blob: 6480b384706928e7b4bc6c530b5fbc144c246d1b [file] [log] [blame]
// Copyright (c) 2011 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 "webkit/tools/test_shell/webwidget_host.h"
#include <cairo/cairo.h>
#include <gtk/gtk.h>
#include "base/basictypes.h"
#include "base/logging.h"
#include "skia/ext/bitmap_platform_device.h"
#include "skia/ext/platform_canvas.h"
#include "skia/ext/platform_device.h"
#include "third_party/WebKit/Source/WebKit/chromium/public/gtk/WebInputEventFactory.h"
#include "third_party/WebKit/Source/WebKit/chromium/public/x11/WebScreenInfoFactory.h"
#include "third_party/WebKit/Source/WebKit/chromium/public/WebInputEvent.h"
#include "third_party/WebKit/Source/WebKit/chromium/public/WebPopupMenu.h"
#include "third_party/WebKit/Source/WebKit/chromium/public/WebScreenInfo.h"
#include "third_party/WebKit/Source/WebKit/chromium/public/WebSize.h"
#include "webkit/tools/test_shell/test_shell.h"
#include "webkit/tools/test_shell/test_shell_x11.h"
using WebKit::WebInputEventFactory;
using WebKit::WebKeyboardEvent;
using WebKit::WebMouseEvent;
using WebKit::WebMouseWheelEvent;
using WebKit::WebPopupMenu;
using WebKit::WebScreenInfo;
using WebKit::WebScreenInfoFactory;
using WebKit::WebSize;
using WebKit::WebWidgetClient;
namespace {
// Used to store a backpointer to WebWidgetHost from our GtkWidget.
const char kWebWidgetHostKey[] = "webwidgethost";
// In response to an invalidation, we call into WebKit to do layout. On
// Windows, WM_PAINT is a virtual message so any extra invalidates that come up
// while it's doing layout are implicitly swallowed as soon as we actually do
// drawing via BeginPaint.
// Though GTK does know how to collapse multiple paint requests, it won't erase
// paint requests from the future when we start drawing. To avoid an infinite
// cycle of repaints, we track whether we're currently handling a redraw, and
// during that if we get told by WebKit that a region has become invalid, we
// still add that region to the local dirty rect but *don't* enqueue yet
// another "do a paint" message.
bool g_handling_expose = false;
// -----------------------------------------------------------------------------
// Callback functions to proxy to host...
// The web contents are completely drawn and handled by WebKit, except that
// windowed plugins are GtkSockets on top of it. We need to place the
// GtkSockets inside a GtkContainer. We use a GtkFixed container, and the
// GtkSocket objects override a little bit to manage their size (see the code
// in We listen on a the events we're
// interested in and forward them on to the WebWidgetHost. This class is a
// collection of static methods, implementing the widget related code.
class WebWidgetHostGtkWidget {
// This will create a new widget used for hosting the web contents. We use
// our GtkDrawingAreaContainer here, for the reasons mentioned above.
static GtkWidget* CreateNewWidget(GtkWidget* parent_view,
WebWidgetHost* host) {
GtkWidget* widget = gtk_fixed_new();
gtk_fixed_set_has_window(GTK_FIXED(widget), true);
gtk_box_pack_start(GTK_BOX(parent_view), widget, TRUE, TRUE, 0);
gtk_widget_add_events(widget, GDK_EXPOSURE_MASK |
gtk_widget_set_can_focus(widget, TRUE);
g_signal_connect(widget, "size-request",
G_CALLBACK(&HandleSizeRequest), host);
g_signal_connect(widget, "size-allocate",
G_CALLBACK(&HandleSizeAllocate), host);
g_signal_connect(widget, "configure-event",
G_CALLBACK(&HandleConfigure), host);
g_signal_connect(widget, "expose-event",
G_CALLBACK(&HandleExpose), host);
g_signal_connect(widget, "destroy",
G_CALLBACK(&HandleDestroy), host);
g_signal_connect(widget, "key-press-event",
G_CALLBACK(&HandleKeyPress), host);
g_signal_connect(widget, "key-release-event",
G_CALLBACK(&HandleKeyRelease), host);
g_signal_connect(widget, "focus",
G_CALLBACK(&HandleFocus), host);
g_signal_connect(widget, "focus-in-event",
G_CALLBACK(&HandleFocusIn), host);
g_signal_connect(widget, "focus-out-event",
G_CALLBACK(&HandleFocusOut), host);
g_signal_connect(widget, "button-press-event",
G_CALLBACK(&HandleButtonPress), host);
g_signal_connect(widget, "button-release-event",
G_CALLBACK(&HandleButtonRelease), host);
g_signal_connect(widget, "motion-notify-event",
G_CALLBACK(&HandleMotionNotify), host);
g_signal_connect(widget, "scroll-event",
G_CALLBACK(&HandleScroll), host);
g_object_set_data(G_OBJECT(widget), kWebWidgetHostKey, host);
return widget;
// Our size was requested. We let the GtkFixed do its normal calculation,
// after which this callback is called. The GtkFixed will come up with a
// requisition based on its children, which include plugin windows. Since
// we don't want to prevent resizing smaller than a plugin window, we need to
// control the size ourself.
