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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
Services/SystemMenu/ShutdownDialog.cpp
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@ -75,8 +75,7 @@ ShutdownDialog::ShutdownDialog()
auto& header = main.add<GUI::Label>();
header.set_text("What would you like to do?");
header.set_preferred_size(0, 16);
header.set_size_policy(GUI::SizePolicy::Fill, GUI::SizePolicy::Fixed);
header.set_fixed_height(16);
header.set_font(Gfx::Font::default_bold_font());
for (size_t i = 0; i < options.size(); i++) {