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https://github.com/fergalmoran/ladybird.git
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541968b30d
UI event handlers currently return a boolean where false means the event was cancelled by a script on the page, or otherwise dropped. It has been a point of confusion for some time now, as it's not particularly clear what should be returned in some special cases, or how the UI process should handle the response. This adds an enumeration with a few states that indicate exactly how the WebContent process handled the event. This should remove all ambiguity, and let us properly handle these states going forward. There should be no behavior change with this patch. It's meant to only introduce the enum, not change any of our decisions based on the result.
86 lines
3.2 KiB
C++
86 lines
3.2 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 <LibUnicode/Forward.h>
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#include <LibWeb/Forward.h>
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#include <LibWeb/Page/EventResult.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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EventResult handle_mouseup(CSSPixelPoint, CSSPixelPoint screen_position, unsigned button, unsigned buttons, unsigned modifiers);
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EventResult handle_mousedown(CSSPixelPoint, CSSPixelPoint screen_position, unsigned button, unsigned buttons, unsigned modifiers);
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EventResult handle_mousemove(CSSPixelPoint, CSSPixelPoint screen_position, unsigned buttons, unsigned modifiers);
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EventResult handle_mousewheel(CSSPixelPoint, CSSPixelPoint screen_position, unsigned button, unsigned buttons, unsigned modifiers, int wheel_delta_x, int wheel_delta_y);
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EventResult handle_doubleclick(CSSPixelPoint, CSSPixelPoint screen_position, unsigned button, unsigned buttons, unsigned modifiers);
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EventResult 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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EventResult handle_keydown(UIEvents::KeyCode, unsigned modifiers, u32 code_point);
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EventResult 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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Unicode::Segmenter& word_segmenter();
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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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EventResult 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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void update_selection_range_for_input_or_textarea();
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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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OwnPtr<Unicode::Segmenter> m_word_segmenter;
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};
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}
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