mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2024-09-20 09:49:15 +03:00
a0ef00cab2
With a new DragCopy cursor icon being used on accepted events, this caused a 'false assumption' that everything can be dropped into AbstractView. This will now only happen if the View is editable, which still isn't perfect, but at least the Settings app will no longer change cursors. Also note that we won't get "drag move" events as the comment below says, which disables automatic scrolling when dragging an element.
830 lines
25 KiB
C++
830 lines
25 KiB
C++
/*
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* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/Debug.h>
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#include <AK/StringBuilder.h>
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#include <AK/Utf8View.h>
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#include <LibCore/Object.h>
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#include <LibCore/Timer.h>
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#include <LibGUI/AbstractView.h>
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#include <LibGUI/DragOperation.h>
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#include <LibGUI/Model.h>
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#include <LibGUI/ModelEditingDelegate.h>
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#include <LibGUI/Painter.h>
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#include <LibGUI/Scrollbar.h>
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#include <LibGUI/TextBox.h>
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#include <LibGfx/Palette.h>
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namespace GUI {
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AbstractView::AbstractView()
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: m_sort_order(SortOrder::Ascending)
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, m_selection(*this)
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{
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REGISTER_BOOL_PROPERTY("activates_on_selection", activates_on_selection, set_activates_on_selection);
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REGISTER_BOOL_PROPERTY("editable", is_editable, set_editable);
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REGISTER_BOOL_PROPERTY("searchable", is_searchable, set_searchable);
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REGISTER_ENUM_PROPERTY("selection_behavior", selection_behavior, set_selection_behavior, SelectionBehavior,
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{ SelectionBehavior::SelectItems, "SelectItems" },
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{ SelectionBehavior::SelectRows, "SelectRows" });
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REGISTER_ENUM_PROPERTY("selection_mode", selection_mode, set_selection_mode, SelectionMode,
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{ SelectionMode::SingleSelection, "SingleSelection" },
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{ SelectionMode::MultiSelection, "MultiSeleciton" },
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{ SelectionMode::NoSelection, "NoSelection" });
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REGISTER_INT_PROPERTY("key_column", key_column, set_key_column);
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REGISTER_ENUM_PROPERTY("sort_order", sort_order, set_sort_order, SortOrder,
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{ SortOrder::Ascending, "Ascending" },
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{ SortOrder::Descending, "Descending" });
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REGISTER_BOOL_PROPERTY("tab_key_navigation_enabled", is_tab_key_navigation_enabled, set_tab_key_navigation_enabled);
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REGISTER_BOOL_PROPERTY("draw_item_text_with_shadow", does_draw_item_text_with_shadow, set_draw_item_text_with_shadow);
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set_focus_policy(GUI::FocusPolicy::StrongFocus);
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}
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AbstractView::~AbstractView()
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{
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if (m_highlighted_search_timer)
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m_highlighted_search_timer->stop();
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if (m_model)
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m_model->unregister_view({}, *this);
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}
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void AbstractView::set_model(RefPtr<Model> model)
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{
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if (model == m_model)
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return;
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if (m_model)
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m_model->unregister_view({}, *this);
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m_model = move(model);
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if (m_model)
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m_model->register_view({}, *this);
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model_did_update(GUI::Model::InvalidateAllIndices);
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scroll_to_top();
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}
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void AbstractView::model_did_update(unsigned int flags)
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{
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if (!model() || (flags & GUI::Model::InvalidateAllIndices)) {
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stop_editing();
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m_edit_index = {};
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m_hovered_index = {};
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m_cursor_index = {};
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m_drop_candidate_index = {};
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clear_selection();
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} else {
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// FIXME: These may no longer point to whatever they did before,
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// but let's be optimistic until we can be sure about it.
