add direct event handlers

src/browser/events/event.zig

@@ -17,6 +17,7 @@
 // along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
 const std = @import("std");
+const js = @import("../js/js.zig");
 const Allocator = std.mem.Allocator;
 
 const log = @import("../../log.zig");
@@ -231,8 +232,6 @@ pub const EventHandler = struct {
     node: parser.EventNode,
     listener: *parser.EventListener,
 
-    const js = @import("../js/js.zig");
-
     pub const Listener = union(enum) {
         function: js.Function,
         object: js.Object,
@@ -404,6 +403,40 @@ const SignalCallback = struct {
     }
 };
 
+pub fn DirectEventHandler(
+    comptime TargetT: type,
+    target: *TargetT,
+    event_type: []const u8,
+    maybe_listener: ?EventHandler.Listener,
+    cb: *?js.Function,
+    page_arena: std.mem.Allocator,
+) !void {
+    const event_target = parser.toEventTarget(TargetT, target);
+
+    // Check if we have a listener set.
+    if (cb.*) |callback| {
+        const listener = try parser.eventTargetHasListener(event_target, event_type, false, callback.id);
+        std.debug.assert(listener != null);
+        try parser.eventTargetRemoveEventListener(event_target, event_type, listener.?, false);
+    }
+
+    if (maybe_listener) |listener| {
+        switch (listener) {
+            // If an object is given as listener, do nothing.
+            .object => {},
+            .function => |callback| {
+                _ = try EventHandler.register(page_arena, event_target, event_type, listener, null) orelse unreachable;
+                cb.* = callback;
+
+                return;
+            },
+        }
+    }
+
+    // Just unset the listener.
+    cb.* = null;
+}
+
 const testing = @import("../../testing.zig");
 test "Browser: Event" {
     try testing.htmlRunner("events/event.html");

src/browser/html/History.zig

@@ -177,5 +177,6 @@ pub const PopStateEvent = struct {
 
 const testing = @import("../../testing.zig");
 test "Browser: HTML.History" {
-    try testing.htmlRunner("html/history.html");
+    try testing.htmlRunner("html/history/history.html");
+    try testing.htmlRunner("html/history/history2.html");
 }

src/browser/html/Navigation.zig

@@ -23,6 +23,7 @@ const URL = @import("../../url.zig").URL;
 const js = @import("../js/js.zig");
 const Page = @import("../page.zig").Page;
 
+const DirectEventHandler = @import("../events/event.zig").DirectEventHandler;
 const EventTarget = @import("../dom/event_target.zig").EventTarget;
 const EventHandler = @import("../events/event.zig").EventHandler;
 
@@ -62,6 +63,8 @@ index: usize = 0,
 entries: std.ArrayListUnmanaged(*NavigationHistoryEntry) = .empty,
 next_entry_id: usize = 0,
 
+oncurrententrychange_callback: ?js.Function = null,
+
 // https://developer.mozilla.org/en-US/docs/Web/API/NavigationHistoryEntry
 const NavigationHistoryEntry = struct {
     pub const prototype = *EventTarget;
@@ -199,6 +202,16 @@ pub fn _forward(self: *Navigation, page: *Page) !NavigationReturn {
     return self.navigate(next_entry.url, .{ .traverse = new_index }, page);
 }
 
+/// Returns `oncurrententrychange_callback`.
+pub fn get_oncurrententrychange(self: *const Navigation) ?js.Function {
+    return self.oncurrententrychange_callback;
+}
+
+/// Sets `oncurrententrychange_callback`.
+pub fn set_oncurrententrychange(self: *Navigation, maybe_listener: ?EventHandler.Listener, page: *Page) !void {
+    try DirectEventHandler(Navigation, self, "currententrychange", maybe_listener, &self.oncurrententrychange_callback, page.arena);
+}
+
 // This is for after true navigation processing, where we need to ensure that our entries are up to date.
 // This is only really safe to run in the `pageDoneCallback` where we can guarantee that the URL and NavigationKind are correct.
 pub fn processNavigation(self: *Navigation, page: *Page) !void {
@@ -456,5 +469,5 @@ pub const NavigationCurrentEntryChangeEvent = struct {
 
 const testing = @import("../../testing.zig");
 test "Browser: Navigation" {
-    try testing.htmlRunner("html/navigation.html");
+    try testing.htmlRunner("html/navigation/navigation.html");
 }

src/browser/html/window.zig

@@ -44,6 +44,8 @@ const fetchFn = @import("../fetch/fetch.zig").fetch;
 const storage = @import("../storage/storage.zig");
 const ErrorEvent = @import("error_event.zig").ErrorEvent;
 
