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Diffstat (limited to 'examples/scribble-xinput/scribble-xinput.c')
| -rw-r--r-- | examples/scribble-xinput/scribble-xinput.c | 270 |
1 files changed, 270 insertions, 0 deletions
diff --git a/examples/scribble-xinput/scribble-xinput.c b/examples/scribble-xinput/scribble-xinput.c new file mode 100644 index 000000000..81d4e6423 --- /dev/null +++ b/examples/scribble-xinput/scribble-xinput.c @@ -0,0 +1,270 @@ +/* example-start scribble-xinput scribble-xinput.c */ + +/* GTK - The GIMP Toolkit + * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Library General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This library 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 + * Library General Public License for more details. + * + * You should have received a copy of the GNU Library General Public + * License along with this library; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 02111-1307, USA. + */ + +#include <gtk/gtk.h> + +/* Backing pixmap for drawing area */ +static GdkPixmap *pixmap = NULL; + +/* Create a new backing pixmap of the appropriate size */ +static gint +configure_event (GtkWidget *widget, GdkEventConfigure *event) +{ + if (pixmap) + gdk_pixmap_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; +} + +/* Redraw the screen from the backing pixmap */ +static gint +expose_event (GtkWidget *widget, GdkEventExpose *event) +{ + gdk_draw_pixmap(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; +} + +/* Draw a rectangle on the screen, size depending on pressure, + and color on the type of device */ +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_draw (widget, &update_rect); +} + +static void +print_button_press (guint32 deviceid) +{ + GList *tmp_list; + + /* gdk_input_list_devices returns an internal list, so we shouldn't + free it afterwards */ + tmp_list = gdk_input_list_devices(); + + while (tmp_list) + { + GdkDeviceInfo *info = (GdkDeviceInfo *)tmp_list->data; + + if (info->deviceid == deviceid) + { + g_print("Button press on device '%s'\n", info->name); + return; + } + + tmp_list = tmp_list->next; + } +} + +static gint +button_press_event (GtkWidget *widget, GdkEventButton *event) +{ + print_button_press (event->deviceid); + + if (event->button == 1 && pixmap != NULL) + draw_brush (widget, event->source, event->x, event->y, event->pressure); + + return TRUE; +} + +static gint +motion_notify_event (GtkWidget *widget, GdkEventMotion *event) +{ + gdouble x, y; + gdouble pressure; + GdkModifierType state; + + if (event->is_hint) + gdk_input_window_get_pointer (event->window, event->deviceid, + &x, &y, &pressure, + NULL, NULL, &state); + else + { + x = event->x; + y = event->y; + pressure = event->pressure; + state = event->state; + } + + if (state & GDK_BUTTON1_MASK && pixmap != NULL) + draw_brush (widget, event->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(); + + gtk_signal_connect (GTK_OBJECT(inputd), "destroy", + (GtkSignalFunc)input_dialog_destroy, &inputd); + gtk_signal_connect_object (GTK_OBJECT(GTK_INPUT_DIALOG(inputd)->close_button), + "clicked", + (GtkSignalFunc)gtk_widget_hide, + GTK_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 +quit () +{ + gtk_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); + + gtk_signal_connect (GTK_OBJECT (window), "destroy", + GTK_SIGNAL_FUNC (quit), NULL); + + /* Create the drawing area */ + + drawing_area = gtk_drawing_area_new (); + gtk_drawing_area_size (GTK_DRAWING_AREA (drawing_area), 200, 200); + gtk_box_pack_start (GTK_BOX (vbox), drawing_area, TRUE, TRUE, 0); + + gtk_widget_show (drawing_area); + + /* Signals used to handle backing pixmap */ + + gtk_signal_connect (GTK_OBJECT (drawing_area), "expose_event", + (GtkSignalFunc) expose_event, NULL); + gtk_signal_connect (GTK_OBJECT(drawing_area),"configure_event", + (GtkSignalFunc) configure_event, NULL); + + /* Event signals */ + + gtk_signal_connect (GTK_OBJECT (drawing_area), "motion_notify_event", + (GtkSignalFunc) motion_notify_event, NULL); + gtk_signal_connect (GTK_OBJECT (drawing_area), "button_press_event", + (GtkSignalFunc) 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); + + /* The following call enables tracking and processing of extension + events for the drawing area */ + gtk_widget_set_extension_events (drawing_area, GDK_EXTENSION_EVENTS_CURSOR); + + /* .. And some buttons */ + button = gtk_button_new_with_label ("Input Dialog"); + gtk_box_pack_start (GTK_BOX (vbox), button, FALSE, FALSE, 0); + + gtk_signal_connect (GTK_OBJECT (button), "clicked", + GTK_SIGNAL_FUNC (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); + + gtk_signal_connect_object (GTK_OBJECT (button), "clicked", + GTK_SIGNAL_FUNC (gtk_widget_destroy), + GTK_OBJECT (window)); + gtk_widget_show (button); + + gtk_widget_show (window); + + gtk_main (); + + return 0; +} +/* example-end */ |