VisibleBounds

[Jeff Martin]

Okay - here's the jira (and a blog):

	Jira:  Node could use a getVisibleBounds() method
	Blog:  Getting the Visible Bounds of a Node

jeff


On Jun 11, 2014, at 9:37 AM, Stephen F Northover <steve.x.northover at oracle.com> wrote:

> This seems like a good enhancement request.  Please enter a JIRA for it.
> 
> Steve
> 
> On 2014-06-11, 10:17 AM, Jeff Martin wrote:
>> Below is my poor man's getVisibleBounds. I'm using this so that my custom text pane only needs to add child nodes for lines of text that are visible - similar to how ListView and friends only add cell nodes for visible items. I hope I'm on the right track - I was surprised that my web search for getVisibleBounds() came up so empty. If nobody points out my idiocy, I'm going to put this in a blog.
>> 
>> jeff
>> 
>> /**
>>  * Returns the visible bounds for a node based on ancestor clips (or null if no clipping found).
>>  */
>> public static Bounds getVisibleBounds(Node aNode)
>> {
>>     // Get parent visible bounds (if set, convert to local)
>>     Bounds bounds = aNode.getParent()!=null? getVisibleBounds(aNode.getParent()) : null;
>>     if(bounds!=null) { if(!bounds.isEmpty()) bounds = aNode.parentToLocal(bounds); else return bounds; }
>>          // If node has clip, get clip local bounds (intersected with parent visible bounds if present)
>>     if(aNode.getClip()!=null) { Node clip = aNode.getClip(); Bounds cb = clip.getBoundsInLocal();
>>         bounds = bounds!=null? getIntersectingBounds(cb, bounds) : cb; }
>>          // Return node visible bounds
>>     return bounds;
>> }
>> 
>> /**
>>  * Returns the intersection bounds of two bounds.
>>  */
>> public static Bounds getIntersectingBounds(Bounds b1, Bounds b2)
>> {
>>     if(!b1.intersects(b2)) return new BoundingBox(0,0,-1,-1);
>>     double minx = Math.max(b1.getMinX(), b2.getMinX());
>>     double miny = Math.max(b1.getMinY(), b2.getMinY());
>>     double maxx = Math.min(b1.getMaxX(), b2.getMaxX());
>>     double maxy = Math.min(b1.getMaxY(), b2.getMaxY());
>>     return new BoundingBox(minx, miny, maxx-minx, maxy-miny);
>> }
>> 
>> 
>> On Jun 10, 2014, at 6:59 PM, Jeff Martin <jeff at reportmill.com> wrote:
>> 
>>> What is the JFX equivalent of JComponent.getVisibleRect() - and is there a way to get a notification when it changes?
>>> 
>>> jeff
>