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本篇內容介紹了“C#怎么實現短消息提示窗口位置及窗口大小”的有關知識,在實際案例的操作過程中,不少人都會遇到這樣的困境,接下來就讓小編帶領大家學習一下如何處理這些情況吧!希望大家仔細閱讀,能夠學有所成!
短消息提示Toast:
用于呈現一條短消息,提示完成后即可自動消失;
特點:
① 彈出式窗口;
② 短文本,可以折行顯示;
③ 根據文本長度,自動調整大小;
④ 約1.5后,自動消失;
在Winform中,所有的窗口都用Form實現,比如:
① 常規窗口Window;
② 對話框窗口Dialog;
③ 懸浮窗口FloatWindow;
④ 工具提示Tooltip;
⑤ 彈出式窗口Popup(如菜單窗口、下拉列表窗口);
自定義一個Form類,即可定義一個窗口
public class myToast:Form { }
本窗口不需要邊框,位置和大小都是自己控制的。
創建并顯示窗口
myToast toast=new myToast(); toast.ShowMessage("This is a totas!");
子窗體代碼
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 彈窗提示 { public partial class Toast : Form { private string message; public Toast() { //無邊框 this.FormBorderStyle = FormBorderStyle.None; //背景白色 this.BackColor = Color.White; } public void ShowMessage(string message) { this.message = message; //手動指定位置 this.StartPosition = FormStartPosition.Manual; this.Location = new Point(0, 0); this.Size = new Size(300, 100); //顯示窗口 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); //平滑繪制,反鋸齒 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(); } } } }
父窗體代碼
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 彈窗提示 { 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!"); } } }
toast窗口顯示時,相當于主窗口位置居中。
① 找到主窗口,得到主窗口的位置;
② 計算toast窗口的位置;
toast窗口顯示時,不剝奪主窗口的焦點,需要重寫ShowWithoutActivation
protected override bool ShowWithoutActivation { get { return true; } }
① 已知一個控件Control,可以得到它所在的窗口;
Form form=ctrl.FindForm();
子窗體代碼:
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所在的頂級窗口 Form form = owner.FindForm(); this.Owner = form; //使toast窗口相對主窗口居中 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(); } //焦點控制:本窗口不剝奪主窗口的焦點 //否則,當toast窗口激活時,主窗口焦點被剝奪 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); //平滑繪制,反鋸齒 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(); } } } }
父窗體代碼
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, "中國人民解放軍!"); } } }
Toast的窗口的大小,應該根據消息長度來調整,比如:
toast.ShowMessage(button1,"成功"); toast.ShowMessage(button1,"思密達"); toast.ShowMessage(button1,"編程是一種藝術");
使用Graphics.MeasureString()可以測算文本的尺寸
Graphics g=this.CreateGraphics(); SizeF size=g.MeasureString(str,this.Font,300); g.Dispose();
注意,臨時創建的Graphics用完之后需要手工銷毀。
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