RAD Studio Get color of active window title bar in Delphi

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Get color of active window title bar in Delphi
[SHOWTOGROUPS=4,20]
This post shows you how to get the color of the title bar for the active window. The method to get the color of the title bar of an active window in Delphi has changed over time.

In Windows 7 could get the color by using clActiveCaption but on WIndows 10 that no longer works but you can use the following code instead.

The title bar can have two colours fading from left to right.

I have provided function to get the left and right color and to determine if the right color is used or not

Код:
unit zzColorU;

interface

uses Vcl.Graphics;

function zzGetWindowTitleBarPrimaryColor : TColor;
  // return the primary color of the title bar in active windows

function zzGetWindowTitleBarSecondaryColor : TColor;
  // return the secondary (right hand side) gradiated color of the title bar in active windows

function zzGetWindowTitleBarIsGradiated : boolean;
  // return TRUE if the color of title bars for active windows is gradiated

implementation

uses WinApi.Windows;

// =================================

function zzGetWindowTitleBarPrimaryColor : TColor;
  // return the primary color of the title bar in active windows
begin
          // https://docs.microsoft.com/en-us/windows/win32/api/winuser/nf-winuser-getsyscolor
  result := WinApi.Windows.GetSysColor (WinApi.Windows.COLOR_ACTIVECAPTION)
end;

// =================================

function zzGetWindowTitleBarSecondaryColor : TColor;
  // return the secondary (right hand side) gradiated color of the title bar in active windows
begin
          // https://docs.microsoft.com/en-us/windows/win32/api/winuser/nf-winuser-getsyscolor
  result := WinApi.Windows.GetSysColor (WinApi.Windows.COLOR_GRADIENTACTIVECAPTION);
end

// =================================

function zzGetWindowTitleBarIsGradiated : boolean;
  // return TRUE if the color of title bars for active windows is gradiated
var
  vUseGradient : boolean;
begin
  result := FALSE;
  if (SystemParametersInfo(SPI_GETGRADIENTCAPTIONS, 0, @vUseGradient, 0)) then
      if (vUseGradient) then
          result := TRUE;
end;

// =================================

end.
[/SHOWTOGROUPS]
 
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