[英]ElementHost flickers black borders on resize
Disclaimer : This is not a duplicated post. 免责声明 :这不是重复的帖子。 I googled about the issue.
我用Google搜索了这个问题。 Also read this , this and this SO questions.
还读这个 , 这个和这个 SO问题。 I tried some of those things but nothing seemed to help.
我尝试了其中的一些东西,但似乎没有任何帮助。
Consider the following simple example code. 请考虑以下简单示例代码。 It's just an empty ElementHost inside a WinForm (no WPF control inside):
它只是WinForm中的一个空ElementHost(内部没有WPF控件):
using System.Windows.Forms;
using System.Windows.Forms.Integration;
namespace WindowsFormsApplication15
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
ElementHost host = new ElementHost();
host.Dock = DockStyle.Fill;
this.Controls.Add(host);
}
}
}
When you resize the form , you can see two black edges at the form border: 调整窗体大小时 ,您可以在窗体边框处看到两个黑色边缘:
Please, ¿someone could give a working solution over my example to fix this issue? 请,¿有人可以为我的例子提供一个有效的解决方案来解决这个问题吗?
Try this (same idea as the first link you provided, but better performance): 试试这个(与你提供的第一个链接相同,但性能更好):
public class ElementHost2 : ElementHost {
public ElementHost2() {
this.AutoSize = true;
}
public override Size GetPreferredSize(Size proposedSize) {
Form f = this.FindForm();
Size s = f.ClientSize;
return s;
}
private const uint WM_SETREDRAW = 0xB;
[DllImport("user32.dll")]
private static extern int SendMessage(IntPtr hWnd, uint Msg, int wParam, int lParam);
[DllImport("user32.dll")]
static extern bool SetWindowPos(IntPtr hWnd, IntPtr hWndInsertAfter, int X, int Y, int cx, int cy, uint uFlags);
private const uint NOSIZE = 0x0001;
private const uint NOMOVE = 0x0002;
private const uint NOZORDER = 0x0004;
private const uint NOREDRAW = 0x0008;
private const uint NOACTIVATE = 0x0010;
private const uint DRAWFRAME = 0x0020;
private const uint FRAMECHANGED = 0x0020;
private const uint SHOWWINDOW = 0x0040;
private const uint HIDEWINDOW = 0x0080;
private const uint NOCOPYBITS = 0x0100;
private const uint NOOWNERZORDER = 0x0200;
private const uint NOREPOSITION = 0x0200;
private const uint NOSENDCHANGING = 0x0400;
private const uint DEFERERASE = 0x2000;
private const uint ASYNCWINDOWPOS = 0x4000;
protected override void OnResize(EventArgs e) {
base.OnResize(e);
SendMessage(this.Handle, WM_SETREDRAW, 0, 0);
SendMessage(this.Handle, WM_SETREDRAW, 1, 0);
// forces window to redraw:
SetWindowPos(this.Handle, IntPtr.Zero, 0, 0, 0, 0, NOSIZE | NOMOVE| NOZORDER | NOACTIVATE | SHOWWINDOW);
}
// better performance?
protected override void OnPaintBackground(PaintEventArgs pevent) {
//base.OnPaintBackground(pevent);
}
protected override void OnPaint(PaintEventArgs e) {
//base.OnPaint(e);
}
}
class Form2 : Form {
ElementHost host = new ElementHost2();
public Form2() {
Controls.Add(host);
this.BackColor = Color.Red;
var p = new System.Windows.Controls.DockPanel();
p.Background = System.Windows.Media.Brushes.Red;
host.Child = p;
p.Children.Add(new System.Windows.Controls.TextBox { Width = 100, Height = 20 });
}
}
The issue is not related to ElementHost and Winforms. 该问题与ElementHost和Winforms无关。 It's just a WPF issue, and I found the answer in the following SO question:
这只是一个WPF问题,我在以下SO问题中找到了答案:
How to fix the WPF form resize - controls lagging behind and black background? 如何修复WPF表单调整大小 - 控制滞后和黑色背景?
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