gtk2drawing.c

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

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/* We need to have pointers to the inner widgets (entry, button, arrow) of
 * the ComboBoxEntry to get the correct rendering from theme engines which
 * special cases their look. Since the inner layout can change, we ask GTK
 * to NULL our pointers when they are about to become invalid because the
 * corresponding widgets don't exist anymore. It's the role of
 * g_object_add_weak_pointer().
 * Note that if we don't find the inner widgets (which shouldn't happen), we
 * fallback to use generic "non-inner" widgets, and they don't need that kind
 * of weak pointer since they are explicit children of gProtoWindow and as
 * such GTK holds a strong reference to them. */
static void
moz_gtk_get_combo_box_entry_inner_widgets(GtkWidget *widget,
                                          gpointer client_data)
{
    if (GTK_IS_TOGGLE_BUTTON(widget)) {
        gComboBoxEntryButtonWidget = widget;
        g_object_add_weak_pointer(G_OBJECT(widget),
                                  (gpointer) &gComboBoxEntryButtonWidget);
    } else if (GTK_IS_ENTRY(widget)) {
        gComboBoxEntryTextareaWidget = widget;
        g_object_add_weak_pointer(G_OBJECT(widget),
                                  (gpointer) &gComboBoxEntryTextareaWidget);
    } else
        return;
    gtk_widget_realize(widget);
    g_object_set_data(G_OBJECT(widget), "transparent-bg-hint", GINT_TO_POINTER(TRUE));
}

static void
moz_gtk_get_combo_box_entry_arrow(GtkWidget *widget, gpointer client_data)
{
    if (GTK_IS_ARROW(widget)) {
        gComboBoxEntryArrowWidget = widget;
        g_object_add_weak_pointer(G_OBJECT(widget),
                                  (gpointer) &gComboBoxEntryArrowWidget);
        gtk_widget_realize(widget);
        g_object_set_data(G_OBJECT(widget), "transparent-bg-hint",
                          GINT_TO_POINTER(TRUE));
    }
}

static gint
ensure_combo_box_entry_widgets()
{
    GtkWidget* buttonChild;

    if (gComboBoxEntryTextareaWidget &&
            gComboBoxEntryButtonWidget &&
            gComboBoxEntryArrowWidget)
        return MOZ_GTK_SUCCESS;

    /* Create a ComboBoxEntry if needed */
    if (!gComboBoxEntryWidget) {
        gComboBoxEntryWidget = gtk_combo_box_entry_new();
        setup_widget_prototype(gComboBoxEntryWidget);
    }

    /* Get its inner Entry and Button */
    gtk_container_forall(GTK_CONTAINER(gComboBoxEntryWidget),
                         moz_gtk_get_combo_box_entry_inner_widgets,
                         NULL);

    if (!gComboBoxEntryTextareaWidget) {
        ensure_entry_widget();
        gComboBoxEntryTextareaWidget = gEntryWidget;
    }

    if (gComboBoxEntryButtonWidget) {
        /* Get the Arrow inside the Button */
        buttonChild = GTK_BIN(gComboBoxEntryButtonWidget)->child;
        if (GTK_IS_HBOX(buttonChild)) {
            /* appears-as-list = FALSE, cell-view = TRUE; the button
             * contains an hbox. This hbox is there because ComboBoxEntry
             * inherits from ComboBox which needs to place a cell renderer,
             * a separator, and an arrow in the button when appears-as-list
             * is FALSE. Here the hbox should only contain an arrow, since
             * a ComboBoxEntry doesn't need all those widgets in the
             * button. */
            gtk_container_forall(GTK_CONTAINER(buttonChild),
                                 moz_gtk_get_combo_box_entry_arrow,
                                 NULL);
        } else if(GTK_IS_ARROW(buttonChild)) {
            /* appears-as-list = TRUE, or cell-view = FALSE;
             * the button only contains an arrow */
            gComboBoxEntryArrowWidget = buttonChild;
            g_object_add_weak_pointer(G_OBJECT(buttonChild), (gpointer)
                                      &gComboBoxEntryArrowWidget);
            gtk_widget_realize(gComboBoxEntryArrowWidget);
            g_object_set_data(G_OBJECT(gComboBoxEntryArrowWidget),
                              "transparent-bg-hint", GINT_TO_POINTER(TRUE));
        }
    } else {
        /* Shouldn't be reached with current internal gtk implementation;
         * we use a generic toggle button as last resort fallback to avoid
         * crashing. */
        ensure_toggle_button_widget();
        gComboBoxEntryButtonWidget = gToggleButtonWidget;
    }

    if (!gComboBoxEntryArrowWidget) {
        /* Shouldn't be reached with current internal gtk implementation;
         * we gButtonArrowWidget as last resort fallback to avoid
         * crashing. */
        ensure_button_arrow_widget();
        gComboBoxEntryArrowWidget = gButtonArrowWidget;
    }