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if (!model()->is_within_range(m_edit_index)) {
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stop_editing();
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m_edit_index = {};
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}
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if (!model()->is_within_range(m_hovered_index))
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m_hovered_index = {};
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if (!model()->is_within_range(m_cursor_index))
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m_cursor_index = {};
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if (!model()->is_within_range(m_drop_candidate_index))
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m_drop_candidate_index = {};
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selection().remove_all_matching([this](auto& index) { return !model()->is_within_range(index); });
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auto index = find_next_search_match(m_highlighted_search.view());
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if (index.is_valid())
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highlight_search(index);
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}
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m_selection_start_index = {};
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}
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void AbstractView::clear_selection()
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{
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m_selection.clear();
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}
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void AbstractView::set_selection(ModelIndex const& new_index)
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{
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m_selection.set(new_index);
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}
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void AbstractView::set_selection_start_index(ModelIndex const& new_index)
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{
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m_selection_start_index = new_index;
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}
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void AbstractView::add_selection(ModelIndex const& new_index)
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{
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m_selection.add(new_index);
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}
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void AbstractView::remove_selection(ModelIndex const& new_index)
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{
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m_selection.remove(new_index);
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}
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void AbstractView::toggle_selection(ModelIndex const& new_index)
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{
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m_selection.toggle(new_index);
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}
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void AbstractView::did_update_selection()
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{
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if (!model() || selection().first() != m_edit_index)
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stop_editing();
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if (model() && on_selection_change)
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on_selection_change();
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}
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void AbstractView::did_scroll()
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{
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update_edit_widget_position();
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}
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void AbstractView::update_edit_widget_position()
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{
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if (!m_edit_widget)
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return;
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m_edit_widget->set_relative_rect(m_edit_widget_content_rect.translated(-horizontal_scrollbar().value(), -vertical_scrollbar().value()));
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}
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void AbstractView::begin_editing(ModelIndex const& index)
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{
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VERIFY(is_editable());
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VERIFY(model());
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if (m_edit_index == index)
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return;
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if (!model()->is_editable(index))
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return;
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if (m_edit_widget) {
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remove_child(*m_edit_widget);
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m_edit_widget = nullptr;
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}
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m_edit_index = index;
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VERIFY(aid_create_editing_delegate);
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m_editing_delegate = aid_create_editing_delegate(index);
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m_editing_delegate->bind(*model(), index);
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m_editing_delegate->set_value(index.data());
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m_edit_widget = m_editing_delegate->widget();
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add_child(*m_edit_widget);
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m_edit_widget->move_to_back();
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m_edit_widget_content_rect = editing_rect(index).translated(frame_thickness(), frame_thickness());
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update_edit_widget_position();
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m_edit_widget->set_focus(true);
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m_editing_delegate->will_begin_editing();
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m_editing_delegate->on_commit = [this] {
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VERIFY(model());
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model()->set_data(m_edit_index, m_editing_delegate->value());
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stop_editing();
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};
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m_editing_delegate->on_rollback = [this] {
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VERIFY(model());
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stop_editing();
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};
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m_editing_delegate->on_change = [this, index] {
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editing_widget_did_change(index);
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};
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}
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void AbstractView::stop_editing()
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{
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bool take_back_focus = false;
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m_edit_index = {};
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if (m_edit_widget) {
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take_back_focus = m_edit_widget->is_focused();
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remove_child(*m_edit_widget);
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m_edit_widget = nullptr;
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}
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if (take_back_focus)
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set_focus(true);
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}
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void AbstractView::activate(ModelIndex const& index)
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{
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if (on_activation)
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on_activation(index);
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}
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void AbstractView::activate_selected()
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{
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if (!on_activation)
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return;
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selection().for_each_index([this](auto& index) {
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on_activation(index);
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});
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}
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void AbstractView::notify_selection_changed(Badge<ModelSelection>)
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{
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did_update_selection();
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if (!m_suppress_update_on_selection_change)
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update();
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}
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NonnullRefPtr<Gfx::Font> AbstractView::font_for_index(ModelIndex const& index) const
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{
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if (!model())
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return font();
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auto font_data = index.data(ModelRole::Font);
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if (font_data.is_font())
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return font_data.as_font();
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return font();
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}
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void AbstractView::mousedown_event(MouseEvent& event)
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{
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AbstractScrollableWidget::mousedown_event(event);
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if (!model())
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return;
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if (event.button() == MouseButton::Primary)
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m_left_mousedown_position = event.position();
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auto index = index_at_event_position(event.position());
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m_might_drag = false;
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if (!index.is_valid()) {
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clear_selection();
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} else if (event.modifiers() & Mod_Ctrl) {
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set_cursor(index, SelectionUpdate::Ctrl);
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} else if (event.modifiers() & Mod_Shift) {
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set_cursor(index, SelectionUpdate::Shift);
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} else if (event.button() == MouseButton::Primary && m_selection.contains(index) && !m_model->drag_data_type().is_null()) {
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// We might be starting a drag, so don't throw away other selected items yet.
