console/libgnt/gntmain.c

#include <panel.h>

#include "gnt.h"
#include "gntbox.h"
#include "gntkeys.h"
#include "gntcolors.h"
#include "gnttree.h"

#include <stdio.h>
#include <stdlib.h>
#include <locale.h>
#include <unistd.h>
#include <string.h>

static int lock_focus_list;
static GList *focus_list;

static int X_MIN;
static int X_MAX;
static int Y_MIN;
static int Y_MAX;

static gboolean ascii_only;

static GMainLoop *loop;
static struct
{
	GntWidget *window;
	GntWidget *tree;
} window_list;

typedef struct
{
	GntWidget *me;

	PANEL *panel;
} GntNode;

typedef enum
{
	GNT_KP_MODE_NORMAL,
	GNT_KP_MODE_RESIZE,
	GNT_KP_MODE_MOVE,
	GNT_KP_MODE_MENU,
	GNT_KP_MODE_WINDOW_LIST
} GntKeyPressMode;

static GHashTable *nodes;

static void free_node(gpointer data);
static void draw_taskbar();
static void bring_on_top(GntWidget *widget);

void gnt_screen_take_focus(GntWidget *widget)
{
	GntWidget *w = NULL;

	if (lock_focus_list)
		return;

	if (focus_list)
		w = focus_list->data;

	/* XXX: ew */
	focus_list = g_list_first(focus_list);
	focus_list = g_list_append(focus_list, widget);
	focus_list = g_list_find(focus_list, widget);

	gnt_widget_set_focus(widget, TRUE);
	if (w)
		gnt_widget_set_focus(w, FALSE);
	draw_taskbar();
}

void gnt_screen_remove_widget(GntWidget *widget)
{
	int pos = g_list_index(g_list_first(focus_list), widget);
	GList *next;

	if (lock_focus_list)
		return;

	if (pos == -1)
		return;

	focus_list = g_list_first(focus_list);
	focus_list = g_list_remove(focus_list, widget);
	next = g_list_nth(focus_list, pos - 1);
	if (next)
		focus_list = next;

	if (focus_list)
	{
		bring_on_top(focus_list->data);
	}
	draw_taskbar();
}

static void
bring_on_top(GntWidget *widget)
{
	GntNode *node = g_hash_table_lookup(nodes, widget);

	g_return_if_fail(focus_list->data == widget);

	if (!node)
		return;

	gnt_widget_set_focus(focus_list->data, TRUE);
	gnt_widget_draw(focus_list->data);

	top_panel(node->panel);

	if (window_list.window)
	{
		GntNode *nd = g_hash_table_lookup(nodes, window_list.window);
		top_panel(nd->panel);
	}
	update_panels();
	doupdate();
}

static void
draw_taskbar()
{
	static WINDOW *taskbar = NULL;
	GList *iter;
	int n, width = 0;
	int i;

	if (taskbar == NULL)
	{
		taskbar = newwin(1, getmaxx(stdscr), getmaxy(stdscr) - 1, 0);
	}

	wbkgdset(taskbar, '\0' | COLOR_PAIR(GNT_COLOR_NORMAL));
	werase(taskbar);

	n = g_list_length(g_list_first(focus_list));
	if (n)
		width = getmaxx(stdscr) / n;

	for (i = 0, iter = g_list_first(focus_list); iter; iter = iter->next, i++)
	{
		GntWidget *w = iter->data;
		int color;

		if (w == focus_list->data)
		{
			/* This is the current window in focus */
			color = GNT_COLOR_TITLE;
			GNT_WIDGET_UNSET_FLAGS(w, GNT_WIDGET_URGENT);
		}
		else if (GNT_WIDGET_IS_FLAG_SET(w, GNT_WIDGET_URGENT))
		{
			/* This is a window with the URGENT hint set */
			color = GNT_COLOR_TITLE_D;
		}
		else
		{
			color = GNT_COLOR_NORMAL;
		}
		wbkgdset(taskbar, '\0' | COLOR_PAIR(color));
		mvwhline(taskbar, 0, width * i, ' ' | COLOR_PAIR(color), width);
		mvwprintw(taskbar, 0, width * i, "%s", GNT_BOX(w)->title);
	}

