gtkcols.c

大名鼎鼎的远程登录软件putty的Symbian版源码

/*
 * gtkcols.c - implementation of the `Columns' GTK layout container.
 */

#include "gtkcols.h"

static void columns_init(Columns *cols);
static void columns_class_init(ColumnsClass *klass);
static void columns_map(GtkWidget *widget);
static void columns_unmap(GtkWidget *widget);
static void columns_draw(GtkWidget *widget, GdkRectangle *area);
static gint columns_expose(GtkWidget *widget, GdkEventExpose *event);
static void columns_base_add(GtkContainer *container, GtkWidget *widget);
static void columns_remove(GtkContainer *container, GtkWidget *widget);
static void columns_forall(GtkContainer *container, gboolean include_internals,
                           GtkCallback callback, gpointer callback_data);
static gint columns_focus(GtkContainer *container, GtkDirectionType dir);
static GtkType columns_child_type(GtkContainer *container);
static void columns_size_request(GtkWidget *widget, GtkRequisition *req);
static void columns_size_allocate(GtkWidget *widget, GtkAllocation *alloc);

static GtkContainerClass *parent_class = NULL;

GtkType columns_get_type(void)
{
    static GtkType columns_type = 0;

    if (!columns_type) {
        static const GtkTypeInfo columns_info = {
            "Columns",
            sizeof(Columns),
            sizeof(ColumnsClass),
            (GtkClassInitFunc) columns_class_init,
            (GtkObjectInitFunc) columns_init,
            /* reserved_1 */ NULL,
            /* reserved_2 */ NULL,
            (GtkClassInitFunc) NULL,
        };

        columns_type = gtk_type_unique(GTK_TYPE_CONTAINER, &columns_info);
    }

    return columns_type;
}

static gint (*columns_inherited_focus)(GtkContainer *container,
				       GtkDirectionType direction);

static void columns_class_init(ColumnsClass *klass)
{
    GtkObjectClass *object_class;
    GtkWidgetClass *widget_class;
    GtkContainerClass *container_class;

    object_class = (GtkObjectClass *)klass;
    widget_class = (GtkWidgetClass *)klass;
    container_class = (GtkContainerClass *)klass;

    parent_class = gtk_type_class(GTK_TYPE_CONTAINER);

    /*
     * FIXME: do we have to do all this faffing with set_arg,
     * get_arg and child_arg_type? Ick.
     */

    widget_class->map = columns_map;
    widget_class->unmap = columns_unmap;
    widget_class->draw = columns_draw;
    widget_class->expose_event = columns_expose;
    widget_class->size_request = columns_size_request;
    widget_class->size_allocate = columns_size_allocate;

    container_class->add = columns_base_add;
    container_class->remove = columns_remove;
    container_class->forall = columns_forall;
    container_class->child_type = columns_child_type;
    /* Save the previous value of this method. */
    if (!columns_inherited_focus)
	columns_inherited_focus = container_class->focus;
    container_class->focus = columns_focus;
}

static void columns_init(Columns *cols)
{
    GTK_WIDGET_SET_FLAGS(cols, GTK_NO_WINDOW);

    cols->children = NULL;
    cols->spacing = 0;
}

/*
 * These appear to be thoroughly tedious functions; the only reason
 * we have to reimplement them at all is because we defined our own
 * format for our GList of children...
 */
static void columns_map(GtkWidget *widget)
{
    Columns *cols;
    ColumnsChild *child;
    GList *children;

    g_return_if_fail(widget != NULL);
    g_return_if_fail(IS_COLUMNS(widget));

    cols = COLUMNS(widget);
    GTK_WIDGET_SET_FLAGS(cols, GTK_MAPPED);

    for (children = cols->children;
         children && (child = children->data);
         children = children->next) {
        if (child->widget &&
	    GTK_WIDGET_VISIBLE(child->widget) &&
            !GTK_WIDGET_MAPPED(child->widget))
            gtk_widget_map(child->widget);
    }
}
static void columns_unmap(GtkWidget *widget)
{
    Columns *cols;
    ColumnsChild *child;
    GList *children;

    g_return_if_fail(widget != NULL);
    g_return_if_fail(IS_COLUMNS(widget));

    cols = COLUMNS(widget);
    GTK_WIDGET_UNSET_FLAGS(cols, GTK_MAPPED);

    for (children = cols->children;
         children && (child = children->data);
         children = children->next) {
        if (child->widget &&
	    GTK_WIDGET_VISIBLE(child->widget) &&
            GTK_WIDGET_MAPPED(child->widget))
            gtk_widget_unmap(child->widget);
    }
}
static void columns_draw(GtkWidget *widget, GdkRectangle *area)
{
    Columns *cols;
    ColumnsChild *child;
    GList *children;
    GdkRectangle child_area;

    g_return_if_fail(widget != NULL);
    g_return_if_fail(IS_COLUMNS(widget));

    if (GTK_WIDGET_DRAWABLE(widget)) {
        cols = COLUMNS(widget);

        for (children = cols->children;
             children && (child = children->data);
             children = children->next) {
            if (child->widget &&
		GTK_WIDGET_DRAWABLE(child->widget) &&
                gtk_widget_intersect(child->widget, area, &child_area))
                gtk_widget_draw(child->widget, &child_area);
        }
    }
}
static gint columns_expose(GtkWidget *widget, GdkEventExpose *event)
{
    Columns *cols;
    ColumnsChild *child;
    GList *children;
    GdkEventExpose child_event;

