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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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12
Libraries/LibGUI/ScrollableWidget.cpp
View File

@@ -71,20 +71,20 @@ void ScrollableWidget::mousewheel_event(MouseEvent& event)
void ScrollableWidget::custom_layout()
{
auto inner_rect = frame_inner_rect_for_size(size());
int height_wanted_by_horizontal_scrollbar = m_horizontal_scrollbar->is_visible() ? m_horizontal_scrollbar->preferred_size().height() : 0;
int width_wanted_by_vertical_scrollbar = m_vertical_scrollbar->is_visible() ? m_vertical_scrollbar->preferred_size().width() : 0;
int height_wanted_by_horizontal_scrollbar = m_horizontal_scrollbar->is_visible() ? m_horizontal_scrollbar->min_height() : 0;
int width_wanted_by_vertical_scrollbar = m_vertical_scrollbar->is_visible() ? m_vertical_scrollbar->min_width() : 0;
m_vertical_scrollbar->set_relative_rect(
inner_rect.right() + 1 - m_vertical_scrollbar->preferred_size().width(),
inner_rect.right() + 1 - m_vertical_scrollbar->min_width(),
inner_rect.top(),
m_vertical_scrollbar->preferred_size().width(),
m_vertical_scrollbar->min_width(),
inner_rect.height() - height_wanted_by_horizontal_scrollbar);
m_horizontal_scrollbar->set_relative_rect(
inner_rect.left(),
inner_rect.bottom() + 1 - m_horizontal_scrollbar->preferred_size().height(),
inner_rect.bottom() + 1 - m_horizontal_scrollbar->min_height(),
inner_rect.width() - width_wanted_by_vertical_scrollbar,
m_horizontal_scrollbar->preferred_size().height());
m_horizontal_scrollbar->min_height());
m_corner_widget->set_visible(m_vertical_scrollbar->is_visible() && m_horizontal_scrollbar->is_visible());
if (m_corner_widget->is_visible()) {