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Enhance thread navigation with improved expand/collapse behavior

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Major improvements to threaded conversation navigation:

- Add Shift+Left shortcut to navigate to thread root from any reply
- Fix navigation state synchronization using accessibility flags instead of Qt's isExpanded()
- Implement proper child item flag management (selectable/non-selectable)
- Add comprehensive scrollToItem() calls for better focus management
- Enhance navigation methods with safety checks and proper state handling
- Force visual refresh attempts to work around Qt display sync issues

Navigation improvements:
- Right Arrow: Expand thread or move to first child when expanded
- Left Arrow: Collapse thread or move to parent
- Shift+Left: Jump to thread root from anywhere in the thread
- All navigation properly skips collapsed items

Known Qt quirk documented: Visual display may occasionally require
double-collapse cycle due to Qt tree widget display synchronization,
but navigation logic works correctly after first collapse.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>
This commit is contained in:
Storm Dragon
2025-07-21 10:07:41 -04:00
parent ed7de5dafa
commit 1391d0c66f
3 changed files with 129 additions and 47 deletions
Download Patch File Download Diff File Expand all files Collapse all files

12
CLAUDE.md
View File

@@ -185,13 +185,21 @@ Timeline Item: "Alice posted: Hello world (3 replies, collapsed)"
```
**Key Behaviors:**
- Right Arrow: Expand thread, announce "expanded"
- Left Arrow: Collapse thread, announce "collapsed"
- Right Arrow: Expand thread, announce "expanded" / Move to first child when expanded
- Left Arrow: Collapse thread, announce "collapsed" / Move to parent
- Shift+Left Arrow: Navigate to thread root from any reply
- Down Arrow: Next item (skip collapsed children)
- Up Arrow: Previous item
- Page Down/Up: Jump 5 items
- Home/End: First/last item
### Known Qt Tree Widget Display Quirk
Due to Qt's visual display synchronization, thread collapse may require double-operation:
- Navigation logic works correctly after first collapse (skips collapsed items)
- Visual display may need expand→collapse cycle to fully sync
- Workaround: Navigate to root with Shift+Left, then Left→Right→Left if needed
### AccessibleTreeWidget Requirements
- Inherit from QTreeWidget
- Override keyPressEvent for custom navigation

14
README.md
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@@ -82,6 +82,9 @@ Bifrost includes a sophisticated sound system with:
### Navigation
- **Arrow Keys**: Navigate through posts
- **Right Arrow**: Expand thread / Move to first child when expanded
- **Left Arrow**: Collapse thread / Move to parent
- **Shift+Left Arrow**: Navigate to thread root from any reply
- **Page Up/Down**: Jump multiple posts
- **Home/End**: Go to first/last post
- **Enter**: Expand/collapse threads, or vote in polls
@@ -156,6 +159,17 @@ Bifrost includes comprehensive poll support with full accessibility:
- Thread expansion/collapse with audio feedback
- Poll creation and voting with full accessibility support
### Known Qt Display Quirk
Due to a Qt tree widget display synchronization issue, thread collapse may occasionally require a double-operation for the visual display to fully sync:
**If collapse appears incomplete:**
1. Navigate to thread root post (use Shift+Left from any reply)
2. Press Left to collapse → announces "collapsed"
3. Press Right then Left again → now fully collapsed visually
Note: Navigation logic works correctly after the first collapse (arrow keys will skip collapsed replies), but the visual display may need the extra cycle to sync.
## Sound Pack Creation and Installation
### Creating Custom Sound Packs

150
src/accessibility/accessible_tree.py
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@@ -70,44 +70,55 @@ class AccessibleTreeWidget(QTreeWidget):
if key == Qt.Key_Right:
# Right Arrow (with or without Shift): Expand thread
if current.childCount() > 0 and not current.isExpanded():
# Use Qt's built-in expand method
self.expandItem(current)
# Keep focus on the same item
self.setCurrentItem(current)
