Scrolling Through Images

Users can scroll through an image using the current navigation schema described in Web Browser Navigation in Chapter 6. The Up and Down navigation buttons move up and down the page to a portion of the image that is not initially visible on the display.

If the image is larger than the six display lines, pressing and holding the Up navigation button moves up an entire screen and displays the previous six lines of the image. If the image is larger than the six display lines, pressing and holding the Down navigation button moves down an entire screen and displays the next six lines of the image.

• The focus drops to the bottom line of the image if the entire image can fit on the screen. For example, assume the image spans lines 1 to 5, and line 1 is in focus. The user presses the Down navigation button, and the focus shifts to the bottom of the image on line 5. If the user focuses on line 2 and presses the Down navigation button, again, the last line of the image on the screen is put in focus.
• If the image does not fit on the screen, pressing the Down navigation button changes the focus to the last line on the screen. For example, if the image spans lines 1 to 6 and does not fit on the screen, the focus shifts to the bottom of the screen on line 6.
• If the image is larger than the six display lines, the focus moves to line 7 and the next six lines of image display.

When the user focuses on the last line of an image and the image spans multiple lines on the screen, the following occurs when the user presses the Up navigation button:

• The focus goes to the first line of the image if the entire image can fit on the screen. For example, if the image spans lines 1 to 5, the user focuses on line 5 and presses the Up navigation button. The focus shifts to the first line of the image on line 1. If the user focuses on line 2 and presses line up, again the first line of the image on the screen will be in focus.
• If the image does not fit on the screen, pressing the Up navigation button shifts the focus to the first line on the screen. For example, if the image spans lines 1 to 6 and does not fit on the screen, the focus shifts to the bottom of the screen on line 6.

As another example, an image takes up three of the six available display lines. The user scrolls to any of the three lines displaying the image, presses OK and the entire three lines of the image are brought into focus. The image itself does not change color when in focus, but the screen area outside of the image changes color when in focus.