1 /* 2 * Copyright (C) 2010 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.gallery3d.ui; 18 19 import android.graphics.Rect; 20 import android.view.View.MeasureSpec; 21 22 class MeasureHelper { 23 24 private static MeasureHelper sInstance = new MeasureHelper(null); 25 26 private GLView mComponent; 27 private int mPreferredWidth; 28 private int mPreferredHeight; 29 MeasureHelper(GLView component)30 private MeasureHelper(GLView component) { 31 mComponent = component; 32 } 33 getInstance(GLView component)34 public static MeasureHelper getInstance(GLView component) { 35 sInstance.mComponent = component; 36 return sInstance; 37 } 38 setPreferredContentSize(int width, int height)39 public MeasureHelper setPreferredContentSize(int width, int height) { 40 mPreferredWidth = width; 41 mPreferredHeight = height; 42 return this; 43 } 44 measure(int widthSpec, int heightSpec)45 public void measure(int widthSpec, int heightSpec) { 46 Rect p = mComponent.getPaddings(); 47 setMeasuredSize( 48 getLength(widthSpec, mPreferredWidth + p.left + p.right), 49 getLength(heightSpec, mPreferredHeight + p.top + p.bottom)); 50 } 51 getLength(int measureSpec, int prefered)52 private static int getLength(int measureSpec, int prefered) { 53 int specLength = MeasureSpec.getSize(measureSpec); 54 switch(MeasureSpec.getMode(measureSpec)) { 55 case MeasureSpec.EXACTLY: return specLength; 56 case MeasureSpec.AT_MOST: return Math.min(prefered, specLength); 57 default: return prefered; 58 } 59 } 60 setMeasuredSize(int width, int height)61 protected void setMeasuredSize(int width, int height) { 62 mComponent.setMeasuredSize(width, height); 63 } 64 65 } 66