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GTK+ 2.0 教學-Scribble

scribble-simple.c

/* GTK - GIMP工具包
 * 版權 (C) 1995-1997 Peter Mattis, Spencer Kimball 和 Josh MacDonald 所有
 *
 * 本程序是自由軟件。你可以在自由軟件基金發佈的 GNU GPL 的條款下重新分發
 * 或修改它。GPL 可以使用版本 2 或(由你選擇)任何隨後的版本。
 *
 * 本程序分發的目的是它可能對其他人有用,但不提供任何的擔保,包括隱含的
 * 和適合特定用途的保證。請查閱GNU通用公共許可證獲得詳細的信息。
 *
 * 你應該已經隨該軟件一起收到一份GNU通用公共許可。如果還沒有,請寫信給
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

#include <stdlib.h>
#include <gtk/gtk.h>

/* 繪製區的後端位圖 */ 
static GdkPixmap *pixmap = NULL;

/* 創建一個適當大小的後端位圖 */
static gboolean configure_event( GtkWidget         *widget,
                                 GdkEventConfigure *event )
{
  if (pixmap)
    g_object_unref (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;
}

/*  從後端位圖重新繪製螢幕 */
static gboolean expose_event( GtkWidget      *widget,
                              GdkEventExpose *event )
{
  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;
}

/* 在螢幕上繪製一個矩形 */
static void draw_brush( GtkWidget *widget,
                        gdouble    x,
                        gdouble    y)
{
  GdkRectangle update_rect;

  update_rect.x = x - 5;
  update_rect.y = y - 5;
  update_rect.width = 10;
  update_rect.height = 10;
  gdk_draw_rectangle (pixmap,
		      widget->style->black_gc,
		      TRUE,
		      update_rect.x, update_rect.y,
		      update_rect.width, update_rect.height);
  gtk_widget_queue_draw_area (widget, 
		              update_rect.x, update_rect.y,
		              update_rect.width, update_rect.height);
}

static gboolean button_press_event( GtkWidget      *widget,
                                    GdkEventButton *event )
{
  if (event->button == 1 && pixmap != NULL)
    draw_brush (widget, event->x, event->y);

  return TRUE;
}

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

  if (event->is_hint)
    gdk_window_get_pointer (event->window, &x, &y, &state);
  else
    {
      x = event->x;
      y = event->y;
      state = event->state;
    }

  if (state & GDK_BUTTON1_MASK && pixmap != NULL)
    draw_brush (widget, x, y);

  return TRUE;
}

void quit ()
{
  exit (0);
}

int main( int   argc, 
          char *argv[] )
{
  GtkWidget *window;
  GtkWidget *drawing_area;
  GtkWidget *vbox;

  GtkWidget *button;

  gtk_init (&argc, &argv);

  window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
  gtk_widget_set_name (window, "Test Input");

  vbox = gtk_vbox_new (FALSE, 0);
  gtk_container_add (GTK_CONTAINER (window), vbox);
  gtk_widget_show (vbox);

  g_signal_connect (G_OBJECT (window), "destroy",
                    G_CALLBACK (quit), NULL);
/* 創建繪圖區 */

  drawing_area = gtk_drawing_area_new ();
  gtk_widget_set_size_request (GTK_WIDGET (drawing_area), 200, 200);
  gtk_box_pack_start (GTK_BOX (vbox), drawing_area, TRUE, TRUE, 0);

  gtk_widget_show (drawing_area);

 /* 用於處理後端位圖的信號 */

  g_signal_connect (G_OBJECT (drawing_area), "expose_event",
		    G_CALLBACK (expose_event), NULL);
  g_signal_connect (G_OBJECT (drawing_area),"configure_event",
		    G_CALLBACK (configure_event), NULL);

 /* 事件信號 */

  g_signal_connect (G_OBJECT (drawing_area), "motion_notify_event",
		    G_CALLBACK (motion_notify_event), NULL);
  g_signal_connect (G_OBJECT (drawing_area), "button_press_event",
		    G_CALLBACK (button_press_event), NULL);

  gtk_widget_set_events (drawing_area, GDK_EXPOSURE_MASK
			 | GDK_LEAVE_NOTIFY_MASK
			 | GDK_BUTTON_PRESS_MASK
			 | GDK_POINTER_MOTION_MASK
			 | GDK_POINTER_MOTION_HINT_MASK);

