| Leadtools.Controls Namespace > ImageViewerPanZoomInteractiveMode Object : IsKeyboardEnabled Property |
get_isKeyboardEnabled();
set_isKeyboardEnabled(value);
Object.defineProperty('isKeyboardEnabled');
| Type | Description |
|---|---|
| boolean | true to enable panning and zoomming with the keyboard, otherwise; false. Default value is true. |
This value is used only when the platform has keyboard support.
When the value of IsKeyboardEnabled is true, then the viewer will pan and zoom using the following keys:
| Key | Description | |
|---|---|---|
| Up |
If the ZoomKeyModifier is pressed, zooms the viewer in. Otherwise, pans the viewer one line up (or one page if PageKeyModifier is pressed). |
|
| Down | If the ZoomKeyModifier is pressed, zooms the viewer out. | Otherwise, pans the viewer one line down (or one page if PageKeyModifier is pressed). |
| Left |
Pans the viewer one line to the left (or one page if PageKeyModifier is pressed). |
|
| Right |
Pans the viewer one line to the right (or one page if PageKeyModifier is pressed). |
|
| PageUp |
Pans the viewer one page up. |
|
| PageDown |
Pans the viewer one page down. |
|
| Home |
Pans the viewer to the minimum allowed value (top-left). |
|
| End |
Pans the viewer to the maximum allowed value (bottom-right). |
The values of a "page" is calculated as follows:
If the viewer has more than one item, then "page" is the width or height of the current largest visible item (GetLargestVisibleItem.
If the viewer has one item, then "page" is the current view area width or height ViewBounds.
The value of "line" is always tenth of "page".