    return MOZ_GTK_SUCCESS;
}


static gint
ensure_handlebox_widget()
{
    if (!gHandleBoxWidget) {
        gHandleBoxWidget = gtk_handle_box_new();
        setup_widget_prototype(gHandleBoxWidget);
    }
    return MOZ_GTK_SUCCESS;
}

static gint
ensure_toolbar_widget()
{
    if (!gToolbarWidget) {
        ensure_handlebox_widget();
        gToolbarWidget = gtk_toolbar_new();
        gtk_container_add(GTK_CONTAINER(gHandleBoxWidget), gToolbarWidget);
        gtk_widget_realize(gToolbarWidget);
        g_object_set_data(G_OBJECT(gToolbarWidget), "transparent-bg-hint",
                          GINT_TO_POINTER(TRUE));
    }
    return MOZ_GTK_SUCCESS;
}

static gint
ensure_toolbar_separator_widget()
{
    if (!gToolbarSeparatorWidget) {
        ensure_toolbar_widget();
        gToolbarSeparatorWidget = GTK_WIDGET(gtk_separator_tool_item_new());
        setup_widget_prototype(gToolbarSeparatorWidget);
    }
    return MOZ_GTK_SUCCESS;
}

static gint
ensure_tooltip_widget()
{
    if (!gTooltipWidget) {
        gTooltipWidget = gtk_window_new(GTK_WINDOW_POPUP);
        gtk_widget_realize(gTooltipWidget);
        moz_gtk_set_widget_name(gTooltipWidget);
    }
    return MOZ_GTK_SUCCESS;
}

static gint
ensure_tab_widget()
{
    if (!gTabWidget) {
        gTabWidget = gtk_notebook_new();
        setup_widget_prototype(gTabWidget);
    }
    return MOZ_GTK_SUCCESS;
}

static gint
ensure_progress_widget()
{
    if (!gProgressWidget) {
        gProgressWidget = gtk_progress_bar_new();
        setup_widget_prototype(gProgressWidget);
    }
    return MOZ_GTK_SUCCESS;
}

static gint
ensure_statusbar_widget()
{
    if (!gStatusbarWidget) {
      gStatusbarWidget = gtk_statusbar_new();
      setup_widget_prototype(gStatusbarWidget);
    }
    return MOZ_GTK_SUCCESS;
}

static gint
ensure_frame_widget()
{
    if (!gFrameWidget) {
        ensure_statusbar_widget();
        gFrameWidget = gtk_frame_new(NULL);
        gtk_container_add(GTK_CONTAINER(gStatusbarWidget), gFrameWidget);
        gtk_widget_realize(gFrameWidget);
    }
    return MOZ_GTK_SUCCESS;
}

static gint
ensure_menu_bar_widget()
{
    if (!gMenuBarWidget) {
        gMenuBarWidget = gtk_menu_bar_new();
        setup_widget_prototype(gMenuBarWidget);
    }
    return MOZ_GTK_SUCCESS;
}

static gint
ensure_menu_bar_item_widget()
{
    if (!gMenuBarItemWidget) {
        ensure_menu_bar_widget();
        gMenuBarItemWidget = gtk_menu_item_new();
        gtk_menu_shell_append(GTK_MENU_SHELL(gMenuBarWidget),
                              gMenuBarItemWidget);
        gtk_widget_realize(gMenuBarItemWidget);
        g_object_set_data(G_OBJECT(gMenuBarItemWidget),
                          "transparent-bg-hint", GINT_TO_POINTER(TRUE));
    }
    return MOZ_GTK_SUCCESS;
}

static gint
ensure_menu_popup_widget()
{
    if (!gMenuPopupWidget) {
        ensure_menu_bar_item_widget();
        gMenuPopupWidget = gtk_menu_new();
        gtk_menu_item_set_submenu(GTK_MENU_ITEM(gMenuBarItemWidget),
                                  gMenuPopupWidget);
        gtk_widget_realize(gMenuPopupWidget);
        g_object_set_data(G_OBJECT(gMenuPopupWidget),
                          "transparent-bg-hint", GINT_TO_POINTER(TRUE));
    }
    return MOZ_GTK_SUCCESS;
}

static gint
ensure_menu_item_widget()
{
    if (!gMenuItemWidget) {
        ensure_menu_popup_widget();
        gMenuItemWidget = gtk_menu_item_new_with_label("M");
        gtk_menu_shell_append(GTK_MENU_SHELL(gMenuPopupWidget),
                              gMenuItemWidget);
        gtk_widget_realize(gMenuItemWidget);
        g_object_set_data(G_OBJECT(gMenuItemWidget),
                          "transparent-bg-hint", GINT_TO_POINTER(TRUE));
    }
    return MOZ_GTK_SUCCESS;
}