self.scrollToItem(current) # Prevent jumping to bottom
self.announce_item_state(current, "expanded")
return
# If already expanded or no children, move to first child (only without Shift)
elif current.childCount() > 0 and current.isExpanded() and not has_shift:
first_child = current.child(0)
if first_child:
self.setCurrentItem(first_child)
self.scrollToItem(first_child)
if current.childCount() > 0:
if not current.isExpanded():
# Use Qt's built-in expand method - it will trigger on_item_expanded
self.expandItem(current)
# Force immediate update to ensure state synchronization
self.update_child_accessibility(current, True)
return
# If already expanded and no shift, move to first child
elif not has_shift:
first_child = current.child(0)
if first_child and self.is_item_navigable(first_child):
self.setCurrentItem(first_child)
self.scrollToItem(first_child)
return
elif key == Qt.Key_Left:
# Shift+Left or plain Left: Collapse thread if expanded
if current.childCount() > 0 and current.isExpanded():
# Try direct setExpanded(False) instead of collapseItem()
current.setExpanded(False)
# Keep focus on the same item
self.setCurrentItem(current)
self.scrollToItem(current)
self.announce_item_state(current, "collapsed")
return
# Plain Left only: move to parent if already collapsed
elif current.parent() and not has_shift:
parent_item = current.parent()
self.setCurrentItem(parent_item)
self.scrollToItem(parent_item) # Ensure parent stays visible
return
if has_shift:
# Shift+Left: Just navigate to root thread parent
# (user can collapse manually from there for reliable behavior)
root_parent = self.get_root_parent(current)
if root_parent and root_parent != current:
# Move focus to the root parent
self.setCurrentItem(root_parent)
self.scrollToItem(root_parent)
return
else:
# Plain Left: Collapse current item if expanded, otherwise move to parent
if current.childCount() > 0 and current.isExpanded():
# Collapse current item - this will trigger on_item_collapsed
self.collapseItem(current)
# Force immediate update to ensure state synchronization
self.update_child_accessibility(current, False)
# Force visual refresh to sync display with logical state
self.repaint()
self.update()
return
elif current.parent():
# Move to immediate parent
parent_item = current.parent()
self.setCurrentItem(parent_item)
self.scrollToItem(parent_item)
return
elif key == Qt.Key_Down:
# Move to next visible item (skip collapsed children)
next_item = self.get_next_visible_item(current)
if next_item:
self.setCurrentItem(next_item)
self.scrollToItem(next_item)
return
elif key == Qt.Key_Up:
@@ -115,6 +126,7 @@ class AccessibleTreeWidget(QTreeWidget):
prev_item = self.get_previous_visible_item(current)
if prev_item:
self.setCurrentItem(prev_item)
self.scrollToItem(prev_item)
return
elif key == Qt.Key_PageDown:
@@ -127,6 +139,7 @@ class AccessibleTreeWidget(QTreeWidget):
else:
break
self.setCurrentItem(target)
self.scrollToItem(target)
return
elif key == Qt.Key_PageUp:
@@ -139,6 +152,7 @@ class AccessibleTreeWidget(QTreeWidget):
else:
break
self.setCurrentItem(target)
self.scrollToItem(target)
return
elif key == Qt.Key_Home:
@@ -146,6 +160,7 @@ class AccessibleTreeWidget(QTreeWidget):
first_item = self.topLevelItem(0)
if first_item:
self.setCurrentItem(first_item)
self.scrollToItem(first_item)
return
elif key == Qt.Key_End:
@@ -153,6 +168,7 @@ class AccessibleTreeWidget(QTreeWidget):
last_item = self.get_last_visible_item()
if last_item:
self.setCurrentItem(last_item)
self.scrollToItem(last_item)
return
# Only fall back to default behavior if we didn't handle the key
@@ -162,9 +178,14 @@ class AccessibleTreeWidget(QTreeWidget):
def get_next_visible_item(self, item: QTreeWidgetItem) -> QTreeWidgetItem:
"""Get the next visible item in the tree"""
# If item has children and is expanded, go to first child
if item.childCount() > 0 and item.isExpanded():
return item.child(0)
if not item:
return None
# If item has children, check if first child is navigable (handles expansion state)
if item.childCount() > 0:
first_child = item.child(0)
if first_child and self.is_item_navigable(first_child):
return first_child
# Otherwise, find next sibling or ancestor's sibling
current = item
