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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

@ -908,8 +908,7 @@ void TerminalWidget::terminal_did_resize(u16 columns, u16 rows)
m_pixel_height = (frame_thickness() * 2) + (m_inset * 2) + (rows * (font().glyph_height() + m_line_spacing));
if (m_automatic_size_policy) {
set_size_policy(GUI::SizePolicy::Fixed, GUI::SizePolicy::Fixed);
set_preferred_size(m_pixel_width, m_pixel_height);
set_fixed_size(m_pixel_width, m_pixel_height);
}
m_needs_background_fill = true;