9. A system, comprising: a data processing apparatus; and a data store, in which is stored: a detection engine including: an input module that detects input received through an interface of the data processing apparatus, wherein the input is in a first writing system, and a timing module that calculates a temporal length of the input, the temporal length representing a duration of actuation of an input device corresponding to the input, wherein the detection engine identifies the input as content input in the first writing system when the temporal length of the input is greater than or equal to a threshold value and identifies the input as content input in a second writing system when the temporal length of the input is less than the threshold value; and an input method editor that: presents the input in the first writing system in a first interface element of the interface as content input, and when the input is identified as content input in the second writing system, identifies one or more candidates in a second writing system, based on the input in the first writing system, for display in a second interface element that is separate from the first interface element.
9. A system, comprising: a data processing apparatus; and a data store, in which is stored: a detection engine including: an input module that detects input received through an interface of the data processing apparatus, wherein the input is in a first writing system, and a timing module that calculates a temporal length of the input, the temporal length representing a duration of actuation of an input device corresponding to the input, wherein the detection engine identifies the input as content input in the first writing system when the temporal length of the input is greater than or equal to a threshold value and identifies the input as content input in a second writing system when the temporal length of the input is less than the threshold value; and an input method editor that: presents the input in the first writing system in a first interface element of the interface as content input, and when the input is identified as content input in the second writing system, identifies one or more candidates in a second writing system, based on the input in the first writing system, for display in a second interface element that is separate from the first interface element. 11. The system of claim 9 , wherein the first writing system is Pinyin and the second writing system is Hanzi.