   /* 退出按鈕 */
  button = gtk_button_new_with_label ("Quit");
  gtk_box_pack_start (GTK_BOX (vbox), button, FALSE, FALSE, 0);

  g_signal_connect_swapped (G_OBJECT (button), "clicked",
			    G_CALLBACK (gtk_widget_destroy),
			    G_OBJECT (window));
  gtk_widget_show (button);

  gtk_widget_show (window);

  gtk_main ();

  return 0;
}

scribble-xinput.c

/* GTK - GIMP工具包
 * 版權 (C) 1995-1997 Peter Mattis, Spencer Kimball 和 Josh MacDonald 所有
 *
 * 本程序是自由軟件。你可以在自由軟件基金發佈的 GNU GPL 的條款下重新分發
 * 或修改它。GPL 可以使用版本 2 或(由你選擇)任何隨後的版本。
 *
 * 本程序分發的目的是它可能對其他人有用,但不提供任何的擔保,包括隱含的
 * 和適合特定用途的保證。請查閱GNU通用公共許可證獲得詳細的信息。
 *
 * 你應該已經隨該軟件一起收到一份GNU通用公共許可。如果還沒有,請寫信給
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */
#include <gtk/gtk.h>

/* 繪製區的後端位圖 */
static GdkPixmap *pixmap = NULL;

/* 創建一個適當大小的後端位圖 */
static gboolean
configure_event (GtkWidget *widget, GdkEventConfigure *event)
{
  if (pixmap)
     g_object_unref (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;
}

/* 從後端位圖重新繪製螢幕 */
static gboolean
expose_event (GtkWidget *widget, GdkEventExpose *event)
{
  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;
}

/* 在螢幕上畫一個矩形,大小依據壓力,顏色依據設備的型態 */
static void
draw_brush (GtkWidget *widget, GdkInputSource source,
            gdouble x, gdouble y, gdouble pressure)
{
  GdkGC *gc;
  GdkRectangle update_rect;

  switch (source)
    {
    case GDK_SOURCE_MOUSE:
      gc = widget->style->dark_gc[GTK_WIDGET_STATE (widget)];
      break;
    case GDK_SOURCE_PEN:
      gc = widget->style->black_gc;
      break;
    case GDK_SOURCE_ERASER:
      gc = widget->style->white_gc;
      break;
    default:
      gc = widget->style->light_gc[GTK_WIDGET_STATE (widget)];
    }

  update_rect.x = x - 10 * pressure;
  update_rect.y = y - 10 * pressure;
  update_rect.width = 20 * pressure;
  update_rect.height = 20 * pressure;
  gdk_draw_rectangle (pixmap, gc, TRUE,
                      update_rect.x, update_rect.y,
                      update_rect.width, update_rect.height);
  gtk_widget_queue_draw_area (widget, 
                      update_rect.x, update_rect.y,
                      update_rect.width, update_rect.height);
}

static void
print_button_press (GdkDevice *device)
{
  g_print ("Button press on device '%s'\n", device->name);
}

static gboolean
button_press_event (GtkWidget *widget, GdkEventButton *event)
{
  print_button_press (event->device);

  if (event->button == 1 && pixmap != NULL) {
    gdouble pressure;
    gdk_event_get_axis ((GdkEvent *)event, GDK_AXIS_PRESSURE, &pressure);
    draw_brush (widget, event->device->source, event->x, event->y, pressure);
  }

  return TRUE;
}

static gboolean
motion_notify_event (GtkWidget *widget, GdkEventMotion *event)
{
  gdouble x, y;
  gdouble pressure;
  GdkModifierType state;

  if (event->is_hint) 
    {
      gdk_device_get_state (event->device, event->window, NULL, &state);
      gdk_event_get_axis ((GdkEvent *)event, GDK_AXIS_X, &x);
      gdk_event_get_axis ((GdkEvent *)event, GDK_AXIS_Y, &y);
      gdk_event_get_axis ((GdkEvent *)event, GDK_AXIS_PRESSURE, &pressure);
    }
  else
    {
      x = event->x;
      y = event->y;
      gdk_event_get_axis ((GdkEvent *)event, GDK_AXIS_PRESSURE, &pressure);
      state = event->state;
    }

