本篇内容介绍了“C#怎么实现短消息提示窗口位置及窗口大小”的有关知识,在实际案例的操作过程中,不少人都会遇到这样的困境,接下来就让小编带领大家学习一下如何处理这些情况吧!希望大家仔细阅读,能够学有所成!
一 短消息提示
短消息提示Toast:
用于呈现一条短消息,提示完成后即可自动消失;
特点:
① 弹出式窗口;
② 短文本,可以折行显示;
③ 根据文本长度,自动调整大小;
④ 约1.5后,自动消失;
二 弹出窗口
在Winform中,所有的窗口都用Form实现,比如:
① 常规窗口Window;
② 对话框窗口Dialog;
③ 悬浮窗口FloatWindow;
④ 工具提示Tooltip;
⑤ 弹出式窗口Popup(如菜单窗口、下拉列表窗口);
自定义一个Form类,即可定义一个窗口
public class myToast:Form{}
本窗口不需要边框,位置和大小都是自己控制的。
创建并显示窗口
myToast toast=new myToast();toast.ShowMessage("This is a totas!");
子窗体代码
using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Drawing.Drawing2D;using System.Drawing.Text;using System.Linq;using System.Runtime.InteropServices;using System.Text;using System.Threading.Tasks;using System.Windows.Forms;namespace 弹窗提示{ public partial class Toast : Form { private string message; public Toast() { //无边框 this.FormBorderStyle = FormBorderStyle.None; //背景白色 this.BackColor = Color.White; } public void ShowMessage(string message) { this.message = message; //手动指定位置 this.StartPosition = FormStartPosition.Manual; this.Location = new Point(0, 0); this.Size = new Size(300, 100); //显示窗口 this.Show(); } protected override void OnPaint(PaintEventArgs e) { base.OnPaint(e); Graphics g = e.Graphics; int w = this.Width, h = this.Height; Rectangle rect = new Rectangle(0, 0, w, h); rect.Inflate(-4, -4); //平滑绘制,反锯齿 g.SmoothingMode = SmoothingMode.HighQuality; g.TextRenderingHint = TextRenderingHint.AntiAliasGridFit; if(message!=null) { StringFormat sf = new StringFormat(); sf.Alignment = StringAlignment.Center; sf.LineAlignment = StringAlignment.Center; Brush brush = new SolidBrush(Color.Black); g.DrawString(message, this.Font, brush, rect, sf); brush.Dispose(); } } }}
父窗体代码
using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Threading.Tasks;using System.Windows.Forms;namespace 弹窗提示{ public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void button1_Click(object sender, EventArgs e) { Toast toast = new Toast(); toast.ShowMessage("This is a toast!"); } }}
三 窗口位置
toast窗口显示时,相当于主窗口位置居中。
① 找到主窗口,得到主窗口的位置;
② 计算toast窗口的位置;
toast窗口显示时,不剥夺主窗口的焦点,需要重写ShowWithoutActivation
protected override bool ShowWithoutActivation{ get { return true; }}
1 要点与细节
① 已知一个控件Control,可以得到它所在的窗口;
Form form=ctrl.FindForm();
子窗体代码:
using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Drawing.Drawing2D;using System.Drawing.Text;using System.Linq;using System.Text;using System.Threading.Tasks;using System.Windows.Forms;namespace 窗口位置{ public partial class Toast : Form { private string message; public Toast() { this.FormBorderStyle = FormBorderStyle.None; this.BackColor = Color.White; this.ShowInTaskbar = false; } //owner 可以是子窗口也可以是控件 public void ShowMessage(Control owner,string message) { this.message = message; this.StartPosition = FormStartPosition.Manual; this.Size = new Size(300, 100); //找到owner所在的顶级窗口 Form form = owner.FindForm(); this.Owner = form; //使toast窗口相对主窗口居中 Rectangle fr = new Rectangle(form.Location, form.Size); int x = fr.X + (fr.Width - this.Width) / 2; int y = fr.Y + (fr.Width - this.Height) / 2; this.Location = new Point(x, y); this.Show(); } //焦点控制:本窗口不剥夺主窗口的焦点 //否则,当toast窗口激活时,主窗口焦点被剥夺 protected override bool ShowWithoutActivation { get { return true; } } protected override void OnPaint(PaintEventArgs e) { base.OnPaint(e); Graphics g = e.Graphics; int w = this.Width, h = this.Height; Rectangle rect = new Rectangle(0, 0, w, h); rect.Inflate(-4, -4); //平滑绘制,反锯齿 g.SmoothingMode = SmoothingMode.HighQuality; g.TextRenderingHint = TextRenderingHint.AntiAliasGridFit; if(message!=null) { StringFormat sf = new StringFormat(); sf.Alignment = StringAlignment.Center; sf.LineAlignment = StringAlignment.Center; Brush brush = new SolidBrush(Color.Black); g.DrawString(message, this.Font, brush, rect, sf); brush.Dispose(); } } }}
父窗体代码
using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Threading.Tasks;using System.Windows.Forms;namespace 窗口位置{ public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void button1_Click(object sender, EventArgs e) { Toast toast = new Toast(); toast.ShowMessage(button1, "中国人民解放军!"); } }}
四 窗口大小
Toast的窗口的大小,应该根据消息长度来调整,比如:
toast.ShowMessage(button1,"成功");toast.ShowMessage(button1,"思密达");toast.ShowMessage(button1,"编程是一种艺术");
使用Graphics.MeasureString()可以测算文本的尺寸
Graphics g=this.CreateGraphics();SizeF size=g.MeasureString(str,this.Font,300);g.Dispose();
注意,临时创建的Graphics用完之后需要手工销毁。
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