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The drag-and-drop processing model allows for users to drag around either elements within the DOM or objects completely outside the DOM. This drag event can either end without action (via cancellation or user input), or in a drop event, where the dragged object is dropped onto another element within the DOM. The processing model is rather large. This implements enough of it to allow the UI process to specifically handle dragging objects outside of the DOM onto the DOM. For example, dragging an image from the OS file manager onto a file-upload input element. This does not implement the ability to drag DOM elements.
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.has_value(); }
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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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Optional<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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