textbox.c

xmms-1.2.10.tar.gz学习使用的就下吧

/*  XMMS - Cross-platform multimedia player
 *  Copyright (C) 1998-2001  Peter Alm, Mikael Alm, Olle Hallnas,
 *                           Thomas Nilsson and 4Front Technologies
 *  Copyright (C) 1999-2001  Haavard Kvaalen
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */
#include "xmms.h"
#include <gdk/gdkprivate.h>
#include <ctype.h>

static void textbox_generate_pixmap(TextBox * tb);

static void textbox_draw(Widget * w)
{
	TextBox *tb = (TextBox *) w;
	gint cw;
	GdkPixmap *obj;
	GdkPixmap *src;

	if (tb->tb_text &&
	    (!tb->tb_pixmap_text ||
	     strcmp(tb->tb_text, tb->tb_pixmap_text)))
		textbox_generate_pixmap(tb);

	if (tb->tb_pixmap)
	{
		if (skin_get_id() != tb->tb_skin_id)
		{
			tb->tb_skin_id = skin_get_id();
			textbox_generate_pixmap(tb);
		}
		obj = tb->tb_widget.parent;
		src = tb->tb_pixmap;

		cw = tb->tb_pixmap_width - tb->tb_offset;
		if (cw > tb->tb_widget.width)
			cw = tb->tb_widget.width;
		gdk_draw_pixmap(obj, tb->tb_widget.gc, src, tb->tb_offset, 0,
				tb->tb_widget.x, tb->tb_widget.y, cw,
				tb->tb_widget.height);
		if (cw < tb->tb_widget.width)
			gdk_draw_pixmap(obj, tb->tb_widget.gc, src, 0, 0,
					tb->tb_widget.x + cw, tb->tb_widget.y,
					tb->tb_widget.width - cw,
					tb->tb_widget.height);
	}
}

static gint textbox_scroll(gpointer data)
{
	TextBox *tb = (TextBox *) data;

	if (!tb->tb_is_dragging)
	{
		if (cfg.smooth_title_scroll)
			tb->tb_offset++;
		else
			tb->tb_offset += 5;
		if (tb->tb_offset >= tb->tb_pixmap_width)
			tb->tb_offset -= tb->tb_pixmap_width;
		draw_widget(tb);
	}
	return TRUE;
}

static void textbox_button_press(GtkWidget * w, GdkEventButton * event, gpointer data)
{
	TextBox *tb = (TextBox *) data;

	if (event->button != 1)
		return;
	if (inside_widget(event->x, event->y, &tb->tb_widget) &&
	    tb->tb_scroll_allowed &&
	    tb->tb_pixmap_width > tb->tb_widget.width && tb->tb_is_scrollable)
	{
		tb->tb_is_dragging = TRUE;
		tb->tb_drag_off = tb->tb_offset;
		tb->tb_drag_x = event->x;
	}
}

static void textbox_motion(GtkWidget * w, GdkEventMotion * event, gpointer data)
{
	TextBox *tb = (TextBox *) data;

	if (tb->tb_is_dragging)
	{
		if (tb->tb_scroll_allowed &&
		    tb->tb_pixmap_width > tb->tb_widget.width)
		{
			tb->tb_offset = tb->tb_drag_off - (event->x - tb->tb_drag_x);
			while (tb->tb_offset < 0)
				tb->tb_offset += tb->tb_pixmap_width;
			while (tb->tb_offset > tb->tb_pixmap_width)
				tb->tb_offset -= tb->tb_pixmap_width;
			draw_widget(tb);
		}
	}
}

static void textbox_button_release(GtkWidget * w, GdkEventButton * event, gpointer data)
{
	TextBox *tb = (TextBox *) data;

	if (event->button == 1)
		tb->tb_is_dragging = FALSE;
}

static gboolean textbox_should_scroll(TextBox *tb)
{
	if (!tb->tb_scroll_allowed)
		return FALSE;

	if (tb->tb_font)
	{
		int width = gdk_text_width(tb->tb_font,
					   tb->tb_text, strlen(tb->tb_text));
		if (width <= tb->tb_widget.width)
			return FALSE;
		else
			return TRUE;
	}

	if (strlen(tb->tb_text) * 5 > tb->tb_widget.width)
		return TRUE;

