DwmExtendFrameIntoClientArea 没有 TransparencyKey？
使用 DwmExtendFrameIntoClientArea 函数时，我需要选择 Form.TransparencyKey，这是绘制玻璃的颜色。
问题是我编写图像编辑工具，当 TransparencyKey 颜色出现在编辑的图像内时，用户看到的是玻璃。
如何将玻璃延伸到客户区域而不损失一些颜色？
When using DwmExtendFrameIntoClientArea function I need to choose Form.TransparencyKey, a color that a glass will be drawn on instead.
The problem is that i writing image-edit tool, and when TransparencyKey color appear inside the edited image, the user see glass instead.
How do i extend the glass into client area without losing some color?
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您没有理由将
Form.TransparencyKey属性与 DWM 函数一起使用。该属性与分层窗口有关，与 Aero 玻璃效果无关。我认为它可能起作用的事实更多是实现细节的结果（例如您设置为 TransparencyKey 的颜色的所有 3 个 RGB 值都是相同的），而不是设计使然。GDI 将黑色视为透明颜色，因此您应该只使用黑色画笔绘制要显示为玻璃的窗体的特定区域。因为您将黑色填充仅限于这些区域，所以这不会干扰 UI 的其余部分。
当然，出现在您渲染为玻璃的区域中的任何黑色文本（例如在控件上绘制的文本）都会看起来很难看。解决方案是切换到基于 GDI+ 的渲染，或者将控件移到要渲染为玻璃的区域之外。如果您需要比
DwmExtendFrameIntoClientArea提供的表单区域（实际上只是将框架扩展一定量）更好地控制显示为玻璃状的区域，请考虑使用DwmEnableBlurBehindWindow代替。请参阅我的更完整的在这里回答如何使用该功能。There's no reason you should be using the
Form.TransparencyKeyproperty with DWM functions. That property relates to layered windows, which has nothing to do with the Aero glass effect. I assume the fact that it might work is more a consequence of implementation detail (like all 3 RGB values of the color you've set as theTransparencyKeyare the same), rather than by design.GDI treats black as the transparency color, so you should just paint the particular regions of your form that you want to appear as glass with a black brush. Because you're limiting the black fill to only those areas, there's no reason this should interfere with the rest of your UI.
Of course, any black text (such as that drawn on controls) that appears in the area you're rendering as glass is going to look ugly. The solution is either to switch to GDI+-based rendering or to move your controls outside of the area to be rendered as glass. If you need finer control over the area of your form that should appear glassy than provided by
DwmExtendFrameIntoClientArea(which literally just extends the frame by a set amount), look into usingDwmEnableBlurBehindWindowinstead. See my more complete answer here on how to use that function.