499 lines
18 KiB
C++
499 lines
18 KiB
C++
// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "libcef/webwidget_host.h"
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#include <cairo/cairo.h>
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#include <gdk/gdkx.h>
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#include <gtk/gtk.h>
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#include "base/basictypes.h"
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#include "base/logging.h"
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#include "skia/ext/bitmap_platform_device.h"
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#include "skia/ext/platform_canvas.h"
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#include "skia/ext/platform_device.h"
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#include "third_party/WebKit/Source/WebKit/chromium/public/gtk/WebInputEventFactory.h"
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#include "third_party/WebKit/Source/WebKit/chromium/public/x11/WebScreenInfoFactory.h"
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#include "third_party/WebKit/Source/WebKit/chromium/public/WebInputEvent.h"
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#include "third_party/WebKit/Source/WebKit/chromium/public/WebPopupMenu.h"
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#include "third_party/WebKit/Source/WebKit/chromium/public/WebScreenInfo.h"
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#include "third_party/WebKit/Source/WebKit/chromium/public/platform/WebSize.h"
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using WebKit::WebInputEventFactory;
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using WebKit::WebKeyboardEvent;
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using WebKit::WebMouseEvent;
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using WebKit::WebMouseWheelEvent;
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using WebKit::WebPopupMenu;
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using WebKit::WebScreenInfo;
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using WebKit::WebScreenInfoFactory;
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using WebKit::WebSize;
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using WebKit::WebWidgetClient;
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namespace {
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// Used to store a backpointer to WebWidgetHost from our GtkWidget.
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const char kWebWidgetHostKey[] = "webwidgethost";
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// In response to an invalidation, we call into WebKit to do layout. On
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// Windows, WM_PAINT is a virtual message so any extra invalidates that come up
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// while it's doing layout are implicitly swallowed as soon as we actually do
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// drawing via BeginPaint.
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//
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// Though GTK does know how to collapse multiple paint requests, it won't erase
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// paint requests from the future when we start drawing. To avoid an infinite
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// cycle of repaints, we track whether we're currently handling a redraw, and
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// during that if we get told by WebKit that a region has become invalid, we
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// still add that region to the local dirty rect but *don't* enqueue yet
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// another "do a paint" message.
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bool g_handling_expose = false;
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// -----------------------------------------------------------------------------
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// Callback functions to proxy to host...
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// The web contents are completely drawn and handled by WebKit, except that
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// windowed plugins are GtkSockets on top of it. We need to place the
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// GtkSockets inside a GtkContainer. We use a GtkFixed container, and the
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// GtkSocket objects override a little bit to manage their size (see the code
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// in webplugin_delegate_impl_gtk.cc). We listen on a the events we're
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// interested in and forward them on to the WebWidgetHost. This class is a
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// collection of static methods, implementing the widget related code.
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class WebWidgetHostGtkWidget {
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public:
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// This will create a new widget used for hosting the web contents. We use
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// our GtkDrawingAreaContainer here, for the reasons mentioned above.
