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webview_impl.dart
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webview_impl.dart
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import 'dart:async';
import 'dart:convert';
import 'dart:io';
import 'package:flutter/foundation.dart';
import 'package:flutter/services.dart';
import 'webview.dart';
class WebviewImpl extends Webview {
final int viewId;
final MethodChannel channel;
final Map<String, JavaScriptMessageHandler> _javaScriptMessageHandlers = {};
bool _closed = false;
PromptHandler? _promptHandler;
final _closeCompleter = Completer<void>();
OnHistoryChangedCallback? _onHistoryChanged;
final ValueNotifier<bool> _isNavigating = ValueNotifier<bool>(false);
OnUrlRequestCallback? _onUrlRequestCallback = null;
final Set<OnWebMessageReceivedCallback> _onWebMessageReceivedCallbacks = {};
WebviewImpl(this.viewId, this.channel);
@override
Future<void> get onClose => _closeCompleter.future;
void onClosed() {
_closed = true;
_closeCompleter.complete();
}
void onJavaScriptMessage(String name, dynamic body) {
assert(!_closed);
final handler = _javaScriptMessageHandlers[name];
assert(handler != null, "handler $name is not registed.");
handler?.call(name, body);
}
String onRunJavaScriptTextInputPanelWithPrompt(
String prompt, String defaultText) {
assert(!_closed);
return _promptHandler?.call(prompt, defaultText) ?? defaultText;
}
void onHistoryChanged(bool canGoBack, bool canGoForward) {
assert(!_closed);
_onHistoryChanged?.call(canGoBack, canGoForward);
}
void onNavigationStarted() {
_isNavigating.value = true;
}
bool notifyUrlChanged(String url) {
if(_onUrlRequestCallback != null) {
return _onUrlRequestCallback!(url);
} else {
return true;
}
}
void notifyWebMessageReceived(String message) {
for (final callback in _onWebMessageReceivedCallbacks) {
callback(message);
}
}
void onNavigationCompleted() {
_isNavigating.value = false;
}
@override
ValueListenable<bool> get isNavigating => _isNavigating;
@override
void registerJavaScriptMessageHandler(
String name, JavaScriptMessageHandler handler) {
if (!Platform.isMacOS) {
return;
}
assert(!_closed);
if (_closed) {
return;
}
assert(name.isNotEmpty);
assert(!_javaScriptMessageHandlers.containsKey(name));
_javaScriptMessageHandlers[name] = handler;
channel.invokeMethod("registerJavaScripInterface", {
"viewId": viewId,
"name": name,
});
}
@override
void unregisterJavaScriptMessageHandler(String name) {
if (!Platform.isMacOS) {
return;
}
if (_closed) {
return;
}
channel.invokeMethod("unregisterJavaScripInterface", {
"viewId": viewId,
"name": name,
});
}
@override
void setPromptHandler(PromptHandler? handler) {
if (!Platform.isMacOS) {
return;
}
_promptHandler = handler;
}
@override
void launch(String url, {bool triggerOnUrlRequestEvent=true}) async {
await channel.invokeMethod("launch", {
"url": url,
"viewId": viewId,
"triggerOnUrlRequestEvent": triggerOnUrlRequestEvent,
});
}
@override
void setBrightness(Brightness? brightness) {
/// -1 : system default
/// 0 : dark
/// 1 : light
if (!Platform.isMacOS) {
return;
}
channel.invokeMethod("setBrightness", {
"viewId": viewId,
"brightness": brightness?.index ?? -1,
});
}
@override
void addScriptToExecuteOnDocumentCreated(String javaScript) {
if (!(Platform.isWindows || Platform.isLinux || Platform.isMacOS)) {
return;
}
assert(javaScript.trim().isNotEmpty);
channel.invokeMethod("addScriptToExecuteOnDocumentCreated", {
"viewId": viewId,
"javaScript": javaScript,
});
}
@override
Future<void> setApplicationNameForUserAgent(String applicationName) async {
if (!(Platform.isWindows || Platform.isLinux || Platform.isMacOS)) {
return;
}
await channel.invokeMethod("setApplicationNameForUserAgent", {
"viewId": viewId,
"applicationName": applicationName,
});
}
@override
Future<void> forward() {
return channel.invokeMethod("forward", {"viewId": viewId});
}
@override
Future<void> setWebviewWindowVisibility(bool visible) {
return channel.invokeMethod("setWebviewWindowVisibility", {
"viewId": viewId,
"visible": visible,
});
}
@override
Future<void> moveWebviewWindow(int left, int top, int width, int height) {
return channel.invokeMethod("moveWebviewWindow", {
"viewId": viewId,
"left": left,
"top": top,
"width": width,
"height": height,
});
}
@override
Future<void> bringToForeground({bool maximized = false}) {
return channel.invokeMethod("bringToForeground", {
"viewId": viewId,
"maximized": maximized,
});
}
@override
Future<void> back() {
return channel.invokeMethod("back", {"viewId": viewId});
}
@override
Future<void> reload() {
return channel.invokeMethod("reload", {"viewId": viewId});
}
@override
Future<void> stop() {
return channel.invokeMethod("stop", {"viewId": viewId});
}
@override
Future<void> openDevToolsWindow() {
return channel.invokeMethod('openDevToolsWindow', {"viewId": viewId});
}
@override
void setOnHistoryChangedCallback(OnHistoryChangedCallback? callback) {
_onHistoryChanged = callback;
}
@override
void setOnUrlRequestCallback(OnUrlRequestCallback? callback) {
_onUrlRequestCallback = callback;
}
@override
void addOnWebMessageReceivedCallback(OnWebMessageReceivedCallback callback) {
_onWebMessageReceivedCallbacks.add(callback);
}
@override
void removeOnWebMessageReceivedCallback(OnWebMessageReceivedCallback callback) {
_onWebMessageReceivedCallbacks.remove(callback);
}
@override
void close() {
if (_closed) {
return;
}
channel.invokeMethod("close", {"viewId": viewId});
}
@override
Future<String?> evaluateJavaScript(String javaScript) async {
final dynamic result = await channel.invokeMethod("evaluateJavaScript", {
"viewId": viewId,
"javaScriptString": javaScript,
});
if (result is String || result == null) {
return result;
}
return json.encode(result);
}
@override
Future<void> postWebMessageAsString(String webMessage) async {
return channel.invokeMethod("postWebMessageAsString", {
"viewId": viewId,
"webMessage": webMessage,
});
}
@override
Future<void> postWebMessageAsJson(String webMessage) async {
return channel.invokeMethod("postWebMessageAsJson", {
"viewId": viewId,
"webMessage": webMessage,
});
}
}