v0.4.0

This release introduces text selection feature. The internal implementation was largely refactored to handle multi-line text for this feature. As the side effect, several APIs now can handle a multi-line string (string contains newlines) correctly.

• Text selection has been implemented. (#6, #45, thanks @pm100 for the first implementation)
  
  • Default key shortcuts now support text selection. When moving the cursor with pressing a shift key, a textarea starts to select the text under the cursor. The selected text can be copied/cut by the following key shortcuts. Modifying some text while text selection deletes the selected text. Doing undo/redo cancels the ongoing text selection.

    Mappings	Description
    Ctrl+C, Copy	Copy selected text
    Ctrl+X, Cut	Cut selected text

  • The following APIs are added
    • TextArea::copy keeps the selected text as a yanked text
    • TextArea::cut deletes the selected text and keeps it as a yanked text
    • TextArea::start_selection starts text selection
    • TextArea::cancel_selection cancels text selection
    • TextArea::select_all selects the entire text
    • TextArea::set_selection_style sets the style of selected text
    • TextArea::selection_style returns the current style for selected text
• BREAKING CHANGE: col argument of TextArea::delete_str was removed. Instead, current cursor position is used. This change is for aligninig the API signature with TextArea::insert_str.
  • Before: fn delete_str(&mut self, col: usize, chars: usize) -> bool
  • After: fn delete_str(&mut self, chars: usize) -> bool
• BREAKING CHANGE: TextArea::yank_text now returns String instead of &str. This change was caused to handle yanking multiple-line text correctly.
  • Before: fn yank_text<'a>(&'a self) -> &'a str
  • After: fn yank_text(&self) -> String
• BREAKING CHANGE: shift field was added to Input to support the Shift modifier key.
• Add Key::Paste, Key::Copy, and Key::Cut. They are only supported by termwiz crate.
• Fix TextArea::insert_char didn't handle newline ('\n') correctly.
• Allow passing multi-line string to TextArea::insert_str. A string joined with newlines is inserted as multiple lines correctly.
• Allow TextArea::delete_str to delete multiple lines (#42).
• Fix TextArea::set_yank_text didn't handle multiple lines correctly.
• Fix editor example didn't handle terminal raw mode on Windows (#44).
• modal example was rebuilt as vim example. It implements Vim emulation to some level as a state machine. It adds the support for very basic visual mode and operator-pending mode. This example aims to show how to implement complicated and stateful key shortcuts.
• Add many unit test cases. Several edge cases found by them were fixed. The code coverage of this crate reached 90%.