最大化MDI子窗体

本文关键字:窗体 MDI 最大化 | 更新日期: 2023-09-27 18:19:36

我正在开发一个遗留的WinForms MDI应用程序,在使子窗体按我想要的方式运行时遇到了一些问题。我的目标是使子窗体始终最大化(停靠)。

问题是,即使我将MaximizeBox设置为false,最大化/调整大小按钮也会出现在MDI工具中,并允许用户调整(取消固定)子窗体的大小。避免这种情况的唯一方法是将ControlBox设置为false,但关闭按钮消失为(这不是我想要的)。

我已经尝试过使用固定的FormBorderStyle,并在触发resize事件时最大化子窗体,但我的方法都不起作用。

我错过了什么超级秘密的财产吗?还是根本不可能?

谨致问候;提前感谢

更新

我写了一个处理我的孩子表格的肮脏方法(感谢@rfresia),它可能会帮助其他遇到同样问题的人:

//All child forms derive from ChildForm
//Parent MDI Form implementation
//...
private void ShowForm(ChildForm form)
{
    //Check if an instance of the form already exists
    if (Forms.Any(x => x.GetType() == form.GetType()))
    {
        var f = Forms.First(x => x.GetType() == form.GetType());
        f.Focus();
        f.WindowState = FormWindowState.Maximized;
    }
    else
    {
        //Set the necessary properties (any other properties are set to default values)
        form.MdiParent = this;
        form.MaximizeBox = false;
        form.MinimizeBox = false;
        form.WindowState = FormWindowState.Maximized;
        Forms.Add(form);
        form.Forms = Forms;
        form.Show();
        form.Focus();
        //Lets make it nasty (some forms aren't rendered properly otherwise)
        form.WindowState = FormWindowState.Normal;
        form.WindowState = FormWindowState.Maximized;
    }
}
//...
//ChildForm implementation
//...
public List<Form> Forms { get; set; }
protected override void OnClosing(System.ComponentModel.CancelEventArgs e)
{
    Forms.RemoveAll(x => x.GetType() == GetType());
}
protected override void OnResize(EventArgs e)
{
    WindowState = FormWindowState.Maximized;
}

最大化MDI子窗体

这个问题不容易解决,但我意外地找到了答案,而且很简单;默认情况下,将子窗体的窗口状态设置为"正常"。然后确保在调用Show()方法后重置子窗口的窗口状态。

示例:

private void ShowNewForm(object sender, EventArgs e)
{
  Form childForm = new Form();
  childForm.MdiParent = this;
  childForm.Text = "Window " + childFormNumber++;
  childForm.Show();
  childForm.WindowState = FormWindowState.Maximized;
}

您可以覆盖每个要确保不会最小化的子窗体的OnResize。或者创建一个BaseForm并从中继承所有子窗体。

protected override void OnResize(EventArgs e)
{
   this.WindowState = FormWindowState.Maximized;
}

此外,您可以使用X,y坐标,但OnResize应该足够了。将其放入子窗体构造函数:

   this.WindowState = FormWindowState.Maximized;
   Point NewLoc = Screen.FromControl(this).WorkingArea.Location;
   //Modifiy the location so any toolbars & taskbar can be easily accessed.
   NewLoc.X += 1;
   NewLoc.Y += 1;
   this.Location = NewLoc;
   Size NewSize = Screen.FromControl(this).WorkingArea.Size;
   //Modifiy the size so any toolbars & taskbar can be easily accessed.
   NewSize.Height -= 1;
   NewSize.Width -= 1;
   this.Size = NewSize;
   this.MinimumSize = this.Size;
   this.MaximumSize = this.MinimumSize;

我从这里得到了X,Y的代码:http://bytes.com/topic/c-sharp/answers/278649-how-do-i-prevent-form-resizing

form1 obj = new form1 ();
obj.MdiParent = MDIGracular.ActiveForm;
obj.StartPosition = FormStartPosition.CenterParent;
obj.WindowState = FormWindowState.Minimized;
obj.Dock = DockStyle.Fill;
obj.Show();
obj.WindowState = FormWindowState.Maximized;

这就是我克服同样问题的方法,我不记得在哪里找到了代码。

private const int WM_SYSCOMMAND = 0x112;
private const int SC_MINIMIZE = 0xF020;
private const int SC_MAXIMIZE = 0xF030;
private const int SC_CLOSE = 0xF060;
private const int SC_RESTORE = 0xF120;
protected override void WndProc(ref Message msg)
{
  if ((msg.Msg == WM_SYSCOMMAND) && 
    (((int)msg.WParam == SC_MINIMIZE) || ((int)msg.WParam == SC_MAXIMIZE) ||
    ((int)msg.WParam == SC_CLOSE)) || ((int)msg.WParam == SC_RESTORE))
    {
      //do nothing
    } // end if
    else
    {
      base.WndProc(ref msg);
     } // end else
}

在我的应用程序中,我发现如果我只在表单加载的事件中放这两行,它就可以工作了。感谢sarvjeet的基本想法+1为您

this.WindowState = FormWindowState.Minimized;
this.WindowState = FormWindowState.Maximized;