413 lines
14 KiB
C#
413 lines
14 KiB
C#
using System;
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using Microsoft.Maui.Platform.Linux.Native;
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using Microsoft.Maui.Platform.Linux.Services;
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namespace Microsoft.Maui.Platform.Linux.Handlers;
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/// <summary>
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/// Type of JavaScript dialog.
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/// </summary>
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public enum ScriptDialogType
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{
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Alert = 0,
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Confirm = 1,
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Prompt = 2,
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BeforeUnloadConfirm = 3
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}
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/// <summary>
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/// GTK-based WebView platform view using WebKitGTK.
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/// Provides web browsing capabilities within MAUI applications.
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/// </summary>
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public sealed class GtkWebViewPlatformView : IDisposable
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{
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private IntPtr _widget;
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private bool _disposed;
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private string? _currentUri;
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private ulong _loadChangedSignalId;
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private ulong _scriptDialogSignalId;
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private WebKitNative.LoadChangedCallback? _loadChangedCallback;
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private WebKitNative.ScriptDialogCallback? _scriptDialogCallback;
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private EventHandler<Microsoft.Maui.Controls.AppThemeChangedEventArgs>? _themeChangedHandler;
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public IntPtr Widget => _widget;
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public string? CurrentUri => _currentUri;
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public event EventHandler<string>? NavigationStarted;
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public event EventHandler<(string Url, bool Success)>? NavigationCompleted;
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public event EventHandler<string>? TitleChanged;
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public event EventHandler<(ScriptDialogType Type, string Message, Action<bool> Callback)>? ScriptDialogRequested;
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public GtkWebViewPlatformView()
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{
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if (!WebKitNative.Initialize())
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{
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throw new InvalidOperationException("Failed to initialize WebKitGTK. Is libwebkit2gtk-4.x installed?");
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}
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_widget = WebKitNative.WebViewNew();
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if (_widget == IntPtr.Zero)
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{
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throw new InvalidOperationException("Failed to create WebKitWebView widget");
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}
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WebKitNative.ConfigureSettings(_widget);
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_loadChangedCallback = OnLoadChanged;
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_loadChangedSignalId = WebKitNative.ConnectLoadChanged(_widget, _loadChangedCallback);
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// Connect to script-dialog signal to intercept JavaScript alerts/confirms/prompts
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_scriptDialogCallback = OnScriptDialog;
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_scriptDialogSignalId = WebKitNative.ConnectScriptDialog(_widget, _scriptDialogCallback);
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// Set initial background color based on theme
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UpdateBackgroundForTheme();
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// Subscribe to theme changes to update background color
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_themeChangedHandler = (sender, args) =>
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{
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GLibNative.IdleAdd(() =>
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{
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UpdateBackgroundForTheme();
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return false;
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});
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};
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if (Microsoft.Maui.Controls.Application.Current != null)
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{
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Microsoft.Maui.Controls.Application.Current.RequestedThemeChanged += _themeChangedHandler;
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}
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Console.WriteLine("[GtkWebViewPlatformView] Created WebKitWebView widget");
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}
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/// <summary>
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/// Updates the WebView background color based on the current app theme.
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/// </summary>
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public void UpdateBackgroundForTheme()
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{
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if (_widget == IntPtr.Zero) return;
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var isDark = Microsoft.Maui.Controls.Application.Current?.RequestedTheme == Microsoft.Maui.ApplicationModel.AppTheme.Dark;
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if (isDark)
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{
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// Dark theme: use a dark gray background
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WebKitNative.SetBackgroundColor(_widget, 0.12, 0.12, 0.12, 1.0); // #1E1E1E
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}
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else
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{
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// Light theme: use white background
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WebKitNative.SetBackgroundColor(_widget, 1.0, 1.0, 1.0, 1.0);
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}
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}
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private bool OnScriptDialog(IntPtr webView, IntPtr dialog, IntPtr userData)
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{
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try
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{
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var webkitDialogType = WebKitNative.GetScriptDialogType(dialog);
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var dialogType = (ScriptDialogType)(int)webkitDialogType;
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var message = WebKitNative.GetScriptDialogMessage(dialog) ?? "";
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Console.WriteLine($"[GtkWebViewPlatformView] Script dialog: type={dialogType}, message={message}");
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// Get the parent window for proper modal behavior
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IntPtr parentWindow = GtkHostService.Instance.HostWindow?.Window ?? IntPtr.Zero;
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// Handle prompt dialogs specially - they need a text entry
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if (dialogType == ScriptDialogType.Prompt)
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{
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return HandlePromptDialog(dialog, message, parentWindow);
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}
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// Determine dialog type and buttons based on JavaScript dialog type
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int messageType = GtkNative.GTK_MESSAGE_INFO;
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int buttons = GtkNative.GTK_BUTTONS_OK;
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switch (dialogType)
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{
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case ScriptDialogType.Alert:
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messageType = GtkNative.GTK_MESSAGE_INFO;
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buttons = GtkNative.GTK_BUTTONS_OK;
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break;
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case ScriptDialogType.Confirm:
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case ScriptDialogType.BeforeUnloadConfirm:
