如何用C#做一个悬浮窗口程序

转自：愚翁
如何用C#做一个悬浮窗口程序

用C#做一个像FlashGet的悬浮窗口，其实很简单，不像以前需要调用很多系统API。大致的步骤如下。

首先是主窗体部分，即要判断窗体的状态来决定是否显示悬浮窗口。

局部成员声明：

private FormWindowState fwsPrevious;

private frmTopMost myTopMost;

主窗体的Load事件：

private void frmMain_Load(object sender, System.EventArgs e)

{

// Save window state

fwsPrevious = this.WindowState;

// Create top most window

myTopMost = new frmTopMost( this );

}

主窗体的SizeChanged事件：

private void frmMain_SizeChanged(object sender, System.EventArgs e)

{

if( this.WindowState == FormWindowState.Minimized )

{

// Window minimized

// Show top most window

myTopMost.Show();

this.ShowInTaskbar = false;

}

else if( this.WindowState != fwsPrevious )

{

// Save current window state

fwsPrevious = this.WindowState;

}

}

然后，就是还原窗口方法，即供悬浮窗口进行调用的。

/// <summary>

/// Restore window state

/// </summary>

public void RestoreWindow()

{

this.WindowState = fwsPrevious;

this.ShowInTaskbar = true;

}

下来就是悬浮窗口部分代码，首先要设置其窗体的FormBorderStyle为None，然后设置其的TopMost为true，接下来，就是主要是三个鼠标事件的处理，以下，具体说明如何实现的。

局部成员声明。

private Point ptMouseCurrrnetPos, ptMouseNewPos,

ptFormPos, ptFormNewPos;

private bool blnMouseDown=false;

private frmMain pParent;

悬浮窗口的构造函数。

public frmTopMost( frmMain pMain )

{

//

// Required for Windows Form Designer support

//

InitializeComponent();

// Init main window object

pParent = pMain;

}

悬浮窗口的Load事件。

private void frmTopMost_Load(object sender, System.EventArgs e)

{

this.Show();

// Init window size and position

this.Top = 100;

this.Left = Screen.PrimaryScreen.Bounds.Width - 100;

this.Width = 80;

this.Height = 80;

}

主要的三个鼠标事件，即MouseDown、 MouseMove、 MouseUp三个事件。

private void frmTopMost_MouseMove(object sender, System.Windows.Forms.MouseEventArgs e)

{

if( blnMouseDown )

{

//Get the current position of the mouse in the screen

ptMouseNewPos = Control.MousePosition;

//Set window position

ptFormNewPos.X = ptMouseNewPos.X - ptMouseCurrrnetPos.X + ptFormPos.X;

ptFormNewPos.Y = ptMouseNewPos.Y - ptMouseCurrrnetPos.Y + ptFormPos.Y;

//Save window position

Location = ptFormNewPos;

ptFormPos = ptFormNewPos;

//Save mouse position

ptMouseCurrrnetPos = ptMouseNewPos;

}

}

private void frmTopMost_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e)

{

if(e.Button==MouseButtons.Left)

{

blnMouseDown = true;

// Save window position and mouse position

ptMouseCurrrnetPos = Control.MousePosition;

ptFormPos = Location;

}

}

private void frmTopMost_MouseUp(object sender, System.Windows.Forms.MouseEventArgs e)

{

if( e.Button == MouseButtons.Left)

//Return back signal

blnMouseDown = false;

}

然后就是双击悬浮窗体，进行恢复主窗体。

private void frmTopMost_DoubleClick(object sender, System.EventArgs e)

{

SwitchToMain();

}

private void SwitchToMain()

{

//Change main window status here

pParent.RestoreWindow();

//Hide top most window

this.Hide();

}

此外，还可以给悬浮窗口添加ContextMenu，来辅助操作，这里就不细说了。

private System.Windows.Forms.ContextMenu mnuPopup;

private System.Windows.Forms.MenuItem mnuMainWindow;

private System.Windows.Forms.MenuItem mnuExit;

private void mnuMainWindow_Click(object sender, System.EventArgs e)

{

SwitchToMain();

}

private void mnuExit_Click(object sender, System.EventArgs e)

{

Application.Exit();

}

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