Windows窗体应用程序中的闪烁 [英] Flickering in a Windows Form application

问题描述

我在我的应用程序中包含以下代码，但再次发生闪烁.

i include the following code in my application but again the flickering is happening.

this.SetStyle(ControlStyles.AllPaintingInWmPaint, true);
                   this.SetStyle(ControlStyles.DoubleBuffer |
              ControlStyles.OptimizedDoubleBuffer |
              ControlStyles.UserPaint |
              ControlStyles.AllPaintingInWmPaint, true);
                   this.UpdateStyles();

此代码包含在

this code included inside

public Form1()
{}

为什么这件事发生了..?
我的应用程序包含1种形式，其中25种面板用于不同用途.当我使用键盘的向下箭头选择下拉列表项时，表格闪烁.首先，我不知道那东西在闪烁.现在我意识到这是闪烁的，并做了一些操作来消除闪烁.但这不起作用.

Why this thing is happening..?
My application contains 1 form with 25 panels for different uses. when i select drop-down list items using keyboards down arrow,the form is flickering. first i couldn''t realize that that thing is flickering. now i realize that is flickering and did something to remove flickering. but that''s not working.

推荐答案

Stackover流专家帮助我解决了这个问题...感谢Stack溢出....
另一个解决方案:

//TODO:不要忘记使用System.Runtime.InteropServices.

Stackover flow experts help me to solve this issue... Thanks to Stack overflow....
Yet another solution:

//TODO: Don''t forget to include using System.Runtime.InteropServices.

internal static class NativeWinAPI
{
    internal static readonly int GWL_EXSTYLE = -20;
    internal static readonly int WS_EX_COMPOSITED = 0x02000000;

    [DllImport("user32")]
    internal static extern int GetWindowLong(IntPtr hWnd, int nIndex);

    [DllImport("user32")]
    internal static extern int SetWindowLong(IntPtr hWnd, int nIndex, int dwNewLong);
}

您的表单构造函数应如下所示:

And your form constructor should look as follows:

public MyForm()
{
    InitializeComponent();

    int style = NativeWinAPI.GetWindowLong(this.Handle, NativeWinAPI.GWL_EXSTYLE);
    style |= NativeWinAPI.WS_EX_COMPOSITED;
    NativeWinAPI.SetWindowLong(this.Handle, NativeWinAPI.GWL_EXSTYLE, style);
}

在上面的代码中，您可以将this.Handle更改为MyFlickeringPanel.Handle

您可以在这里阅读更多有关它的信息:扩展窗口样式和CreateWindowEx.

设置WS_EX_COMPOSITED后，窗口的所有后代将使用双缓冲从下到上的绘画顺序.从下到上的绘画顺序允许后代窗口具有半透明(alpha)和透明(color-key)效果，但前提是后代窗口也设置了WS_EX_TRANSPARENT位.双重缓冲允许绘制窗口及其后代，而不会闪烁.

共享|编辑

23分钟前回答了
尼古拉·基尔
864

In the code above, you might change this.Handle to something like MyFlickeringPanel.Handle

You can read a bit more about it here: Extended Window Styles and here: CreateWindowEx.

With WS_EX_COMPOSITED set, all descendants of a window get bottom-to-top painting order using double-buffering. Bottom-to-top painting order allows a descendent window to have translucency (alpha) and transparency (color-key) effects, but only if the descendent window also has the WS_EX_TRANSPARENT bit set. Double-buffering allows the window and its descendents to be painted without flicker.

share|edit

answered 23 mins ago
Nikolay Khil
864

Stackover流专家帮助我解决了这个问题...感谢Stack溢出....
另一个解决方案:

//TODO:不要忘记使用System.Runtime.InteropServices.
收合|复制代码

内部静态类NativeWinAPI
{
内部静态只读int GWL_EXSTYLE = -20;
内部静态只读int WS_EX_COMPOSITED = 0x02000000;

[DllImport("user32")]
内部静态外部int GetWindowLong(IntPtr hWnd，int nIndex);

[DllImport("user32")]
内部静态外部int SetWindowLong(IntPtr hWnd，int nIndex，int dwNewLong);
}

您的表单构造函数应如下所示:
收合|复制代码

公共MyForm()
{
InitializeComponent();

int样式= NativeWinAPI.GetWindowLong(this.Handle，NativeWinAPI.GWL_EXSTYLE);
样式| = NativeWinAPI.WS_EX_COMPOSITED;
NativeWinAPI.SetWindowLong(this.Handle，NativeWinAPI.GWL_EXSTYLE，style);
}

在上面的代码中，您可以将this.Handle更改为MyFlickeringPanel.Handle

您可以在这里阅读更多有关它的信息:扩展窗口样式和CreateWindowEx.

设置WS_EX_COMPOSITED后，窗口的所有后代将使用双缓冲从下到上的绘画顺序.从下到上的绘画顺序允许后代窗口具有半透明(alpha)和透明(color-key)效果，但前提是后代窗口也设置了WS_EX_TRANSPARENT位.双重缓冲允许绘制窗口及其后代，而不会闪烁.

共享|编辑

23分钟前回答了
尼古拉·基尔
864

Stackover flow experts help me to solve this issue... Thanks to Stack overflow....
Yet another solution:

//TODO: Don''t forget to include using System.Runtime.InteropServices.
Collapse | Copy Code

internal static class NativeWinAPI
{
internal static readonly int GWL_EXSTYLE = -20;
internal static readonly int WS_EX_COMPOSITED = 0x02000000;

[DllImport("user32")]
internal static extern int GetWindowLong(IntPtr hWnd, int nIndex);

[DllImport("user32")]
internal static extern int SetWindowLong(IntPtr hWnd, int nIndex, int dwNewLong);
}

And your form constructor should look as follows:
Collapse | Copy Code

public MyForm()
{
InitializeComponent();

int style = NativeWinAPI.GetWindowLong(this.Handle, NativeWinAPI.GWL_EXSTYLE);
style |= NativeWinAPI.WS_EX_COMPOSITED;
NativeWinAPI.SetWindowLong(this.Handle, NativeWinAPI.GWL_EXSTYLE, style);
}

In the code above, you might change this.Handle to something like MyFlickeringPanel.Handle

You can read a bit more about it here: Extended Window Styles and here: CreateWindowEx.

With WS_EX_COMPOSITED set, all descendants of a window get bottom-to-top painting order using double-buffering. Bottom-to-top painting order allows a descendent window to have translucency (alpha) and transparency (color-key) effects, but only if the descendent window also has the WS_EX_TRANSPARENT bit set. Double-buffering allows the window and its descendents to be painted without flicker.

share|edit

answered 23 mins ago
Nikolay Khil
864

这篇关于Windows窗体应用程序中的闪烁的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！