我在 C# 中开发小型应用程序，但我遇到了事件问题。我的表单具有描述当前应用程序状态的 controlState 属性。当应用程序处于 SEARCH 状态并且我按下回车键时，它同时执行 KeyDown_Search 和 KeyDown_Idle 方法。当我添加 MessageBox.Show("anything"); 在 KeyDown_eventManager 问题结束时不存在 - 它只执行 KeyDown_Search 方法。
我能做些什么来解决这个问题？
enum ControlState {NO_SHOW, IDLE, SEARCH}
private ControlState controlState;
protected override void OnShown(EventArgs e)
{
this.controlState = ControlState.IDLE;
this.KeyDown += new KeyEventHandler(KeyDown_eventManager);
}
void KeyDown_eventManager(object sender, KeyEventArgs e)
{
switch (this.controlState)
{
case ControlState.SEARCH:
this.KeyDown_Search(sender, e);
break;
case ControlState.NO_SHOW:
case ControlState.IDLE:
this.KeyDown_Idle(sender, e);
break;
}
}
void KeyDown_Search(object sender, KeyEventArgs e)
{
switch (e.KeyCode)
{
case Keys.Enter:
this.textContent = this.db.searchList(this.textSearch);
this.textSearch = null;
this.controlState = ControlState.IDLE;
break;
}
this.draw();
}
void KeyDown_Idle(object sender, KeyEventArgs e)
{
switch (e.KeyCode)
{
case Keys.Enter:
this.controlState = ControlState.NO_SHOW;
break;
}
this.draw();
}
更新：我添加了所有应用程序代码。也许它有助于找到解决方案。
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using dbConnector;
using DX = Microsoft.DirectX;
using D3D = Microsoft.DirectX.Direct3D;
namespace dbConnector
{
public class dbText
{
public dbText()
{
}
public string searchList(string keyword)
{
return "there will be connection to db";
}
}
}
namespace Rzutnik
{
enum ControlState
{
NO_SHOW, IDLE, SEARCH
}
public partial class Display : Form
{
private D3D.Device device;
private dbText db;
private ControlState controlState;
private D3D.Font textFont;
private D3D.Font textSearchFont;
private Rectangle textRect;
private int textPosition;
private bool textScrollingUp;
private int textJump;
private Timer textScrollingTimer;
private Timer textAutocomplete;
private int textScrollingTimerInterval;
private string textContent;
private string textSearch = null;
public Display()
{
InitializeComponent();
this.controlState = ControlState.IDLE;
this.InitializeDb();
this.InitializeDevice();
this.textInitialize();
this.KeyDown += new KeyEventHandler(KeyDown_eventManager);
this.KeyUp += new KeyEventHandler(KeyUp_eventManager);
this.KeyPress += new KeyPressEventHandler(KeyPress_eventManager);
this.Paint += new PaintEventHandler(DisplayPaint);
this.ResizeEnd += new EventHandler(DisplayResizeEnd);
}
protected void InitializeDb()
{
this.db = new dbText();
}
protected void InitializeDevice()
{
D3D.PresentParameters presentParams = new D3D.PresentParameters();
presentParams.BackBufferFormat = D3D.Format.R5G6B5;
presentParams.Windowed = true;
presentParams.SwapEffect = D3D.SwapEffect.Discard;
this.device = new D3D.Device(0, D3D.DeviceType.Hardware, this, D3D.CreateFlags.SoftwareVertexProcessing, presentParams);
}
void KeyDown_eventManager(object sender, KeyEventArgs e)
{
switch (this.controlState)
{
case ControlState.SEARCH:
this.KeyDown_Search(sender, e);
break;
case ControlState.NO_SHOW:
this.KeyDown_Idle(sender, e);
break;
case ControlState.IDLE:
this.KeyDown_Idle(sender, e);
break;
}
//MessageBox.Show("anything");
}
void KeyUp_eventManager(object sender, KeyEventArgs e)
{
switch (this.controlState)
{
case ControlState.NO_SHOW:
case ControlState.IDLE:
this.KeyUp_Idle(sender, e);
break;
}
}
void KeyPress_eventManager(object sender, KeyPressEventArgs e)
{
switch (this.controlState)
{
case ControlState.NO_SHOW:
case ControlState.IDLE:
case ControlState.SEARCH:
this.KeyPress_Idle_Search(sender, e);
break;
}
}
void KeyDown_Idle(object sender, KeyEventArgs e)
{
switch (e.KeyCode)
{
case Keys.Up:
if (this.textScrollingTimer.Enabled == true)
return;
this.textStartScrollingUp();
