[英]How to make two transparent layer with c#?
有连续的三层,
picturebox1(.jpg) -> label1 -> picturebox2(.png transparent)
我想要的是让 label1 和 picturebox2 对 picturebox1 透明,这样 label1 就可以通过 picturebox2 看到,但它不起作用..
public Form1()
{
InitializeComponent();
label1.Parent = pictureBox1;
label1.BackColor = Color.Transparent;
pictureBox2.Parent = pictureBox1;
pictureBox2.BackColor = Color.Transparent;
picturebox2.BringToFront();
}
所以请帮助我
如果需要控件支持透明性,则应覆盖控件的绘制并按以下顺序绘制控件:
BackColor
也应该是Color.Transparent
。 这是创建TransparentLabel
和TransparentPictureBox
控件的结果。 在下面的图像中,依次有标签,图像,标签,图像和标签,如您所见,图片框和标签已呈现为具有透明背景并遵循z索引:
透明标签
class TransparentLabel : Label
{
public TransparentLabel()
{
this.BackColor = Color.Transparent;
}
protected override void OnPaint(PaintEventArgs e)
{
if (Parent != null && this.BackColor == Color.Transparent)
{
using (var bmp = new Bitmap(Parent.Width, Parent.Height))
{
Parent.Controls.Cast<Control>()
.Where(c => Parent.Controls.GetChildIndex(c) > Parent.Controls.GetChildIndex(this))
.Where(c => c.Bounds.IntersectsWith(this.Bounds))
.OrderByDescending(c => Parent.Controls.GetChildIndex(c))
.ToList()
.ForEach(c => c.DrawToBitmap(bmp, c.Bounds));
e.Graphics.DrawImage(bmp, -Left, -Top);
}
}
base.OnPaint(e);
}
}
透明图片框
class TransparentPictureBox : PictureBox
{
public TransparentPictureBox()
{
this.BackColor = Color.Transparent;
}
protected override void OnPaint(PaintEventArgs e)
{
if (Parent != null && this.BackColor==Color.Transparent)
{
using (var bmp = new Bitmap(Parent.Width, Parent.Height))
{
Parent.Controls.Cast<Control>()
.Where(c => Parent.Controls.GetChildIndex(c) > Parent.Controls.GetChildIndex(this))
.Where(c => c.Bounds.IntersectsWith(this.Bounds))
.OrderByDescending(c => Parent.Controls.GetChildIndex(c))
.ToList()
.ForEach(c => c.DrawToBitmap(bmp, c.Bounds));
e.Graphics.DrawImage(bmp, -Left, -Top);
}
}
base.OnPaint(e);
}
}
这是我的工作。 真是个好主意,谢谢。
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