blob: c0c097747c695a4166079611dd80b7d06334f551 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
|
/* -*- Mode: Java; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*/
package org.libreoffice;
import android.graphics.Bitmap;
import android.graphics.Color;
import android.graphics.drawable.ColorDrawable;
import android.graphics.drawable.Drawable;
import android.widget.ImageView;
import java.lang.ref.WeakReference;
/**
* Create thumbnails for the parts of the document.
*/
public class ThumbnailCreator {
private static final String LOG_TAG = ThumbnailCreator.class.getSimpleName();
private static final int THUMBNAIL_SIZE = 256;
private static boolean needsThumbnailCreation(int partNumber, ImageView imageView) {
ThumbnailCreationTask thumbnailCreationTask = currentThumbnailCreationTask(imageView);
if (thumbnailCreationTask == null) {
return true;
}
if (thumbnailCreationTask.partNumber != partNumber) {
thumbnailCreationTask.cancel();
return true;
} else {
return false;
}
}
private static ThumbnailCreationTask currentThumbnailCreationTask(ImageView imageView) {
if (imageView == null) {
return null;
}
Drawable drawable = imageView.getDrawable();
if (drawable instanceof ThumbnailDrawable) {
return ((ThumbnailDrawable) drawable).thumbnailCreationTask.get();
} else {
return null;
}
}
public void createThumbnail(int partNumber, ImageView imageView) {
if (needsThumbnailCreation(partNumber, imageView)) {
ThumbnailCreationTask task = new ThumbnailCreationTask(imageView, partNumber);
ThumbnailDrawable thumbnailDrawable = new ThumbnailDrawable(task);
imageView.setImageDrawable(thumbnailDrawable);
imageView.setMinimumHeight(THUMBNAIL_SIZE);
LOKitShell.sendThumbnailEvent(task);
}
}
static class ThumbnailDrawable extends ColorDrawable {
public final WeakReference<ThumbnailCreationTask> thumbnailCreationTask;
public ThumbnailDrawable(ThumbnailCreationTask thumbnailCreationTask) {
super(Color.WHITE);
this.thumbnailCreationTask = new WeakReference<ThumbnailCreationTask>(thumbnailCreationTask);
}
}
class ThumbnailCreationTask{
private final WeakReference<ImageView> imageViewReference;
private final int partNumber;
private boolean cancelled = false;
public ThumbnailCreationTask(ImageView imageView, int partNumber) {
imageViewReference = new WeakReference<ImageView>(imageView);
this.partNumber = partNumber;
}
public void cancel() {
cancelled = true;
}
public Bitmap getThumbnail(TileProvider tileProvider) {
int currentPart = tileProvider.getCurrentPartNumber();
tileProvider.changePart(partNumber);
final Bitmap bitmap = tileProvider.thumbnail(THUMBNAIL_SIZE);
tileProvider.changePart(currentPart);
return bitmap;
}
private void changeBitmap(Bitmap bitmap) {
if (cancelled) {
bitmap = null;
}
if (imageViewReference == null) {
return;
}
ImageView imageView = imageViewReference.get();
ThumbnailCreationTask thumbnailCreationTask = currentThumbnailCreationTask(imageView);
if (this == thumbnailCreationTask) {
imageView.setImageBitmap(bitmap);
}
}
public void applyBitmap(final Bitmap bitmap) {
// run on UI thread
LibreOfficeApplication.getMainHandler().post(new Runnable() {
@Override
public void run() {
changeBitmap(bitmap);
}
});
}
}
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
|
