mirror of
https://gitlab.gnome.org/GNOME/gtk.git
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394 lines
9.8 KiB
C
394 lines
9.8 KiB
C
/* 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 Free
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* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include "gtk.h"
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/* Backing pixmap for drawing area */
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static GdkPixmap *pixmap = NULL;
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/* Information about cursor */
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static gint need_cursor = FALSE;
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static gint cursor_proximity = TRUE;
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static gdouble cursor_x;
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static gdouble cursor_y;
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/* Unique ID of current device */
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static guint32 current_device = GDK_CORE_POINTER;
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/* Check to see if we need to draw a cursor for current device */
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static void
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check_cursor ()
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{
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GList *tmp_list;
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/* gdk_input_list_devices returns an internal list, so we shouldn't
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free it afterwards */
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tmp_list = gdk_input_list_devices();
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while (tmp_list)
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{
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GdkDeviceInfo *info = (GdkDeviceInfo *)tmp_list->data;
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if (info->deviceid == current_device)
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{
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need_cursor = !info->has_cursor;
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break;
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}
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tmp_list = tmp_list->next;
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}
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}
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/* Erase the old cursor, and/or draw a new one, if necessary */
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static void
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update_cursor (GtkWidget *widget, gdouble x, gdouble y)
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{
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static gint cursor_present = 0;
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gint state = need_cursor && cursor_proximity;
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if (pixmap != NULL)
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{
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if (cursor_present && (cursor_present != state ||
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x != cursor_x || y != cursor_y))
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{
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gdk_draw_pixmap(widget->window,
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widget->style->fg_gc[GTK_WIDGET_STATE (widget)],
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pixmap,
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cursor_x - 5, cursor_y - 5,
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cursor_x - 5, cursor_y - 5,
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10, 10);
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}
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cursor_present = state;
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cursor_x = x;
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cursor_y = y;
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if (cursor_present)
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{
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gdk_draw_rectangle (widget->window,
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widget->style->black_gc,
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TRUE,
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cursor_x - 5, cursor_y -5,
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10, 10);
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}
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}
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}
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/* Create a new backing pixmap of the appropriate size */
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static gint
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configure_event (GtkWidget *widget, GdkEventConfigure *event)
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{
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if (pixmap)
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gdk_pixmap_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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/* Refill the screen from the backing pixmap */
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static gint
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expose_event (GtkWidget *widget, GdkEventExpose *event)
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{
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gdk_draw_pixmap(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_draw (widget, &update_rect);
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}
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static guint32 motion_time;
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static gint
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button_press_event (GtkWidget *widget, GdkEventButton *event)
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{
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if (event->deviceid != current_device)
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{
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current_device = event->deviceid;
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check_cursor ();
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}
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cursor_proximity = TRUE;
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if (event->button == 1 && pixmap != NULL)
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{
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draw_brush (widget, event->source, event->x, event->y,
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event->pressure);
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motion_time = event->time;
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}
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update_cursor (widget, event->x, event->y);
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return TRUE;
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}
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static gint
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key_press_event (GtkWidget *widget, GdkEventKey *event)
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{
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if ((event->keyval >= 0x20) && (event->keyval <= 0xFF))
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printf("I got a %c\n", event->keyval);
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else
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printf("I got some other key\n");
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return TRUE;
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}
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static gint
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motion_notify_event (GtkWidget *widget, GdkEventMotion *event)
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{
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GdkTimeCoord *coords;
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int nevents;
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int i;
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if (event->deviceid != current_device)
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{
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current_device = event->deviceid;
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check_cursor ();
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}
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cursor_proximity = TRUE;
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if (event->state & GDK_BUTTON1_MASK && pixmap != NULL)
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{
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coords = gdk_input_motion_events (event->window, event->deviceid,
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motion_time, event->time,
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&nevents);
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motion_time = event->time;
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if (coords)
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{
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for (i=0; i<nevents; i++)
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draw_brush (widget, event->source, coords[i].x, coords[i].y,
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coords[i].pressure);
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g_free (coords);
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}
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else
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{
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if (event->is_hint)
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gdk_input_window_get_pointer (event->window, event->deviceid,
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NULL, NULL, NULL, NULL, NULL, NULL);
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draw_brush (widget, event->source, event->x, event->y,
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event->pressure);
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}
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}
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else
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{
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gdk_input_window_get_pointer (event->window, event->deviceid,
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&event->x, &event->y,
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NULL, NULL, NULL, NULL);
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}
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update_cursor (widget, event->x, event->y);
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return TRUE;
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}
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/* We track the next two events to know when we need to draw a
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cursor */
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static gint
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proximity_out_event (GtkWidget *widget, GdkEventProximity *event)
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{
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cursor_proximity = FALSE;
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update_cursor (widget, cursor_x, cursor_y);
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return TRUE;
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}
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static gint
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leave_notify_event (GtkWidget *widget, GdkEventCrossing *event)
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{
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cursor_proximity = FALSE;
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update_cursor (widget, cursor_x, cursor_y);
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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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gtk_signal_connect (GTK_OBJECT(inputd), "destroy",
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(GtkSignalFunc)input_dialog_destroy, &inputd);
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gtk_signal_connect_object (GTK_OBJECT(GTK_INPUT_DIALOG(inputd)->close_button),
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"clicked",
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(GtkSignalFunc)gtk_widget_hide,
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GTK_OBJECT(inputd));
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gtk_widget_hide ( GTK_INPUT_DIALOG(inputd)->save_button);
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gtk_signal_connect (GTK_OBJECT(inputd), "enable_device",
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(GtkSignalFunc)check_cursor, NULL);
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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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void
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quit ()
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{
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gtk_exit (0);
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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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gtk_signal_connect (GTK_OBJECT (window), "destroy",
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GTK_SIGNAL_FUNC (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_drawing_area_size (GTK_DRAWING_AREA (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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gtk_signal_connect (GTK_OBJECT (drawing_area), "expose_event",
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(GtkSignalFunc) expose_event, NULL);
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gtk_signal_connect (GTK_OBJECT(drawing_area),"configure_event",
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(GtkSignalFunc) configure_event, NULL);
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/* Event signals */
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gtk_signal_connect (GTK_OBJECT (drawing_area), "motion_notify_event",
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(GtkSignalFunc) motion_notify_event, NULL);
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gtk_signal_connect (GTK_OBJECT (drawing_area), "button_press_event",
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(GtkSignalFunc) button_press_event, NULL);
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gtk_signal_connect (GTK_OBJECT (drawing_area), "key_press_event",
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(GtkSignalFunc) key_press_event, NULL);
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gtk_signal_connect (GTK_OBJECT (drawing_area), "leave_notify_event",
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(GtkSignalFunc) leave_notify_event, NULL);
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gtk_signal_connect (GTK_OBJECT (drawing_area), "proximity_out_event",
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(GtkSignalFunc) proximity_out_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_KEY_PRESS_MASK
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| GDK_POINTER_MOTION_MASK
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| GDK_POINTER_MOTION_HINT_MASK
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| GDK_PROXIMITY_OUT_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_ALL);
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gtk_widget_grab_focus (drawing_area);
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/* .. And create 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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gtk_signal_connect (GTK_OBJECT (button), "clicked",
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GTK_SIGNAL_FUNC (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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gtk_signal_connect_object (GTK_OBJECT (button), "clicked",
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GTK_SIGNAL_FUNC (gtk_widget_destroy),
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GTK_OBJECT (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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