  if (state & GDK_BUTTON1_MASK && pixmap != NULL)
    draw_brush (widget, event->device->source, x, y, pressure);

  return TRUE;
}

void
input_dialog_destroy (GtkWidget *w, gpointer data)
{
  *((GtkWidget **)data) = NULL;
}

void
create_input_dialog ()
{
  static GtkWidget *inputd = NULL;

  if (!inputd)
    {
      inputd = gtk_input_dialog_new();

      g_signal_connect (G_OBJECT (inputd), "destroy",
                        G_CALLBACK (input_dialog_destroy), (gpointer) &inputd);
      g_signal_connect_swapped (G_OBJECT (GTK_INPUT_DIALOG (inputd)->close_button),
                                "clicked",
                                G_CALLBACK (gtk_widget_hide),
                                G_OBJECT (inputd));
      gtk_widget_hide (GTK_INPUT_DIALOG (inputd)->save_button);

      gtk_widget_show (inputd);
    }
  else
    {
      if (!GTK_WIDGET_MAPPED (inputd))
        gtk_widget_show (inputd);
      else
        gdk_window_raise (inputd->window);
    }
}

void
int
main (int argc, char *argv[])
{
  GtkWidget *window;
  GtkWidget *drawing_area;
  GtkWidget *vbox;

  GtkWidget *button;

  gtk_init (&argc, &argv);

  window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
  gtk_widget_set_name (window, "Test Input");

  vbox = gtk_vbox_new (FALSE, 0);
  gtk_container_add (GTK_CONTAINER (window), vbox);
  gtk_widget_show (vbox);

  g_signal_connect (G_OBJECT (window), "destroy",
                    G_CALLBACK (gtk_main_quit), NULL);

   /* 創建繪圖區 */

  drawing_area = gtk_drawing_area_new ();
  gtk_widget_set_size_request (GTK_WIDGET (drawing_area), 200, 200);
  gtk_box_pack_start (GTK_BOX (vbox), drawing_area, TRUE, TRUE, 0);

  gtk_widget_show (drawing_area);

  /* 用於處理後端位圖的信號 */

  g_signal_connect (G_OBJECT (drawing_area), "expose_event",
                    G_CALLBACK (expose_event), NULL);
  g_signal_connect (G_OBJECT(drawing_area),"configure_event",
                    G_CALLBACK (configure_event), NULL);

/* 事件信號 */

  g_signal_connect (G_OBJECT (drawing_area), "motion_notify_event",
                    G_CALLBACK (motion_notify_event), NULL);
  g_signal_connect (G_OBJECT (drawing_area), "button_press_event",
                    G_CALLBACK (button_press_event), NULL);

  gtk_widget_set_events (drawing_area, GDK_EXPOSURE_MASK
                         | GDK_LEAVE_NOTIFY_MASK
                         | GDK_BUTTON_PRESS_MASK
                         | GDK_POINTER_MOTION_MASK
                         | GDK_POINTER_MOTION_HINT_MASK);

  /* 下面的呼叫允許為繪圖區跟蹤和處理擴展事件 */
  gtk_widget_set_extension_events (drawing_area, GDK_EXTENSION_EVENTS_CURSOR);

  /* 幾個按鈕 */
  button = gtk_button_new_with_label ("Input Dialog");
  gtk_box_pack_start (GTK_BOX (vbox), button, FALSE, FALSE, 0);

  g_signal_connect (G_OBJECT (button), "clicked",
                    G_CALLBACK (create_input_dialog), NULL);
  gtk_widget_show (button);

  button = gtk_button_new_with_label ("Quit");
  gtk_box_pack_start (GTK_BOX (vbox), button, FALSE, FALSE, 0);

  g_signal_connect_swapped (G_OBJECT (button), "clicked",
                            G_CALLBACK (gtk_widget_destroy),
                            G_OBJECT (window));
  gtk_widget_show (button);

  gtk_widget_show (window);

  gtk_main ();

  return 0;
}
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