android/source/src/java/org/mozilla/gecko/gfx/ViewportMetrics.java

   1 /* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
   2  * This Source Code Form is subject to the terms of the Mozilla Public
   3  * License, v. 2.0. If a copy of the MPL was not distributed with this
   4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   5
   6 package org.mozilla.gecko.gfx;
   7
   8 import android.graphics.PointF;
   9 import android.graphics.RectF;
  10 import android.util.DisplayMetrics;
  11
  12 import org.json.JSONException;
  13 import org.json.JSONObject;
  14
  15 /**
  16  * ViewportMetrics manages state and contains some utility functions related to
  17  * the page viewport for the Gecko layer client to use.
  18  */
  19 public class ViewportMetrics {
  20     private static final String LOGTAG = "GeckoViewportMetrics";
  21
  22     private RectF mPageRect;
  23     private RectF mCssPageRect;
  24     private RectF mViewportRect;
  25     private float mZoomFactor;
  26
  27     public ViewportMetrics(DisplayMetrics metrics) {
  28         mPageRect = new RectF(0, 0, metrics.widthPixels, metrics.heightPixels);
  29         mCssPageRect = new RectF(0, 0, metrics.widthPixels, metrics.heightPixels);
  30         mViewportRect = new RectF(0, 0, metrics.widthPixels, metrics.heightPixels);
  31         mZoomFactor = 1.0f;
  32     }
  33
  34     public ViewportMetrics(ViewportMetrics viewport) {
  35         mPageRect = new RectF(viewport.getPageRect());
  36         mCssPageRect = new RectF(viewport.getCssPageRect());
  37         mViewportRect = new RectF(viewport.getViewport());
  38         mZoomFactor = viewport.getZoomFactor();
  39     }
  40
  41     public ViewportMetrics(ImmutableViewportMetrics viewport) {
  42         mPageRect = new RectF(viewport.pageRectLeft,
  43                 viewport.pageRectTop,
  44                 viewport.pageRectRight,
  45                 viewport.pageRectBottom);
  46         mCssPageRect = new RectF(viewport.cssPageRectLeft,
  47                 viewport.cssPageRectTop,
  48                 viewport.cssPageRectRight,
  49                 viewport.cssPageRectBottom);
  50         mViewportRect = new RectF(viewport.viewportRectLeft,
  51                 viewport.viewportRectTop,
  52                 viewport.viewportRectRight,
  53                 viewport.viewportRectBottom);
  54         mZoomFactor = viewport.zoomFactor;
  55     }
  56
  57     public ViewportMetrics(JSONObject json) throws JSONException {
  58         float x = (float)json.getDouble("x");
  59         float y = (float)json.getDouble("y");
  60         float width = (float)json.getDouble("width");
  61         float height = (float)json.getDouble("height");
  62         float pageLeft = (float)json.getDouble("pageLeft");
  63         float pageTop = (float)json.getDouble("pageTop");
  64         float pageRight = (float)json.getDouble("pageRight");
  65         float pageBottom = (float)json.getDouble("pageBottom");
  66         float cssPageLeft = (float)json.getDouble("cssPageLeft");
  67         float cssPageTop = (float)json.getDouble("cssPageTop");
  68         float cssPageRight = (float)json.getDouble("cssPageRight");
  69         float cssPageBottom = (float)json.getDouble("cssPageBottom");
  70         float zoom = (float)json.getDouble("zoom");
  71
  72         mPageRect = new RectF(pageLeft, pageTop, pageRight, pageBottom);
  73         mCssPageRect = new RectF(cssPageLeft, cssPageTop, cssPageRight, cssPageBottom);
  74         mViewportRect = new RectF(x, y, x + width, y + height);
  75         mZoomFactor = zoom;
  76     }
  77
  78     public ViewportMetrics(float x, float y, float width, float height,
  79                            float pageLeft, float pageTop, float pageRight, float pageBottom,
  80                            float cssPageLeft, float cssPageTop, float cssPageRight, float cssPageBottom,
  81                            float zoom) {
  82         mPageRect = new RectF(pageLeft, pageTop, pageRight, pageBottom);
  83         mCssPageRect = new RectF(cssPageLeft, cssPageTop, cssPageRight, cssPageBottom);
  84         mViewportRect = new RectF(x, y, x + width, y + height);
  85         mZoomFactor = zoom;
  86     }
  87
  88     public PointF getOrigin() {
  89         return new PointF(mViewportRect.left, mViewportRect.top);
  90     }
  91
  92     public FloatSize getSize() {
  93         return new FloatSize(mViewportRect.width(), mViewportRect.height());
  94     }
  95
  96     public RectF getViewport() {
  97         return mViewportRect;
  98     }
  99
 100     public RectF getCssViewport() {
 101         return RectUtils.scale(mViewportRect, 1/mZoomFactor);
 102     }
 103
 104     public RectF getPageRect() {
 105         return mPageRect;
 106     }
 107
 108     public RectF getCssPageRect() {
 109         return mCssPageRect;
 110     }
 111
 112     public float getZoomFactor() {
 113         return mZoomFactor;
 114     }
 115
 116     public void setPageRect(RectF pageRect, RectF cssPageRect) {
 117         mPageRect = pageRect;
 118         mCssPageRect = cssPageRect;
 119     }
 120
 121     public void setViewport(RectF viewport) {
 122         mViewportRect = viewport;
 123     }
 124
 125     public void setOrigin(PointF origin) {
 126         mViewportRect.set(origin.x, origin.y,
 127                           origin.x + mViewportRect.width(),
 128                           origin.y + mViewportRect.height());
 129     }
 130
 131     public void setSize(FloatSize size) {
 132         mViewportRect.right = mViewportRect.left + size.width;
 133         mViewportRect.bottom = mViewportRect.top + size.height;
 134     }
 135
 136     public void setZoomFactor(float zoomFactor) {
 137         mZoomFactor = zoomFactor;
 138     }
 139
 140     public String toJSON() {
 141         // Round off height and width. Since the height and width are the size of the screen, it
 142         // makes no sense to send non-integer coordinates to Gecko.
 143         int height = Math.round(mViewportRect.height());
 144         int width = Math.round(mViewportRect.width());
 145
 146         StringBuffer sb = new StringBuffer(512);
 147         sb.append("{ \"x\" : ").append(mViewportRect.left)
 148           .append(", \"y\" : ").append(mViewportRect.top)
 149           .append(", \"width\" : ").append(width)
 150           .append(", \"height\" : ").append(height)
 151           .append(", \"pageLeft\" : ").append(mPageRect.left)
 152           .append(", \"pageTop\" : ").append(mPageRect.top)
 153           .append(", \"pageRight\" : ").append(mPageRect.right)
 154           .append(", \"pageBottom\" : ").append(mPageRect.bottom)
 155           .append(", \"cssPageLeft\" : ").append(mCssPageRect.left)
 156           .append(", \"cssPageTop\" : ").append(mCssPageRect.top)
 157           .append(", \"cssPageRight\" : ").append(mCssPageRect.right)
 158           .append(", \"cssPageBottom\" : ").append(mCssPageRect.bottom)
 159           .append(", \"zoom\" : ").append(mZoomFactor)
 160           .append(" }");
 161         return sb.toString();
 162     }
 163
 164     @Override
 165     public String toString() {
 166         StringBuffer buff = new StringBuffer(256);
 167         buff.append("v=").append(mViewportRect.toString())
 168             .append(" p=").append(mPageRect.toString())
 169             .append(" c=").append(mCssPageRect.toString())
 170             .append(" z=").append(mZoomFactor);
 171         return buff.toString();
 172     }
 173 }