C# winform控件的展开与折叠，点击一下展开，再点击一下折叠

[pencher_liu]

Boss让做一个类似QQ一样的，如下图所示，点击这个展开，再次点击折叠的效果，然后下面的发送 关闭 button也能跟着界面变动位置，求助！！！

[pencher_liu]

快来人呐，急！！！！

[王志威丶]

if (panel1.Visible)
            {
                panel1.Visible = false;
                button1.Left =button1.Left+100;
                button1.Text = "《";
                button2.Left = button2.Left + 100;
                button3.Left = button3.Left + 100;
            }
            else
            {
                panel1.Visible = true;
                button1.Left =button1.Left- 100;
                button1.Text = "》";
                button2.Left = button2.Left - 100;
                button3.Left = button3.Left - 100;
            }

[pencher_liu]

来人呀！！！

[王志威丶]

if (panel1.Visible)
            {
                panel1.Visible = false;
                button1.Left =button1.Left+panel1.Width;
                button1.Text = "《";
                button2.Left = button2.Left + panel1.Width;
                button3.Left = button3.Left + panel1.Width;
            }
            else
            {
                panel1.Visible = true;
                button1.Left =button1.Left- panel1.Width;
                button1.Text = "》";
                button2.Left = button2.Left - panel1.Width;
                button3.Left = button3.Left - panel1.Width;
            }

[pencher_liu]

那个我用的是SplitContainer将form分的左右两边，我使得右边不可见的话会有一大片空白在那儿，有什么办法解决吗

[王志威丶]

if (splitContainer1.Panel2Collapsed)
            {
                splitContainer1.Panel2Collapsed = false;
              
                button1.Left = splitContainer1.SplitterDistance - button1.Width;
                button2.Left = splitContainer1.SplitterDistance - button2.Width;
                button1.Text = "》";
            }
            else
            {
                splitContainer1.Panel2Collapsed = true;
                button1.Left = splitContainer1.Width - button1.Width;
                button2.Left = splitContainer1.Width - button2.Width;
                button1.Text = "《";
            }