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cef/cef1/libcef/web_drag_source_gtk.cc

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// Copyright (c) 2013 The Chromium Embedded Framework Authors.
// Portions copyright (c) 2012 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 "libcef/web_drag_source_gtk.h"
#include <gdk/gdk.h>
#include <string>
#include "libcef/browser_impl.h"
#include "libcef/cef_context.h"
#include "libcef/drag_data_impl.h"
#include "libcef/drag_download_file.h"
#include "libcef/drag_download_util.h"
#include "libcef/web_drag_utils_gtk.h"
#include "libcef/web_drop_target_gtk.h"
#include "base/nix/mime_util_xdg.h"
#include "base/threading/thread_restrictions.h"
#include "base/utf_string_conversions.h"
#include "googleurl/src/gurl.h"
#include "net/base/file_stream.h"
#include "net/base/net_util.h"
#include "third_party/WebKit/Source/Platform/chromium/public/WebDragData.h"
#include "third_party/WebKit/Source/Platform/chromium/public/WebPoint.h"
#include "third_party/WebKit/Source/Platform/chromium/public/WebImage.h"
#include "third_party/WebKit/Source/WebKit/chromium/public/WebDocument.h"
#include "third_party/WebKit/Source/WebKit/chromium/public/WebFrame.h"
#include "third_party/WebKit/Source/WebKit/chromium/public/WebView.h"
#include "ui/base/clipboard/custom_data_helper.h"
#include "ui/base/dragdrop/os_exchange_data.h"
#include "ui/base/dragdrop/os_exchange_data_provider_gtk.h"
#include "ui/base/dragdrop/gtk_dnd_util.h"
#include "ui/base/gtk/gtk_screen_util.h"
#include "ui/base/window_open_disposition.h"
#include "ui/gfx/gtk_util.h"
#include "webkit/glue/webdropdata.h"
using WebKit::WebDragOperation;
using WebKit::WebDragOperationsMask;
using WebKit::WebDragOperationNone;
using WebKit::WebDragOperationCopy;
using WebKit::WebDragOperationLink;
using WebKit::WebDragOperationMove;
using WebKit::WebDragOperationGeneric;
using WebKit::WebPoint;
using WebKit::WebView;
WebDragSource::WebDragSource(CefBrowserImpl* browser)
: browser_(browser),
drag_pixbuf_(NULL),
drag_failed_(false),
drag_widget_(gtk_invisible_new()),
drag_context_(NULL),
drag_icon_(gtk_window_new(GTK_WINDOW_POPUP)) {
signals_.Connect(drag_widget_, "drag-failed",
G_CALLBACK(OnDragFailedThunk), this);
signals_.Connect(drag_widget_, "drag-begin",
G_CALLBACK(OnDragBeginThunk), this);
signals_.Connect(drag_widget_, "drag-end",
G_CALLBACK(OnDragEndThunk), this);
signals_.Connect(drag_widget_, "drag-data-get",
G_CALLBACK(OnDragDataGetThunk), this);
signals_.Connect(drag_icon_, "expose-event",
G_CALLBACK(OnDragIconExposeThunk), this);
}
WebDragSource::~WebDragSource() {
// 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_);
gtk_widget_destroy(drag_icon_);
}
void WebDragSource::StartDragging(const WebDropData& drop_data,
WebDragOperationsMask allowed_ops,
GdkEventButton* last_mouse_down,
const SkBitmap& image,
const gfx::Vector2d& image_offset) {
// Guard against re-starting before previous drag completed.
if (drag_context_) {
NOTREACHED();
getView()->dragSourceSystemDragEnded();
return;
}
int targets_mask = 0;
if (!drop_data.text.string().empty())
targets_mask |= ui::TEXT_PLAIN;
if (drop_data.url.is_valid()) {
targets_mask |= ui::TEXT_URI_LIST;
targets_mask |= ui::CHROME_NAMED_URL;
targets_mask |= ui::NETSCAPE_URL;
}
if (!drop_data.html.string().empty())
targets_mask |= ui::TEXT_HTML;
if (!drop_data.file_contents.empty())
targets_mask |= ui::CHROME_WEBDROP_FILE_CONTENTS;
if (!drop_data.download_metadata.empty() &&
drag_download_util::ParseDownloadMetadata(drop_data.download_metadata,
&wide_download_mime_type_,
&download_file_name_,
&download_url_)) {
targets_mask |= ui::DIRECT_SAVE_FILE;
}
if (!drop_data.custom_data.empty())
targets_mask |= ui::CUSTOM_DATA;
// NOTE: Begin a drag even if no targets present. Otherwise, things like
// draggable list elements will not work.