static void HandleSizeRequest(GtkWidget* widget,
GtkRequisition* req,
WebWidgetHost* host) {
// This is arbitrary, but the WebKit scrollbars try to shrink themselves
// if the browser window is too small. Give them some space.
static const int kMinWidthHeight = 64;
req->width = kMinWidthHeight;
req->height = kMinWidthHeight;
// Our size has changed.
static void HandleSizeAllocate(GtkWidget* widget,
GtkAllocation* allocation,
WebWidgetHost* host) {
host->Resize(WebSize(allocation->width, allocation->height));
// Size, position, or stacking of the GdkWindow changed.
static gboolean HandleConfigure(GtkWidget* widget,
GdkEventConfigure* config,
WebWidgetHost* host) {
host->Resize(WebSize(config->width, config->height));
return FALSE;
// A portion of the GdkWindow needs to be redraw.
static gboolean HandleExpose(GtkWidget* widget,
GdkEventExpose* expose,
WebWidgetHost* host) {
// See comments above about what g_handling_expose is for.
g_handling_expose = true;
gfx::Rect rect(expose->area);
g_handling_expose = false;
return FALSE;
// The GdkWindow was destroyed.
static gboolean HandleDestroy(GtkWidget* widget, void* unused) {
// The associated WebWidgetHost instance may have already been destroyed.
WebWidgetHost* host = static_cast<WebWidgetHost*>(
g_object_get_data(G_OBJECT(widget), kWebWidgetHostKey));
if (host)
return FALSE;
// Keyboard key pressed.
static gboolean HandleKeyPress(GtkWidget* widget,
GdkEventKey* event,
WebWidgetHost* host) {
// In the browser we do a ton of work with IMEs. This is some minimal
// code to make basic text work in test_shell, but doesn't cover IME.
// This is a copy of the logic in ProcessUnfilteredKeyPressEvent in
// .
if (event->type == GDK_KEY_PRESS) {
WebKeyboardEvent wke = WebInputEventFactory::keyboardEvent(event);
if (wke.text[0]) {
wke.type = WebKit::WebInputEvent::Char;
return FALSE;
// Keyboard key released.
static gboolean HandleKeyRelease(GtkWidget* widget,
GdkEventKey* event,
WebWidgetHost* host) {
return HandleKeyPress(widget, event, host);
// This signal is called when arrow keys or tab is pressed. If we return
// true, we prevent focus from being moved to another widget. If we want to
// allow focus to be moved outside of web contents, we need to implement
// WebViewDelegate::TakeFocus in the test webview delegate.
static gboolean HandleFocus(GtkWidget* widget,
GdkEventFocus* focus,
WebWidgetHost* host) {
return TRUE;
// Keyboard focus entered.
static gboolean HandleFocusIn(GtkWidget* widget,
GdkEventFocus* focus,
WebWidgetHost* host) {
// Ignore focus calls in layout test mode so that tests don't mess with each
// other's focus when running in parallel.
if (!TestShell::layout_test_mode())
return TRUE;
// Keyboard focus left.
static gboolean HandleFocusOut(GtkWidget* widget,
GdkEventFocus* focus,
WebWidgetHost* host) {
// Ignore focus calls in layout test mode so that tests don't mess with each
// other's focus when running in parallel.
if (!TestShell::layout_test_mode())
return TRUE;
// Mouse button down.
static gboolean HandleButtonPress(GtkWidget* widget,
GdkEventButton* event,
WebWidgetHost* host) {
if (!(event->button == 1 || event->button == 2 || event->button == 3))
return FALSE; // We do not forward any other buttons to the renderer.
if (event->type == GDK_2BUTTON_PRESS || event->type == GDK_3BUTTON_PRESS)
return FALSE;
return FALSE;
// Mouse button up.
static gboolean HandleButtonRelease(GtkWidget* widget,
GdkEventButton* event,
WebWidgetHost* host) {
return HandleButtonPress(widget, event, host);
// Mouse pointer movements.
static gboolean HandleMotionNotify(GtkWidget* widget,
GdkEventMotion* event,
WebWidgetHost* host) {
return FALSE;
// Mouse scroll wheel.
static gboolean HandleScroll(GtkWidget* widget,
GdkEventScroll* event,
WebWidgetHost* host) {
return FALSE;
} // namespace
// This is provided so that the webview can reuse the custom GTK window code.
