c# - 没有 Aero Glass 的 DwmExtendFrameIntoClientArea

Question

在启用 Aero Glass 的情况下使用 DwmExtendFrameIntoClientArea API 调用效果很好。但是，我希望它在禁用 Aero Glass 时也能正常工作，就像它在 Windows 控制面板中的工作方式一样:

注意框架如何延伸到客户区，即使 Aero Glass 被禁用？当我在我的应用程序中调用 DwmExtendFrameIntoClientArea API 时，返回的 HRESULT 绝对不成功，我的应用程序最终看起来像这样:

http://img197.imageshack.us/img197/9629/clientapplication.png

通常情况下，启用 Aero Glass 后，边框会向下延伸到导航按钮下方，就像在控制面板中一样。我该怎么做呢？ DwmExtendFrameIntoClientArea 显然不起作用。

顺便说一下，如果相关的话，我的应用程序是一个 WPF 应用程序。

Answer 1

Nir 的回答是正确的；当合成被禁用时，你必须自己绘制那个区域。

我可以向您展示我在表单顶部面板的绘制处理程序中的代码 - 该面板通常负责绘制 0x00000000 透明黑色以使玻璃出现:

伪代码:

procedure DrawGlassHeaderArea(g: Graphics; r: Rectangle; IsFormFocused: Boolean);
const
   clFakeGlassColor = $00EAD1B9;  //(185, 209, 234) This is the fake foreground glass color (for use when composition is disabled)
   clFakeGlassColorUnfocused = $00F2E4D7; //(215, 228, 242) This is the fake background glass color (for use when composition is disabled)
begin
   if Dwm.IsCompositionEnabled then
   begin
      g.FillRectangle(r, 0x00000000); //fill rectangle with transparent black
   end
   else
      //Composition disabled; fake it like Microsoft does

      //The color to use depends if the form has focused or not
      Color glassColor;
      if (IsFormFocused) then
         c = clFakeGlassColor 
      else
         c = clFakeGlassColorUnfocused;

      g.FillRectangle(r, glassColor); //fill rectangle with fake color


      //Now we have to draw the two accent lines along the bottom
      Color edgeHighlight = ColorBlend(Colors.White, glassColor, 0.33); //mix 33% of glass color to white
      Color edgeShadow = ColorBlend(Colors.Black, glassColor, 0.33); //mix 33% of glass color to black

      //Draw highlight as 2nd-last row:
      g.DrawLine(edgeHighlight, Point(r.Left, r.Bottom-2), Point(r.Right, r.Bottom-2);

      //Draw shadow on the very last row:
      g.DrawLine(edgeHighlight, Point(r.Left, r.Bottom-1), Point(r.Right, r.Bottom-1);
   end;
end;

示例用法

procedure MyForm.PaintBox1Paint(PaintEventArgs e)
begin
   DrawGlassHeaderArea(e.Graphics, PaintBox1.ClientRectangle, this.HasFocus); 
end;

奖金截图

2014 年 7 月 9 日更新

@JakePetroules 是对的，我错了。用于假玻璃的“蓝色”未硬编码到 Windows 中。它可以使用 GetThemeColor 访问.

我编写了可用于 Window 类的所有可用颜色 (TMT_COLOR):

Note: For more information about Classes, Parts, and States, see Aero Style Classes, Parts, and States

使用时:

• 类:窗口
• 部分:WP_CAPTION
• State:n/a(StateID 未用于Caption 部分，也未用于整个Window 类)

并获取颜色代码propertyID:

• TMT_FILLCOLORHINT:当窗口有焦点时
• TMT_BORDERCOLORHINT:当窗口没有焦点时

你得到了两种重要的颜色:

我现在用来获取假玻璃颜色的伪代码:

public Color GetFakeClassColor(Boolean isWindowFocused=true)
{
   static Color fakeGlass= 0x00B8D0E9; //the correct answer anyway

   if ((GetThemeAppProperties() && STAP_ALLOW_CONTROLS) == 0)
      return fakeGlass;

   hTheme = OpenThemeData(GetDesktopWindow(), "Window");
   if (hTheme = 0)
      return fakeGlass;

   Int32 propID;
   if (isWindowFocused)
       propID= TMT_FILLCOLORHINT; //The color used as a fill color hint for custom controls.
   else
       propID= TMT_BORDERCOLORHINT; //The color used as a border color hint for custom controls.

   DWORD rgb;
   if (Failed(GetThemeColor(hTheme, WP_CAPTION, 0, propID, ref rgb))
      return fakeGlass;

   Result = new Color(rgb);
}

实际上，因为我使用 Delphi，所以我的实际代码是:

function GetFakeGlassColor(IsWindowFocused: Boolean=True): TColor;
var
    ted: TThemedElement;
    hTheme: THandle;
    propID: Integer;
    rgb: DWORD;
begin
    Result := $00B8D0E9; //the correct answer anyway

    //We can't use the ThemeServcies.ThemesEnabled, as that mistakenly checks for version 6 of the common controls library
    //Themes can be enabled without using ComCtl V6, or common controls at all
    if not ThemeServices.ThemesAvailable then
        Exit;
    if (GetThemeAppProperties and STAP_ALLOW_CONTROLS) = 0 then
        Exit;

    htheme := ThemeServices.Theme[teWindow];
    if hTheme = 0 then
        Exit;

    if IsWindowFocused then
        propID := TMT_FILLCOLORHINT //The color used as a fill color hint for custom controls.
    else
        propID := TMT_BORDERCOLORHINT; //The color used as a border color hint for custom controls.

    if Failed(GetThemeColor(hTheme, WP_CAPTION, 0, propID, {var}rgb)) then
        Exit;

    Result := rgb;
end;