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static GtkWidget* CreateNewWidget(GtkWidget* parent_view,
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WebWidgetHost* host) {
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GtkWidget* widget = gtk_fixed_new();
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gtk_fixed_set_has_window(GTK_FIXED(widget), true);
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gtk_box_pack_start(GTK_BOX(parent_view), widget, TRUE, TRUE, 0);
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gtk_widget_add_events(widget, GDK_EXPOSURE_MASK |
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GDK_POINTER_MOTION_MASK |
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GDK_BUTTON_PRESS_MASK |
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GDK_BUTTON_RELEASE_MASK |
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GDK_KEY_PRESS_MASK |
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GDK_KEY_RELEASE_MASK);
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gtk_widget_set_can_focus(widget, TRUE);
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g_signal_connect(widget, "size-request",
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G_CALLBACK(&HandleSizeRequest), host);
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g_signal_connect(widget, "size-allocate",
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G_CALLBACK(&HandleSizeAllocate), host);
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g_signal_connect(widget, "configure-event",
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G_CALLBACK(&HandleConfigure), host);
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g_signal_connect(widget, "expose-event",
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G_CALLBACK(&HandleExpose), host);
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g_signal_connect(widget, "key-press-event",
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G_CALLBACK(&HandleKeyPress), host);
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g_signal_connect(widget, "key-release-event",
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G_CALLBACK(&HandleKeyRelease), host);
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g_signal_connect(widget, "focus",
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G_CALLBACK(&HandleFocus), host);
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g_signal_connect(widget, "focus-in-event",
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G_CALLBACK(&HandleFocusIn), host);
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g_signal_connect(widget, "focus-out-event",
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G_CALLBACK(&HandleFocusOut), host);
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g_signal_connect(widget, "button-press-event",
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G_CALLBACK(&HandleButtonPress), host);
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g_signal_connect(widget, "button-release-event",
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G_CALLBACK(&HandleButtonRelease), host);
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g_signal_connect(widget, "motion-notify-event",
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G_CALLBACK(&HandleMotionNotify), host);
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g_signal_connect(widget, "scroll-event",
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G_CALLBACK(&HandleScroll), host);
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g_object_set_data(G_OBJECT(widget), kWebWidgetHostKey, host);
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return widget;
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}
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private:
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// Our size was requested. We let the GtkFixed do its normal calculation,
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// after which this callback is called. The GtkFixed will come up with a
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// requisition based on its children, which include plugin windows. Since
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// we don't want to prevent resizing smaller than a plugin window, we need to
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// control the size ourself.
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static void HandleSizeRequest(GtkWidget* widget,
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GtkRequisition* req,
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WebWidgetHost* host) {
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// This is arbitrary, but the WebKit scrollbars try to shrink themselves
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// if the browser window is too small. Give them some space.
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static const int kMinWidthHeight = 64;
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req->width = kMinWidthHeight;
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req->height = kMinWidthHeight;
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}
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// Our size has changed.
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static void HandleSizeAllocate(GtkWidget* widget,
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GtkAllocation* allocation,
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WebWidgetHost* host) {
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host->Resize(WebSize(allocation->width, allocation->height));
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}
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// Size, position, or stacking of the GdkWindow changed.
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static gboolean HandleConfigure(GtkWidget* widget,
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GdkEventConfigure* config,
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WebWidgetHost* host) {
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host->Resize(WebSize(config->width, config->height));
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return FALSE;
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}
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// A portion of the GdkWindow needs to be redraw.
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static gboolean HandleExpose(GtkWidget* widget,
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GdkEventExpose* expose,
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WebWidgetHost* host) {
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// See comments above about what g_handling_expose is for.
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g_handling_expose = true;
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gfx::Rect rect(expose->area);
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host->UpdatePaintRect(rect);
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host->Paint();
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g_handling_expose = false;
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return FALSE;
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}
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// Keyboard key pressed.
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static gboolean HandleKeyPress(GtkWidget* widget,
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GdkEventKey* event,
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WebWidgetHost* host) {
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host->KeyEvent(event);
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return FALSE;
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}
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// Keyboard key released.
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static gboolean HandleKeyRelease(GtkWidget* widget,
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GdkEventKey* event,
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WebWidgetHost* host) {
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return HandleKeyPress(widget, event, host);
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}
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// This signal is called when arrow keys or tab is pressed. If we return
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// true, we prevent focus from being moved to another widget. If we want to
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// allow focus to be moved outside of web contents, we need to implement
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// WebViewDelegate::TakeFocus in the test webview delegate.
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static gboolean HandleFocus(GtkWidget* widget,
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GdkEventFocus* focus,
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WebWidgetHost* host) {
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return TRUE;
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}
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// Keyboard focus entered.
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static gboolean HandleFocusIn(GtkWidget* widget,
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GdkEventFocus* focus,
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WebWidgetHost* host) {
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host->webwidget()->setFocus(true);
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return TRUE;
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}
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// Keyboard focus left.
