Modifying system-defined user interface control functionality on a computing device
A method for modifying a system-defined user interface control on a computing device is described. The method includes wrapping, on the computing device, a system-defined control within a programmer-defined control at run-time and modifying functionality of the system-defined control at run-time. Modifying functionality includes intercepting an initial message for a system-defined control, preventing the system-defined control from rendering and rendering a programmer-defined control in place of the system-defined control. Modifying functionality also includes intercepting a message for the system-defined control, determining whether the message requires modified functionality and providing modified functionality if the message requires modified functionality. Modifying functionality also includes sending the message to the system-defined control if the message does not require modified functionality and providing regular functionality if the message does not require modified functionality.
1. An apparatus, comprising:
a memory; and
a processor operatively coupled to the memory, the processor configured to:
define a set of features of a programmer-defined control based on a set of features of a system-defined control, wherein:
the set of features of the system-defined control including a property and a function associated with the system-defined control,
the system-defined control providing a first functionality, and
the programmer-defined control providing a second functionality that is an extension of the first functionality;
wrap the system-defined control in the programmer-defined control such that the programmer-defined control uses the set of features of the system-defined control;
associate the programmer-defined control with the system-defined control such that messages for the system-defined control are intercepted by the programmer-defined control and such that an edit to the set of features of the system-defined control is reflected in the set of features of the programmer-defined control;
after the programmer-defined control is associated with the system-defined control, render on a user interface the programmer-defined control;
receive, after the rendering and at run-time, a first message associated with a user interaction event on the user interface;
when the user interaction event does not require the second functionality, send the first message to the system-defined control such that the system-defined control performs a first operation based on the user interaction event; and
when the user interaction event requires the second functionality:
determine whether the second functionality can be provided; and
in response to determining that the second functionality can be provided:
obtain information from the system-defined control; and
perform a second operation to the information independent of the system-defined control.
2. The apparatus of claim 1 , wherein the processor is further configured to in response to determining that the second functionality cannot be provided, discard the first message.
3. The apparatus of claim 1 , wherein:
the system-defined control is a ListView control for displaying a table;
the programmer-defined control is configured to provide the second functionality of sorting contents of the table; and
the processor is configured to render the programmer-defined control by displaying on the user interface a sortable table including the contents of the table.
4. The apparatus of claim 1 , wherein:
when the user interaction event is a mouse-up event, the processor is configured to determine that the mouse-up event requires the second functionality; and
when the user interaction event is a text input event, the processor is configured to determine that the text input event does not require the second functionality.
5. The apparatus of claim 1 , wherein the processor is further configured to render a set of programmer-defined controls and a set of system-defined controls on the user interface in addition to rendering the programmer-defined control.
6. An apparatus, comprising:
a memory; and
a processor operatively coupled to the memory, the processor configured to:
define a set of features of a programmer-defined control based on a set of features of a system-defined control, wherein:
the set of features of the system-defined control including a property and a function associated with the system-defined control,
the system-defined control providing a first functionality, and
the programmer-defined control providing a second functionality that is an extension of the first functionality;
wrap the system-defined control in the programmer-defined control such that the programmer-defined control uses the set of features of the system-defined control;
associate the programmer-defined control with the system-defined control such that messages for the system-defined control are intercepted by the programmer-defined control and such that an edit to the set of features of the system-defined control is reflected in the set of features of the programmer-defined control;
after the programmer-defined control is associated with the system-defined control, render on a user interface the programmer-defined control;
receive, after the rendering and at run-time, a first message associated with a user interaction event on the user interface;
when the user interaction event does not require modifying the first message to implement the second functionality, send the first message to the system-defined control such that the system-defined control performs a first operation based on the user interaction event; and
when the user interaction event requires modifying the first message to implement the second functionality:
modify the first message based on the second functionality to produce a second message; and
send the second message to the system-defined control such that the system-defined control performs a second operation based on the user interaction event, the second operation being different from the first operation.
7. The apparatus of claim 6 , wherein:
the system-defined control is a ListView control for displaying a table;
the programmer-defined control is configured to provide the second functionality of sorting contents of the table; and
the processor is configured to render the programmer-defined control by displaying on the user interface a sortable table including the contents of the table.
8. The apparatus of claim 6 , wherein the second operation implements the second functionality.
9. The apparatus of claim 6 , wherein the second operation implements the second functionality that is different from the first functionality.
10. The apparatus of claim 6 , wherein:
the processor is configured to, prior to the rendering, receive a request at the run-time for the system-defined control, and
the processor is configured to render the programmer-defined control while not rendering the system-defined control in response to receiving the request.
11. The apparatus of claim 6 , wherein the processor is further configured to, when the user interaction event requires modifying the first message, perform a third operation based on the user interaction event and independent of the system-defined control.
12. A method, comprising:
defining a set of features of a programmer-defined control based on a set of features of a system-defined control, wherein:
the set of features of the system-defined control including a property and a function associated with the system-defined control,
the system-defined control providing a first functionality, and
the programmer-defined control providing a second functionality that is an extension of the first functionality;
wrapping the system-defined control in the programmer-defined control such that the programmer-defined control uses the set of features of the system-defined control;
associating the programmer-defined control with the system-defined control such that messages for the system-defined control are intercepted by the programmer-defined control and such that an edit to the set of features of the system-defined control is reflected in the set of features of the programmer-defined control;
after the programmer-defined control is associated with the system-defined control, rendering, via a compute device and at run-time, the programmer-defined control on a user interface;
intercepting, via the compute device and after the rendering, a first message associated with a user interaction event on the user interface;
determining whether the user interaction event requires the second functionality;
in response to determining that the user interaction event does not require the second functionality, sending the first message to the system-defined control such that the system-defined control performs a first operation based on the user interaction event; and
in response to determining that the user interaction event requires the second functionality:
discarding the first message; and
performing a second operation independent of the system-defined control, the second operation being different from the first operation.
13. The method of claim 12 , wherein:
the system-defined control is a ListView control for displaying a table;
the programmer-defined control is configured to provide the second functionality of sorting contents of the table; and
the rendering including displaying on the user interface a sortable table including the contents of the table.
14. The method of claim 12 , wherein the performing the second operation includes implementing the second functionality.
15. The method of claim 12 , wherein the performing the second operation includes implementing another functionality different from the first functionality of the system-defined control and the second functionality.