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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

@ -49,7 +49,6 @@ void KeyboardMapperWidget::create_frame()
{
set_fill_with_background_color(true);
set_layout<GUI::VerticalBoxLayout>();
set_size_policy(GUI::SizePolicy::Fill, GUI::SizePolicy::Fill);
layout()->set_margins({ 4, 4, 4, 4 });
auto& main_widget = add<GUI::Widget>();
@ -105,14 +104,12 @@ void KeyboardMapperWidget::create_frame()
// Action Buttons
auto& bottom_widget = add<GUI::Widget>();
bottom_widget.set_layout<GUI::HorizontalBoxLayout>();
bottom_widget.set_size_policy(GUI::SizePolicy::Fill, GUI::SizePolicy::Fixed);
bottom_widget.set_preferred_size(0, 40);
bottom_widget.set_fixed_height(40);
// Map Selection
m_map_group = bottom_widget.add<GUI::Widget>();
m_map_group->set_layout<GUI::HorizontalBoxLayout>();
m_map_group->set_size_policy(GUI::SizePolicy::Fixed, GUI::SizePolicy::Fill);
m_map_group->set_preferred_size(250, 0);
m_map_group->set_fixed_width(250);
auto& radio_map = m_map_group->add<GUI::RadioButton>("Default");
radio_map.set_name("map");
@ -139,8 +136,7 @@ void KeyboardMapperWidget::create_frame()
auto& ok_button = bottom_widget.add<GUI::Button>();
ok_button.set_text("Save");
ok_button.set_size_policy(GUI::SizePolicy::Fixed, GUI::SizePolicy::Fill);
ok_button.set_preferred_size(80, 0);
ok_button.set_fixed_width(80);
ok_button.on_click = [this](auto) {
save();
};