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a8077f79cc
This input event handling change is intended to address the following design issues: - Having `DOM::Position` is unnecessary complexity when `Selection` exists because caret position could be described by the selection object with a collapsed state. Before this change, we had to synchronize those whenever one of them was modified, and there were already bugs caused by that, i.e., caret position was not changed when selection offset was modified from the JS side. - Selection API exposes selection offset within `<textarea>` and `<input>`, which is not supposed to happen. These objects should manage their selection state by themselves and have selection offset even when they are not displayed. - `EventHandler` looks only at `DOM::Text` owned by `DOM::Position` while doing text manipulations. It works fine for `<input>` and `<textarea>`, but `contenteditable` needs to consider all text descendant text nodes; i.e., if the cursor is moved outside of `DOM::Text`, we need to look for an adjacent text node to move the cursor there. With this change, `EventHandler` no longer does direct manipulations on caret position or text content, but instead delegates them to the active `InputEventsTarget`, which could be either `FormAssociatedTextControlElement` (for `<input>` and `<textarea>`) or `EditingHostManager` (for `contenteditable`). The `Selection` object is used to manage both selection and caret position for `contenteditable`, and text control elements manage their own selection state that is not exposed by Selection API. This change improves text editing on Discord, as now we don't have to refocus the `contenteditable` element after character input. The problem was that selection manipulations from the JS side were not propagated to `DOM::Position`. I expect this change to make future correctness improvements for `contenteditable` (and `designMode`) easier, as now it's decoupled from `<input>` and `<textarea>` and separated from `EventHandler`, which is quite a busy file.
85 lines
3.3 KiB
C++
85 lines
3.3 KiB
C++
/*
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* Copyright (c) 2020, Andreas Kling <andreas@ladybird.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, bool repeat);
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EventResult handle_keyup(UIEvents::KeyCode, unsigned modifiers, u32 code_point, bool repeat);
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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, bool repeat);
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[[nodiscard]] EventResult input_event(FlyString const& event_name, FlyString const& input_type, HTML::Navigable&, 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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InputEventsTarget* m_mouse_selection_target { nullptr };
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JS::GCPtr<Painting::Paintable> m_mouse_event_tracking_paintable;
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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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