delphi – 从TSpeedButton中删除闪烁

概述重现步骤： >将TPanel添加到新的VCL表单并设置Align = alClient. >将TSpeedButton添加到面板并将一些bmp图像分配给Glyph属性. (可选但更清晰：Flat = True) >运行应用程序,抓住表单的右下角并移动它. TSpeedButton中的图像将闪烁. 我阅读了很多关于消除闪烁的内容,但这些建议似乎都不适用于TSpeedButton： >没有Double 重现步骤：

>将TPanel添加到新的VCL表单并设置Align = alClIEnt.
>将TSpeedbutton添加到面板并将一些bmp图像分配给Glyph属性. (可选但更清晰：Flat = True)
>运行应用程序,抓住表单的右下角并移动它. TSpeedbutton中的图像将闪烁.

我阅读了很多关于消除闪烁的内容,但这些建议似乎都不适用于TSpeedbutton：

>没有DoubleBuffered属性
>无法设置WS_EX_COMPOSITED,因为它不是TWinControl而是TGraphicControl
>未收到WM_ERASEBKGND消息

如果它有任何重要性,我实际上使用TPngSpeedbutton,但由于实际问题在于TSpeedbutton,我在示例中使用它.

这有什么解决方案吗？

编辑：由于某种原因,到目前为止没有人能够重现这一点,所以为了确保它不是我的描述,这里是dfm：

object Form1: TForm1  left = 0  top = 0  Caption = 'Form1'  ClIEntHeight = 337  ClIEntWIDth = 635  color = clBtnFace  Font.Charset = DEFAulT_CHARSET  Font.color = clWindowText  Font.Height = -11  Font.name = 'Tahoma'  Font.Style = []  oldCreateOrder = False  PixelsPerInch = 96  TextHeight = 13  object Panel1: TPanel    left = 0    top = 0    WIDth = 635    Height = 337    Align = alClIEnt    Caption = 'Panel1'    Taborder = 0    object Speedbutton1: TSpeedbutton      left = 64      top = 56      WIDth = 32      Height = 32      Flat = True      Glyph.Data = {        360C0000424D360C000000000000360000002800000020000000200000000100        180000000000000C000000000000000000000000000000000000FFFFFFFFFFFF        FFFFFFFFFFFFFFFFFFFFFFFFFFFFFF241CED241CED241CED241CED241CED241C        ED241CED241CED241CED241CED241CED241CED241CED241CED241CED241CED24        1CED241CED241CED241CED241CED241CED241CED241CED241CEDFFFFFFFFFFFF        FFFFFFFFFFFFFFFFFFFFFFFFFFFFFF241CED241CED241CED241CED241CED241C    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       FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF        FFFFFFFFFFFFFFFFFFFFFF241CED241CED241CED241CED241CEDFFFFFFFFFFFF        FFFFFFFFFFFFFFFFFFFFFFFFFFFFFF241CED241CED241CED241CED241CEDFFFF        FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF        FFFFFFFFFFFFFFFFFFFFFF241CED241CED241CED241CED241CEDFFFFFFFFFFFF        FFFFFFFFFFFFFFFFFFFFFFFFFFFFFF241CED241CED241CED241CED241CEDFFFF        FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF        FFFFFFFFFFFFFFFFFFFFFF241CED241CED241CED241CED241CEDFFFFFFFFFFFF        FFFFFFFFFFFFFFFFFFFFFFFFFFFFFF241CED241CED241CED241CED241CEDFFFF        FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF        FFFFFFFFFFFFFFFFFFFFFF241CED241CED241CED241CED241CEDFFFFFFFFFFFF        FFFFFFFFFFFFFFFFFFFFFFFFFFFFFF241CED241CED241CED241CED241CEDFFFF        FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF        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And this is how it looks.实际上它的速度要快一些,但捕获的视频和gif转换速度会慢下来.

解决方法 我实际上能够在windows 7上使用Delphi 10.2.3 Tokyo重现它.
我经常遇到类似的问题,从那以后我一直在为所有TPanel及其后代使用这个设置,这也适用于这种情况.

Panel1.DoubleBuffered := True;Panel1.ParentBackground := False;

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