break;
case Keys.Down:
if (this.textScrollingTimer.Enabled == true)
return;
this.textStartScrollingDown();
break;
case Keys.Enter:
this.controlState = ControlState.NO_SHOW;
break;
}
this.draw();
}
void KeyUp_Idle(object sender, KeyEventArgs e)
{
base.OnKeyDown(e);
switch (e.KeyCode)
{
case Keys.Up:
case Keys.Down:
this.textStopScrolling();
break;
}
this.draw();
}
void KeyDown_Search(object sender, KeyEventArgs e)
{
e.Handled = true;
switch (e.KeyCode)
{
case Keys.Enter:
this.textContent = this.db.searchList(this.textSearch);
this.textSearch = null;
this.controlState = ControlState.IDLE;
System.Threading.Thread.Sleep(50);
break;
case Keys.Back:
this.textSearch = this.textSearch.Substring(0, this.textSearch.Length - 1);
this.textAutocomplete.Stop();
this.textAutocomplete.Start();
if (this.textSearch.Length == 0)
this.controlState = ControlState.IDLE;
break;
}
this.draw();
}
void KeyPress_Idle_Search(object sender, KeyPressEventArgs e)
{
if (e.KeyChar != 8 && e.KeyChar != 13)
{
this.textSearch += e.KeyChar;
this.textAutocomplete.Stop();
this.textAutocomplete.Start();
this.controlState = ControlState.SEARCH;
}
}
public void drawSearch()
{
this.device.BeginScene();
this.textSearchFont.DrawText(null, this.textSearch, new Point(10, this.ClientSize.Height - 10 - 9), Color.Red);
this.device.EndScene();
}
public void drawText()
{
device.BeginScene();
this.textFont.DrawText(null, this.textContent, this.textRect, D3D.DrawTextFormat.WordBreak, Color.White);
device.EndScene();
}
public void draw()
{
device.Clear(D3D.ClearFlags.Target, Color.Black, 1.0f, 0);
switch (this.controlState)
{
case ControlState.IDLE:
this.drawText();
break;
case ControlState.SEARCH:
this.drawText();
this.drawSearch();
break;
}
device.Present();
}
void DisplayResizeEnd(object sender, EventArgs e)
{
this.textInitializeRectangleSize();
this.draw();
}
void DisplayPaint(object sender, PaintEventArgs e)
{
this.draw();
}
private void textInitialize()
{
this.textPosition = 0;
this.textJump = 3;
this.textContent = null;
this.textAutocomplete = new Timer();
this.textAutocomplete.Interval = 100;
this.textAutocomplete.Tick += new System.EventHandler(textAutocomplete_Tick);
this.textScrollingTimer = new Timer();
this.textScrollingTimerInterval = 1;
this.textScrollingTimer.Interval = this.textScrollingTimerInterval;
this.textScrollingTimer.Tick += new System.EventHandler(textScrollingTimer_Tick);
this.textInitializeRectangleSize();
this.textInitializeFont();
}
void textAutocomplete_Tick(object sender, System.EventArgs e)
{
this.textContent = this.db.searchList(this.textSearch.Trim());
this.textAutocomplete.Stop();
this.draw();
}
private void textInitializeRectangleSize()
{
this.textRect = new Rectangle(10, 10 + this.textPosition, this.ClientSize.Width - 20, this.ClientSize.Height - 20 + this.textPosition);
}
private void textInitializeFont()
{
System.Drawing.Font systemfont1 = new System.Drawing.Font("Arial", 12f, FontStyle.Regular);
System.Drawing.Font systemfont2 = new System.Drawing.Font("Arial", 9f, FontStyle.Regular);
this.textFont = new D3D.Font(this.device, systemfont1);
this.textSearchFont = new D3D.Font(this.device, systemfont2);
}
void textScrollingTimer_Tick(object sender, System.EventArgs e)
{
if (this.textScrollingUp == true)
this.textPosition -= this.textJump;
else
this.textPosition += this.textJump;
this.textInitializeRectangleSize();
this.draw();
}
private void textStartScrollingUp()
{
this.textScrollingUp = true;
this.textScrollingTimer.Start();
}
private void textStartScrollingDown()
{
this.textScrollingUp = false;
this.textScrollingTimer.Start();
}
private void textStopScrolling()
{
this.textScrollingTimer.Stop();
}
}
}