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LibWeb: Start adding support for the <iframe> element! :^)

This patch introduces a bunch of things:

- Subframes (Web::Frame::create_subframe())
- HTMLIFrameElement (loads and owns the hosted Web::Frame)
- LayoutFrame (layout and rendering of the hosted frame)

There's still a huge number of things missing, like scrolling, overflow
handling, event handling, scripting, etc. But we can make a little
iframe in a document and it actually renders another document there.
I think that's pretty cool! :^)
This commit is contained in:
Andreas Kling 2020-06-05 23:36:02 +02:00
parent f2aa21ebc4
commit 422bbe98a5
13 changed files with 321 additions and 0 deletions

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@ -0,0 +1,88 @@
/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <LibGUI/Painter.h>
#include <LibGUI/ScrollBar.h>
#include <LibGUI/Widget.h>
#include <LibGfx/Font.h>
#include <LibGfx/StylePainter.h>
#include <LibWeb/DOM/Document.h>
#include <LibWeb/Frame.h>
#include <LibWeb/Layout/LayoutDocument.h>
#include <LibWeb/Layout/LayoutFrame.h>
#include <LibWeb/PageView.h>
namespace Web {
LayoutFrame::LayoutFrame(const Element& element, NonnullRefPtr<StyleProperties> style)
: LayoutReplaced(element, move(style))
{
}
LayoutFrame::~LayoutFrame()
{
}
void LayoutFrame::layout(LayoutMode layout_mode)
{
set_has_intrinsic_width(true);
set_has_intrinsic_height(true);
// FIXME: Do proper error checking, etc.
bool ok;
set_intrinsic_width(node().attribute(HTML::AttributeNames::width).to_int(ok));
set_intrinsic_height(node().attribute(HTML::AttributeNames::height).to_int(ok));
LayoutReplaced::layout(layout_mode);
}
void LayoutFrame::render(RenderingContext& context)
{
LayoutReplaced::render(context);
context.painter().save();
auto old_viewport_rect = context.viewport_rect();
context.painter().add_clip_rect(enclosing_int_rect(rect()));
context.painter().translate(x(), y());
context.set_viewport_rect({ {}, node().hosted_frame()->size() });
node().hosted_frame()->document()->layout_node()->render(context);
context.set_viewport_rect(old_viewport_rect);
context.painter().restore();
}
void LayoutFrame::did_set_rect()
{
LayoutReplaced::did_set_rect();
ASSERT(node().hosted_frame());
node().hosted_frame()->set_size(Gfx::Size(rect().width(), rect().height()));
node().hosted_frame()->document()->layout();
}
}

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@ -0,0 +1,57 @@
/*
* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include <LibWeb/Layout/LayoutReplaced.h>
#include <LibWeb/DOM/HTMLIFrameElement.h>
namespace Web {
class LayoutFrame final : public LayoutReplaced {
public:
LayoutFrame(const Element&, NonnullRefPtr<StyleProperties>);
virtual ~LayoutFrame() override;
virtual void render(RenderingContext&) override;
virtual void layout(LayoutMode) override;
const HTMLIFrameElement& node() const { return static_cast<const HTMLIFrameElement&>(LayoutReplaced::node()); }
HTMLIFrameElement& node() { return static_cast<HTMLIFrameElement&>(LayoutReplaced::node()); }
private:
virtual bool is_frame() const final { return true; }
virtual const char* class_name() const override { return "LayoutFrame"; }
virtual void did_set_rect() override;
};
template<>
inline bool is<LayoutFrame>(const LayoutNode& node)
{
return node.is_frame();
}
}

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@ -60,6 +60,7 @@ public:
bool is_anonymous() const { return !m_node; }
const Node* node() const { return m_node; }
Node* node() { return const_cast<Node*>(m_node); }
Document& document();
const Document& document() const;
@ -87,6 +88,7 @@ public:
virtual bool is_block() const { return false; }
virtual bool is_replaced() const { return false; }
virtual bool is_widget() const { return false; }
virtual bool is_frame() const { return false; }
virtual bool is_image() const { return false; }
virtual bool is_canvas() const { return false; }
virtual bool is_box() const { return false; }

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@ -37,6 +37,7 @@ public:
virtual ~LayoutReplaced() override;
const Element& node() const { return to<Element>(*LayoutNode::node()); }
Element& node() { return to<Element>(*LayoutNode::node()); }
virtual bool is_replaced() const final { return true; }