webkitwebview.cpp

linux下开源浏览器WebKit的源码,市面上的很多商用浏览器都是移植自WebKit

        break;
    case PROP_CUSTOM_ENCODING:
        webkit_web_view_set_custom_encoding(webView, g_value_get_string(value));
        break;
    default:
        G_OBJECT_WARN_INVALID_PROPERTY_ID(object, prop_id, pspec);
    }
}

static bool shouldCoalesce(GdkRectangle rect, GdkRectangle* rects, int count)
{
    const int cRectThreshold = 10;
    const float cWastedSpaceThreshold = 0.75f;
    bool useUnionedRect = (count <= 1) || (count > cRectThreshold);
    if (!useUnionedRect) {
        // Attempt to guess whether or not we should use the unioned rect or the individual rects.
        // We do this by computing the percentage of "wasted space" in the union.  If that wasted space
        // is too large, then we will do individual rect painting instead.
        float unionPixels = (rect.width * rect.height);
        float singlePixels = 0;
        for (int i = 0; i < count; ++i)
            singlePixels += rects[i].width * rects[i].height;
        float wastedSpace = 1 - (singlePixels / unionPixels);
        if (wastedSpace <= cWastedSpaceThreshold)
            useUnionedRect = true;
    }
    return useUnionedRect;
}

static gboolean webkit_web_view_expose_event(GtkWidget* widget, GdkEventExpose* event)
{
    WebKitWebView* webView = WEBKIT_WEB_VIEW(widget);
    WebKitWebViewPrivate* priv = webView->priv;

    Frame* frame = core(webView)->mainFrame();
    if (frame->contentRenderer() && frame->view()) {
        frame->view()->layoutIfNeededRecursive();

        cairo_t* cr = gdk_cairo_create(event->window);
        GraphicsContext ctx(cr);
        cairo_destroy(cr);
        ctx.setGdkExposeEvent(event);

        GOwnPtr<GdkRectangle> rects;
        int rectCount;
        gdk_region_get_rectangles(event->region, &rects.outPtr(), &rectCount);

        // Avoid recursing into the render tree excessively
        bool coalesce = shouldCoalesce(event->area, rects.get(), rectCount);

        if (coalesce) {
            IntRect rect = event->area;
            ctx.clip(rect);
            if (priv->transparent)
                ctx.clearRect(rect);
            frame->view()->paint(&ctx, rect);
        } else {
            for (int i = 0; i < rectCount; i++) {
                IntRect rect = rects.get()[i];
                ctx.save();
                ctx.clip(rect);
                if (priv->transparent)
                    ctx.clearRect(rect);
                frame->view()->paint(&ctx, rect);
                ctx.restore();
            }
        }
    }

    return FALSE;
}

static gboolean webkit_web_view_key_press_event(GtkWidget* widget, GdkEventKey* event)
{
    WebKitWebView* webView = WEBKIT_WEB_VIEW(widget);

    Frame* frame = core(webView)->focusController()->focusedOrMainFrame();
    PlatformKeyboardEvent keyboardEvent(event);

    if (!frame->view())
        return FALSE;

    if (frame->eventHandler()->keyEvent(keyboardEvent))
        return TRUE;

    FrameView* view = frame->view();
    SelectionController::EAlteration alteration;
    if (event->state & GDK_SHIFT_MASK)
        alteration = SelectionController::EXTEND;
    else
        alteration = SelectionController::MOVE;

    // TODO: We probably want to use GTK+ key bindings here and perhaps take an
    // approach more like the Win and Mac ports for key handling.
    switch (event->keyval) {
    case GDK_Down:
        view->scrollBy(IntSize(0, cScrollbarPixelsPerLineStep));
        return TRUE;
    case GDK_Up:
        view->scrollBy(IntSize(0, -cScrollbarPixelsPerLineStep));
        return TRUE;
    case GDK_Right:
        view->scrollBy(IntSize(cScrollbarPixelsPerLineStep, 0));
        return TRUE;
    case GDK_Left:
        view->scrollBy(IntSize(-cScrollbarPixelsPerLineStep, 0));
        return TRUE;
    case GDK_Home:
        frame->selection()->modify(alteration, SelectionController::BACKWARD, DocumentBoundary, true);
        return TRUE;
    case GDK_End:
        frame->selection()->modify(alteration, SelectionController::FORWARD, DocumentBoundary, true);
        return TRUE;
    }

