在Windows Mobile中输入数字的最佳方法是什么？ （.NET CF 3.5）

Question

必须有一种比受约束的数字更新控件更好的方法。

Answer 1

在Windows Mobile（或常规Windows应用程序）中输入数字（尤其是非整数）的最简单方法是只有一个用户输入的文本框，然后验证它们是否已输入正确的号。

Windows Mobile中这种方法的问题在于默认的SIP（Soft Input Panel又名小弹出式键盘）如下所示：

alt text http://img510.imageshack.us/img510/6210/sipreg.jpg

在真正的Windows Mobile设备上，SIP看起来甚至比这还小，并且正确地击中顶部的小数字键是一个巨大的痛苦。您想要用于此目的的是数字模式，您可以通过单击左上角的“123”按钮获得该模式，如下所示：

alt text http://img16.imageshack.us/img16/6128/sipnum.jpg

问题在于，没有（简单）方式以编程方式使SIP的这种模式显示而不是常规键盘。要使SIP以数字模式显示，请将项目引用添加到 Microsoft.WindowsCE.Forms ，然后将此代码添加为名为“SIPHandler”的类（您必须更改名称空间）到项目的命名空间）：

using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;
using System.Drawing;
using Microsoft.WindowsCE.Forms;

namespace DeviceApplication1
{
    /// <summary>
    /// Handles showing and hiding of Soft Input Panel (SIP).  Better to use these
    /// methods than having an InputControl on a form.  InputControls behave oddly
    /// if you have multiple forms open.
    /// </summary>
    public class SIPHandler
    {
        public static void ShowSIP()
        {
            SipShowIM(1);
        }

        public static void ShowSIPNumeric()
        {
            SipShowIM(1);
            SetKeyboardToNumeric();
        }

        public static void ShowSIPRegular()
        {
            SipShowIM(1);
            SetKeyboardToRegular();
        }

        public static void HideSIP()
        {
            SipShowIM(0);
        }

        private static void SetKeyboardToRegular()
        {
            // Find the SIP window
            IntPtr hWnd = FindWindow("SipWndClass", null);
            // Go one level below as the actual SIP window is a child
            hWnd = GetWindow(hWnd, GW_CHILD);
            // Obtain its context and get a color sample
            // The premise here is that the numeric mode is controlled by a virtual button in the top left corner
            // Whenever the numeric mode is active, the button background will be of COLOR_WINDOW_TEXT
            IntPtr hDC = GetDC(hWnd);
            int pixel = GetPixel(hDC, 2, 2);
            // Notice that we cannot simply compare the color to the system color as the system color is 24 bit (or palette)
            // and the real color is dithered to 15-16 bits for most devices, so white (0xff, 0xff, 0xff) becomes
            // almost white (oxf8, 0xfc, 0xf8)

            // ken's hack:  here we only want to simulate the click if the keyboard is in numeric mode, in 
            // which case the back color will be WindowText
            //int clrText = (SystemColors.Window.R) | (SystemColors.Window.G << 8) | (SystemColors.Window.B << 16);
            int clrText = (SystemColors.WindowText.R) | (SystemColors.WindowText.G << 8) | (SystemColors.WindowText.B << 16);

            SetPixel(hDC, 2, 2, clrText);
            int pixelNew = GetPixel(hDC, 2, 2);
            // Restore the original pixel
            SetPixel(hDC, 2, 2, pixel);

            if (pixel == pixelNew)
            {
                // Simulate stylus click
                Message msg = Message.Create(hWnd, WM_LBUTTONDOWN, new IntPtr(1), new IntPtr(0x00090009));
                MessageWindow.SendMessage(ref msg);
                msg = Message.Create(hWnd, WM_LBUTTONUP, new IntPtr(0), new IntPtr(0x00090009));
                MessageWindow.SendMessage(ref msg);
            }
            // Free resources
            ReleaseDC(hWnd, hDC);
        }

