.Net Mirco Framework 2007技术大会

.Net Mirco Framework 2007技术大会

2006年在《程序员》杂志上通过看马宁的专栏文章，第一次知道了.Net MF。一年后的今天终于近距离地接触了.Net Mirco Frmaework，对MF有了一定的感性认识。

最近公司很多项目都有大量嵌入式设备使用，由于WinCE系统相对较大，对硬件平台要求过高，所以对.Net MF一直比较关注。今天总算大开眼界了。

微软公司的Colin Miller和Digi公司的John Leier在上午的演讲拉开了.Net MF序幕，针对嵌入式领域，一个从软件角度进行阐述，另一个从硬件平台角度进行呼应，一软一硬，二者强强联合，恐怕未来嵌入式智能设备一半以上的项目开发要被其收入囊中了。下午的中文演讲给人感觉有些干瘪，两三个演讲，平均短短十几分钟就草草收场。后来微软公司杜伟的演讲，从VS2005一行行难以看清的代码，到一个个令人惊艳的样例把MF开发技术推向最前台。

Digi公司很是有魄力，免费送出15套开发套件（5个作为回答问题的奖品，10个抽奖），自己即没有回答问题的勇气，也没有好的运气，只好剩下羡慕的份了。

最后为每个人送出的1G优盘（类似微软今年MVP大礼包中的优盘）很有分量，不仅是1G的容量，并且里面竟然把所有的幻灯片拷贝其中，更没有想到的是，MF 的SDK也在里面，真棒！

回到家迫不及待装了一份MF SDK（MicroFrameworkSDK.MSI 区区只有5998 kb，强！），有模拟器，也有示例。

其中几个示例不知道为什么编译成功，就是运行失败，对第二示例比较感兴趣，可以绘制图形，并且可以贴图。

相关代码如下：

// Copyright(C)MicrosoftCorporation.Allrightsreserved.

using System;
using System.Collections;
using System.Threading;

using Microsoft.SPOT;
using Microsoft.SPOT.Input;
using Microsoft.SPOT.Hardware;
using Microsoft.SPOT.Presentation;
using Microsoft.SPOT.Presentation.Media;
using Microsoft.SPOT.Presentation.Controls;
using Microsoft.SPOT.Presentation.Shapes;

using PresentationDemo;


/**/ //////////////////////////////////////////////////////////////////////////////


public sealed class MyApp:Application ... {
//ThisstaticfieldpreventstheobjectfrombeingGC'd
privatestaticGpioButtonInputProviders_gpioInputProvider;

publicFontNinaBFont;
publicFontSmallFont;
publicBitmapSnowflake;

privateMyApp()...{
//InitializetheButtons/Pinsdispatcher
s_gpioInputProvider=newGpioButtonInputProvider(this.Dispatcher,null);

//Loadsomeresources
NinaBFont=Resources.GetFont(Resources.FontResources.NinaBFont);
SmallFont=Resources.GetFont(Resources.FontResources.SmallFont);
Snowflake=Resources.GetBitmap(Resources.BitmapResources.Snowflake);
}

protectedoverridevoidOnStartup(EventArgse)...{
//Createandsettheapplication'smainwindow
this.MainWindow=newMainMenuWindow(this);
base.OnStartup(e);
}

publicvoidGoHome()...{
Buttons.Focus(this.MainWindow);//Setfocusbacktothemainwindow
}

publicstaticvoidMain()...{
newMyApp().Run();//Starttheapp'smainwindow
}
}


/**/ //////////////////////////////////////////////////////////////////////////////


// Thisisthebaseclassofallourwindows;itmakeseverywindowvisible,
// setsthewindow'ssizetothefullsizeoftheLCD,andgivethewindowfocus
internal class PresentationWindow:Window ... {
protectedMyAppm_app;

protectedPresentationWindow(MyAppapp)...{
m_app=app;

//MakethewindowvisibleandthesizeoftheLCD
this.Visibility=Visibility.Visible;
this.Width=SystemMetrics.ScreenWidth;
this.Height=SystemMetrics.ScreenHeight;
Buttons.Focus(this);//Setfocustothiswindow
}

protectedoverridevoidOnButtonDown(ButtonEventArgse)...{
//RemovethiswindowformtheWindowManager
this.Close();

