[webkit-dev] Programmatically Selecting a DOMRange in a WebView and New WebKit-Related Bug in Apple Mail

[Timothy Hatcher]

You are unable to select images like Mail because of a recent change  
in WebKit's user agent style-sheet. We now add "-khtml-user-select:  
element" to images and other elements to improve normal browsing and  
editing. This change was introduced in 10.4.6.

We also fixed khtml-user-select: none to have the following  
additional behavior (that matches Firefox's implementation of the  
property as well)
  (a) If you mouse down (or click, double click, triple click) inside  
a "none" region, the selection should not be cleared or changed
  (b) If you drag from within a "none" region out to a selectable  
region, no selection should be changed or started.

This change added a new value to khtml-user-select called "element"  
that is used for any object that should have the behavior of (a) and  
(b) above (but that is selectable aside from that).  This includes  
images, links, buttons, and so on. This fixed the big contenteditable  
issue and selection is no longer cleared now when you click on these  
controls (or on links). This behavior matches other browsers.

You will need to add a author style-sheet that overrides -khtml-user- 
select this like:

img {
     -khtml-user-select: auto;
}

For the other bugs you mention you should file individual bug reports  
at http://bugreport.apple.com

— Timothy Hatcher


On Jul 5, 2006, at 1:02 PM, Steven Schuldt wrote:

> All:
>
> I've been unable to programmatically select a DOMRange in a WebView  
> (this on Mac OS X 10.4.7).  I'm trying to emulate the behavior one  
> can see in an editable WebView such as in Mail.app's compose window  
> where the user can click on an image (to begin a drag for example)  
> and the WebView immediately selects the image prior to the drag  
> action.  The simple case fails:
>
> 	DOMRange *range = [myWebView editableDOMRangeForPoint: [[self  
> window] convertScreenToBase:[NSEvent mouseLocation]]];	
> 	[range collapse:NO];
> 	[ myWebView setSelectedDOMRange:range affinity:[myWebView  
> selectionAffinity]];
>
> And worse, there appears to be a bug (or an undocumented API  
> change) whereby the WebEditingDelegate method:
>
> - (BOOL)webView:(WebView *)webView shouldChangeSelectedDOMRange: 
> (DOMRange *)currentRange toDOMRange:(DOMRange *)proposedRange  
> affinity:(NSSelectionAffinity)selectionAffinity stillSelecting: 
> (BOOL)flag;
>
> WebEditingDelegate method is no longer called.
>
> Also: The latest changes to WebKit's editing capabilities as Apple  
> now distributes them with 10.4.7 have broken something fundamental  
> in DOMRange selection.  Whatever hack Apple used to use to perform  
> the above magic I'm trying to emulate has itself broken now.  To  
> see the bug, drag a few small images into Mail.app.  Now try to  
> move them around by dragging them to rearrange their order.  Note  
> how Mail.app programmatically selects two images instead of just  
> the one you're dragging.
>
> Any pointers appreciated.  Thanks!
>
> Steven
>
>
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> webkit-dev at opendarwin.org
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