	wrefresh(taskbar);
}

static void
switch_window(int direction)
{
	GntWidget *w = NULL;
	if (focus_list)
		w = focus_list->data;

	if (direction == 1)
	{
		if (focus_list && focus_list->next)
			focus_list = focus_list->next;
		else
			focus_list = g_list_first(focus_list);
	}
	else if (direction == -1)
	{
		if (focus_list && focus_list->prev)
			focus_list = focus_list->prev;
		else
			focus_list = g_list_last(focus_list);
	}
	
	if (focus_list)
	{
		bring_on_top(focus_list->data);
	}

	if (w && (!focus_list || w != focus_list->data))
	{
		gnt_widget_set_focus(w, FALSE);
	}
}

static void
window_list_activate(GntTree *tree, gpointer null)
{
	GntWidget *widget = gnt_tree_get_selection_data(GNT_TREE(tree));
	GntWidget *old = NULL;

	if (focus_list)
		old = focus_list->data;

	focus_list = g_list_find(g_list_first(focus_list), widget);
	bring_on_top(widget);

	if (old && (!focus_list || old != focus_list->data))
	{
		gnt_widget_set_focus(old, FALSE);
	}
}

static void
show_window_list()
{
	GntWidget *tree, *win;
	GList *iter;

	if (window_list.window)
		return;

	win = window_list.window = gnt_box_new(FALSE, FALSE);
	gnt_box_set_toplevel(GNT_BOX(win), TRUE);
	gnt_box_set_title(GNT_BOX(win), "Window List");
	gnt_box_set_pad(GNT_BOX(win), 0);

	tree = window_list.tree = gnt_tree_new();

	for (iter = g_list_first(focus_list); iter; iter = iter->next)
	{
		GntBox *box = GNT_BOX(iter->data);

		gnt_tree_add_row_after(GNT_TREE(tree), box, box->title, NULL, NULL);
	}

	gnt_box_add_widget(GNT_BOX(win), tree);

	gnt_widget_set_size(tree, getmaxx(stdscr) / 3, getmaxy(stdscr) / 2);
	gnt_widget_set_position(win, getmaxx(stdscr) / 3, getmaxy(stdscr) / 4);

	lock_focus_list = 1;
	gnt_widget_show(win);
	lock_focus_list = 0;

	g_signal_connect(G_OBJECT(tree), "activate", G_CALLBACK(window_list_activate), NULL);
}

static gboolean
io_invoke(GIOChannel *source, GIOCondition cond, gpointer null)
{
	char buffer[256];
	gboolean ret = FALSE;
	static GntKeyPressMode mode = GNT_KP_MODE_NORMAL;

	int rd = read(0, buffer, sizeof(buffer) - 1);
	if (rd < 0)
	{
		endwin();
		printf("ERROR!\n");
		exit(1);
	}
	else if (rd == 0)
	{
		endwin();
		printf("EOF\n");
		exit(1);
	}

	buffer[rd] = 0;

	if (mode == GNT_KP_MODE_NORMAL)
	{
		if (focus_list)
		{
			ret = gnt_widget_key_pressed(focus_list->data, buffer);
		}

		if (!ret)
		{
			if (buffer[0] == 27)
			{
				/* Some special key has been pressed */
				if (strcmp(buffer+1, GNT_KEY_POPUP) == 0)
				{}
				else if (strcmp(buffer + 1, "c") == 0)
				{
					/* Alt + c was pressed. I am going to use it to close a window. */
					if (focus_list)
					{
						gnt_widget_destroy(focus_list->data);
					}
				}
				else if (strcmp(buffer + 1, "q") == 0)
				{
					/* I am going to use Alt + q to quit. */
					g_main_loop_quit(loop);
				}
				else if (strcmp(buffer + 1, "n") == 0)
				{
					/* Alt + n to go to the next window */
					switch_window(1);
				}
				else if (strcmp(buffer + 1, "p") == 0)
				{
					/* Alt + p to go to the previous window */
					switch_window(-1);
				}
				else if (strcmp(buffer + 1, "m") == 0 && focus_list)
				{
					/* Move a window */
					mode = GNT_KP_MODE_MOVE;
				}
				else if (strcmp(buffer + 1, "w") == 0 && focus_list)
				{
					/* Window list */
					mode = GNT_KP_MODE_WINDOW_LIST;
					show_window_list();
				}
				else if (strcmp(buffer + 1, "r") == 0 && focus_list)
				{
					/* Resize window */
					mode = GNT_KP_MODE_RESIZE;
				}
			}
		}
	}
	else if (mode == GNT_KP_MODE_MOVE && focus_list)
	{
		if (buffer[0] == 27)
		{
			gboolean changed = FALSE;
			int x, y, w, h;
			GntWidget *widget = GNT_WIDGET(focus_list->data);

