1 files changed, 118 insertions, 0 deletions
diff --git a/Examples/WhisperDesktop/CircleIndicator.cpp b/Examples/WhisperDesktop/CircleIndicator.cpp
new file mode 100644
index 0000000..593bd4a
--- /dev/null
+++ b/Examples/WhisperDesktop/CircleIndicator.cpp
@@ -0,0 +1,118 @@
+#include "stdafx.h"
+#include "CircleIndicator.h"
+#include <atltypes.h>
+#include "AppState.h"
+
+namespace
+{
+	static const LPCTSTR windowClassName = L"CircleIndicator";
+
+	// Font with these symbols, shipped with Windows since forever:
+	// https://learn.microsoft.com/en-us/typography/font-list/segoe-ui-symbol
+	static const LPCTSTR fontName = L"Segoe UI Symbol";
+
+	// Outlined circle
+	static const LPCTSTR circleOutline = L"⚪";
+	// Filled circle
+	static const LPCTSTR circleFilled = L"⚫";
+
+	// Font size for that symbol font, in points
+	constexpr int fontSizePoints = 14;
+
+	// Default active color for the indicator
+	constexpr uint32_t defaultActiveColor = 0x7FFF7F;
+}
+
+CircleIndicator::CircleIndicator() :
+	activeColor( defaultActiveColor )
+{ }
+
+ATL::CWndClassInfo& CircleIndicator::GetWndClassInfo()
+{
+	// Use custom class style with CS_PARENTDC, and COLOR_3DFACE for the background
+	static ATL::CWndClassInfo wc = 
+	{
+		{ sizeof( WNDCLASSEX ),
+		CS_HREDRAW | CS_VREDRAW | CS_PARENTDC,
+		StartWindowProc,
+		0, 0, NULL, NULL, NULL, (HBRUSH)( COLOR_3DFACE + 1 ), NULL, windowClassName, NULL },
+		NULL, NULL, IDC_ARROW, TRUE, 0, _T( "" )
+	};
+	return wc;
+}
+
+// Class registration
+HRESULT CircleIndicator::registerClass()
+{
+	WNDPROC pUnusedWndSuperProc = nullptr;
+	ATOM a = GetWndClassInfo().Register( &pUnusedWndSuperProc );
+	if( 0 != a )
+		return S_OK;
+	return getLastHr();
+}
+
+HRESULT CircleIndicator::createFont( int height )
+{
+	LOGFONT logFont;
+	memset( &logFont, 0, sizeof( logFont ) );
+	logFont.lfHeight = height;
+	logFont.lfCharSet = ANSI_CHARSET;
+	logFont.lfOutPrecision = OUT_TT_PRECIS;
+	logFont.lfClipPrecision = CLIP_DEFAULT_PRECIS;
+	wcsncpy_s( logFont.lfFaceName, fontName, _TRUNCATE );
+	font.CreateFontIndirect( &logFont );
+	if( font )
+		return S_OK;
+	return E_FAIL;
+}
+
+void CircleIndicator::onDestroy()
+{
+	if( font )
+		font.DeleteObject();
+}
+
+void CircleIndicator::onPaint( CDCHandle dc )
+{
+	CRect rectInt32;
+	GetClientRect( &rectInt32 );
+
+	CPaintDC pdc( m_hWnd );
+
+	const int logPixels = pdc.GetDeviceCaps( LOGPIXELSY );
+	int fontSize = -MulDiv( fontSizePoints, logPixels, 72 );
+	if( !font || fontHeight != fontSize )
+	{
+		if( font )
+			font.DeleteObject();
+		HRESULT hr = createFont( fontSize );
+		if( FAILED( hr ) )
+			return;
+		fontHeight = fontSize;
+	}
+
+	pdc.SetBkColor( GetSysColor( COLOR_3DFACE ) );
+	pdc.SelectFont( font );
+	pdc.SetBkMode( OPAQUE );
+	constexpr UINT textFormat = DT_CENTER | DT_VCENTER;
+
+	if( isActive )
+	{
+		pdc.SetTextColor( activeColor );
+		pdc.DrawText( circleFilled, 1, rectInt32, textFormat );
+		pdc.SetBkMode( TRANSPARENT );
+	}
+
+	pdc.SetTextColor( 0 );
+	pdc.DrawText( circleOutline, 1, rectInt32, textFormat );
+}
+
+void CircleIndicator::setActive( bool nowActive )
+{
+	if( nowActive == isActive )
+		return;
+
+	// Repaint the control
+	isActive = nowActive;
+	InvalidateRect( nullptr );
+}
+\ No newline at end of file