using System;
using System.Collections.Generic;
using System.Linq;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Runtime.InteropServices;
using System.Windows.Forms;
namespace VirtualKeyboard
{
static class Program
{
[STAThread]
static void Main()
{
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
Application.Run(new vkForm());
}
}
public class vkButton : Label
{
public vkButton(string text)
{
New(text, new Size(30, 30), new Font("tahoma", 12, FontStyle.Bold));
}
public vkButton(string text, Size size, Font font)
{
New(text, size, font);
}
public void New(string text, Size size, Font font)
{
this.Text = text; //设置控件的 Text 属性
this.Font = font; //控件所使用的字体
this.Size = size; //控件呈现的大小尺寸
//定义控件为自绘模式并使用双缓存
this.SetStyle(ControlStyles.AllPaintingInWmPaint | ControlStyles.UserPaint
| ControlStyles.OptimizedDoubleBuffer, true);
//添加鼠标事件响应事件
this.MouseUp += new MouseEventHandler(btnNormal);
this.MouseDown += new MouseEventHandler(btnPressed);
this.MouseLeave += new EventHandler(btnNormal);
this.MouseHover += new EventHandler(btnHover);
//实例化后默认常规状态的颜色
this.NormalColor = Color.LightSteelBlue;
this.HoverColor = Color.Orange;
this.PressedColor = Color.Red;
}
public Color HoverColor { set; get; } //鼠标激活时的颜色的属性
public Color NormalColor { set; get; } //正常状态的颜色的属性
public Color PressedColor { set; get; } //鼠标按下时的颜色的属性
private void btnNormal(object o, EventArgs e)
{
//这里绘画常规状态的控件界面
Graphics graphic = this.CreateGraphics(); //创建绘图对象
btnPaint(graphic, this.ForeColor, NormalColor); //绘画界面
graphic.Dispose(); //及时释放对象资源
}
private void btnHover(object o, EventArgs e)
{
//这里绘画鼠标激活时的控件界面
Graphics graphic = this.CreateGraphics();
btnPaint(graphic, this.ForeColor, HoverColor);
graphic.Dispose();
}
private void btnPressed(object o, EventArgs e)
{
//这里绘画鼠标按下后的控件界面
Graphics graphic = this.CreateGraphics();
btnPaint(graphic, this.ForeColor, PressedColor);
graphic.Dispose();
}
protected override void OnPaint(PaintEventArgs e)
{
btnPaint(e.Graphics, this.ForeColor, this.NormalColor);
}
/* 此方法用于根据传入的参数绘制控件界面*/
private void btnPaint(Graphics graphic, Color foreColor, Color backgroundColor)
{
graphic.Clear(this.BackColor); //以背景色清除图象
Color lightColor, darkColor; //定义高亮和暗部分的颜色
StringFormat textFormat = new StringFormat(); //用于设置文字格式
LinearGradientBrush brush; //定义渐变笔刷
Rectangle rect = new Rectangle(0, 0, this.Width - 1, this.Height - 1); //获取矩型区域
lightColor = Color.FromArgb(0, backgroundColor); //获取高亮颜色
darkColor = Color.FromArgb(255, backgroundColor); //获取暗颜色
//生成渐变笔刷实例
brush = new LinearGradientBrush(rect, lightColor, darkColor,
LinearGradientMode.BackwardDiagonal);
graphic.FillRectangle(brush, rect); //使用渐变画笔刷填充
graphic.DrawRectangle(new Pen(foreColor), rect); //使用前景色画边框
textFormat.Alignment = StringAlignment.Center; //设置文字垂直对齐方式
textFormat.LineAlignment = StringAlignment.Center; //设置文字水平对齐方式
//绘画控件显示的正文
graphic.DrawString(this.Text, this.Font, new SolidBrush(foreColor), rect, textFormat);
}
}
public static class Win32API
{
[DllImport("user32.dll", EntryPoint = "SendMessageW")]
public static extern int SendMessage(
int hwnd,
int wMsg,
int wParam,
int lParam);
[DllImport("user32.dll", EntryPoint = "PostMessageW")]
public static extern int PostMessage(
int hwnd,
int wMsg,
int wParam,
int lParam);
[DllImport("user32.dll")]
public static extern int GetForegroundWindow();
