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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/PixelPaint/main.cpp
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@ -90,8 +90,7 @@ int main(int argc, char** argv)
auto& right_panel = horizontal_container.add<GUI::Widget>();
right_panel.set_fill_with_background_color(true);
right_panel.set_size_policy(GUI::SizePolicy::Fixed, GUI::SizePolicy::Fill);
right_panel.set_preferred_size(230, 0);
right_panel.set_fixed_width(230);
right_panel.set_layout<GUI::VerticalBoxLayout>();
auto& layer_list_widget = right_panel.add<PixelPaint::LayerListWidget>();