ui_tree_edit.c

Gqview,Linux下基于GTK+库写成的轻量级而能丰富的图像浏览程序。

}

gint tree_view_row_get_visibility(GtkTreeView *widget, GtkTreeIter *iter, gint fully_visible)
{
	GtkTreeModel *store;
	GtkTreePath *tpath;	
	gint cx, cy;
                                                                                                                               
	GdkRectangle vrect;
	GdkRectangle crect;

	if (!GTK_WIDGET_REALIZED(GTK_WIDGET(widget))) return 0;

	store = gtk_tree_view_get_model(widget);
	tpath = gtk_tree_model_get_path(store, iter);

	gtk_tree_view_get_visible_rect(widget, &vrect);
	gtk_tree_view_get_cell_area(widget, tpath, NULL, &crect);
	gtk_tree_path_free(tpath);

	gtk_tree_view_widget_to_tree_coords(widget, crect.x, crect.y, &cx, &cy);

	if (fully_visible)
		{
		if (cy < vrect.y) return -1;
		if (cy + crect.height > vrect.y + vrect.height) return 1;
		return 0;
		}

	if (cy + crect.height < vrect.y) return -1;
	if (cy > vrect.y + vrect.height) return 1;
	return 0;
}

gint tree_view_row_make_visible(GtkTreeView *widget, GtkTreeIter *iter, gint center)
{
	GtkTreePath *tpath;
	gint vis;

	vis = tree_view_row_get_visibility(widget, iter, TRUE);

	tpath = gtk_tree_model_get_path(gtk_tree_view_get_model(widget), iter);
	if (center && vis != 0)
		{
		gtk_tree_view_scroll_to_cell(widget, tpath, NULL, TRUE, 0.5, 0.0);
		}
	else if (vis < 0)
		{
		gtk_tree_view_scroll_to_cell(widget, tpath, NULL, TRUE, 0.0, 0.0);
		}
	else if (vis > 0)
		{
		gtk_tree_view_scroll_to_cell(widget, tpath, NULL, TRUE, 1.0, 0.0);
		}
	gtk_tree_path_free(tpath);

	return vis;
}

gint tree_view_move_cursor_away(GtkTreeView *widget, GtkTreeIter *iter, gint only_selected)
{
	GtkTreeModel *store;
	GtkTreePath *tpath;
	GtkTreePath *fpath;
	gint move = FALSE;

	if (!iter) return FALSE;

	store = gtk_tree_view_get_model(widget);
	tpath = gtk_tree_model_get_path(store, iter);
	gtk_tree_view_get_cursor(widget, &fpath, NULL);

	if (fpath && gtk_tree_path_compare(tpath, fpath) == 0)
		{
		GtkTreeSelection *selection;

		selection = gtk_tree_view_get_selection(widget);

		if (!only_selected ||
		    gtk_tree_selection_path_is_selected(selection, tpath))
			{
			GtkTreeIter current;

			current = *iter;
			if (gtk_tree_model_iter_next(store, &current))
				{
				gtk_tree_path_next(tpath);
				move = TRUE;
				}
			else if (gtk_tree_path_prev(tpath) &&
				 gtk_tree_model_get_iter(store, &current, tpath))
				{
				move = TRUE;
				}

			if (move)
				{
				gtk_tree_view_set_cursor(widget, tpath, NULL, FALSE);
				}
			}
		}

	gtk_tree_path_free(tpath);
	if (fpath) gtk_tree_path_free(fpath);

	return move;
}

gint tree_path_to_row(GtkTreePath *tpath)
{
	gint *indices;
                                                                                                                    
	indices = gtk_tree_path_get_indices(tpath);
	if (indices) return indices[0];
                                                                                                                    
	return -1;
}


/*
 *-------------------------------------------------------------------
 * color utilities
 *-------------------------------------------------------------------
 */

void shift_color(GdkColor *src, gshort val, gint direction)
{
	gshort cs;

	if (val == -1)
		{
		val = STYLE_SHIFT_STANDARD;
		}
	else
		{
		val = CLAMP(val, 1, 100);
		}
	cs = 0xffff / 100 * val;

	/* up or down ? */
	if (direction < 0 ||
	    (direction == 0 &&((gint)src->red + (gint)src->green + (gint)src->blue) / 3 > 0xffff / 2))
		{
		src->red = MAX(0 , src->red - cs);
		src->green = MAX(0 , src->green - cs);
		src->blue = MAX(0 , src->blue - cs);
		}
	else
		{
		src->red = MIN(0xffff, src->red + cs);
		src->green = MIN(0xffff, src->green + cs);
		src->blue = MIN(0xffff, src->blue + cs);
		}
}

/* darkens or lightens a style's color for given state
 * esp. useful for alternating dark/light in (c)lists
 */
void style_shift_color(GtkStyle *style, GtkStateType type, gshort shift_value, gint direction)
{
	if (!style) return;

	shift_color(&style->base[type], shift_value, direction);
	shift_color(&style->bg[type], shift_value, direction);
}

