e9c1d9c89a
We try scrolling a Node with the handle_mousewheel event, but if it isn't scrollable, the event should be passed back up to the page host. This is the first step in that process.
95 lines
3.6 KiB
C++
95 lines
3.6 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <LibWeb/Layout/Box.h>
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#include <LibWeb/Layout/LineBox.h>
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namespace Web::Layout {
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class BlockBox : public Box {
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public:
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BlockBox(DOM::Document&, DOM::Node*, NonnullRefPtr<CSS::StyleProperties>);
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BlockBox(DOM::Document&, DOM::Node*, CSS::ComputedValues);
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virtual ~BlockBox() override;
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virtual void paint(PaintContext&, PaintPhase) override;
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virtual HitTestResult hit_test(const Gfx::IntPoint&, HitTestType) const override;
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BlockBox* previous_sibling() { return downcast<BlockBox>(Node::previous_sibling()); }
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const BlockBox* previous_sibling() const { return downcast<BlockBox>(Node::previous_sibling()); }
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BlockBox* next_sibling() { return downcast<BlockBox>(Node::next_sibling()); }
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const BlockBox* next_sibling() const { return downcast<BlockBox>(Node::next_sibling()); }
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template<typename Callback>
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void for_each_fragment(Callback);
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template<typename Callback>
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void for_each_fragment(Callback) const;
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virtual void split_into_lines(InlineFormattingContext&, LayoutMode) override;
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bool is_scrollable() const;
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const Gfx::FloatPoint& scroll_offset() const { return m_scroll_offset; }
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void set_scroll_offset(const Gfx::FloatPoint&);
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private:
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virtual bool is_block_box() const final { return true; }
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virtual bool wants_mouse_events() const override { return true; }
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virtual bool handle_mousewheel(Badge<EventHandler>, const Gfx::IntPoint&, unsigned buttons, unsigned modifiers, int wheel_delta) override;
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bool should_clip_overflow() const;
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Gfx::FloatPoint m_scroll_offset;
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};
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template<>
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inline bool Node::fast_is<BlockBox>() const { return is_block_box(); }
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template<typename Callback>
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void BlockBox::for_each_fragment(Callback callback)
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{
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for (auto& line_box : line_boxes()) {
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for (auto& fragment : line_box.fragments()) {
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if (callback(fragment) == IterationDecision::Break)
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return;
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}
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}
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}
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template<typename Callback>
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void BlockBox::for_each_fragment(Callback callback) const
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{
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for (auto& line_box : line_boxes()) {
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for (auto& fragment : line_box.fragments()) {
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if (callback(fragment) == IterationDecision::Break)
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return;
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}
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}
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}
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}
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