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// 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/gtk/tab_contents_drag_source.h"
#include "app/gtk_dnd_util.h"
#include "base/mime_util.h"
#include "base/string_util.h"
#include "chrome/browser/renderer_host/render_view_host_delegate.h"
#include "chrome/browser/tab_contents/tab_contents.h"
#include "chrome/browser/tab_contents/tab_contents_view.h"
#include "chrome/common/gtk_util.h"
#include "webkit/glue/webdropdata.h"
using WebKit::WebDragOperation;
using WebKit::WebDragOperationNone;
TabContentsDragSource::TabContentsDragSource(
TabContentsView* tab_contents_view)
: tab_contents_view_(tab_contents_view),
drag_failed_(false),
drag_widget_(NULL) {
drag_widget_ = gtk_invisible_new();
g_signal_connect(drag_widget_, "drag-failed",
G_CALLBACK(OnDragFailedThunk), this);
g_signal_connect(drag_widget_, "drag-end", G_CALLBACK(OnDragEndThunk), this);
g_signal_connect(drag_widget_, "drag-data-get",
G_CALLBACK(OnDragDataGetThunk), this);
g_object_ref_sink(drag_widget_);
}
TabContentsDragSource::~TabContentsDragSource() {
g_signal_handlers_disconnect_by_func(drag_widget_,
reinterpret_cast<gpointer>(OnDragFailedThunk), this);
g_signal_handlers_disconnect_by_func(drag_widget_,
reinterpret_cast<gpointer>(OnDragEndThunk), this);
g_signal_handlers_disconnect_by_func(drag_widget_,
reinterpret_cast<gpointer>(OnDragDataGetThunk), this);
// Break the current drag, if any.
if (drop_data_.get()) {
gtk_grab_add(drag_widget_);
gtk_grab_remove(drag_widget_);
MessageLoopForUI::current()->RemoveObserver(this);
drop_data_.reset();
}
gtk_widget_destroy(drag_widget_);
g_object_unref(drag_widget_);
drag_widget_ = NULL;
}
TabContents* TabContentsDragSource::tab_contents() const {
return tab_contents_view_->tab_contents();
}
void TabContentsDragSource::StartDragging(const WebDropData& drop_data,
GdkEventButton* last_mouse_down) {
int targets_mask = 0;
if (!drop_data.plain_text.empty())
targets_mask |= GtkDndUtil::TEXT_PLAIN;
if (drop_data.url.is_valid()) {
targets_mask |= GtkDndUtil::TEXT_URI_LIST;
targets_mask |= GtkDndUtil::CHROME_NAMED_URL;
}
if (!drop_data.text_html.empty())
targets_mask |= GtkDndUtil::TEXT_HTML;
if (!drop_data.file_contents.empty())
targets_mask |= GtkDndUtil::CHROME_WEBDROP_FILE_CONTENTS;
if (targets_mask == 0) {
NOTIMPLEMENTED();
if (tab_contents()->render_view_host())
tab_contents()->render_view_host()->DragSourceSystemDragEnded();
}
drop_data_.reset(new WebDropData(drop_data));
GtkTargetList* list = GtkDndUtil::GetTargetListFromCodeMask(targets_mask);
if (targets_mask & GtkDndUtil::CHROME_WEBDROP_FILE_CONTENTS) {
drag_file_mime_type_ = gdk_atom_intern(
mime_util::GetDataMimeType(drop_data.file_contents).c_str(), FALSE);
gtk_target_list_add(list, drag_file_mime_type_,
0, GtkDndUtil::CHROME_WEBDROP_FILE_CONTENTS);
}
drag_failed_ = false;
// If we don't pass an event, GDK won't know what event time to start grabbing
// mouse events. Technically it's the mouse motion event and not the mouse
// down event that causes the drag, but there's no reliable way to know
// *which* motion event initiated the drag, so this will have to do.
