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// 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 "content/browser/web_contents/web_drag_source_win.h"
#include "base/bind.h"
#include "content/browser/renderer_host/render_view_host_impl.h"
#include "content/browser/web_contents/web_drag_utils_win.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/notification_source.h"
#include "content/public/browser/notification_types.h"
#include "content/public/browser/web_contents.h"
using WebKit::WebDragOperationNone;
namespace content {
namespace {
static void GetCursorPositions(gfx::NativeWindow wnd, gfx::Point* client,
gfx::Point* screen) {
POINT cursor_pos;
GetCursorPos(&cursor_pos);
screen->SetPoint(cursor_pos.x, cursor_pos.y);
ScreenToClient(wnd, &cursor_pos);
client->SetPoint(cursor_pos.x, cursor_pos.y);
}
} // namespace
///////////////////////////////////////////////////////////////////////////////
// WebDragSource, public:
WebDragSource::WebDragSource(gfx::NativeWindow source_wnd,
WebContents* web_contents)
: ui::DragSource(),
source_wnd_(source_wnd),
render_view_host_(web_contents->GetRenderViewHost()),
effect_(DROPEFFECT_NONE) {
registrar_.Add(this, NOTIFICATION_WEB_CONTENTS_SWAPPED,
Source<WebContents>(web_contents));
registrar_.Add(this, NOTIFICATION_WEB_CONTENTS_DISCONNECTED,
Source<WebContents>(web_contents));
}
WebDragSource::~WebDragSource() {
}
void WebDragSource::OnDragSourceCancel() {
// Delegate to the UI thread if we do drag-and-drop in the background thread.
if (!BrowserThread::CurrentlyOn(BrowserThread::UI)) {
BrowserThread::PostTask(
BrowserThread::UI, FROM_HERE,
base::Bind(&WebDragSource::OnDragSourceCancel, this));
return;
}
if (!render_view_host_)
return;
gfx::Point client;
gfx::Point screen;
GetCursorPositions(source_wnd_, &client, &screen);
render_view_host_->DragSourceEndedAt(client.x(), client.y(),
screen.x(), screen.y(),
WebDragOperationNone);
}
void WebDragSource::OnDragSourceDrop() {
// On Windows, we check for drag end in IDropSource::QueryContinueDrag which
// happens before IDropTarget::Drop is called. HTML5 requires the "dragend"
// event to happen after the "drop" event. Since Windows calls these two
// directly after each other we can just post a task to handle the
// OnDragSourceDrop after the current task.
BrowserThread::PostTask(
BrowserThread::UI, FROM_HERE,
base::Bind(&WebDragSource::DelayedOnDragSourceDrop, this));
}
void WebDragSource::DelayedOnDragSourceDrop() {
if (!render_view_host_)
return;
gfx::Point client;
gfx::Point screen;
GetCursorPositions(source_wnd_, &client, &screen);
render_view_host_->DragSourceEndedAt(
client.x(), client.y(), screen.x(), screen.y(),
WinDragOpToWebDragOp(effect_));
}
void WebDragSource::OnDragSourceMove() {
// Delegate to the UI thread if we do drag-and-drop in the background thread.
if (!BrowserThread::CurrentlyOn(BrowserThread::UI)) {
BrowserThread::PostTask(
BrowserThread::UI, FROM_HERE,
base::Bind(&WebDragSource::OnDragSourceMove, this));
return;
}
if (!render_view_host_)
return;
gfx::Point client;
gfx::Point screen;
GetCursorPositions(source_wnd_, &client, &screen);
render_view_host_->DragSourceMovedTo(client.x(), client.y(),
screen.x(), screen.y());
}
void WebDragSource::Observe(int type,
const NotificationSource& source,
const NotificationDetails& details) {
if (type == NOTIFICATION_WEB_CONTENTS_SWAPPED) {
// When the WebContents get swapped, our render view host goes away.
// That's OK, we can continue the drag, we just can't send messages back to
// our drag source.
render_view_host_ = NULL;
} else if (type == NOTIFICATION_WEB_CONTENTS_DISCONNECTED) {
// This could be possible when we close the tab and the source is still
// being used in DoDragDrop at the time that the virtual file is being
// downloaded.
render_view_host_ = NULL;
}
}
} // namespace content
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