Electronic device and screen control method thereof

1. An electronic device, comprising:

a flexible display having a display area that is variable physically; and

at least one processor operably connected to the flexible display,

wherein the at least one processor is configured to:

control the flexible display to display a first window including a plurality of elements of a first application on the display area;

receive a user input to request physically enlarging the display area;

in response to the user input, physically enlarge the display area of the flexible display;

identify a core element among the plurality of elements in the first window; and

display a second window including at least part of the plurality of elements on the physically enlarged display area,

wherein, as the display area is physically enlarged, a size of the second window and a number of a plurality of elements in the second window is gradually reduced, and the core element is maintained in the second window.

2. The electronic device of claim 1 , wherein the at least one processor is further configured to:

detect a touch input to the display area selecting a first element from among the plurality of elements; and

wherein identifying the core element includes setting the first element as the core element based on the detected touch input.

3. The electronic device of claim 2 , wherein the touch input is:

received while the user input is maintained,

received within a predetermined period of time before initial detection of the user input or

received within a predetermined period of time after the initial detection of the user input.

4. The electronic device of claim 2 , wherein the touch input selecting the first element identified as the core element is detected while the user input is received.

5. The electronic device of claim 4 , wherein the touch input selecting the first element identified as the core element is maintained as the display area is physically enlarged in response to the user input.

6. The electronic device of claim 1 , further comprising a memory,

wherein default information for each of a plurality of potential display areas for the flexible display is stored in the memory, and

wherein the core element is identified based at least in part on the default information.

7. The electronic device of claim 1 , further comprising a memory,

wherein priorities associated with at least some of the plurality of elements are stored in advance in the memory, and

wherein at least one element is selected from among the plurality of elements in the first window for display of the second window based on a size of the physically enlarged display area, the core element, and the priorities.

8. The electronic device of claim 1 , wherein, as the display area is physically enlarged:

a third window separated from the second window, is added to the flexible display, and

a size of the third window and a number of a plurality of elements in the third window are gradually enlarged.

9. The electronic device of claim 1 , wherein the at least one processor is further configured to:

receive a touch input to at least a part of the display area and detect a release of the touch input, while the user input is maintained, and

set a size of the second window including the core element based on the release of the touch input.

10. The electronic device of claim 1 , wherein the flexible display is a rollable display, and

wherein the user input includes a rolling operation for enlarging a display area of the rollable display that is exposed through a frontal portion of the electronic device.

11. The electronic device of claim 1 , wherein the flexible display is a slidable display, and

wherein the user input includes a sliding operation for enlarging a display area of the slidable display that is exposed through a front portion of the electronic device.

12. A method of an electronic device, the method comprising:

displaying a first window including a plurality of elements of a first application on a flexible display having a display area that is variable physically;

receiving, via input circuitry, a user input to request physically enlarging the display area;

in response to the user input, physically enlarge the display area of the flexible display;

identifying, via at least one processor, a core element from among the plurality of elements in the first window; and

displaying a second window including at least part of the plurality of elements on the physically enlarged display area,

wherein, as the display area is physically enlarged, a size of the second window and a number of a plurality of elements in the second window is gradually reduced, and the core element is maintained in the second window.

13. The method of claim 12 , further comprising:

detecting a touch input to the display area selecting a first element from among the plurality of elements,

wherein identifying the core element includes setting the first element as the core element based on the detected touch input.

14. The method of claim 13 , wherein the touch input is:

received while the user input is maintained,

received within a predetermined period of time before initial detection of the user input, or

received within a predetermined period of time after the initial detection of the user input.

15. The method of claim 13 , wherein the touch input selecting the first element identified as the core element is detected while the user input is received.

16. The method of claim 15 , wherein the touch input selecting the first element identified as the core element is maintained as the display area is physically enlarged in response to the user input.

17. The method of claim 12 , further comprising:

storing in a memory default information for each of a plurality of potential display areas for the flexible display,

wherein the core element is identified based at least in part on the default information.

18. The method of claim 12 , further comprising:

storing priorities associated with at least some of the plurality of elements,

wherein at least one element is selected from among the plurality of elements in the first window for display of the second window based on a size of the physically enlarged display area, the core element, and the priorities.

19. The method of claim 12 , further comprising:

receiving a touch input to at least a part of the display area and detecting a release of the touch input, while the user input to request physically enlarging the display area is maintained,

setting a size of the second window including the core element based on the release of the touch input.