JAL-2738 copy to spikes/mungo

[jalview.git] / src / jalview / util / Platform.java

diff --git a/src/jalview/util/Platform.java b/src/jalview/util/Platform.java
index 85a27f6..2c74609 100644 (file)
--- a/src/jalview/util/Platform.java
+++ b/src/jalview/util/Platform.java
@@ -30,6 +30,10 @@ import java.awt.event.MouseEvent;
  */
 public class Platform
 {
+  private static Boolean isAMac = null, isWindows = null;
+
+  private static Boolean isHeadless = null;
+
   /**
    * sorry folks - Macs really are different
    * 
@@ -37,15 +41,40 @@ public class Platform
    */
   public static boolean isAMac()
   {
-    return java.lang.System.getProperty("os.name").indexOf("Mac") > -1;
+    if (isAMac == null)
+    {
+      isAMac = System.getProperty("os.name").indexOf("Mac") > -1;
+    }
+
+    return isAMac.booleanValue();
 
   }
 
-  public static boolean isHeadless()
+  /**
+   * Check if we are on a Microsoft plaform...
+   * 
+   * @return true if we have to cope with another platform variation
+   */
+  public static boolean isWindows()
   {
-    String hdls = java.lang.System.getProperty("java.awt.headless");
+    if (isWindows == null)
+    {
+      isWindows = System.getProperty("os.name").indexOf("Win") > -1;
+    }
+    return isWindows.booleanValue();
+  }
 
-    return hdls != null && hdls.equals("true");
+  /**
+   * 
+   * @return true if we are running in non-interactive no UI mode
+   */
+  public static boolean isHeadless()
+  {
+    if (isHeadless == null)
+    {
+      isHeadless = "true".equals(System.getProperty("java.awt.headless"));
+    }
+    return isHeadless;
   }
 
   /**
@@ -79,18 +108,40 @@ public class Platform
   }
 
   /**
-   * Answers true if the mouse event has Meta-down (on Mac) or Ctrl-down (on
-   * other o/s)
+   * Answers true if the mouse event has Meta-down (Command key on Mac) or
+   * Ctrl-down (on other o/s). Note this answers _false_ if the Ctrl key is
+   * pressed instead of the Meta/Cmd key on Mac. To test for Ctrl-click on Mac,
+   * you can use e.isPopupTrigger().
    * 
    * @param e
    * @return
    */
   public static boolean isControlDown(MouseEvent e)
   {
-    if (isAMac())
+    boolean aMac = isAMac();
+    return isControlDown(e, aMac);
+  }
+
+  /**
+   * Overloaded version of method (to allow unit testing)
+   * 
+   * @param e
+   * @param aMac
+   * @return
+   */
+  protected static boolean isControlDown(MouseEvent e, boolean aMac)
+  {
+    if (aMac)
     {
-      return (Toolkit.getDefaultToolkit().getMenuShortcutKeyMask() & e
-              .getModifiers()) != 0;
+      /*
+       * answer false for right mouse button
+       */
+      if (e.isPopupTrigger())
+      {
+        return false;
+      }
+      return (Toolkit.getDefaultToolkit().getMenuShortcutKeyMask()
+              & e.getModifiers()) != 0;
       // could we use e.isMetaDown() here?
     }
     return e.isControlDown();