[DllImport("user32.dll")]
public static extern int GetFocus();
[DllImport("user32.dll")]
public static extern int AttachThreadInput(
int idAttach,
int idAttachTo,
int fAttach);
[DllImport("user32.dll")]
public static extern int GetWindowThreadProcessId(
int hwnd,
int lpdwProcessId);
[DllImport("kernel32.dll")]
public static extern int GetCurrentThreadId();
public const int WM_MOUSEACTIVATE = 0x21;
public const int WM_KEYDOWN = 0x100;
public const int MA_NOACTIVATE = 3;
public const int WS_EX_NOACTIVATE = 0x8000000;
}
public class vkForm : Form
{
private vkButton[] vk = new vkButton[36];
private vkButton btnExit;
private Point offset;
protected override void OnLoad(EventArgs e)
{
btnExit = new vkButton("Exit Sample");
btnExit.Dock = DockStyle.Bottom;
btnExit.Size = new Size(130, 30);
//先添加26个字母的虚拟按键
for (int i = 0; i < 26; i++)
{
//使用刚才建立的按钮类实例化每个虚拟按钮
//字母A对应ASCII代码为 65,即B为 66,如此类推
vk[i] = new vkButton(((char)(i + 65)).ToString());
}
//继续添加0-9的数字键
for (int i = 0; i < 10; i++)
{
//实例化各个数字的虚拟按钮,0 对应ASCII代码为 48
vk[26 + i] = new vkButton(((char)(i + 48)).ToString());
}
this.TopMost = true;
this.ControlBox = false;
this.Size = new Size(330, 180);
this.Controls.AddRange(vk); //加入所有的虚拟按键
this.Controls.Add(btnExit); //加入一个退出程序的按钮
int x = 10;
int y = 10;
for (int i = 0; i < vk.Length; i++)
{
vk[i].Click += btnCommon_Click; //为按钮添加事件响应
vk[i].Location = new Point(x, y);
x += 32 + 2;
if (x + 32 >= this.Width)
{
y += 32;
x = 10;
}
}
btnExit.Click += btnExit_Click; //为退出按钮添加事件响应
}
protected override void OnMouseMove(MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
Point offset = e.Location;
offset = this.PointToScreen(e.Location);
this.Left = offset.X - this.offset.X;
this.Top = offset.Y - this.offset.Y;
}
}
protected override void OnMouseDown(MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
offset = e.Location;
}
}
private void AttachThreadInput(bool b)
{
//设置线程亲和,附到前台窗口所在线程,只有在线程内才可以获取线程内控件的焦点
//线程亲和: AttachThreadInput(目标线程标识, 当前线程标识, 非零值关联) 零表示取消
//窗口所在的线程的标识: GetWindowThreadProcessId(窗体句柄, 这里返回进程标识)
//当前的前台窗口的句柄: GetForegroundWindow()
//当前程序所在的线程标识: GetCurrentThreadId()
Win32API.AttachThreadInput(
Win32API.GetWindowThreadProcessId(
Win32API.GetForegroundWindow(), 0),
Win32API.GetCurrentThreadId(), Convert.ToInt32(b));
}
private void btnCommon_Click(object o, EventArgs e)
{
AttachThreadInput(true); //设置线程亲和的关联
int getFocus = Win32API.GetFocus();
//o为object类型,使用强制转换成vkButton
char keyvalue = ((vkButton)o).Text.ToCharArray()[0];
//向前台窗口发送按键消息
Win32API.PostMessage(getFocus, Win32API.WM_KEYDOWN, (byte)keyvalue, 0);
AttachThreadInput(false); //取消线程亲和的关联
}
private void btnExit_Click(object o, EventArgs e)
{
Application.Exit();
}
protected override void WndProc(ref Message m)
{
base.WndProc(ref m);
//若在窗体上产生鼠标点击事件的消息则使消息返回值标记为不激活
//程序内部的窗口切换仅需返回 MA_NOACTIVATE 即可,若相对其它
//的程序窗口切换时 还需要设置 WS_EX_NOACTIVATE 样式
if (m.Msg == Win32API.WM_MOUSEACTIVATE)
m.Result = (IntPtr)Win32API.MA_NOACTIVATE;
//MA_ACTIVATE 激活窗体，但不删除鼠标消息。
//MA_NOACTIVATE 不激活窗体，也不删除鼠标消息。
//MA_ACTIVATEANDEAT 激活窗体，删除鼠标消息。
//MA_NOACTIVATE 不激活窗体，也不删除鼠标消息。
//MA_ACTIVATEANDEAT 激活窗体，删除鼠标消息。
//MA_NOACTIVATEANDEAT 不激活窗体，但删除鼠标消息。
}
protected override CreateParams CreateParams
{
get
{
CreateParams cp = base.CreateParams;
//为窗体样式添加不激活标识
cp.ExStyle = Win32API.WS_EX_NOACTIVATE;
return cp;
}
}
}
}
