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
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
|
//
// PopoverBackend.cs
//
// Author:
// Jérémie Laval <jeremie.laval@xamarin.com>
//
// Copyright (c) 2012 Xamarin, Inc.
//
// 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.Backends;
using Gtk;
using Cairo;
namespace Xwt.GtkBackend
{
public class PopoverBackend : IPopoverBackend
{
class PopoverWindow : Gtk.Window
{
const int arrowPadding = 10;
const int radius = 6;
bool supportAlpha;
Xwt.Popover.Position arrowPosition;
Gtk.Alignment alignment;
public PopoverWindow (Gtk.Widget child, Xwt.Popover.Position orientation) : base (WindowType.Toplevel)
{
this.AppPaintable = true;
this.Decorated = false;
this.SkipPagerHint = true;
this.SkipTaskbarHint = true;
this.TypeHint = Gdk.WindowTypeHint.PopupMenu;
//this.TransientFor = (Gtk.Window)child.Toplevel;
this.AddEvents ((int)Gdk.EventMask.FocusChangeMask);
//this.DefaultHeight = this.DefaultWidth = 400;
this.arrowPosition = orientation;
this.alignment = new Gtk.Alignment (0, 0, 1, 1);
this.Add (alignment);
this.alignment.Add (child);
this.FocusOutEvent += HandleFocusOutEvent;
OnScreenChanged (null);
}
public Xwt.Popover.Position ArrowPosition {
get {
return arrowPosition;
}
}
public void ReleaseInnerWidget ()
{
alignment.Remove (alignment.Child);
}
void HandleFocusOutEvent (object o, FocusOutEventArgs args)
{
this.HideAll ();
}
public void SetPadding (WidgetSpacing spacing)
{
alignment.LeftPadding = radius + (uint) spacing.Left;
alignment.RightPadding = radius + (uint) spacing.Right;
if (arrowPosition == Xwt.Popover.Position.Top) {
alignment.TopPadding = radius + arrowPadding + (uint) spacing.Top;
alignment.BottomPadding = radius + (uint) spacing.Bottom;
} else {
alignment.BottomPadding = radius + arrowPadding + (uint) spacing.Bottom;
alignment.TopPadding = radius + (uint) spacing.Top;
}
}
protected override void OnScreenChanged (Gdk.Screen previous_screen)
{
// To check if the display supports alpha channels, get the colormap
var colormap = this.Screen.RgbaColormap;
if (colormap == null) {
colormap = this.Screen.RgbColormap;
supportAlpha = false;
} else {
supportAlpha = true;
}
this.Colormap = colormap;
base.OnScreenChanged (previous_screen);
}
protected override bool OnExposeEvent (Gdk.EventExpose evnt)
{
int w, h;
this.GdkWindow.GetSize (out w, out h);
var bounds = new Xwt.Rectangle (0.5, 0.5, w - 1, h - 1);
var backgroundColor = Xwt.Drawing.Color.FromBytes (230, 230, 230, 230);
var black = Xwt.Drawing.Color.FromBytes (60, 60, 60);
using (Context ctx = Gdk.CairoHelper.Create (this.GdkWindow)) {
// We clear the surface with a transparent color if possible
if (supportAlpha)
ctx.Color = new Color (1.0, 1.0, 1.0, 0.0);
else
ctx.Color = new Color (1.0, 1.0, 1.0);
ctx.Operator = Operator.Source;
ctx.Paint ();
var calibratedRect = RecalibrateChildRectangle (bounds);
// Fill it with one round rectangle
RoundRectangle (ctx, calibratedRect, radius);
ctx.LineWidth = 1;
ctx.Color = new Color (black.Red, black.Green, black.Blue, black.Alpha);
ctx.StrokePreserve ();
ctx.Color = new Color (backgroundColor.Red, backgroundColor.Green, backgroundColor.Blue, backgroundColor.Alpha);
ctx.Fill ();
// Triangle
// We first begin by positionning ourselves at the top-center or bottom center of the previous rectangle
