Add options for which displays to show screen saver

ConfigureSheet.xib

@@ -0,0 +1,83 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<document type="com.apple.InterfaceBuilder3.Cocoa.XIB" version="3.0" toolsVersion="13771" targetRuntime="MacOSX.Cocoa" propertyAccessControl="none" useAutolayout="YES" customObjectInstantitationMethod="direct">
+    <dependencies>
+        <deployment identifier="macosx"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.CocoaPlugin" version="13771"/>
+        <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
+    </dependencies>
+    <objects>
+        <customObject id="-2" userLabel="File's Owner" customClass="EpochFlipClock">
+            <connections>
+                <outlet property="configSheet" destination="QvC-M9-y7g" id="Neh-j4-32j"/>
+                <outlet property="screenDisplayOption" destination="osi-OU-YaU" id="iw1-KE-NYE"/>
+            </connections>
+        </customObject>
+        <customObject id="-1" userLabel="First Responder" customClass="FirstResponder"/>
+        <customObject id="-3" userLabel="Application" customClass="NSObject"/>
+        <window allowsToolTipsWhenApplicationIsInactive="NO" autorecalculatesKeyViewLoop="NO" releasedWhenClosed="NO" visibleAtLaunch="NO" animationBehavior="default" id="QvC-M9-y7g" userLabel="Panel" customClass="NSPanel">
+            <windowStyleMask key="styleMask" titled="YES" closable="YES"/>
+            <windowPositionMask key="initialPositionMask" leftStrut="YES" rightStrut="YES" topStrut="YES" bottomStrut="YES"/>
+            <rect key="contentRect" x="196" y="240" width="320" height="102"/>
+            <rect key="screenRect" x="0.0" y="0.0" width="2560" height="1418"/>
+            <view key="contentView" wantsLayer="YES" id="EiT-Mj-1SZ">
+                <rect key="frame" x="0.0" y="0.0" width="320" height="102"/>
+                <autoresizingMask key="autoresizingMask"/>
+                <subviews>
+                    <textField horizontalHuggingPriority="251" verticalHuggingPriority="750" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="a1k-tn-KC1">
+                        <rect key="frame" x="20" y="64" width="60" height="17"/>
+                        <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
+                        <textFieldCell key="cell" scrollable="YES" lineBreakMode="clipping" sendsActionOnEndEditing="YES" title="Show on:" id="jOB-rY-MKy">
+                            <font key="font" metaFont="system"/>
+                            <color key="textColor" name="labelColor" catalog="System" colorSpace="catalog"/>
+                            <color key="backgroundColor" name="controlColor" catalog="System" colorSpace="catalog"/>
+                        </textFieldCell>
+                    </textField>
+                    <popUpButton verticalHuggingPriority="750" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="osi-OU-YaU">
+                        <rect key="frame" x="84" y="58" width="219" height="26"/>
+                        <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
+                        <popUpButtonCell key="cell" type="push" title="Primary Display" bezelStyle="rounded" alignment="left" lineBreakMode="truncatingTail" state="on" borderStyle="borderAndBezel" imageScaling="proportionallyDown" inset="2" selectedItem="z3J-9s-f75" id="oq1-VZ-McK">
+                            <behavior key="behavior" lightByBackground="YES" lightByGray="YES"/>
+                            <font key="font" metaFont="menu"/>
+                            <menu key="menu" id="nCe-1g-6sV">
+                                <items>
+                                    <menuItem title="Primary Display" state="on" id="z3J-9s-f75"/>
+                                    <menuItem title="Last Focussed Display" tag="1" id="5Rz-jw-XVj"/>
+                                    <menuItem title="All Displays" tag="2" id="uUG-c0-HaR"/>
+                                </items>
+                            </menu>
+                        </popUpButtonCell>
+                    </popUpButton>
+                    <button verticalHuggingPriority="750" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="1Od-P9-lod">
+                        <rect key="frame" x="225" y="13" width="81" height="32"/>
+                        <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
+                        <buttonCell key="cell" type="push" title="OK" bezelStyle="rounded" alignment="center" borderStyle="border" imageScaling="proportionallyDown" inset="2" id="Mho-c8-3n8">
+                            <behavior key="behavior" pushIn="YES" lightByBackground="YES" lightByGray="YES"/>
+                            <font key="font" metaFont="system"/>
+                            <string key="keyEquivalent" base64-UTF8="YES">
+DQ
+</string>
+                        </buttonCell>
+                        <connections>
+                            <action selector="okClick:" target="-2" id="eti-FD-ctD"/>
+                        </connections>
+                    </button>
+                    <button verticalHuggingPriority="750" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="OoO-CW-4EW">
+                        <rect key="frame" x="144" y="13" width="81" height="32"/>
+                        <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
+                        <buttonCell key="cell" type="push" title="Cancel" bezelStyle="rounded" alignment="center" borderStyle="border" imageScaling="proportionallyDown" inset="2" id="o2L-6m-4TE">
+                            <behavior key="behavior" pushIn="YES" lightByBackground="YES" lightByGray="YES"/>
+                            <font key="font" metaFont="system"/>
+                            <string key="keyEquivalent" base64-UTF8="YES">
+Gw
+</string>
+                            <connections>
+                                <action selector="cancelClick:" target="-2" id="BMF-tx-aGR"/>
+                            </connections>
+                        </buttonCell>
+                    </button>
+                </subviews>
+            </view>
+            <point key="canvasLocation" x="34" y="50"/>
+        </window>
+    </objects>
+</document>

