handle click dock icon to reopen app for Mac

ui/app_delegate_darwin.go

@@ -0,0 +1,27 @@
+//go:build darwin
+
+package ui
+
+/*
+void installReopenDelegate();
+*/
+import "C"
+
+import "fyne.io/fyne/v2"
+
+var darwinAppDelegateReopenWindow fyne.Window
+
+func installReopenHandler(w fyne.Window) {
+	darwinAppDelegateReopenWindow = w
+	C.installReopenDelegate()
+}
+
+//export appReopened
+func appReopened() {
+	if darwinAppDelegateReopenWindow == nil {
+		return
+	}
+	go func() {
+		fyne.Do(darwinAppDelegateReopenWindow.Show)
+	}()
+}

ui/app_delegate_darwin.m

@@ -0,0 +1,41 @@
+//go:build darwin
+
+#import <AppKit/AppKit.h>
+
+extern void appReopened(void);
+
+@interface ReopenDelegate : NSObject<NSApplicationDelegate>
+@property (nonatomic, strong) id<NSApplicationDelegate> wrapped;
+@end
+
+
+@implementation ReopenDelegate
+
+- (BOOL)applicationShouldHandleReopen:(NSApplication *)app
+                    hasVisibleWindows:(BOOL)hasVisible {
+    if (!hasVisible) {
+        appReopened();
+    }
+    if ([self.wrapped respondsToSelector:_cmd]) {
+        return [self.wrapped applicationShouldHandleReopen:app
+                                        hasVisibleWindows:hasVisible];
+    }
+    return YES;
+}
+
+- (BOOL)respondsToSelector:(SEL)sel {
+    return [super respondsToSelector:sel] ||
+           [self.wrapped respondsToSelector:sel];
+}
+
+- (id)forwardingTargetForSelector:(SEL)sel {
+    return [self.wrapped respondsToSelector:sel] ? self.wrapped : nil;
+}
+
+@end
+
+void installReopenDelegate(void) {
+    ReopenDelegate *d = [ReopenDelegate new];
+    d.wrapped = [NSApp delegate];
+    [NSApp setDelegate:d];
+}

ui/app_delegate_other.go

@@ -0,0 +1,8 @@
+//go:build !darwin
+
+package ui
+
+import "fyne.io/fyne/v2"
+
+func installReopenHandler(w fyne.Window) {
+}

ui/mainwindow.go

@@ -61,6 +61,7 @@ func NewMainWindow(fyneApp fyne.App, appName, displayAppName, appVersion string,
 		Window: fyneApp.NewWindow(displayAppName),
 		theme:  myTheme.NewMyTheme(&app.Config.Theme, app.ThemesDir()),
 	}
+	installReopenHandler(m.Window)
 	fynetooltip.SetToolTipTextSizeName(myTheme.SizeNameSubText)
 
 	m.theme.NormalFont = app.Config.Application.FontNormalTTF
@@ -184,7 +185,7 @@ func NewMainWindow(fyneApp fyne.App, appName, displayAppName, appVersion string,
 
 	m.Window.SetCloseIntercept(func() {
 		m.SaveWindowSettings()
-		if app.Config.Application.CloseToSystemTray && m.HaveSystemTray() {
+		if runtime.GOOS == "darwin" || (app.Config.Application.CloseToSystemTray && m.HaveSystemTray()) {
 			m.Window.Hide()
 		} else {
 			m.Window.Close()