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;
}
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;