//Whenanybuttonispressed,gobacktotheHomepage
m_app.GoHome();
}
}

/**/ //////////////////////////////////////////////////////////////////////////////


internal sealed class MainMenuWindow:PresentationWindow ... {
privateListBoxm_listbox;

publicListBoxMainListBox...{get...{returnm_listbox;}}

publicMainMenuWindow(MyAppapp)
:base(app)...{

ColorinstructionTextColor=ColorUtility.ColorFromRGB(192,192,192);
ColorbackgroundColor=ColorUtility.ColorFromRGB(26,118,183);
ColorunselectedItemColor=ColorUtility.ColorFromRGB(192,192,255);//Unselectedlistboxitemcolor
ColorselectedItemColor=Colors.White;//Selectedlistboxitemcolor

//TheMainwindowcontainsaveritcalStackPanel
StackPanelpanel=newStackPanel(Orientation.Vertical);
this.Child=panel;

//Thetopchildcontainstextwithinstructions
TextFlowtextflow=newTextFlow();
textflow.TextAlignment=TextAlignment.Center;
textflow.Visibility=Visibility.Visible;
textflow.TextRuns.Add(
newTextRun(Resources.GetString(Resources.StringResources.SelectAnItemFromBelow),
app.NinaBFont,instructionTextColor));
panel.Children.Add(textflow);

//Addablanklinetothestack
panel.Children.Add(textflow=newTextFlow());
textflow.TextRuns.Add("",app.NinaBFont,instructionTextColor);
textflow.Visibility=Visibility.Visible;

//Thenextchildcontainsalistboxwithoptions
m_listbox=newListBox();

//Preparethelistbox
Buttons.Focus(m_listbox);
panel.Children.Add(m_listbox);
this.Background=m_listbox.Background=newSolidColorBrush(backgroundColor);

m_listbox.SelectionChanged+=delegate(Objectsender,SelectionChangedEventArgse)...{
Int32previousSelectedIndex=e.PreviousSelectedIndex;
if(previousSelectedIndex!=-1)...{//Iftherewasapreviousindex
//Changepreviously-selectedlistboxitemcolortounselectedcolor
((Text)m_listbox.Items[previousSelectedIndex].Child).ForeColor=unselectedItemColor;
}

//Changenewly-selectedlistboxitemcolortoselectedcolor
((Text)m_listbox.Items[e.SelectedIndex].Child).ForeColor=selectedItemColor;
};

//Addtheitemstothelistbox
foreach(StringsinnewString[]...{"VerticalStack","HorizontalStack","Canvas","Diagonal"})...{
Texttext=newText(m_app.NinaBFont,s+"PanelDemo");
text.ForeColor=unselectedItemColor;
text.TextAlignment=TextAlignment.Center;
text.Width=this.Width;
ListBoxItemlbi=newListBoxItem();
lbi.Background=m_listbox.Background;
lbi.Child=text;
m_listbox.Items.Add(lbi);
}
m_listbox.SelectedIndex=0;

//Addablanklineinthestack
panel.Children.Add(textflow=newTextFlow());
textflow.TextRuns.Add("",app.NinaBFont,instructionTextColor);
textflow.Visibility=Visibility.Visible;

//Thebottomchildcontainstextwithreturninstructions
textflow=newTextFlow();
textflow.TextAlignment=TextAlignment.Center;
textflow.Visibility=Visibility.Visible;
textflow.TextRuns.Add(
newTextRun("(AfterviewingaPanelDemo,hitEntertoreturntothisscreen)",
app.NinaBFont,instructionTextColor));
panel.Children.Add(textflow);
}

protectedoverridevoidOnButtonDown(ButtonEventArgse)...{
//If<Enter>buttonispressed,gointotheselecteddemo
if(e.Button==Button.Select)...{
switch(MainListBox.SelectedIndex)...{
case0://VerticalStackPanelDemo
newStackPanelDemo(m_app,Orientation.Vertical);
break;
case1://HorizontalStackPanelDemo
newStackPanelDemo(m_app,Orientation.Horizontal);
break;
case2://CanvasPanelDemo
newCanvasPanelDemo(m_app);
break;
case3://DiagonalPanelDemo
newDiagonalPanelDemo(m_app);
break;
}
}

//Don'tcallbaseimplementation(base.OnButtonDown)orwe'llgobackHome
}

protectedoverridevoidOnGotFocus(FocusChangedEventArgse)...{
//Wheneverthiswindowgetsfocus,itgivesittoitslistbox
Buttons.Focus(m_listbox);
base.OnGotFocus(e);
}
}


