Winform中，如何让普通button当被点击时有被压下去的效果？
Winform中，如何让普通button当被点击时有被压下去的效果？
[解决办法]
using System;
using System.Windows.Forms;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Diagnostics;
using System.Drawing.Imaging;
using System.ComponentModel;
namespace AquaButtonTester
{
/// <summary>
/// Summary description for AquaButton.
/// </summary>
[Serializable]
public class AquaButton : System.Windows.Forms.Button
{
/// <summary>
/// Required designer variable.
/// </summary>
private System.ComponentModel.Container components = null;
private bool pulseOnFocus;
///
///Additional variables to handle pulsing
///
private ImageAttributes imgAttr = new ImageAttributes();
private float gamma;
private float minGamma;
private float maxGamma;
private float gammaStep;
private Timer pulseTimer = new Timer();
private Bitmap buttonBitmap;
private Rectangle buttonBitmapRectangle;
public AquaButton()
{
// This call is required by the Windows.Forms Form Designer.
InitializeComponent();
mouseAction = MouseActionType.None;
this.SetStyle(ControlStyles.AllPaintingInWmPaint |
ControlStyles.DoubleBuffer |
ControlStyles.UserPaint, true);
//The following defaults are better suited to draw the text outline
this.Font = new Font( "Arial Black ", 12, FontStyle.Bold);
this.BackColor = Color.DarkTurquoise;
this.Size = new Size(112, 48);
//Initialize variables to Pulse button
gamma = 1.0f;
minGamma = 1.0f;
maxGamma = 2.2f;
gammaStep = .2f;
pulseTimer.Interval = 90;
pulseTimer.Tick +=new EventHandler(pulseTimer_Tick);
}
[DefaultValue(false)]
public bool PulseOnFocus
{
get { return pulseOnFocus; }
set { pulseOnFocus = value; Invalidate(); }
}
/// <summary>
/// Clean up any resources being used.
/// </summary>
protected override void Dispose( bool disposing )
{
if( disposing )
{
if(components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}
#region Component Designer generated code
/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeComponent()
{
components = new System.ComponentModel.Container();
}
#endregion
private enum MouseActionType
{
None,
Hover,
Click
}
private MouseActionType mouseAction;
protected override void OnPaint(PaintEventArgs e)
{
Graphics g = e.Graphics;
g.Clear(Color.White);
Color clr = this.BackColor;
int shadowOffset = 8;
int btnOffset = 0;
switch (mouseAction)
{
case MouseActionType.Click:
shadowOffset = 4;
clr = Color.Gold;
btnOffset = 2;
break;
case MouseActionType.Hover:
clr = Color.Gold;
break;
}
g.SmoothingMode = SmoothingMode.AntiAlias;
///
/// Create main colored shape
///
Rectangle rc = new Rectangle(btnOffset,btnOffset,this.ClientSize.Width-8-btnOffset, this.ClientSize.Height-8-btnOffset);
GraphicsPath path1 = this.GetPath(rc, 20);
LinearGradientBrush br1 = new LinearGradientBrush(new Point(0, 0),new Point(0, rc.Height+6), clr, Color.White);
///
/// Create shadow
///
Rectangle rc2 = rc;
rc2.Offset(shadowOffset, shadowOffset);
GraphicsPath path2 = this.GetPath(rc2, 20);
PathGradientBrush br2 = new PathGradientBrush(path2);
br2.CenterColor = ControlPaint.DarkDark(Color.Silver);
br2.SurroundColors = new Color[]{Color.White};
///
/// Create top water color to give "aqua " effect
///
Rectangle rc3 = rc;
rc3.Inflate(-5, -5);
rc3.Height = 15;
GraphicsPath path3 = GetPath(rc3, 20);
