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
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
|
#
# Reimplementation of gtk.Layout in python
# Example on how to implement a scrollable container in python
#
# Johan Dahlin <johan@gnome.org>, 2006
#
# Requires PyGTK 2.8.0 or later
import gobject
import gtk
from gtk import gdk
class Child:
widget = None
x = 0
y = 0
def set_adjustment_upper(adj, upper, always_emit):
changed = False
value_changed = False
min = max(0.0, upper - adj.page_size)
if upper != adj.upper:
adj.upper = upper
changed = True
if adj.value > min:
adj.value = min
value_changed = True
if changed or always_emit:
adj.changed()
if value_changed:
adj.value_changed()
def new_adj():
return gtk.Adjustment(0.0, 0.0, 0.0,
0.0, 0.0, 0.0)
class Layout(gtk.Container):
__gsignals__ = dict(set_scroll_adjustments=
(gobject.SIGNAL_RUN_LAST, None,
(gtk.Adjustment, gtk.Adjustment)))
def __init__(self):
self._children = []
self._width = 100
self._height = 100
self._hadj = None
self._vadj = None
self._bin_window = None
self._hadj_changed_id = -1
self._vadj_changed_id = -1
gtk.Container.__init__(self)
if not self._hadj or not self._vadj:
self._set_adjustments(self._vadj or new_adj(),
self._hadj or new_adj())
# Public API
def put(self, widget, x=0, y=0):
child = Child()
child.widget = widget
child.x = x
child.y = y
self._children.append(child)
if self.flags() & gtk.REALIZED:
widget.set_parent_window(self._bin_window)
widget.set_parent(self)
def set_size(self, width, height):
if self._width != width:
self._width = width
if self._height != height:
self._height = height
if self._hadj:
set_adjustment_upper(self._hadj, self._width, False)
if self._vadj:
set_adjustment_upper(self._vadj, self._height, False)
if self.flags() & gtk.REALIZED:
self._bin_window.resize(max(width, self.allocation.width),
max(height, self.allocation.height))
# GtkWidget
def do_realize(self):
self.set_flags(self.flags() | gtk.REALIZED)
self.window = gdk.Window(
self.get_parent_window(),
window_type=gdk.WINDOW_CHILD,
x=self.allocation.x,
y=self.allocation.y,
width=self.allocation.width,
height=self.allocation.height,
wclass=gdk.INPUT_OUTPUT,
colormap=self.get_colormap(),
event_mask=gdk.VISIBILITY_NOTIFY_MASK)
self.window.set_user_data(self)
self._bin_window = gdk.Window(
self.window,
window_type=gdk.WINDOW_CHILD,
x=int(-self._hadj.value),
y=int(-self._vadj.value),
width=max(self._width, self.allocation.width),
height=max(self._height, self.allocation.height),
colormap=self.get_colormap(),
wclass=gdk.INPUT_OUTPUT,
event_mask=(self.get_events() | gdk.EXPOSURE_MASK |
gdk.SCROLL_MASK))
self._bin_window.set_user_data(self)
self.set_style(self.style.attach(self.window))
self.style.set_background(self.window, gtk.STATE_NORMAL)
self.style.set_background(self._bin_window, gtk.STATE_NORMAL)
for child in self._children:
child.widget.set_parent_window(self._bin_window)
self.queue_resize()
def do_unrealize(self):
self._bin_window.set_user_data(None)
self._bin_window.destroy()
self._bin_window = None
gtk.Container.do_unrealize(self)
def _do_style_set(self, style):
gtk.Widget.do_style_set(self, style)
if self.flags() & gtk.REALIZED:
self.style.set_background(self._bin_window, gtk.STATE_NORMAL)
def do_expose_event(self, event):
if event.window != self._bin_window:
return False
gtk.Container.do_expose_event(self, event)
return False
def do_map(self):
self.set_flags(self.flags() | gtk.MAPPED)
for child in self._children:
flags = child.widget.flags()
if flags & gtk.VISIBLE:
if not (flags & gtk.MAPPED):
child.widget.map()
self._bin_window.show()
self.window.show()
def do_size_request(self, req):
req.width = 0
req.height = 0
for child in self._children:
child.widget.size_request()
def do_size_allocate(self, allocation):
for child in self._children:
self._allocate_child(child)
if self.flags() & gtk.REALIZED:
self.window.move_resize(*allocation)
self._bin_window.resize(max(self._width, allocation.width),
max(self._height, allocation.height))
self._hadj.page_size = allocation.width
self._hadj.page_increment = allocation.width * 0.9
self._hadj.lower = 0
set_adjustment_upper(self._hadj,
max(allocation.width, self._width), True)
self._vadj.page_size = allocation.height
self._vadj.page_increment = allocation.height * 0.9
self._vadj.lower = 0
self._vadj.upper = max(allocation.height, self._height)
set_adjustment_upper(self._vadj,
max(allocation.height, self._height), True)
def do_set_scroll_adjustments(self, hadj, vadj):
self._set_adjustments(hadj, vadj)
# GtkContainer
def do_forall(self, include_internals, callback, data):
for child in self._children:
callback(child.widget, data)
def do_add(self, widget):
self.put(widget)
def do_remove(self, widget):
child = self._get_child_from_widget(widget)
self._children.remove(child)
widget.unparent()
# Private
def _set_adjustments(self, hadj, vadj):
if not hadj and self._hadj:
hadj = new_adj()
if not vadj and self._vadj:
vadj = new_adj()
if self._hadj and self._hadj != hadj:
self._hadj.disconnect(self._hadj_changed_id)
if self._vadj and self._vadj != vadj:
self._vadj.disconnect(self._vadj_changed_id)
need_adjust = False
if self._hadj != hadj:
self._hadj = hadj
set_adjustment_upper(hadj, self._width, False)
self._hadj_changed_id = hadj.connect(
"value-changed",
self._adjustment_changed)
need_adjust = True
if self._vadj != vadj:
self._vadj = vadj
set_adjustment_upper(vadj, self._height, False)
self._vadj_changed_id = vadj.connect(
"value-changed",
self._adjustment_changed)
need_adjust = True
if need_adjust and vadj and hadj:
self._adjustment_changed()
def _adjustment_changed(self, adj=None):
if self.flags() & gtk.REALIZED:
self._bin_window.move(int(-self._hadj.value),
int(-self._vadj.value))
self._bin_window.process_updates(True)
def _get_child_from_widget(self, widget):
for child in self._children:
if child.widget == widget:
return child
else:
raise AssertionError
def _allocate_child(self, child):
allocation = gdk.Rectangle()
allocation.x = child.x
allocation.y = child.y
req = child.widget.get_child_requisition()
allocation.width = req[0]
allocation.height = req[1]
child.widget.size_allocate(allocation)
Layout.set_set_scroll_adjustments_signal('set-scroll-adjustments')
def main():
window = gtk.Window()
window.set_size_request(300, 300)
window.connect('delete-event', gtk.main_quit)
sw = gtk.ScrolledWindow()
sw.set_policy(gtk.POLICY_ALWAYS, gtk.POLICY_ALWAYS)
window.add(sw)
layout = Layout()
layout.set_size(1000, 1000)
sw.add(layout)
b = gtk.Button('foobar')
layout.put(b, 100, 100)
window.show_all()
gtk.main()
if __name__ == '__main__':
main()
|
