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LibWeb+WebContent+UI: Support image cursors
The `cursor` property accepts a list of possible cursors, which behave as a fallback: We use whichever cursor is the first available one. This is a little complicated because initially, any remote images have not loaded, so we need to use the fallback standard cursor, and then switch to another when it loads. So, ComputedValues stores a Vector of cursors, and then in EventHandler we scan down that list until we find a cursor that's ready for use. The spec defines cursors as being `<url>`, but allows for `<image>` instead. That includes functions like `linear-gradient()`. This commit implements image cursors in the Qt UI, but not AppKit.
This commit is contained in:
Sam Atkins
Andreas Kling
parent
fd2414ba35
commit
bfd7ac1204
Notes:
github-actions[bot]
2025-02-28 12:51:27 +00:00
Author: https://github.com/AtkinsSJ
Commit: bfd7ac1204
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/3644
20 changed files with 297 additions and 170 deletions
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@ -83,65 +83,81 @@ static bool parent_element_for_event_dispatch(Painting::Paintable& paintable, GC
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return node && layout_node;
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}
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static Gfx::StandardCursor cursor_css_to_gfx(CSS::Cursor cursor)
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static Gfx::Cursor resolve_cursor(Layout::NodeWithStyle const& layout_node, Vector<CSS::CursorData> const& cursor_data, Gfx::StandardCursor auto_cursor)
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{
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switch (cursor) {
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case CSS::Cursor::Crosshair:
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case CSS::Cursor::Cell:
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return Gfx::StandardCursor::Crosshair;
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case CSS::Cursor::Grab:
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case CSS::Cursor::Grabbing:
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return Gfx::StandardCursor::Drag;
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case CSS::Cursor::Pointer:
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return Gfx::StandardCursor::Hand;
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case CSS::Cursor::Help:
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return Gfx::StandardCursor::Help;
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case CSS::Cursor::None:
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return Gfx::StandardCursor::Hidden;
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case CSS::Cursor::NotAllowed:
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return Gfx::StandardCursor::Disallowed;
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case CSS::Cursor::Text:
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case CSS::Cursor::VerticalText:
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return Gfx::StandardCursor::IBeam;
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case CSS::Cursor::Move:
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case CSS::Cursor::AllScroll:
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return Gfx::StandardCursor::Move;
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case CSS::Cursor::Progress:
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case CSS::Cursor::Wait:
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return Gfx::StandardCursor::Wait;
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case CSS::Cursor::ColResize:
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return Gfx::StandardCursor::ResizeColumn;
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case CSS::Cursor::EResize:
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case CSS::Cursor::WResize:
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case CSS::Cursor::EwResize:
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return Gfx::StandardCursor::ResizeHorizontal;
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case CSS::Cursor::RowResize:
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return Gfx::StandardCursor::ResizeRow;
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case CSS::Cursor::NResize:
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case CSS::Cursor::SResize:
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case CSS::Cursor::NsResize:
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return Gfx::StandardCursor::ResizeVertical;
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case CSS::Cursor::NeResize:
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case CSS::Cursor::SwResize:
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case CSS::Cursor::NeswResize:
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return Gfx::StandardCursor::ResizeDiagonalBLTR;
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case CSS::Cursor::NwResize:
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case CSS::Cursor::SeResize:
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case CSS::Cursor::NwseResize:
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return Gfx::StandardCursor::ResizeDiagonalTLBR;
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case CSS::Cursor::ZoomIn:
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case CSS::Cursor::ZoomOut:
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return Gfx::StandardCursor::Zoom;
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case CSS::Cursor::ContextMenu:
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case CSS::Cursor::Alias:
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case CSS::Cursor::Copy:
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case CSS::Cursor::NoDrop:
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// FIXME: No corresponding GFX Standard Cursor, fallthrough to None
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case CSS::Cursor::Auto:
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case CSS::Cursor::Default:
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default:
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return Gfx::StandardCursor::None;
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for (auto const& cursor : cursor_data) {
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auto result = cursor.visit(
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[auto_cursor](CSS::Cursor css_cursor) -> Optional<Gfx::Cursor> {
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switch (css_cursor) {
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case CSS::Cursor::Crosshair:
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case CSS::Cursor::Cell:
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return Gfx::StandardCursor::Crosshair;
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case CSS::Cursor::Grab:
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case CSS::Cursor::Grabbing:
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return Gfx::StandardCursor::Drag;
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case CSS::Cursor::Pointer:
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return Gfx::StandardCursor::Hand;
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case CSS::Cursor::Help:
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return Gfx::StandardCursor::Help;
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case CSS::Cursor::None:
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return Gfx::StandardCursor::Hidden;
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case CSS::Cursor::NotAllowed:
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return Gfx::StandardCursor::Disallowed;
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case CSS::Cursor::Text:
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case CSS::Cursor::VerticalText:
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return Gfx::StandardCursor::IBeam;
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case CSS::Cursor::Move:
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case CSS::Cursor::AllScroll:
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return Gfx::StandardCursor::Move;
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case CSS::Cursor::Progress:
