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LibWeb: Join start and end after deleting selection.

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asynts 2020-12-03 22:41:26 +01:00 committed by Andreas Kling
parent a94a1d9f9e
commit 4df0eeaa3d
Notes: sideshowbarker 2024-07-19 00:56:59 +09:00 
Author: https://github.com/asynts
Commit: https://github.com/SerenityOS/serenity/commit/4df0eeaa3db
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
1 changed files with 38 additions and 27 deletions
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65
Libraries/LibWeb/Page/EditEventHandler.cpp
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@ -38,46 +38,57 @@
namespace Web {
// This method is quite convoluted but this is necessary to make editing feel intuitive.
void EditEventHandler::handle_delete(DOM::Range range)
{
auto* start = downcast<DOM::Text>(range.start().node());
auto* end = downcast<DOM::Text>(range.end().node());
// 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;
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);
if (start == end || start->next_sibling() == end) {
// If the start and end text nodes are now immediate siblings, merge the remainders into one.
if (start == end) {
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 {
// Otherwise, remove parts from both nodes.
// 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;
start->set_data(start->data().substring_view(0, range.start().offset()));
start->invalidate_style();
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);
end->set_data(end->data().substring_view(range.end().offset()));
end->invalidate_style();
// Join the parent nodes of start and end.
DOM::Node *insert_after = start, *remove_from = end, *parent_of_end = end->parent();
while (remove_from) {
auto* next_sibling = remove_from->next_sibling();
remove_from->parent()->remove_child(*remove_from);
insert_after->parent()->insert_before(*remove_from, *insert_after);
insert_after = remove_from;
remove_from = next_sibling;
}
if (!parent_of_end->has_children()) {
if (parent_of_end->parent())
parent_of_end->parent()->remove_child(*parent_of_end);
}
// Join the start and end nodes.
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->parent()->remove_child(*end);
}
// FIXME: When nodes are removed from the DOM, the associated layout nodes become stale and still