.Net Micro Framework研究—让MF支持英文输入法

一旦支持了鼠标功能,MF可研究的领域,似乎变得无穷无尽,这也许是我近几天一直陷于此中不能自拔的原因了。
有了鼠标即使没有键盘,我们也可以通过虚拟键盘完成输入工作。这个工作很有意义,也很有挑战性,因为这不是windows平台,也不是Dos平台,这是“一穷二白”的MF平台,所有的工作都得从头做起(实现绘制键盘,向有输入焦点控件发送按键信息,删除,添加字符等等功能)。
目前字符串不仅无法转换为数字,并且没有字符插入功能,所以这个函数也必须自己来实现,此外输入焦点光标也需要自己绘制,好了,先不说难处了,先看看最终成果。
 .Net Micro Framework研究—让MF支持英文输入法

这是一个文本输入实例,当文本框有输入焦点时,自动弹出输入面板。
.Net Micro Framework研究—让MF支持英文输入法

虚拟键盘上的“Shift”键也是有效的,切换后可以输入符号和大写字母。
.Net Micro Framework研究—让MF支持英文输入法
 
当文本框失去输入焦点的时候,虚拟键盘消失。
 
以上应用实现的代码如下:

    //个人信息
    public class YFSelfInfo : YFDialog
    {
        YFLabel[] label=new YFLabel[3];
        YFText[] text=new YFText[3];
        string[] strLabelName = new string[] {"姓名:","单位:","博客:"};
        public YFSelfInfo(string Title, int Left, int Top, int Width, int Height, YFWindowBase Parent): base(Title, Width, Height, Parent)
        {
            //-------------
            for(int i=0;i<3;i++)
            {
                label[i] = new YFLabel(strLabelName[i], 20, ClientRect.Top + 10+30*i,40, 20);
                Children.Add(label[i]);
                text[i] = new YFText("", 70, label[i].Top, 140, 20);
                text[i].Enter += new YFSoft.SPOT.Presentation.YFEventHandler(text_Enter);
                text[i].Leave += new YFSoft.SPOT.Presentation.YFEventHandler(text_Leave);
                Children.Add(text[i]);
            }
        }
        //获得输入焦点时显示输入面板
        void text_Leave(object sender, EventArgs e)
        {
            HideInputPanel();
            this.Height = SystemMetrics.ScreenHeight;
        }
        //失去焦点时隐藏输入面板
        void text_Enter(object sender, EventArgs e)
        {
            ShowInputPanel();
            this.Height = this.InputPanelTop + 1;
        }
        //主窗体鼠标信息
        public override void OnMouseClick(object sender, MouseEventArgs e)
        {
            text_Leave(null, null); //隐藏输入面板
            base.OnMouseClick(sender, e);
        }
}

用户程序是不是很简单?再看看我实现的一个记事本程序
.Net Micro Framework研究—让MF支持英文输入法

正在输入界面
.Net Micro Framework研究—让MF支持英文输入法
 

菜单功能支持
 
相关代码如下:

    //记事本
    public class YFNote : YFDialog
    {
        YFText text;
        public YFNote(string Title,int Left, int Top, int Width, int Height, YFWindowBase Parent)
            : base(Title, Width, Height, Parent)
        {
            text = new YFText("", ClientRect.Left, ClientRect.Top, ClientRect.Width, ClientRect.Height);
            text.BorderStyle = BorderStyle.None;
            text.Align = false;
            text.Enter += new YFSoft.SPOT.Presentation.YFEventHandler(text_Enter);
            text.Leave += new YFSoft.SPOT.Presentation.YFEventHandler(text_Leave);
            Children.Add(text);
            this.Left = Left;
            this.Top = Top;
            Menu.AddItem(new MenuItem("新建"));
            Menu.AddItem(new MenuItem("保存"));
            Menu.AddItem(new MenuItem("-"));
            Menu.AddItem(new MenuItem("退出"));               
        }
        //获得输入焦点时显示输入面板
        void text_Leave(object sender, EventArgs e)
        {
            HideInputPanel();
            this.Height = SystemMetrics.ScreenHeight;
            text.Height = ClientRect.Height;
        }
        //失去焦点时隐藏输入面板
        void text_Enter(object sender, EventArgs e)
        {
            ShowInputPanel();
            this.Height = this.InputPanelTop+1;
            text.Height = ClientRect.Height;
        }
        //主窗体鼠标信息
        public override void OnMouseClick(object sender, MouseEventArgs e)
        {
            text_Leave(null, null); //隐藏输入面板
            base.OnMouseClick(sender, e);
        }
        //菜单
        public override void OnMenuClick(MenuEventArgs e)
        {
            switch (e.Text)
            {
                case "新建":
                    text.Text = "";
                    break;
                case "保存":
                    MessageBox("不好意思,暂时没有保存功能","记事本", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                    break;
                case "退出":
                    Close();
                    break;
            }
            base.OnMenuClick(e);
        }
 }