// static
gfx::NativeView WebWidgetHost::CreateWidget(
gfx::NativeView parent_view, WebWidgetHost* host) {
return WebWidgetHostGtkWidget::CreateNewWidget(parent_view, host);
// static
WebWidgetHost* WebWidgetHost::Create(GtkWidget* parent_view,
WebWidgetClient* client) {
WebWidgetHost* host = new WebWidgetHost();
host->view_ = CreateWidget(parent_view, host);
host->webwidget_ = WebPopupMenu::create(client);
// We manage our own double buffering because we need to be able to update
// the expose area in an ExposeEvent within the lifetime of the event handler.
gtk_widget_set_double_buffered(GTK_WIDGET(host->view_), false);
return host;
void WebWidgetHost::UpdatePaintRect(const gfx::Rect& rect) {
paint_rect_ = paint_rect_.Union(rect);
void WebWidgetHost::DidInvalidateRect(const gfx::Rect& damaged_rect) {
DLOG_IF(WARNING, painting_) << "unexpected invalidation while painting";
if (!g_handling_expose) {
gtk_widget_queue_draw_area(GTK_WIDGET(view_), damaged_rect.x(),
damaged_rect.y(), damaged_rect.width(), damaged_rect.height());
void WebWidgetHost::DidScrollRect(int dx, int dy, const gfx::Rect& clip_rect) {
// This is used for optimizing painting when the renderer is scrolled. We're
// currently not doing any optimizations so just invalidate the region.
void WebWidgetHost::ScheduleComposite() {
int width = logical_size_.width();
int height = logical_size_.height();
GdkRectangle grect = {
GdkWindow* window = view_->window;
gdk_window_invalidate_rect(window, &grect, 0);
: view_(NULL),
WebWidgetHost::~WebWidgetHost() {
// We may be deleted before the view_. Clear out the signals so that we don't
// attempt to invoke something on a deleted object.
g_object_set_data(G_OBJECT(view_), kWebWidgetHostKey, NULL);
void WebWidgetHost::Resize(const gfx::Size &newsize) {
// The pixel buffer backing us is now the wrong size
logical_size_ = newsize;
void WebWidgetHost::Paint() {
int width = logical_size_.width();
int height = logical_size_.height();
gfx::Rect client_rect(width, height);
// Allocate a canvas if necessary
if (!canvas_.get()) {
paint_rect_ = client_rect;
canvas_.reset(new skia::PlatformCanvas(width, height, true));
if (!canvas_.get()) {
// memory allocation failed, we can't paint.
LOG(ERROR) << "Failed to allocate memory for " << width << "x" << height;
// This may result in more invalidation
// Paint the canvas if necessary. Allow painting to generate extra rects the
// first time we call it. This is necessary because some WebCore rendering
// objects update their layout only when painted.
// Store the total area painted in total_paint. Then tell the gdk window
// to update that area after we're done painting it.
gfx::Rect total_paint;
for (int i = 0; i < 2; ++i) {
paint_rect_ = client_rect.Intersect(paint_rect_);
if (!paint_rect_.IsEmpty()) {
gfx::Rect rect(paint_rect_);
paint_rect_ = gfx::Rect();
DLOG_IF(WARNING, i == 1) << "painting caused additional invalidations";
total_paint = total_paint.Union(rect);
// Invalidate the paint region on the widget's underlying gdk window. Note
// that gdk_window_invalidate_* will generate extra expose events, which
// we wish to avoid. So instead we use calls to begin_paint/end_paint.
GdkRectangle grect = {
GdkWindow* window = view_->window;
gdk_window_begin_paint_rect(window, &grect);
// BitBlit to the gdk window.
skia::ScopedPlatformPaint scoped_platform_paint(canvas_.get());
cairo_t* source_surface = scoped_platform_paint.GetPlatformSurface();
cairo_t* cairo_drawable = gdk_cairo_create(window);
cairo_set_source_surface(cairo_drawable, cairo_get_target(source_surface),
0, 0);
WebScreenInfo WebWidgetHost::GetScreenInfo() {
Display* display = test_shell_x11::GtkWidgetGetDisplay(view_);
int screen_num = test_shell_x11::GtkWidgetGetScreenNum(view_);
return WebScreenInfoFactory::screenInfo(display, screen_num);
void WebWidgetHost::ResetScrollRect() {
// This method is only needed for optimized scroll painting, which we don't
// care about in the test shell, yet.
void WebWidgetHost::PaintRect(const gfx::Rect& rect) {
webwidget_->paint(canvas_.get(), rect);
void WebWidgetHost::WindowDestroyed() {
delete this;