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static gboolean HandleFocusOut(GtkWidget* widget,
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GdkEventFocus* focus,
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WebWidgetHost* host) {
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host->webwidget()->setFocus(false);
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return TRUE;
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}
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// Mouse button down.
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static gboolean HandleButtonPress(GtkWidget* widget,
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GdkEventButton* event,
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WebWidgetHost* host) {
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if (!(event->button == 1 || event->button == 2 || event->button == 3))
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return FALSE; // We do not forward any other buttons to the renderer.
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if (event->type == GDK_2BUTTON_PRESS || event->type == GDK_3BUTTON_PRESS)
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return FALSE;
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gtk_widget_grab_focus(widget);
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host->webwidget()->handleInputEvent(
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WebInputEventFactory::mouseEvent(event));
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return FALSE;
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}
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// Mouse button up.
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static gboolean HandleButtonRelease(GtkWidget* widget,
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GdkEventButton* event,
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WebWidgetHost* host) {
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return HandleButtonPress(widget, event, host);
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}
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// Mouse pointer movements.
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static gboolean HandleMotionNotify(GtkWidget* widget,
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GdkEventMotion* event,
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WebWidgetHost* host) {
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host->webwidget()->handleInputEvent(
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WebInputEventFactory::mouseEvent(event));
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return FALSE;
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}
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// Mouse scroll wheel.
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static gboolean HandleScroll(GtkWidget* widget,
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GdkEventScroll* event,
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WebWidgetHost* host) {
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host->webwidget()->handleInputEvent(
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WebInputEventFactory::mouseWheelEvent(event));
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return FALSE;
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}
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DISALLOW_IMPLICIT_CONSTRUCTORS(WebWidgetHostGtkWidget);
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};
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// Return an Xlib Display pointer for the given widget.
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Display* GtkWidgetGetDisplay(GtkWidget* widget) {
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GdkDisplay* gdk_display = gtk_widget_get_display(widget);
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return gdk_x11_display_get_xdisplay(gdk_display);
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}
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// Return the screen number for the given widget.
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int GtkWidgetGetScreenNum(GtkWidget* widget) {
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GdkDisplay* gdk_display = gtk_widget_get_display(widget);
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GdkScreen* gdk_screen = gdk_display_get_default_screen(gdk_display);
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return gdk_x11_screen_get_screen_number(gdk_screen);
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}
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} // namespace
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// This is provided so that the webview can reuse the custom GTK window code.
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// static
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gfx::NativeView WebWidgetHost::CreateWidget(
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gfx::NativeView parent_view, WebWidgetHost* host) {
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return WebWidgetHostGtkWidget::CreateNewWidget(parent_view, host);
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}
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// static
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WebWidgetHost* WebWidgetHost::Create(GtkWidget* parent_view,
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WebWidgetClient* client,
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PaintDelegate* paint_delegate) {
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WebWidgetHost* host = new WebWidgetHost();
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host->view_ = CreateWidget(parent_view, host);
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host->webwidget_ = WebPopupMenu::create(client);
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// We manage our own double buffering because we need to be able to update
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// the expose area in an ExposeEvent within the lifetime of the event handler.
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gtk_widget_set_double_buffered(GTK_WIDGET(host->view_), false);
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return host;
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}
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void WebWidgetHost::DidInvalidateRect(const gfx::Rect& damaged_rect) {
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DLOG_IF(WARNING, painting_) << "unexpected invalidation while painting";
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UpdatePaintRect(damaged_rect);
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if (!g_handling_expose) {
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gtk_widget_queue_draw_area(GTK_WIDGET(view_), damaged_rect.x(),
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damaged_rect.y(), damaged_rect.width(), damaged_rect.height());
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}
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}
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void WebWidgetHost::DidScrollRect(int dx, int dy, const gfx::Rect& clip_rect) {
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// This is used for optimizing painting when the renderer is scrolled. We're
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// currently not doing any optimizations so just invalidate the region.
