add selection api to HTMLInputElement

src/browser/Page.zig

@@ -2933,16 +2933,7 @@ pub fn handleKeydown(self: *Page, target: *Node, event: *Event) !void {
 
         // Handle printable characters
         if (key.isPrintable()) {
-            // if the input is selected, replace the content.
-            if (input._selected) {
-                const new_value = try self.arena.dupe(u8, key.asString());
-                try input.setValue(new_value, self);
-                input._selected = false;
-                return;
-            }
-            const current_value = input.getValue();
-            const new_value = try std.mem.concat(self.arena, u8, &.{ current_value, key.asString() });
-            try input.setValue(new_value, self);
+            try input.innerInsert(key.asString(), self);
         }
         return;
     }
@@ -3011,18 +3002,7 @@ pub fn insertText(self: *Page, v: []const u8) !void {
             return;
         }
 
-        // If the input is selected, replace the existing value
-        if (input._selected) {
-            const new_value = try self.arena.dupe(u8, v);
-            try input.setValue(new_value, self);
-            input._selected = false;
-            return;
-        }
-
-        // Or append the value
-        const current_value = input.getValue();
-        const new_value = try std.mem.concat(self.arena, u8, &.{ current_value, v });
-        return input.setValue(new_value, self);
+        try input.innerInsert(v, self);
     }
 
     if (html_element.is(Element.Html.TextArea)) |textarea| {

src/browser/webapi/Selection.zig

@@ -28,7 +28,7 @@ const Node = @import("Node.zig");
 /// https://w3c.github.io/selection-api/
 const Selection = @This();
 
-const SelectionDirection = enum { backward, forward, none };
+pub const SelectionDirection = enum { backward, forward, none };
 
 _range: ?*Range = null,
 _direction: SelectionDirection = .none,

src/browser/webapi/element/html/Input.zig

@@ -24,6 +24,7 @@ const Node = @import("../../Node.zig");
 const Element = @import("../../Element.zig");
 const HtmlElement = @import("../Html.zig");
 const Form = @import("Form.zig");
+const Selection = @import("../../Selection.zig");
 
 const Input = @This();
 
@@ -74,9 +75,12 @@ _value: ?[]const u8 = null,
 _checked: bool = false,
 _checked_dirty: bool = false,
 _input_type: Type = .text,
-_selected: bool = false,
 _indeterminate: bool = false,
 
+_selection_start: u32 = 0,
+_selection_end: u32 = 0,
+_selection_direction: Selection.SelectionDirection = .none,
+
 pub fn asElement(self: *Input) *Element {
     return self._proto._proto;
 }
@@ -255,8 +259,120 @@ pub fn setRequired(self: *Input, required: bool, page: *Page) !void {
     }
 }
 