LinearGradientBrush br3 = new LinearGradientBrush(rc3, Color.FromArgb(255, Color.White), Color.FromArgb(0, Color.White), LinearGradientMode.Vertical);
///
///draw shapes
///
g.FillPath(br2, path2);//draw shadow
g.FillPath(br1, path1); //draw main
g.FillPath(br3, path3); //draw top bubble
///
///Create a backup of the button image to a bitmap so we can manipulate it 's pulsing action
///
buttonBitmapRectangle = new Rectangle(rc.Location, rc.Size);
buttonBitmap = new Bitmap(buttonBitmapRectangle.Width, buttonBitmapRectangle.Height);
Graphics g_bmp = Graphics.FromImage(buttonBitmap);
g_bmp.SmoothingMode = SmoothingMode.AntiAlias;
g_bmp.FillPath(br1, path1);
g_bmp.FillPath(br3, path3);
///
///Set the region for the button
Region rgn = new Region(path1);
rgn.Union(path2);
this.Region = rgn;
///
/// Create a Path to draw the text to give the button a nice outline
///
GraphicsPath path4 = new GraphicsPath();
RectangleF path1bounds = path1.GetBounds();
Rectangle rcText = new Rectangle((int)path1bounds.X, (int)path1bounds.Y, (int)path1bounds.Width, (int)path1bounds.Height);
StringFormat strformat = new StringFormat();
strformat.Alignment = StringAlignment.Center;
strformat.LineAlignment = StringAlignment.Center;
path4.AddString(this.Text, this.Font.FontFamily, (int)this.Font.Style, this.Font.Size,
rcText, strformat);
Pen txtPen = new Pen(this.ForeColor, 1);
g.DrawPath(txtPen, path4);
g_bmp.DrawPath(txtPen, path4);
}
private GraphicsPath GetPath(Rectangle rc, int r)
{
int x = rc.X, y = rc.Y, w = rc.Width, h = rc.Height;
GraphicsPath path = new GraphicsPath();
path.AddArc(x, y, r, r, 180, 90);//Upper left corner
path.AddArc(x+w - r, y, r, r, 270, 90);//Upper right corner
path.AddArc(x+w - r, y+h - r, r, r, 0, 90);//Lower right corner
path.AddArc(x, y+h - r, r, r, 90, 90);//Lower left corner
path.CloseFigure();
return path;
}
protected override void OnMouseDown(MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
this.mouseAction = MouseActionType.Click;
this.Invalidate();
}
base.OnMouseDown (e);
}
protected override void OnMouseUp(MouseEventArgs e)
{
if (this.Bounds.Contains(e.X, e.Y))
this.mouseAction = MouseActionType.Hover;
else
this.mouseAction = MouseActionType.None;
this.Invalidate();
base.OnMouseUp (e);
}
protected override void OnMouseEnter(EventArgs e)
{
this.mouseAction = MouseActionType.Hover;
this.Invalidate();
base.OnMouseEnter (e);
}
protected override void OnMouseLeave(EventArgs e)
{
this.mouseAction = MouseActionType.None;
this.Invalidate();
base.OnMouseLeave (e);
}
//-----------------------------
// METHODS TO HANDLE PULSING
//-----------------------------
protected override void OnGotFocus(EventArgs e)
{
base.OnGotFocus (e);
if (this.pulseOnFocus)
pulseTimer.Start();
}
protected override void OnLostFocus(EventArgs e)
{
base.OnLostFocus (e);
pulseTimer.Stop();
this.Invalidate(); //redraw to get back it 's original picture
}
private void pulseTimer_Tick(object sender, EventArgs e)
{
if (this.Focused && pulseOnFocus && buttonBitmap != null)
{
gamma += gammaStep;
if (gamma > this.maxGamma) gammaStep = - gammaStep;
if (gamma < this.minGamma) gammaStep = Math.Abs(gammaStep);
imgAttr.SetGamma(gamma);
this.CreateGraphics().DrawImage(buttonBitmap, buttonBitmapRectangle, 0, 0,
buttonBitmap.Width, buttonBitmap.Height, GraphicsUnit.Pixel, imgAttr);
}
}
}
}
[解决办法]
简单点就是用贴图，这样一个按钮可以产生很多效果，完全取决贴图的式样