Epoch Flip Clock.xcodeproj/project.pbxproj

@@ -11,6 +11,9 @@
 		3A40068318B53129005F43A6 /* WebKit.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 3A40068218B53129005F43A6 /* WebKit.framework */; };
 		77996CD91C94B825006B0FF7 /* EpochFlipClock.m in Sources */ = {isa = PBXBuildFile; fileRef = 77996CD81C94B825006B0FF7 /* EpochFlipClock.m */; };
 		77AD4D2D2041D6A9001100EC /* Webview in Resources */ = {isa = PBXBuildFile; fileRef = 77AD4D2C2041D6A9001100EC /* Webview */; };
+		77AD4D2F2041DBC6001100EC /* ConfigureSheet.xib in Resources */ = {isa = PBXBuildFile; fileRef = 77AD4D2E2041DBC6001100EC /* ConfigureSheet.xib */; };
+		77AD4D312041E44A001100EC /* AppKit.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 77AD4D302041E44A001100EC /* AppKit.framework */; };
+		77AD4D332041F756001100EC /* Cocoa.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 77AD4D322041F756001100EC /* Cocoa.framework */; };
 /* End PBXBuildFile section */
 
 /* Begin PBXFileReference section */
@@ -21,6 +24,9 @@
 		77996CD61C94B804006B0FF7 /* Info.plist */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text.plist.xml; path = Info.plist; sourceTree = SOURCE_ROOT; };
 		77996CD81C94B825006B0FF7 /* EpochFlipClock.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = EpochFlipClock.m; sourceTree = SOURCE_ROOT; };
 		77AD4D2C2041D6A9001100EC /* Webview */ = {isa = PBXFileReference; lastKnownFileType = folder; path = Webview; sourceTree = "<group>"; };
+		77AD4D2E2041DBC6001100EC /* ConfigureSheet.xib */ = {isa = PBXFileReference; lastKnownFileType = file.xib; path = ConfigureSheet.xib; sourceTree = "<group>"; };
+		77AD4D302041E44A001100EC /* AppKit.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = AppKit.framework; path = System/Library/Frameworks/AppKit.framework; sourceTree = SDKROOT; };
+		77AD4D322041F756001100EC /* Cocoa.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = Cocoa.framework; path = System/Library/Frameworks/Cocoa.framework; sourceTree = SDKROOT; };
 /* End PBXFileReference section */
 
 /* Begin PBXFrameworksBuildPhase section */
@@ -28,6 +34,8 @@
 			isa = PBXFrameworksBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
+				77AD4D332041F756001100EC /* Cocoa.framework in Frameworks */,
+				77AD4D312041E44A001100EC /* AppKit.framework in Frameworks */,
 				3A40068318B53129005F43A6 /* WebKit.framework in Frameworks */,
 				3A40066E18B53113005F43A6 /* ScreenSaver.framework in Frameworks */,
 			);
@@ -56,6 +64,8 @@
 		3A40066A18B53112005F43A6 /* Frameworks */ = {
 			isa = PBXGroup;
 			children = (
+				77AD4D322041F756001100EC /* Cocoa.framework */,
+				77AD4D302041E44A001100EC /* AppKit.framework */,
 				3A40068218B53129005F43A6 /* WebKit.framework */,
 				3A40066D18B53113005F43A6 /* ScreenSaver.framework */,
 			);
@@ -69,6 +79,7 @@
 				3A95A94B18EA12D30036779C /* EpochFlipClock.h */,
 				77996CD81C94B825006B0FF7 /* EpochFlipClock.m */,
 				77996CD61C94B804006B0FF7 /* Info.plist */,
+				77AD4D2E2041DBC6001100EC /* ConfigureSheet.xib */,
 			);
 			name = Source;
 			sourceTree = "<group>";
@@ -142,6 +153,7 @@
 			buildActionMask = 2147483647;
 			files = (
 				77AD4D2D2041D6A9001100EC /* Webview in Resources */,
+				77AD4D2F2041DBC6001100EC /* ConfigureSheet.xib in Resources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};

