如何在Windows 8.1中获取WPF窗口的标题栏颜色？

Question

要使用WindowChrome类自定义窗口的外观,我想在Windows 8.1中获得WPF窗口的标题栏颜色.

首先,我试过了

SystemParameters.WindowGlassColor 

但是这个属性但不包括正确的alpha值(它总是255).

其次,我尝试了这个功能:

DwmGetColorizationColor 

它起初似乎工作正常.返回值具有正确的颜色信息,包括alpha通道.但是,在"颜色和外观"对话框中通过滑块更改"颜色强度"时,返回值将远离实际值并指示奇怪的颜色.

那么,有没有人对替代方法或解决方法有所了解？

Answer 1

我找到了解决方案.实际上,已经讨论过基本观点.

• 获取Windows 8自动颜色主题的活动颜色
• 更改Windows Aero Color

顺序将是:

1. 通过DwmGetColorizationParameters函数(未记录的API)获取参数.
2. 将colorizationColor参数转换为Color忽略alpha通道.
3. 准备基础灰色(R = 217,G = 217,B = 217).
4. 使用colorizationColorBalance参数混合两种颜色,该参数对应于"颜色强度".

所以,我的代码如下:

public static Color? GetChromeColor()
{
    bool isEnabled;
    var hr1 = DwmIsCompositionEnabled(out isEnabled);
    if ((hr1 != 0) || !isEnabled) // 0 means S_OK.
        return null;

    DWMCOLORIZATIONPARAMS parameters;
    try
    {
        // This API is undocumented and so may become unusable in future versions of OSes.
        var hr2 = DwmGetColorizationParameters(out parameters);
        if (hr2 != 0) // 0 means S_OK.
            return null;
    }
    catch
    {
        return null;
    }

    // Convert colorization color parameter to Color ignoring alpha channel.
    var targetColor = Color.FromRgb(
        (byte)(parameters.colorizationColor >> 16),
        (byte)(parameters.colorizationColor >> 8),
        (byte)parameters.colorizationColor);

    // Prepare base gray color.
    var baseColor = Color.FromRgb(217, 217, 217);

    // Blend the two colors using colorization color balance parameter.
    return BlendColor(targetColor, baseColor, (double)(100 - parameters.colorizationColorBalance));
}

private static Color BlendColor(Color color1, Color color2, double color2Perc)
{
    if ((color2Perc < 0) || (100 < color2Perc))
        throw new ArgumentOutOfRangeException("color2Perc");

    return Color.FromRgb(
        BlendColorChannel(color1.R, color2.R, color2Perc),
        BlendColorChannel(color1.G, color2.G, color2Perc),
        BlendColorChannel(color1.B, color2.B, color2Perc));
}

private static byte BlendColorChannel(double channel1, double channel2, double channel2Perc)
{
    var buff = channel1 + (channel2 - channel1) * channel2Perc / 100D;
    return Math.Min((byte)Math.Round(buff), (byte)255);
}

[DllImport("Dwmapi.dll")]
private static extern int DwmIsCompositionEnabled([MarshalAs(UnmanagedType.Bool)] out bool pfEnabled);

[DllImport("Dwmapi.dll", EntryPoint = "#127")] // Undocumented API
private static extern int DwmGetColorizationParameters(out DWMCOLORIZATIONPARAMS parameters);

[StructLayout(LayoutKind.Sequential)]
private struct DWMCOLORIZATIONPARAMS
{
    public uint colorizationColor;
    public uint colorizationAfterglow;
    public uint colorizationColorBalance; // Ranging from 0 to 100
    public uint colorizationAfterglowBalance;
    public uint colorizationBlurBalance;
    public uint colorizationGlassReflectionIntensity;
    public uint colorizationOpaqueBlend;
}