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LibGUI: Rewrite layout system in terms of min and max sizes

This patch removes size policies and preferred sizes, and replaces them
with min-size and max-size for each widget.

Box layout now works in 3 passes:

    1) Set all items (widgets/spacers) to their min-size
    2) Distribute remaining space evenly, respecting max-size
    3) Place widgets one after the other, adding spacing in between

I've also added convenience helpers for setting a fixed size (which is
the same as setting min-size and max-size to the same value.)

This significantly reduces the verbosity of widget layout and makes GML
a bit more pleasant to write, too. :^)
This commit is contained in:
Andreas Kling 2020-12-30 01:23:32 +01:00
parent b2bba5ce5c
commit 7dc5a3ead8
83 changed files with 444 additions and 957 deletions

View file

@ -93,8 +93,7 @@ HelpWindow::HelpWindow(GUI::Window* parent)
auto& splitter = widget.add<GUI::HorizontalSplitter>();
auto& left_frame = splitter.add<GUI::Frame>();
left_frame.set_layout<GUI::VerticalBoxLayout>().set_margins({ 0, 0, 0, 0 });
left_frame.set_preferred_size(100, 0);
left_frame.set_size_policy(GUI::SizePolicy::Fixed, GUI::SizePolicy::Fill);
left_frame.set_fixed_width(100);
m_listview = left_frame.add<GUI::ListView>();
m_listview->set_activates_on_selection(true);
m_listview->set_model(HelpListModel::create());