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Question

時比較的WinForms控制倉位我有一個包含名爲button1一個按鈕，並呼籲panel1具有色綠一個面板的小程序。到目前爲止，該計劃允許你拖button1周圍的形式。我想擴大這個項目，所以當button1的面板面板的顏色變爲紅色下降。

形式：

至今代碼：

System.Drawing.Point OldPosition; 

public Form1() 
{ 
    InitializeComponent(); 
} 

private void button1_MouseDown(object sender, MouseEventArgs e) 
{ 
    //Only prepare if the button click down is the left button 
    if (e.Button == MouseButtons.Left) 
    { 
     //Store the current mouse location 
     OldPosition = e.Location; 
     //Change the mouse cursor if you want 
     button1.Cursor = Cursors.Hand; 
    } 
} 

private void button1_MouseMove(object sender, MouseEventArgs e) 
{ 
    //Only move if the left button still down 
    if (e.Button == MouseButtons.Left) 
    { 
     button1.Location = new Point(button1.Location.X + (e.X - OldPosition.X), button1.Location.Y + (e.Y - OldPosition.Y)); 
    } 
} 

private void Form1_Load(object sender, EventArgs e) 
{ 
    panel1.BackColor = Color.Green;   
} 

private void panel1_MouseEnter(object sender, EventArgs e) 
{ 
    if (button1.Location == panel1.Location) 
     panel1.BackColor = Color.Red; //im not sure how to do this part 
} 

Answer 1

嘗試下面的代碼：

private void button1_MouseMove(object sender, MouseEventArgs e) 
{ 
    //Only move if the left button still down 
    if (e.Button == MouseButtons.Left) 
    { 
     button1.Location = new Point(button1.Location.X + (e.X - OldPosition.X), button1.Location.Y + (e.Y - OldPosition.Y)); 

     //CHECK IF NEW LOCATION IS WITHIN PANEL BOUNDS 
     if (panel1.Bounds.Contains(button1.Location)) 
      panel1.BackColor = Color.Red; 
     else 
      panel1.BackColor = Color.Green; 
    } 
} 

而且你可能需要設計師「SEND TO BACK」的panel1控制，否則按鈕將不可如果它通過面板可見。