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DidInvalidateRect(clip_rect);
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}
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void WebWidgetHost::Invalidate() {
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int width = logical_size_.width();
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int height = logical_size_.height();
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GdkRectangle grect = {
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0,
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0,
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width,
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height
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};
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GdkWindow* window = view_->window;
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gdk_window_invalidate_rect(window, &grect, 0);
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}
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WebWidgetHost::WebWidgetHost()
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: view_(NULL),
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paint_delegate_(NULL),
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webwidget_(NULL),
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canvas_w_(0),
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canvas_h_(0),
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popup_(false),
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has_update_task_(false),
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has_invalidate_task_(false),
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ALLOW_THIS_IN_INITIALIZER_LIST(weak_factory_(this)) {
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set_painting(false);
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}
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WebWidgetHost::~WebWidgetHost() {
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// We may be deleted before the view_. Clear out the signals so that we don't
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// attempt to invoke something on a deleted object.
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g_object_set_data(G_OBJECT(view_), kWebWidgetHostKey, NULL);
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g_signal_handlers_disconnect_matched(view_,
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G_SIGNAL_MATCH_DATA, 0, 0, NULL, NULL, this);
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// TODO(port): Figure out why we can't do this without crashing.
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// webwidget_->close();
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}
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void WebWidgetHost::Resize(const gfx::Size &newsize) {
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logical_size_ = newsize;
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SetSize(newsize.width(), newsize.height());
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}
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void WebWidgetHost::Paint() {
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int width = logical_size_.width();
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int height = logical_size_.height();
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gfx::Rect client_rect(width, height);
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// Number of pixels that the canvas is allowed to differ from the client area.
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const int kCanvasGrowSize = 128;
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if (!canvas_.get() ||
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canvas_w_ < client_rect.width() ||
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canvas_h_ < client_rect.height() ||
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canvas_w_ > client_rect.width() + kCanvasGrowSize * 2 ||
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canvas_h_ > client_rect.height() + kCanvasGrowSize * 2) {
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paint_rect_ = client_rect;
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// Resize the canvas to be within a reasonable size of the client area.
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canvas_w_ = client_rect.width() + kCanvasGrowSize;
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canvas_h_ = client_rect.height() + kCanvasGrowSize;
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canvas_.reset(new skia::PlatformCanvas(canvas_w_, canvas_h_, true));
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if (!canvas_.get()) {
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// memory allocation failed, we can't paint.
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LOG(ERROR) << "Failed to allocate memory for " << width << "x" << height;
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return;
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}
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}
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webwidget_->animate(0.0);
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// This may result in more invalidation
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webwidget_->layout();
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// Paint the canvas if necessary. Allow painting to generate extra rects the
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// first time we call it. This is necessary because some WebCore rendering
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// objects update their layout only when painted.
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// Store the total area painted in total_paint. Then tell the gdk window
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// to update that area after we're done painting it.
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gfx::Rect total_paint;
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for (int i = 0; i < 2; ++i) {
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paint_rect_ = client_rect.Intersect(paint_rect_);
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if (!paint_rect_.IsEmpty()) {
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gfx::Rect rect(paint_rect_);
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paint_rect_ = gfx::Rect();
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DLOG_IF(WARNING, i == 1) << "painting caused additional invalidations";
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PaintRect(rect);
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total_paint = total_paint.Union(rect);
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}
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}
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// DCHECK(paint_rect_.IsEmpty());
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// Invalidate the paint region on the widget's underlying gdk window. Note
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// that gdk_window_invalidate_* will generate extra expose events, which
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// we wish to avoid. So instead we use calls to begin_paint/end_paint.
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GdkRectangle grect = {
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total_paint.x(),
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total_paint.y(),
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total_paint.width(),
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total_paint.height(),
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};
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GdkWindow* window = view_->window;
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gdk_window_begin_paint_rect(window, &grect);
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// BitBlit to the gdk window.
