← Back to branch summary

~ubuntu-branches/ubuntu/trusty/monodevelop/trusty-proposed

« back to all changes in this revision

Viewing changes to external/xwt/Xwt.WPF/Xwt.WPFBackend/ScrollAdjustmentBackend.cs

  • Committer: Package Import Robot
  • Author(s): Jo Shields
  • Date: 2013-05-12 09:46:03 UTC
  • mto: This revision was merged to the branch mainline in revision 29.
  • Revision ID: package-import@ubuntu.com-20130512094603-mad323bzcxvmcam0
Tags: upstream-4.0.5+dfsg
Import upstream version 4.0.5+dfsg

Show diffs side-by-side

added added

removed removed

Lines of Context:
external/xwt/Xwt.WPF/Xwt.WPFBackend/ScrollAdjustmentBackend.cs
 
1
//
 
2
// ScrollViewBackend.cs
 
3
//
 
4
// Author:
 
5
//         Eric Maupin <ermau@xamarin.com>
 
6
//
 
7
// Copyright (c) 2012 Xamarin, Inc.
 
8
//
 
9
// Permission is hereby granted, free of charge, to any person obtaining a copy
 
10
// of this software and associated documentation files (the "Software"), to deal
 
11
// in the Software without restriction, including without limitation the rights
 
12
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 
13
// copies of the Software, and to permit persons to whom the Software is
 
14
// furnished to do so, subject to the following conditions:
 
15
//
 
16
// The above copyright notice and this permission notice shall be included in
 
17
// all copies or substantial portions of the Software.
 
18
//
 
19
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 
20
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 
21
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 
22
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 
23
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 
24
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 
25
// THE SOFTWARE.
 
26
 
 
27
using System;
 
28
using Xwt.Backends;
 
29
using System.Windows.Controls;
 
30
 
 
31
namespace Xwt.WPFBackend
 
32
{
 
33
        internal class ScrollAdjustmentBackend
 
34
                : Backend, IScrollAdjustmentBackend
 
35
        {
 
36
                double scrollValue;
 
37
                double lowerValue;
 
38
                double upperValue;
 
39
                double pageIncrement;
 
40
                double stepIncrement;
 
41
                double pageSize;
 
42
 
 
43
                public CustomScrollViewPort TargetViewport { get; set; }
 
44
 
 
45
                public void Initialize (IScrollAdjustmentEventSink eventSink)
 
46
                {
 
47
                        EventSink = eventSink;
 
48
                }
 
49
 
 
50
                public void SetOffset (double offset)
 
51
                {
 
52
                        // The offset is relative to 0, it has to be converted to the lower/upper value range
 
53
                        scrollValue = LowerValue + offset;
 
54
                        Xwt.Engine.Toolkit.Invoke (EventSink.OnValueChanged);
 
55
                }
 
56
 
 
57
                public double Value
 
58
                {
 
59
                        get { return scrollValue; }
 
60
                        set {
 
61
                                // Provide the value to the viewport, which will update
 
62
                                // the ScrollView. The viewport expects an offset starting at 0.
 
63
                                TargetViewport.SetOffset (this, value - LowerValue);
 
64
                        }
 
65
                }
 
66
 
 
67
                public double LowerValue
 
68
                {
 
69
                        get { return lowerValue; }
 
70
                        set { lowerValue = value; InvalidateExtent (); }
 
71
                }
 
72
 
 
73
                public double UpperValue
 
74
                {
 
75
                        get { return upperValue; }
 
76
                        set { upperValue = value; InvalidateExtent (); }
 
77
                }
 
78
 
 
79
                public double PageIncrement
 
80
                {
 
81
                        get { return pageIncrement; }
 
82
                        set { pageIncrement = value; InvalidateScrollInfo (); }
 
83
                }
 
84
 
 
85
                public double StepIncrement
 
86
                {
 
87
                        get { return stepIncrement; }
 
88
                        set { stepIncrement = value; InvalidateScrollInfo (); }
 
89
                }
 
90
 
 
91
                public double PageSize
 
92
                {
 
93
                        get { return pageSize; }
 
94
                        set { pageSize = value; InvalidateExtent (); }
 
95
                }
 
96
 
 
97
                void InvalidateScrollInfo ()
 
98
                {
 
99
                        if (TargetViewport != null && TargetViewport.ScrollOwner != null)
 
100
                                TargetViewport.ScrollOwner.InvalidateScrollInfo ();
 
101
                }
 
102
 
 
103
                void InvalidateExtent ()
 
104
                {
 
105
                        if (TargetViewport != null)
 
106
                                TargetViewport.UpdateCustomExtent ();
 
107
                }
 
108
 
 
109
                internal IScrollAdjustmentEventSink EventSink
 
110
                {
 
111
                        get;
 
112
                        private set;
 
113
                }
 
114
        }
 
115
}
 
 
b'\\ No newline at end of file'