/* * Copyright (C) 2010 The Android Open Source Project * * Licensed under the Eclipse Public License, Version 1.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.eclipse.org/org/documents/epl-v10.php * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.android.ide.common.api; import com.android.annotations.NonNull; import com.google.common.annotations.Beta; import java.util.List; /** * Metadata about a particular view. The metadata for a View can be found by asking the * {@link IClientRulesEngine} for the metadata for a given class via * {@link IClientRulesEngine#getMetadata}. *

* NOTE: This is not a public or final API; if you rely on this be prepared * to adjust your code for the next tools release. */ @Beta public interface IViewMetadata { /** * Returns the display name views of this type (a name suitable to display to the * user, normally capitalized and usually but not necessarily tied to the * implementation class). To be clear, a specific view may have an id attribute and a * text attribute, neither of these is the display name. Instead, the class * android.widget.ZoomControls may have the display name "Zoom Controls", and an * individual view created into a layout can for example have the id "ZoomControl01". * * @return the user visible name of views of this type (never null) */ @NonNull public String getDisplayName(); /** * Gets the insets for this view * * @return the insets for this view */ @NonNull public Margins getInsets(); /** * Returns the {@link FillPreference} of this view * * @return the {@link FillPreference} of this view, never null but may be * {@link FillPreference#NONE} */ @NonNull public FillPreference getFillPreference(); /** * Returns the most common attributes for this view. * * @return a list of attribute names (not including a namespace prefix) that * are commonly set for this type of view, never null */ @NonNull public List getTopAttributes(); /** * Types of fill behavior that views can prefer. *

* TODO: Consider better names. FillPolicy? Stretchiness? */ public enum FillPreference { /** This view does not want to fill */ NONE, /** This view wants to always fill both horizontal and vertical */ BOTH, /** This view wants to fill horizontally but not vertically */ WIDTH, /** This view wants to fill vertically but not horizontally */ HEIGHT, /** * This view wants to fill in the opposite dimension of the context, e.g. in a * vertical context it wants to fill horizontally, and vice versa */ OPPOSITE, /** This view wants to fill horizontally, but only in a vertical context */ WIDTH_IN_VERTICAL, /** This view wants to fill vertically, but only in a horizontal context */ HEIGHT_IN_HORIZONTAL; /** * Returns true if this view wants to fill horizontally, if the context is * vertical or horizontal as indicated by the parameter. * * @param verticalContext If true, the context is vertical, otherwise it is * horizontal. * @return true if this view wants to fill horizontally */ public boolean fillHorizontally(boolean verticalContext) { return (this == BOTH || this == WIDTH || (verticalContext && (this == OPPOSITE || this == WIDTH_IN_VERTICAL))); } /** * Returns true if this view wants to fill vertically, if the context is * vertical or horizontal as indicated by the parameter. * * @param verticalContext If true, the context is vertical, otherwise it is * horizontal. * @return true if this view wants to fill vertically */ public boolean fillVertically(boolean verticalContext) { return (this == BOTH || this == HEIGHT || (!verticalContext && (this == OPPOSITE || this == HEIGHT_IN_HORIZONTAL))); } } }