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LibGUI: Avoid a bunch of virtual calls during TreeView painting

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The index of the tree column will not change while painting.
Neither will the number of columsn. So avoid a whole bunch of virtual
function calls by caching these two values at the start of painting.
This commit is contained in:
Andreas Kling 2021-05-30 09:03:00 +02:00
parent 594dfaadb9
commit 42b27d9f87
1 changed files with 6 additions and 4 deletions
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10
Userland/Libraries/LibGUI/TreeView.cpp
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@ -160,6 +160,7 @@ void TreeView::traverse_in_paint_order(Callback callback) const
{
VERIFY(model());
auto& model = *this->model();
auto tree_column = model.tree_column();
int indent_level = 1;
int y_offset = 0;
int tree_column_x_offset = this->tree_column_x_offset();
@ -194,7 +195,7 @@ void TreeView::traverse_in_paint_order(Callback callback) const
++indent_level;
int row_count = model.row_count(index);
for (int i = 0; i < row_count; ++i) {
if (traverse_index(model.index(i, model.tree_column(), index)) == IterationDecision::Break)
if (traverse_index(model.index(i, tree_column, index)) == IterationDecision::Break)
return IterationDecision::Break;
}
--indent_level;
@ -202,7 +203,7 @@ void TreeView::traverse_in_paint_order(Callback callback) const
};
int root_count = model.row_count();
for (int root_index = 0; root_index < root_count; ++root_index) {
if (traverse_index(model.index(root_index, model.tree_column(), ModelIndex())) == IterationDecision::Break)
if (traverse_index(model.index(root_index, tree_column, ModelIndex())) == IterationDecision::Break)
break;
}
}
@ -225,6 +226,7 @@ void TreeView::paint_event(PaintEvent& event)
auto visible_content_rect = this->visible_content_rect();
int tree_column = model.tree_column();
int column_count = model.column_count();
int tree_column_x_offset = this->tree_column_x_offset();
int y_offset = column_header().height();
@ -263,7 +265,7 @@ void TreeView::paint_event(PaintEvent& event)
}
int row_width = 0;
for (int column_index = 0; column_index < model.column_count(); ++column_index) {
for (int column_index = 0; column_index < column_count; ++column_index) {
if (!column_header().is_section_visible(column_index))
continue;
row_width += this->column_width(column_index) + horizontal_padding() * 2;
@ -278,7 +280,7 @@ void TreeView::paint_event(PaintEvent& event)
painter.fill_rect(row_rect, background_color);
int x_offset = 0;
for (int column_index = 0; column_index < model.column_count(); ++column_index) {
for (int column_index = 0; column_index < column_count; ++column_index) {
if (!column_header().is_section_visible(column_index))
continue;
int column_width = this->column_width(column_index);