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messageType = GtkNative.GTK_MESSAGE_QUESTION;
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buttons = GtkNative.GTK_BUTTONS_OK_CANCEL;
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break;
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}
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// Create and show native GTK message dialog
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IntPtr gtkDialog = GtkNative.gtk_message_dialog_new(
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parentWindow,
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GtkNative.GTK_DIALOG_MODAL | GtkNative.GTK_DIALOG_DESTROY_WITH_PARENT,
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messageType,
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buttons,
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message,
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IntPtr.Zero);
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if (gtkDialog != IntPtr.Zero)
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{
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// Set dialog title based on type
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string title = dialogType switch
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{
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ScriptDialogType.Alert => "Alert",
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ScriptDialogType.Confirm => "Confirm",
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ScriptDialogType.BeforeUnloadConfirm => "Leave Page?",
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_ => "Message"
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};
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GtkNative.gtk_window_set_title(gtkDialog, title);
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// Make dialog modal to parent if we have a parent
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if (parentWindow != IntPtr.Zero)
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{
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GtkNative.gtk_window_set_transient_for(gtkDialog, parentWindow);
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GtkNative.gtk_window_set_modal(gtkDialog, true);
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}
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// Run the dialog synchronously - this blocks until user responds
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int response = GtkNative.gtk_dialog_run(gtkDialog);
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Console.WriteLine($"[GtkWebViewPlatformView] Dialog response: {response}");
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// Set the confirmed state for confirm dialogs
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if (dialogType == ScriptDialogType.Confirm || dialogType == ScriptDialogType.BeforeUnloadConfirm)
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{
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bool confirmed = response == GtkNative.GTK_RESPONSE_OK || response == GtkNative.GTK_RESPONSE_YES;
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WebKitNative.SetScriptDialogConfirmed(dialog, confirmed);
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}
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// Clean up
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GtkNative.gtk_widget_destroy(gtkDialog);
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}
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// Return true to indicate we handled the dialog (prevents WebKitGTK's default)
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return true;
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}
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catch (Exception ex)
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{
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Console.WriteLine($"[GtkWebViewPlatformView] Error in OnScriptDialog: {ex.Message}");
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// Return false on error to let WebKitGTK try its default handling
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return false;
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}
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}
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private bool HandlePromptDialog(IntPtr webkitDialog, string message, IntPtr parentWindow)
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{
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try
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{
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// Get the default text for the prompt
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string? defaultText = WebKitNative.GetScriptDialogPromptDefaultText(webkitDialog) ?? "";
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// Create a custom dialog with OK/Cancel buttons
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IntPtr gtkDialog = GtkNative.gtk_dialog_new_with_buttons(
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"Prompt",
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parentWindow,
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GtkNative.GTK_DIALOG_MODAL | GtkNative.GTK_DIALOG_DESTROY_WITH_PARENT,
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"_Cancel",
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GtkNative.GTK_RESPONSE_CANCEL,
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"_OK",
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GtkNative.GTK_RESPONSE_OK,
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IntPtr.Zero);
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if (gtkDialog == IntPtr.Zero)
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{
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Console.WriteLine("[GtkWebViewPlatformView] Failed to create prompt dialog");
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return false;
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}
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// Get the content area
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IntPtr contentArea = GtkNative.gtk_dialog_get_content_area(gtkDialog);
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// Create a vertical box for the content
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IntPtr vbox = GtkNative.gtk_box_new(GtkNative.GTK_ORIENTATION_VERTICAL, 10);
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GtkNative.gtk_widget_set_margin_start(vbox, 12);
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GtkNative.gtk_widget_set_margin_end(vbox, 12);
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GtkNative.gtk_widget_set_margin_top(vbox, 12);
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GtkNative.gtk_widget_set_margin_bottom(vbox, 12);
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// Add the message label
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IntPtr label = GtkNative.gtk_label_new(message);
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GtkNative.gtk_box_pack_start(vbox, label, false, false, 0);
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// Add the text entry
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IntPtr entry = GtkNative.gtk_entry_new();
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GtkNative.gtk_entry_set_text(entry, defaultText);
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GtkNative.gtk_box_pack_start(vbox, entry, false, false, 0);
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// Add the vbox to content area
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GtkNative.gtk_box_pack_start(contentArea, vbox, true, true, 0);
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// Make dialog modal
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if (parentWindow != IntPtr.Zero)
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{
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GtkNative.gtk_window_set_transient_for(gtkDialog, parentWindow);
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GtkNative.gtk_window_set_modal(gtkDialog, true);
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}
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// Show all widgets
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GtkNative.gtk_widget_show_all(gtkDialog);
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// Run the dialog
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int response = GtkNative.gtk_dialog_run(gtkDialog);
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Console.WriteLine($"[GtkWebViewPlatformView] Prompt dialog response: {response}");
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if (response == GtkNative.GTK_RESPONSE_OK)
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{
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// Get the text from the entry
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IntPtr textPtr = GtkNative.gtk_entry_get_text(entry);
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string? enteredText = textPtr != IntPtr.Zero
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? System.Runtime.InteropServices.Marshal.PtrToStringUTF8(textPtr)
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: "";
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Console.WriteLine($"[GtkWebViewPlatformView] Prompt text: {enteredText}");
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// Set the prompt response
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WebKitNative.SetScriptDialogPromptText(webkitDialog, enteredText ?? "");
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}
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else
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{
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// User cancelled - for prompts, not confirming means returning null
