Popup a share menu on clicking the Share toolbar item. Fix #40.

Evergreen.xcodeproj/project.pbxproj

@@ -588,7 +588,6 @@
 				849A977C1ED9EC42007D329B /* Detail */,
 				849A97551ED9EAC3007D329B /* Add Feed */,
 				849A97411ED9EAA9007D329B /* Add Folder */,
-				84AFBB3A1FBE76D800BA41CF /* PanicButton */,
 			);
 			name = MainWindow;
 			path = Evergreen/MainWindow;
@@ -916,13 +915,6 @@
 			path = Evergreen/Dinosaurs;
 			sourceTree = "<group>";
 		};
-		84AFBB3A1FBE76D800BA41CF /* PanicButton */ = {
-			isa = PBXGroup;
-			children = (
-			);
-			path = PanicButton;
-			sourceTree = "<group>";
-		};
 		84B06F971ED37DA000F0B54B /* Products */ = {
 			isa = PBXGroup;
 			children = (

Evergreen/Base.lproj/MainWindow.storyboard

@@ -32,7 +32,7 @@
                                         </searchFieldCell>
                                     </searchField>
                                 </toolbarItem>
-                                <toolbarItem implicitItemIdentifier="C3050605-E4B0-40CB-BA19-F64DF68BCFFA" label="Share" paletteLabel="Share" toolTip="Share" image="NSShareTemplate" id="nv0-Ju-lP7" customClass="RSToolbarItem" customModule="RSCore">
+                                <toolbarItem implicitItemIdentifier="C3050605-E4B0-40CB-BA19-F64DF68BCFFA" explicitItemIdentifier="share" label="Share" paletteLabel="Share" toolTip="Share" image="NSShareTemplate" id="nv0-Ju-lP7" customClass="RSToolbarItem" customModule="RSCore">
                                     <size key="minSize" width="38" height="25"/>
                                     <size key="maxSize" width="38" height="27"/>
                                     <button key="view" verticalHuggingPriority="750" id="ypo-pI-PTN">
@@ -43,6 +43,9 @@
                                             <font key="font" metaFont="system"/>
                                         </buttonCell>
                                     </button>
+                                    <connections>
+                                        <action selector="toolbarShowShareMenu:" target="Oky-zY-oP4" id="zUk-sS-frQ"/>
+                                    </connections>
                                 </toolbarItem>
                                 <toolbarItem implicitItemIdentifier="3552D790-D29C-4BF2-AF02-5BEFE49C7FB9" label="New Feed" paletteLabel="New Feed" toolTip="New Feed" image="NSAddTemplate" id="Skp-5r-70Q" customClass="RSToolbarItem" customModule="RSCore">
                                     <size key="minSize" width="38" height="25"/>
@@ -198,6 +201,9 @@
                                 <toolbarItem reference="YMs-P5-Xhn"/>
                                 <toolbarItem reference="1Ql-WJ-KYi"/>
                             </defaultToolbarItems>
+                            <connections>
+                                <outlet property="delegate" destination="B8D-0N-5wS" id="hrC-d9-Cge"/>
+                            </connections>
                         </toolbar>
                         <connections>
                             <outlet property="delegate" destination="B8D-0N-5wS" id="JSn-lq-Uwe"/>

Evergreen/MainWindow/MainWindowController.swift

@@ -130,6 +130,10 @@ class MainWindowController : NSWindowController, NSUserInterfaceValidations {
 		if item.action == #selector(markOlderArticlesAsRead(_:)) {
 			return canMarkOlderArticlesAsRead()
 		}
+
+		if item.action == #selector(toolbarShowShareMenu(_:)) {
+			return canShowShareMenu()
+		}
 		
 		return true
 	}
@@ -265,6 +269,57 @@ class MainWindowController : NSWindowController, NSUserInterfaceValidations {
 
 		sidebarViewController?.outlineView.selectNextRow(sender)
 	}
+
+	@IBAction func toolbarShowShareMenu(_ sender: Any?) {
+
+		guard let selectedArticles = selectedArticles, !selectedArticles.isEmpty else {
+			assertionFailure("Expected toolbarShowShareMenu to be called only when there are selected articles.")
+			return
+		}
+		guard let shareToolbarItem = shareToolbarItem else {
+			assertionFailure("Expected toolbarShowShareMenu to be called only by the Share item in the toolbar.")
+			return
+		}
+		guard let view = shareToolbarItem.view else {
+			// TODO: handle menu form representation
+			return
+		}
+
+		let items = selectedArticles.map { ArticlePasteboardWriter(article: $0) }
+		let sharingServicePicker = NSSharingServicePicker(items: items)
+		sharingServicePicker.show(relativeTo: view.bounds, of: view, preferredEdge: .minY)
+	}
+
+	private func canShowShareMenu() -> Bool {
+
+		guard let selectedArticles = selectedArticles else {
+			return false
+		}
+		return !selectedArticles.isEmpty
+	}
+}
+
+// MARK: - NSToolbarDelegate
+
+extension NSToolbarItem.Identifier {
+	static let Share = NSToolbarItem.Identifier("share")
+}
+
+extension MainWindowController: NSToolbarDelegate {
+
+	func toolbarWillAddItem(_ notification: Notification) {
+
+		// The share button should send its action on mouse down, not mouse up.
+
+		guard let item = notification.userInfo?["item"] as? NSToolbarItem else {
+			return
+		}
+		guard item.itemIdentifier == .Share, let button = item.view as? NSButton else {
+			return
+		}
+
+		button.sendAction(on: .leftMouseDown)
+	}
 }
 
 // MARK: - Private
@@ -359,6 +414,25 @@ private extension MainWindowController {
 		}
 	}
 
+	// MARK: - Toolbar
+
+	private var shareToolbarItem: NSToolbarItem? {
+		return existingToolbarItem(identifier: .Share)
+	}
+
+	func existingToolbarItem(identifier: NSToolbarItem.Identifier) -> NSToolbarItem? {
+
+		guard let toolbarItems = window?.toolbar?.items else {
+			return nil
+		}
+		for toolbarItem in toolbarItems {
+			if toolbarItem.itemIdentifier == identifier {
+				return toolbarItem
+			}
+		}
+		return nil
+	}
+
 	// MARK: - Navigation
 
 	func handleRightArrowFunctionKey(in view: NSView) {