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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

@ -75,7 +75,6 @@ public:
m_root_container = m_slider_window->set_main_widget<GUI::Label>();
m_root_container->set_fill_with_background_color(true);
m_root_container->set_size_policy(GUI::SizePolicy::Fill, GUI::SizePolicy::Fill);
m_root_container->set_layout<GUI::VerticalBoxLayout>();
m_root_container->layout()->set_margins({ 0, 4, 0, 4 });
m_root_container->layout()->set_spacing(0);
@ -84,8 +83,7 @@ public:
m_root_container->set_frame_shadow(Gfx::FrameShadow::Raised);
m_percent_box = m_root_container->add<GUI::CheckBox>("\xE2\x84\xB9");
m_percent_box->set_size_policy(GUI::SizePolicy::Fixed, GUI::SizePolicy::Fixed);
m_percent_box->set_preferred_size(27, 16);
m_percent_box->set_fixed_size(27, 16);
m_percent_box->set_checked(false);
m_percent_box->set_tooltip("Show percent");
m_percent_box->on_checked = [&](bool show_percent) {
@ -105,7 +103,6 @@ public:
m_slider->set_max(20);
m_slider->set_value(0);
m_slider->set_knob_size_mode(GUI::Slider::KnobSizeMode::Proportional);
m_slider->set_size_policy(GUI::SizePolicy::Fill, GUI::SizePolicy::Fill);
m_slider->on_value_changed = [&](int value) {
int volume = clamp((20 - value) * 5, 0, 100);
float volume_log = ((volume / 100.0f) * (volume / 100.0f)) * 100.0f;
@ -114,8 +111,7 @@ public:
};
m_mute_box = m_root_container->add<GUI::CheckBox>("\xE2\x9D\x8C");
m_mute_box->set_size_policy(GUI::SizePolicy::Fixed, GUI::SizePolicy::Fixed);
m_mute_box->set_preferred_size(27, 16);
m_mute_box->set_fixed_size(27, 16);
m_mute_box->set_checked(false);
m_mute_box->set_tooltip("Mute");
m_mute_box->on_checked = [&](bool is_muted) {