[英]Paint or Hide Control Box for Borderless Form while maximize and minimize
I've attached a small example about the issue. 我已附上一个有关此问题的小例子。 How can I hide the control box completely during Maximize and Minimize the Borderless Form 在最大化和最小化无边界表单期间如何完全隐藏控制框
using System.Windows.Forms;
using System.Runtime.InteropServices;
using System.Security;
using System.Threading;
namespace TalkTime
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private const int WM_NCPAINT = 0x0085;
protected override void WndProc(ref Message m)
{
int message = m.Msg;
switch (m.Msg)
{
case WM_NCPAINT:
{
Thread.Sleep(100);
return;
}
}
base.WndProc(ref m);
}
protected override CreateParams CreateParams
{
get
{
CreateParams cp = base.CreateParams;
cp.Style |= 0x20000;
return cp;
}
}
}
}
I put the thread to show where is the problem exactly. 我把线程显示出确切的问题出在哪里。
The black rectangle which is I guess related to the controlbox and form name will appear before the form while I want to hide it completely while maximizing and minimizing. 我想与控制箱和表单名称有关的黑色矩形会出现在表单之前,而我想在最大化和最小化时完全隐藏它。
I can confirm the issue. 我可以确认这个问题。 When restoring a border-less Form
from minimized state, a ghost of a title-bar shows at top-left of the window for a very short time. 从最小化状态还原无边界Form
,很短的时间在窗口的左上方会显示标题栏的重影。
Reproducing the issue 重现问题
To reproduce the problem, it's enough to create a border-less form by setting FormBorderStyle
property to None
and then minimize and restore it in a timer. 要重现该问题,只需将FormBorderStyle
属性设置为None
,然后在计时器中最小化和还原它,即可创建无边界表单。 Start the program by showing the form and look at top-left of the window, after restore. 还原后,显示表单启动程序,并在窗口的左上方查看。
using System;
using System.Windows.Forms;
class Form1 : Form
{
public Form1()
{
var timer = new Timer() { Interval = 1000 };
this.Text = "Some Text";
this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None;
timer.Tick += (x, y) =>
{
if (this.WindowState != FormWindowState.Minimized)
this.WindowState = FormWindowState.Minimized;
else
this.WindowState = FormWindowState.Normal;
};
timer.Start();
}
}
Workaround 解决方法
Here is the workaround which I used to remove that flicker. 这是我用来消除闪烁的解决方法。 It's enough to add the event handler to above Form1
class and register it for Activated
event this.Activated += Form1_Activated;
将事件处理程序添加到上面的Form1
类中并为Activated
事件注册它this.Activated += Form1_Activated;
. 。
private void Form1_Activated(object sender, EventArgs e)
{
if (this.WindowState == FormWindowState.Minimized)
this.Hide();
this.BeginInvoke(new Action(() =>
{
if (this.WindowState != FormWindowState.Minimized && !Visible)
this.Show();
}));
}
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