C# PicBtn Control 图形按钮

最新推荐文章于 2024-09-04 09:35:59 发布

原创最新推荐文章于 2024-09-04 09:35:59 发布 · 818 阅读

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这篇博客介绍了如何在C#中创建和使用图形按钮控件PicBtn，提供了一个简单的实现示例，可供参考。

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;

namespace Demo
{
    public class PicBtn : Control, IDisposable // 图形按钮
    {
        [DllImportAttribute("user32")]
        static extern int SetWindowLong(IntPtr hWnd, int nlndex, IntPtr dwNewStyle);

        [DllImportAttribute("user32")]
        static extern int CallWindowProc(int hWinProc, int hWND, int Msg, int wParam, int lParam);

        int _hWinProc = 0; MSG _MSG = null; EventHandler _Draw = null;

        const int GWL_WNDPROC = -4, WM_MOUSEFIRST = 512, WM_SHOWWINDOW = 24,
        WM_MOUSELEAVE = 675, WM_LBUTTONDOWN = 513, WM_LBUTTONUP = 514, WM_PAINT = 15;

        delegate int MSG(int hWnd, int Msg, int wParam, int lParam);

        public PicBtn()
        {
            this._MSG = (hWnd, Msg, wParam, lParam) => {
                switch (Msg) {
                    case WM_MOUSEFIRST:
                        this._Draw(1, null);
                        break;
                    case WM_MOUSELEAVE:
                        this._Draw(0, null);
                        break;
                    case WM_LBUTTONDOWN:
                        this._Draw(2, null);
                        break;
                    case WM_LBUTTONUP:
                        this._Draw(1, null);
                        break;
                }
                return CallWindowProc(this._hWinProc, hWnd, Msg, wParam, lParam);
            };
            GC.SuppressFinalize(this._MSG); GCHandle.Alloc(this._MSG);
            this._hWinProc = SetWindowLong(this.Handle, GWL_WNDPROC, Marshal.GetFunctionPointerForDelegate(this._MSG));
            this._Draw = (sender, e) => {
                if (!(sender is int)) {
                    return;
                }
                using (var _g = this.CreateGraphics()) {
                    var x = (int)sender;
                    var client = this.ClientSize;
                    if (!this.Enabled) {
                        _g.DrawImageUnscaled(this._dpic, 0, 0, client.Width, client.Height);
                        return;
                    }
                    Image _pic = null;
                    switch (x) {
                        case 0:
                            _pic = this._npic;
                            break;
                        case 1:
                            _pic = this._apic;
                            break;
                        case 2:
                            _pic = this._ppic;
                            break;
                    }
                    if (_pic == null) { return; }
                    using (_pic = _pic.GetThumbnailImage(client.Width, client.Height, null, IntPtr.Zero)) {
                        _g.DrawImageUnscaled(_pic, 0, 0, client.Width, client.Height);
                    }
                }
            }; 
        }

        Image _npic, _apic, _ppic, _dpic;
        [Description("正常图片"), Category("界面"), DefaultValue(typeof(Image), "null"), Browsable(true)]
        public Image npic
        {
            get { return this._npic; }
            set { this._npic = value; }
        }
        [Description("点燃图片"), Category("界面"), DefaultValue(typeof(Image), "null"), Browsable(true)]
        public Image apic
        {
            get { return this._apic; }
            set { this._apic = value; }
        }
        [Description("按下图片"), Category("界面"), DefaultValue(typeof(Image), "null"), Browsable(true)]
        public Image ppic
        {
            get { return this._ppic; }
            set { this._ppic = value; }
        }
        [Description("禁止图片"), Category("界面"), DefaultValue(typeof(Image), "null"), Browsable(true)]
        public Image dpic 
        {
            get { return this._dpic; }
            set { this._dpic = value; }
        }
    }
}

// 上述代码不过只是简单的做一个图形按钮，此代码只做参考