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82f6ccd79c
2008-08-11 Sven Neumann <sven@gimp.org> * examples/*: updated the (quite outdated) examples to use canonical signal names as well. Removed some unneeded casts and trailing whitespace while I was on it... svn path=/trunk/; revision=21071
254 lines
7.2 KiB
C
254 lines
7.2 KiB
C
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/* GTK - The GIMP Toolkit
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* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#include <gtk/gtk.h>
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/* Backing pixmap for drawing area */
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static GdkPixmap *pixmap = NULL;
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/* Create a new backing pixmap of the appropriate size */
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static gboolean
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configure_event (GtkWidget *widget, GdkEventConfigure *event)
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{
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if (pixmap)
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g_object_unref (pixmap);
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pixmap = gdk_pixmap_new (widget->window,
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widget->allocation.width,
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widget->allocation.height,
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-1);
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gdk_draw_rectangle (pixmap,
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widget->style->white_gc,
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TRUE,
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0, 0,
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widget->allocation.width,
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widget->allocation.height);
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return TRUE;
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}
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/* Redraw the screen from the backing pixmap */
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static gboolean
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expose_event (GtkWidget *widget, GdkEventExpose *event)
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{
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gdk_draw_drawable (widget->window,
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widget->style->fg_gc[GTK_WIDGET_STATE (widget)],
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pixmap,
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event->area.x, event->area.y,
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event->area.x, event->area.y,
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event->area.width, event->area.height);
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return FALSE;
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}
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/* Draw a rectangle on the screen, size depending on pressure,
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and color on the type of device */
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static void
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draw_brush (GtkWidget *widget, GdkInputSource source,
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gdouble x, gdouble y, gdouble pressure)
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{
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GdkGC *gc;
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GdkRectangle update_rect;
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switch (source)
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{
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case GDK_SOURCE_MOUSE:
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gc = widget->style->dark_gc[GTK_WIDGET_STATE (widget)];
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break;
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case GDK_SOURCE_PEN:
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gc = widget->style->black_gc;
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break;
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case GDK_SOURCE_ERASER:
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gc = widget->style->white_gc;
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break;
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default:
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gc = widget->style->light_gc[GTK_WIDGET_STATE (widget)];
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}
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update_rect.x = x - 10 * pressure;
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update_rect.y = y - 10 * pressure;
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update_rect.width = 20 * pressure;
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update_rect.height = 20 * pressure;
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gdk_draw_rectangle (pixmap, gc, TRUE,
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update_rect.x, update_rect.y,
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update_rect.width, update_rect.height);
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gtk_widget_queue_draw_area (widget,
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update_rect.x, update_rect.y,
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update_rect.width, update_rect.height);
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}
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static void
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print_button_press (GdkDevice *device)
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{
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g_print ("Button press on device '%s'\n", device->name);
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}
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static gboolean
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button_press_event (GtkWidget *widget, GdkEventButton *event)
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{
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print_button_press (event->device);
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if (event->button == 1 && pixmap != NULL) {
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gdouble pressure;
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gdk_event_get_axis ((GdkEvent *)event, GDK_AXIS_PRESSURE, &pressure);
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draw_brush (widget, event->device->source, event->x, event->y, pressure);
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}
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return TRUE;
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}
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static gboolean
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motion_notify_event (GtkWidget *widget, GdkEventMotion *event)
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{
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gdouble x, y;
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gdouble pressure;
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GdkModifierType state;
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if (event->is_hint)
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{
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gdk_device_get_state (event->device, event->window, NULL, &state);
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gdk_event_get_axis ((GdkEvent *)event, GDK_AXIS_X, &x);
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gdk_event_get_axis ((GdkEvent *)event, GDK_AXIS_Y, &y);
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gdk_event_get_axis ((GdkEvent *)event, GDK_AXIS_PRESSURE, &pressure);
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}
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else
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{
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x = event->x;
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y = event->y;
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gdk_event_get_axis ((GdkEvent *)event, GDK_AXIS_PRESSURE, &pressure);
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state = event->state;
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}
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if (state & GDK_BUTTON1_MASK && pixmap != NULL)
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draw_brush (widget, event->device->source, x, y, pressure);
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return TRUE;
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}
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void
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input_dialog_destroy (GtkWidget *w, gpointer data)
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{
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*((GtkWidget **)data) = NULL;
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}
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void
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create_input_dialog ()
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{
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static GtkWidget *inputd = NULL;
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if (!inputd)
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{
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inputd = gtk_input_dialog_new();
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g_signal_connect (inputd, "destroy",
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G_CALLBACK (input_dialog_destroy), &inputd);
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g_signal_connect_swapped (GTK_INPUT_DIALOG (inputd)->close_button,
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"clicked",
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G_CALLBACK (gtk_widget_hide),
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inputd);
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gtk_widget_hide (GTK_INPUT_DIALOG (inputd)->save_button);
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gtk_widget_show (inputd);
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}
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else
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{
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if (!GTK_WIDGET_MAPPED (inputd))
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gtk_widget_show (inputd);
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else
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gdk_window_raise (inputd->window);
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}
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}
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int
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main (int argc, char *argv[])
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{
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GtkWidget *window;
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GtkWidget *drawing_area;
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GtkWidget *vbox;
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GtkWidget *button;
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gtk_init (&argc, &argv);
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window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
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gtk_widget_set_name (window, "Test Input");
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vbox = gtk_vbox_new (FALSE, 0);
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gtk_container_add (GTK_CONTAINER (window), vbox);
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gtk_widget_show (vbox);
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g_signal_connect (window, "destroy",
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G_CALLBACK (gtk_main_quit), NULL);
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/* Create the drawing area */
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drawing_area = gtk_drawing_area_new ();
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gtk_widget_set_size_request (GTK_WIDGET (drawing_area), 200, 200);
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gtk_box_pack_start (GTK_BOX (vbox), drawing_area, TRUE, TRUE, 0);
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gtk_widget_show (drawing_area);
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/* Signals used to handle backing pixmap */
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g_signal_connect (drawing_area, "expose-event",
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G_CALLBACK (expose_event), NULL);
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g_signal_connect (drawing_area,"configure-event",
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G_CALLBACK (configure_event), NULL);
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/* Event signals */
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g_signal_connect (drawing_area, "motion-notify-event",
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G_CALLBACK (motion_notify_event), NULL);
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g_signal_connect (drawing_area, "button-press-event",
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G_CALLBACK (button_press_event), NULL);
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gtk_widget_set_events (drawing_area, GDK_EXPOSURE_MASK
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| GDK_LEAVE_NOTIFY_MASK
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| GDK_BUTTON_PRESS_MASK
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| GDK_POINTER_MOTION_MASK
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| GDK_POINTER_MOTION_HINT_MASK);
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/* The following call enables tracking and processing of extension
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events for the drawing area */
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gtk_widget_set_extension_events (drawing_area, GDK_EXTENSION_EVENTS_CURSOR);
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/* .. And some buttons */
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button = gtk_button_new_with_label ("Input Dialog");
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gtk_box_pack_start (GTK_BOX (vbox), button, FALSE, FALSE, 0);
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g_signal_connect (button, "clicked",
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G_CALLBACK (create_input_dialog), NULL);
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gtk_widget_show (button);
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button = gtk_button_new_with_label ("Quit");
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gtk_box_pack_start (GTK_BOX (vbox), button, FALSE, FALSE, 0);
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g_signal_connect_swapped (button, "clicked",
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G_CALLBACK (gtk_widget_destroy),
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window);
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gtk_widget_show (button);
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gtk_widget_show (window);
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gtk_main ();
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return 0;
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}
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