在.NET Compact Framework中單擊“觸發器”按鈕

Question

假設我有一個包含許多Button和PictureBox控件的Panel。 每個控件都有一個關聯的Click事件。 這是一個觸摸屏應用程序，因此用戶點擊可能會有點不精確（或者觸摸屏校准可能不完美）。 所以，我想處理面板上的click事件，然后如果點擊接近按鈕/圖片，則以編程方式調用Button或PictureBox的Click事件。

許多其他答案建議使用“PerformClick”事件，但Compact Framework不支持此功能。 任何替代品？ 我的代碼：

private void pnlButtons_Click(object sender, EventArgs e)
{
    Point ptClick = Control.MousePosition;
    foreach (Control cntrl in pnlButtons.Controls)
    {
        // Make sure the control is visible!
        if (cntrl.Visible)
        {
            // Click close to control?
            if ((ptClick.X > (cntrl.Left - 5)) &&
                (ptClick.X < (cntrl.Right + 5)) &&
                (ptClick.Y > (cntrl.Top - 5)) &&
                (ptClick.Y < (cntrl.Bottom + 5)))
            {
                // Click Button or PictureBox without cntrl.PerformClick?
            }
        }
    }
}

Answer 1

由於您無法使用PerformClick ，因此在這種情況下您將無法依賴控件的Click事件處理程序自動觸發。 相反，只需創建一個方法來控制並從該控件中找出要采取的操作。 例：

private void pnlButtons_Click(object sender, EventArgs e)
{
    Point ptClick = Control.MousePosition;
    foreach (Control cntrl in pnlButtons.Controls)
    {
        // Make sure the control is visible!
        if (cntrl.Visible)
        {
            // Click close to control?
            if ((ptClick.X > (cntrl.Left - 5)) &&
                (ptClick.X < (cntrl.Right + 5)) &&
                (ptClick.Y > (cntrl.Top - 5)) &&
                (ptClick.Y < (cntrl.Bottom + 5)))
            {
                handleClick (cntrl);
            }
        }
    }
}

private void handleClick(Control c)
{
    if (c == button1)
    {
        // handle button1 click, e.g. by calling its `Click` handler
    }
    else if (c == picureBox1)
    {
        // handle pictureBox1 click
    }
    // et cetera
}

Answer 2

首先，嘗試子類化按鈕並從您自己的PerformClick調用click事件。 否則，您可以編寫一個按鈕並執行單擊的方法。 首先獲取控件的句柄，然后p /調用windows API函數向它發送mousedown然后mouseup事件。 我相信它是SendMessage函數。 然后，您只需編寫邏輯以找到最近的按鈕並將其傳遞給函數。 或者，將其作為Button的擴展方法

https://msdn.microsoft.com/en-us/library/windows/desktop/ms644950%28v=vs.85%29.aspx

編輯：這是通過向控件發送mousedown和mouseup消息來模擬點擊的完整代碼：

// Windows constants for mouse messages
private const int WM_LBUTTONDOWN        = 0x0201;
private const int WM_LBUTTONUP          = 0x0202;

// P/Invoke for SendMessage
[DllImport("coredll.dll")]
public static extern IntPtr SendMessage(IntPtr hWnd, int nMsg, IntPtr wParam, IntPtr lParam);

// Method to click a control
public void ClickControl(IntPtr hWnd)
{
    // Send a MOUSE_DOWN and MOUSE_UP message to the control to simulate a click
    SendMessage(hWnd, WM_LBUTTONDOWN, IntPtr.Zero, IntPtr.Zero);
    SendMessage(hWnd, WM_LBUTTONUP, IntPtr.Zero, IntPtr.Zero);
}

// Method to handle click event on parent Panel control
private void pnlButtons_Click(object sender, EventArgs e)
{
    // See if the click point is close to a (visible) button and if so, click the button.
    // The user was probably a little imprecise or the screen might need re-calibration.
    Point pt = pnlButtons.PointToClient(Cursor.Position);

    // Now look for any Button / PictureBox controls nearby
    foreach (Control cntrl in pnlButtons.Controls)
    {
        Rectangle inflated = cntrl.Bounds;
        inflated.Inflate(4, 5);
        if (cntrl.Visible && inflated.Contains(pt))
        {
            // Simulate a click on the control
            ClickControl(cntrl.Handle);
            break;
        }
    }
}

Answer 3

將按鈕單擊處理程序中的所有內容放到單獨的函數中，然后調用該函數而不是觸發按鈕單擊。

private void pnlButtons_Click(object sender, EventArgs e)
{
    Point ptClick = Control.MousePosition;
    foreach (Control cntrl in pnlButtons.Controls)
    {
        // Make sure the control is visible!
        if (cntrl.Visible)
        {
            // Click close to control?
            if ((ptClick.X > (cntrl.Left - 5)) &&
                (ptClick.X < (cntrl.Right + 5)) &&
                (ptClick.Y > (cntrl.Top - 5)) &&
                (ptClick.Y < (cntrl.Bottom + 5)))
            {
                PerformActionsOnClick();
            }
        }
    }
}
private void MyButton_Click(object sender, EventArgs e)
{
    PerformActionsOnClick();
}
void PerformActionsOnClick()
{
    //do your stuff here
}