panetitle.cs

这是一个小型的相片管理器

using System;
using System.ComponentModel;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Windows.Forms;

namespace VirtualPhotoOrganizer.Controls
{
	/// <summary>
	/// Is placed on top of every pane, changes color due to activeness
	/// </summary>
	internal class PaneTitle : System.Windows.Forms.UserControl
	{
		// some consts needed for proper drawing
		private const int HEIGHT = 20;
		private const string FONTNAME = "arial";
		private const int FONTSIZE = 9;
		private const int OFFSET = 4;

		// color and other vars
		private bool _Active = false;
		private Color ClActiveText = Color.Black;
		private Color ClInactiveText = Color.White;
		private Color ClActiveLow = Color.FromArgb(255, 165, 78);
		private Color ClActiveHigh = Color.FromArgb(255, 225, 155);
		private Color ClInactiveLow = Color.FromArgb(3, 55, 145);
		private Color ClInactiveHigh = Color.FromArgb(90, 135, 215);

		private SolidBrush BrActiveText;
		private SolidBrush BrInactiveText;
		private LinearGradientBrush BrActive;
		private LinearGradientBrush BrInactive;
		private StringFormat Format;

		/// <summary> 
		/// Erforderliche Designervariable.
		/// </summary>
		private System.ComponentModel.Container components = null;

		public PaneTitle() {
			// Dieser Aufruf ist f黵 den Windows Form-Designer erforderlich.
			InitializeComponent();

			// set the buffer style
			this.SetStyle(ControlStyles.DoubleBuffer, true);

			// set the height
			this.Height = HEIGHT;

			// set the string format
			Format = new StringFormat();
			Format.FormatFlags = StringFormatFlags.NoWrap;
			Format.LineAlignment = StringAlignment.Center;
			Format.Trimming = StringTrimming.EllipsisCharacter;

			// set the font
			this.Font = new Font(FONTNAME, FONTSIZE, FontStyle.Bold);

			// set the colors
			this.ActiveTextColor = ClActiveText;
			this.InactiveTextColor = ClInactiveText;

			CreateGradientBrushes();
		}

		/// <summary> 
		/// Die verwendeten Ressourcen bereinigen.
		/// </summary>
		protected override void Dispose(bool disposing) {
			if (disposing) {
				if (components != null) {
					components.Dispose();
				}
			}
			base.Dispose(disposing);
		}

		private void DrawText(Graphics g) {
			g.FillRectangle(this.BackBrush, this.DisplayRectangle);
			g.TextRenderingHint = System.Drawing.Text.TextRenderingHint.AntiAlias;
			RectangleF bounds = new RectangleF(OFFSET, 0, this.DisplayRectangle.Width - OFFSET, this.DisplayRectangle.Height);
			g.DrawString(this.Text, this.Font, this.TextBrush, bounds, Format);
		}

		protected override void OnPaint(PaintEventArgs e) {
			DrawText(e.Graphics);
			base.OnPaint(e);
		}

		protected override void OnSizeChanged(EventArgs e) {
			base.OnSizeChanged(e);
			CreateGradientBrushes();
		}

		private void CreateGradientBrushes() {
			if (this.Width > 0 && this.Height > 0) {
				if (BrActive != null)
					BrActive.Dispose();
				BrActive = new LinearGradientBrush(this.DisplayRectangle, ClActiveHigh, ClActiveLow, LinearGradientMode.Vertical);

				if (BrInactive != null)
					BrInactive.Dispose();
				BrInactive = new LinearGradientBrush(this.DisplayRectangle, ClInactiveHigh, ClInactiveLow, LinearGradientMode.Vertical);
			}
		}


		#region property-accessors

		public override string Text {
			get { return base.Text; }
			set {
				base.Text = value;
				Invalidate();
			}
		}
		public bool Active {
			get { return _Active; }
			set {
				_Active = value;
				Invalidate();
			}
		}
		private Color ActiveTextColor {
			get { return ClActiveText; }
			set {
				ClActiveText = value;
				BrActiveText = new SolidBrush(ClActiveText);
				Invalidate();
			}
		}
		private Color InactiveTextColor {
			get { return ClInactiveText; }
			set {
				ClInactiveText = value;
				BrInactiveText = new SolidBrush(ClInactiveText);
				Invalidate();
			}
		}
		private Color ActiveGradientHighColor {
			get { return ClActiveHigh; }
			set {
				ClActiveHigh = value;
				CreateGradientBrushes();
				this.Invalidate();
			}
		}
		private Color ActiveGradientLowColor {
			get { return ClActiveLow; }
			set {
				ClActiveLow = value;
				CreateGradientBrushes();
				this.Invalidate();
			}
		}
		private Color InactiveGradientHighColor {
			get { return ClInactiveHigh; }
			set {
				ClInactiveHigh = value;
				CreateGradientBrushes();
				this.Invalidate();
			}
		}
		private Color InactiveGradientLowColor {
			get { return ClInactiveLow; }
			set {
				ClInactiveLow = value;
				CreateGradientBrushes();
				this.Invalidate();
			}
		}
		private SolidBrush TextBrush {
			get {
				if (_Active == true)
					return BrActiveText;
				else
					return BrInactiveText;
			}
		}
		private LinearGradientBrush BackBrush {
			get {
				if (_Active == true)
					return BrActive;
				else
					return BrInactive;
			}
		}

		#endregion

		#region Vom Komponenten-Designer generierter Code
		/// <summary> 
		/// Erforderliche Methode f黵 die Designerunterst黷zung. 
		/// Der Inhalt der Methode darf nicht mit dem Code-Editor ge鋘dert werden.
		/// </summary>
		private void InitializeComponent() {
			// 
			// PaneTitle
			// 
			this.Name = "PaneTitle";
			this.Size = new System.Drawing.Size(160, 24);

		}
		#endregion
	}
}