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LibGUI: Teach GScrollableWidget how to hide unnecessary scrollbars

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This is now an opt-in mode enabled by calling:

    should_hide_unnecessary_scrollbars(true)

This patch enables the mode for GTreeView and GTableView. :^)
This commit is contained in:
Andreas Kling 2019-09-05 21:37:15 +02:00
parent fb39e46d3d
commit 7a906ab539
4 changed files with 25 additions and 2 deletions
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19
Libraries/LibGUI/GScrollableWidget.cpp
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@ -39,8 +39,17 @@ void GScrollableWidget::custom_layout()
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;
m_vertical_scrollbar->set_relative_rect(inner_rect.right() + 1 - m_vertical_scrollbar->preferred_size().width(), inner_rect.top(), m_vertical_scrollbar->preferred_size().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.width() - m_vertical_scrollbar->preferred_size().width(), width_wanted_by_vertical_scrollbar);
m_vertical_scrollbar->set_relative_rect(
inner_rect.right() + 1 - m_vertical_scrollbar->preferred_size().width(),
inner_rect.top(),
m_vertical_scrollbar->preferred_size().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.width() - width_wanted_by_vertical_scrollbar,
m_horizontal_scrollbar->preferred_size().height());
m_corner_widget->set_visible(m_vertical_scrollbar->is_visible() && m_horizontal_scrollbar->is_visible());
if (m_corner_widget->is_visible()) {
@ -69,9 +78,15 @@ void GScrollableWidget::update_scrollbar_ranges()
int excess_height = max(0, m_content_size.height() - available_size.height());
m_vertical_scrollbar->set_range(0, excess_height);
if (should_hide_unnecessary_scrollbars())
m_vertical_scrollbar->set_visible(excess_height > 0);
int excess_width = max(0, m_content_size.width() - available_size.width());
m_horizontal_scrollbar->set_range(0, excess_width);
if (should_hide_unnecessary_scrollbars())
m_horizontal_scrollbar->set_visible(excess_width > 0);
m_vertical_scrollbar->set_big_step(visible_content_rect().height() - m_vertical_scrollbar->step());
}