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

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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
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3
Applications/IRCClient/IRCAppWindow.cpp
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@ -333,8 +333,7 @@ void IRCAppWindow::setup_widgets()
m_window_list->set_alternating_row_colors(false);
m_window_list->set_model(m_client->client_window_list_model());
m_window_list->set_activates_on_selection(true);
m_window_list->set_size_policy(GUI::SizePolicy::Fixed, GUI::SizePolicy::Fill);
m_window_list->set_preferred_size(100, 0);
m_window_list->set_fixed_width(100);
m_window_list->on_activation = [this](auto& index) {
set_active_window(m_client->window_at(index.row()));
};