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skia::ScopedPlatformPaint scoped_platform_paint(canvas_.get());
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cairo_t* source_surface = scoped_platform_paint.GetPlatformSurface();
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cairo_t* cairo_drawable = gdk_cairo_create(window);
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cairo_set_source_surface(cairo_drawable, cairo_get_target(source_surface),
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0, 0);
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cairo_paint(cairo_drawable);
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cairo_destroy(cairo_drawable);
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gdk_window_end_paint(window);
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// Used with scheduled invalidation to maintain a consistent frame rate.
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paint_last_call_ = base::TimeTicks::Now();
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if (has_invalidate_task_)
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has_invalidate_task_ = false;
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}
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void WebWidgetHost::SetTooltipText(const CefString& tooltip_text) {
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// TODO(port): Implement this method as part of tooltip support.
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}
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void WebWidgetHost::InvalidateRect(const gfx::Rect& rect) {
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// TODO(port): Implement this method as part of off-screen rendering support.
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NOTIMPLEMENTED();
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}
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bool WebWidgetHost::GetImage(int width, int height, void* rgba_buffer) {
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if (!canvas_.get())
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return false;
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// TODO(port): Implement this method as part of off-screen rendering support.
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NOTIMPLEMENTED();
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return false;
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}
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WebScreenInfo WebWidgetHost::GetScreenInfo() {
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Display* display = GtkWidgetGetDisplay(view_);
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int screen_num = GtkWidgetGetScreenNum(view_);
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return WebScreenInfoFactory::screenInfo(display, screen_num);
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}
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void WebWidgetHost::PaintRect(const gfx::Rect& rect) {
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set_painting(true);
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webwidget_->paint(canvas_.get(), rect);
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set_painting(false);
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}
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void WebWidgetHost::SendKeyEvent(cef_key_type_t type, int key, int modifiers,
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bool sysChar, bool imeChar) {
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// TODO(port): Implement this method as part of off-screen rendering support.
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NOTIMPLEMENTED();
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}
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void WebWidgetHost::SendMouseClickEvent(int x, int y,
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cef_mouse_button_type_t type,
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bool mouseUp, int clickCount) {
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// TODO(port): Implement this method as part of off-screen rendering support.
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NOTIMPLEMENTED();
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}
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void WebWidgetHost::SendMouseMoveEvent(int x, int y, bool mouseLeave) {
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// TODO(port): Implement this method as part of off-screen rendering support.
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NOTIMPLEMENTED();
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}
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void WebWidgetHost::SendMouseWheelEvent(int x, int y, int delta) {
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// TODO(port): Implement this method as part of off-screen rendering support.
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NOTIMPLEMENTED();
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}
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void WebWidgetHost::SendFocusEvent(bool setFocus) {
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// TODO(port): Implement this method as part of off-screen rendering support.
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NOTIMPLEMENTED();
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}
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void WebWidgetHost::SendCaptureLostEvent() {
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// TODO(port): Implement this method as part of off-screen rendering support.
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NOTIMPLEMENTED();
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}
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void WebWidgetHost::EnsureTooltip() {
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// TODO(port): Implement this method as part of tooltip support.
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}
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void WebWidgetHost::ResetTooltip() {
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// TODO(port): Implement this method as part of tooltip support.
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}
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void WebWidgetHost::KeyEvent(GdkEventKey* event) {
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WebKeyboardEvent keyboard_event(WebInputEventFactory::keyboardEvent(event));
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last_key_event_ = keyboard_event;
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webwidget()->handleInputEvent(keyboard_event);
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// In the browser we do a ton of work with IMEs. This is some minimal
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// code to make basic text work in test_shell, but doesn't cover IME.
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// This is a copy of the logic in ProcessUnfilteredKeyPressEvent in
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// render_widget_host_view_gtk.cc .
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if (event->type == GDK_KEY_PRESS && keyboard_event.text[0]) {
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|
keyboard_event.type = WebKit::WebInputEvent::Char;
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|
last_key_event_ = keyboard_event;
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|
webwidget()->handleInputEvent(keyboard_event);
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|
}
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|
}
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