-pub fn select(self: *Input) void {
-    self._selected = true;
+pub fn select(self: *Input) !void {
+    const len = if (self._value) |v| @as(u32, @intCast(v.len)) else 0;
+    try self.setSelectionRange(0, len, null);
+}
+
+fn selectionAvailable(self: *const Input) bool {
+    switch (self._input_type) {
+        .text, .search, .url, .tel, .password => return true,
+        else => return false,
+    }
+}
+
+const HowSelected = union(enum) { partial: struct { u32, u32 }, full, none };
+
+fn howSelected(self: *const Input) HowSelected {
+    if (!self.selectionAvailable()) return .none;
+    const value = self._value orelse return .none;
+
+    if (self._selection_start == self._selection_end) return .none;
+    if (self._selection_start == 0 and self._selection_end == value.len) return .full;
+    return .{ .partial = .{ self._selection_start, self._selection_end } };
+}
+
+pub fn innerInsert(self: *Input, str: []const u8, page: *Page) !void {
+    const arena = page.arena;
+
+    switch (self.howSelected()) {
+        .full => {
+            // if the input is fully selected, replace the content.
+            const new_value = try arena.dupe(u8, str);
+            try self.setValue(new_value, page);
+            self._selection_start = 1;
+            self._selection_end = 1;
+            self._selection_direction = .none;
+        },
+        .partial => |range| {
+            // if the input is partially selected, replace the selected content.
+            const current_value = self.getValue();
+            const before = current_value[0..range[0]];
+            const remaining = current_value[range[1]..];
+
+            const new_value = try std.mem.concat(
+                arena,
+                u8,
+                &.{ before, str, remaining },
+            );
+            try self.setValue(new_value, page);
+
+            const new_pos = range[0] + str.len;
+            self._selection_start = @intCast(new_pos);
+            self._selection_end = @intCast(new_pos);
+            self._selection_direction = .none;
+        },
+        .none => {
+            // if the input is not selected, just insert at cursor.
+            const current_value = self.getValue();
+            const new_value = try std.mem.concat(arena, u8, &.{ current_value, str });
+            try self.setValue(new_value, page);
+        },
+    }
+}
+
+pub fn getSelectionDirection(self: *const Input) []const u8 {
+    return @tagName(self._selection_direction);
+}
+
+pub fn getSelectionStart(self: *const Input) !?u32 {
+    if (!self.selectionAvailable()) return null;
+    return self._selection_start;
+}
+
+pub fn setSelectionStart(self: *Input, value: u32) !void {
+    if (!self.selectionAvailable()) return error.InvalidStateError;
+    self._selection_start = value;
+}
+
+pub fn getSelectionEnd(self: *const Input) !?u32 {
+    if (!self.selectionAvailable()) return null;
+    return self._selection_end;
+}
+
+pub fn setSelectionEnd(self: *Input, value: u32) !void {
+    if (!self.selectionAvailable()) return error.InvalidStateError;
+    self._selection_end = value;
+}
+
+pub fn setSelectionRange(self: *Input, selection_start: u32, selection_end: u32, selection_dir: ?[]const u8) !void {
+    if (!self.selectionAvailable()) return error.InvalidStateError;
+
+    const direction = blk: {
+        if (selection_dir) |sd| {
+            break :blk std.meta.stringToEnum(Selection.SelectionDirection, sd) orelse .none;
+        } else break :blk .none;
+    };
+
+    const value = self._value orelse {
+        self._selection_start = 0;
+        self._selection_end = 0;
+        self._selection_direction = .none;
+        return;
+    };
+
+    const len_u32: u32 = @intCast(value.len);
+    var start: u32 = if (selection_start > len_u32) len_u32 else selection_start;
+    const end: u32 = if (selection_end > len_u32) len_u32 else selection_end;
+
+    // If end is less than start, both are equal to end.
+    if (end < start) {
+        start = end;
+    }
+
+    self._selection_direction = direction;
+    self._selection_start = start;
+    self._selection_end = end;
 }
 
 pub fn getForm(self: *Input, page: *Page) ?*Form {
@@ -352,6 +468,11 @@ pub const JsApi = struct {
     pub const form = bridge.accessor(Input.getForm, null, .{});
     pub const indeterminate = bridge.accessor(Input.getIndeterminate, Input.setIndeterminate, .{});
     pub const select = bridge.function(Input.select, .{});
+
+    pub const selectionStart = bridge.accessor(Input.getSelectionStart, Input.setSelectionStart, .{});
+    pub const selectionEnd = bridge.accessor(Input.getSelectionEnd, Input.setSelectionEnd, .{});
+    pub const selectionDirection = bridge.accessor(Input.getSelectionDirection, null, .{});
+    pub const setSelectionRange = bridge.function(Input.setSelectionRange, .{ .dom_exception = true });
 };
 
 pub const Build = struct {
@@ -422,7 +543,9 @@ pub const Build = struct {
         clone._value = source._value;
         clone._checked = source._checked;
         clone._checked_dirty = source._checked_dirty;
-        clone._selected = source._selected;
+        clone._selection_direction = source._selection_direction;
+        clone._selection_start = source._selection_start;
+        clone._selection_end = source._selection_end;
         clone._indeterminate = source._indeterminate;
     }
 };