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LibHTML: Build some foundation for text selection

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Add LayoutPosition and LayoutRange classes. The layout tree root node
now has a selection() LayoutRange. It's essentially a start and end
LayoutPosition.

A LayoutPosition is a LayoutNode, and an optional index into that node.
The index is only relevant for text nodes, where it's the character
index into the rendered text.

HtmlView now updates the selection start/end of the LayoutDocument when
clicking and dragging with the left mouse button.

We don't paint the selection yet, and there's no way to copy what's
selected. It only exists as a LayoutRange.
This commit is contained in:
Andreas Kling 2019-11-05 22:13:26 +01:00
parent 2755184e11
commit f3f0b08d43
8 changed files with 119 additions and 2 deletions
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3
Libraries/LibHTML/HtmlView.h
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@ -43,12 +43,15 @@ protected:
virtual void paint_event(GPaintEvent&) override;
virtual void mousemove_event(GMouseEvent&) override;
virtual void mousedown_event(GMouseEvent&) override;
virtual void mouseup_event(GMouseEvent&) override;
virtual void keydown_event(GKeyEvent&) override;
private:
void layout_and_sync_size();
void dump_selection(const char* event_name);
RefPtr<Frame> m_main_frame;
bool m_should_show_line_box_borders { false };
bool m_in_mouse_selection { false };
};