ui fixes for macos

client/ui/macos_util.mm

@@ -0,0 +1,48 @@
+#include <QMainWindow>
+#include <Cocoa/Cocoa.h>
+#include "macos_util.h"
+
+//this Objective-c class is used to override the action of system close button and zoom button
+//https://stackoverflow.com/questions/27643659/setting-c-function-as-selector-for-nsbutton-produces-no-results
+@interface ButtonPasser : NSObject{
+}
+@property(readwrite) QMainWindow* window;
++ (void)closeButtonAction:(id)sender;
+- (void)zoomButtonAction:(id)sender;
+@end
+
+@implementation ButtonPasser{
+}
++ (void)closeButtonAction:(id)sender
+{
+    Q_UNUSED(sender);
+    ProcessSerialNumber pn;
+    GetFrontProcess (&pn);
+    ShowHideProcess(&pn,false);
+}
+- (void)zoomButtonAction:(id)sender
+{
+    Q_UNUSED(sender);
+    if (0 == self.window) return;
+    if (self.window->isMaximized()) self.window->showNormal();
+    else self.window->showMaximized();
+}
+@end
+
+void fixWidget(QWidget *widget)
+{
+    NSView *view = (NSView *)widget->winId();
+    if (0 == view) return;
+    NSWindow *window = view.window;
+    if (0 == window) return;
+
+    //override the action of close button
+    //https://stackoverflow.com/questions/27643659/setting-c-function-as-selector-for-nsbutton-produces-no-results
+    //https://developer.apple.com/library/content/documentation/General/Conceptual/CocoaEncyclopedia/Target-Action/Target-Action.html
+//    NSButton *closeButton = [window standardWindowButton:NSWindowCloseButton];
+//    [closeButton setTarget:[ButtonPasser class]];
+//    [closeButton setAction:@selector(closeButtonAction:)];
+
+    [[window standardWindowButton:NSWindowZoomButton] setHidden:YES];
+    [[window standardWindowButton:NSWindowMiniaturizeButton] setHidden:YES];
+}