Add to layoutlib_api the ability to do layout only.

This lets the session do the measure/layout part and skip
the draw.

This returns the object location through the ViewInfo but
not the rendering.

Change-Id: I8875b4631b5fb00efa7096d804129612d46d9dc9

2 files changed, 66 insertions, 59 deletions

diff --git a/layoutlib_api/src/com/android/ide/common/rendering/api/Capability.java b/layoutlib_api/src/com/android/ide/common/rendering/api/Capability.java
index ff6777b..ec4cf38 100644
--- a/layoutlib_api/src/com/android/ide/common/rendering/api/Capability.java
+++ b/layoutlib_api/src/com/android/ide/common/rendering/api/Capability.java
@@ -28,6 +28,10 @@ public enum Capability {
     CUSTOM_BACKGROUND_COLOR,
     /** Ability to call {@link LayoutScene#render()} and {@link LayoutScene#render(long)}. */
     RENDER,
+    /** Ability to ask for a layout only with no rendering through
+     * {@link SessionParams#setLayoutOnly()}
+     */
+    LAYOUT_ONLY,
     /**
      * Ability to control embedded layout parsers through {@link IXmlPullParser#getParser(String)}
      */
@@ -39,7 +43,6 @@ public enum Capability {
      * {@link LayoutScene#setProperty(Object, String, String)}<br>
      * The method that receives an animation listener can only use it if the
      * ANIMATED_VIEW_MANIPULATION, or FULL_ANIMATED_VIEW_MANIPULATION is also supported.
-     *
      * */
     VIEW_MANIPULATION,
     /** Ability to play animations with<br>
diff --git a/layoutlib_api/src/com/android/ide/common/rendering/api/SessionParams.java b/layoutlib_api/src/com/android/ide/common/rendering/api/SessionParams.java
index 9446ff5..826e70d 100644
--- a/layoutlib_api/src/com/android/ide/common/rendering/api/SessionParams.java
+++ b/layoutlib_api/src/com/android/ide/common/rendering/api/SessionParams.java
@@ -20,7 +20,6 @@ import com.android.resources.Density;
 
 /**
  * Rendering parameters for a {@link RenderSession}.
- *
  */
 public class SessionParams extends RenderParams {
 
@@ -50,66 +49,71 @@ public class SessionParams extends RenderParams {
 
     private final ILayoutPullParser mLayoutDescription;
     private final RenderingMode mRenderingMode;
+    private boolean mLayoutOnly = false;
 
     /**
-    *
-    * @param layoutDescription the {@link ILayoutPullParser} letting the LayoutLib Bridge visit the
-    * layout file.
-    * @param renderingMode The rendering mode.
-    * @param projectKey An Object identifying the project. This is used for the cache mechanism.
-    * @param screenWidth the screen width
-    * @param screenHeight the screen height
-    * @param density the density factor for the screen.
-    * @param xdpi the screen actual dpi in X
-    * @param ydpi the screen actual dpi in Y
-    * @param themeName The name of the theme to use.
-    * @param isProjectTheme true if the theme is a project theme, false if it is a framework theme.
-    * @param projectResources the resources of the project. The map contains (String, map) pairs
-    * where the string is the type of the resource reference used in the layout file, and the
-    * map contains (String, {@link ResourceValue}) pairs where the key is the resource name,
-    * and the value is the resource value.
-    * @param frameworkResources the framework resources. The map contains (String, map) pairs
-    * where the string is the type of the resource reference used in the layout file, and the map
-    * contains (String, {@link ResourceValue}) pairs where the key is the resource name, and the
-    * value is the resource value.
-    * @param projectCallback The {@link IProjectCallback} object to get information from
-    * the project.
-    * @param minSdkVersion the minSdkVersion of the project
-    * @param targetSdkVersion the targetSdkVersion of the project
-    * @param log the object responsible for displaying warning/errors to the user.
-    */
-   public SessionParams(
-           ILayoutPullParser layoutDescription,
-           RenderingMode renderingMode,
-           Object projectKey,
-           int screenWidth, int screenHeight,
-           Density density, float xdpi, float ydpi,
-           RenderResources renderResources,
-           IProjectCallback projectCallback,
-           int minSdkVersion, int targetSdkVersion,
-           LayoutLog log) {
-       super(projectKey, screenWidth, screenHeight, density, xdpi, ydpi,
-               renderResources, projectCallback, minSdkVersion, targetSdkVersion, log);
-
-       mLayoutDescription = layoutDescription;
-       mRenderingMode = renderingMode;
-
-   }
-
-   public SessionParams(SessionParams params) {
-       super(params);
-       mLayoutDescription = params.mLayoutDescription;
-       mRenderingMode = params.mRenderingMode;
-   }
-
-   public ILayoutPullParser getLayoutDescription() {
-       return mLayoutDescription;
-   }
-
-   public RenderingMode getRenderingMode() {
-       return mRenderingMode;
-   }
+     *
+     * @param layoutDescription the {@link ILayoutPullParser} letting the LayoutLib Bridge visit the
+     * layout file.
+     * @param renderingMode The rendering mode.
+     * @param projectKey An Object identifying the project. This is used for the cache mechanism.
+     * @param screenWidth the screen width
+     * @param screenHeight the screen height
+     * @param density the density factor for the screen.
+     * @param xdpi the screen actual dpi in X
+     * @param ydpi the screen actual dpi in Y
+     * @param themeName The name of the theme to use.
+     * @param isProjectTheme true if the theme is a project theme, false if it is a framework theme.
+     * @param projectResources the resources of the project. The map contains (String, map) pairs
+     * where the string is the type of the resource reference used in the layout file, and the
+     * map contains (String, {@link ResourceValue}) pairs where the key is the resource name,
+     * and the value is the resource value.
+     * @param frameworkResources the framework resources. The map contains (String, map) pairs
+     * where the string is the type of the resource reference used in the layout file, and the map
+     * contains (String, {@link ResourceValue}) pairs where the key is the resource name, and the
+     * value is the resource value.
+     * @param projectCallback The {@link IProjectCallback} object to get information from
+     * the project.
+     * @param minSdkVersion the minSdkVersion of the project
+     * @param targetSdkVersion the targetSdkVersion of the project
+     * @param log the object responsible for displaying warning/errors to the user.
+     */
+    public SessionParams(
+            ILayoutPullParser layoutDescription,
+            RenderingMode renderingMode,
+            Object projectKey,
+            int screenWidth, int screenHeight,
+            Density density, float xdpi, float ydpi,
+            RenderResources renderResources,
+            IProjectCallback projectCallback,
+            int minSdkVersion, int targetSdkVersion,
+            LayoutLog log) {
+        super(projectKey, screenWidth, screenHeight, density, xdpi, ydpi,
+                renderResources, projectCallback, minSdkVersion, targetSdkVersion, log);
+
+        mLayoutDescription = layoutDescription;
+        mRenderingMode = renderingMode;
+    }
 
+    public SessionParams(SessionParams params) {
+        super(params);
+        mLayoutDescription = params.mLayoutDescription;
+        mRenderingMode = params.mRenderingMode;
+    }
 
+    public ILayoutPullParser getLayoutDescription() {
+        return mLayoutDescription;
+    }
 
+    public RenderingMode getRenderingMode() {
+        return mRenderingMode;
+    }
+
+    public void setLayoutOnly() {
+        mLayoutOnly = true;
+    }
+
+    public boolean isLayoutOnly() {
+        return mLayoutOnly;
+    }
 }