Electronic device for controlling display of multiple window, operation method thereof, and storage medium

A method for controlling display of a multiple window by an electronic device, the method comprising:

• displaying a first window of an application through a display of the electronic device, the first window displaying a plurality of items representing a plurality of tasks provided by the application;
• based on a first input to select a first item among the plurality of items on the first window of the application, displaying a second window over a first partial area of the first window, the second window being associated with at least one task corresponding to the first item among a plurality of tasks of the application;
• based on a second input through the first window, controlling a transparency of the second window to display both the first partial area of the first window and the second window;
• in response to the second input being released, controlling the transparency of the second window to display the second window over the first partial area of the first window;
• based on a third input, displaying a third window over a second partial area of the second window;
• based on a fourth input through the second window, controlling a transparency of the third window to display both the second partial area of the second window and the third window;
• in response to the fourth input being released, controlling the transparency of the third window to display the third window over the second partial area of the second window;
• receiving simultaneous inputs on both the first window and the second window;
• and
• based on the simultaneous inputs on both the first and second windows, controlling a transparency of the second and third windows such that the first partial area of the first window is visually exposed,
• wherein the simultaneous inputs comprise a multitouch on both the first and second windows.

A non-transitory storage medium storing instructions configured to, when executed by at least one processor of an electronic device, enable the electronic device to perform at least one operation, the at least one operation comprising:

• displaying a first window of an application through a display of the electronic device the first window displaying a plurality of items representing a plurality of tasks provided by the application;
• based on a first input to select a first item among the plurality of items on the first window of the application, displaying a second window over a first partial area of the first window, the second window being associated with at least one task corresponding to the first item among a plurality of tasks of the application;
• based on a second input through the first window, controlling a transparency of the second window to display both the first partial area of the first window and the second window;
• in response to the second input being released, controlling the transparency of the second window to display the second window over the first partial area of the first window;
• based on a third input, displaying a third window over a second partial area of the second window:
• based on a fourth input through the second window, controlling a transparency of the third window to display both the second partial area of the second window and the third window;
• in response to the fourth input being released, controlling the transparency of the third window to display the third window over the second partial area of the second window;
• receiving simultaneous inputs on both the first window and the second window;
• and
• based on the simultaneous inputs on both the first and second windows, controlling a transparency of the second and third windows such that the first partial area of the first window is visually exposed,
• wherein the simultaneous inputs comprise a multitouch on both the first and second windows.