			gnt_widget_get_position(widget, &x, &y);
			gnt_widget_get_size(widget, &w, &h);

			if (strcmp(buffer + 1, GNT_KEY_LEFT) == 0)
			{
				if (x > X_MIN)
				{
					x--;
					changed = TRUE;
				}
			}
			else if (strcmp(buffer + 1, GNT_KEY_RIGHT) == 0)
			{
				if (x + w < X_MAX)
				{
					x++;
					changed = TRUE;
				}
			}
			else if (strcmp(buffer + 1, GNT_KEY_UP) == 0)
			{
				if (y > Y_MIN)
				{
					y--;
					changed = TRUE;
				}						
			}
			else if (strcmp(buffer + 1, GNT_KEY_DOWN) == 0)
			{
				if (y + h < Y_MAX)
				{
					y++;
					changed = TRUE;
				}
			}
			else if (buffer[1] == 0)
			{
				mode = GNT_KP_MODE_NORMAL;
				changed = TRUE;
			}

			if (changed)
			{
				GntNode *node = g_hash_table_lookup(nodes, widget);
				gnt_widget_set_position(widget, x, y);
				move_panel(node->panel, y, x);
				update_panels();
				doupdate();
			}
		}
		else if (*buffer == '\r')
		{
			mode = GNT_KP_MODE_NORMAL;
		}
	}
	else if (mode == GNT_KP_MODE_WINDOW_LIST && window_list.window)
	{
		gnt_widget_key_pressed(window_list.window, buffer);

		if (buffer[0] == '\r' || (buffer[0] == 27 && buffer[1] == 0))
		{
			mode = GNT_KP_MODE_NORMAL;
			lock_focus_list = 1;
			gnt_widget_destroy(window_list.window);
			window_list.window = NULL;
			window_list.tree = NULL;
			lock_focus_list = 0;
		}
	}
	else if (mode == GNT_KP_MODE_RESIZE)
	{
		if (buffer[0] == '\r' || (buffer[0] == 27 && buffer[1] == 0))
			mode = GNT_KP_MODE_NORMAL;
		else if (buffer[0] == 27)
		{
			GntWidget *widget = focus_list->data;
			gboolean changed = FALSE;
			int width, height;

			gnt_widget_get_size(widget, &width, &height);

			if (strcmp(buffer + 1, GNT_KEY_DOWN) == 0)
			{
				if (widget->priv.y + height < Y_MAX)
				{
					height++;
					changed = TRUE;
				}
			}
			else if (strcmp(buffer + 1, GNT_KEY_UP) == 0)
			{
				height--;
				changed = TRUE;
			}
			else if (strcmp(buffer + 1, GNT_KEY_LEFT) == 0)
			{
				width--;
				changed = TRUE;
			}
			else if (strcmp(buffer + 1, GNT_KEY_RIGHT) == 0)
			{
				if (widget->priv.x + width < X_MAX)
				{
					width++;
					changed = TRUE;
				}
			}

			if (changed)
			{
				GntNode *node = g_hash_table_lookup(nodes, widget);
				int x, y;

				gnt_widget_get_position(widget, &x, &y);

				hide_panel(node->panel);
				gnt_widget_set_size(widget, width, height);
				gnt_widget_set_position(widget, x, y);
				gnt_widget_draw(widget);
				replace_panel(node->panel, widget->window);
				show_panel(node->panel);
				update_panels();
				doupdate();
			}
		}
	}

	draw_taskbar();
	refresh();

	return TRUE;
}

void gnt_init()
{
	GIOChannel *channel = g_io_channel_unix_new(0);

	g_io_channel_set_encoding(channel, NULL, NULL);
	g_io_channel_set_buffered(channel, FALSE);
	g_io_channel_set_flags(channel, G_IO_FLAG_NONBLOCK, NULL );

	int result = g_io_add_watch(channel, 
					(G_IO_IN | G_IO_HUP | G_IO_ERR),
					io_invoke, NULL);
	const char *locale = setlocale(LC_ALL, "");

	if (locale && (strstr(locale, "UTF") || strstr(locale, "utf")))
		ascii_only = FALSE;
	else
		ascii_only = TRUE;

	initscr();
	start_color();
	gnt_init_colors();