static gint
ensure_image_menu_item_widget()
{
    if (!gImageMenuItemWidget) {
        ensure_menu_popup_widget();
        gImageMenuItemWidget = gtk_image_menu_item_new();
        gtk_menu_shell_append(GTK_MENU_SHELL(gMenuPopupWidget),
                              gImageMenuItemWidget);
        gtk_widget_realize(gImageMenuItemWidget);
        g_object_set_data(G_OBJECT(gImageMenuItemWidget),
                          "transparent-bg-hint", GINT_TO_POINTER(TRUE));
    }
    return MOZ_GTK_SUCCESS;
}

static gint
ensure_menu_separator_widget()
{
    if (!gMenuSeparatorWidget) {
        ensure_menu_popup_widget();
        gMenuSeparatorWidget = gtk_separator_menu_item_new();
        gtk_menu_shell_append(GTK_MENU_SHELL(gMenuPopupWidget),
                              gMenuSeparatorWidget);
        gtk_widget_realize(gMenuSeparatorWidget);
        g_object_set_data(G_OBJECT(gMenuSeparatorWidget),
                          "transparent-bg-hint", GINT_TO_POINTER(TRUE));
    }
    return MOZ_GTK_SUCCESS;
}

static gint
ensure_check_menu_item_widget()
{
    if (!gCheckMenuItemWidget) {
        ensure_menu_popup_widget();
        gCheckMenuItemWidget = gtk_check_menu_item_new_with_label("M");
        gtk_menu_shell_append(GTK_MENU_SHELL(gMenuPopupWidget),
                              gCheckMenuItemWidget);
        gtk_widget_realize(gCheckMenuItemWidget);
        g_object_set_data(G_OBJECT(gCheckMenuItemWidget),
                          "transparent-bg-hint", GINT_TO_POINTER(TRUE));
    }
    return MOZ_GTK_SUCCESS;
}

static gint
ensure_tree_view_widget()
{
    if (!gTreeViewWidget) {
        gTreeViewWidget = gtk_tree_view_new();
        setup_widget_prototype(gTreeViewWidget);
    }
    return MOZ_GTK_SUCCESS;
}

static gint
ensure_tree_header_cell_widget()
{
    if(!gTreeHeaderCellWidget) {
        /*
         * Some GTK engines paint the first and last cell
         * of a TreeView header with a highlight.
         * Since we do not know where our widget will be relative
         * to the other buttons in the TreeView header, we must
         * paint it as a button that is between two others,
         * thus ensuring it is neither the first or last button
         * in the header.
         * GTK doesn't give us a way to do this explicitly,
         * so we must paint with a button that is between two
         * others.
         */

        GtkTreeViewColumn* firstTreeViewColumn;
        GtkTreeViewColumn* lastTreeViewColumn;

        ensure_tree_view_widget();

        /* Create and append our three columns */
        firstTreeViewColumn = gtk_tree_view_column_new();
        gtk_tree_view_column_set_title(firstTreeViewColumn, "M");
        gtk_tree_view_append_column(GTK_TREE_VIEW(gTreeViewWidget), firstTreeViewColumn);

        gMiddleTreeViewColumn = gtk_tree_view_column_new();
        gtk_tree_view_column_set_title(GTK_TREE_VIEW_COLUMN(gMiddleTreeViewColumn), "M");
        gtk_tree_view_append_column(GTK_TREE_VIEW(gTreeViewWidget),
                                    GTK_TREE_VIEW_COLUMN(gMiddleTreeViewColumn));

        lastTreeViewColumn = gtk_tree_view_column_new();
        gtk_tree_view_column_set_title(lastTreeViewColumn, "M");
        gtk_tree_view_append_column(GTK_TREE_VIEW(gTreeViewWidget), lastTreeViewColumn);

        /* Use the middle column's header for our button */
        gTreeHeaderCellWidget = GTK_TREE_VIEW_COLUMN(gMiddleTreeViewColumn)->button;
        gTreeHeaderSortArrowWidget = GTK_TREE_VIEW_COLUMN(gMiddleTreeViewColumn)->arrow;
        g_object_set_data(G_OBJECT(gTreeHeaderCellWidget),
                          "transparent-bg-hint", GINT_TO_POINTER(TRUE));
        g_object_set_data(G_OBJECT(gTreeHeaderSortArrowWidget),
                          "transparent-bg-hint", GINT_TO_POINTER(TRUE));
    }
    return MOZ_GTK_SUCCESS;
}

static gint
ensure_expander_widget()
{
    if (!gExpanderWidget) {
        gExpanderWidget = gtk_expander_new("M");
        setup_widget_prototype(gExpanderWidget);
    }
    return MOZ_GTK_SUCCESS;
}

static gint
ensure_scrolled_window_widget()
{
    if (!gScrolledWindowWidget) {
        gScrolledWindowWidget = gtk_scrolled_window_new(NULL, NULL);