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// WebKit handles this by not calling prompt_set_text
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}
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// Clean up
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GtkNative.gtk_widget_destroy(gtkDialog);
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return true;
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}
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catch (Exception ex)
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{
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Console.WriteLine($"[GtkWebViewPlatformView] Error in HandlePromptDialog: {ex.Message}");
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return false;
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}
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}
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private void OnLoadChanged(IntPtr webView, int loadEvent, IntPtr userData)
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{
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try
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{
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string uri = WebKitNative.GetUri(webView) ?? _currentUri ?? "";
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switch ((WebKitNative.WebKitLoadEvent)loadEvent)
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{
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case WebKitNative.WebKitLoadEvent.Started:
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Console.WriteLine("[GtkWebViewPlatformView] Load started: " + uri);
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NavigationStarted?.Invoke(this, uri);
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break;
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case WebKitNative.WebKitLoadEvent.Finished:
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_currentUri = uri;
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Console.WriteLine("[GtkWebViewPlatformView] Load finished: " + uri);
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NavigationCompleted?.Invoke(this, (uri, true));
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break;
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case WebKitNative.WebKitLoadEvent.Committed:
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_currentUri = uri;
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Console.WriteLine("[GtkWebViewPlatformView] Load committed: " + uri);
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break;
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case WebKitNative.WebKitLoadEvent.Redirected:
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break;
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}
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}
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catch (Exception ex)
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{
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Console.WriteLine("[GtkWebViewPlatformView] Error in OnLoadChanged: " + ex.Message);
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Console.WriteLine("[GtkWebViewPlatformView] Stack trace: " + ex.StackTrace);
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}
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}
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public void Navigate(string uri)
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{
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if (_widget != IntPtr.Zero)
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{
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WebKitNative.LoadUri(_widget, uri);
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Console.WriteLine("[GtkWebViewPlatformView] Navigate to: " + uri);
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}
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}
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public void LoadHtml(string html, string? baseUri = null)
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{
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if (_widget != IntPtr.Zero)
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{
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WebKitNative.LoadHtml(_widget, html, baseUri);
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Console.WriteLine("[GtkWebViewPlatformView] Load HTML content");
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}
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}
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public void GoBack()
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{
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if (_widget != IntPtr.Zero)
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{
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WebKitNative.GoBack(_widget);
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}
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}
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public void GoForward()
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{
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if (_widget != IntPtr.Zero)
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{
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WebKitNative.GoForward(_widget);
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}
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}
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public bool CanGoBack()
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{
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return _widget != IntPtr.Zero && WebKitNative.CanGoBack(_widget);
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}
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public bool CanGoForward()
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{
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return _widget != IntPtr.Zero && WebKitNative.CanGoForward(_widget);
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}
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public void Reload()
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{
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if (_widget != IntPtr.Zero)
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{
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WebKitNative.Reload(_widget);
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}
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}
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public void Stop()
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{
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if (_widget != IntPtr.Zero)
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{
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WebKitNative.StopLoading(_widget);
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}
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}
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public string? GetTitle()
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{
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return _widget == IntPtr.Zero ? null : WebKitNative.GetTitle(_widget);
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}
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public string? GetUri()
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{
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return _widget == IntPtr.Zero ? null : WebKitNative.GetUri(_widget);
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}
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public void SetJavascriptEnabled(bool enabled)
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{
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if (_widget != IntPtr.Zero)
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{
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WebKitNative.SetJavascriptEnabled(_widget, enabled);
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}
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}
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public void Dispose()
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{
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if (!_disposed)
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{
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_disposed = true;
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// Unsubscribe from theme changes
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if (_themeChangedHandler != null && Microsoft.Maui.Controls.Application.Current != null)
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{
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Microsoft.Maui.Controls.Application.Current.RequestedThemeChanged -= _themeChangedHandler;
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_themeChangedHandler = null;
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}
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if (_widget != IntPtr.Zero)
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{
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WebKitNative.DisconnectLoadChanged(_widget);
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WebKitNative.DisconnectScriptDialog(_widget);
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}
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_widget = IntPtr.Zero;
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_loadChangedCallback = null;
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_scriptDialogCallback = null;
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}
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}
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}
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