為窗體添加 "最大化","最小化","還原"等 事件
????????????????????????????????????????????????????????????????????????????電子科技大學(xué)軟件學(xué)院03級(jí)02班 周銀輝

???? 在.Net3.0以前的版本中(Form類)都沒(méi)有與窗口最大化、最小化等相關(guān)的事件, 這讓人很郁悶. ( .Net3.0的Window類中添加了該事件"StateChanged "). 這里來(lái)重寫(xiě)Form類以便添加這幾個(gè)事件.

1, 參數(shù) WindowStateChangedEventArgs
/**////?<summary>
????///?包含窗口狀態(tài)變化時(shí)的相關(guān)數(shù)據(jù)
????///?</summary>
????public?class?WindowStateChangedEventArgs?:?EventArgs
????{
????????private?readonly?FormWindowState?oldState;
????????private?readonly?FormWindowState?newState;

????????public?FormWindowState?OldState
????????{
????????????get
????????????{
????????????????return?oldState;
????????????}
????????}


????????public?FormWindowState?NewState
????????{
????????????get
????????????{
????????????????return?newState;
????????????}
????????}

????????public?WindowStateChangedEventArgs(FormWindowState?oldState,?FormWindowState?newState)
????????{
????????????this.oldState?=?oldState;
????????????this.newState?=?newState;
????????}


????}
2, 繼承Form類并添加事件WindowStateChanged
using?System;
using?System.Collections.Generic;
using?System.ComponentModel;
using?System.Drawing;
using?System.Data;
using?System.Text;
using?System.Windows.Forms;

namespace?MDIHelper
{
????public?partial?class?CustomForm?:?Form
????{
????????//記錄狀態(tài)變化之前的狀態(tài)
????????private?FormWindowState?preWindowState?=?FormWindowState.Normal;

????????public?CustomForm()
????????{
????????????InitializeComponent();
????????}

????????事件#region?事件

????????/**////?<summary>
????????///?窗口狀態(tài)改變時(shí)發(fā)生
????????///?</summary>
????????public?event?EventHandler<WindowStateChangedEventArgs>?WindowStateChanged;

????????protected?virtual?void?OnWindowStateChanged(WindowStateChangedEventArgs?arg)
????????{
????????????if?(this.WindowStateChanged?!=?null)
????????????{
????????????????this.WindowStateChanged(this,?arg);
????????????}
????????}

????????#endregion


????????重寫(xiě)的方法#region?重寫(xiě)的方法???????

????????protected?override?void?WndProc(ref?Message?m)
????????{
????????????switch?(m.Msg)
????????????{
????????????????case?0x0005://change?size:?WM_SIZE
????????????????????{
????????????????????????FormWindowState?newState?=?FormWindowState.Normal;
????????????????????????switch?(m.WParam.ToInt32())
????????????????????????{
????????????????????????????case?0://SIZE_RESTORED
????????????????????????????????newState?=?FormWindowState.Normal;
????????????????????????????????break;
????????????????????????????case?1://SIZE_MINIMIZED
????????????????????????????????newState?=?FormWindowState.Minimized;
????????????????????????????????break;
????????????????????????????case?2://SIZE_MAXIMIZED
????????????????????????????????newState?=?FormWindowState.Maximized;
????????????????????????????????break;
????????????????????????????default:
????????????????????????????????break;
????????????????????????}

????????????????????????if?(newState?!=?this.preWindowState)
????????????????????????{
????????????????????????????this.OnWindowStateChanged(new?WindowStateChangedEventArgs(this.preWindowState,?newState));
????????????????????????????this.preWindowState?=?newState;
????????????????????????}
????????????????????}
????????????????????break;
????????????????default:
????????????????????break;
????????????}
????????????base.WndProc(ref?m);
????????}
????????#endregion
????}
}
其中最重要的部分是 protected override void WndProc(ref Message m) , 它捕獲了發(fā)給窗體的消息, 關(guān)于消息的常量值可以在winuser.h中找到,關(guān)于消息的具體含義可以在WindowsSDK中找到.
更多的, 你可以利用protected override void WndProc(ref Message m) 創(chuàng)建更多事件.

轉(zhuǎn)載于:https://www.cnblogs.com/zhouyinhui/archive/2007/01/12/619175.html

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