	return FALSE;
}

void textbox_set_text(TextBox * tb, gchar * text)
{
        lock_widget(tb);
	
	if (tb->tb_text)
	{
		if (!strcmp(text, tb->tb_text))
		{
		        unlock_widget(tb);
			return;
		}
		g_free(tb->tb_text);
	}

	tb->tb_text = g_strdup(text);

	unlock_widget(tb);
	draw_widget(tb);
}

static void textbox_generate_xfont_pixmap(TextBox * tb, gchar *pixmaptext)
{
	gint length, i;
	GdkGC *gc, *maskgc;
	GdkColor *c, pattern;
	GdkBitmap *mask;

	length = strlen(pixmaptext);

	tb->tb_pixmap_width = gdk_text_width(tb->tb_font, pixmaptext, length);
	if (tb->tb_pixmap_width < tb->tb_widget.width)
		tb->tb_pixmap_width = tb->tb_widget.width;
	tb->tb_pixmap = gdk_pixmap_new(mainwin->window, tb->tb_pixmap_width,
				       tb->tb_widget.height,
				       gdk_rgb_get_visual()->depth);
	gc = tb->tb_widget.gc;
	c = get_skin_color(SKIN_TEXTBG);
	for (i = 0; i < tb->tb_widget.height; i++)
	{
		gdk_gc_set_foreground(gc, &c[6 * i / tb->tb_widget.height]);
		gdk_draw_line(tb->tb_pixmap, gc, 0, i, tb->tb_pixmap_width, i);
	}

	mask = gdk_pixmap_new(mainwin->window, tb->tb_pixmap_width,
			      tb->tb_widget.height, 1);
	maskgc = gdk_gc_new(mask);
	pattern.pixel = 0;
	gdk_gc_set_foreground(maskgc, &pattern);
	gdk_draw_rectangle(mask, maskgc, TRUE, 0, 0,
			   tb->tb_pixmap_width, tb->tb_widget.height);
	pattern.pixel = 1;
	gdk_gc_set_foreground(maskgc, &pattern);
	gdk_draw_text(mask, tb->tb_font, maskgc, 0,
		      tb->tb_font->ascent, pixmaptext, length);
	gdk_gc_unref(maskgc);

	gdk_gc_set_clip_mask(gc, mask);
	c = get_skin_color(SKIN_TEXTFG);
	for (i = 0; i < tb->tb_widget.height; i++)
	{
		gdk_gc_set_foreground(gc, &c[6 * i / tb->tb_widget.height]);
		gdk_draw_line(tb->tb_pixmap, gc, 0, i, tb->tb_pixmap_width, i);
	}
	gdk_pixmap_unref(mask);
	gdk_gc_set_clip_mask(gc, NULL);
}

static void textbox_handle_special_char(char c, int *x, int *y)
{
	switch (c)
	{
		case '"':
			*x = 130;
			*y = 0;
			break;
		case ':':
			*x = 60;
			*y = 6;
			break;
		case '(':
			*x = 65;
			*y = 6;
			break;
		case ')':
			*x = 70;
			*y = 6;
			break;
		case '-':
			*x = 75;
			*y = 6;
			break;
		case '`':
		case '\'':
			*x = 80;
			*y = 6;
			break;
		case '!':
			*x = 85;
			*y = 6;
			break;
		case '_':
			*x = 90;
			*y = 6;
			break;
		case '+':
			*x = 95;
			*y = 6;
			break;
		case '\\':
			*x = 100;
			*y = 6;
			break;
		case '/':
			*x = 105;
			*y = 6;
			break;
		case '[':
			*x = 110;
			*y = 6;
			break;
		case ']':
			*x = 115;
			*y = 6;
			break;
		case '^':
			*x = 120;
			*y = 6;
			break;
		case '&':
			*x = 125;
			*y = 6;
			break;
		case '%':
			*x = 130;
			*y = 6;
			break;
		case '.':
		case ',':
			*x = 135;
			*y = 6;
			break;
		case '=':
			*x = 140;
			*y = 6;
			break;
		case '$':
			*x = 145;
			*y = 6;
			break;
		case '#':
			*x = 150;
			*y = 6;
			break;
		case '