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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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9
Applications/PixelPaint/PenTool.cpp
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@ -106,18 +106,15 @@ GUI::Widget* PenTool::get_properties_widget()
m_properties_widget->set_layout<GUI::VerticalBoxLayout>();
auto& thickness_container = m_properties_widget->add<GUI::Widget>();
thickness_container.set_size_policy(GUI::SizePolicy::Fill, GUI::SizePolicy::Fixed);
thickness_container.set_preferred_size(0, 20);
thickness_container.set_fixed_height(20);
thickness_container.set_layout<GUI::HorizontalBoxLayout>();
auto& thickness_label = thickness_container.add<GUI::Label>("Thickness:");
thickness_label.set_text_alignment(Gfx::TextAlignment::CenterLeft);
thickness_label.set_size_policy(GUI::SizePolicy::Fixed, GUI::SizePolicy::Fixed);
thickness_label.set_preferred_size(80, 20);
thickness_label.set_fixed_size(80, 20);
auto& thickness_slider = thickness_container.add<GUI::HorizontalSlider>();
thickness_slider.set_size_policy(GUI::SizePolicy::Fill, GUI::SizePolicy::Fixed);
thickness_slider.set_preferred_size(0, 20);
thickness_slider.set_fixed_height(20);
thickness_slider.set_range(1, 20);
thickness_slider.set_value(m_thickness);
thickness_slider.on_value_changed = [this](int value) {