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
|
// Copyright (c) 2009 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/tab_contents/web_drag_dest_gtk.h"
#include "app/gtk_dnd_util.h"
#include "base/string_util.h"
#include "chrome/browser/tab_contents/tab_contents.h"
#include "chrome/common/gtk_util.h"
using WebKit::WebDragOperation;
using WebKit::WebDragOperationCopy;
using WebKit::WebDragOperationNone;
WebDragDestGtk::WebDragDestGtk(TabContents* tab_contents, GtkWidget* widget)
: tab_contents_(tab_contents),
widget_(widget),
context_(NULL),
method_factory_(this) {
gtk_drag_dest_set(widget, static_cast<GtkDestDefaults>(0),
NULL, 0, GDK_ACTION_COPY);
g_signal_connect(widget, "drag-motion",
G_CALLBACK(OnDragMotionThunk), this);
g_signal_connect(widget, "drag-leave",
G_CALLBACK(OnDragLeaveThunk), this);
g_signal_connect(widget, "drag-drop",
G_CALLBACK(OnDragDropThunk), this);
g_signal_connect(widget, "drag-data-received",
G_CALLBACK(OnDragDataReceivedThunk), this);
destroy_handler_ = g_signal_connect(
widget, "destroy", G_CALLBACK(gtk_widget_destroyed), &widget_);
}
WebDragDestGtk::~WebDragDestGtk() {
if (widget_) {
gtk_drag_dest_unset(widget_);
g_signal_handler_disconnect(widget_, destroy_handler_);
}
}
void WebDragDestGtk::UpdateDragStatus(WebDragOperation operation) {
if (context_) {
// TODO(estade): we might want to support other actions besides copy,
// but that would increase the cost of getting our drag success guess
// wrong.
is_drop_target_ = operation != WebDragOperationNone;
// TODO(snej): Pass appropriate GDK action instead of hardcoding COPY
gdk_drag_status(context_, is_drop_target_ ? GDK_ACTION_COPY :
static_cast<GdkDragAction>(0),
drag_over_time_);
}
}
void WebDragDestGtk::DragLeave() {
tab_contents_->render_view_host()->DragTargetDragLeave();
}
gboolean WebDragDestGtk::OnDragMotion(GdkDragContext* context, gint x, gint y,
guint time) {
if (context_ != context) {
context_ = context;
drop_data_.reset(new WebDropData);
is_drop_target_ = false;
static int supported_targets[] = {
GtkDndUtil::TEXT_PLAIN,
GtkDndUtil::TEXT_URI_LIST,
GtkDndUtil::TEXT_HTML,
// TODO(estade): support image drags?
};
data_requests_ = arraysize(supported_targets);
for (size_t i = 0; i < arraysize(supported_targets); ++i) {
gtk_drag_get_data(widget_, context,
GtkDndUtil::GetAtomForTarget(supported_targets[i]),
time);
}
} else if (data_requests_ == 0) {
tab_contents_->render_view_host()->
DragTargetDragOver(gtk_util::ClientPoint(widget_),
gtk_util::ScreenPoint(widget_),
WebDragOperationCopy);
// TODO(snej): Pass appropriate DragOperation instead of hardcoding
drag_over_time_ = time;
}
// Pretend we are a drag destination because we don't want to wait for
// the renderer to tell us if we really are or not.
return TRUE;
}
void WebDragDestGtk::OnDragDataReceived(
GdkDragContext* context, gint x, gint y, GtkSelectionData* data,
guint info, guint time) {
// We might get the data from an old get_data() request that we no longer
// care about.
if (context != context_)
return;
data_requests_--;
// Decode the data.
if (data->data) {
// If the source can't provide us with valid data for a requested target,
// data->data will be NULL.
if (data->target ==
GtkDndUtil::GetAtomForTarget(GtkDndUtil::TEXT_PLAIN)) {
guchar* text = gtk_selection_data_get_text(data);
if (text) {
drop_data_->plain_text =
UTF8ToUTF16(std::string(reinterpret_cast<char*>(text),
data->length));
g_free(text);
}
} else if (data->target ==
GtkDndUtil::GetAtomForTarget(GtkDndUtil::TEXT_URI_LIST)) {
gchar** uris = gtk_selection_data_get_uris(data);
if (uris) {
for (gchar** uri_iter = uris; *uri_iter; uri_iter++) {
// TODO(estade): Can the filenames have a non-UTF8 encoding?
drop_data_->filenames.push_back(UTF8ToUTF16(*uri_iter));
}
// Also, write the first URI as the URL.
if (uris[0])
drop_data_->url = GURL(uris[0]);
g_strfreev(uris);
}
} else if (data->target ==
GtkDndUtil::GetAtomForTarget(GtkDndUtil::TEXT_HTML)) {
// TODO(estade): Can the html have a non-UTF8 encoding?
drop_data_->text_html =
UTF8ToUTF16(std::string(reinterpret_cast<char*>(data->data),
data->length));
// We leave the base URL empty.
}
}
if (data_requests_ == 0) {
// Tell the renderer about the drag.
// |x| and |y| are seemingly arbitrary at this point.
tab_contents_->render_view_host()->
DragTargetDragEnter(*drop_data_.get(),
gtk_util::ClientPoint(widget_),
gtk_util::ScreenPoint(widget_),
WebDragOperationCopy);
// TODO(snej): Pass appropriate DragOperation instead of hardcoding
drag_over_time_ = time;
}
}
// The drag has left our widget; forward this information to the renderer.
void WebDragDestGtk::OnDragLeave(GdkDragContext* context, guint time) {
// Set |context_| to NULL to make sure we will recognize the next DragMotion
// as an enter.
context_ = NULL;
drop_data_.reset();
// When GTK sends us a drag-drop signal, it is shortly (and synchronously)
// preceded by a drag-leave. The renderer doesn't like getting the signals
// in this order so delay telling it about the drag-leave till we are sure
// we are not getting a drop as well.
MessageLoop::current()->PostTask(FROM_HERE,
method_factory_.NewRunnableMethod(&WebDragDestGtk::DragLeave));
}
// Called by GTK when the user releases the mouse, executing a drop.
gboolean WebDragDestGtk::OnDragDrop(GdkDragContext* context, gint x, gint y,
guint time) {
// Cancel that drag leave!
method_factory_.RevokeAll();
tab_contents_->render_view_host()->
DragTargetDrop(gtk_util::ClientPoint(widget_),
gtk_util::ScreenPoint(widget_));
// The second parameter is just an educated guess, but at least we will
// get the drag-end animation right sometimes.
gtk_drag_finish(context, is_drop_target_, FALSE, time);
return TRUE;
}
|
