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LibGUI: Add Page{Up,Down} support for GlyphMapWidget

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thankyouverycool 2022-12-16 11:45:39 -05:00 • committed by Andreas Kling
parent a98d5c52f8
commit 4c81fbc8c4
1 changed files with 43 additions and 0 deletions
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43
Userland/Libraries/LibGUI/GlyphMapWidget.cpp
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@ -367,6 +367,49 @@ void GlyphMapWidget::keydown_event(KeyEvent& event)
return;
}
{
auto first_visible_row = vertical_scrollbar().value() / vertical_scrollbar().step();
auto last_visible_row = first_visible_row + m_visible_rows;
auto current_row = (m_active_glyph - first_glyph) / columns();
auto page = m_active_glyph;
if (event.key() == KeyCode::Key_PageDown) {
auto current_page = m_active_glyph + m_columns * (last_visible_row - current_row);
auto next_page = m_active_glyph + m_columns * m_visible_rows;
auto remainder = m_active_glyph + m_columns * ((last_glyph - first_glyph) / columns() - current_row);
if (current_row < last_visible_row && current_page <= last_glyph)
page = current_page;
else if (next_page <= last_glyph)
page = next_page;
else if (remainder <= last_glyph)
page = remainder;
else
page = remainder - m_columns; // Bottom rows do not always extend across all columns
if (event.shift())
m_selection.extend_to(page);
set_active_glyph(page, event.shift() ? ShouldResetSelection::No : ShouldResetSelection::Yes);
scroll_to_glyph(m_active_glyph);
return;
}
if (event.key() == KeyCode::Key_PageUp) {
auto current_page = m_active_glyph - m_columns * (current_row - first_visible_row);
auto previous_page = m_active_glyph - m_columns * m_visible_rows;
auto remainder = m_active_glyph - m_columns * current_row;
if (current_row > first_visible_row && current_page >= first_glyph)
page = current_page;
else if (previous_page >= first_glyph)
page = previous_page;
else
page = remainder;
if (event.shift())
m_selection.extend_to(page);
set_active_glyph(page, event.shift() ? ShouldResetSelection::No : ShouldResetSelection::Yes);
scroll_to_glyph(m_active_glyph);
return;
}
}
event.ignore();
}