/*
 *-------------------------------------------------------------------
 * auto scroll by mouse position
 *-------------------------------------------------------------------
 */

#define AUTO_SCROLL_DEFAULT_SPEED 100
#define AUTO_SCROLL_DEFAULT_REGION 20

typedef struct _AutoScrollData AutoScrollData;
struct _AutoScrollData
{
	gint timer_id;
	gint region_size;
	GtkWidget *widget;
	GtkAdjustment *adj;
	gint max_step;

	gint (*notify_func)(GtkWidget *, gint, gint, gpointer);
	gpointer notify_data;
};

void widget_auto_scroll_stop(GtkWidget *widget)
{
	AutoScrollData *sd;

	sd = g_object_get_data(G_OBJECT(widget), "autoscroll");
	if (!sd) return;
	g_object_set_data(G_OBJECT(widget), "autoscroll", NULL);

	if (sd->timer_id != -1) g_source_remove(sd->timer_id);
	g_free(sd);
}

static gint widget_auto_scroll_cb(gpointer data)
{
	AutoScrollData *sd = data;
	GdkWindow *window;
	gint x, y;
	gint w, h;
	gint amt = 0;

	if (sd->max_step < sd->region_size)
		{
		sd->max_step = MIN(sd->region_size, sd->max_step + 2);
		}

	window = sd->widget->window;
	gdk_window_get_pointer(window, &x, &y, NULL);
	gdk_drawable_get_size(window, &w, &h);

	if (x < 0 || x >= w || y < 0 || y >= h)
		{
		sd->timer_id = -1;
		widget_auto_scroll_stop(sd->widget);
		return FALSE;
		}

	if (h < sd->region_size * 3)
		{
		/* height is cramped, nicely divide into three equal regions */
		if (y < h / 3 || y > h / 3 * 2)
			{
			amt = (y < h / 2) ? 0 - ((h / 2) - y) : y - (h / 2);
			}
		}
	else if (y < sd->region_size)
		{
		amt = 0 - (sd->region_size - y);
		}
	else if (y >= h - sd->region_size)
		{
		amt = y - (h - sd->region_size);
		}

	if (amt != 0)
		{
		amt = CLAMP(amt, 0 - sd->max_step, sd->max_step);

		if (sd->adj->value != CLAMP(sd->adj->value + amt, sd->adj->lower, sd->adj->upper - sd->adj->page_size))
			{
			/* only notify when scrolling is needed */
			if (sd->notify_func && !sd->notify_func(sd->widget, x, y, sd->notify_data))
				{
				sd->timer_id = -1;
				widget_auto_scroll_stop(sd->widget);
				return FALSE;
				}

			gtk_adjustment_set_value(sd->adj,
				CLAMP(sd->adj->value + amt, sd->adj->lower, sd->adj->upper - sd->adj->page_size));
			}
		}

	return TRUE;
}

gint widget_auto_scroll_start(GtkWidget *widget, GtkAdjustment *v_adj, gint scroll_speed, gint region_size,
			      gint (*notify_func)(GtkWidget *widget, gint x, gint y, gpointer data), gpointer notify_data)
{
	AutoScrollData *sd;

	if (!widget || !v_adj) return 0;
	if (g_object_get_data(G_OBJECT(widget), "autoscroll")) return 0;
	if (scroll_speed < 1) scroll_speed = AUTO_SCROLL_DEFAULT_SPEED;
	if (region_size < 1) region_size = AUTO_SCROLL_DEFAULT_REGION;

	sd = g_new0(AutoScrollData, 1);
	sd->widget = widget;
	sd->adj = v_adj;
	sd->region_size = region_size;
	sd->max_step = 1;
	sd->timer_id = g_timeout_add(scroll_speed, widget_auto_scroll_cb, sd);

	sd->notify_func = notify_func;
	sd->notify_data = notify_data;

	g_object_set_data(G_OBJECT(widget), "autoscroll", sd);

	return scroll_speed;
}


/*
 *-------------------------------------------------------------------
 * GList utils
 *-------------------------------------------------------------------
 */

GList *uig_list_insert_link(GList *list, GList *link, gpointer data)
{
	GList *new_list;

	if (!list || link == list) return g_list_prepend(list, data);
	if (!link) return g_list_append(list, data);

	new_list = g_list_alloc ();
	new_list->data = data;

	if (link->prev)
		{
		link->prev->next = new_list;
		new_list->prev = link->prev;
		}
	else
		{
		list = new_list;
		}
	link->prev = new_list;
	new_list->next = link;

	return list;
}

GList *uig_list_insert_list(GList *parent, GList *insert_link, GList *list)
{
	GList *end;

	if (!insert_link) return g_list_concat(parent, list);
	if (insert_link == parent) return g_list_concat(list, parent);
	if (!parent) return list;
	if (!list) return parent;

	end  = g_list_last(list);

	if (insert_link->prev) insert_link->prev->next = list;
	list->prev = insert_link->prev;
	insert_link->prev = end;
	end->next = insert_link;

	return parent;
}