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m_might_drag = true;
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} else if (event.button() == MouseButton::Secondary) {
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set_cursor(index, SelectionUpdate::ClearIfNotSelected);
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} else {
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set_cursor(index, SelectionUpdate::Set);
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m_might_drag = true;
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}
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update();
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}
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void AbstractView::set_hovered_index(ModelIndex const& index)
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{
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if (m_hovered_index == index)
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return;
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auto old_index = m_hovered_index;
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m_hovered_index = index;
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did_change_hovered_index(old_index, index);
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if (old_index.is_valid())
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update(to_widget_rect(paint_invalidation_rect(old_index)));
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if (index.is_valid())
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update(to_widget_rect(paint_invalidation_rect(index)));
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}
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void AbstractView::leave_event(Core::Event& event)
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{
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AbstractScrollableWidget::leave_event(event);
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set_hovered_index({});
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}
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void AbstractView::mousemove_event(MouseEvent& event)
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{
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if (!model())
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return AbstractScrollableWidget::mousemove_event(event);
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auto hovered_index = index_at_event_position(event.position());
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set_hovered_index(hovered_index);
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auto data_type = m_model->drag_data_type();
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if (data_type.is_null())
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return AbstractScrollableWidget::mousemove_event(event);
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if (!m_might_drag)
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return AbstractScrollableWidget::mousemove_event(event);
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if (!(event.buttons() & MouseButton::Primary) || m_selection.is_empty()) {
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m_might_drag = false;
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return AbstractScrollableWidget::mousemove_event(event);
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}
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auto diff = event.position() - m_left_mousedown_position;
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auto distance_travelled_squared = diff.x() * diff.x() + diff.y() * diff.y();
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constexpr int drag_distance_threshold = 5;
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if (distance_travelled_squared <= drag_distance_threshold)
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return AbstractScrollableWidget::mousemove_event(event);
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VERIFY(!data_type.is_null());
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if (m_is_dragging)
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return;
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// An event might sneak in between us constructing the drag operation and the
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// event loop exec at the end of `drag_operation->exec()' if the user is fast enough.
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// Prevent this by just ignoring later drag initiations (until the current drag operation ends).
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TemporaryChange dragging { m_is_dragging, true };
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dbgln_if(DRAG_DEBUG, "Initiate drag!");
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auto drag_operation = DragOperation::construct();
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drag_operation->set_mime_data(m_model->mime_data(m_selection));
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auto outcome = drag_operation->exec();
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switch (outcome) {
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case DragOperation::Outcome::Accepted:
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dbgln_if(DRAG_DEBUG, "Drag was accepted!");
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break;
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case DragOperation::Outcome::Cancelled:
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dbgln_if(DRAG_DEBUG, "Drag was cancelled!");
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m_might_drag = false;
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break;
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default:
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VERIFY_NOT_REACHED();
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break;
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}
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}
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void AbstractView::mouseup_event(MouseEvent& event)
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{
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AbstractScrollableWidget::mouseup_event(event);
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if (!model())
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return;
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set_automatic_scrolling_timer(false);
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if (m_might_drag) {
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// We were unsure about unselecting items other than the current one
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// in mousedown_event(), because we could be seeing a start of a drag.
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// Since we're here, it was not that; so fix up the selection now.
