c# - C# webbrowser - 触发右键单击

Question

我正在 Visual Studio 上编写一些代码，以便从网页中获取一些信息。现在我需要打开一个 html 元素的上下文菜单，我正在寻找类似的东西：

webbrowser.Navigate("javascript: document.getElementsByClassName('className')[1].rightclick();void(0);");

但不幸的是，我注意到 Javascript 中只存在 click() 函数。有什么解决方法吗？

谢谢你们！

Answer 1

你可以通过流动的步骤来做到这一点：

1. 获取web-browser control表单上的位置：

   Point controlLoc = this.PointToScreen(webBrowser1.Location);
   

2. 获取您HtmlElement在网络浏览器控件上的位置

   X= element.OffsetRectangle.Left;
   
   Y =element.OffsetRectangle.Top;
   

3. 总结您的职位：

   controlLoc.X = controlLoc.X + element.OffsetRectangle.Left;
   
   controlLoc.Y = controlLoc.Y + element.OffsetRectangle.Top;
   

4. 将鼠标位置设置为新位置：

   Cursor.Position = controlLoc;
   

5. 模拟鼠标右键：

   MouseSimulator.ClickRightMouseButton();
   

完整代码：

public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();

        }

        private void Form1_Load(object sender, EventArgs e)
        {

            webBrowser1.DocumentText = "<button class=\"mybtn\" type=\"submit\"> Right click";
            webBrowser1.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler(webBrowser1_DocumentCompleted);
        }

        void webBrowser1_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
        {
            foreach (HtmlElement element in webBrowser1.Document.GetElementsByTagName("button"))
            {
                if (element.GetAttribute("ClassName") == "mybtn")
                {
                    Point controlLoc = this.PointToScreen(webBrowser1.Location);
                    //Get Element Posation
                    controlLoc.X= controlLoc.X + element.OffsetRectangle.Left;
                    controlLoc.Y = controlLoc.Y + element.OffsetRectangle.Top;
                    Cursor.Position = controlLoc;
                    MouseSimulator.ClickRightMouseButton();
                }
            }
        }
    }

    public class MouseSimulator
    {
        [DllImport("user32.dll", SetLastError = true)]
        static extern uint SendInput(uint nInputs, ref INPUT pInputs, int cbSize);

        [StructLayout(LayoutKind.Sequential)]
        struct INPUT
        {
            public SendInputEventType type;
            public MouseKeybdhardwareInputUnion mkhi;
        }
        [StructLayout(LayoutKind.Explicit)]
        struct MouseKeybdhardwareInputUnion
        {
            [FieldOffset(0)]
            public MouseInputData mi;

            [FieldOffset(0)]
            public KEYBDINPUT ki;

            [FieldOffset(0)]
            public HARDWAREINPUT hi;
        }
        [StructLayout(LayoutKind.Sequential)]
        struct KEYBDINPUT
        {
            public ushort wVk;
            public ushort wScan;
            public uint dwFlags;
            public uint time;
            public IntPtr dwExtraInfo;
        }
        [StructLayout(LayoutKind.Sequential)]
        struct HARDWAREINPUT
        {
            public int uMsg;
            public short wParamL;
            public short wParamH;
        }
        struct MouseInputData
        {
            public int dx;
            public int dy;
            public uint mouseData;
            public MouseEventFlags dwFlags;
            public uint time;
            public IntPtr dwExtraInfo;
        }
        [Flags]
        enum MouseEventFlags : uint
        {
            MOUSEEVENTF_MOVE = 0x0001,
            MOUSEEVENTF_LEFTDOWN = 0x0002,
            MOUSEEVENTF_LEFTUP = 0x0004,
            MOUSEEVENTF_RIGHTDOWN = 0x0008,
            MOUSEEVENTF_RIGHTUP = 0x0010,
            MOUSEEVENTF_MIDDLEDOWN = 0x0020,
            MOUSEEVENTF_MIDDLEUP = 0x0040,
            MOUSEEVENTF_XDOWN = 0x0080,
            MOUSEEVENTF_XUP = 0x0100,
            MOUSEEVENTF_WHEEL = 0x0800,
            MOUSEEVENTF_VIRTUALDESK = 0x4000,
            MOUSEEVENTF_ABSOLUTE = 0x8000
        }
        enum SendInputEventType : int
        {
            InputMouse,
            InputKeyboard,
            InputHardware
        }

        public static void ClickRightMouseButton()
        {
            INPUT mouseDownInput = new INPUT();
            mouseDownInput.type = SendInputEventType.InputMouse;
            mouseDownInput.mkhi.mi.dwFlags = MouseEventFlags.MOUSEEVENTF_RIGHTDOWN;
            SendInput(1, ref mouseDownInput, Marshal.SizeOf(new INPUT()));

