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f7c4165dde
Ownership of the drag data store is a bit weird. In a normal drag-and- drop operation, the DragAndDropEventHandler owns the store. When events are fired for the operation, the DataTransfer object assigned to those events are "associated" with the store. We currently represent that with an Optional<DragDataStore&>. However, it's also possible to create DataTransfer objects from scripts. Those objects create their own drag data store. This puts DataTransfer in a weird situation where it may own a store or just reference one. Rather than coming up with something like Variant<DDS, DDS&> or using MaybeOwned<DDS> here, we can get by with just making the store reference counted.
67 lines
2.7 KiB
C++
67 lines
2.7 KiB
C++
/*
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* Copyright (c) 2024, Tim Flynn <trflynn89@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <LibJS/Heap/Cell.h>
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#include <LibJS/Heap/GCPtr.h>
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#include <LibWeb/Forward.h>
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#include <LibWeb/HTML/DragDataStore.h>
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#include <LibWeb/PixelUnits.h>
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namespace Web {
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class DragAndDropEventHandler {
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public:
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void visit_edges(JS::Cell::Visitor& visitor) const;
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bool has_ongoing_drag_and_drop_operation() const { return !m_drag_data_store.is_null(); }
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bool handle_drag_start(JS::Realm&, CSSPixelPoint screen_position, CSSPixelPoint page_offset, CSSPixelPoint client_offset, CSSPixelPoint offset, unsigned button, unsigned buttons, unsigned modifiers, Vector<HTML::SelectedFile> files);
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bool handle_drag_move(JS::Realm&, JS::NonnullGCPtr<DOM::Document>, JS::NonnullGCPtr<DOM::Node>, CSSPixelPoint screen_position, CSSPixelPoint page_offset, CSSPixelPoint client_offset, CSSPixelPoint offset, unsigned button, unsigned buttons, unsigned modifiers);
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bool handle_drag_leave(JS::Realm&, CSSPixelPoint screen_position, CSSPixelPoint page_offset, CSSPixelPoint client_offset, CSSPixelPoint offset, unsigned button, unsigned buttons, unsigned modifiers);
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bool handle_drop(JS::Realm&, CSSPixelPoint screen_position, CSSPixelPoint page_offset, CSSPixelPoint client_offset, CSSPixelPoint offset, unsigned button, unsigned buttons, unsigned modifiers);
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private:
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enum class Cancelled {
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No,
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Yes,
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};
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bool handle_drag_end(JS::Realm&, Cancelled, CSSPixelPoint screen_position, CSSPixelPoint page_offset, CSSPixelPoint client_offset, CSSPixelPoint offset, unsigned button, unsigned buttons, unsigned modifiers);
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JS::NonnullGCPtr<HTML::DragEvent> fire_a_drag_and_drop_event(
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JS::Realm&,
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JS::GCPtr<DOM::EventTarget> target,
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FlyString const& name,
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CSSPixelPoint screen_position,
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CSSPixelPoint page_offset,
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CSSPixelPoint client_offset,
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CSSPixelPoint offset,
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unsigned button,
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unsigned buttons,
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unsigned modifiers,
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JS::GCPtr<DOM::EventTarget> related_target = nullptr);
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bool allow_text_drop(JS::NonnullGCPtr<DOM::Node>) const;
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void reset();
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RefPtr<HTML::DragDataStore> m_drag_data_store;
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// https://html.spec.whatwg.org/multipage/dnd.html#source-node
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JS::GCPtr<DOM::EventTarget> m_source_node;
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// https://html.spec.whatwg.org/multipage/dnd.html#immediate-user-selection
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JS::GCPtr<DOM::Node> m_immediate_user_selection;
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// https://html.spec.whatwg.org/multipage/dnd.html#current-target-element
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JS::GCPtr<DOM::Node> m_current_target_element;
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// https://html.spec.whatwg.org/multipage/dnd.html#current-drag-operation
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FlyString m_current_drag_operation;
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};
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}
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