        private static void SetKeyboardToNumeric()
        {
            // Find the SIP window
            IntPtr hWnd = FindWindow("SipWndClass", null);
            // Go one level below as the actual SIP window is a child
            hWnd = GetWindow(hWnd, GW_CHILD);
            // Obtain its context and get a color sample
            // The premise here is that the numeric mode is controlled by a virtual button in the top left corner
            // Whenever the numeric mode is active, the button background will be of COLOR_WINDOW_TEXT
            IntPtr hDC = GetDC(hWnd);
            int pixel = GetPixel(hDC, 2, 2);
            // Notice that we cannot simply compare the color to the system color as the system color is 24 bit (or palette)
            // and the real color is dithered to 15-16 bits for most devices, so white (0xff, 0xff, 0xff) becomes
            // almost white (oxf8, 0xfc, 0xf8)
            int clrText = (SystemColors.Window.R) | (SystemColors.Window.G << 8) | (SystemColors.Window.B << 16);
            SetPixel(hDC, 2, 2, clrText);
            int pixelNew = GetPixel(hDC, 2, 2);
            // Restore the original pixel
            SetPixel(hDC, 2, 2, pixel);

            if (pixel == pixelNew)
            {
                // Simulate stylus click
                Message msg = Message.Create(hWnd, WM_LBUTTONDOWN, new IntPtr(1), new IntPtr(0x00090009));
                MessageWindow.SendMessage(ref msg);
                msg = Message.Create(hWnd, WM_LBUTTONUP, new IntPtr(0), new IntPtr(0x00090009));
                MessageWindow.SendMessage(ref msg);
            }
            // Free resources
            ReleaseDC(hWnd, hDC);
        }

        [DllImport("coredll.dll")]
        private extern static bool SipShowIM(int dwFlag);

        [DllImport("coredll.dll")]
        private extern static IntPtr FindWindow(string wndClass, string caption);

        [DllImport("coredll.dll")]
        private extern static IntPtr GetWindow(IntPtr hWnd, int nType);

        [DllImport("coredll.dll")]
        private extern static int GetPixel(IntPtr hdc, int nXPos, int nYPos);

        [DllImport("coredll.dll")]
        private extern static void SetPixel(IntPtr hdc, int nXPos, int nYPos, int clr);

        [DllImport("coredll.dll")]
        private extern static IntPtr GetDC(IntPtr hWnd);

        [DllImport("coredll.dll")]
        private extern static void ReleaseDC(IntPtr hWnd, IntPtr hDC);

        [DllImport("coredll.dll")]
        private static extern bool SipSetCurrentIM(byte[] clsid);

        const int WM_LBUTTONDOWN = 0x0201;
        const int WM_LBUTTONUP = 0x0202;
        const int GW_CHILD = 5;

    }
}

抱歉长度。要在数字模式下弹出SIP，只需使用以下行：

SIPHandler.ShowSIPNumeric();

或使其以常规键盘模式显示：

SIPHandler.ShowSIPRegular();

再次隐藏它：

SIPHandler.HideSIP();

此代码背后的基本技巧是对左上角的颜色进行“窥视”以确定SIP是否已经处于常规键盘或数字模式，然后模拟鼠标单击（如果需要）相同的角落，以确保SIP处于所需的模式。

注意：这是“借来的”网络代码，但我不知道从哪里获得它。如果SO上有人知道这个黑客的来源，请告诉我，我很乐意将其归于原作者。

更新：好吧，经过2秒的Google搜索，我发现此代码的近似来源是Daniel Moth：

http://www.danielmoth.com/Blog/InputPanelEx.cs

......他将Alex Feinman归功于原作：

http://www.alexfeinman.com/download.asp?doc=IMSwitch.zip

谢谢，伙计们！这个代码实际上让我流泪一次（我当时正在切洋葱，但那不可能是它）。

Answer 2

MaskedTextBox可能有用。如果不这样做，我建议使用带有OnTextChange事件处理程序的普通TextBox，该处理程序检查以确保输入的值实际上是一个数字。任何非数字字符，您可以敲出一个消息框，或者根据您的需要完全删除这些字符。

NumericUpDown控件有时使用起来很慢，但是它们具有内部数据验证，在某些情况下非常有用。如果控件是用户不经常使用的控件，请考虑使用它。否则，MaskedTextBox或TextBox即可。

Answer 3

解决此问题的另一种方法是使用多级ContextMenu，其中第一层选项涵盖数字范围，第二层让用户选择特定值，如下所示：

alt text http://img19.imageshack.us/img19/6329/dropdowns.jpg

您可以提前创建完整的菜单结构（有点痛苦），或者根据值的范围和所需的分辨率动态加载结构。即使在Windows Mobile设备上，您也可以在不到一秒的时间内完成数百个菜单项。

这种方法也很适合输入货币价值。