            INPUT mouseUpInput = new INPUT();
            mouseUpInput.type = SendInputEventType.InputMouse;
            mouseUpInput.mkhi.mi.dwFlags = MouseEventFlags.MOUSEEVENTF_RIGHTUP;
            SendInput(1, ref mouseUpInput, Marshal.SizeOf(new INPUT()));
        }
    }

结果：

Answer 2

您可以按照以下步骤

步骤1

创建一个新的 Windows 窗体应用程序并将一个TextBox和一个ContextMenuStrip控件拖到窗体上。将 TextBox 的 MultiLine 属性设置为 true，将 ContextMenuStrip 属性设置为 contextMenuStrip1，以覆盖 TextBox 的默认 ContextMenu（如下图所示）。看：

第2步

在 ContextMenuStrip 中添加六个菜单项，与 TextBox 控件的默认 ContextMenuStrip 一样，撤消、剪切、复制、粘贴、删除和“全选”，在撤消、删除和“全选”菜单项之后使用三个分隔符。在 ContextMenuStrip Font、Forecolor 和 Backcolor 中再添加三个菜单项，用于更改 TextBox 的字体、文本颜色和背景颜色。contextMenuStrip1 应如上图所示。添加上下文菜单可以参考我之前的文章。

将这些菜单项的 Name 属性设置为与其 Text 相同。就像菜单项“撤消”一样，将其名称设置为“撤消”。

第 3 步

在 contextMenuStrip1 的 Opening 事件中添加以下代码，根据特定条件禁用 ToolStripMenuItems（见注释）。看：

private void contextMenuStrip1_Opening(object sender, CancelEventArgs e)
{
    // Disable Undo if CanUndo property returns false
    if (textBox1.CanUndo)
    {
        contextMenuStrip1.Items["Undo"].Enabled = true;
    }
    else
    {
        contextMenuStrip1.Items["Undo"].Enabled = false;
    }


// Disable Cut, Copy and Delete if any text is not selected in TextBox
if (textBox1.SelectedText.Length == 0)
{
    contextMenuStrip1.Items["Cut"].Enabled = false;
    contextMenuStrip1.Items["Copy"].Enabled = false;
    contextMenuStrip1.Items["Delete"].Enabled = false;
}
else
{
    contextMenuStrip1.Items["Cut"].Enabled = true;
    contextMenuStrip1.Items["Copy"].Enabled = true;
    contextMenuStrip1.Items["Delete"].Enabled = true;
}

// Disable Paste if Clipboard does not contains text
if (Clipboard.ContainsText())
{
    contextMenuStrip1.Items["Paste"].Enabled = true;
}
else
{
    contextMenuStrip1.Items["Paste"].Enabled = false;
}

// Disable Select All if TextBox is blank
if (textBox1.Text.Length == 0)
{
    contextMenuStrip1.Items["SelectAll"].Enabled = false;
}
else
{
    contextMenuStrip1.Items["SelectAll"].Enabled = true;
}

}

第4步

在 ToolStripMenuItems 的点击事件中添加如下代码：

private void Undo_Click(object sender, EventArgs e)
{
    textBox1.Undo();
}

private void Cut_Click(object sender, EventArgs e)
{
    textBox1.Cut();
}

private void Copy_Click(object sender, EventArgs e)
{
    textBox1.Copy();
}

private void Paste_Click(object sender, EventArgs e)
{
    textBox1.Paste();
}

private void Delete_Click(object sender, EventArgs e)
{
    int SelectionIndex = textBox1.SelectionStart;
    int SelectionCount = textBox1.SelectionLength;
    textBox1.Text = textBox1.Text.Remove(SelectionIndex, SelectionCount);
    textBox1.SelectionStart = SelectionIndex;
}

private void SelectAll_Click(object sender, EventArgs e)
{
    textBox1.SelectAll();
}

private void Font_Click(object sender, EventArgs e)
{
    FontDialog fontDialog = new FontDialog();
    if (fontDialog.ShowDialog() == DialogResult.OK)
    {
        textBox1.Font = fontDialog.Font;
    }
}

private void Forecolor_Click(object sender, EventArgs e)
{
    ColorDialog colorDialog = new ColorDialog();
    if (colorDialog.ShowDialog() == DialogResult.OK)
    {
        textBox1.ForeColor = colorDialog.Color;
    }
}

private void Backcolor_Click(object sender, EventArgs e)
{
    ColorDialog colorDialog = new ColorDialog();
    if (colorDialog.ShowDialog() == DialogResult.OK)
    {
        textBox1.BackColor = colorDialog.Color;
    }
}