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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 "base/callback_forward.h"
#include "content/common/content_export.h"
#include "content/public/browser/render_widget_host.h"
#include "content/public/common/file_chooser_params.h"
#include "content/public/common/page_zoom.h"
#include "third_party/WebKit/public/web/WebDragOperation.h"
#include "third_party/mojo/src/mojo/public/cpp/system/core.h"
class GURL;
namespace base {
class FilePath;
class Value;
namespace blink {
struct WebMediaPlayerAction;
struct WebPluginAction;
namespace gfx {
class Point;
namespace content {
class ChildProcessSecurityPolicy;
class RenderFrameHost;
class RenderViewHostDelegate;
class SessionStorageNamespace;
class SiteInstance;
struct DropData;
struct FileChooserFileInfo;
struct WebPreferences;
// A RenderViewHost is responsible for creating and talking to a RenderView
// object in a child process. It exposes a high level API to users, for things
// like loading pages, adjusting the display and other browser functionality,
// which it translates into IPC messages sent over the IPC channel with the
// RenderView. It responds to all IPC messages sent by that RenderView and
// cracks them, calling a delegate object back with higher level types where
// possible.
// The intent of this interface is to provide a view-agnostic communication
// conduit with a renderer. This is so we can build HTML views not only as
// WebContents (see WebContents for an example) but also as views, etc.
// DEPRECATED: RenderViewHost is being removed as part of the SiteIsolation
// project. New code should not be added here, but to either RenderFrameHost
// (if frame specific) or WebContents (if page specific).
// For context, please see and
class CONTENT_EXPORT RenderViewHost : virtual public RenderWidgetHost {
// Returns the RenderViewHost given its ID and the ID of its render process.
// Returns nullptr if the IDs do not correspond to a live RenderViewHost.
static RenderViewHost* FromID(int render_process_id, int render_view_id);
// Downcasts from a RenderWidgetHost to a RenderViewHost. Required
// because RenderWidgetHost is a virtual base class.
static RenderViewHost* From(RenderWidgetHost* rwh);
~RenderViewHost() override {}
// Returns the main frame for this render view.
virtual RenderFrameHost* GetMainFrame() = 0;
// Tell the render view to enable a set of javascript bindings. The argument
// should be a combination of values from BindingsPolicy.
virtual void AllowBindings(int binding_flags) = 0;
// Tells the renderer to clear the focused element (if any).
virtual void ClearFocusedElement() = 0;
// Returns true if the current focused element is editable.
virtual bool IsFocusedElementEditable() = 0;
// Copies the image at location x, y to the clipboard (if there indeed is an
// image at that location).
virtual void CopyImageAt(int x, int y) = 0;
// Saves the image at location x, y to the disk (if there indeed is an
// image at that location).
virtual void SaveImageAt(int x, int y) = 0;
// Notifies the listener that a directory enumeration is complete.
virtual void DirectoryEnumerationFinished(
int request_id,
const std::vector<base::FilePath>& files) = 0;
// Tells the renderer not to add scrollbars with height and width below a
// threshold.
virtual void DisableScrollbarsForThreshold(const gfx::Size& size) = 0;
// Notifies the renderer that a a drag operation that it started has ended,
// either in a drop or by being cancelled.
virtual void DragSourceEndedAt(
int client_x, int client_y, int screen_x, int screen_y,
blink::WebDragOperation operation) = 0;
// Notifies the renderer that we're done with the drag and drop operation.
// This allows the renderer to reset some state.
virtual void DragSourceSystemDragEnded() = 0;
// D&d drop target messages that get sent to WebKit.
virtual void DragTargetDragEnter(
const DropData& drop_data,
const gfx::Point& client_pt,
const gfx::Point& screen_pt,
blink::WebDragOperationsMask operations_allowed,
int key_modifiers) = 0;
virtual void DragTargetDragOver(
const gfx::Point& client_pt,
const gfx::Point& screen_pt,
blink::WebDragOperationsMask operations_allowed,
int key_modifiers) = 0;
virtual void DragTargetDragLeave() = 0;
virtual void DragTargetDrop(const gfx::Point& client_pt,
const gfx::Point& screen_pt,
int key_modifiers) = 0;
// Instructs the RenderView to automatically resize and send back updates
// for the new size.
virtual void EnableAutoResize(const gfx::Size& min_size,
const gfx::Size& max_size) = 0;
// Turns off auto-resize and gives a new size that the view should be.
virtual void DisableAutoResize(const gfx::Size& new_size) = 0;
// Instructs the RenderView to send back updates to the preferred size.
virtual void EnablePreferredSizeMode() = 0;
// Tells the renderer to perform the given action on the media player
// located at the given point.
virtual void ExecuteMediaPlayerActionAtLocation(
const gfx::Point& location,
const blink::WebMediaPlayerAction& action) = 0;
// Tells the renderer to perform the given action on the plugin located at
// the given point.
virtual void ExecutePluginActionAtLocation(
const gfx::Point& location, const blink::WebPluginAction& action) = 0;
// Notifies the Listener that one or more files have been chosen by the user
// from a file chooser dialog for the form. |permissions| is the file
// selection mode in which the chooser dialog was created.
virtual void FilesSelectedInChooser(
const std::vector<content::FileChooserFileInfo>& files,
FileChooserParams::Mode permissions) = 0;
virtual RenderViewHostDelegate* GetDelegate() const = 0;
// Returns a bitwise OR of bindings types that have been enabled for this
// RenderView. See BindingsPolicy for details.
virtual int GetEnabledBindings() const = 0;
virtual SiteInstance* GetSiteInstance() const = 0;
// Returns true if the RenderView is active and has not crashed.
virtual bool IsRenderViewLive() const = 0;
// Notification that a move or resize renderer's containing window has
// started.
virtual void NotifyMoveOrResizeStarted() = 0;
// Sets a property with the given name and value on the Web UI binding object.
// Must call AllowWebUIBindings() on this renderer first.
virtual void SetWebUIProperty(const std::string& name,
const std::string& value) = 0;
// Changes the zoom level for the current main frame.
virtual void Zoom(PageZoom zoom) = 0;
// Send the renderer process the current preferences supplied by the
// RenderViewHostDelegate.
virtual void SyncRendererPrefs() = 0;
// Returns the current WebKit preferences. Note: WebPreferences is cached, so
// this lookup will be fast
virtual WebPreferences GetWebkitPreferences() = 0;
// If any state that affects the webkit preferences changed, this method must
// be called. This triggers recomputing preferences.
virtual void OnWebkitPreferencesChanged() = 0;
// Passes a list of Webkit preferences to the renderer.
virtual void UpdateWebkitPreferences(const WebPreferences& prefs) = 0;
// Notify the render view host to select the word around the caret.
virtual void SelectWordAroundCaret() = 0;
#if defined(OS_ANDROID)
// Selects and zooms to the find result nearest to the point (x,y)
// defined in find-in-page coordinates.
virtual void ActivateNearestFindResult(int request_id, float x, float y) = 0;
// Asks the renderer to send the rects of the current find matches.
virtual void RequestFindMatchRects(int current_version) = 0;
// This interface should only be implemented inside content.
friend class RenderViewHostImpl;
RenderViewHost() {}
} // namespace content