diff options
Diffstat (limited to 'src/components/draglistbox.cpp')
| -rw-r--r-- | src/components/draglistbox.cpp | 141 |
1 files changed, 141 insertions, 0 deletions
diff --git a/src/components/draglistbox.cpp b/src/components/draglistbox.cpp new file mode 100644 index 0000000..492abc3 --- /dev/null +++ b/src/components/draglistbox.cpp @@ -0,0 +1,141 @@ +#include "draglistbox.hpp" + +DragListBox::DragListBox() { + drag_dest_set(m_entries, Gtk::DEST_DEFAULT_MOTION | Gtk::DEST_DEFAULT_DROP, Gdk::ACTION_MOVE); +} + +void DragListBox::row_drag_begin(Gtk::Widget *widget, const Glib::RefPtr<Gdk::DragContext> &context) { + m_drag_row = dynamic_cast<Gtk::ListBoxRow *>(widget->get_ancestor(GTK_TYPE_LIST_BOX_ROW)); + + auto alloc = m_drag_row->get_allocation(); + auto surface = Cairo::ImageSurface::create(Cairo::FORMAT_ARGB32, alloc.get_width(), alloc.get_height()); + auto cr = Cairo::Context::create(surface); + + m_drag_row->get_style_context()->add_class("drag-icon"); + gtk_widget_draw(reinterpret_cast<GtkWidget *>(m_drag_row->gobj()), cr->cobj()); + m_drag_row->get_style_context()->remove_class("drag-icon"); + + int x, y; + widget->translate_coordinates(*m_drag_row, 0, 0, x, y); + surface->set_device_offset(-x, -y); + context->set_icon(surface); +} + +bool DragListBox::on_drag_motion(const Glib::RefPtr<Gdk::DragContext> &context, gint x, gint y, guint time) { + if (y > m_hover_top || y < m_hover_bottom) { + auto *row = get_row_at_y(y); + if (row == nullptr) return true; + const bool old_top = m_top; + const auto alloc = row->get_allocation(); + + const int hover_row_y = alloc.get_y(); + const int hover_row_height = alloc.get_height(); + if (row != m_drag_row) { + if (y < hover_row_y + hover_row_height / 2) { + m_hover_top = hover_row_y; + m_hover_bottom = m_hover_top + hover_row_height / 2; + row->get_style_context()->add_class("drag-hover-top"); + row->get_style_context()->remove_class("drag-hover-bottom"); + m_top = true; + } else { + m_hover_top = hover_row_y + hover_row_height / 2; + m_hover_bottom = hover_row_y + hover_row_height; + row->get_style_context()->add_class("drag-hover-bottom"); + row->get_style_context()->remove_class("drag-hover-top"); + m_top = false; + } + } + + if (m_hover_row != nullptr && m_hover_row != row) { + if (old_top) + m_hover_row->get_style_context()->remove_class("drag-hover-top"); + else + m_hover_row->get_style_context()->remove_class("drag-hover-bottom"); + } + + m_hover_row = row; + } + + check_scroll(y); + if (m_should_scroll && !m_scrolling) { + m_scrolling = true; + Glib::signal_timeout().connect(sigc::mem_fun(*this, &DragListBox::scroll), SCROLL_DELAY); + } + + return true; +} + +void DragListBox::on_drag_leave(const Glib::RefPtr<Gdk::DragContext> &context, guint time) { + m_should_scroll = false; +} + +void DragListBox::check_scroll(gint y) { + if (!get_focus_vadjustment()) + return; + + const double vadjustment_min = get_focus_vadjustment()->get_value(); + const double vadjustment_max = get_focus_vadjustment()->get_page_size() + vadjustment_min; + const double show_min = std::max(0, y - SCROLL_DISTANCE); + const double show_max = std::min(get_focus_vadjustment()->get_upper(), static_cast<double>(y) + SCROLL_DISTANCE); + if (vadjustment_min > show_min) { + m_should_scroll = true; + m_scroll_up = true; + } else if (vadjustment_max < show_max) { + m_should_scroll = true; + m_scroll_up = false; + } else { + m_should_scroll = false; + } +} + +bool DragListBox::scroll() { + if (m_should_scroll) { + if (m_scroll_up) { + get_focus_vadjustment()->set_value(get_focus_vadjustment()->get_value() - SCROLL_STEP_SIZE); + } else { + get_focus_vadjustment()->set_value(get_focus_vadjustment()->get_value() + SCROLL_STEP_SIZE); + } + } else { + m_scrolling = false; + } + return m_should_scroll; +} + +void DragListBox::on_drag_data_received(const Glib::RefPtr<Gdk::DragContext> &context, int x, int y, const Gtk::SelectionData &selection_data, guint info, guint time) { + int index = 0; + if (m_hover_row != nullptr) { + if (m_top) { + index = m_hover_row->get_index() - 1; + m_hover_row->get_style_context()->remove_class("drag-hover-top"); + } else { + index = m_hover_row->get_index(); + m_hover_row->get_style_context()->remove_class("drag-hover-bottom"); + } + + Gtk::Widget *handle = *reinterpret_cast<Gtk::Widget *const *>(selection_data.get_data()); + auto *row = dynamic_cast<Gtk::ListBoxRow *>(handle->get_ancestor(GTK_TYPE_LIST_BOX_ROW)); + + if (row != nullptr && row != m_hover_row) { + if (row->get_index() > index) + index += 1; + if (m_signal_on_drop.emit(row, index)) return; + row->get_parent()->remove(*row); + insert(*row, index); + } + } + + m_drag_row = nullptr; +} + +void DragListBox::add_draggable(Gtk::ListBoxRow *widget) { + widget->drag_source_set(m_entries, Gdk::BUTTON1_MASK, Gdk::ACTION_MOVE); + widget->signal_drag_begin().connect(sigc::bind<0>(sigc::mem_fun(*this, &DragListBox::row_drag_begin), widget)); + widget->signal_drag_data_get().connect([this, widget](const Glib::RefPtr<Gdk::DragContext> &context, Gtk::SelectionData &selection_data, guint info, guint time) { + selection_data.set("GTK_LIST_BOX_ROW", 32, reinterpret_cast<const guint8 *>(&widget), sizeof(&widget)); + }); + add(*widget); +} + +DragListBox::type_signal_on_drop DragListBox::signal_on_drop() { + return m_signal_on_drop; +} |