolling is pixel based, so as you scroll faster,
more content is scrolled.
This commit is contained in:
Kovid Goyal 2014-11-06 12:36:58 +05:30
parent 264312d2b7
commit c05bb2ee69
1 changed files with 16 additions and 1 deletions
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17
src/calibre/gui2/library/alternate_views.py
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@ -6,7 +6,7 @@ from __future__ import (unicode_literals, division, absolute_import,
__license__ = 'GPL v3' __license__ = 'GPL v3'
__copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>' __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
import itertools, operator, os import itertools, operator, os, math
from types import MethodType from types import MethodType
from threading import Event, Thread from threading import Event, Thread
from Queue import LifoQueue from Queue import LifoQueue
@ -981,4 +981,19 @@ class GridView(QListView):
return QItemSelectionModel.ClearAndSelect | QItemSelectionModel.Rows return QItemSelectionModel.ClearAndSelect | QItemSelectionModel.Rows
return super(GridView, self).selectionCommand(index, event) return super(GridView, self).selectionCommand(index, event)
def wheelEvent(self, ev):
if ev.phase() != Qt.ScrollUpdate:
return
number_of_pixels = ev.pixelDelta()
number_of_degrees = ev.angleDelta() / 8
b = self.verticalScrollBar()
if number_of_pixels.isNull():
dy = number_of_degrees.y() / 15.0
# Scroll by approximately half a row
dy = int(math.ceil((dy) * b.singleStep() / 2.0))
else:
dy = number_of_pixels.y()
if abs(dy) > 0:
b.setValue(b.value() - dy)
# }}} # }}}