Add ClickOptions.Offset (Optional)

- Add new Offset struct and replace BoxModelPoint usage for ClickablePointAsync
- Add new Test case based on JSHandle.click should work
- Add JSHandle.clickablePoint tests

lib/PuppeteerSharp.Tests/JSHandleTests/ClickTests.cs

@@ -0,0 +1,53 @@
+using System.Collections.Generic;
+using System.Threading.Tasks;
+using PuppeteerSharp.Tests.Attributes;
+using PuppeteerSharp.Xunit;
+using Xunit;
+using Xunit.Abstractions;
+
+namespace PuppeteerSharp.Tests.JSHandleTests
+{
+    [Collection(TestConstants.TestFixtureCollectionName)]
+    public class ClickTests : PuppeteerPageBaseTest
+    {
+        public ClickTests(ITestOutputHelper output) : base(output)
+        {
+        }
+
+        [PuppeteerTest("jshandle.spec.ts", "JSHandle.click", "should work")]
+        [SkipBrowserFact(skipFirefox: true)]
+        public async Task ShouldWork()
+        {
+            var clicks = new List<BoxModelPoint>();
+
+            await Page.ExposeFunctionAsync("reportClick", (int x, int y) =>
+            {
+                clicks.Add(new BoxModelPoint { X = x, Y = y });
+
+                return true;
+            });
+
+            await Page.EvaluateExpressionAsync(@"document.body.style.padding = '0';
+                document.body.style.margin = '0';
+                document.body.innerHTML = '<div style=""cursor: pointer; width: 120px; height: 60px; margin: 30px; padding: 15px;""></div>';
+                document.body.addEventListener('click', e => {
+                    window.reportClick(e.clientX, e.clientY);
+                });");
+
+            var divHandle = await Page.QuerySelectorAsync("div");
+
+            await divHandle.ClickAsync();
+            await divHandle.ClickAsync(new Input.ClickOptions { OffSet = new Offset(10, 15) });
+
+            await TestUtils.ShortWaitForCollectionToHaveAtLeastNElementsAsync(clicks, 2);
+
+            // margin + middle point offset
+            Assert.Equal(clicks[0].X, 45 + 60);
+            Assert.Equal(clicks[0].Y, 45 + 30);
+
+            // margin + offset
+            Assert.Equal(clicks[1].X, 30 + 10);
+            Assert.Equal(clicks[1].Y, 30 + 15);
+        }
+    }
+}

lib/PuppeteerSharp.Tests/JSHandleTests/ClickablePointTests.cs

@@ -0,0 +1,74 @@
+using System.Collections.Generic;
+using System.Linq;
+using System.Reflection;
+using System.Security.Policy;
+using System.Threading.Tasks;
+using PuppeteerSharp.Tests.Attributes;
+using PuppeteerSharp.Xunit;
+using Xunit;
+using Xunit.Abstractions;
+
+namespace PuppeteerSharp.Tests.JSHandleTests
+{
+    [Collection(TestConstants.TestFixtureCollectionName)]
+    public class ClickablePointTests : PuppeteerPageBaseTest
+    {
+        public ClickablePointTests(ITestOutputHelper output) : base(output)
+        {
+        }
+
+        [PuppeteerTest("jshandle.spec.ts", "JSHandle.clickablePoint", "should work")]
+        [PuppeteerFact]
+        public async Task ShouldWork()
+        {
+            await Page.EvaluateExpressionAsync(@"document.body.style.padding = '0';
+                document.body.style.margin = '0';
+                document.body.innerHTML = '<div style=""cursor: pointer; width: 120px; height: 60px; margin: 30px; padding: 15px;""></div>';
+                ");
+
+            await Page.EvaluateExpressionAsync("new Promise(resolve => requestAnimationFrame(() => requestAnimationFrame(resolve)));");
+
+            var divHandle = await Page.QuerySelectorAsync("div");
+
+            var clickablePoint = await divHandle.ClickablePointAsync();
+
+            // margin + middle point offset
+            Assert.Equal(45 + 60, clickablePoint.X);
+            Assert.Equal(45 + 30, clickablePoint.Y);
+
+            clickablePoint = await divHandle.ClickablePointAsync(new Offset { X = 10, Y = 15 });
+
+            // margin + offset
+            Assert.Equal(30 + 10, clickablePoint.X);
+            Assert.Equal(30 + 15, clickablePoint.Y);
+        }
+
+        [PuppeteerTest("jshandle.spec.ts", "JSHandle.clickablePoint", "should work for iframes")]
+        [PuppeteerFact]
+        public async Task ShouldWorkForIFrames()
+        {
+            await Page.EvaluateExpressionAsync(@"document.body.style.padding = '10px';
+                document.body.style.margin = '10px';
+                document.body.innerHTML = `<iframe style=""border: none; margin: 0; padding: 0;"" seamless sandbox srcdoc=""<style>* { margin: 0; padding: 0;}</style><div style='cursor: pointer; width: 120px; height: 60px; margin: 30px; padding: 15px;' />""></iframe>`
+                ");
+
+            await Page.EvaluateExpressionAsync("new Promise(resolve => requestAnimationFrame(() => requestAnimationFrame(resolve)));");
+
+            var frame = Page.FirstChildFrame();
+
+            var divHandle = await frame.QuerySelectorAsync("div");
+
+            var clickablePoint = await divHandle.ClickablePointAsync();
+
+            // iframe pos + margin + middle point offset
+            Assert.Equal(20 + 45 + 60, clickablePoint.X);
+            Assert.Equal(20 + 45 + 30, clickablePoint.Y);
+
+            clickablePoint = await divHandle.ClickablePointAsync(new Offset { X = 10, Y = 15 });
+
+            // iframe pos + margin + offset
+            Assert.Equal(20 + 30 + 10, clickablePoint.X);
+            Assert.Equal(20 + 30 + 15, clickablePoint.Y);
+        }
+    }
+}

