bursh.c

linux gtk+基础编程源代码

#include<gtk/gtk.h>
static GtkWidget *window = NULL;
static GdkPixmap *pixmap = NULL;
static gboolean scribble_configure_event(GtkWidget *widget, GdkEventConfigure *event, gpointer data)
{
	if(pixmap)
		g_object_unref(G_OBJECT(pixmap));
	pixmap = gdk_pixmap_new(widget->window, widget->allocation.width, widget->allocation.height, -1);
	gdk_draw_rectangle(pixmap, widget->style->white_gc, TRUE, 0, 0, widget->allocation.width, widget->allocation.height);
	return TRUE;
}

static gboolean scribble_expose_event(GtkWidget *widget, GdkEventExpose *event, gpointer data)
{
	gdk_draw_drawable(widget->window, widget->style->fg_gc[GTK_WIDGET_STATE(widget)], pixmap, event->area.x, event->area.y, event->area.x, event->area.y, event->area.width, event->area.height);
	return FALSE;
}
static void draw_brush(GtkWidget *widget, gdouble x, gdouble y)
{
	GdkRectangle update_rect;
	update_rect.x = x - 3;
	update_rect.y = y - 3;
	update_rect.width = 6;
	update_rect.height = 6;

	gdk_draw_rectangle(pixmap,
			widget->style->black_gc,
			TRUE,
			update_rect.x, update_rect.y,
			update_rect.width, update_rect.height);
	gdk_window_invalidate_rect(widget->window, 
			&update_rect,
			FALSE);
}
static gboolean 
scribble_button_press_event(GtkWidget *widget,
		GdkEventButton *event,
		gpointer data)
{
	if(pixmap == NULL)
		return FALSE;
	if(event->button == 1)
		draw_brush(widget, event->x, event->y);
	return TRUE;
}

static gboolean
scribble_motion_notify_event(
		GtkWidget *widget,
		GdkEventMotion *event,
		gpointer data)
{
	int x, y;
	GdkModifierType state;

	if(pixmap == NULL)
		return FALSE;
	gdk_window_get_pointer(event->window, &x, &y, &state);
	if(state & GDK_BUTTON1_MASK)
		draw_brush(widget, x, y);
	return TRUE;
}

static gboolean 
checkerboard_expose(GtkWidget *da,
		GdkEventExpose *event,
		gpointer data)
{
	gint i, j, xcount, ycount;
	GdkGC *gc1, *gc2;
	GdkColor color;
#define CHECK_SIZE 10
#define SPACING 2
	gc1 = gdk_gc_new(da->window);
	color.red = 30000;
	color.green = 0;
	color.blue = 30000;
	gdk_gc_set_rgb_fg_color(gc1, &color);

	gc2 = gdk_gc_new(da->window);
	color.red = 65535;
	color.green = 65535;
	color.blue = 65535;
	gdk_gc_set_rgb_fg_color(gc2, &color);
	xcount = 0;
	i = SPACING;
	while(i < da->allocation.width)
	{
		j = SPACING;
		ycount = xcount % 2;
		while(j < da->allocation.height)
		{
			GdkGC *gc;
			if(ycount % 2)
				gc = gc1;
			else
				gc = gc2;
			gdk_draw_rectangle(da->window, gc, TRUE, i, j, CHECK_SIZE, CHECK_SIZE);
			j += CHECK_SIZE + SPACING;
			++ ycount;
		}
		i += CHECK_SIZE + SPACING;
		++ xcount;
	}
	g_object_unref(G_OBJECT(gc1));
	g_object_unref(G_OBJECT(gc2));
	return TRUE;	
}

int main(int argc, char **argv)
{
	GtkWidget	*frame;
	GtkWidget	*vbox;
	GtkWidget	*da;
	GtkWidget	*label;
	gtk_init(&argc, &argv);
	window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
	gtk_window_set_title(GTK_WINDOW(window), "绘图软件");
	g_signal_connect(G_OBJECT(window), "destroy", G_CALLBACK(gtk_main_quit), NULL);

	gtk_container_set_border_width(GTK_CONTAINER(window), 10);
	vbox = gtk_vbox_new(FALSE, 8);
	gtk_container_set_border_width(GTK_CONTAINER(vbox), 8);
	gtk_container_add(GTK_CONTAINER(window), vbox);

	label = gtk_label_new(NULL);
	gtk_label_set_markup(GTK_LABEL(label), "<u>绘图区域</u>");
	gtk_box_pack_start(GTK_BOX(vbox), label, FALSE, FALSE, 0);

	frame = gtk_frame_new(NULL);
	gtk_frame_set_shadow_type(GTK_FRAME(frame), GTK_SHADOW_IN);
	gtk_box_pack_start(GTK_BOX(vbox), frame, TRUE, TRUE, 0);
	da = gtk_drawing_area_new();
	gtk_widget_set_size_request(da, 100, 100);
	gtk_container_add(GTK_CONTAINER(frame), da);
	g_signal_connect(da, "expose_event", G_CALLBACK(scribble_expose_event), NULL);
	g_signal_connect(da, "configure_event", G_CALLBACK(scribble_configure_event), NULL);
	g_signal_connect(da, "motion_notify_event", G_CALLBACK(scribble_motion_notify_event), NULL);
	g_signal_connect(da, "button_press_event", G_CALLBACK(scribble_button_press_event), NULL);
	gtk_widget_set_events(da, gtk_widget_get_events(da)
			| GDK_LEAVE_NOTIFY_MASK
			| GDK_BUTTON_PRESS_MASK
			| GDK_POINTER_MOTION_MASK
			| GDK_POINTER_MOTION_HINT_MASK);
	gtk_widget_show_all(window);
	gtk_main();
	return FALSE;
}