C# button override onpaint Image [C# 按鈕重繪事件覆 要具有繪圖功能]
C# button override onpaint Image [C# 按鈕重繪事件覆 要具有繪圖功能]
01.ChatGPT給的答案
To override the OnPaint method of a C# button control and set its background image, you can follow these steps:
Create a custom button control by inheriting from the standard Button class:
csharp
Copy code
public class CustomButton : Button
{
public CustomButton()
{
// Set the button style to flat to avoid any 3D effects
FlatStyle = FlatStyle.Flat;
// Set the background color to transparent
BackColor = Color.Transparent;
}
protected override void OnPaint(PaintEventArgs e)
{
// Call the base OnPaint method to ensure that the button is drawn correctly
base.OnPaint(e);
// Draw the background image if it is set
if (BackgroundImage != null)
{
e.Graphics.DrawImage(BackgroundImage, ClientRectangle);
}
}
}
Set the BackgroundImage property of the button control to the image you want to display as the background:
ini
Copy code
customButton.BackgroundImage = Image.FromFile("path/to/image.png");
Add the custom button control to your form:
kotlin
Copy code
this.Controls.Add(customButton);
With these steps, the custom button control will draw the specified image as its background in the OnPaint method. Note that the FlatStyle property is set to Flat to avoid any 3D effects that might interfere with the background image.
02.自己的應用:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.ComponentModel;
namespace Vteam_UserControl
{
public enum ControlState { Hover, Normal, Pressed }
public class RoundButton : Button
{
public int m_intSID;
public bool m_blnclicked;
private int radius;//半徑
private Color _baseColor = Color.FromArgb(51, 161, 224);//基顏色
private Color _hoverColor = Color.FromArgb(51, 0, 224);//基顏色
private Color _normalColor = Color.FromArgb(0, 161, 224);//基顏色
private Color _disnormalColor = Color.FromArgb(136, 222, 255);//停用基顏色
private Color _pressedColor = Color.FromArgb(51, 161, 0);//基顏色
//圓形按鈕的半徑屬性
[CategoryAttribute("佈局"), BrowsableAttribute(true), ReadOnlyAttribute(false)]
public int Radius
{
set
{
radius = value;
this.Invalidate();
}
get
{
return radius;
}
}
[DefaultValue(typeof(Color), "51, 161, 224")]
public Color NormalColor
{
get
{
return this._normalColor;
}
set
{
this._normalColor = value;
this.Invalidate();
}
}
public Color DisNormalColor
{
get
{
return this._disnormalColor;
}
set
{
this._disnormalColor = value;
this.Invalidate();
}
}
// [DefaultValue(typeof(Color), "220, 80, 80")]
public Color HoverColor
{
get
{
return this._hoverColor;
}
set
{
this._hoverColor = value;
this.Invalidate();
}
}
// [DefaultValue(typeof(Color), "251, 161, 0")]
public Color PressedColor
{
get
{
return this._pressedColor;
}
set
{
this._pressedColor = value;
this.Invalidate();
}
}
public ControlState ControlState { get; set; }
protected override void OnMouseEnter(EventArgs e)//鼠標進入時
{
base.OnMouseEnter(e);
if (!m_blnclicked)
{
ControlState = ControlState.Hover;//正常
}
else
{
ControlState = ControlState.Pressed;//按下的狀態
}
}
protected override void OnMouseLeave(EventArgs e)//鼠標離開
{
base.OnMouseLeave(e);
if(!m_blnclicked)
{
ControlState = ControlState.Normal;//正常
}
else
{
ControlState = ControlState.Pressed;//按下的狀態
}
}
protected override void OnMouseDown(MouseEventArgs e)//鼠標按下
{
base.OnMouseDown(e);
if (e.Button == MouseButtons.Left && e.Clicks == 1)//鼠標左鍵且點擊次數爲1
{
ControlState = ControlState.Pressed;//按下的狀態
m_blnclicked = true;
}
}
protected override void OnMouseUp(MouseEventArgs e)//鼠標彈起
{
base.OnMouseUp(e);