lib/PuppeteerSharp.Tests/TestUtils.cs

@@ -1,3 +1,4 @@
+using System.Collections;
 using System.IO;
 using System.Text;
 using System.Threading.Tasks;
@@ -6,6 +7,18 @@ namespace PuppeteerSharp.Tests
 {
     public static class TestUtils
     {
+        public static async Task ShortWaitForCollectionToHaveAtLeastNElementsAsync(ICollection collection, int minLength, int attempts = 3, int timeout = 50)
+        {
+            for (var i = 0; i < attempts; i++)
+            {
+                if (collection.Count >= minLength)
+                {
+                    break;
+                }
+                await Task.Delay(timeout);
+            }
+        }
+
         public static string FindParentDirectory(string directory)
         {
             var current = Directory.GetCurrentDirectory();

lib/PuppeteerSharp/ElementHandle.cs

@@ -179,7 +179,7 @@ public async Task HoverAsync()
         public async Task ClickAsync(ClickOptions options = null)
         {
             await ScrollIntoViewIfNeededAsync().ConfigureAwait(false);
-            var clickablePoint = await ClickablePointAsync().ConfigureAwait(false);
+            var clickablePoint = await ClickablePointAsync(options?.OffSet).ConfigureAwait(false);
             await Page.Mouse.ClickAsync(clickablePoint.X, clickablePoint.Y, options).ConfigureAwait(false);
         }
 
@@ -469,7 +469,7 @@ public async Task DragAndDropAsync(IElementHandle target, int delay = 0)
         }
 
         /// <inheritdoc/>
-        public async Task<BoxModelPoint> ClickablePointAsync(BoxModelPoint? offset = null)
+        public async Task<BoxModelPoint> ClickablePointAsync(Offset? offset = null)
         {
             GetContentQuadsResponse result = null;
 

lib/PuppeteerSharp/IElementHandle.cs

@@ -30,7 +30,7 @@ public interface IElementHandle : IJSHandle
         /// <param name="offset">Optional offset</param>
         /// <exception cref="PuppeteerException">When the node is not visible or not an HTMLElement</exception>
         /// <returns>A <see cref="Task"/> that resolves to the clickable point</returns>
-        public Task<BoxModelPoint> ClickablePointAsync(BoxModelPoint? offset = null);
+        public Task<BoxModelPoint> ClickablePointAsync(Offset? offset = null);
 
         /// <summary>
         /// Scrolls element into view if needed, and then uses <see cref="PuppeteerSharp.IPage.Mouse"/> to click in the center of the element.

lib/PuppeteerSharp/Input/ClickOptions.cs

@@ -19,5 +19,10 @@ public class ClickOptions
         /// The button to use for the click. Defaults to <see cref="MouseButton.Left"/>
         /// </summary>
         public MouseButton Button { get; set; } = MouseButton.Left;
+
+        /// <summary>
+        /// Offset for the clickable point relative to the top-left corner of the border-box.
+        /// </summary>
+        public Offset? OffSet { get; set; }
     }
 }

lib/PuppeteerSharp/Offset.cs

@@ -0,0 +1,29 @@
+namespace PuppeteerSharp
+{
+    /// <summary>
+    /// Offset used in conjunction with <see cref="ElementHandle.ClickablePointAsync(Offset?)"/>
+    /// </summary>
+    public struct Offset
+    {
+        /// <summary>
+        /// Initializes a new instance of the <see cref="Offset"/> struct.
+        /// </summary>
+        /// <param name="x">x-offset for the clickable point relative to the top-left corner of the border box.</param>
+        /// <param name="y">y-offset for the clickable point relative to the top-left corner of the border box.</param>
+        public Offset(decimal x, decimal y)
+        {
+            X = x;
+            Y = y;
+        }
+
+        /// <summary>
+        /// x-offset for the clickable point relative to the top-left corner of the border box.
+        /// </summary>
+        public decimal X { get; set; }
+
+        /// <summary>
+        /// y-offset for the clickable point relative to the top-left corner of the border box.
+        /// </summary>
+        public decimal Y { get; set; }
+    }
+}