如何在 WinForms 中平滑过渡面板? [英] How to smoothly transition a panel in WinForms?

问题描述

我正在尝试从表单的左边缘调出菜单.当我这样做时，我希望表单顶部的面板缩小.面板上有按钮，锚点设置为右".

I am trying to bring out a menu from the left edge of a form. As I do it I want a panel at the top of the form to shrink. The panel has buttons on it with anchors set to 'Right'.

面板通过将其向左移动并将宽度减小相同的量来调整大小 - 因此按钮应保持在屏幕上的相同位置.按钮确实留在正确的位置，但看起来很糟糕.即使我使用 .Bounds = new Rectangle(...) 设置面板的新尺寸，它看起来好像我设置了 Left 属性，然后设置了 Width 有时间延迟！我搞砸了 SuspendLayout 没有任何影响.我觉得有一个简单的方法可以解决这个问题.我创建的一个简单示例:

The panel resizes by moving it to the left and reducing the width by the same amount - so the buttons should stay in the same place on screen. The buttons do stay in the correct place but look awful doing it. Even though I set the panel's new dimensions with .Bounds = new Rectangle(...) it looks as if I set the Left property and then the Width with a time delay! I have messed with SuspendLayout with no impact. I feel sure there is a simple way around this. A trivial example I created:

private void StartTest_Click( object sender, EventArgs e )
{
    _AmountLeft = PanelToResize.Width / 2; // half of it
    _Step = _AmountLeft / 10;
    Ticker.Enabled = true;
}

private void Ticker_Tick( object sender, EventArgs e )
{
    int this_bit = Math.Min( _AmountLeft, _Step );
    // reduce
    PanelToResize.Bounds = new Rectangle( PanelToResize.Left + this_bit, PanelToResize.Top, PanelToResize.Width - this_bit, PanelToResize.Height );
    if (this_bit == _AmountLeft)
        Ticker.Enabled = false;
    _AmountLeft -= this_bit;
}

我已将此代码和设计器代码放在此处:https://gist.github.com/anonymous/acf0ec4d5c81dbc5a670

I have placed this code and the designer code here: https://gist.github.com/anonymous/acf0ec4d5c81dbc5a670

推荐答案

在您的表单中尝试以下代码以减少闪烁.

Try the below code in your form to reduce flickering.

protected override CreateParams CreateParams
{
    get
    {
        const int WS_EX_COMPOSITED = 0x02000000;
        var cp = base.CreateParams;
        cp.ExStyle |= WS_EX_COMPOSITED;
        return cp;
    }
}

它对整个窗口表面进行双缓冲，包括子控件

Its double-buffer the entire window surface, including the child controls

请参阅此处了解值，包括 WS_EX_COMPOSITED

See here for the values, including WS_EX_COMPOSITED

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