drop_data_.reset(new WebDropData(drop_data));
// The image we get from WebKit makes heavy use of alpha-shading. This looks
// bad on non-compositing WMs. Fall back to the default drag icon.
if (!image.isNull() && ui::IsScreenComposited())
drag_pixbuf_ = gfx::GdkPixbufFromSkBitmap(image);
image_offset_ = image_offset;
GtkTargetList* list = ui::GetTargetListFromCodeMask(targets_mask);
if (targets_mask & ui::CHROME_WEBDROP_FILE_CONTENTS) {
// Looking up the mime type can hit the disk. http://crbug.com/84896
base::ThreadRestrictions::ScopedAllowIO allow_io;
drag_file_mime_type_ = gdk_atom_intern(
base::nix::GetDataMimeType(drop_data.file_contents).c_str(), FALSE);
gtk_target_list_add(list, drag_file_mime_type_,
0, ui::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.
GdkDragAction action =
web_drag_utils_gtk::WebDragOpToGdkDragAction(allowed_ops);
drag_context_ = gtk_drag_begin(drag_widget_, list, action,
1, // Drags are always initiated by the left button.
reinterpret_cast<GdkEvent*>(last_mouse_down));
// The drag adds a ref; let it own the list.
gtk_target_list_unref(list);
// Sometimes the drag fails to start; |context| will be NULL and we won't
// get a drag-end signal.
if (!drag_context_) {
drag_failed_ = true;
drop_data_.reset();
getView()->dragSourceSystemDragEnded();
return;
}
MessageLoopForUI::current()->AddObserver(this);
}
WebKit::WebView* WebDragSource::getView() {
return browser_->UIT_GetWebView();
}
GtkWidget* WebDragSource::getNativeView() {
return browser_->UIT_GetWebViewHost()->view_handle();
}
void WebDragSource::WillProcessEvent(GdkEvent* event) {
// No-op.
}
void WebDragSource::DidProcessEvent(GdkEvent* event) {
if (event->type != GDK_MOTION_NOTIFY)
return;
GdkEventMotion* event_motion = reinterpret_cast<GdkEventMotion*>(event);
gfx::Point client = ui::ClientPoint(getNativeView());
gfx::Point screen(static_cast<int>(event_motion->x_root),
static_cast<int>(event_motion->y_root));
getView()->dragSourceMovedTo(client, screen, WebDragOperationNone);
}
void WebDragSource::OnDragDataGet(GtkWidget* sender,
GdkDragContext* context,
GtkSelectionData* selection_data,
guint target_type,
guint time) {
const int kBitsPerByte = 8;
switch (target_type) {
case ui::TEXT_PLAIN: {
std::string utf8_text = UTF16ToUTF8(drop_data_->text.string());
gtk_selection_data_set_text(selection_data, utf8_text.c_str(),
utf8_text.length());
break;
}
case ui::TEXT_HTML: {
// TODO(estade): change relative links to be absolute using
// |html_base_url|.
std::string utf8_text = UTF16ToUTF8(drop_data_->html.string());
gtk_selection_data_set(selection_data,
ui::GetAtomForTarget(ui::TEXT_HTML),
kBitsPerByte,
reinterpret_cast<const guchar*>(utf8_text.c_str()),
utf8_text.length());
break;
}
case ui::TEXT_URI_LIST:
case ui::CHROME_NAMED_URL:
case ui::NETSCAPE_URL: {
ui::WriteURLWithName(selection_data, drop_data_->url,
drop_data_->url_title, target_type);
break;
}
case ui::CHROME_WEBDROP_FILE_CONTENTS: {
gtk_selection_data_set(
selection_data,
drag_file_mime_type_, kBitsPerByte,
reinterpret_cast<const guchar*>(drop_data_->file_contents.data()),
drop_data_->file_contents.length());
break;
}
case ui::DIRECT_SAVE_FILE: {
char status_code = 'E';
// Retrieves the full file path (in file URL format) provided by the
// drop target by reading from the source window's XdndDirectSave0
// property.
gint file_url_len = 0;
guchar* file_url_value = NULL;
if (gdk_property_get(context->source_window,
ui::GetAtomForTarget(ui::DIRECT_SAVE_FILE),
ui::GetAtomForTarget(ui::TEXT_PLAIN_NO_CHARSET),
0,
1024,
FALSE,
NULL,
NULL,
&file_url_len,
&file_url_value) &&
file_url_value) {
// Convert from the file url to the file path.
