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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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4
Libraries/LibGUI/BreadcrumbBar.cpp
View file

@ -74,12 +74,10 @@ void BreadcrumbBar::append_segment(const String& text, const Gfx::Bitmap* icon,
on_segment_click(index);
};
button.set_size_policy(SizePolicy::Fixed, SizePolicy::Fixed);
auto button_text_width = button.font().width(text);
auto icon_width = icon ? icon->width() : 0;
auto icon_padding = icon ? 4 : 0;
button.set_preferred_size(button_text_width + icon_width + icon_padding + 16, 16 + 8);
button.set_fixed_size(button_text_width + icon_width + icon_padding + 16, 16 + 8);
Segment segment { icon, text, data, button.make_weak_ptr<GUI::Button>() };