/* * Copyright (c) 2018-2021, Andreas Kling * Copyright (c) 2022, the SerenityOS developers. * * SPDX-License-Identifier: BSD-2-Clause */ #include #include #include #include #include #include #include REGISTER_WIDGET(GUI, HorizontalSplitter) REGISTER_WIDGET(GUI, VerticalSplitter) namespace GUI { Splitter::Splitter(Orientation orientation) : m_orientation(orientation) { REGISTER_ENUM_PROPERTY("opportunistic_resizee", opportunisitic_resizee, set_opportunisitic_resizee, OpportunisticResizee, { OpportunisticResizee::First, "First" }, { OpportunisticResizee::Second, "Second" }); set_background_role(ColorRole::Button); set_layout(orientation); set_fill_with_background_color(true); if (m_orientation == Gfx::Orientation::Horizontal) layout()->set_spacing(3); else layout()->set_spacing(4); } void Splitter::paint_event(PaintEvent& event) { Painter painter(*this); painter.add_clip_rect(event.rect()); auto palette = this->palette(); auto paint_knurl = [&](int x, int y) { painter.set_pixel(x, y, palette.threed_shadow1()); painter.set_pixel(x + 1, y, palette.threed_shadow1()); painter.set_pixel(x, y + 1, palette.threed_shadow1()); painter.set_pixel(x + 1, y + 1, palette.threed_highlight()); }; constexpr size_t knurl_width = 2; constexpr size_t knurl_spacing = 1; constexpr size_t knurl_count = 10; constexpr size_t total_knurling_width = knurl_count * (knurl_width + knurl_spacing); if (m_hovered_index.has_value()) painter.fill_rect(m_grabbables[m_hovered_index.value()].paint_rect, palette.hover_highlight()); for (auto& grabbable : m_grabbables) { for (size_t i = 0; i < knurl_count; ++i) { auto& rect = grabbable.paint_rect; int primary = rect.center().primary_offset_for_orientation(m_orientation) - 1; int secondary = rect.center().secondary_offset_for_orientation(m_orientation) - (total_knurling_width / 2) + (i * (knurl_width + knurl_spacing)); if (Desktop::the().system_effects().splitter_knurls()) { if (m_orientation == Gfx::Orientation::Vertical) paint_knurl(secondary, primary); else paint_knurl(primary, secondary); } } } } void Splitter::resize_event(ResizeEvent& event) { Widget::resize_event(event); set_hovered_grabbable(nullptr); } void Splitter::set_hovered_grabbable(Grabbable* grabbable) { if (m_hovered_index.has_value()) { if (grabbable && grabbable->index == m_hovered_index.value()) return; update(m_grabbables[m_hovered_index.value()].paint_rect); } if (grabbable) { m_hovered_index = grabbable->index; update(grabbable->paint_rect); } else { m_hovered_index = {}; } } void Splitter::override_cursor(bool do_override) { if (do_override) { if (!m_overriding_cursor) { set_override_cursor(m_orientation == Orientation::Horizontal ? Gfx::StandardCursor::ResizeColumn : Gfx::StandardCursor::ResizeRow); m_overriding_cursor = true; } } else { if (m_overriding_cursor) { set_override_cursor(Gfx::StandardCursor::None); m_overriding_cursor = false; } } } void Splitter::leave_event(Core::Event&) { if (!m_resizing) override_cursor(false); set_hovered_grabbable(nullptr); } Splitter::Grabbable* Splitter::grabbable_at(Gfx::IntPoint const& position) { for (auto& grabbable : m_grabbables) { if (grabbable.grabbable_rect.contains(position)) return &grabbable; } return nullptr; } void Splitter::mousedown_event(MouseEvent& event) { if (event.button() != MouseButton::Primary) return; auto* grabbable = grabbable_at(event.position()); if (!grabbable) return; m_resizing = true; m_first_resizee = *grabbable->first_widget; m_second_resizee = *grabbable->second_widget; m_first_resizee_start_size = m_first_resizee->size(); m_second_resizee_start_size = m_second_resizee->size(); m_resize_origin = event.position(); VERIFY(layout()); auto spacer = layout()->spacing(); auto splitter = size().primary_size_for_orientation(m_orientation); m_first_resizee_max_size = splitter - spacer - m_second_resizee->calculated_min_size().value_or({ 0, 0 }).primary_size_for_orientation(m_orientation).as_int(); m_second_resizee_max_size = splitter - spacer - m_first_resizee->calculated_min_size().value_or({ 0, 0 }).primary_size_for_orientation(m_orientation).as_int(); } Gfx::IntRect Splitter::rect_between_widgets(GUI::Widget const& first_widget, GUI::Widget const& second_widget, bool honor_grabbable_margins) const { auto first_widget_rect = honor_grabbable_margins ? first_widget.relative_non_grabbable_rect() : first_widget.relative_rect(); auto second_widget_rect = honor_grabbable_margins ? second_widget.relative_non_grabbable_rect() : second_widget.relative_rect(); auto first_edge = first_widget_rect.last_edge_for_orientation(m_orientation); auto second_edge = second_widget_rect.first_edge_for_orientation(m_orientation); Gfx::IntRect rect; rect.set_primary_offset_for_orientation(m_orientation, first_edge + 1); rect.set_primary_size_for_orientation(m_orientation, second_edge - first_edge - 1); rect.set_secondary_offset_for_orientation(m_orientation, 0); rect.set_secondary_size_for_orientation(m_orientation, relative_rect().secondary_size_for_orientation(m_orientation)); return rect; } void Splitter::recompute_grabbables() { auto old_grabbables_count = m_grabbables.size(); m_grabbables.clear(); auto old_hovered_index = m_hovered_index; m_hovered_index = {}; auto child_widgets = this->child_widgets(); child_widgets.remove_all_matching([&](auto& widget) { return !widget.is_visible(); }); m_last_child_count = child_widgets.size(); if (child_widgets.size() < 2) return; size_t start_index = 0; size_t end_index = 1; while (end_index < child_widgets.size()) { auto const& first_widget = child_widgets[start_index]; auto const& second_widget = child_widgets[end_index]; m_grabbables.append(Grabbable { .index = m_grabbables.size(), .grabbable_rect = rect_between_widgets(first_widget, second_widget, true), .paint_rect = rect_between_widgets(first_widget, second_widget, false), .first_widget = first_widget, .second_widget = second_widget, }); ++start_index; ++end_index; } if (old_hovered_index.has_value() && old_grabbables_count == m_grabbables.size()) set_hovered_grabbable(&m_grabbables[old_hovered_index.value()]); } void Splitter::mousemove_event(MouseEvent& event) { auto* grabbable = grabbable_at(event.position()); set_hovered_grabbable(grabbable); if (!m_resizing) { override_cursor(grabbable != nullptr); return; } if (!m_first_resizee || !m_second_resizee) { m_resizing = false; return; } auto delta = (event.position() - m_resize_origin).primary_offset_for_orientation(m_orientation); auto new_first_resizee_size = clamp(m_first_resizee_start_size.primary_size_for_orientation(m_orientation) + delta, 0, m_first_resizee_max_size); auto new_second_resizee_size = clamp(m_second_resizee_start_size.primary_size_for_orientation(m_orientation) - delta, 0, m_second_resizee_max_size); if (m_orientation == Orientation::Horizontal) { if (opportunisitic_resizee() == OpportunisticResizee::First) { m_first_resizee->set_preferred_width(SpecialDimension::OpportunisticGrow); m_second_resizee->set_preferred_width(new_second_resizee_size); } else { VERIFY(opportunisitic_resizee() == OpportunisticResizee::Second); m_second_resizee->set_preferred_width(SpecialDimension::OpportunisticGrow); m_first_resizee->set_preferred_width(new_first_resizee_size); } } else { if (opportunisitic_resizee() == OpportunisticResizee::First) { m_first_resizee->set_preferred_height(SpecialDimension::OpportunisticGrow); m_second_resizee->set_preferred_height(new_second_resizee_size); } else { VERIFY(opportunisitic_resizee() == OpportunisticResizee::Second); m_second_resizee->set_preferred_height(SpecialDimension::OpportunisticGrow); m_first_resizee->set_preferred_height(new_first_resizee_size); } } invalidate_layout(); } void Splitter::did_layout() { recompute_grabbables(); } void Splitter::custom_layout() { auto child_widgets = this->child_widgets(); child_widgets.remove_all_matching([&](auto& widget) { return !widget.is_visible(); }); if (!child_widgets.size()) return; if (m_last_child_count > child_widgets.size()) { bool has_child_to_fill_space = false; for (auto& child : child_widgets) { if (child.preferred_size().primary_size_for_orientation(m_orientation).is_opportunistic_grow()) { has_child_to_fill_space = true; break; } } if (!has_child_to_fill_space) child_widgets.last().set_preferred_size(SpecialDimension::OpportunisticGrow); } } void Splitter::mouseup_event(MouseEvent& event) { if (event.button() != MouseButton::Primary) return; m_resizing = false; m_first_resizee = nullptr; m_second_resizee = nullptr; if (!rect().contains(event.position())) set_override_cursor(Gfx::StandardCursor::None); } }