程序也超简单,但功能还是蛮强大的,我们下面看看虚拟键盘的相关代码,实现思路和鼠标功能一样,也是直接借助基类的虚拟函数,向指定的窗体和控件发送按键消息。
核心代码如下:

public void TransactKey(KeyState state, object sender, MouseEventArgs e)
    {
        //向控件发送按键消息
        if (this.Parent != null)
        {
            Keys key = Keys.None;
            int keyValue=0;
            char _char = (char)0;
 
            YFButton b = (YFButton)sender;
            if (b.Text == "" || b.Text=="En" || b.Text=="Cn") return;
 
            Button btn = Button.None;
            switch (b.Text)
            {
                case "Tab":
                    key = Keys.Tab;
                    break;
                case "Caps":
                    key = Keys.CapsLock;
                    break;
                case "Shift":
                    key = Keys.Select;
                    break;
                case "Ent":
                    key = Keys.Enter;
                    btn = Button.Select;
                    break;
                case "Esc":
                    key = Keys.Escape;
                    break;
                case "Ins":
                    key = Keys.Insert;
                    break;
                case "Del":
                    key = Keys.Delete;
                    break;
                case "Menu":
                    key = Keys.Menu;
                    btn = Button.Menu;
                    break;
                case "↑":
                    key = Keys.Up;
                    btn = Button.Up;
                    break;
                case "←":
                    key = Keys.Left;
                    btn = Button.Left;
                    break;
                case "↓":
                    key = Keys.Down;
                    btn = Button.Down;
                    break;
                case "→":
                    key = Keys.Right;
                    btn = Button.Right;
                    break;
                case "<-":
                    key = Keys.Back;
                    btn = Button.Back;
                    break;
                default:
                    _char = b.Text[0];
                    key = (Keys)b.Name[0];
                    break;
            }
            keyValue = (int)key;
 
            //向当前有输入焦点的窗口发送系统按键消息
            if (btn!= Button.None)
            {
                if ((state & KeyState.Down) > 0) Parent.GetFocus().OnButtonDownEx(new ButtonEventArgs(null, null, new TimeSpan(), btn));
                if ((state & KeyState.Up) > 0) Parent.GetFocus().OnButtonUpEx(new ButtonEventArgs(null, null, new TimeSpan(), btn));                   
            }
 
            //获得输入焦点的控件
            YFControl c = this.Parent.Children.GetFocus();
            if (c != null)
            {
                if ((state & KeyState.Down) > 0) c.OnKeyDown(sender, new KeyEventArgs(key, keyValue, button[41].Checked, button[28].Checked, button[55].Checked));
                if ((state & KeyState.Press) > 0 && _char != (char)0) c.OnKeyPress(sender, new KeyPressEventArgs(_char));
                if ((state & KeyState.Up) > 0) c.OnKeyUp(sender, new KeyEventArgs(key, keyValue, button[41].Checked, button[28].Checked, button[55].Checked));
            }
 
            //父窗体要求接收按键消息
            if (Parent.KeyPreview)
            {
                if ((state & KeyState.Down) > 0) Parent.OnKeyDown(Parent, new KeyEventArgs(key, keyValue, button[41].Checked, button[28].Checked, button[55].Checked));
                if ((state & KeyState.Press) > 0 && _char != (char)0) Parent.OnKeyPress(Parent, new KeyPressEventArgs(_char));
                if ((state & KeyState.Up) > 0) Parent.OnKeyUp(Parent, new KeyEventArgs(key, keyValue, button[41].Checked, button[28].Checked, button[55].Checked));
            }
        }
}

   以上仅仅实现的是英文输入,中文输入怎么做?似乎要困难的多,此外粘贴、复制功能要不要做?总之有很多很多的东西值得我们去探索去实现,这一切,似乎我们在走Microsoft的老路,要在MF平台上实现一个Micro Windows!说到这我想到一个笑话,有一个人给上帝进行打赌说他也能造人。上帝问他,你怎么做,他说,我先用泥土捏一个…,“等等,”上帝打断了他,“你要用你自己的泥土”。

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