Adding gwinSetFocus() and gwinGetFocus()

docs/releases.txt

@@ -9,6 +9,8 @@ FEATURE:	Added GFXSINGLEMAKE=yes|no to the ugfx makefile to compile ugfx as a si
 FEATURE:	New board STM32F746G-Discovery
 FEATURE:	New gdisp driver STM32LTDC
 FEATURE:	Better support for Raw32 platforms
+FEATURE:	Implementing widget focusing. See gwinSetFocus() and gwinGetFocus()
+
 
 *** Release 2.3 ***
 FEATURE:	Added more events to the slider widget

src/gwin/gwin.h

@@ -547,6 +547,31 @@ extern "C" {
 		 */
 		GHandle gwinGetNextWindow(GHandle gh);
 
+		/**
+		 * @brief	Set the focus to a specific widget
+		 *
+		 * @details	The widget that is currently in focus is the widget that
+		 *			receives mouse and keyboard events.
+		 *			Passing NULL will remove the focus from any widget.
+		 *
+		 * @param[in] gh	The widget handle. Non-widget handles will be ignored.
+		 *
+		 * @api
+		 */
+		void gwinSetFocus(GHandle gh);
+
+		/**
+		 * @brief	Get the widget that is currently in focus
+		 *
+		 * @details	The widget that is currently in focus is the widget that
+		 *			receives mouse and keyboard events.
+		 *
+		 * @return	The handle of the widget that is currently in focus. May be NULL.
+		 *
+		 * @api
+		 */
+		GHandle gwinGetFocus(void);
+
 		/**
 		 * @brief	Set a window or widget to flash
 		 *

src/gwin/gwin_wm.c

@@ -162,7 +162,7 @@
 extern const GWindowManager	GNullWindowManager;
 GWindowManager *			_GWINwm;
 bool_t						_gwinFlashState;
-
+static GHandle				_widgetInFocus;
 static gfxSem				gwinsem;
 static gfxQueueASync		_GWINList;
 #if GWIN_NEED_FLASHING
@@ -184,6 +184,8 @@ static volatile uint8_t		RedrawPending;
 
 void _gwmInit(void)
 {
+	_widgetInFocus = 0;
+
 	gfxSemInit(&gwinsem, 1, 1);
 	gfxQueueASyncInit(&_GWINList);
 	#if GWIN_NEED_FLASHING
@@ -571,6 +573,25 @@ GHandle gwinGetNextWindow(GHandle gh) {
 	return gh ? (GHandle)gfxQueueASyncNext(&gh->wmq) : (GHandle)gfxQueueASyncPeek(&_GWINList);
 }
 
+void gwinSetFocus(GHandle gh) {
+	// Passing NULL removes the focus from any widget
+	if (gh == 0) {
+		_widgetInFocus = 0;
+		return;
+	}
+
+	// Only accept widgets
+	if (!gwinIsWidget(gh)) {
+		return;
+	}
+
+	_widgetInFocus = gh;
+}
+
+GHandle gwinGetFocus(void) {
+	return _widgetInFocus;
+}
+
 #if GWIN_NEED_FLASHING
 	static void FlashTimerFn(void *param) {
 		GHandle		gh;