c# - 如果控件已更改，如何中断 mouseUp 事件

Question

我刚刚在 Windows 窗体中完成了一个扫雷游戏，这是为了练习。

一切运行良好，但我发现，如果您单击并按住一个按钮，它就会展开，即使鼠标不再指向该按钮也是如此。

您对我如何解决这个问题有简单的想法吗？

代码:

/// <summary>
/// Build up a new Gamefield with the number of buttons, the user has selected
/// </summary>
private void DrawGameField()
{
  _buttons = new Button[_xLength, _yLength];
  for (int yPos = 0; yPos < _yLength; yPos++)
  {
    for (int xPos = 0; xPos < _xLength; xPos++)
    {
      var btn = new Button()
      {
        Tag = new Point(xPos, yPos),
        Location = new Point(xPos * 30, yPos * 30),
        Size = new Size(30, 30),
      };

      _buttons[xPos, yPos] = (Button)btn;
      btn.MouseUp += btn_Click;
      _gamePanel.Controls.Add(btn);
    }
  }
}

/// <summary>
/// Is called when a field is left-clicked
/// </summary>
private void LeftMouseClick(object sender, MouseEventArgs e)
{
  var btn = sender as Button;
  Point pt = (Point)btn.Tag;

  // If there's already a flag on the field make it unclickable for left mouseclick
  if (btn.Image != null)
    return;

  _game.UnfoldAutomatically(pt.X, pt.Y);
  btn.Text = (_game.ReturnNumberInField(pt.X, pt.Y)).ToString();

  // If clicked field was not a bombfield
  if (btn.Text != "-1")
    UnfoldFields();

  else
    LooseGame();
}

每个按钮在 DrawGameField - 方法中都有一个 mouseUp 事件。每个按钮还在该方法中获得一个标签，因此可以识别它。一旦用户 (mouseUp) 单击游戏区域按钮之一，LeftMouseClick 就会被调用。

如果释放鼠标左键的按钮与实际单击的按钮不同，我想取消这一点。

这应该给用户改变主意的可能性......他可能实际上点击了一个字段，然后意识到他不想展开那个字段，但在我的解决方案中他无法撤消他的点击......

Answer 1

伙计们，在一点帮助下，我得到了问题的正确解决方案，如下所示:

使用“MouseClick”而不是“MouseUp”或“MouseDown”。

为什么？

MouseClick 在内部使用 MouseDown 然后执行 MouseCapture(通知，哪个控件在鼠标指针下并检查鼠标是否仍指向该控件)如果为真 -> 点击事件如果为假 -> 返回

工作代码:

/// <summary>
/// Build up a new Gamefield with the number of buttons, the user has selected
/// </summary>
private void DrawGameField()
{
  // _xLength is the length of the field in x-direction
  // _yLength is the length of the field in y-direction
  var buttons = new Button[_xLength, _yLength];

  // Filling the buttonArray
  for (int yPos = 0; yPos < _yLength; yPos++)
  {
    for (int xPos = 0; xPos < _xLength; xPos++)
    {
      var btn = new Button()
      {
        Tag = new Point(xPos, yPos),
        Location = new Point(xPos * 30, yPos * 30),
        Size = new Size(30, 30)
      };
      // Apply a clickEvent to every button
      btn.MouseClick += Button_MouseClick; //first change here: Use MouseClick!!!
      buttons[xPos, yPos] = btn;
    }
  }
  AddGameButtonsToPanel(buttons);
}

/// <summary>
/// Adds Buttons to the gamepanel
/// </summary>
private void AddGameButtonsToPanel(Button[,] buttons)
{
  _buttons = buttons;
  _gamePanel.SuspendLayout();
  try
  {
    foreach (var btn in buttons)
      _gamePanel.Controls.Add(btn);
  }
  finally
  {
    _gamePanel.ResumeLayout();
  }
}

/// <summary>
/// Checks which mouse-button was clicked and calls the correct method for that button
/// </summary>
private void Button_MouseClick(object sender, MouseEventArgs e)
{
  // If it is the firs time a button is clicked, the stopwatch is started
  if (_firstClick)
    StartStopWatch();

  var btn = sender as Button;
  Point pt = (Point)btn.Tag;

  if (e.Button == MouseButtons.Left)
    Button_LeftClick(btn, pt);
  else
    Button_RightClick(btn, pt);
}