c#中实现拖动无边框form窗体和窗体的起始位置-凯发app官方网站

拖动无边框窗体form至桌面任何位置

首先建一个windows应用程序

将form1的 formborderstyle属性设置为noe

主要是在form1窗体触发三个事件：form4_mousedown，form4_mousemove，form4_mouseup

代码如下：

public partial class form1 : form
    {
        point mouseoff;                          //鼠标移动位置变量
        bool leftflag;                               //标签是否为左键

        public form1()
        {
            initializecomponent();

        }

//用代码设置窗体的起始位置

private void form_load(object sender, system.eventargs e) 
{ 
     this.left=(int)((screen.primaryscreen.bounds.width-this.width)/2); 
     this.top=(int)((screen.primaryscreen.bounds.height-this.height)/2); 
}

 

       private void form1_mousedown(object sender, mouseeventargs e)
        {
            if (e.button == mousebuttons.left)
            {
                mouseoff = new point(-e.x, -e.y); //得到变量的值
                leftflag = true;                              //点击左键按下时标注为true;
            } 
        }

        private void form1_mousemove(object sender, mouseeventargs e)
        {
            if (leftflag)
            {
                point mouseset = control.mouseposition;
                mouseset.offset(mouseoff.x, mouseoff.y); //设置移动后的位置
                location = mouseset;
            }
        }

        private void form1_mouseup(object sender, mouseeventargs e)
        {
            if (leftflag)
            {
                leftflag = false;//释放鼠标后标注为false;
            }
        }

    }