如何用C#做一個懸浮視窗程序

轉自：愚翁如何用C#做一個懸浮視窗程序

用C#做一個像FlashGet的懸浮視窗，其實很簡單，不像以前需要調用很多系統API。大致的步驟如下。

 

首先是主表單部分，即要判斷表單的狀態來決定是否顯示懸浮視窗。

局部成員聲明：

    private FormWindowState fwsPrevious;

    private frmTopMost myTopMost;

 

主表單的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 );

    }

   

    主表單的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;

        }

    }

 

       然後，就是還原視窗方法，即供懸浮視窗進行調用的。

    /// <summary>

    /// Restore window state

    /// </summary>

    public void RestoreWindow()

    {

        this.WindowState = fwsPrevious;

        this.ShowInTaskbar = true;

    }

       下來就是懸浮視窗部分代碼，首先要設定其表單的FormBorderStyle為None，然後設定其的TopMost為true，接下來，就是主要是三個滑鼠事件的處理，以下，具體說明如何?的。

       局部成員聲明。

    private Point ptMouseCurrrnetPos, ptMouseNewPos,

        ptFormPos, ptFormNewPos;

    private bool blnMouseDown=false;

    private frmMain pParent;

 

       懸浮視窗的建構函式。

    public frmTopMost( frmMain pMain )

    {

        //

        // Required for Windows Form Designer support

        //

        InitializeComponent();

 

        // Init main window object

        pParent = pMain;

    }

 

    懸浮視窗的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;

    }

 

       主要的三個滑鼠事件，即MouseDown、 MouseMove、 MouseUp三個事件。

    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;

    }

 

    然後就是雙擊懸浮表單，進行恢複主表單。

    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，還可以給懸浮視窗添加ContextMenu，來輔助操作，這裡就不細說了。

    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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