    g_return_val_if_fail(widget != NULL, FALSE);
    g_return_val_if_fail(IS_COLUMNS(widget), FALSE);
    g_return_val_if_fail(event != NULL, FALSE);

    if (GTK_WIDGET_DRAWABLE(widget)) {
        cols = COLUMNS(widget);
        child_event = *event;

        for (children = cols->children;
             children && (child = children->data);
             children = children->next) {
            if (child->widget &&
		GTK_WIDGET_DRAWABLE(child->widget) &&
                GTK_WIDGET_NO_WINDOW(child->widget) &&
                gtk_widget_intersect(child->widget, &event->area,
                                     &child_event.area))
                gtk_widget_event(child->widget, (GdkEvent *)&child_event);
        }
    }
    return FALSE;
}

static void columns_base_add(GtkContainer *container, GtkWidget *widget)
{
    Columns *cols;

    g_return_if_fail(container != NULL);
    g_return_if_fail(IS_COLUMNS(container));
    g_return_if_fail(widget != NULL);

    cols = COLUMNS(container);

    /*
     * Default is to add a new widget spanning all columns.
     */
    columns_add(cols, widget, 0, 0);   /* 0 means ncols */
}

static void columns_remove(GtkContainer *container, GtkWidget *widget)
{
    Columns *cols;
    ColumnsChild *child;
    GtkWidget *childw;
    GList *children;
    gboolean was_visible;

    g_return_if_fail(container != NULL);
    g_return_if_fail(IS_COLUMNS(container));
    g_return_if_fail(widget != NULL);

    cols = COLUMNS(container);

    for (children = cols->children;
         children && (child = children->data);
         children = children->next) {
        if (child->widget != widget)
            continue;

        was_visible = GTK_WIDGET_VISIBLE(widget);
        gtk_widget_unparent(widget);
        cols->children = g_list_remove_link(cols->children, children);
        g_list_free(children);
        g_free(child);
        if (was_visible)
            gtk_widget_queue_resize(GTK_WIDGET(container));
        break;
    }

    for (children = cols->taborder;
         children && (childw = children->data);
         children = children->next) {
        if (childw != widget)
            continue;

        cols->taborder = g_list_remove_link(cols->taborder, children);
        g_list_free(children);
        break;
    }
}

static void columns_forall(GtkContainer *container, gboolean include_internals,
                           GtkCallback callback, gpointer callback_data)
{
    Columns *cols;
    ColumnsChild *child;
    GList *children, *next;

    g_return_if_fail(container != NULL);
    g_return_if_fail(IS_COLUMNS(container));
    g_return_if_fail(callback != NULL);

    cols = COLUMNS(container);

    for (children = cols->children;
         children && (child = children->data);
         children = next) {
        /*
         * We can't wait until after the callback to assign
         * `children = children->next', because the callback might
         * be gtk_widget_destroy, which would remove the link
         * `children' from the list! So instead we must get our
         * hands on the value of the `next' pointer _before_ the
         * callback.
         */
        next = children->next;
	if (child->widget)
	    callback(child->widget, callback_data);
    }
}

static GtkType columns_child_type(GtkContainer *container)
{
    return GTK_TYPE_WIDGET;
}

GtkWidget *columns_new(gint spacing)
{
    Columns *cols;

    cols = gtk_type_new(columns_get_type());
    cols->spacing = spacing;

    return GTK_WIDGET(cols);
}

void columns_set_cols(Columns *cols, gint ncols, const gint *percentages)
{
    ColumnsChild *childdata;
    gint i;

    g_return_if_fail(cols != NULL);
    g_return_if_fail(IS_COLUMNS(cols));
    g_return_if_fail(ncols > 0);
    g_return_if_fail(percentages != NULL);

    childdata = g_new(ColumnsChild, 1);
    childdata->widget = NULL;
    childdata->ncols = ncols;
    childdata->percentages = g_new(gint, ncols);
    childdata->force_left = FALSE;
    for (i = 0; i < ncols; i++)
        childdata->percentages[i] = percentages[i];

    cols->children = g_list_append(cols->children, childdata);
}

void columns_add(Columns *cols, GtkWidget *child,
                 gint colstart, gint colspan)
{
    ColumnsChild *childdata;

    g_return_if_fail(cols != NULL);
    g_return_if_fail(IS_COLUMNS(cols));
    g_return_if_fail(child != NULL);
    g_return_if_fail(child->parent == NULL);

    childdata = g_new(ColumnsChild, 1);
    childdata->widget = child;
    childdata->colstart = colstart;
    childdata->colspan = colspan;
    childdata->force_left = FALSE;

    cols->children = g_list_append(cols->children, childdata);
    cols->taborder = g_list_append(cols->taborder, child);

    gtk_widget_set_parent(child, GTK_WIDGET(cols));

    if (GTK_WIDGET_REALIZED(cols))
        gtk_widget_realize(child);

    if (GTK_WIDGET_VISIBLE(cols) && GTK_WIDGET_VISIBLE(child)) {
        if (GTK_WIDGET_MAPPED(cols))
            gtk_widget_map(child);
        gtk_widget_queue_resize(child);
    }
}

void columns_force_left_align(Columns *cols, GtkWidget *widget)
{
    ColumnsChild *child;
    GList *children;