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LibWeb: Frame/Position: Implement cursor increment/decrement methods
This introduces methods to increment and decrement the cursor position. This is non-trivial as the cursor position is specified in bytes rather than codepoints. Thus, it sometimes needs to be incremented or decremented by more than one, depending on the codepoint to "jump over". Because the cursor blink cycle needs to be reset after moving the cursor, methods calling the ones in DOM::Position are implemented in Frame. Furthermore, this allows the cursor_position() getter to stay const. :^) Additionally, it adds a offset_is_at_end_of_node() method which checks if the current offset points to the end of the node.
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4 changed files with 77 additions and 0 deletions
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@ -297,4 +297,20 @@ bool Frame::is_frame_nesting_allowed(URL const& url) const
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return m_frame_nesting_levels.get(url).value_or(0) < 3;
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}
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bool Frame::increment_cursor_position_offset()
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{
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if (!m_cursor_position.increment_offset())
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return false;
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reset_cursor_blink_cycle();
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return true;
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}
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bool Frame::decrement_cursor_position_offset()
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{
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if (!m_cursor_position.decrement_offset())
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return false;
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reset_cursor_blink_cycle();
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return true;
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}
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}
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