I have a window which owns a webview over which I place buttons (in their own
subviews) where the user has clicked. However, because they are not part of
the webview's hierarchy of objects, when the window is resized the webview
content will likely reflow. I therefore need to reposition the buttons. I have
methods which annotate the DOM and which cache references to the nodes the user
has selected. I am thinking to walk the cache of nodes and redraw the button's
views at the new location of the corresponding DOM element. I am halfway
through implementing this strategy but would be interested to hear other
opinions of how this might be achieved.
Below is some of the code I have in the works which responds to the window's
windowDidResizeNotification in the windowController and instructs the webView
to walk the cache of user-selected DOM nodes. At present I cannot seem to
recall the DOM nodes from the dictionary in which the code caches them.
#import <Cocoa/Cocoa.h>
#import <WebKit/WebKit.h>
#import "RSWebView.h"
//
// this controller is both windowController and webview frameLoadDelegate
@interface RSTrixieController : NSWindowController < NSComboBoxDataSource,
NSComboBoxDelegate >
@property (retain) IBOutlet RSWebView * webview;
- (void) refreshWebviewOverlay:(NSNotification*)nota;
@end
@implementation
@synthesize webview;
- (void)windowDidLoad
{
[super windowDidLoad];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(refreshWebviewOverlay:) name:NSWindowDidResizeNotification
object:[webview window]];
}
- (void) refreshWebviewOverlay:(NSNotification*)nota {
[[self webview] repositionLocatorViews];
}
[…]
@end
Then from the webView which responds:
@implementation
@synthesize boundingBox; // trivial view which draws it's outline
@synthesize locators; // mutable dict - button-hosting views -
keyed-alike to taggedNodes
@synthesize taggedNodes; // mutable dict - DOMElements adjacent -
keyed-alike to locators
- (void) repositionLocatorViews {
// clean up
[self removeBoundingBox];
for(NSString * idtag in [taggedNodes allKeys])
{
DOMElement * node = [taggedNodes objectForKey:idtag];
RSBoundingBox * bbox = [[RSBoundingBox alloc]
initWithFrame:[node boundingBox]];
NSRect newBox = [self flipBoundingBox:[bbox frame]
fromWebView:self];
[bbox setFrame:newBox];
RSLocatorViewController * lv = [locators objectForKey:idtag];
[[lv view]setFrame: [self frameRelativeTo:bbox]];
}
}
- (NSRect) flipBoundingBox:(NSRect)htmlBox fromWebView:(WebView*)webView {
NSRect bounds = [[[webView window] contentView] bounds];
float newY = bounds.size.height - htmlBox.size.height -
htmlBox.origin.y;
return NSMakeRect(htmlBox.origin.x,newY,htmlBox.size.width,
htmlBox.size.height);
}
- (NSRect) frameRelativeTo:(RSBoundingBox*)bbox {
return NSMakeRect(bbox.frame.origin.x-20, bbox.frame.origin.y +
bbox.frame.size.height - 20, 20, 20);
}
- (void) removeBoundingBox {
if(nil != boundingBox)
{
[boundingBox removeFromSuperview];
boundingBox = nil;
}
}
[ … ]
Any thoughts and suggestions welcomed.
Erik Stainsby
[email protected]
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