Button控件双击事件不执行
Button控件双击事件不执行
最近组态组新加入了一位同事,该同事原先是做ASP.NET的,没有做过WindowForm的开发。所以就先安排一个小示例来测验一下。这个示例有些年头了,当年我进入组态开发时候,总监也是安排了这个示例来入门_。
需求是这样的:
- 双击软件界面空白处,出现一个按钮,该按钮可以拉伸和移动
- 可修改按钮内的文字描述
- 下次打开软件,还是上一次的布局
大概一天时间,界面是这样的:
代码是这样的:
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;
using System.IO;
namespace WinFormTest1
{
public partial class FormButtonTest : System.Windows.Forms.Form
{
public FormButtonTest()
{
InitializeComponent();
}
private int i=1;
private Control downCtrl;
private Point downLoc;
bool ctrlMove;
bool ctrlZoom;
public static string str = "";
private void FormButtonTest_MouseDoubleClick(object sender, MouseEventArgs e)
{
Button btn = new Button();
btn.Name = "btn" + i.ToString();
btn.Text = "Button"+i.ToString();
btn.Location = e.Location;
btn.Cursor = Cursors.Default;
this.Controls.Add(btn);
btn.MouseDown += new MouseEventHandler(this.btn_MouseDown);
btn.MouseUp += new MouseEventHandler(this.btn_MouseUp);
btn.MouseMove += new MouseEventHandler(this.btn_MouseMove);
btn.Click += new EventHandler(this.btn_Click);
i++;
}
private void btn_MouseDown(object sender, MouseEventArgs e)
{
downCtrl = sender as Control;
downLoc = e.Location;
if (downCtrl.Cursor == Cursors.SizeAll)
{
ctrlMove = true;
ctrlZoom = false;
}
else if (downCtrl.Cursor == Cursors.SizeNESW || downCtrl.Cursor == Cursors.SizeNS || downCtrl.Cursor == Cursors.SizeNWSE || downCtrl.Cursor == Cursors.SizeWE)
{
ctrlMove = false;
ctrlZoom = true;
}
}
private void btn_MouseUp(object sender, MouseEventArgs e)
{
Control control = sender as Control;
//if ((e.Button == MouseButtons.Left) && ctrlZoom)
//{
// control.Width += e.X - downLoc.X;
// control.Height += e.Y - downLoc.Y;
//}
ctrlMove = false;
ctrlZoom = false;
}
private void btn_MouseMove(object sender, MouseEventArgs e)
{
Control control = sender as Control;
Point p1 = PointToClient(Control.MousePosition);
int x = p1.X;
int y = p1.Y;
if (x >= control.Right - 10 && x <= control.Right + 10 && y >= control.Bottom - 10 && y <= control.Bottom + 10) //右下角
{
control.Cursor = Cursors.SizeNWSE;
}
else if (x >= control.Left + 10 && x <= control.Right - 10 && y >= control.Bottom - 10 && y <= control.Bottom + 10) //下边界
{
control.Cursor = Cursors.SizeNS;
}
else if (x >= control.Right - 10 && x <= control.Right + 10 && y >= control.Top + 10 && y <= control.Bottom - 10) //右边界
{
control.Cursor = Cursors.SizeWE;
}
else if (x >= control.Left - 10 && x <= control.Right + 10 && y >= control.Top - 10 && y <= control.Top + 10)
{
control.Cursor = Cursors.SizeAll;
}
else if (x > control.Left + 10 && x < control.Right - 10 && y > control.Top + 10 && y < control.Bottom - 10)
{
control.Cursor = Cursors.Default;
}
if ((e.Button == MouseButtons.Left) && ctrlMove)
{
int pos_x, pos_y;
pos_x = downCtrl.Location.X + (e.X - downLoc.X);
pos_y = downCtrl.Location.Y + (e.Y - downLoc.Y);
control.Location = new Point(pos_x, pos_y);
}
if ((e.Button == MouseButtons.Left) && ctrlZoom)
{
int width = x - downCtrl.Location.X;
int height = y - downCtrl.Location.Y;
control.Width = control.Cursor == Cursors.SizeNS ? control.Width : (width > 0 ? width : 1);
