Zoom/Panning/Scroll Controller

[John Skottis]

Example usecases:

• node graph
• map
• infinite canvas
• a pdf page larger than widget size
• image larger than widget size

Controllers:

• Zoom Controler -> Ctrl + Wheel event handling
• Scroll Controller -> up/down + left/right (for mice that have this functionality) wheel event handling. + Interacetion with scroll ui elements
• Pan Controller -> Middle Click + Drag - Widget interaction handling. There are two scenarios for this:
  • Normal Widget: Elements might extend beyond the boundaries of viewport and will need to be clipped
  • Virtual Widget: Widget elements never extend beyond viewport. Widget processes and renders only elements within the viewport.

Relevant Resrouces:

• Druid's Scroll Widget
• Druid's ClipBox
• Druid's Controller
• Pando's Canvas
• Pando's DrugController
• Runebender's Zoom Widget

[John Skottis]

Other features:

• Zoom to selection (#10)
• Zoom to fit