use netsurf's mousevent

Author: karlseguin

src/browser/browser.zig

@@ -431,14 +431,34 @@ pub const Page = struct {
         navigate: std.Uri,
     };
 
-    pub fn click(self: *Page, allocator: Allocator, x: u32, y: u32) !?ClickResult {
-        const element = self.renderer.getElementAtPosition(x, y) orelse return null;
+    pub const MouseEvent = struct {
+        x: i32,
+        y: i32,
+        type: Type,
+
+        const Type = enum {
+            pressed,
+            released,
+        };
+    };
 
-        const event = try parser.eventCreate();
-        defer parser.eventDestroy(event);
+    pub fn mouseEvent(self: *Page, allocator: Allocator, me: MouseEvent) !?ClickResult {
+        if (me.type != .pressed) {
+            return null;
+        }
 
-        try parser.eventInit(event, "click", .{ .bubbles = true, .cancelable = true });
-        if ((try parser.eventDefaultPrevented(event)) == true) {
+        const element = self.renderer.getElementAtPosition(me.x, me.y) orelse return null;
+
+        const event = try parser.mouseEventCreate();
+        defer parser.mouseEventDestroy(event);
+
+        try parser.mouseEventInit(event, "click", .{
+            .bubbles = true,
+            .cancelable = true,
+            .x = me.x,
+            .y = me.y,
+        });
+        if ((try parser.mouseEventDefaultPrevented(event)) == true) {
             return null;
         }
 
@@ -838,13 +858,13 @@ const FlatRenderer = struct {
         return 1;
     }
 
-    pub fn getElementAtPosition(self: *const FlatRenderer, x: u32, y: u32) ?*parser.Element {
-        if (y > 1) {
+    pub fn getElementAtPosition(self: *const FlatRenderer, x: i32, y: i32) ?*parser.Element {
+        if (y != 1 or x < 0) {
             return null;
         }
 
         const elements = self.elements.items;
-        return if (x < elements.len) @ptrFromInt(elements[x]) else null;
+        return if (x < elements.len) @ptrFromInt(elements[@intCast(x)]) else null;
     }
 };
 

src/cdp/domains/input.zig

@@ -17,6 +17,7 @@
 // along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
 const std = @import("std");
+const Page = @import("../../browser/browser.zig").Page;
 
 pub fn processMessage(cmd: anytype) !void {
     const action = std.meta.stringToEnum(enum {
@@ -31,20 +32,39 @@ pub fn processMessage(cmd: anytype) !void {
 // https://chromedevtools.github.io/devtools-protocol/tot/Input/#method-dispatchMouseEvent
 fn dispatchMouseEvent(cmd: anytype) !void {
     const params = (try cmd.params(struct {
-        type: []const u8,
-        x: u32,
-        y: u32,
+        x: i32,
+        y: i32,
+        type: Type,
+
+        const Type = enum {
+            mousePressed,
+            mouseReleased,
+            mouseMoved,
+            mouseWheel,
+        };
     })) orelse return error.InvalidParams;
 
     try cmd.sendResult(null, .{});
 
-    if (std.ascii.eqlIgnoreCase(params.type, "mousePressed") == false) {
-        return;
+    // quickly ignore types we know we don't handle
+    switch (params.type) {
+        .mouseMoved, .mouseWheel => return,
+        else => {},
     }
 
     const bc = cmd.browser_context orelse return;
     const page = bc.session.currentPage() orelse return;
-    const click_result = (try page.click(cmd.arena, params.x, params.y)) orelse return;
+
+    const mouse_event = Page.MouseEvent{
+        .x = params.x,
+        .y = params.y,
+        .type = switch (params.type) {
+            .mousePressed => .pressed,
+            .mouseReleased => .released,
+            else => unreachable,
+        },
+    };
+    const click_result = (try page.mouseEvent(cmd.arena, mouse_event)) orelse return;
 
     switch (click_result) {
         .navigate => |uri| try clickNavigate(cmd, uri),

src/netsurf/netsurf.zig

@@ -24,6 +24,7 @@ const c = @cImport({
     @cInclude("dom/bindings/hubbub/parser.h");
     @cInclude("events/event_target.h");
     @cInclude("events/event.h");
+    @cInclude("events/mouse_event.h");
 });
 
 const mimalloc = @import("mimalloc");
@@ -809,14 +810,10 @@ const DispatchOpts = struct {
 pub fn elementDispatchEvent(element: *Element, opts: DispatchOpts) !bool {
     const event = try eventCreate();
     defer eventDestroy(event);
-
     try eventInit(event, opts.type, .{ .bubbles = opts.bubbles, .cancelable = opts.cancelable });
 
-    var res: bool = undefined;
     const et: *EventTarget = @ptrCast(element);
-    const err = eventTargetVtable(et).dispatch_event.?(et, event, &res);
-    try DOMErr(err);
-    return res;
+    return eventTargetDispatchEvent(et, event);
 }
 
 pub fn eventTargetTBaseFieldName(comptime T: type) ?[]const u8 {
@@ -878,6 +875,61 @@ pub const EventTargetTBase = extern struct {
     }
 };
 
+// MouseEvent
+
+pub const MouseEvent = c.dom_mouse_event;
+
+pub fn mouseEventCreate() !*MouseEvent {
+    var evt: ?*MouseEvent = undefined;
+    const err = c._dom_mouse_event_create(&evt);
+    try DOMErr(err);
+    return evt.?;
+}
+
+pub fn mouseEventDestroy(evt: *MouseEvent) void {
+    c._dom_mouse_event_destroy(evt);
+}
+
+const MouseEventOpts = struct {
+    x: i32,
+    y: i32,
+    bubbles: bool = false,
+    cancelable: bool = false,
+    ctrl: bool = false,
+    alt: bool = false,
+    shift: bool = false,
+    meta: bool = false,
+    button: u16 = 0,
+    click_count: u16 = 1,
+};
+
+pub fn mouseEventInit(evt: *MouseEvent, typ: []const u8, opts: MouseEventOpts) !void {
+    const s = try strFromData(typ);
+    const err = c._dom_mouse_event_init(
+        evt,
+        s,
+        opts.bubbles,
+        opts.cancelable,
+        null, // dom_abstract_view* ?
+        opts.click_count, // details
+        opts.x, // screen_x
+        opts.y, // screen_y
+        opts.x, // client_x
+        opts.y, // client_y
+        opts.ctrl,
+        opts.alt,
+        opts.shift,
+        opts.meta,
+        opts.button,
+        null, // related target
+    );
+    try DOMErr(err);
+}
+
+pub fn mouseEventDefaultPrevented(evt: *MouseEvent) !bool {
+    return eventDefaultPrevented(@ptrCast(evt));
+}
+
 // NodeType
 
 pub const NodeType = enum(u4) {