GURL file_url(std::string(reinterpret_cast<char*>(file_url_value),
file_url_len));
g_free(file_url_value);
base::FilePath file_path;
if (net::FileURLToFilePath(file_url, &file_path)) {
// Open the file as a stream.
scoped_ptr<net::FileStream> file_stream(
drag_download_util::CreateFileStreamForDrop(&file_path));
if (file_stream.get()) {
WebView* webview = getView();
const GURL& page_url = webview->mainFrame()->document().url();
const std::string& page_encoding =
webview->mainFrame()->document().encoding().utf8();
// Start downloading the file to the stream.
scoped_refptr<DragDownloadFile> drag_file_downloader =
new DragDownloadFile(
file_path,
file_stream.Pass(),
download_url_,
page_url,
page_encoding,
browser_->UIT_GetWebViewDelegate());
drag_file_downloader->Start(
new drag_download_util::PromiseFileFinalizer(
drag_file_downloader));
// Set the status code to success.
status_code = 'S';
}
}
// Return the status code to the file manager.
gtk_selection_data_set(selection_data,
gtk_selection_data_get_target(selection_data),
kBitsPerByte,
reinterpret_cast<guchar*>(&status_code),
1);
}
break;
}
case ui::CUSTOM_DATA: {
Pickle custom_data;
ui::WriteCustomDataToPickle(drop_data_->custom_data, &custom_data);
gtk_selection_data_set(
selection_data,
ui::GetAtomForTarget(ui::CUSTOM_DATA),
kBitsPerByte,
reinterpret_cast<const guchar*>(custom_data.data()),
custom_data.size());
break;
}
default:
NOTREACHED();
}
}
gboolean WebDragSource::OnDragFailed(GtkWidget* sender,
GdkDragContext* context,
GtkDragResult result) {
drag_failed_ = true;
GtkWidget* native_view = getNativeView();
gfx::Point client = ui::ClientPoint(native_view);
gfx::Point screen = ui::ScreenPoint(native_view);
getView()->dragSourceEndedAt(client, screen, WebDragOperationNone);
// Let the native failure animation run.
return FALSE;
}
void WebDragSource::OnDragBegin(GtkWidget* sender,
GdkDragContext* drag_context) {
if (!download_url_.is_empty()) {
// Generate the file name based on both mime type and proposed file name.
std::string default_name = "download";
base::FilePath generated_download_file_name =
net::GenerateFileName(download_url_,
std::string(),
std::string(),
download_file_name_.value(),
UTF16ToUTF8(wide_download_mime_type_),
default_name);
// Pass the file name to the drop target by setting the source window's
// XdndDirectSave0 property.
gdk_property_change(drag_context->source_window,
ui::GetAtomForTarget(ui::DIRECT_SAVE_FILE),
ui::GetAtomForTarget(ui::TEXT_PLAIN_NO_CHARSET),
8,
GDK_PROP_MODE_REPLACE,
reinterpret_cast<const guchar*>(
generated_download_file_name.value().c_str()),
generated_download_file_name.value().length());
}
if (drag_pixbuf_) {
gtk_widget_set_size_request(drag_icon_,
gdk_pixbuf_get_width(drag_pixbuf_),
gdk_pixbuf_get_height(drag_pixbuf_));
// We only need to do this once.
if (!gtk_widget_get_realized(drag_icon_)) {
GdkScreen* screen = gtk_widget_get_screen(drag_icon_);
GdkColormap* rgba = gdk_screen_get_rgba_colormap(screen);
if (rgba)
gtk_widget_set_colormap(drag_icon_, rgba);
}
gtk_drag_set_icon_widget(drag_context, drag_icon_,
image_offset_.x(), image_offset_.y());
}
}
void WebDragSource::OnDragEnd(GtkWidget* sender,
GdkDragContext* drag_context) {
if (drag_pixbuf_) {
g_object_unref(drag_pixbuf_);
drag_pixbuf_ = NULL;
}
MessageLoopForUI::current()->RemoveObserver(this);
if (!download_url_.is_empty()) {
gdk_property_delete(drag_context->source_window,
ui::GetAtomForTarget(ui::DIRECT_SAVE_FILE));
}
if (!drag_failed_) {
GtkWidget* native_view = getNativeView();
gfx::Point client = ui::ClientPoint(native_view);
gfx::Point screen = ui::ScreenPoint(native_view);
getView()->dragSourceEndedAt(client, screen,
web_drag_utils_gtk::GdkDragActionToWebDragOp(drag_context->action));
}
getView()->dragSourceSystemDragEnded();
drop_data_.reset();
drag_context_ = NULL;
}
gboolean WebDragSource::OnDragIconExpose(GtkWidget* sender,
GdkEventExpose* event) {
cairo_t* cr = gdk_cairo_create(event->window);
gdk_cairo_rectangle(cr, &event->area);
cairo_clip(cr);
cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
gdk_cairo_set_source_pixbuf(cr, drag_pixbuf_, 0, 0);
cairo_paint(cr);
cairo_destroy(cr);
return TRUE;
}
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