Scale WebView in Cocoa

Question

How can I scale the content of a WebView?

Answer 1

Javascript is your bestfriend:

 [_webview stringByEvaluatingJavaScriptFromString:@"document.documentElement.style.zoom = \"0.5\""];

Answer 2

You need to call -scaleUnitSquareToSize: on the document view of the individual frame that you want to resize, for example the main frame:

[[[[webView mainFrame] frameView] documentView] scaleUnitSquareToSize:NSMakeSize(1.5, 1.5)];
[[[[webView mainFrame] frameView] documentView] setNeedsDisplay:YES];

Answer 3

Or you can try the following:

- (IBAction)takeZoom:(NSSlider *)sender {
    WebView *aWebView = [[window.contentView subviews] lastObject];
    NSView *clipView = [[[[aWebView mainFrame] frameView] documentView] superview];
    float scale = pow( 4, [sender floatValue] )/(clipView.frame.size.width/clipView.bounds.size.width);
    [clipView scaleUnitSquareToSize:NSMakeSize(scale, scale)];
    [clipView setNeedsDisplay:YES];
}

Answer 4

A WebView is an NSView, so one way would be to send it a scaleUnitSquareToSize: message.