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gui/log: work around Qt scrolling bug. Closes #151

This commit is contained in:
Sebastien Bourdeauducq 2015-10-31 10:25:01 +08:00
parent d8b98ae5d4
commit 0a36b03a12
1 changed files with 19 additions and 4 deletions
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23
artiq/gui/log.py
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@ -199,22 +199,37 @@ class LogDock(dockarea.Dock):
def rows_inserted_before(self): def rows_inserted_before(self):
scrollbar = self.log.verticalScrollBar() scrollbar = self.log.verticalScrollBar()
self.scroll_at_bottom = scrollbar.value() == scrollbar.maximum() self.scroll_value = scrollbar.value()
self.scroll_at_bottom = self.scroll_value == scrollbar.maximum()
def rows_inserted_after(self): def rows_inserted_after(self):
if self.scroll_at_bottom: if self.scroll_at_bottom:
self.log.scrollToBottom() self.log.scrollToBottom()
# HACK:
# Qt intermittently likes to scroll back to the top when rows are removed.
# Work around this by restoring the scrollbar to the previously memorized
# position, after the removal.
# Note that this works because _LogModel always does the insertion right
# before the removal.
def rows_removed(self):
if self.scroll_at_bottom:
self.log.scrollToBottom()
else:
scrollbar = self.log.verticalScrollBar()
scrollbar.setValue(self.scroll_value)
def init_log_model(self, init): def init_log_model(self, init):
table_model = _LogModel(self.log, init) self.table_model = _LogModel(self.log, init)
self.table_model_filter = _LogFilterProxyModel( self.table_model_filter = _LogFilterProxyModel(
getattr(logging, self.filter_level.currentText()), getattr(logging, self.filter_level.currentText()),
self.filter_freetext.text()) self.filter_freetext.text())
self.table_model_filter.setSourceModel(table_model) self.table_model_filter.setSourceModel(self.table_model)
self.log.setModel(self.table_model_filter) self.log.setModel(self.table_model_filter)
self.table_model_filter.rowsAboutToBeInserted.connect(self.rows_inserted_before) self.table_model_filter.rowsAboutToBeInserted.connect(self.rows_inserted_before)
self.table_model_filter.rowsInserted.connect(self.rows_inserted_after) self.table_model_filter.rowsInserted.connect(self.rows_inserted_after)
return table_model self.table_model_filter.rowsRemoved.connect(self.rows_removed)
return self.table_model
def save_state(self): def save_state(self):
return {"min_level_idx": self.filter_level.currentIndex()} return {"min_level_idx": self.filter_level.currentIndex()}