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case CSS::Cursor::Wait:
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return Gfx::StandardCursor::Wait;
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case CSS::Cursor::ColResize:
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return Gfx::StandardCursor::ResizeColumn;
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case CSS::Cursor::EResize:
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case CSS::Cursor::WResize:
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case CSS::Cursor::EwResize:
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return Gfx::StandardCursor::ResizeHorizontal;
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case CSS::Cursor::RowResize:
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return Gfx::StandardCursor::ResizeRow;
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case CSS::Cursor::NResize:
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case CSS::Cursor::SResize:
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case CSS::Cursor::NsResize:
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return Gfx::StandardCursor::ResizeVertical;
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case CSS::Cursor::NeResize:
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case CSS::Cursor::SwResize:
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case CSS::Cursor::NeswResize:
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return Gfx::StandardCursor::ResizeDiagonalBLTR;
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case CSS::Cursor::NwResize:
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case CSS::Cursor::SeResize:
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case CSS::Cursor::NwseResize:
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return Gfx::StandardCursor::ResizeDiagonalTLBR;
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case CSS::Cursor::ZoomIn:
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case CSS::Cursor::ZoomOut:
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return Gfx::StandardCursor::Zoom;
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case CSS::Cursor::Auto:
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return auto_cursor;
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case CSS::Cursor::ContextMenu:
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case CSS::Cursor::Alias:
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case CSS::Cursor::Copy:
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case CSS::Cursor::NoDrop:
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// FIXME: No corresponding GFX Standard Cursor, fallthrough to None
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case CSS::Cursor::Default:
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default:
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return Gfx::StandardCursor::None;
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}
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},
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[&layout_node](NonnullRefPtr<CSS::CursorStyleValue> const& cursor_style_value) -> Optional<Gfx::Cursor> {
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if (auto image_cursor = cursor_style_value->make_image_cursor(layout_node); image_cursor.has_value())
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return image_cursor.release_value();
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return {};
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});
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if (result.has_value())
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return result.release_value();
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}
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// We should never get here
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return Gfx::StandardCursor::None;
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}
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// https://drafts.csswg.org/cssom-view/#dom-mouseevent-offsetx
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@ -692,7 +708,7 @@ EventResult EventHandler::handle_mousemove(CSSPixelPoint viewport_position, CSSP
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bool hovered_node_changed = false;
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bool is_hovering_link = false;
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Gfx::StandardCursor hovered_node_cursor = Gfx::StandardCursor::None;
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Gfx::Cursor hovered_node_cursor = Gfx::StandardCursor::None;
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GC::Ptr<Painting::Paintable> paintable;
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Optional<int> start_index;
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@ -721,7 +737,7 @@ EventResult EventHandler::handle_mousemove(CSSPixelPoint viewport_position, CSSP
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return EventResult::Dropped;
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}
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auto const cursor = paintable->computed_values().cursor();
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auto cursor_data = paintable->computed_values().cursor();
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auto pointer_events = paintable->computed_values().pointer_events();
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// FIXME: Handle other values for pointer-events.
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VERIFY(pointer_events != CSS::PointerEvents::None);
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@ -739,15 +755,9 @@ EventResult EventHandler::handle_mousemove(CSSPixelPoint viewport_position, CSSP
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is_hovering_link = true;
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if (paintable->layout_node().is_text_node()) {
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if (cursor == CSS::Cursor::Auto)
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hovered_node_cursor = Gfx::StandardCursor::IBeam;
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else
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hovered_node_cursor = cursor_css_to_gfx(cursor);
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hovered_node_cursor = resolve_cursor(*paintable->layout_node().parent(), cursor_data, Gfx::StandardCursor::IBeam);
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} else if (node->is_element()) {
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if (cursor == CSS::Cursor::Auto)
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hovered_node_cursor = Gfx::StandardCursor::Arrow;
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else
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hovered_node_cursor = cursor_css_to_gfx(cursor);
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hovered_node_cursor = resolve_cursor(static_cast<Layout::NodeWithStyle&>(*layout_node), cursor_data, Gfx::StandardCursor::Arrow);
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}
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auto page_offset = compute_mouse_event_page_offset(viewport_position);
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@ -793,7 +803,10 @@ EventResult EventHandler::handle_mousemove(CSSPixelPoint viewport_position, CSSP
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auto& page = m_navigable->page();
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if (page.current_cursor() != hovered_node_cursor) {
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// FIXME: This check is only approximate. ImageCursors from the same CursorStyleValue share bitmaps, but may repaint them.
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// So comparing them does not tell you if they are the same image. Also, the image may change even if the hovered
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// node does not.
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if (page.current_cursor() != hovered_node_cursor || hovered_node_changed) {
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page.set_current_cursor(hovered_node_cursor);
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page.client().page_did_request_cursor_change(hovered_node_cursor);
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}
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