    /* Chain up to our parent class for binding activation */
    return GTK_WIDGET_CLASS(webkit_web_view_parent_class)->key_press_event(widget, event);
}

static gboolean webkit_web_view_key_release_event(GtkWidget* widget, GdkEventKey* event)
{
    WebKitWebView* webView = WEBKIT_WEB_VIEW(widget);

    Frame* frame = core(webView)->focusController()->focusedOrMainFrame();
    if (!frame->view())
        return FALSE;

    PlatformKeyboardEvent keyboardEvent(event);

    if (frame->eventHandler()->keyEvent(keyboardEvent))
        return TRUE;

    /* Chain up to our parent class for binding activation */
    return GTK_WIDGET_CLASS(webkit_web_view_parent_class)->key_release_event(widget, event);
}

static gboolean webkit_web_view_button_press_event(GtkWidget* widget, GdkEventButton* event)
{
    WebKitWebView* webView = WEBKIT_WEB_VIEW(widget);

    // FIXME: need to keep track of subframe focus for key events
    gtk_widget_grab_focus(widget);

    if (event->button == 3)
        return webkit_web_view_forward_context_menu_event(webView, PlatformMouseEvent(event));

    Frame* frame = core(webView)->mainFrame();
    if (!frame->view())
        return FALSE;

    return frame->eventHandler()->handleMousePressEvent(PlatformMouseEvent(event));
}

static gboolean webkit_web_view_button_release_event(GtkWidget* widget, GdkEventButton* event)
{
    WebKitWebView* webView = WEBKIT_WEB_VIEW(widget);

    Frame* focusedFrame = core(webView)->focusController()->focusedFrame();

    if (focusedFrame && focusedFrame->editor()->canEdit()) {
#ifdef MAEMO_CHANGES
        WebKitWebViewPrivate* priv = webView->priv;
        hildon_gtk_im_context_filter_event(priv->imContext, (GdkEvent*)event);
#endif
    }

    Frame* mainFrame = core(webView)->mainFrame();
    if (mainFrame->view())
        mainFrame->eventHandler()->handleMouseReleaseEvent(PlatformMouseEvent(event));

    /* We always return FALSE here because WebKit can, for the same click, decide
     * to not handle press-event but handle release-event, which can totally confuse
     * some GTK+ containers when there are no other events in between. This way we
     * guarantee that this case never happens, and that if press-event goes through
     * release-event also goes through.
     */

    return FALSE;
}

static gboolean webkit_web_view_motion_event(GtkWidget* widget, GdkEventMotion* event)
{
    WebKitWebView* webView = WEBKIT_WEB_VIEW(widget);

    Frame* frame = core(webView)->mainFrame();
    if (!frame->view())
        return FALSE;

    return frame->eventHandler()->mouseMoved(PlatformMouseEvent(event));
}

static gboolean webkit_web_view_scroll_event(GtkWidget* widget, GdkEventScroll* event)
{
    WebKitWebView* webView = WEBKIT_WEB_VIEW(widget);

    Frame* frame = core(webView)->mainFrame();
    if (!frame->view())
        return FALSE;

    PlatformWheelEvent wheelEvent(event);
    return frame->eventHandler()->handleWheelEvent(wheelEvent);
}

static void webkit_web_view_size_allocate(GtkWidget* widget, GtkAllocation* allocation)
{
    GTK_WIDGET_CLASS(webkit_web_view_parent_class)->size_allocate(widget,allocation);

    WebKitWebView* webView = WEBKIT_WEB_VIEW(widget);

    Frame* frame = core(webView)->mainFrame();
    if (!frame->view())
        return;

    frame->view()->resize(allocation->width, allocation->height);
    frame->view()->forceLayout();
    frame->view()->adjustViewSize();
}

static gboolean webkit_web_view_focus_in_event(GtkWidget* widget, GdkEventFocus* event)
{
    // TODO: Improve focus handling as suggested in
    // http://bugs.webkit.org/show_bug.cgi?id=16910
    GtkWidget* toplevel = gtk_widget_get_toplevel(widget);
    if (GTK_WIDGET_TOPLEVEL(toplevel) && gtk_window_has_toplevel_focus(GTK_WINDOW(toplevel))) {
        WebKitWebView* webView = WEBKIT_WEB_VIEW(widget);