// TODO(estade): This can sometimes be very far off, e.g. if the user clicks
// and holds and doesn't start dragging for a long time. I doubt it matters
// much, but we should probably look into the possibility of getting the
// initiating event from webkit.
gtk_drag_begin(drag_widget_, list, GDK_ACTION_COPY,
1, // Drags are always initiated by the left button.
reinterpret_cast<GdkEvent*>(last_mouse_down));
MessageLoopForUI::current()->AddObserver(this);
// The drag adds a ref; let it own the list.
gtk_target_list_unref(list);
}
void TabContentsDragSource::WillProcessEvent(GdkEvent* event) {
// No-op.
}
void TabContentsDragSource::DidProcessEvent(GdkEvent* event) {
if (event->type != GDK_MOTION_NOTIFY)
return;
GdkEventMotion* event_motion = reinterpret_cast<GdkEventMotion*>(event);
gfx::Point client = gtk_util::ClientPoint(GetContentNativeView());
if (tab_contents()->render_view_host()) {
tab_contents()->render_view_host()->DragSourceMovedTo(
client.x(), client.y(),
static_cast<int>(event_motion->x_root),
static_cast<int>(event_motion->y_root));
}
}
void TabContentsDragSource::OnDragDataGet(
GdkDragContext* context, GtkSelectionData* selection_data,
guint target_type, guint time) {
const int bits_per_byte = 8;
switch (target_type) {
case GtkDndUtil::TEXT_PLAIN: {
std::string utf8_text = UTF16ToUTF8(drop_data_->plain_text);
gtk_selection_data_set_text(selection_data, utf8_text.c_str(),
utf8_text.length());
break;
}
case GtkDndUtil::TEXT_HTML: {
// TODO(estade): change relative links to be absolute using
// |html_base_url|.
std::string utf8_text = UTF16ToUTF8(drop_data_->text_html);
gtk_selection_data_set(selection_data,
GtkDndUtil::GetAtomForTarget(
GtkDndUtil::TEXT_HTML),
bits_per_byte,
reinterpret_cast<const guchar*>(utf8_text.c_str()),
utf8_text.length());
break;
}
case GtkDndUtil::TEXT_URI_LIST:
case GtkDndUtil::CHROME_NAMED_URL: {
GtkDndUtil::WriteURLWithName(selection_data, drop_data_->url,
drop_data_->url_title, target_type);
break;
}
case GtkDndUtil::CHROME_WEBDROP_FILE_CONTENTS: {
gtk_selection_data_set(
selection_data,
drag_file_mime_type_, bits_per_byte,
reinterpret_cast<const guchar*>(drop_data_->file_contents.data()),
drop_data_->file_contents.length());
break;
}
default:
NOTREACHED();
}
}
gboolean TabContentsDragSource::OnDragFailed() {
drag_failed_ = true;
gfx::Point root = gtk_util::ScreenPoint(GetContentNativeView());
gfx::Point client = gtk_util::ClientPoint(GetContentNativeView());
if (tab_contents()->render_view_host()) {
tab_contents()->render_view_host()->DragSourceEndedAt(
client.x(), client.y(), root.x(), root.y(),
WebDragOperationNone);
}
// Let the native failure animation run.
return FALSE;
}
void TabContentsDragSource::OnDragEnd(WebDragOperation operation) {
MessageLoopForUI::current()->RemoveObserver(this);
if (!drag_failed_) {
gfx::Point root = gtk_util::ScreenPoint(GetContentNativeView());
gfx::Point client = gtk_util::ClientPoint(GetContentNativeView());
if (tab_contents()->render_view_host()) {
tab_contents()->render_view_host()->DragSourceEndedAt(
client.x(), client.y(), root.x(), root.y(), operation);
}
}
if (tab_contents()->render_view_host())
tab_contents()->render_view_host()->DragSourceSystemDragEnded();
drop_data_.reset();
}
gfx::NativeView TabContentsDragSource::GetContentNativeView() const {
return tab_contents_view_->GetContentNativeView();
}
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