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WebContent: Basic scrolling support! :^)

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The WebContentView widget now inherits from GUI::ScrollableWidget and
will pass its scroll offset over to the WebContent process as it's
changing. This is not super efficient and can get a bit laggy, but it
will do fine as an initial scrolling implementation.

Just like the single-process Web::PageView widget, WebContentView also
paints scrolled content by translating the Gfx::Painter.
This commit is contained in:
Andreas Kling 2020-07-04 23:19:32 +02:00
parent ada3c9ca46
commit e91871aed7
7 changed files with 58 additions and 13 deletions
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33
Services/WebContent/PageHost.cpp
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@ -66,26 +66,33 @@ void PageHost::set_palette_impl(const Gfx::PaletteImpl& impl)
m_palette_impl = impl;
}
Web::LayoutDocument* PageHost::layout_root()
{
auto* document = page().main_frame().document();
if (!document)
return nullptr;
return document->layout_node();
}
void PageHost::paint(const Gfx::IntRect& content_rect, Gfx::Bitmap& target)
{
Gfx::Painter painter(target);
Gfx::IntRect bitmap_rect { {}, content_rect.size() };
auto* document = page().main_frame().document();
if (!document)
return;
auto* layout_root = document->layout_node();
auto* layout_root = this->layout_root();
if (!layout_root) {
painter.fill_rect(content_rect, Color::White);
painter.fill_rect(bitmap_rect, Color::White);
return;
}
painter.fill_rect(content_rect, document->background_color(palette()));
painter.fill_rect(bitmap_rect, layout_root->document().background_color(palette()));
if (auto background_bitmap = document->background_image()) {
painter.draw_tiled_bitmap(content_rect, *background_bitmap);
if (auto background_bitmap = layout_root->document().background_image()) {
painter.draw_tiled_bitmap(bitmap_rect, *background_bitmap);
}
painter.translate(-content_rect.x(), -content_rect.y());
Web::PaintContext context(painter, palette(), Gfx::IntPoint());
context.set_viewport_rect(content_rect);
layout_root->paint_all_phases(context);
@ -109,4 +116,12 @@ void PageHost::page_did_change_selection()
m_client.post_message(Messages::WebContentClient::DidChangeSelection());
}
void PageHost::page_did_layout()
{
auto* layout_root = this->layout_root();
ASSERT(layout_root);
auto content_size = enclosing_int_rect(layout_root->absolute_rect()).size();
m_client.post_message(Messages::WebContentClient::DidLayout(content_size));
}
}