[ToolboxBitmap(typeof(Label))] publicpartialclassImageLabel : Label { private Image _image; privateint _imageWidth = 32; privateint _imageHeight = 32; privateint _imageTextSpacing = 5; private ContentAlignment _imageAlign = ContentAlignment.MiddleLeft; // 默认图片左中对齐 publicImageLabel() { this.DoubleClick += ImageLabel_DoubleClick; // 确保控件支持透明背景（如果需要） this.SetStyle(ControlStyles.SupportsTransparentBackColor | ControlStyles.ResizeRedraw, true); } #region Public Properties [Category("Appearance")] [Description("The image displayed.")] public Image Image { get { return _image; } set { _image = value; Invalidate(); OnImageChanged(EventArgs.Empty); } } [Category("Appearance")] [DefaultValue(32)] publicint ImageWidth { get { return _imageWidth; } set { _imageWidth = value; Invalidate(); } } [Category("Appearance")] [DefaultValue(32)] publicint ImageHeight { get { return _imageHeight; } set { _imageHeight = value; Invalidate(); } } [Category("Appearance")] [DefaultValue(5)] publicint ImageTextSpacing { get { return _imageTextSpacing; } set { _imageTextSpacing = value; Invalidate(); } } [Category("Appearance")] [Description("Determines the alignment of the image within the control.")] [DefaultValue(ContentAlignment.MiddleLeft)] public ContentAlignment ImageAlign { get { return _imageAlign; } set { _imageAlign = value; Invalidate(); } } #endregion #region Events [Category("Property Changed")] [Description("Occurs when the Image property value changes.")] publicevent EventHandler ImageChanged; protectedvirtualvoidOnImageChanged(EventArgs e) { ImageChanged?.Invoke(this, e); } #endregion #region Overridden Methods protectedoverridevoidOnPaint(PaintEventArgs e) { // 计算图片矩形（根据 ImageAlign 对齐） Rectangle imageRect = GetImageRectangle(); // 计算文字矩形（自动避开图片区域） Rectangle textRect = GetTextRectangle(imageRect); // 绘制图片 if (Image != null) { e.Graphics.DrawImage(Image, imageRect); } // 绘制文字 TextFormatFlags flags = TextFormatFlags.WordBreak | TextFormatFlags.VerticalCenter; // 根据文字对齐方式调整 flags（可选，这里简单使用左对齐） flags |= TextFormatFlags.Left; TextRenderer.DrawText(e.Graphics, this.Text, this.Font, textRect, this.ForeColor, flags); } #endregion #region Private Layout Methods ///<summary> /// 根据 ImageAlign 计算图片的绘制位置 ///</summary> private Rectangle GetImageRectangle() { int x = 0, y = 0; int clientWidth = this.ClientSize.Width; int clientHeight = this.ClientSize.Height; // 水平对齐 switch (ImageAlign) { case ContentAlignment.TopLeft: case ContentAlignment.MiddleLeft: case ContentAlignment.BottomLeft: x = Padding.Left; break; case ContentAlignment.TopCenter: case ContentAlignment.MiddleCenter: case ContentAlignment.BottomCenter: x = (clientWidth - ImageWidth) / 2; break; case ContentAlignment.TopRight: case ContentAlignment.MiddleRight: case ContentAlignment.BottomRight: x = clientWidth - Padding.Right - ImageWidth; break; } // 垂直对齐 switch (ImageAlign) { case ContentAlignment.TopLeft: case ContentAlignment.TopCenter: case ContentAlignment.TopRight: y = Padding.Top; break; case ContentAlignment.MiddleLeft: case ContentAlignment.MiddleCenter: case ContentAlignment.MiddleRight: y = (clientHeight - ImageHeight) / 2; break; case ContentAlignment.BottomLeft: case ContentAlignment.BottomCenter: case ContentAlignment.BottomRight: y = clientHeight - Padding.Bottom - ImageHeight; break; } // 边界检查，确保不超出控件范围 x = Math.Max(Padding.Left, Math.Min(x, clientWidth - Padding.Right - ImageWidth)); y = Math.Max(Padding.Top, Math.Min(y, clientHeight - Padding.Bottom - ImageHeight)); returnnew Rectangle(x, y, ImageWidth, ImageHeight); } ///<summary> /// 计算文字区域，自动避开图片区域 ///</summary> private Rectangle GetTextRectangle(Rectangle imageRect) { Rectangle textRect = new Rectangle(Padding.Left, Padding.Top, this.ClientSize.Width - Padding.Left - Padding.Right, this.ClientSize.Height - Padding.Top - Padding.Bottom); // 如果图片为空，直接返回全区域 if (Image == null) return textRect; // 根据图片对齐方式，判断文字应该放在图片的哪一侧 // 简单策略：如果图片在左边，文字放在右边；图片在右边，文字放在左边；图片在顶部/底部则文字放在剩余区域 // 更完善的方案可以自由组合，这里演示最常见的几种 bool imageLeft = (ImageAlign == ContentAlignment.MiddleLeft || ImageAlign == ContentAlignment.TopLeft || ImageAlign == ContentAlignment.BottomLeft); bool imageRight = (ImageAlign == ContentAlignment.MiddleRight || ImageAlign == ContentAlignment.TopRight || ImageAlign == ContentAlignment.BottomRight); bool imageTop = (ImageAlign == ContentAlignment.TopCenter || ImageAlign == ContentAlignment.TopLeft || ImageAlign == ContentAlignment.TopRight); bool imageBottom = (ImageAlign == ContentAlignment.BottomCenter || ImageAlign == ContentAlignment.BottomLeft || ImageAlign == ContentAlignment.BottomRight); if (imageLeft) { int textLeft = imageRect.Right + ImageTextSpacing; textRect = new Rectangle(textLeft, textRect.Y, this.ClientSize.Width - textLeft - Padding.Right, textRect.Height); } elseif (imageRight) { int textRight = imageRect.Left - ImageTextSpacing; textRect = new Rectangle(Padding.Left, textRect.Y, Math.Max(0, textRight - Padding.Left), textRect.Height); } elseif (imageTop) { int textTop = imageRect.Bottom + ImageTextSpacing; textRect = new Rectangle(textRect.X, textTop, textRect.Width, this.ClientSize.Height - textTop - Padding.Bottom); } elseif (imageBottom) { int textBottom = imageRect.Top - ImageTextSpacing; textRect = new Rectangle(textRect.X, Padding.Top, textRect.Width, Math.Max(0, textBottom - Padding.Top)); } else// 居中情况，文字覆盖图片区域（或简单放在下方） { // 如果图片居中，文字默认放在图片下方 int textTop = imageRect.Bottom + ImageTextSpacing; textRect = new Rectangle(textRect.X, textTop, textRect.Width, this.ClientSize.Height - textTop - Padding.Bottom); } // 确保文字矩形有效 if (textRect.Width < 0) textRect.Width = 0; if (textRect.Height < 0) textRect.Height = 0; return textRect; } #endregion #region Double-click to upload image privatevoidImageLabel_DoubleClick(object sender, EventArgs e) { using (OpenFileDialog openFileDialog = new OpenFileDialog()) { openFileDialog.Title = "请选择一张图片"; openFileDialog.Filter = "图像文件|*.jpg;*.jpeg;*.png;*.gif;*.bmp"; if (openFileDialog.ShowDialog() == DialogResult.OK) { this.Image = Image.FromFile(openFileDialog.FileName); } } } #endregion