.Net Micro Framework研究—让MF支持鼠标

MF的标准模块仅支持按键，并不支持鼠标功能。但是对一些常见应用来说，如果没有鼠标(或触摸屏)用起来就太不习惯了。有什么办法可以让MF支持鼠标功能呢？第一，外部设备必须把鼠标信息传到MF应用程序，应用程序根据这些信息绘制鼠标及执行相应的动作。鼠标信息最少包含三种，鼠标按键状态（按下或放开），鼠标坐标（x，y）。

目前，Spi通道可以非常方便地建立设备和用户程序之间的联系，所以就考虑用Spi来实现该功能。

第一步，还是从我编写的模拟器入手，添加了一个Spi驱动类。

//MouseDevice

public class MouseComponent : SpiDevice

{

public static Int16 State = 0;

public static Int16 X = 0;

public static Int16 Y = 0;

protected override byte[] Write(byte[] data)

{

//------------

//改写坐标值

try

{

//State = (Int16)((data[0] << 8) + data[1]);

//X = (Int16)((data[2] << 8) + data[3]);

//Y = (Int16)((data[4] << 8) + data[5]);

}

catch { }

//------------

//返回当前值

byte[] bytes = new byte[6];

bytes[0] = (byte)(State >> 8);

bytes[1] = (byte)(State & 0xff);

bytes[2] = (byte)(X >> 8);

bytes[3] = (byte)(X & 0xff);

bytes[4] = (byte)(Y >> 8);

bytes[5] = (byte)(Y & 0xff);

return bytes;

}

protected override ushort[] Write(ushort[] data)

{

//------------

//改写坐标值

try

{

//State = (Int16)data[0];

//X = (Int16)data[1];

//Y = (Int16)data[2];

}

catch { }

//------------

//返回当前值

ushort[] Int16s = new ushort[3];

Int16s[0] = (ushort)State;

Int16s[1] = (ushort)X;

Int16s[2] = (ushort)Y;

return Int16s;

}

}

第二步：编写鼠标应用程序

为了通用，我封装了一个windowbase基类

//鼠标事件

public class MouseEventArgs : EventArgs

{

public int X;

public int Y;

public int Button;

public MouseEventArgs()

{

X = 0;

Y = 0;

Button = 0;

State = MouseState.None;

}

public MouseEventArgs(int x, int y)

{

X = x;

Y = y;

Button = 0;

State = MouseState.None;

}

public MouseEventArgs(int x, int y, int button)

{

X = x;

Y = y;

Button = button;

State = MouseState.None;

}

}

//窗体基类

internal class WindowBase : Window

{

protected YFWinApp m_app;

Thread MouseThread;

private ushort state=0, x = 0, y = 0;

SPI _spi=null;

protected WindowBase(YFWinApp app)

{

m_app = app;

this.Visibility = Visibility.Visible;

this.Width = SystemMetrics.ScreenWidth;

this.Height = SystemMetrics.ScreenHeight;

Buttons.Focus(this);

//SPI的pin定义

_spi = new SPI(new SPI.Configuration((Cpu.Pin)127, true, 0, 0, false, false, 4000, SPI.SPI_module.SPI1));

x =(ushort)( this.Width/2);

y =(ushort)( this.Height/2);

MouseThread = new Thread(new ThreadStart(MouseInfo));

MouseThread.Start();

}

protected override void OnButtonDown(ButtonEventArgs e)

{

this.Close();

m_app.GoHome();

}

//获得鼠标信息

private void MouseInfo()

{

ushort[] bout = new ushort[3];

ushort[] bin = new ushort[3];

ushort mX, mY, mState;

while (true)

{

//----------------------------------

//通过spi通道获取鼠标信息这部分信息解析和模拟器相对应

_spi.WriteRead(bout, bin);

mState = bin[0]; //鼠标的状态1- 按下 0 - 放开

mX = bin[1]; //鼠标X坐标

mY = bin[2]; //鼠标Y坐标

//----------------------------------

if (x != mX|| y != mY)

{

x = mX; y = mY;

OnMouseMove(new MouseEventArgs(mX, mY, mState));

}

if (state != mState)

{

state = mState;

if (state == 1)

{

OnMouseDown(new MouseEventArgs(mX, mY, mState));

}

else if(state==0)

{

OnMouseUp(new MouseEventArgs(mX, mY, mState));

OnMouseClick(new MouseEventArgs(mX, mY, mState));

}

}

}

}

//鼠标移动

protected virtual void OnMouseMove(MouseEventArgs e)

{

Debug.Print("MouseMove:" + e.X.ToString() + "," + e.Y.ToString() + "," + e.Button.ToString());

}

//鼠标单击

protected virtual void OnMouseClick(MouseEventArgs e)

{

Debug.Print("MouseClick:" + e.X.ToString() + "," + e.Y.ToString() + "," + e.Button.ToString());

}

//按下

protected virtual void OnMouseDown(MouseEventArgs e)

{

Debug.Print("MouseDown:" + e.X.ToString() + "," + e.Y.ToString() + "," + e.Button.ToString());

}

//抬起

protected virtual void OnMouseUp(MouseEventArgs e)

{

Debug.Print("MouseUp:" + e.X.ToString() + "," + e.Y.ToString() + "," + e.Button.ToString());

}

//绘制鼠标

public override void OnRender(DrawingContext dc)

{

if (state == 1)

{

Pen pp=new Pen(ColorUtility.ColorFromRGB(255,255,0));

dc.DrawLine(pp, x, y - 5, x, y + 5);

dc.DrawLine(pp, x-5, y, x+5, y);

}

int[] points = { x, y, x+10, y+4, x+5,y+5, x+4,y+10};

Pen p = new Pen(Color.White, 1);

dc.DrawPolygon(null, p, points);

}

//窗体刷新

protected void Refresh()

{

this.Left = this.Left;

this.UpdateLayout();

}

}

下面是我们实际运行的效果图，已经非常完美的支持鼠标了（并且模拟器可两种方式提供鼠标信息，一种是鼠标直接在LCD屏上操作，一种是通过扩展面板上的滑块进行移动）。

直接用外部鼠标操作。

通过滑块进行鼠标操作。