/**/ //////////////////////////////////////////////////////////////////////////////


internal sealed class StackPanelDemo:PresentationWindow ... {
//ThisclassshowshowtobuildyourownshapedrawinginaDrawingContext
privatesealedclassCross:Shape...{
publicCross()...{}

publicoverridevoidOnRender(DrawingContextdc)...{
//Drawalinefromtop,lefttobottom,right
dc.DrawLine(base.Stroke,0,0,Width,Height);

//Drawalinefromtop,righttobottom,left
dc.DrawLine(base.Stroke,Width,0,0,Height);
}
}

publicStackPanelDemo(MyAppapp,Orientationorientation)
:base(app)...{
StackPanelpanel=newStackPanel(orientation);
this.Child=panel;
panel.Visibility=Visibility.Visible;

Shape[]shapes=newShape[]...{
newEllipse(),
newLine(),
newPolygon(newInt32[]...{0,0,50,0,50,50,0,50}),//ASquare
newRectangle(),
newCross()//Ourowncustomshape
};

for(Int32x=0;x<shapes.Length;x++)...{
Shapes=shapes[x];
s.Fill=newSolidColorBrush(ColorUtility.ColorFromRGB(0,255,0));
s.Stroke=newPen(Color.Black,2);
s.Visibility=Visibility.Visible;
s.HorizontalAlignment=HorizontalAlignment.Center;
s.VerticalAlignment=VerticalAlignment.Center;
s.Height=Height-1;
s.Width=Width-1;

if(panel.Orientation==Orientation.Horizontal)
s.Width/=shapes.Length;
else
s.Height/=shapes.Length;

panel.Children.Add(s);
}
}
}


/**/ //////////////////////////////////////////////////////////////////////////////


internal sealed class CanvasPanelDemo:PresentationWindow ... {
publicCanvasPanelDemo(MyAppapp)
:base(app)...{
Canvascanvas=newCanvas();
this.Child=canvas;
this.Background=newSolidColorBrush(ColorUtility.ColorFromRGB(0,255,255));

for(Int32x=0;x<Width;x+=Width/4)...{
for(Int32y=0;y<Height;y+=Height/4)...{
Texttext=newText(m_app.SmallFont,"("+x+","+y+")");
Canvas.SetLeft(text,x);
Canvas.SetTop(text,y);
canvas.Children.Add(text);
}
}
}
}


/**/ //////////////////////////////////////////////////////////////////////////////


internal sealed class DiagonalPanelDemo:PresentationWindow ... {
publicDiagonalPanelDemo(MyAppapp)
:base(app)...{
DiagonalPanelpanel=newDiagonalPanel();
this.Child=panel;
this.Background=newLinearGradientBrush(
ColorUtility.ColorFromRGB(192,0,0),ColorUtility.ColorFromRGB(32,0,0),0,0,Width,Height);

for(Int32x=0;x<4;x++)...{
Bitmapb=newBitmap(Width/4,Height/4);
b.StretchImage(0,0,app.Snowflake,b.Width,b.Height,(UInt16)((x+1)*50));
Imageimage=newImage(b);
panel.Children.Add(image);
}
}

//ThisclassshowshowtobuildyourownPanel
privatesealedclassDiagonalPanel:Panel...{
publicDiagonalPanel()...{
}

protectedoverridevoidMeasureOverride(intavailableWidth,intavailableHeight,outintdesiredWidth,outintdesiredHeight)...{
//Calledtocalculatethewidth/heightdesired
desiredWidth=0;
desiredHeight=0;
foreach(UIElementchildinChildren)...{
if(child.Visibility!=Visibility.Collapsed)...{
child.Measure(Int32.MaxValue,Int32.MaxValue);
Int32childWidth,childHeight;
child.GetDesiredSize(outchildWidth,outchildHeight);
desiredWidth+=childWidth;
desiredHeight+=childHeight;
}
}
}

protectedoverridevoidArrangeOverride(intarrangeWidth,intarrangeHeight)...{
Int32x=0,y=0;
foreach(UIElementchildinChildren)...{
if(child.Visibility!=Visibility.Collapsed)...{
Int32childWidth,childHeight;
child.GetDesiredSize(outchildWidth,outchildHeight);
child.Arrange(x,y,childWidth,childHeight);
x+=childWidth;
y+=childHeight;
}
}
}
}
}


/**/ //////////////////////////////////////////////////////////////////////////////

后记：此外在会上还遇到了我的偶像马宁、马琪、张欣（还是张欣强，通过回答问题获得一个MF开放套件），如果他们不介意附上照片作个留念:-)