EpochFlipClock.h

@@ -1,4 +1,8 @@
 #import <ScreenSaver/ScreenSaver.h>
 
 @interface EpochFlipClock : ScreenSaverView
+{
+    IBOutlet id configSheet;
+    IBOutlet id screenDisplayOption;
+}
 @end

EpochFlipClock.m

@@ -3,15 +3,53 @@
 
 @implementation EpochFlipClock
 
+static NSString * const epochFlipClockModule = @"com.epochflipclock";
+
 - (id)initWithFrame:(NSRect)frame isPreview:(BOOL)isPreview {
     if (!(self = [super initWithFrame:frame isPreview:isPreview])) return nil;
     
+    // Preference Defaults
+    ScreenSaverDefaults *defaults;
+    defaults = [ScreenSaverDefaults defaultsForModuleWithName:epochFlipClockModule];
+    
+    [defaults registerDefaults:[NSDictionary dictionaryWithObjectsAndKeys:
+        @"0", @"screenDisplayOption", // Default to show only on primary display
+        nil]];
+    
+    // Webview
     NSURL* indexHTMLDocumentURL = [NSURL URLWithString:[[[NSURL fileURLWithPath:[[NSBundle bundleForClass:self.class].resourcePath stringByAppendingString:@"/Webview/index.html"] isDirectory:NO] description] stringByAppendingFormat:@"?screensaver=1%@", self.isPreview ? @"&is_preview=1" : @""]];
 
     WebView* webView = [[WebView alloc] initWithFrame:NSMakeRect(0, 0, frame.size.width, frame.size.height)];
     webView.drawsBackground = NO; // Avoids a "white flash" just before the index.html file has loaded
     [webView.mainFrame loadRequest:[NSURLRequest requestWithURL:indexHTMLDocumentURL cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:30.0]];
+    
+    // Show on screens based on preferences
+    NSArray* screens = [NSScreen screens];
+    NSScreen* primaryScreen = [screens objectAtIndex:0];
+    
+    switch ([defaults integerForKey:@"screenDisplayOption"]) {
+        // Primary screen (System Preferences > Displays).
+        // The screen the menubar is shown on under 'arrangement'
+        case 0:
+            if ((primaryScreen.frame.origin.x == frame.origin.x) || isPreview) {
                 [self addSubview:webView];
+            }
+            break;
+        // Last Focussed Screen
+        // This _sometimes_ results in nothing being shown when previewing in system prefs.
+        case 1:
+            if (([NSScreen mainScreen].frame.origin.x == frame.origin.x) || isPreview) {
+                [self addSubview:webView];
+            }
+            break;
+        // All Screens
+        case 2:
+            [self addSubview:webView];
+            break;
+        default:
+            [self addSubview:webView];
+            break;
+    }
 
     return self;
 }
@@ -19,7 +57,50 @@
 #pragma mark - ScreenSaverView
 
 - (void)animateOneFrame { [self stopAnimation]; }
-- (BOOL)hasConfigureSheet { return NO; }
+
+#pragma mark - Config
+// http://cocoadevcentral.com/articles/000088.php
+
+- (BOOL)hasConfigureSheet { return YES; }
+
+- (NSWindow *)configureSheet
+{
+    ScreenSaverDefaults *defaults;
+    defaults = [ScreenSaverDefaults defaultsForModuleWithName:epochFlipClockModule];
+    
+    if (!configSheet)
+    {
+        if (![NSBundle loadNibNamed:@"ConfigureSheet" owner:self])
+        {
+            NSLog( @"Failed to load configure sheet." );
+        }
+    }
+    
+    [screenDisplayOption selectItemAtIndex:[defaults integerForKey:@"screenDisplayOption"]];
+
+    return configSheet;
+}
+
+- (IBAction)cancelClick:(id)sender
+{
+    [[NSApplication sharedApplication] endSheet:configSheet];
+}
+
+- (IBAction) okClick: (id)sender
+{
+    ScreenSaverDefaults *defaults;
+    defaults = [ScreenSaverDefaults defaultsForModuleWithName:epochFlipClockModule];
+    
+    // Update our defaults
+    [defaults setInteger:[screenDisplayOption indexOfSelectedItem]
+               forKey:@"screenDisplayOption"];
+    
+    // Save the settings to disk
+    [defaults synchronize];
+    
+    // Close the sheet
+    [[NSApplication sharedApplication] endSheet:configSheet];
+}
 
 #pragma mark - WebFrameLoadDelegate