function OnFocus () : void

Description

Called when the window gets keyboard focus.

See Also: OnLostFocus.

Preview your camera in ortographic mode when you select the window.

    // Simple script that lets you preview your main camera in Orthographic view
    // when selected.
    
    class OrthographicPreviewer extends EditorWindow {
        var renderTexture : RenderTexture;
        var camera = Camera.main;
        @MenuItem("Example/Camera Selector")
        static function Init() {
            var window = GetWindow(OrthographicPreviewer);
            window.Show();
        }
        function Awake () {
            renderTexture = 
                new RenderTexture(position.width, position.height, RenderTextureFormat.ARGB32 );
        }
        function OnInspectorUpdate() {
            this.Repaint();
        }
        function OnGUI() {
            if(GUILayout.Button("Close")) {
                camera.orthographic = false;
                this.Close();
            }
            GUI.DrawTexture(Rect( 0.0f, 50.0f, position.width, position.height), renderTexture);
        }
        function OnFocus() {
            Selection.activeTransform = camera.transform;
            camera.orthographic = true;
        }
        function Update() {
            if(camera != null) {
                camera.targetTexture = renderTexture;
                camera.Render();
                camera.targetTexture = null;    
            }
            if(renderTexture.width != position.width || renderTexture.height != position.height)
                renderTexture = new RenderTexture(position.width, 
                                        position.height, 
                                        RenderTextureFormat.ARGB32 );
        }
        function OnLostFocus() {
            camera.orthographic = false;
        }
    }