blob: 027523f68bf3773ad6efa0cb45b847a0e9c67a5e (
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
|
/*
* Copyright (C) 2014 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
*
* 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.deskclock;
import android.content.Context;
import android.support.v4.view.ViewPager;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
public class VerticalViewPager extends ViewPager {
public VerticalViewPager(Context context) {
this(context, null);
}
public VerticalViewPager(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
/**
* @return {@code false} since a vertical view pager can never be scrolled horizontally
*/
@Override
public boolean canScrollHorizontally(int direction) {
return false;
}
/**
* @return {@code true} iff a normal view pager would support horizontal scrolling at this time
*/
@Override
public boolean canScrollVertically(int direction) {
return super.canScrollHorizontally(direction);
}
private void init() {
// Make page transit vertical
setPageTransformer(true, new VerticalPageTransformer());
// Get rid of the overscroll drawing that happens on the left and right (the ripple)
setOverScrollMode(View.OVER_SCROLL_NEVER);
}
@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
final boolean toIntercept = super.onInterceptTouchEvent(flipXY(ev));
// Return MotionEvent to normal
flipXY(ev);
return toIntercept;
}
@Override
public boolean onTouchEvent(MotionEvent ev) {
final boolean toHandle = super.onTouchEvent(flipXY(ev));
// Return MotionEvent to normal
flipXY(ev);
return toHandle;
}
private MotionEvent flipXY(MotionEvent ev) {
final float width = getWidth();
final float height = getHeight();
final float x = (ev.getY() / height) * width;
final float y = (ev.getX() / width) * height;
ev.setLocation(x, y);
return ev;
}
private static final class VerticalPageTransformer implements ViewPager.PageTransformer {
@Override
public void transformPage(View view, float position) {
final int pageWidth = view.getWidth();
final int pageHeight = view.getHeight();
if (position < -1) {
// This page is way off-screen to the left.
view.setAlpha(0);
} else if (position <= 1) {
view.setAlpha(1);
// Counteract the default slide transition
view.setTranslationX(pageWidth * -position);
// set Y position to swipe in from top
float yPosition = position * pageHeight;
view.setTranslationY(yPosition);
} else {
// This page is way off-screen to the right.
view.setAlpha(0);
}
}
}
}
|