var arrowX = bounds.Center.X;
var arrowY = arrowPosition == Xwt.Popover.Position.Top ? calibratedRect.Top + ctx.LineWidth : calibratedRect.Bottom - ctx.LineWidth;
ctx.NewPath ();
ctx.MoveTo (arrowX, arrowY);
// We draw the rectangle path
DrawTriangle (ctx);
// We use it
ctx.Color = new Color (black.Red, black.Green, black.Blue, black.Alpha);
ctx.StrokePreserve ();
ctx.ClosePath ();
ctx.Color = new Color (backgroundColor.Red, backgroundColor.Green, backgroundColor.Blue, backgroundColor.Alpha);
ctx.Fill ();
}
base.OnExposeEvent (evnt);
return false;
}
void DrawTriangle (Context ctx)
{
var triangleSide = 2 * arrowPadding / Math.Sqrt (3);
var halfSide = triangleSide / 2;
var verticalModifier = arrowPosition == Xwt.Popover.Position.Top ? -1 : 1;
// Move to the left
ctx.RelMoveTo (-halfSide, 0);
ctx.RelLineTo (halfSide, verticalModifier * arrowPadding);
ctx.RelLineTo (halfSide, verticalModifier * -arrowPadding);
}
void RoundRectangle (Context ctx, Rectangle rect, double radius)
{
double degrees = Math.PI / 180;
var x = rect.X;
var y = rect.Y;
var height = rect.Height;
var width = rect.Width;
ctx.NewSubPath ();
ctx.Arc (x + width - radius, y + radius, radius, -90 * degrees, 0 * degrees);
ctx.Arc (x + width - radius, y + height - radius, radius, 0 * degrees, 90 * degrees);
ctx.Arc (x + radius, y + height - radius, radius, 90 * degrees, 180 * degrees);
ctx.Arc (x + radius, y + radius, radius, 180 * degrees, 270 * degrees);
ctx.ClosePath ();
}
Xwt.Rectangle RecalibrateChildRectangle (Xwt.Rectangle bounds)
{
switch (arrowPosition) {
case Xwt.Popover.Position.Top:
return new Rectangle (bounds.X, bounds.Y + arrowPadding, bounds.Width, bounds.Height - arrowPadding);
case Xwt.Popover.Position.Bottom:
return new Rectangle (bounds.X, bounds.Y, bounds.Width, bounds.Height - arrowPadding);
}
return bounds;
}
}
PopoverWindow popover;
IPopoverEventSink sink;
Popover frontend;
public void Initialize (IPopoverEventSink sink)
{
this.sink = sink;
}
public void InitializeBackend (object frontend)
{
this.frontend = (Popover) frontend;
}
public void EnableEvent (object eventId)
{
}
public void DisableEvent (object eventId)
{
}
public void Show (Xwt.Popover.Position orientation, Xwt.Widget reference, Xwt.Rectangle positionRect, Widget child)
{
var parent = reference.ParentWindow;
popover = new PopoverWindow ((Gtk.Widget)((WidgetBackend)Xwt.Engine.WidgetRegistry.GetBackend (child)).NativeWidget, orientation);
popover.SetPadding (frontend.Padding);
popover.TransientFor = ((WindowFrameBackend)Xwt.Engine.WidgetRegistry.GetBackend (parent)).Window;
popover.DestroyWithParent = true;
popover.Hidden += (o, args) => {
popover.ReleaseInnerWidget ();
sink.OnClosed ();
popover.Destroy ();
};
var position = new Point (reference.ScreenBounds.Center.X, popover.ArrowPosition == Popover.Position.Top ? reference.ScreenBounds.Bottom : reference.ScreenBounds.Top);
popover.ShowAll ();
popover.GrabFocus ();
int w, h;
popover.GetSize (out w, out h);
popover.Move ((int)position.X - w / 2, (int)position.Y);
popover.SizeAllocated += (o, args) => { popover.Move ((int)position.X - args.Allocation.Width / 2, (int)position.Y); popover.GrabFocus (); };
}
public void Hide ()
{
popover.Hide ();
}
public void Dispose ()
{
}
}
}
|