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//------------------------------------------------------------
// Copyright (c) Microsoft Corporation. All rights reserved.
//------------------------------------------------------------
namespace System.Workflow.Activities.Design
{
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Text;
using System.Windows.Forms;
using System.Drawing.Drawing2D;
internal partial class GradientPanel : Panel
{
protected Rectangle frameRect;
private Color baseColor;
private Color borderColor;
private bool dropShadow;
int glossHeight;
private bool glossy;
private Color lightingColor;
private int radius;
public GradientPanel()
{
BaseColor = Color.FromArgb(255, 255, 255, 255);
LightingColor = Color.FromArgb(255, 176, 186, 196);
Radius = 7;
this.DoubleBuffered = true;
}
public Color BaseColor
{
get { return baseColor; }
set { baseColor = value; }
}
public Color BorderColor
{
get { return borderColor; }
set { borderColor = value; }
}
public bool DropShadow
{
get { return dropShadow; }
set { dropShadow = value; }
}
public bool Glossy
{
get { return glossy; }
set { glossy = value; }
}
public Color LightingColor
{
get { return lightingColor; }
set { lightingColor = value; }
}
public int Radius
{
get { return radius; }
set { radius = value; }
}
protected override void OnPaint(PaintEventArgs e)
{
base.OnPaint(e);
this.SuspendLayout();
e.Graphics.SmoothingMode = SmoothingMode.HighQuality;
if (DropShadow)
{
frameRect = new Rectangle(6, 0, this.Size.Width - 14, this.Size.Height - 8);
}
else
{
frameRect = new Rectangle(0, 0, this.Size.Width - 1, this.Size.Height - 1);
}
frameRect.X -= Margin.Left;
frameRect.Y -= Margin.Top;
frameRect.Width += Margin.Left + Margin.Right;
frameRect.Height += Margin.Top + Margin.Bottom;
Rectangle shadowRect = new Rectangle(frameRect.X, frameRect.Y + 6, frameRect.Width, frameRect.Height - 5);
glossHeight = frameRect.Height / 3;
Brush glossBrush = new LinearGradientBrush(new Point(frameRect.Left, frameRect.Top), new Point(frameRect.Left, frameRect.Top + glossHeight + 1), Color.FromArgb(120, 255, 255, 255), Color.FromArgb(60, 255, 255, 255)); // SolidBrush(Color.FromArgb(32, 255, 255, 255));
Brush frameBrush = new LinearGradientBrush(new Point(frameRect.Left, frameRect.Top), new Point(frameRect.Left, frameRect.Bottom), BaseColor, LightingColor);
Graphics outputGraphics = e.Graphics;
if (DropShadow)
{
shadowRect = DropRoundedRectangleShadow(shadowRect, outputGraphics);
}
e.Graphics.FillPath(frameBrush, RoundedRect(frameRect));
if (Glossy)
{
e.Graphics.FillPath(glossBrush, RoundedRectTopHalf(frameRect));
}
e.Graphics.DrawPath(new Pen(this.BorderColor), RoundedRect(frameRect));
this.ResumeLayout();
}
private Rectangle DropRoundedRectangleShadow(Rectangle shadowRect, Graphics outputGraphics)
{
int shadowIntensity = 1;
using (Pen shadowPen = new Pen(Color.FromArgb(shadowIntensity, 0, 0, 0)))
{
shadowPen.Width = 16;
for (int i = 0; i < 8; i++)
{
outputGraphics.DrawPath(shadowPen, RoundedRect(shadowRect));
shadowPen.Color = Color.FromArgb(shadowIntensity - 1, 0, 0, 0);
shadowIntensity += 8;
shadowPen.Width = shadowPen.Width - 2;;
}
return shadowRect;
}
}
private GraphicsPath RoundedRect(Rectangle frame)
{
GraphicsPath path = new GraphicsPath();
if (Radius < 1)
{
path.AddRectangle(frame);
return path;
}
int diameter = Radius * 2;
Rectangle arc = new Rectangle(frame.Left, frame.Top, diameter, diameter);
path.AddArc(arc, 180, 90);
arc.X = frame.Right - diameter;
path.AddArc(arc, 270, 90);
arc.Y = frame.Bottom - diameter;
path.AddArc(arc, 0, 90);
arc.X = frame.Left;
path.AddArc(arc, 90, 90);
path.CloseFigure();
return path;
}
private GraphicsPath RoundedRectTopHalf(Rectangle frame)
{
GraphicsPath path = new GraphicsPath();
int diameter = Radius * 2;
Rectangle arc = new Rectangle(frame.Left, frame.Top, diameter, diameter);
path.AddArc(arc, 180, 90);
arc.X = frame.Right - diameter;
path.AddArc(arc, 270, 90);
path.AddLine(new Point(frame.Right, frame.Top + glossHeight), new Point(frame.Left, frame.Top + glossHeight));
path.CloseFigure();
return path;
}
}
}
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