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LibGUI: Add a way for GWidgets to do custom layout on child hide/show

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This solves an issue in GScrollableWidget where hiding one of the two
scrollbars needs to trigger a relayout since the other one should grow
into the "shared space" in the bottom right corner.

A GWidget can now override custom_layout() which will be called at any
time we would normally delegate work to the GLayout, e.g on resize
or child visibility changes, size policy changes, etc.
This commit is contained in:
Andreas Kling 2019-09-01 20:51:20 +02:00
parent 77a58119e7
commit b615a5c780
4 changed files with 13 additions and 7 deletions
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12
Libraries/LibGUI/GScrollableWidget.cpp
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@ -33,11 +33,9 @@ void GScrollableWidget::mousewheel_event(GMouseEvent& event)
vertical_scrollbar().set_value(vertical_scrollbar().value() + event.wheel_delta() * 20);
}
void GScrollableWidget::resize_event(GResizeEvent& event)
void GScrollableWidget::custom_layout()
{
auto inner_rect = frame_inner_rect_for_size(event.size());
update_scrollbar_ranges();
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;
@ -51,6 +49,12 @@ void GScrollableWidget::resize_event(GResizeEvent& event)
}
}
void GScrollableWidget::resize_event(GResizeEvent& event)
{
GFrame::resize_event(event);
update_scrollbar_ranges();
}
Size GScrollableWidget::available_size() const
{
int available_width = frame_inner_rect().width() - m_size_occupied_by_fixed_elements.width() - width_occupied_by_vertical_scrollbar();