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auto index = index_at_event_position(event.position());
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if (index.is_valid()) {
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set_cursor(index, SelectionUpdate::Set, true);
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} else
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clear_selection();
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m_might_drag = false;
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update();
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}
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if (activates_on_selection())
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activate_selected();
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}
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void AbstractView::doubleclick_event(MouseEvent& event)
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{
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if (!model())
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return;
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if (event.button() != MouseButton::Primary)
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return;
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m_might_drag = false;
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auto index = index_at_event_position(event.position());
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if (!index.is_valid()) {
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clear_selection();
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return;
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}
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if (!m_selection.contains(index))
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set_selection(index);
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if (is_editable() && edit_triggers() & EditTrigger::DoubleClicked)
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begin_editing(cursor_index());
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else
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activate(cursor_index());
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}
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void AbstractView::context_menu_event(ContextMenuEvent& event)
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{
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if (!model())
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return;
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auto index = index_at_event_position(event.position());
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if (index.is_valid())
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add_selection(index);
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else
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clear_selection();
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if (on_context_menu_request)
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on_context_menu_request(index, event);
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}
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void AbstractView::drop_event(DropEvent& event)
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{
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event.accept();
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if (!model())
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return;
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auto index = index_at_event_position(event.position());
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if (on_drop)
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on_drop(index, event);
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}
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void AbstractView::set_selection_mode(SelectionMode selection_mode)
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{
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if (m_selection_mode == selection_mode)
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return;
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m_selection_mode = selection_mode;
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if (m_selection_mode == SelectionMode::NoSelection)
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m_selection.clear();
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else if (m_selection_mode != SelectionMode::SingleSelection && m_selection.size() > 1) {
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auto first_selected = m_selection.first();
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m_selection.clear();
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m_selection.set(first_selected);
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}
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update();
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}
