[ease] Added utility function for finding paths in data dirs.

[Nate Stedman <natesm src gnome org>]

commit 7f71972d5a6adf2a3bb57f874637802c5d44284e
Author: Nate Stedman <natesm gmail com>
Date:   Fri Jun 11 02:34:46 2010 -0400

    Added utility function for finding paths in data dirs.
    
    - Used this function to find handle SVGs properly
    - Renamed ErrorDialog.vala to a generic Utility.vala

 Makefile.am                            |    2 +-
 src/Handle.vala                        |   10 +++++-----
 src/{ErrorDialog.vala => Utility.vala} |   23 +++++++++++++++++++++++
 3 files changed, 29 insertions(+), 6 deletions(-)
---
diff --git a/Makefile.am b/Makefile.am
index cabcab6..b6651b5 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -21,7 +21,6 @@ ease_SOURCES = \
 	src/ElementMapValue.vala \
 	src/Element.vala \
 	src/Enums.vala \
-	src/ErrorDialog.vala \
 	src/Handle.vala \
 	src/HTMLExporter.vala \
 	src/ImageActor.vala \
@@ -51,6 +50,7 @@ ease_SOURCES = \
 	src/Transitions.vala \
 	src/UndoActions.vala \
 	src/UndoController.vala \
+	src/Utility.vala \
 	src/VideoActor.vala \
 	src/VideoElement.vala \
 	src/WelcomeActor.vala \
diff --git a/src/Handle.vala b/src/Handle.vala
index d8eb9e7..534a909 100644
--- a/src/Handle.vala
+++ b/src/Handle.vala
@@ -33,12 +33,12 @@ public class Ease.Handle : Clutter.Texture
 	/**
 	 * The path to the white circle with a black border.
 	 */
-	public const string W_PATH = "/usr/local/share/ease/svg/handle-white.svg";
+	public const string W_PATH = "ease/svg/handle-white.svg";
 	
 	/**
 	 * The path to the black circle with a white border.
 	 */
-	public const string B_PATH = "/usr/local/share/ease/svg/handle-black.svg";
+	public const string B_PATH = "ease/svg/handle-black.svg";
 	
 	/**
 	 * Creates a Handle. Does automatically set the Handle's position - call
@@ -53,7 +53,7 @@ public class Ease.Handle : Clutter.Texture
 		position = pos;
 
 		// load the handle texture
-		filename = W_PATH;
+		filename = data_path(W_PATH);
 
 		// set the handle's anchor
 		set_anchor_point(width / 2, height / 2);
@@ -229,11 +229,11 @@ public class Ease.Handle : Clutter.Texture
 	{
 		if (flipped)
 		{
-			filename = W_PATH;
+			filename = data_path(W_PATH);
 		}
 		else
 		{
-			filename = B_PATH;
+			filename = data_path(B_PATH);
 		}
 		
 		flipped = !flipped;
diff --git a/src/ErrorDialog.vala b/src/Utility.vala
similarity index 71%
rename from src/ErrorDialog.vala
rename to src/Utility.vala
index e6b5cbf..89453f6 100644
--- a/src/ErrorDialog.vala
+++ b/src/Utility.vala
@@ -34,4 +34,27 @@ namespace Ease
 		dialog.run();
 		dialog.destroy();
 	}
+	
+	/**
+	 * Finds the given path in the data directories (ie /usr/share). Return null
+	 * if the path cannot be found.
+	 *
+	 * @param path The path to search for.
+	 */
+	public string? data_path(string path)
+	{
+		string[] data_dirs = Environment.get_system_data_dirs();
+		foreach (string dir in data_dirs)
+		{
+			var filename = Path.build_filename(dir, path);
+			var file = File.new_for_path(filename);
+			
+			if (file.query_exists(null))
+			{
+				return filename;
+			}
+		}
+		
+		return null;
+	}
 }