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LibWeb: Add support for handling drag-and-drop events of DOM elements

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This allows dragging elements on the page and dropping them onto other
elements. This does not yet support dragging text.

The test added here is manual; the WPT tests rely heavily on WebDriver
actions.
This commit is contained in:
Timothy Flynn
2026-04-04 18:20:12 -04:00
committed by Tim Flynn
parent b7076c366d
commit cfe7ddc805
Notes: github-actions[bot] 2026-04-05 15:35:41 +00:00 
Author: https://github.com/trflynn89
Commit: https://github.com/LadybirdBrowser/ladybird/commit/cfe7ddc8058
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/8783
6 changed files with 287 additions and 36 deletions
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3
Libraries/LibWeb/Page/EventHandler.h
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@@ -121,6 +121,7 @@ private:
GC::Ptr<Painting::PaintableBox const> paint_root() const;
bool should_ignore_device_input_event() const;
bool is_dragging_element() const;
void handle_gamepad_connected(SDL_JoystickID);
void handle_gamepad_updated(SDL_JoystickID);
@@ -139,7 +140,9 @@ private:
GC::Weak<DOM::Node> m_effective_legacy_mouse_pointer_position;
Optional<u32> m_mousedown_button;
GC::Weak<DOM::Node> m_mousedown_target;
Optional<CSSPixelPoint> m_mousedown_visual_viewport_position;
int m_mousedown_click_count { 0 };
// https://w3c.github.io/pointerevents/#the-pointerdown-event