        Frame* frame = core(webView)->mainFrame();
        core(webView)->focusController()->setActive(frame);
    }
    return GTK_WIDGET_CLASS(webkit_web_view_parent_class)->focus_in_event(widget, event);
}

static gboolean webkit_web_view_focus_out_event(GtkWidget* widget, GdkEventFocus* event)
{
    WebKitWebView* webView = WEBKIT_WEB_VIEW(widget);

    core(webView)->focusController()->setActive(false);

    return GTK_WIDGET_CLASS(webkit_web_view_parent_class)->focus_out_event(widget, event);
}

static void webkit_web_view_realize(GtkWidget* widget)
{
    GTK_WIDGET_SET_FLAGS(widget, GTK_REALIZED);

    GdkWindowAttr attributes;
    attributes.window_type = GDK_WINDOW_CHILD;
    attributes.x = widget->allocation.x;
    attributes.y = widget->allocation.y;
    attributes.width = widget->allocation.width;
    attributes.height = widget->allocation.height;
    attributes.wclass = GDK_INPUT_OUTPUT;
    attributes.visual = gtk_widget_get_visual (widget);
    attributes.colormap = gtk_widget_get_colormap (widget);
    attributes.event_mask = GDK_VISIBILITY_NOTIFY_MASK
                            | GDK_EXPOSURE_MASK
                            | GDK_BUTTON_PRESS_MASK
                            | GDK_BUTTON_RELEASE_MASK
                            | GDK_POINTER_MOTION_MASK
                            | GDK_KEY_PRESS_MASK
                            | GDK_KEY_RELEASE_MASK
                            | GDK_BUTTON_MOTION_MASK
                            | GDK_BUTTON1_MOTION_MASK
                            | GDK_BUTTON2_MOTION_MASK
                            | GDK_BUTTON3_MOTION_MASK;

    gint attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP;
    widget->window = gdk_window_new(gtk_widget_get_parent_window (widget), &attributes, attributes_mask);
    gdk_window_set_user_data(widget->window, widget);

    widget->style = gtk_style_attach(widget->style, widget->window);
    gdk_window_set_background(widget->window, &widget->style->base[GTK_WIDGET_STATE(widget)]);

    WebKitWebView* webView = WEBKIT_WEB_VIEW(widget);
    WebKitWebViewPrivate* priv = webView->priv;
    gtk_im_context_set_client_window(priv->imContext, widget->window);
}

static void webkit_web_view_set_scroll_adjustments(WebKitWebView* webView, GtkAdjustment* hadj, GtkAdjustment* vadj)
{
    if (!core(webView))
        return;

    FrameView* view = core(webkit_web_view_get_main_frame(webView))->view();

    if (hadj)
        g_object_ref(hadj);
    if (vadj)
        g_object_ref(vadj);

    WebKitWebViewPrivate* priv = webView->priv;

    if (priv->horizontalAdjustment)
        g_object_unref(priv->horizontalAdjustment);
    if (priv->verticalAdjustment)
        g_object_unref(priv->verticalAdjustment);

    priv->horizontalAdjustment = hadj;
    priv->verticalAdjustment = vadj;

    if (!view)
        return;

    view->setGtkAdjustments(hadj, vadj);
}

static void webkit_web_view_container_add(GtkContainer* container, GtkWidget* widget)
{
    WebKitWebView* webView = WEBKIT_WEB_VIEW(container);
    WebKitWebViewPrivate* priv = webView->priv;

    priv->children.add(widget);
    if (GTK_WIDGET_REALIZED(container))
        gtk_widget_set_parent_window(widget, GTK_WIDGET(webView)->window);
    gtk_widget_set_parent(widget, GTK_WIDGET(container));
}

static void webkit_web_view_container_remove(GtkContainer* container, GtkWidget* widget)
{
    WebKitWebView* webView = WEBKIT_WEB_VIEW(container);
    WebKitWebViewPrivate* priv = webView->priv;

    if (priv->children.contains(widget)) {
        gtk_widget_unparent(widget);
        priv->children.remove(widget);
    }
}

static void webkit_web_view_container_forall(GtkContainer* container, gboolean, GtkCallback callback, gpointer callbackData)
{
    WebKitWebView* webView = WEBKIT_WEB_VIEW(container);
    WebKitWebViewPrivate* priv = webView->priv;

    HashSet<GtkWidget*> children = priv->children;
    HashSet<GtkWidget*>::const_iterator end = children.end();
    for (HashSet<GtkWidget*>::const_iterator current = children.begin(); current != end; ++current)
        (*callback)(*current, callbackData);
}

static WebKitWebView* webkit_web_view_real_create_web_view(WebKitWebView*, WebKitWebFrame*)
{
    return 0;
}

static gboolean webkit_web_view_real_web_view_ready(WebKitWebView*)