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void AbstractView::set_key_column_and_sort_order(int column, SortOrder sort_order)
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{
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m_key_column = column;
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m_sort_order = sort_order;
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if (model())
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model()->sort(column, sort_order);
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update();
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}
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void AbstractView::select_range(ModelIndex const& index)
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{
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auto min_row = min(selection_start_index().row(), index.row());
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auto max_row = max(selection_start_index().row(), index.row());
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auto min_column = min(selection_start_index().column(), index.column());
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auto max_column = max(selection_start_index().column(), index.column());
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clear_selection();
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for (auto row = min_row; row <= max_row; ++row) {
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for (auto column = min_column; column <= max_column; ++column) {
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auto new_index = model()->index(row, column);
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if (new_index.is_valid())
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toggle_selection(new_index);
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}
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}
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}
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void AbstractView::set_cursor(ModelIndex index, SelectionUpdate selection_update, bool scroll_cursor_into_view)
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{
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if (!model() || !index.is_valid() || selection_mode() == SelectionMode::NoSelection) {
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m_cursor_index = {};
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stop_highlighted_search_timer();
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return;
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}
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if (!m_cursor_index.is_valid() || model()->parent_index(m_cursor_index) != model()->parent_index(index))
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stop_highlighted_search_timer();
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if (selection_mode() == SelectionMode::SingleSelection && (selection_update == SelectionUpdate::Ctrl || selection_update == SelectionUpdate::Shift))
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selection_update = SelectionUpdate::Set;
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if (model()->is_within_range(index)) {
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if (selection_update == SelectionUpdate::Set) {
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set_selection(index);
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set_selection_start_index(index);
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} else if (selection_update == SelectionUpdate::Ctrl) {
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toggle_selection(index);
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} else if (selection_update == SelectionUpdate::ClearIfNotSelected) {
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if (!m_selection.contains(index))
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clear_selection();
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} else if (selection_update == SelectionUpdate::Shift) {
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select_range(index);
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}
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// FIXME: Support the other SelectionUpdate types
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auto old_cursor_index = m_cursor_index;
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m_cursor_index = index;
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did_change_cursor_index(old_cursor_index, m_cursor_index);
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if (scroll_cursor_into_view)
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scroll_into_view(index, true, true);
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update();
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}
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}
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void AbstractView::set_edit_triggers(unsigned triggers)