	X_MIN = 0;
	Y_MIN = 0;
	X_MAX = getmaxx(stdscr);
	Y_MAX = getmaxy(stdscr) - 1;

	nodes = g_hash_table_new_full(g_direct_hash, g_direct_equal, NULL, free_node);

	wbkgdset(stdscr, '\0' | COLOR_PAIR(GNT_COLOR_NORMAL));
	noecho();
	refresh();
#if MAYBE_SOMEDAY
	mousemask(ALL_MOUSE_EVENTS | REPORT_MOUSE_POSITION, NULL);
#endif
	wbkgdset(stdscr, '\0' | COLOR_PAIR(GNT_COLOR_NORMAL));
	werase(stdscr);
	wrefresh(stdscr);

	g_type_init();
}

void gnt_main()
{
	loop = g_main_loop_new(NULL, FALSE);
	g_main_loop_run(loop);
}

/*********************************
 * Stuff for 'window management' *
 *********************************/

static void
free_node(gpointer data)
{
	GntNode *node = data;
	hide_panel(node->panel);
	del_panel(node->panel);
	g_free(node);
}

void gnt_screen_occupy(GntWidget *widget)
{
	GntNode *node;

	while (widget->parent)
		widget = widget->parent;
	
	if (g_hash_table_lookup(nodes, widget))
		return;		/* XXX: perhaps _update instead? */

	node = g_new0(GntNode, 1);
	node->me = widget;

	g_hash_table_replace(nodes, widget, node);

	if (window_list.window)
	{
		if ((GNT_IS_BOX(widget) && GNT_BOX(widget)->title) && window_list.window != widget
				&& GNT_WIDGET_IS_FLAG_SET(widget, GNT_WIDGET_CAN_TAKE_FOCUS))
			gnt_tree_add_row_after(GNT_TREE(window_list.tree), widget,
					GNT_BOX(widget)->title, NULL, NULL);
	}

	update_panels();
	doupdate();
}

void gnt_screen_release(GntWidget *widget)
{
	GntNode *node;

	gnt_screen_remove_widget(widget);
	node = g_hash_table_lookup(nodes, widget);

	if (node == NULL)	/* Yay! Nothing to do. */
		return;

	g_hash_table_remove(nodes, widget);

	if (window_list.window)
	{
		gnt_tree_remove(GNT_TREE(window_list.tree), widget);
	}

	update_panels();
	doupdate();
}

void gnt_screen_update(GntWidget *widget)
{
	GntNode *node;
	
	while (widget->parent)
		widget = widget->parent;
	
	gnt_box_sync_children(GNT_BOX(widget));
	node = g_hash_table_lookup(nodes, widget);
	if (node && !node->panel)
		node->panel = new_panel(node->me->window);

	if (window_list.window)
	{
		GntNode *nd = g_hash_table_lookup(nodes, window_list.window);
		top_panel(nd->panel);
	}

	update_panels();
	doupdate();
}

gboolean gnt_widget_has_focus(GntWidget *widget)
{
	GntWidget *w;
	if (!widget)
		return FALSE;

	w = widget;

	while (widget->parent)
		widget = widget->parent;

	if (widget == window_list.window)
		return TRUE;

	if (focus_list && focus_list->data == widget)
	{
		if (GNT_IS_BOX(widget) &&
				(GNT_BOX(widget)->active == w || widget == w))
			return TRUE;
	}

	return FALSE;
}

void gnt_widget_set_urgent(GntWidget *widget)
{
	while (widget->parent)
		widget = widget->parent;

	if (focus_list && focus_list->data == widget)
		return;

	GNT_WIDGET_SET_FLAGS(widget, GNT_WIDGET_URGENT);
	draw_taskbar();
}

void gnt_quit()
{
	endwin();
}

gboolean gnt_ascii_only()
{
	return ascii_only;
}