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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.
78 lines
2.9 KiB
C++
78 lines
2.9 KiB
C++
/*
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* Copyright (c) 2020, 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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#pragma once
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#include <AK/Forward.h>
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#include <AK/NonnullOwnPtr.h>
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#include <AK/WeakPtr.h>
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#include <LibGfx/Forward.h>
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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/Page/InputEvent.h>
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#include <LibWeb/PixelUnits.h>
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#include <LibWeb/UIEvents/KeyCode.h>
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namespace Web {
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class EventHandler {
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public:
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explicit EventHandler(Badge<HTML::Navigable>, HTML::Navigable&);
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~EventHandler();
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bool handle_mouseup(CSSPixelPoint, CSSPixelPoint screen_position, unsigned button, unsigned buttons, unsigned modifiers);
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bool handle_mousedown(CSSPixelPoint, CSSPixelPoint screen_position, unsigned button, unsigned buttons, unsigned modifiers);
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bool handle_mousemove(CSSPixelPoint, CSSPixelPoint screen_position, unsigned buttons, unsigned modifiers);
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bool handle_mousewheel(CSSPixelPoint, CSSPixelPoint screen_position, unsigned button, unsigned buttons, unsigned modifiers, int wheel_delta_x, int wheel_delta_y);
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bool handle_doubleclick(CSSPixelPoint, CSSPixelPoint screen_position, unsigned button, unsigned buttons, unsigned modifiers);
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bool handle_drag_and_drop_event(DragEvent::Type, CSSPixelPoint, CSSPixelPoint screen_position, unsigned button, unsigned buttons, unsigned modifiers, Vector<HTML::SelectedFile> files);
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bool handle_keydown(UIEvents::KeyCode, unsigned modifiers, u32 code_point);
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bool handle_keyup(UIEvents::KeyCode, unsigned modifiers, u32 code_point);
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void set_mouse_event_tracking_paintable(Painting::Paintable*);
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void handle_paste(String const& text);
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void visit_edges(JS::Cell::Visitor& visitor) const;
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private:
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bool focus_next_element();
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bool focus_previous_element();
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bool fire_keyboard_event(FlyString const& event_name, HTML::Navigable&, UIEvents::KeyCode, unsigned modifiers, u32 code_point);
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CSSPixelPoint compute_mouse_event_client_offset(CSSPixelPoint event_page_position) const;
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CSSPixelPoint compute_mouse_event_page_offset(CSSPixelPoint event_client_offset) const;
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CSSPixelPoint compute_mouse_event_movement(CSSPixelPoint event_client_offset) const;
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struct Target {
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JS::GCPtr<Painting::Paintable> paintable;
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Optional<int> index_in_node;
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};
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Optional<Target> target_for_mouse_position(CSSPixelPoint position);
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Painting::PaintableBox* paint_root();
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Painting::PaintableBox const* paint_root() const;
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bool should_ignore_device_input_event() const;
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JS::NonnullGCPtr<HTML::Navigable> m_navigable;
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bool m_in_mouse_selection { false };
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JS::GCPtr<Painting::Paintable> m_mouse_event_tracking_paintable;
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NonnullOwnPtr<EditEventHandler> m_edit_event_handler;
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NonnullOwnPtr<DragAndDropEventHandler> m_drag_and_drop_event_handler;
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WeakPtr<DOM::EventTarget> m_mousedown_target;
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Optional<CSSPixelPoint> m_mousemove_previous_screen_position;
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};
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}
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