+const DirectEventHandler = @import("../events/event.zig").DirectEventHandler;
+
 // https://dom.spec.whatwg.org/#interface-window-extensions
 // https://html.spec.whatwg.org/multipage/nav-history-apis.html#window
 pub const Window = struct {
@@ -70,6 +72,7 @@ pub const Window = struct {
     scroll_x: u32 = 0,
     scroll_y: u32 = 0,
     onload_callback: ?js.Function = null,
+    onpopstate_callback: ?js.Function = null,
 
     pub fn create(target: ?[]const u8, navigator: ?Navigator) !Window {
         var fbs = std.io.fixedBufferStream("");
@@ -111,31 +114,17 @@ pub const Window = struct {
 
     /// Sets `onload_callback`.
     pub fn set_onload(self: *Window, maybe_listener: ?EventHandler.Listener, page: *Page) !void {
-        const event_target = parser.toEventTarget(Window, self);
-        const event_type = "load";
+        try DirectEventHandler(Window, self, "load", maybe_listener, &self.onload_callback, page.arena);
+    }
 
-        // Check if we have a listener set.
-        if (self.onload_callback) |callback| {
-            const listener = try parser.eventTargetHasListener(event_target, event_type, false, callback.id);
-            std.debug.assert(listener != null);
-            try parser.eventTargetRemoveEventListener(event_target, event_type, listener.?, false);
-        }
+    /// Returns `onpopstate_callback`.
+    pub fn get_onpopstate(self: *const Window) ?js.Function {
+        return self.onpopstate_callback;
+    }
 
-        if (maybe_listener) |listener| {
-            switch (listener) {
-                // If an object is given as listener, do nothing.
-                .object => {},
-                .function => |callback| {
-                    _ = try EventHandler.register(page.arena, event_target, event_type, listener, null) orelse unreachable;
-                    self.onload_callback = callback;
-
-                    return;
-                },
-            }
-        }
-
-        // Just unset the listener.
-        self.onload_callback = null;
+    /// Sets `onpopstate_callback`.
+    pub fn set_onpopstate(self: *Window, maybe_listener: ?EventHandler.Listener, page: *Page) !void {
+        try DirectEventHandler(Window, self, "popstate", maybe_listener, &self.onpopstate_callback, page.arena);
     }
 
     pub fn get_location(self: *Window) *Location {

src/tests/html/history/history.html

@@ -1,5 +1,5 @@
 <!DOCTYPE html>
-<script src="../testing.js"></script>
+<script src="../../testing.js"></script>
 
 <script id=history>
     testing.expectEqual('auto', history.scrollRestoration);
@@ -11,7 +11,7 @@
     testing.expectEqual('auto', history.scrollRestoration);
     testing.expectEqual(null, history.state)
 
-    history.pushState({ testInProgress: true }, null, 'http://127.0.0.1:9582/src/tests/html/history2.html');
+    history.pushState({ testInProgress: true }, null, 'http://127.0.0.1:9582/src/tests/html/history/history_after_nav.html');
     testing.expectEqual({ testInProgress: true }, history.state);
 
     history.pushState({ testInProgress: false }, null, 'http://127.0.0.1:9582/xhr/json');

src/tests/html/history/history2.html

@@ -0,0 +1,26 @@
+<!DOCTYPE html>
+<script src="../../testing.js"></script>
+
+<script id=history2>
+    history.pushState(
+      {"new": "field", testComplete: true },
+      null,
+      'http://127.0.0.1:9582/src/tests/html/history/history_after_nav.html'
+    );
+
+    let popstateEventFired = false;
+    let popstateEventState = null;
+
+    // uses the window event listener.
+    window.onpopstate = (event) => {
+        popstateEventFired = true;
+        popstateEventState = event.state;
+    };
+    
+    testing.eventually(() => {
+      testing.expectEqual(true, popstateEventFired);
+      testing.expectEqual(true, popstateEventState.testComplete);
+    })
+
+    history.back();
+</script>

src/tests/html/history/history_after_nav.html

@@ -1,5 +1,5 @@
 <!DOCTYPE html>
-<script src="../testing.js"></script>
+<script src="../../testing.js"></script>
 
 <script id=history2>
     testing.expectEqual(true, history.state && history.state.testInProgress);

src/tests/html/navigation/navigation.html

@@ -1,5 +1,5 @@
 <!DOCTYPE html>
-<script src="../testing.js"></script>
+<script src="../../testing.js"></script>
 
 <script id=navigation>
     testing.expectEqual('object', typeof navigation);
@@ -12,7 +12,7 @@
     const currentIndex = navigation.currentEntry.index;
 
     navigation.navigate(
-        'http://127.0.0.1:9582/src/tests/html/navigation2.html',
+        'http://127.0.0.1:9582/src/tests/html/navigation/navigation2.html',
         { state: { currentIndex: currentIndex, navTestInProgress: true } }
     );
 </script>

src/tests/html/navigation/navigation2.html

@@ -1,5 +1,5 @@
 <!DOCTYPE html>
-<script src="../testing.js"></script>
+<script src="../../testing.js"></script>
 
 <script id=navigation2>
     const state = navigation.currentEntry.getState();