Implementing mouseDown: on WebKit input elements

gistfile1.m

#import "MainWindow.h"

// MainWindow subclasses NSWindow
@implementation MainWindow

@synthesize webView, isHTMLInputElement;

// We intercept the sendEvent: method at the NSWindow level to inspect it.
// If the event type is a click ("NSLeftMouseDown") and the element that the mouse
// is hovering over is an input, then we do something
- (void)sendEvent:(NSEvent *)theEvent {
	if ([theEvent type] == NSLeftMouseDown && isHTMLInputElement) {
		[self doSomething];
	};
	[super sendEvent:theEvent];
}

// MainWindow acts as the UIDelegate for your WebView
// When your mouse moves over an input, we set our BOOL isHTMLInputElement to YES
- (void)webView:(WebView *)sender mouseDidMoveOverElement:(NSDictionary *)elementInformation modifierFlags:(NSUInteger)modifierFlags {

	DOMNode *node = [elementInformation objectForKey:@"WebElementDOMNode"];
	NSString *nodeName = [node nodeName];
	
	NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF MATCHES 'INPUT'"];
	isHTMLInputElement = [predicate evaluateWithObject:nodeName];

}