control.Height = control.Cursor == Cursors.SizeWE ? control.Height : (height > 0 ? height : 1);
}
}
public void formChild_accept(object sender, EventArgs e)
{
//事件的接收者通过一个简单的类型转换得到Form的引用
FormChild formChild = (FormChild)sender;
str = formChild.FormChildValue;
//MessageBox.Show(str);
}
private void btn_Click(object sender, EventArgs e)
{
Control control = sender as Control;
if ((control.Cursor == Cursors.Default) && !ctrlMove && !ctrlZoom)
{
FormChild formChild = new FormChild();
formChild.FormChildValue = control.Text;
formChild.accept += new EventHandler(formChild_accept);
formChild.ShowDialog(this);
control.Text = str;
}
}
private void FormButtonTest_FormClosing(object sender, FormClosingEventArgs e)
{
FileStream fs = new FileStream(@"../../a.txt", FileMode.Create);
StreamWriter sw = new StreamWriter(fs);
foreach (Control ctrl in this.Controls)
{
sw.WriteLine(ctrl.Name + "|" + ctrl.Text + "|" + ctrl.Top + "|" + ctrl.Left + "|" + ctrl.Width + "|" + ctrl.Height + "|" + i);
}
sw.Flush();
sw.Close();
fs.Close();
}
private void FormButtonTest_Load(object sender, EventArgs e)
{
if (File.Exists(@"../../a.txt"))
{
StreamReader sr = new StreamReader(@"../../a.txt", Encoding.Default);
string lineString;
while ((lineString = sr.ReadLine()) != null)
{
string[] line = lineString.Split('|');
Button btn = new Button();
btn.Name = line[0];
btn.Text = line[1];
btn.Top = int.Parse(line[2]);
btn.Left = int.Parse(line[3]);
btn.Width = int.Parse(line[4]);
btn.Height = int.Parse(line[5]);
i = int.Parse(line[6]);
btn.Cursor = Cursors.Default;
this.Controls.Add(btn);
btn.MouseDown += new MouseEventHandler(this.btn_MouseDown);
btn.MouseUp += new MouseEventHandler(this.btn_MouseUp);
btn.MouseMove += new MouseEventHandler(this.btn_MouseMove);
btn.Click += new EventHandler(this.btn_Click);
}
sr.Close();
}
}
}
}
总体来看也勉勉强强,但我对于代码有点洁癖,不简洁的代码就不是好代码,严于律己,对其他人就不强求。讲解了一下其中的不足之处。
- 可进行移动的按钮区域做在边框上,不友好,很难点到可以移动。
- 修改描述的部分,确定和取消的逻辑没有区分开。
- 修改描述的窗体没有居中显示
然后又提出了新的需求,需求总是会变的嘛。
- 保存的文本改为Json格式
- 加入能够双击新建文本控件,并且也可以拖动和拉伸
- 修改文本描述,改为双击执行修改
- 移动控件,但不能超出软件界面
然后又过了一天,我再次审查,该同事跟我说了一下,他遇到的几个困难
- 如何确定什么时候需要新建文本控件
- 按钮的双击事件不起作用
对于第一个问题,我给了一个方案,你可以使用两个事先确定的两个按钮功能,点新建文本控件按钮的时候,那么后面双击空白界面的时候就新建出文本控件来,如果点了新建按钮控件的那个按钮,则后面双击空白界面的时候就新建出按钮控件。
第二个问题,该同事是找到解决方案的,解决按钮的双击事件不起作用。
using System;
using System.Collections.Generic;
using System.Text;
using System.Windows.Forms;
namespace WinFormTest1
{
public class ButtonEx : Button
{
public new event EventHandler DoubleClick;
DateTime clickTime;
bool isClicked = false;
protected override void OnClick(EventArgs e)
{
base.OnClick(e);
if (isClicked)
{
TimeSpan span = DateTime.Now - clickTime;
if (span.TotalMilliseconds < SystemInformation.DoubleClickTime)
{
DoubleClick(this, e);
isClicked = false;
}
else
{
isClicked = true;
clickTime = DateTime.Now;
}
}
else
{
isClicked = true;
clickTime = DateTime.Now;
}
}
}
}
看了还是略显复杂了,但最终也是解决了问题。其实对于这个问题,有一个简单的处理即可。
public class ButtonEx:Button
{
public ButtonEx()
{
this.SetStyle(ControlStyles.StandardClick | ControlStyles.StandardDoubleClick, true);
}
}
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