WebView.connectDecidePolicy

Connect to DecidePolicy signal.

This signal is emitted when WebKit is requesting the client to decide a policy decision, such as whether to navigate to a page, open a new window or whether or not to download a resource. The #WebKitNavigationPolicyDecision passed in the decision argument is a generic type, but should be casted to a more specific type when making the decision. For example:

static gboolean
decide_policy_cb (WebKitWebView *web_view,
                  WebKitPolicyDecision *decision,
                  WebKitPolicyDecisionType type)
{
    switch (type) {
    case WEBKIT_POLICY_DECISION_TYPE_NAVIGATION_ACTION: {
        WebKitNavigationPolicyDecision *navigation_decision = WEBKIT_NAVIGATION_POLICY_DECISION (decision);
        // Make a policy decision here
        break;
    }
    case WEBKIT_POLICY_DECISION_TYPE_NEW_WINDOW_ACTION: {
        WebKitNavigationPolicyDecision *navigation_decision = WEBKIT_NAVIGATION_POLICY_DECISION (decision);
        // Make a policy decision here
        break;
    }
    case WEBKIT_POLICY_DECISION_TYPE_RESPONSE:
        WebKitResponsePolicyDecision *response = WEBKIT_RESPONSE_POLICY_DECISION (decision);
        // Make a policy decision here
        break;
    default:
        // Making no decision results in webkit_policy_decision_use()
        return FALSE;
    }
    return TRUE;
}

It is possible to make policy decision asynchronously, by simply calling gobject.object.ObjectWrap.ref_ on the decision argument and returning true to block the default signal handler. If the last reference is removed on a #WebKitPolicyDecision and no decision has been made explicitly, webkit.policy_decision.PolicyDecision.use will be the default policy decision. The default signal handler will simply call webkit.policy_decision.PolicyDecision.use. Only the first policy decision chosen for a given #WebKitPolicyDecision will have any affect.