←Select platform

ImageViewerAutoPanInteractiveMode Class


Automatically pans the view when the mouse or touch is next to the edge.

public class ImageViewerAutoPanInteractiveMode : ImageViewerInteractiveMode 
public ref class ImageViewerAutoPanInteractiveMode : ImageViewerInteractiveMode 

ImageViewerAutoPanInteractiveMode derives from ImageViewerInteractiveMode and subscribes to the following events of the InteractiveService:

ImageViewerAutoPanInteractiveMode works when the view boundary is larger than the current image viewer client area as follows:

  • When the mouse or touch is close to the edge of the viewer, and there is more room in that direction, then this mode will call ImageViewer.ScrollByRestrict to pan the view in that direction. How far the pointer is from the boundary to be considered "close" is determined by EdgeSize. The delay before auto-panning starts is controlled by BeginDelay.

  • If the user does not move the pointer, and PanDelay elapsed, then this mode will continue panning the viewer in that direction until it reaches the maximum value allowed by ScrollByRestrict.

ImageViewerAutoPanInteractiveMode can work with or without the user holding a mouse button down through the value of MouseButtons. It can also be combined with any other mode to allow auto-panning the viewer while the other mode is running because it: * Does not set InteractiveEventArgs.IsHandled to true when working

  • Relies on the Move event instead of DragDelta, which is more common

The example code shows how to use auto-pan with ImageViewerRubberBandInteractiveMode to allow drawing a rubber band, moving towards the edge of the viewer when the user reaches the edge. This is the auto-pan adding extra functionality to rubber-band.

For more information, refer to Image Viewer Interactive Modes.

using Leadtools; 
using Leadtools.Controls; 
using Leadtools.Codecs; 
using Leadtools.Drawing; 
using Leadtools.ImageProcessing; 
using Leadtools.ImageProcessing.Color; 
var autopan = new ImageViewerAutoPanInteractiveMode(); 
autopan.PanDelay = 100; 

Target Platforms

Help Version 22.0.2023.1.24
Products | Support | Contact Us | Intellectual Property Notices
© 1991-2023 LEAD Technologies, Inc. All Rights Reserved.

Leadtools.Controls Assembly

Products | Support | Contact Us | Intellectual Property Notices
© 1991-2023 LEAD Technologies, Inc. All Rights Reserved.