Integrated personal digital assistant device

1. A method performed by one or more processors of a mobile computing device, the method comprising:

executing a first application using the one or more processors;

receiving, during execution of the first application, a first user selection of a shift key;

transitioning a state of the shift key from an unlocked non-shift state to a shift state based on the user selection;

changing the currently executing application from the first application to a second application that is different than the first application; and

clearing the state of the shift key in response to changing the currently executing application.

2. The method of claim 1 , wherein the clearing comprises:

transitioning the state of the shift key from the shift state to the unlocked non-shift state.

3. The method of claim 2 , further comprising:

avoiding unintended shift key input during execution of the second application based on transitioning the state of the shift key from the shift state to the unlocked non-shift state.

4. The method of claim 1 , further comprising:

detecting the user pressing the shift key for a first period of time;

transitioning the state of the shift key to a shift lock state based on the user pressing the shift key for the first period of time; and

canceling the shift lock state of the shift key if additional user input is not detected within a second period of time.

5. The method of claim 1 , further comprising:

receiving a user selection of a key corresponding to a character;

presenting, on a touch-sensitive display of the mobile computing device, a non-capitalized version of the character based on the shift key being in the unlocked non-shift state; and

presenting, on the touch-sensitive display of the mobile computing device, a capitalized version of the character based on the shift key being in the shift state.

6. The method of claim 1 , further comprising:

receiving a user selection of a key corresponding to a character while the shift key is in the shift state;

presenting, on a touch-sensitive display of the mobile computing device, a capitalized version of the character based on the shift key being in the shift state; and

canceling the shift state of the shift key in response to presenting the capitalized version of the character.

7. The method of claim 1 , further comprising:

receiving a second user selection of the shift key during execution of the first application; and

transitioning the state of the shift key from the shift state to a shift lock state based on the second user selection.

8. The method of claim 7 , further comprising:

presenting, on a touch-sensitive display of the mobile computing device, capitalized versions of any number of characters subsequently selected by the user based on the shift key being in the shift lock state.

9. The method of claim 7 , further comprising:

receiving a third user selection of the shift key during execution of the first application; and

canceling the shift lock state of the shift key based on the third user selection.

10. The method of claim 1 , further comprising:

transitioning the state of the shift key from the shift state to a shift lock state during execution of the first application in response to receiving a second user selection of the shift key; and

transitioning the state of the shift key from the shift lock state to the unlocked non-shift state during execution of the first application in response to receiving a third user selection of the shift key.

11. A mobile computing device, comprising:

a touch-sensitive display;

one or more processors coupled to the touch-sensitive display; and

a memory resource coupled to the one or more processors, the memory resource storing instructions that, when executed by the one or more processors, cause the mobile computing device to:

execute a first application using the one or more processors;

receive, during execution of the first application, a first user selection of a shift key;

transition a state of the shift key from an unlocked non-shift state to a shift state based on the user selection;

change the currently executing application from the first application to a second application that is different than the first application; and

clear the state of the shift key in response to changing the currently executing application.

12. The mobile computing device of claim 11 , wherein execution of the instructions to clear the state of the shift key causes the mobile computing device to:

transition the state of the shift key from the shift state to the unlocked non-shift state.

13. The mobile computing device of claim 12 , wherein execution of the instructions causes the mobile computing device to:

avoid unintended shift key input during execution of the second application based on transitioning the state of the shift key from the shift state to the unlocked non-shift state.

14. The mobile computing device of claim 11 , wherein execution of the instructions causes the mobile computing device to further:

detect the user pressing the shift key for a first period of time;

transition the state of the shift key to a shift lock state based on the user pressing the shift key for the first period of time; and

cancel the shift lock state of the shift key if additional user input is not detected within a second period of time.

15. The mobile computing device of claim 11 , wherein execution of the instructions causes the mobile computing device to further:

receive a user selection of a key corresponding to a character;

present, on a touch-sensitive display of the mobile computing device, a non-capitalized version of the character based on the shift key being in the unlocked non-shift state; and

present, on the touch-sensitive display of the mobile computing device, a capitalized version of the character based on the shift key being in the shift state.

16. The mobile computing device of claim 11 , wherein execution of the instructions causes the mobile computing device to further:

receive a user selection of a key corresponding to a character while the shift key is in the shift state;

present, on a touch-sensitive display of the mobile computing device, a capitalized version of the character based on the shift key being in the shift state; and

cancel the shift state of the shift key in response to presenting the capitalized version of the character.

17. The mobile computing device of claim 11 , wherein execution of the instructions causes the mobile computing device to further:

receive a second user selection of the shift key during execution of the first application; and

transition the state of the shift key from the shift state to a shift lock state based on the second user selection.

18. The mobile computing device of claim 17 , wherein execution of the instructions causes the mobile computing device to further:

present, on a touch-sensitive display of the mobile computing device, capitalized versions of any number of characters subsequently selected by the user based on the shift key being in the shift lock state.

19. The mobile computing device of claim 17 , wherein execution of the instructions causes the mobile computing device to further:

receive a third user selection of the shift key during execution of the first application; and

cancel the shift lock state of the shift key based on the third user selection.

20. The mobile computing device of claim 11 , wherein execution of the instructions causes the mobile computing device to further:

transition the state of the shift key from the shift state to a shift lock state during execution of the first application in response to receiving a second user selection of the shift key; and

transition the state of the shift key from the shift lock state to the unlocked non-shift state during execution of the first application in response to receiving a third user selection of the shift key.