iosMain.com.multiplatform.webview.web.WKNavigationDelegate.kt Maven / Gradle / Ivy

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package com.multiplatform.webview.web

import com.multiplatform.webview.util.KLogger
import platform.Foundation.NSError
import platform.WebKit.WKNavigation
import platform.WebKit.WKNavigationDelegateProtocol
import platform.WebKit.WKWebView
import platform.darwin.NSObject

/**
 * Created By Kevin Zou On 2023/9/13
 */

/**
 * Navigation delegate for the WKWebView
 */
@Suppress("CONFLICTING_OVERLOADS")
class WKNavigationDelegate(
    private val state: WebViewState,
    private val navigator: WebViewNavigator,
) : NSObject(), WKNavigationDelegateProtocol {
    /**
     * Called when the web view begins to receive web content.
     */
    override fun webView(
        webView: WKWebView,
        didStartProvisionalNavigation: WKNavigation?,
    ) {
        state.loadingState = LoadingState.Loading(0f)
        state.lastLoadedUrl = webView.URL.toString()
        state.errorsForCurrentRequest.clear()
        KLogger.info {
            "didStartProvisionalNavigation"
        }
    }

    /**
     * Called when the web view receives a server redirect.
     */
    override fun webView(
        webView: WKWebView,
        didCommitNavigation: WKNavigation?,
    ) {
        val supportZoom = if (state.webSettings.supportZoom) "yes" else "no"

        @Suppress("ktlint:standard:max-line-length")
        val script = "var meta = document.createElement('meta');meta.setAttribute('name', 'viewport');meta.setAttribute('content', 'width=device-width, initial-scale=${state.webSettings.zoomLevel}, maximum-scale=10.0, minimum-scale=0.1,user-scalable=$supportZoom');document.getElementsByTagName('head')[0].appendChild(meta);"
        webView.evaluateJavaScript(script) { _, _ -> }
        KLogger.info { "didCommitNavigation" }
    }

    /**
     * Called when the web view finishes loading.
     */
    override fun webView(
        webView: WKWebView,
        didFinishNavigation: WKNavigation?,
    ) {
        state.pageTitle = webView.title
        state.lastLoadedUrl = webView.URL.toString()
        state.loadingState = LoadingState.Finished
        navigator.canGoBack = webView.canGoBack
        navigator.canGoForward = webView.canGoForward
        KLogger.info { "didFinishNavigation" }
    }

    /**
     * Called when the web view fails to load content.
     */
    override fun webView(
        webView: WKWebView,
        didFailProvisionalNavigation: WKNavigation?,
        withError: NSError,
    ) {
        KLogger.e {
            "WebView Loading Failed with error: ${withError.localizedDescription}"
        }
        state.errorsForCurrentRequest.add(
            WebViewError(
                withError.code.toInt(),
                withError.localizedDescription,
            ),
        )
        KLogger.e {
            "didFailNavigation"
        }
    }
}