85 lines
1.9 KiB
C++
85 lines
1.9 KiB
C++
// This file is part of Desktop App Toolkit,
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// a set of libraries for developing nice desktop applications.
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//
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// For license and copyright information please follow this link:
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// https://github.com/desktop-app/legal/blob/master/LEGAL
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//
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#pragma once
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#include "ui/effects/animations.h"
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#include "ui/widgets/scroll_area.h"
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namespace Ui {
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class RpWidget;
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class VerticalLayout;
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class VerticalLayoutReorder final {
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public:
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enum class State : uchar {
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Started,
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Applied,
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Cancelled,
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};
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struct Single {
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not_null<RpWidget*> widget;
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int oldPosition = 0;
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int newPosition = 0;
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State state = State::Started;
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};
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VerticalLayoutReorder(
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not_null<VerticalLayout*> layout,
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not_null<ScrollArea*> scroll);
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void start();
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void cancel();
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void finishReordering();
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[[nodiscard]] rpl::producer<Single> updates() const;
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private:
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struct Entry {
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not_null<RpWidget*> widget;
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Ui::Animations::Simple shiftAnimation;
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int shift = 0;
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int finalShift = 0;
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int deltaShift = 0;
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};
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void mouseMove(not_null<RpWidget*> widget, QPoint position);
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void mousePress(
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not_null<RpWidget*> widget,
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Qt::MouseButton button,
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QPoint position);
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void mouseRelease(Qt::MouseButton button);
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void checkForStart(QPoint position);
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void updateOrder(int index, QPoint position);
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void cancelCurrent();
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void finishCurrent();
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void cancelCurrent(int index);
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[[nodiscard]] int indexOf(not_null<RpWidget*> widget) const;
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void moveToShift(int index, int shift);
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void updateShift(not_null<RpWidget*> widget, int indexHint);
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void updateScrollCallback();
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void checkForScrollAnimation();
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int deltaFromEdge();
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const not_null<Ui::VerticalLayout*> _layout;
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const not_null<Ui::ScrollArea*> _scroll;
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Ui::Animations::Basic _scrollAnimation;
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RpWidget *_currentWidget = nullptr;
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int _currentStart = 0;
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int _currentDesiredIndex = 0;
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State _currentState = State::Cancelled;
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std::vector<Entry> _entries;
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rpl::event_stream<Single> _updates;
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rpl::lifetime _lifetime;
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};
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} // namespace Ui
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