Go homepage(回首页) Upload pictures (上传图片) Write articles (发文字帖)
The author:(作者)qqpublished in(发表于) 2014/7/11 9:22:47 C#教程:MouseDown和MouseUp事件
C#教程:MouseDown和MouseUp事件
MouseDown和MouseUp事件1.MouseDown事件当鼠标指针位于控件上并按下鼠标键时发生。语法:public event MouseEventHandler MouseDown参数说明如下。MouseEventHandler:表示将处理窗体、控件或其他组件的MouseDown、MouseUp或 MouseMove事件的方法。MouseEventHandler委托事件语法:public delegate void MouseEventHandler (Object sender,MouseEventArgs e)参数说明如下。sender:事件源。e:包含事件数据的MouseEventArgs。MouseEventArgs用来构造函数对数,其公共属性及说明如表1所示。表1 MouseEventArgs参数属性及说明示例MouseDown事件的使用本示例单击鼠标右键,弹出快捷菜单。示例运行结果如图1所示。图1 MouseDown事件的使用private void Form1_MouseDown(object sender, MouseEventArgs e){OnMouseDown = True;if (e.Button == MouseButtons.Right){this.contextMenuStrip1.Show(this, new Point(e.X, e.Y));}}完整程序代码如下:★ ★★★★frmMouse.cs窗体代码文件完整程序代码★★★★★using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Text;using System.Windows.Forms;namespace _2_05{public partial class frmMouse : Form{public frmMouse(){InitializeComponent();}public bool G_OnMouseDown = false;public Point lastPoint = Point.Empty;public string G_str_color = "black";public Pen pen;public Graphics graphics;//当你拖拽鼠标处理的和序,当没有上一点时,你目当所按下的点就是上一个点//目当所按下的点就是CurrPoint,使用您所选反背景色画笔pen从lastPointi画一条直线,然后将//上一个点LastPoint的值设为目前点currPointprivate void Form1_MouseMove(object sender, MouseEventArgs e){}//当鼠标离开时把布尔变量设为false;private void Form1_MouseUp(object sender, MouseEventArgs e){G_OnMouseDown = false;}//将布尔变量OnMouseDown设为true 按下鼠标右键时显示菜单private void Form1_MouseDown(object sender, MouseEventArgs e){G_OnMouseDown = true;if (e.Button == MouseButtons.Right){this.contextMenuStrip1.Show(this, new Point(e.X, e.Y));}}private void frmMouse_Load(object sender, EventArgs e){}}}★ ★★★★frmMouse..Designer.cs窗体设计文件完整程序代码★★★★★namespace _2_05{partial class frmMouse{/// /// 必需的设计器变量。/// private System.ComponentModel.IContainer components = null;/// /// 清理所有正在使用的资源。/// /// 如果应释放托管资源,为 true;否则为 false。protected override void Dispose(bool disposing){if (disposing && (components != null)){components.Dispose();}base.Dispose(disposing);}#region Windows 窗体设计器生成的代码/// /// 设计器支持所需的方法 - 不要/// 使用代码编辑器修改此方法的内容。/// private void InitializeComponent(){this.components = new System.ComponentModel.Container();this.contextMenuStrip1 = new System.Windows.Forms.ContextMenuStrip(this.components);this.blackToolStripMenuItem = new System.Windows.Forms.ToolStripMenuItem();this.whiteToolStripMenuItem = new System.Windows.Forms.ToolStripMenuItem();this.redToolStripMenuItem = new System.Windows.Forms.ToolStripMenuItem();this.greenToolStripMenuItem = new System.Windows.Forms.ToolStripMenuItem();this.blueToolStripMenuItem = new System.Windows.Forms.ToolStripMenuItem();this.contextMenuStrip1.SuspendLayout();this.SuspendLayout();//// contextMenuStrip1//this.contextMenuStrip1.Items.AddRange(new System.Windows.Forms.ToolStripItem[] {this.blackToolStripMenuItem,
赞