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LibWeb: Implement deletion of more complex selections.

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asynts 2020-12-03 18:46:56 +01:00 committed by Andreas Kling
parent b3d7c5bfbc
commit a94a1d9f9e
Notes: sideshowbarker 2024-07-19 00:57:03 +09:00 
Author: https://github.com/asynts
Commit: https://github.com/SerenityOS/serenity/commit/a94a1d9f9eb
Pull-request: https://github.com/SerenityOS/serenity/pull/4318
Reviewed-by: https://github.com/Lubrsi
Reviewed-by: https://github.com/awesomekling
Reviewed-by: https://github.com/linusg
2 changed files with 39 additions and 34 deletions
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72
Libraries/LibWeb/Page/EditEventHandler.cpp
View file

@ -40,45 +40,49 @@ namespace Web {
void EditEventHandler::handle_delete(DOM::Range range)
{
if (range.start().node() != range.end().node()) {
if (range.start().node()->parent() == range.end().node()->parent()) {
// Remove all intermediate nodes.
auto* current = range.start().node()->next_sibling();
while (current != range.end().node()) {
auto* next = current->next_sibling();
current->parent()->remove_child(*current);
current = next;
}
auto* start = downcast<DOM::Text>(range.start().node());
auto* end = downcast<DOM::Text>(range.end().node());
// Join remaining text together.
StringBuilder builder;
builder.append(downcast<DOM::Text>(range.start().node())->data().substring_view(0, range.start().offset()));
builder.append(downcast<DOM::Text>(range.end().node())->data().substring_view(range.end().offset()));
// Remove all the nodes that are fully enclosed in the range.
HashTable<DOM::Node*> queued_for_deletion;
for (auto* node = start->next_in_pre_order(); node; node = node->next_in_pre_order()) {
if (node == end)
break;
range.start().node()->parent()->remove_child(*range.end().node());
downcast<DOM::Text>(range.start().node())->set_data(builder.to_string());
queued_for_deletion.set(node);
}
for (auto* parent = start->parent(); parent; parent = parent->parent())
queued_for_deletion.remove(parent);
for (auto* parent = end->parent(); parent; parent = parent->parent())
queued_for_deletion.remove(parent);
for (auto* node : queued_for_deletion)
node->parent()->remove_child(*node);
range.start().node()->invalidate_style();
} else {
TODO();
}
if (start == end || start->next_sibling() == end) {
// If the start and end text nodes are now immediate siblings, merge the remainders into one.
StringBuilder builder;
builder.append(start->data().substring_view(0, range.start().offset()));
builder.append(end->data().substring_view(range.end().offset()));
start->set_data(builder.to_string());
start->invalidate_style();
if (start != end)
start->parent()->remove_child(*end);
} else {
if (is<DOM::Text>(*range.start().node())) {
m_frame.document()->layout_node()->set_selection({});
// Otherwise, remove parts from both nodes.
auto& node = downcast<DOM::Text>(*range.start().node());
start->set_data(start->data().substring_view(0, range.start().offset()));
start->invalidate_style();
StringBuilder builder;
builder.append(node.data().substring_view(0, range.start().offset()));
builder.append(node.data().substring_view(range.end().offset()));
node.set_data(builder.to_string());
node.invalidate_style();
}
end->set_data(end->data().substring_view(range.end().offset()));
end->invalidate_style();
}
// FIXME: We need to remove stale layout nodes when nodes are removed from the DOM. Currently,
// this is the only way to get these to disappear.
// FIXME: When nodes are removed from the DOM, the associated layout nodes become stale and still
// remain in the layout tree. This has to be fixed, this just causes everything to be recomputed
// which really hurts performance.
m_frame.document()->force_layout();
}
@ -96,9 +100,9 @@ void EditEventHandler::handle_insert(DOM::Position position, u32 code_point)
node.invalidate_style();
}
// FIXME: We need to remove stale layout nodes when nodes are removed from the DOM. Currently,
// this is the only way to get these to disappear.
// FIXME: When nodes are removed from the DOM, the associated layout nodes become stale and still
// remain in the layout tree. This has to be fixed, this just causes everything to be recomputed
// which really hurts performance.
m_frame.document()->force_layout();
}
}

1
Libraries/LibWeb/Page/EventHandler.cpp
View file

@ -422,4 +422,5 @@ void EventHandler::set_mouse_event_tracking_layout_node(Layout::Node* layout_nod
else
m_mouse_event_tracking_layout_node = nullptr;
}
}