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{
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m_edit_triggers = triggers;
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}
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void AbstractView::hide_event(HideEvent& event)
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{
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stop_editing();
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AbstractScrollableWidget::hide_event(event);
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}
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void AbstractView::keydown_event(KeyEvent& event)
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{
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if (event.alt()) {
|
|
event.ignore();
|
|
return;
|
|
}
|
|
|
|
if (event.key() == KeyCode::Key_F2) {
|
|
if (is_editable() && edit_triggers() & EditTrigger::EditKeyPressed) {
|
|
begin_editing(cursor_index());
|
|
event.accept();
|
|
return;
|
|
}
|
|
}
|
|
|
|
if (event.key() == KeyCode::Key_Return) {
|
|
activate_selected();
|
|
event.accept();
|
|
return;
|
|
}
|
|
|
|
SelectionUpdate selection_update = SelectionUpdate::Set;
|
|
if (event.modifiers() == KeyModifier::Mod_Shift) {
|
|
selection_update = SelectionUpdate::Shift;
|
|
}
|
|
|
|
if (event.key() == KeyCode::Key_Left) {
|
|
move_cursor(CursorMovement::Left, selection_update);
|
|
event.accept();
|
|
return;
|
|
}
|
|
if (event.key() == KeyCode::Key_Right) {
|
|
move_cursor(CursorMovement::Right, selection_update);
|
|
event.accept();
|
|
return;
|
|
}
|
|
if (event.key() == KeyCode::Key_Up) {
|
|
move_cursor(CursorMovement::Up, selection_update);
|
|
event.accept();
|
|
return;
|
|
}
|
|
if (event.key() == KeyCode::Key_Down) {
|
|
move_cursor(CursorMovement::Down, selection_update);
|
|
event.accept();
|
|
return;
|
|
}
|
|
if (event.key() == KeyCode::Key_Home) {
|
|
move_cursor(CursorMovement::Home, selection_update);
|
|
event.accept();
|
|
return;
|
|
}
|
|
if (event.key() == KeyCode::Key_End) {
|
|
move_cursor(CursorMovement::End, selection_update);
|
|
event.accept();
|
|
return;
|
|
}
|
|
if (event.key() == KeyCode::Key_PageUp) {
|
|
move_cursor(CursorMovement::PageUp, selection_update);
|
|
event.accept();
|
|
return;
|
|
}
|
|
if (event.key() == KeyCode::Key_PageDown) {
|
|
move_cursor(CursorMovement::PageDown, selection_update);
|
|
event.accept();
|
|
return;
|
|
}
|
|
|
|
if (is_searchable()) {
|
|
if (event.key() == KeyCode::Key_Backspace) {
|
|
if (!m_highlighted_search.is_null()) {
|
|
// if (event.modifiers() == Mod_Ctrl) {
|
|
// TODO: delete last word
|
|
// }
|
|
Utf8View view(m_highlighted_search);
|
|
size_t n_code_points = view.length();
|
|
if (n_code_points > 1) {
|
|
n_code_points--;
|
|
StringBuilder sb;
|
|
for (auto it = view.begin(); it != view.end(); ++it) {
|
|
if (n_code_points == 0)
|
|
break;
|
|
n_code_points--;
|
|
sb.append_code_point(*it);
|
|
}
|
|
auto index = find_next_search_match(sb.string_view());
|
|
if (index.is_valid()) {
|
|
m_highlighted_search = sb.to_string();
|
|
highlight_search(index);
|
|
start_highlighted_search_timer();
|
|
}
|
|
} else {
|
|
stop_highlighted_search_timer();
|
|
}
|
|
|
|
event.accept();
|
|
return;
|
|
}
|
|
} else if (event.key() == KeyCode::Key_Escape) {
|
|
if (!m_highlighted_search.is_null()) {
|
|
stop_highlighted_search_timer();
|
|
|
|
event.accept();
|
|
return;
|
|
}
|
|
} else if (event.key() != KeyCode::Key_Tab && !event.ctrl() && !event.alt() && event.code_point() != 0) {
|
|
StringBuilder sb;
|
|
sb.append(m_highlighted_search);
|
|
sb.append_code_point(event.code_point());
|
|
|
|
auto index = find_next_search_match(sb.string_view());
|
|
if (index.is_valid()) {
|
|
m_highlighted_search = sb.to_string();
|
|
highlight_search(index);
|
|
start_highlighted_search_timer();
|
|
set_cursor(index, SelectionUpdate::None, true);
|
|
}
|
|
|
|
event.accept();
|
|
return;
|
|
}
|
|
}
|
|
|
|
AbstractScrollableWidget::keydown_event(event);
|
|
}
|
|
|
|
void AbstractView::stop_highlighted_search_timer()
|
|
{
|
|
m_highlighted_search = nullptr;
|
|
if (m_highlighted_search_timer)
|
|
m_highlighted_search_timer->stop();
|
|
if (m_highlighted_search_index.is_valid()) {
|
|
m_highlighted_search_index = {};
|
|
update();
|
|
}
|
|
}
|
|
|
|
void AbstractView::start_highlighted_search_timer()
|
|
{
|
|
if (!m_highlighted_search_timer) {
|
|
m_highlighted_search_timer = add<Core::Timer>();
|
|
m_highlighted_search_timer->set_single_shot(true);
|
|
m_highlighted_search_timer->on_timeout = [this] {
|
|
stop_highlighted_search_timer();
|
|
};
|
|
}
|
|
m_highlighted_search_timer->set_interval(5 * 1000);
|
|
m_highlighted_search_timer->restart();
|
|
}
|
|
|
|
ModelIndex AbstractView::find_next_search_match(StringView const search)
|
|
{
|
|
if (search.is_empty())
|
|
return {};
|
|
|
|
auto found_indices = model()->matches(search, Model::MatchesFlag::FirstMatchOnly | Model::MatchesFlag::MatchAtStart | Model::MatchesFlag::CaseInsensitive, model()->parent_index(cursor_index()));