/*
if (e.Button == MouseButtons.Left && e.Clicks == 1)
{
if (ClientRectangle.Contains(e.Location))//控件區域包含鼠標的位置
{
ControlState = ControlState.Hover;
}
else
{
ControlState = ControlState.Normal;
}
}
*/
}
public RoundButton()
{
m_intSID=0;
m_blnclicked =false;
Radius = 15;
this.FlatStyle = FlatStyle.Flat;
this.FlatAppearance.BorderSize = 0;
this.ControlState = ControlState.Normal;
this.SetStyle(
ControlStyles.UserPaint | //控件自行繪製，而不使用操作系統的繪製
ControlStyles.AllPaintingInWmPaint | //忽略擦出的消息，減少閃爍。
ControlStyles.OptimizedDoubleBuffer |//在緩衝區上繪製，不直接繪製到屏幕上，減少閃爍。
ControlStyles.ResizeRedraw | //控件大小發生變化時，重繪。
ControlStyles.SupportsTransparentBackColor, true);//支持透明背景顏色
}
private Color GetColor(Color colorBase, int a, int r, int g, int b)
{
int a0 = colorBase.A;
int r0 = colorBase.R;
int g0 = colorBase.G;
int b0 = colorBase.B;
if (a + a0 > 255) { a = 255; } else { a = Math.Max(a + a0, 0); }
if (r + r0 > 255) { r = 255; } else { r = Math.Max(r + r0, 0); }
if (g + g0 > 255) { g = 255; } else { g = Math.Max(g + g0, 0); }
if (b + b0 > 255) { b = 255; } else { b = Math.Max(b + b0, 0); }
return Color.FromArgb(a, r, g, b);
}
//重寫OnPaint
protected override void OnPaint(System.Windows.Forms.PaintEventArgs e)
{
base.OnPaint(e);
base.OnPaintBackground(e);
e.Graphics.SmoothingMode = SmoothingMode.HighQuality;
e.Graphics.CompositingQuality = CompositingQuality.HighQuality;
e.Graphics.InterpolationMode = InterpolationMode.HighQualityBilinear;
Rectangle rect = new Rectangle(0, 0, this.Width, this.Height);
var path = GetRoundedRectPath(rect, radius);
this.Region = new Region(path);
Color baseColor;
//Color borderColor;
//Color innerBorderColor = this._baseColor;//Color.FromArgb(200, 255, 255, 255); ;
switch (ControlState)
{
case ControlState.Hover:
if (this.Enabled)
{
baseColor = this.HoverColor;
}
else
{
baseColor = this.DisNormalColor;
}
break;
case ControlState.Pressed:
if (this.Enabled)
{
baseColor = this.PressedColor;
}
else
{
baseColor = this.DisNormalColor;
}
break;
case ControlState.Normal:
if (this.Enabled)
{
baseColor = this.NormalColor;
}
else
{
baseColor = this.DisNormalColor;
}
break;
default:
if (this.Enabled)
{
baseColor = this.NormalColor;
}
else
{
baseColor = this.DisNormalColor;
}
break;
}
using (SolidBrush b = new SolidBrush(baseColor))
{
e.Graphics.FillPath(b, path);
Font fo = new System.Drawing.Font("Microsoft JhengHei UI", 14, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point);
Brush brush;
if (this.Enabled)
{
brush = new SolidBrush(this.ForeColor);
}
else
{
brush = new SolidBrush(Color.FromArgb(128,128,128));
}
StringFormat gs = new StringFormat();
gs.Alignment = StringAlignment.Center; //居中
gs.LineAlignment = StringAlignment.Center;//垂直居中
// Draw the background image if it is set [參考ChatGPT]
if (Image != null)
{
e.Graphics.DrawImage(Image, ClientRectangle);
}
e.Graphics.DrawString(this.Text, this.Font, brush, rect, gs);
// e.Graphics.DrawPath(p, path);
}
}
private GraphicsPath GetRoundedRectPath(Rectangle rect, int radius)
{
int diameter = radius;
Rectangle arcRect = new Rectangle(rect.Location, new Size(diameter, diameter));
GraphicsPath path = new GraphicsPath();
path.AddArc(arcRect, 180, 90);
arcRect.X = rect.Right - diameter;
path.AddArc(arcRect, 270, 90);
arcRect.Y = rect.Bottom - diameter;
path.AddArc(arcRect, 0, 90);
arcRect.X = rect.Left;
path.AddArc(arcRect, 90, 90);
path.CloseFigure();
return path;
}
protected override void OnSizeChanged(EventArgs e)
{
base.OnSizeChanged(e);
}
}
}