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LibGUI: Recheck size excesses when scrollbars become visible

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Fixes edge cases in which hidden scrollbars could become visible
and obscure content or fail to hide when no longer needed
This commit is contained in:
thankyouverycool 2021-02-17 12:15:52 -05:00 committed by Andreas Kling
parent 8789a91a4e
commit 2df219d608
Notes: sideshowbarker 2024-07-18 22:05:24 +09:00 
Author: https://github.com/thankyouverycool
Commit: https://github.com/SerenityOS/serenity/commit/2df219d608b
Pull-request: https://github.com/SerenityOS/serenity/pull/5434
2 changed files with 23 additions and 15 deletions
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37
Userland/Libraries/LibGUI/ScrollableWidget.cpp
View file

@ -106,31 +106,38 @@ Gfx::IntSize ScrollableWidget::available_size() const
return { available_width, available_height };
}
void ScrollableWidget::update_scrollbar_ranges()
Gfx::IntSize ScrollableWidget::excess_size() const
{
auto available_size = this->available_size();
int excess_height = max(0, m_content_size.height() - available_size.height());
int excess_width = max(0, m_content_size.width() - available_size.width());
return { excess_width, excess_height };
}
auto vertical_initial_visibility = m_vertical_scrollbar->is_visible();
auto horizontal_initial_visibility = m_horizontal_scrollbar->is_visible();
void ScrollableWidget::update_scrollbar_ranges()
{
if (should_hide_unnecessary_scrollbars()) {
m_vertical_scrollbar->set_visible(excess_height > 0);
m_horizontal_scrollbar->set_visible(excess_width > 0);
if (excess_size().height() - height_occupied_by_horizontal_scrollbar() <= 0 && excess_size().width() - width_occupied_by_vertical_scrollbar() <= 0) {
m_horizontal_scrollbar->set_visible(false);
m_vertical_scrollbar->set_visible(false);
} else {
auto vertical_initial_visibility = m_vertical_scrollbar->is_visible();
auto horizontal_initial_visibility = m_horizontal_scrollbar->is_visible();
m_vertical_scrollbar->set_visible(excess_size().height() > 0);
m_horizontal_scrollbar->set_visible(excess_size().width() > 0);
if (m_vertical_scrollbar->is_visible() != vertical_initial_visibility)
m_horizontal_scrollbar->set_visible(excess_size().width() > 0);
if (m_horizontal_scrollbar->is_visible() != horizontal_initial_visibility)
m_vertical_scrollbar->set_visible(excess_size().height() > 0);
}
}
if (m_vertical_scrollbar->is_visible() != vertical_initial_visibility || m_horizontal_scrollbar->is_visible() != horizontal_initial_visibility) {
available_size = this->available_size();
excess_height = max(0, m_content_size.height() - available_size.height());
excess_width = max(0, m_content_size.width() - available_size.width());
}
m_horizontal_scrollbar->set_range(0, excess_width);
m_horizontal_scrollbar->set_range(0, excess_size().width());
m_horizontal_scrollbar->set_page_step(visible_content_rect().width() - m_horizontal_scrollbar->step());
m_vertical_scrollbar->set_range(0, excess_height);
m_vertical_scrollbar->set_range(0, excess_size().height());
m_vertical_scrollbar->set_page_step(visible_content_rect().height() - m_vertical_scrollbar->step());
}

1
Userland/Libraries/LibGUI/ScrollableWidget.h
View file

@ -57,6 +57,7 @@ public:
bool is_scrollbars_enabled() const { return m_scrollbars_enabled; }
Gfx::IntSize available_size() const;
Gfx::IntSize excess_size() const;
ScrollBar& vertical_scrollbar() { return *m_vertical_scrollbar; }
const ScrollBar& vertical_scrollbar() const { return *m_vertical_scrollbar; }