worldspawn/libs/gtkutil/cursor.cpp

/*
   Copyright (C) 2001-2006, William Joseph.
   All Rights Reserved.

   This file is part of GtkRadiant.

   GtkRadiant is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.

   GtkRadiant 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 General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with GtkRadiant; if not, write to the Free Software
   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

#include "cursor.h"

#include "stream/textstream.h"

#include <string.h>
#include <gdk/gdk.h>
#include <gtk/gtk.h>


GdkCursor *create_blank_cursor()
{
    return gdk_cursor_new(GDK_BLANK_CURSOR);
}

void blank_cursor(ui::Widget widget)
{
    GdkCursor *cursor = create_blank_cursor();
    gdk_window_set_cursor(gtk_widget_get_window(widget), cursor);
    gdk_cursor_unref(cursor);
}

void default_cursor(ui::Widget widget)
{
    gdk_window_set_cursor(gtk_widget_get_window(widget), 0);
}


void Sys_GetCursorPos(ui::Window window, int *x, int *y)
{
    gdk_display_get_pointer(gdk_display_get_default(), 0, x, y, 0);
}

void Sys_SetCursorPos(ui::Window window, int x, int y)
{
    GdkScreen *screen;
    gdk_display_get_pointer(gdk_display_get_default(), &screen, 0, 0, 0);
    gdk_display_warp_pointer(gdk_display_get_default(), screen, x, y);
}

gboolean DeferredMotion::gtk_motion(ui::Widget widget, GdkEventMotion *event, DeferredMotion *self)
{
    self->motion(event->x, event->y, event->state);
    return FALSE;
}

gboolean FreezePointer::motion_delta(ui::Window widget, GdkEventMotion *event, FreezePointer *self)
{
    int current_x, current_y;
    Sys_GetCursorPos(widget, &current_x, &current_y);
    int dx = current_x - self->last_x;
    int dy = current_y - self->last_y;
    int ddx = current_x - self->recorded_x;
    int ddy = current_y - self->recorded_y;
    self->last_x = current_x;
    self->last_y = current_y;
    if (dx != 0 || dy != 0) {
        //globalOutputStream() << "motion x: " << dx << ", y: " << dy << "\n";
        if (ddx < -32 || ddx > 32 || ddy < -32 || ddy > 32) {
            Sys_SetCursorPos(widget, self->recorded_x, self->recorded_y);
            self->last_x = self->recorded_x;
            self->last_y = self->recorded_y;
        }
        self->m_function(dx, dy, event->state, self->m_data);
    }
    return FALSE;
}

void FreezePointer::freeze_pointer(ui::Window window, FreezePointer::MotionDeltaFunction function, void *data)
{
    ASSERT_MESSAGE(m_function == 0, "can't freeze pointer");

    const GdkEventMask mask = static_cast<GdkEventMask>( GDK_POINTER_MOTION_MASK
                                                         | GDK_POINTER_MOTION_HINT_MASK
                                                         | GDK_BUTTON_MOTION_MASK
                                                         | GDK_BUTTON1_MOTION_MASK
                                                         | GDK_BUTTON2_MOTION_MASK
                                                         | GDK_BUTTON3_MOTION_MASK
                                                         | GDK_BUTTON_PRESS_MASK
                                                         | GDK_BUTTON_RELEASE_MASK
                                                         | GDK_VISIBILITY_NOTIFY_MASK );

    GdkCursor *cursor = create_blank_cursor();
    //GdkGrabStatus status =
    gdk_pointer_grab(gtk_widget_get_window(window), TRUE, mask, 0, cursor, GDK_CURRENT_TIME);
    gdk_cursor_unref(cursor);

    Sys_GetCursorPos(window, &recorded_x, &recorded_y);

    Sys_SetCursorPos(window, recorded_x, recorded_y);

    last_x = recorded_x;
    last_y = recorded_y;

    m_function = function;
    m_data = data;

    handle_motion = window.connect("motion_notify_event", G_CALLBACK(motion_delta), this);
}

void FreezePointer::unfreeze_pointer(ui::Window window)
{
    g_signal_handler_disconnect(G_OBJECT(window), handle_motion);

    m_function = 0;
    m_data = 0;

    Sys_SetCursorPos(window, recorded_x, recorded_y);

    gdk_pointer_ungrab(GDK_CURRENT_TIME);
}