在拖動運行時控制閃爍

Question

堆棧溢出用戶。 在C＃VS 2010 Windows窗體項目中，在運行時在選項卡頁面上拖動用戶創建的控件時，我遇到有關控件閃爍的問題。 我使用以下代碼：

private void control_MouseMove(object sender, MouseEventArgs e)         
{              
    if (isDragged)             
    {                 
        Point newPoint = ((Control)sender).PointToScreen(new Point(e.X, 
        e.Y));                 
        newPoint.Offset(ptOffset);                 
        ((Control)sender).Location = newPoint;                 
        ((Control)sender).Refresh();             
    }         
}          
private void control_MouseDown(object sender, MouseEventArgs e)         
{                           
    if (e.Button == MouseButtons.Left)             
    {                 
        isDragged = true;                 
        Point ptStartPosition = ((Control)sender).PointToScreen(new 
        Point(e.X, e.Y));                  
        ptOffset = new Point();                 
        ptOffset.X = ((Control)sender).Location.X - ptStartPosition.X;                 
        ptOffset.Y = ((Control)sender).Location.Y - ptStartPosition.Y;             
    }             
    else             
    {                 
        isDragged = false;             
    }          
}          
private void control_MouseUp(object sender, MouseEventArgs e)         
{             
    ((Control)sender).Refresh();             
    isDragged = false;         
}
private void createButton_PB_Click(object sender, EventArgs e)
{
    int ctrlExists = 0;
    string btnName = btnName_TB.Text;

    foreach (Button button in tabControl1.SelectedTab.Controls)
    {
        if (button.Text == btnName)
        {
            ctrlExists = 1;
        }
    }
    if (btnName_TB.Text != "" && ctrlExists == 0)
    {               
        Button newButton = new Button();
        newButton.Name = btnName.Replace(" ", String.Empty);
        newButton.Name += "u";
        newButton.Text = btnName;
        tabControl1.SelectedTab.Controls.Add(newButton);
        newButton.Left = 10;
        newButton.Top = 420;  
        lastBtnClicked = newButton;
    }
    SetupClickEvents(tabControl1.SelectedTab);
}

因此，問題在於我可以在運行時添加一個按鈕並將其拖動。 但是，當我添加另一個Button並將其拖動到...之后，然后返回嘗試拖動第一個按鈕，該按鈕會閃爍並表現為好像它試圖在整個位置移動。 有時它消失了。 我覺得這與控件位於選項卡頁中有關。 也許我沒有正確計算“ newPoint”變量。 有想法嗎？

Answer 1

好的，所以我發現了一些與按鈕創建以及創建時添加的事件有關的基本缺陷。 我做了一些相當大的改變，這個問題似乎已經消失了。 以下是更新的代碼。

    private void control_MouseMove(object sender, MouseEventArgs e)
    { 
        if (isDragged)
        {
            Point newPoint = ((Control)sender).PointToScreen(new Point(e.X, 
            e.Y));
            newPoint.Offset(ptOffset);
            ((Control)sender).Location = newPoint;
            ((Control)sender).Refresh();
        }
    }

    private void control_MouseDown(object sender, MouseEventArgs e)
    {
        if (e.Button == MouseButtons.Left && checkBox1.Checked)
        {
            isDragged = true;

            ((Control)sender).MouseMove += new 
            MouseEventHandler(control_MouseMove);

            Point ptStartPosition = ((Control)sender).PointToScreen(new 
            Point(e.X, e.Y));

            ptOffset = new Point();
            ptOffset.X = ((Control)sender).Location.X - ptStartPosition.X;
            ptOffset.Y = ((Control)sender).Location.Y - ptStartPosition.Y;
        }
        else
        {
            isDragged = false;
        }

    }

    private void control_MouseUp(object sender, MouseEventArgs e)
    {
        ((Control)sender).MouseMove -= control_MouseMove;
        ((Control)sender).Refresh();
        isDragged = false;
    }

    private void SetupClickEvents(Control control)
    {            
        control.Click += new EventHandler(StoreLastClick);
        control.MouseDown += new MouseEventHandler(control_MouseDown);
        //control.MouseMove += new MouseEventHandler(control_MouseMove);
        control.MouseUp += new MouseEventHandler(control_MouseUp);            
    }



    private void createButton_PB_Click(object sender, EventArgs e)
    {
        ctrlExists = 0;
        string btnName = btnName_TB.Text;

        foreach (Button button in tabControl1.SelectedTab.Controls)
        {
            if (button.Name == btnName)
            {
                ctrlExists = 1;
            }
        }
        if (btnName_TB.Text != "" && ctrlExists == 0)
        {               
            Button newButton = new Button();
            newButton.Name = btnName.Replace(" ", String.Empty);
            newButton.Text = btnName;
            tabControl1.SelectedTab.Controls.Add(newButton);
            newButton.Left = 10;
            newButton.Top = 420;
            SetupClickEvents(newButton);
        }
    }

    private void deleteButton_PB_Click(object sender, EventArgs e)
    {
        ctrlExists = 0;

        if (lastCtrlClicked != null)
        {
            string btnName = lastCtrlClicked.Name;
            foreach (Button button in tabControl1.SelectedTab.Controls)
            {
                if (button.Name == btnName)
                {
                    ctrlExists = 1;
                }
            }
        }

        if (ctrlExists == 1 && lastCtrlClicked != null)
        {
            tabControl1.SelectedTab.Controls.Remove(lastCtrlClicked);
            lastCtrlClicked.Dispose();
            ctrlExists = 0;
        }
        lastCtrlClicked = null;
    }