The Tor Browser: mobile/android/base/widget/ThumbnailView.java@6474c204b198

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     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 file,

     4  * You can obtain one at http://mozilla.org/MPL/2.0/. */

     6 package org.mozilla.gecko.widget;

     8 import android.content.Context;

     9 import android.graphics.Canvas;

    10 import android.graphics.Matrix;

    11 import android.graphics.drawable.Drawable;

    12 import android.util.AttributeSet;

    13 import android.widget.ImageView;

    15 /* Special version of ImageView for thumbnails. Scales a thumbnail so that it maintains its aspect

    16  * ratio and so that the images width and height are the same size or greater than the view size

    17  */

    18 public class ThumbnailView extends ImageView {

    19     private static final String LOGTAG = "GeckoThumbnailView";

    20     final private Matrix mMatrix;

    21     private int mWidthSpec = -1;

    22     private int mHeightSpec = -1;

    23     private boolean mLayoutChanged;

    25     public ThumbnailView(Context context, AttributeSet attrs) {

    26         super(context, attrs);

    27         mMatrix = new Matrix();

    28         mLayoutChanged = true;

    29     }

    31     @Override

    32     public void onDraw(Canvas canvas) {

    33         Drawable d = getDrawable();

    34         if (mLayoutChanged) {

    35             int w1 = d.getIntrinsicWidth();

    36             int h1 = d.getIntrinsicHeight();

    37             int w2 = getWidth();

    38             int h2 = getHeight();

    40             float scale = (w2/h2 < w1/h1) ? (float)h2/h1 : (float)w2/w1;

    41             mMatrix.setScale(scale, scale);

    42         }

    44         int saveCount = canvas.save();

    45         canvas.concat(mMatrix);

    46         d.draw(canvas);

    47         canvas.restoreToCount(saveCount);

    48     }

    50     @Override

    51     protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {

    52         // OnLayout.changed isn't a reliable measure of whether or not the size of this view has changed

    53         // neither is onSizeChanged called often enough. Instead, we track changes in size ourselves, and

    54         // only invalidate this matrix if we have a new width/height spec

    55         if (widthMeasureSpec != mWidthSpec || heightMeasureSpec != mHeightSpec) {

    56             mWidthSpec = widthMeasureSpec;

    57             mHeightSpec = heightMeasureSpec;

    58             mLayoutChanged = true;

    59         }

    60         super.onMeasure(widthMeasureSpec, heightMeasureSpec);

    61     }

    62 }

The Tor Browser / file revision