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 ED241CED241CED241CED241CED241CED241CED241CED241CED241CED241CED24 1CED241CED241CED241CED241CED241CED241CED241CED241CEDFFFFFFFFFFFF FFFFFFFFFFFFFFFFFFFFFFFFFFFFFF241CED241CED241CED241CED241CED241C ED241CED241CED241CED241CED241CED241CED241CED241CED241CED241CED24 1CED241CED241CED241CED241CED241CED241CED241CED241CEDFFFFFFFFFFFF FFFFFFFFFFFFFFFFFFFFFFFFFFFFFF241CED241CED241CED241CED241CED241C ED241CED241CED241CED241CED241CED241CED241CED241CED241CED241CED24 1CED241CED241CED241CED241CED241CED241CED241CED241CEDFFFFFFFFFFFF FFFFFFFFFFFFFFFFFFFFFFFFFFFFFF241CED241CED241CED241CED241CED241C ED241CED241CED241CED241CED241CED241CED241CED241CED241CED241CED24 1CED241CED241CED241CED241CED241CED241CED241CED241CEDFFFFFFFFFFFF FFFFFFFFFFFFFFFFFFFFFFFFFFFFFF241CED241CED241CED241CED241CEDFFFF FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF FFFFFFFFFFFFFFFFFFFFFF241CED241CED241CED241CED241CEDFFFFFFFFFFFF FFFFFFFFFFFFFFFFFFFFFFFFFFFFFF241CED241CED241CED241CED241CEDFFFF FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF FFFFFFFFFFFFFFFFFFFFFF241CED241CED241CED241CED241CEDFFFFFFFFFFFF FFFFFFFFFFFFFFFFFFFFFFFFFFFFFF241CED241CED241CED241CED241CEDFFFF FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF FFFFFFFFFFFFFFFFFFFFFF241CED241CED241CED241CED241CEDFFFFFFFFFFFF FFFFFFFFFFFFFFFFFFFFFFFFFFFFFF241CED241CED241CED241CED241CEDFFFF FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF FFFFFFFFFFFFFFFFFFFFFF241CED241CED241CED241CED241CEDFFFFFFFFFFFF FFFFFFFFFFFFFFFFFFFFFFFFFFFFFF241CED241CED241CED241CED241CEDFFFF FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF FFFFFFFFFFFFFFFFFFFFFF241CED241CED241CED241CED241CEDFFFFFFFFFFFF FFFFFFFFFFFFFFFFFFFFFFFFFFFFFF241CED241CED241CED241CED241CEDFFFF FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF FFFFFFFFFFFFFFFFFFFFFF241CED241CED241CED241CED241CEDFFFFFFFFFFFF FFFFFFFFFFFFFFFFFFFFFFFFFFFFFF241CED241CED241CED241CED241CEDFFFF FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF FFFFFFFFFFFFFFFFFFFFFF241CED241CED241CED241CED241CEDFFFFFFFFFFFF FFFFFFFFFFFFFFFFFFFFFFFFFFFFFF241CED241CED241CED241CED241CEDFFFF FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF FFFFFFFFFFFFFFFFFFFFFF241CED241CED241CED241CED241CEDFFFFFFFFFFFF FFFFFFFFFFFFFFFFFFFFFFFFFFFFFF241CED241CED241CED241CED241CEDFFFF FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF FFFFFFFFFFFFFFFFFFFFFF241CED241CED241CED241CED241CEDFFFFFFFFFFFF FFFFFFFFFFFFFFFFFFFFFFFFFFFFFF241CED241CED241CED241CED241CEDFFFF FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF FFFFFFFFFFFFFFFFFFFFFF241CED241CED241CED241CED241CEDFFFFFFFFFFFF FFFFFFFFFFFFFFFFFFFFFFFFFFFFFF241CED241CED241CED241CED241CEDFFFF FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF FFFFFFFFFFFFFFFFFFFFFF241CED241CED241CED241CED241CEDCC483FCC483F CC483FCC483FCC483FCC483FCC483F241CED241CED241CED241CED241CEDCC48 3FCC483FCC483FCC483FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF FFFFFFFFFFFFFFFFFFFFFF241CED241CED241CED241CED241CEDCC483FCC483F CC483FCC483FCC483FCC483FCC483F241CED241CED241CED241CED241CEDCC48 3FCC483FCC483FCC483FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF FFFFFFFFFFFFFFFFFFFFFF241CED241CED241CED241CED241CEDCC483FCC483F CC483FCC483FCC483FCC483FCC483F241CED241CED241CED241CED241CEDCC48 3FCC483FCC483FCC483FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF FFFFFFFFFFFFFFFFFFFFFF241CED241CED241CED241CED241CEDCC483FCC483F CC483FCC483FCC483FCC483FCC483F241CED241CED241CED241CED241CEDCC48 3FCC483FCC483FCC483FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF FFFFFFFFFFFFFFFFFFFFFF241CED241CED241CED241CED241CEDCC483FCC483F CC483FCC483FCC483FCC483FCC483F241CED241CED241CED241CED241CED241C ED241CED241CED241CED241CED241CED241CED241CED241CED241CED241CED24 1CED241CED241CED241CED241CED241CED241CED241CED241CEDCC483FCC483F CC483FCC483FFFFFFFFFFFFFFFFFFF241CED241CED241CED241CED241CED241C ED241CED241CED241CED241CED241CED241CED241CED241CED241CED241CED24 1CED241CED241CED241CED241CED241CED241CED241CED241CEDCC483FCC483F CC483FCC483FFFFFFFFFFFFFFFFFFF241CED241CED241CED241CED241CED241C ED241CED241CED241CED241CED241CED241CED241CED241CED241CED241CED24 1CED241CED241CED241CED241CED241CED241CED241CED241CEDCC483FCC483F CC483FCC483FFFFFFFFFFFFFFFFFFF241CED241CED241CED241CED241CED241C ED241CED241CED241CED241CED241CED241CED241CED241CED241CED241CED24 1CED241CED241CED241CED241CED241CED241CED241CED241CEDCC483FCC483F CC483FCC483FFFFFFFFFFFFFFFFFFF241CED241CED241CED241CED241CED241C ED241CED241CED241CED241CED241CED241CED241CED241CED241CED241CED24 1CED241CED241CED241CED241CED241CED241CED241CED241CEDCC483FCC483F CC483FCC483FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFCC483FCC48 3FCC483FCC483FCC483FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFCC483FCC483F CC483FCC483FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFCC483FCC48 3FCC483FCC483FCC483FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFCC483FCC483F CC483FCC483FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFCC483FCC48 3FCC483FCC483FCC483FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFCC483FCC483F CC483FCC483FCC483FCC483FCC483FCC483FCC483FCC483FCC483FCC483FCC48 3FCC483FCC483FCC483FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFCC483FCC483F CC483FCC483FCC483FCC483FCC483FCC483FCC483FCC483FCC483FCC483FCC48 3FCC483FCC483FCC483FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFCC483FCC483F CC483FCC483FCC483FCC483FCC483FCC483FCC483FCC483FCC483FCC483FCC48 3FCC483FCC483FCC483FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFCC483FCC483F CC483FCC483FCC483FCC483FCC483FCC483FCC483FCC483FCC483FCC483FCC48 3FCC483FCC483FCC483FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF} end end end
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.
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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