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GTableView: Only paint the currently visible table rows

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This makes painting way faster for models with large amounts of data.
This commit is contained in:
Andreas Kling 2019-09-18 14:10:09 +02:00
parent bd45a55d86
commit 229dbd0ab2
Notes: sideshowbarker 2024-07-19 12:03:22 +09:00
1 changed files with 11 additions and 2 deletions

13
Libraries/LibGUI/GTableView.cpp
View file

@ -260,10 +260,19 @@ void GTableView::paint_event(GPaintEvent& event)
painter.translate(-horizontal_scrollbar().value(), -vertical_scrollbar().value());
int exposed_width = max(content_size().width(), width());
int painted_item_index = 0;
int y_offset = header_height();
for (int row_index = 0; row_index < model()->row_count(); ++row_index) {
int first_visible_row = index_at_event_position(frame_inner_rect().top_left()).row();
int last_visible_row = index_at_event_position(frame_inner_rect().bottom_right()).row();
if (first_visible_row == -1)
first_visible_row = 0;
if (last_visible_row == -1)
last_visible_row = model()->row_count() - 1;
int painted_item_index = first_visible_row;
for (int row_index = first_visible_row; row_index <= last_visible_row; ++row_index) {
bool is_selected_row = selection().contains_row(row_index);
int y = y_offset + painted_item_index * item_height();