@@ -174,20 +195,27 @@ class AccessibleTreeWidget(QTreeWidget):
# Find next sibling
index = parent.indexOfChild(current)
if index + 1 < parent.childCount():
return parent.child(index + 1)
next_sibling = parent.child(index + 1)
if next_sibling and self.is_item_navigable(next_sibling):
return next_sibling
# No more siblings, go up to parent
current = parent
else:
# Top-level item, find next top-level item
index = self.indexOfTopLevelItem(current)
if index + 1 < self.topLevelItemCount():
return self.topLevelItem(index + 1)
next_item = self.topLevelItem(index + 1)
if next_item and self.is_item_navigable(next_item):
return next_item
# No more items
return None
return None
def get_previous_visible_item(self, item: QTreeWidgetItem) -> QTreeWidgetItem:
"""Get the previous visible item in the tree"""
if not item:
return None
parent = item.parent()
if parent:
@@ -196,25 +224,34 @@ class AccessibleTreeWidget(QTreeWidget):
if index > 0:
# Get previous sibling and its last visible descendant
prev_sibling = parent.child(index - 1)
return self.get_last_visible_descendant(prev_sibling)
if prev_sibling and self.is_item_navigable(prev_sibling):
return self.get_last_visible_descendant(prev_sibling)
else:
# No previous sibling, go to parent
return parent
if self.is_item_navigable(parent):
return parent
else:
# Top-level item
index = self.indexOfTopLevelItem(item)
if index > 0:
# Get previous top-level item and its last visible descendant
prev_item = self.topLevelItem(index - 1)
return self.get_last_visible_descendant(prev_item)
if prev_item and self.is_item_navigable(prev_item):
return self.get_last_visible_descendant(prev_item)
return None
def get_last_visible_descendant(self, item: QTreeWidgetItem) -> QTreeWidgetItem:
"""Get the last visible descendant of an item"""
if item.childCount() > 0 and item.isExpanded():
# Get the last child and its last visible descendant
if not item or not self.is_item_navigable(item):
return None
# Check if any children are navigable (handles expansion state via accessibility)
if item.childCount() > 0:
# Get the last child and check if it's navigable
last_child = item.child(item.childCount() - 1)
return self.get_last_visible_descendant(last_child)
if last_child and self.is_item_navigable(last_child):
result = self.get_last_visible_descendant(last_child)
return result if result else item
return item
def get_last_visible_item(self) -> QTreeWidgetItem:
@@ -241,13 +278,18 @@ class AccessibleTreeWidget(QTreeWidget):
for i in range(item.childCount()):
child = item.child(i)
if visible:
# Make child accessible
child.setFlags(child.flags() | Qt.ItemIsEnabled)
# Make child accessible and ensure proper selection
child.setFlags(child.flags() | Qt.ItemIsEnabled | Qt.ItemIsSelectable)
child.setData(0, Qt.AccessibleDescriptionRole, "") # Clear hidden marker
# Recursively handle nested children
self.update_child_accessibility(child, child.isExpanded())
else:
# Hide from screen readers but keep in tree
# Hide from screen readers and navigation
child.setData(0, Qt.AccessibleDescriptionRole, "hidden")
# Don't disable completely as it affects navigation
# Remove selectable flag - collapsed items should not be navigable
child.setFlags((child.flags() | Qt.ItemIsEnabled) & ~Qt.ItemIsSelectable)
# Hide all nested children too
self.update_child_accessibility(child, False)
def announce_item_state(self, item: QTreeWidgetItem, state: str):
"""Announce item state change for screen readers"""
@@ -291,4 +333,22 @@ class AccessibleTreeWidget(QTreeWidget):
while current.parent():
depth += 1
current = current.parent()
return depth
return depth
def get_root_parent(self, item: QTreeWidgetItem) -> QTreeWidgetItem:
"""Get the root parent (top-level item) of any item in a thread"""
current = item
while current.parent():
current = current.parent()
return current
def is_item_navigable(self, item: QTreeWidgetItem) -> bool:
"""Check if an item is safe to navigate to"""
if not item:
return False
# Check if item is enabled and selectable, and not hidden
flags = item.flags()
is_hidden = item.data(0, Qt.AccessibleDescriptionRole) == "hidden"
is_enabled = bool(flags & Qt.ItemIsEnabled)
is_selectable = bool(flags & Qt.ItemIsSelectable)
return is_enabled and is_selectable and not is_hidden