(一)C# Windows Mobile 半透明窗体
leslie_xin 人气:2Windows Mobile,个人心中臻至完美的系统。
不忍自己对WM的钻研成果消逝,故留作纪念。
系列开篇,便是一个曾令自己困扰很久的问题:如何实现半透明窗体。
如果了解Win32编程,其实很简单。
主要用到了三个方法:
SetLayeredWindowAttributes
GetWindowLong
SetWindowLong
核心代码:
1 private void SetWindowTransparent(byte bAlpha) 2 { 3 SetWindowLong(this.Handle, (int)WindowStyle.GWL_EXSTYLE, 4 GetWindowLong(this.Handle, (int)WindowStyle.GWL_EXSTYLE) | (uint)ExWindowStyle.WS_EX_LAYERED); 5 6 SetLayeredWindowAttributes(this.Handle, 0, bAlpha, LWA_ALPHA); 7 }
效果:
完整代码:
1 using System; 2 3 using System.Collections.Generic; 4 using System.ComponentModel; 5 using System.Data; 6 using System.Drawing; 7 using System.Text; 8 using System.Windows.Forms; 9 using System.Runtime.InteropServices; 10 11 namespace Demo01 12 { 13 public partial class Form1 : Form 14 { 15 public Form1() 16 { 17 InitializeComponent(); 18 } 19 20 [DllImport("coredll.dll")] 21 public extern static IntPtr GetDesktopWindow(); 22 23 [DllImport("coredll.dll")] 24 public extern static bool SetLayeredWindowAttributes(IntPtr hwnd, uint crKey, byte bAlpha, uint dwFlags); 25 public static uint LWA_COLORKEY = 0x00000001; 26 public static uint LWA_ALPHA = 0x00000002; 27 28 [DllImport("coredll.dll")] 29 public extern static uint SetWindowLong(IntPtr hwnd, int nIndex, uint dwNewLong); 30 [DllImport("coredll.dll")] 31 public extern static uint GetWindowLong(IntPtr hwnd, int nIndex); 32 33 public enum WindowStyle : int 34 { 35 GWL_EXSTYLE = -20 36 } 37 38 public enum ExWindowStyle : uint 39 { 40 WS_EX_LAYERED = 0x00080000 41 } 42 43 private void SetWindowTransparent(byte bAlpha) 44 { 45 try 46 { 47 SetWindowLong(this.Handle, (int)WindowStyle.GWL_EXSTYLE, 48 GetWindowLong(this.Handle, (int)WindowStyle.GWL_EXSTYLE) | (uint)ExWindowStyle.WS_EX_LAYERED); 49 50 SetLayeredWindowAttributes(this.Handle, 0, bAlpha, LWA_ALPHA); 51 52 } 53 catch 54 { 55 } 56 } 57 58 private void button1_Click(object sender, EventArgs e) 59 { 60 this.Close(); 61 } 62 63 private void trackBar1_ValueChanged(object sender, EventArgs e) 64 { 65 label1.Text = "透明度(0~255): " + trackBar1.Value.ToString(); 66 SetWindowTransparent(Convert.ToByte(trackBar1.Value)); 67 } 68 69 private void Form1_Load(object sender, EventArgs e) 70 { 71 Rectangle rf = Screen.PrimaryScreen.WorkingArea; 72 73 this.Location = new Point((rf.Width - this.Width) / 2, (rf.Height - this.Height) / 2); 74 75 //SetWindowTransparent(136); 76 } 77 } 78 }
工程文件:
https://files.cnblogs.com/files/lesliexin/01.%E5%8D%8A%E9%80%8F%E6%98%8E%E7%AA%97%E4%BD%93.7z
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