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
122
123
124
|
//
// LabelBackendGtk2.cs
//
// Author:
// Vsevolod Kukol <v.kukol@rubologic.de>
//
// Copyright (c) 2014 Vsevolod Kukol
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
using System;
using Xwt.Drawing;
using Xwt.CairoBackend;
namespace Xwt.GtkBackend
{
public partial class LabelBackend
{
Color? bgColor;
int wrapHeight, wrapWidth;
public override Xwt.Drawing.Color BackgroundColor {
get {
return bgColor.HasValue ? bgColor.Value : base.BackgroundColor;
}
set {
if (!bgColor.HasValue)
Label.ExposeEvent += HandleLabelExposeEvent;
bgColor = value;
Label.QueueDraw ();
}
}
[GLib.ConnectBefore]
void HandleLabelExposeEvent (object o, Gtk.ExposeEventArgs args)
{
using (var ctx = Gdk.CairoHelper.Create (Label.GdkWindow)) {
ctx.Rectangle (Label.Allocation.X, Label.Allocation.Y, Label.Allocation.Width, Label.Allocation.Height);
ctx.SetSourceColor (bgColor.Value.ToCairoColor ());
ctx.Fill ();
}
}
void HandleLabelDynamicSizeAllocate (object o, Gtk.SizeAllocatedArgs args)
{
int unused, oldHeight = wrapHeight;
Label.Layout.Width = Pango.Units.FromPixels (args.Allocation.Width);
Label.Layout.GetPixelSize (out unused, out wrapHeight);
if (wrapWidth != args.Allocation.Width || oldHeight != wrapHeight) {
wrapWidth = args.Allocation.Width;
Label.QueueResize ();
}
// GTK renders the text using the calculated pixel width, not the allocated width.
// If the calculated width is smaller and text is not left aligned, then a gap is
// shown at the right of the label. We then have the adjust the allocation.
if (Label.Justify == Gtk.Justification.Right) {
var w = wrapWidth - unused;
if (w != Label.Xpad)
Label.Xpad = w;
} else if (Label.Justify == Gtk.Justification.Center) {
var w = (wrapWidth - unused) / 2;
if (w != Label.Xpad)
Label.Xpad = w;
}
}
void HandleLabelDynamicSizeRequest (object o, Gtk.SizeRequestedArgs args)
{
if (wrapHeight > 0) {
var req = args.Requisition;
req.Width = Label.WidthRequest != -1 ? Label.WidthRequest : 0;
req.Height = wrapHeight;
args.Requisition = req;
}
}
void SetAlignmentGtk ()
{
switch (TextAlignment) {
case Alignment.Start:
Label.Xalign = 0f;
break;
case Alignment.End:
Label.Xalign = Label.LineWrap ? 0 : 1;
break;
case Alignment.Center:
Label.Xalign = Label.LineWrap ? 0 : 0.5f;
break;
}
}
void ToggleSizeCheckEventsForWrap (WrapMode wrapMode)
{
if (wrapMode == WrapMode.None){
if (Label.LineWrap) {
Label.SizeAllocated -= HandleLabelDynamicSizeAllocate;
Label.SizeRequested -= HandleLabelDynamicSizeRequest;
}
} else {
if (!Label.LineWrap) {
Label.SizeAllocated += HandleLabelDynamicSizeAllocate;
Label.SizeRequested += HandleLabelDynamicSizeRequest;
}
}
}
}
}
|