Dynamically switch to the retina toolbar icons as appropriate

aegisub/src/Makefile

@@ -16,7 +16,7 @@ LIBS += $(LIBS_FONTCONFIG) $(LIBS_FFTW3) $(LIBS_UCHARDET) $(LIBS_BOOST)
 LIBS += $(LIBS_ICU) $(LIBS_LUA)
 
 ifeq (yes, $(BUILD_DARWIN))
-SRC += osx_utils.mm
+SRC += osx_utils.mm retina_helper.mm
 endif
 
 ###############

aegisub/src/osx_utils.mm

@@ -62,7 +62,3 @@ void SetPlaceholderText(wxWindow *window, wxString const& placeholder) {
     }
 }
 
-double GetScaleFactor(wxWindow *window) {
-    NSWindow *nsWindow = [window->GetHandle() window];
-    return [nsWindow respondsToSelector:@selector(backingScaleFactor)] ? nsWindow.backingScaleFactor : 1.0;
-}

aegisub/src/retina_helper.h

@@ -0,0 +1,32 @@
+// Copyright (c) 2013, Thomas Goyne <plorkyeran@aegisub.org>
+//
+// Permission to use, copy, modify, and distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice appear in all copies.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+//
+// Aegisub Project http://www.aegisub.org/
+
+#include <libaegisub/signal.h>
+
+class wxWindow;
+
+class RetinaHelper {
+	wxWindow *window;
+	void *observer;
+	agi::signal::Signal<int> ScaleFactorChanged;
+public:
+	RetinaHelper(wxWindow *window);
+	~RetinaHelper();
+
+	int GetScaleFactor() const;
+	DEFINE_SIGNAL_ADDERS(ScaleFactorChanged, AddScaleFactorListener)
+};
+

aegisub/src/retina_helper.mm

@@ -0,0 +1,64 @@
+// Copyright (c) 2013, Thomas Goyne <plorkyeran@aegisub.org>
+//
+// Permission to use, copy, modify, and distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice appear in all copies.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+//
+// Aegisub Project http://www.aegisub.org/
+
+#include "config.h"
+
+#include "retina_helper.h"
+
+#include <Cocoa/Cocoa.h>
+#include <wx/window.h>
+
+
+@interface RetinaObserver : NSObject
+@property (nonatomic, assign) NSWindow *window;
+@property (nonatomic, copy) void (^block)();
+@end
+
+@implementation RetinaObserver
+- (void)backingPropertiesDidChange:(NSNotification *)notification {
+	self.block();
+}
+
+- (void)dealloc {
+	[_block release];
+	[super dealloc];
+}
+@end
+
+RetinaHelper::RetinaHelper(wxWindow *window)
+: window(window)
+, observer([RetinaObserver new])
+{
+	RetinaObserver *obs = (id)observer;
+	obs.window = window->GetHandle().window;
+	obs.block = ^{ ScaleFactorChanged(GetScaleFactor()); };
+
+	NSNotificationCenter *nc = NSNotificationCenter.defaultCenter;
+	[nc addObserver:(id)observer
+	       selector:@selector(backingPropertiesDidChange:)
+	           name:NSWindowDidChangeBackingPropertiesNotification
+	         object:window->GetHandle().window];
+}
+
+RetinaHelper::~RetinaHelper() {
+	[NSNotificationCenter.defaultCenter removeObserver:(id)observer];
+	[(id)observer release];
+}
+
+int RetinaHelper::GetScaleFactor() const {
+	return static_cast<int>(window->GetHandle().window.backingScaleFactor);
+}
+

aegisub/src/toolbar.cpp

@@ -26,6 +26,7 @@
 #include "include/aegisub/hotkey.h"
 #include "libresrc/libresrc.h"
 #include "options.h"
+#include "retina_helper.h"
 #include "utils.h"
 
 #include <libaegisub/hotkey.h>
@@ -61,6 +62,9 @@ namespace {
 		std::vector<cmd::Command *> commands;
 		/// Hotkey context
 		std::string ht_context;
+
+		RetinaHelper retina_helper;
+
 		/// Current icon size
 		int icon_size;
 
@@ -170,6 +174,7 @@ namespace {
 		, name(std::move(name))
 		, context(c)
 		, ht_context(std::move(ht_context))
+		, retina_helper(parent)
 		, icon_size(OPT_GET("App/Toolbar Icon Size")->GetInt())
 		, icon_size_slot(OPT_SUB("App/Toolbar Icon Size", &Toolbar::OnIconSizeChange, this))
 		, hotkeys_changed_slot(hotkey::inst->AddHotkeyChangeListener(&Toolbar::RegenerateToolbar, this))
@@ -183,11 +188,16 @@ namespace {
 		, name(std::move(name))
 		, context(c)
 		, ht_context(std::move(ht_context))
+		, retina_helper(parent)
 #ifndef __WXMAC__
 		, icon_size(OPT_GET("App/Toolbar Icon Size")->GetInt())
 		, icon_size_slot(OPT_SUB("App/Toolbar Icon Size", &Toolbar::OnIconSizeChange, this))
 #else
-		, icon_size(32 * GetScaleFactor(parent))
+		, icon_size(32 * retina_helper.GetScaleFactor())
+		, icon_size_slot(retina_helper.AddScaleFactorListener([=](double scale) {
+			icon_size = 32 * retina_helper.GetScaleFactor();
+			RegenerateToolbar();
+		}))
 #endif
 		, hotkeys_changed_slot(hotkey::inst->AddHotkeyChangeListener(&Toolbar::RegenerateToolbar, this))
 		{

aegisub/src/utils.cpp

@@ -40,6 +40,7 @@
 #include "frame_main.h"
 #include "main.h"
 #include "options.h"
+#include "retina_helper.h"
 
 #include <libaegisub/ass/dialogue_parser.h>
 #include <libaegisub/dispatch.h>
@@ -267,11 +268,15 @@ size_t MaxLineLength(std::string const& text, bool ignore_whitespace) {
 }
 
 
-// OS X implementation in osx_utils.mm
 #ifndef __WXOSX_COCOA__
+// OS X implementation in osx_utils.mm
 void AddFullScreenButton(wxWindow *) { }
 void SetFloatOnParent(wxWindow *) { }
-double GetScaleFactor(wxWindow *) { return 1; }
+
+// OS X implementation in retina_helper.mm
+RetinaHelper::RetinaHelper(wxWindow *) { }
+RetinaHelper::~RetinaHelper() { }
+int RetinaHelper::GetScaleFactor() const { return 1; }
 #endif
 
 wxString FontFace(std::string opt_prefix) {

aegisub/src/utils.h

@@ -78,8 +78,6 @@ void SetFloatOnParent(wxWindow *window);
 
 void SetPlaceholderText(wxWindow *window, wxString const& placeholder);
 
-double GetScaleFactor(wxWindow *window);
-
 /// Forward a mouse wheel event to the window under the mouse if needed
 /// @param source The initial target of the wheel event
 /// @param evt The event