Clear the yoyo at the current position and attaches it to (x, y), with the handle hanging directly below.

Records a delete operation. Should be called before the deletion is actually done.

Records an insert operation. Should be called before the insertion is actually done.

注释 @param row

Copies the selected text to the clipboard. Does nothing if not in select mode.

Return a char[] with a newline as the 0th element followed by the leading spaces and tabs of the line that the caret is on 创建自动缩进

处理注释

Delete leftLength characters of text before the current caret position, and delete rightLength characters of text after the current cursor position.

Underline the caret row if the option for highlighting it is set

This method projects a yoyo string directly above the handle and determines which character it should be attached to, or -1 if no suitable character c

Start fling scrolling

Gets charCount number of consecutive characters starting from _gapStartIndex. Only UndoStack should use this method. No error checking is done.

The last row of text to paint, which may be partially visible. Deduced from the clipping rectangle given to onDraw()

实现自动完成的过滤算法

计算列表高 @return

Finds the number of char on the specified line. All valid lines contain at least one char, which may be a non-printable one like \n, \t or EOF. @retu

Resumes scanning until the next regular expression is matched, the end of input is encountered or an I/O-Error occurs. @return the next token.

Copies _contents into a buffer that is larger by minIncrement + INITIAL_GAP_SIZE _allocCount bytes. _allocMultiplier doubles on every call to this

Determines if the View has been layout or is still being constructed

Create a gap at the start of _contents[] and tack a EOF at the end. Precondition: real contents are from _contents[0] to _contents[contentsLength-1]

Only true when the InputConnection has not been used by the IME yet. Can be programatically cleared by resetComposingState()

点运算符 @param c @return

Calculates the amount to scroll horizontally if the char is not in the visible region. @param charOffset The index of the character to make visible @

Calculates the amount to scroll vertically if the char is not in the visible region. @param charOffset The index of the character to make visible @re

Calculate the implementation size of the char array needed to store textSize number of characters. The implementation size may be greater than textSiz

绘制 @param canvas

Removes row offset info from fromRow to the row that endOffset is on, inclusive. <p> No error checking is done on parameters.

保存文件 @param file