如何修复 WPF 表单调整大小 - 控件滞后和黑色背景? [英] How to fix the WPF form resize - controls lagging behind and black background?

问题描述

我有一个非常简单的 WPF 窗口——其中唯一的东西是一个右对齐的按钮.当我通过拖动左边界来调整窗口大小时，按钮会跳来跳去 - 很多.自己试试，来回拖动左边界.

I have a very simple WPF window - the only thing in it is a right-aligned button. When I resize the window by dragging the left boundary, the button jumps around - a lot. Try it yourself, drag the left boundary back and forth.

此外，在调整大小期间，黑色背景会暂时暴露.

Additionally, a black background becomes exposed temporarily during resizes.

在这个问题中，我问了一个关于 Windows 窗体的类似问题.我得到的唯一答案是 WPF 中已修复此问题，但令人惊讶的是，它不仅没有修复，而且 WPF 还添加了第二个视觉错误 - 临时黑色背景.

In this question, I asked a similar question about Windows Forms. The only answer I got suggested that this is fixed in WPF, however, amazingly, not only is it not fixed, but WPF also adds a second visual bug - the temporary black background.

这是控制延迟的样子；当我通过顶部边框调整窗口大小时会发生这种情况(使用相机记录，因为屏幕帽通过使一切变慢而使其不那么明显):

Here's what the control lag looks like; this occurs when I resize the window by its top border (recorded with a camera because screen-cap made it less obvious by making everything slow):

                         

                                                 

黑色边框示例:这是在调整窗口大小时捕获的；这只是一瞬间，但非常明显:

Example of the black border: this was captured while resizing the window; it's only like this for a split second but it's very noticeable:

                   

                                     

我做错了吗?如何在调整大小期间让我的控件在视觉上保持在一个地方?如何避免黑边?

Am I doing something wrong? How can I have my controls stay visually in one place during resizes? How can I avoid the black border?

注意:按钮最终会在正确的位置结束 - 它只会在调整大小期间短暂跳动.

Note: the button ends up in the correct place eventually - it only jumps around briefly during the resize.

推荐答案

这是基于 Wieser Software Ltd 的第二个解决方案的完整工作代码.

This is complete working code based on Wieser Software Ltd's 2nd solution.

public partial class MainView : Window
{
    public MainView()
    {
        InitializeComponent();

        //ensure win32 handle is created
        var handle = new WindowInteropHelper(this).EnsureHandle();

        //set window background
        var result = SetClassLong(handle, GCL_HBRBACKGROUND, GetSysColorBrush(COLOR_WINDOW));
    }

    public static IntPtr SetClassLong(IntPtr hWnd, int nIndex, IntPtr dwNewLong)
    {
        //check for x64
        if (IntPtr.Size > 4)
            return SetClassLongPtr64(hWnd, nIndex, dwNewLong);
        else
            return new IntPtr(SetClassLongPtr32(hWnd, nIndex, unchecked((uint)dwNewLong.ToInt32())));
    }

    private const int GCL_HBRBACKGROUND = -10;
    private const int COLOR_WINDOW = 5;

    [DllImport("user32.dll", EntryPoint = "SetClassLong")]
    public static extern uint SetClassLongPtr32(IntPtr hWnd, int nIndex, uint dwNewLong);

    [DllImport("user32.dll", EntryPoint = "SetClassLongPtr")]
    public static extern IntPtr SetClassLongPtr64(IntPtr hWnd, int nIndex, IntPtr dwNewLong);

    [DllImport("user32.dll")]
    static extern IntPtr GetSysColorBrush(int nIndex);
}

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