|
|
|
|
if (found_indices.is_empty())
|
|
return {};
|
|
|
|
return found_indices[0];
|
|
}
|
|
|
|
void AbstractView::highlight_search(ModelIndex const index)
|
|
{
|
|
m_highlighted_search_index = index;
|
|
set_selection(index);
|
|
scroll_into_view(index);
|
|
update();
|
|
}
|
|
|
|
bool AbstractView::is_searchable() const
|
|
{
|
|
if (!m_searchable || !model())
|
|
return false;
|
|
return model()->is_searchable();
|
|
}
|
|
|
|
void AbstractView::set_searchable(bool searchable)
|
|
{
|
|
if (m_searchable == searchable)
|
|
return;
|
|
m_searchable = searchable;
|
|
if (!m_searchable)
|
|
stop_highlighted_search_timer();
|
|
}
|
|
|
|
void AbstractView::draw_item_text(Gfx::Painter& painter, ModelIndex const& index, bool is_selected, Gfx::IntRect const& text_rect, StringView item_text, Gfx::Font const& font, Gfx::TextAlignment alignment, Gfx::TextElision elision, size_t search_highlighting_offset)
|
|
{
|
|
if (m_edit_index == index)
|
|
return;
|
|
|
|
Color text_color;
|
|
if (is_selected)
|
|
text_color = is_focused() ? palette().selection_text() : palette().inactive_selection_text();
|
|
else
|
|
text_color = index.data(ModelRole::ForegroundColor).to_color(palette().color(foreground_role()));
|
|
if (index == m_highlighted_search_index) {
|
|
Utf8View searching_text(m_highlighted_search);
|
|
auto searching_length = searching_text.length();
|
|
if (searching_length > search_highlighting_offset)
|
|
searching_length -= search_highlighting_offset;
|
|
else if (search_highlighting_offset > 0)
|
|
searching_length = 0;
|
|
|
|
// Highlight the text background first
|
|
auto background_searching_length = searching_length;
|
|
painter.draw_text([&](Gfx::IntRect const& rect, Utf8CodePointIterator&) {
|
|
if (background_searching_length > 0) {
|
|
background_searching_length--;
|
|
painter.fill_rect(rect.inflated(0, 2), palette().highlight_searching());
|
|
}
|
|
},
|
|
text_rect, item_text, font, alignment, elision);
|
|
|
|
// Then draw the text
|
|
auto text_searching_length = searching_length;
|
|
auto highlight_text_color = palette().highlight_searching_text();
|
|
searching_length = searching_text.length();
|
|
painter.draw_text([&](Gfx::IntRect const& rect, Utf8CodePointIterator& it) {
|
|
if (text_searching_length > 0) {
|
|
text_searching_length--;
|
|
painter.draw_glyph_or_emoji(rect.location(), it, font, highlight_text_color);
|
|
} else {
|
|
painter.draw_glyph_or_emoji(rect.location(), it, font, text_color);
|
|
}
|
|
},
|
|
text_rect, item_text, font, alignment, elision);
|
|
} else {
|
|
if (m_draw_item_text_with_shadow) {
|
|
painter.draw_text(text_rect.translated(1, 1), item_text, font, alignment, Color::Black, elision);
|
|
painter.draw_text(text_rect, item_text, font, alignment, Color::White, elision);
|
|
} else {
|
|
painter.draw_text(text_rect, item_text, font, alignment, text_color, elision);
|
|
}
|
|
}
|
|
}
|
|
|
|
void AbstractView::focusin_event(FocusEvent& event)
|
|
{
|
|
AbstractScrollableWidget::focusin_event(event);
|
|
|
|
if (model() && !cursor_index().is_valid()) {
|
|
move_cursor(CursorMovement::Home, SelectionUpdate::None);
|
|
clear_selection();
|
|
}
|
|
}
|
|
|
|
void AbstractView::drag_enter_event(DragEvent& event)
|
|
{
|
|
if (!model())
|
|
return;
|
|
|
|
if (!is_editable())
|
|
return;
|
|
|
|
// NOTE: Right now, AbstractView accepts drags since we won't get "drag move" events
|
|
// unless we accept the "drag enter" event.
|
|
// We might be able to reduce event traffic by communicating the set of drag-accepting
|
|
// rects in this widget to the windowing system somehow.
|
|
event.accept();
|
|
dbgln_if(DRAG_DEBUG, "accepting drag of {}", event.mime_types().first());
|
|
}
|
|
|
|
void AbstractView::drag_move_event(DragEvent& event)
|
|
{
|
|
if (!model())
|
|
return;
|
|
|
|
auto index = index_at_event_position(event.position());
|
|
ModelIndex new_drop_candidate_index;
|
|
bool acceptable = model()->accepts_drag(index, event.mime_types());
|
|
|
|
if (acceptable && index.is_valid())
|
|
new_drop_candidate_index = index;
|
|
|
|
if (acceptable) {
|
|
m_automatic_scroll_delta = automatic_scroll_delta_from_position(event.position());
|
|
set_automatic_scrolling_timer(!m_automatic_scroll_delta.is_null());
|
|
}
|
|
|
|
if (m_drop_candidate_index != new_drop_candidate_index) {
|
|
m_drop_candidate_index = new_drop_candidate_index;
|
|
update();
|
|
}
|
|
if (m_drop_candidate_index.is_valid())
|
|
event.accept();
|
|
}
|
|
|
|
void AbstractView::drag_leave_event(Event&)
|
|
{
|
|
if (m_drop_candidate_index.is_valid()) {
|
|
m_drop_candidate_index = {};
|
|
update();
|
|
}
|
|
|
|
set_automatic_scrolling_timer(false);
|
|
}
|
|
|
|
void AbstractView::on_automatic_scrolling_timer_fired()
|
|
{
|
|
if (m_automatic_scroll_delta.is_null())
|
|
return;
|
|
|
|
vertical_scrollbar().increase_slider_by(m_automatic_scroll_delta.y());
|
|
horizontal_scrollbar().increase_slider_by(m_automatic_scroll_delta.x());
|
|
}
|
|
|
|
}
|