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/* GIMP - The GNU Image Manipulation Program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* This program 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 3 of the License, or
* (at your option) any later version.
*
* This program 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 this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <gegl.h>
#include <gtk/gtk.h>
#include "display-types.h"
#include "widgets/gimpdeviceinfo.h"
#include "widgets/gimpdeviceinfo-coords.h"
#include "gimpdisplay.h"
#include "gimpdisplayshell.h"
#include "gimpdisplayshell-autoscroll.h"
#include "gimpdisplayshell-scroll.h"
#include "gimpdisplayshell-transform.h"
#include "tools/tools-types.h"
#include "tools/tool_manager.h"
#include "tools/gimptool.h"
#include "tools/gimptoolcontrol.h"
#define AUTOSCROLL_DT 20
#define AUTOSCROLL_DX 0.1
typedef struct
{
GdkEventMotion *mevent;
GimpDeviceInfo *device;
guint32 time;
GdkModifierType state;
guint timeout_id;
} ScrollInfo;
/* local function prototypes */
static gboolean gimp_display_shell_autoscroll_timeout (gpointer data);
/* public functions */
void
gimp_display_shell_autoscroll_start (GimpDisplayShell *shell,
GdkModifierType state,
GdkEventMotion *mevent)
{
ScrollInfo *info;
g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
if (shell->scroll_info)
return;
info = g_slice_new0 (ScrollInfo);
info->mevent = mevent;
info->device = gimp_device_info_get_by_device (mevent->device);
info->time = gdk_event_get_time ((GdkEvent *) mevent);
info->state = state;
info->timeout_id = g_timeout_add (AUTOSCROLL_DT,
gimp_display_shell_autoscroll_timeout,
shell);
shell->scroll_info = info;
}
void
gimp_display_shell_autoscroll_stop (GimpDisplayShell *shell)
{
ScrollInfo *info;
g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
if (! shell->scroll_info)
return;
info = shell->scroll_info;
if (info->timeout_id)
{
g_source_remove (info->timeout_id);
info->timeout_id = 0;
}
g_slice_free (ScrollInfo, info);
shell->scroll_info = NULL;
}
/* private functions */
static gboolean
gimp_display_shell_autoscroll_timeout (gpointer data)
{
GimpDisplayShell *shell = GIMP_DISPLAY_SHELL (data);
ScrollInfo *info = shell->scroll_info;
GimpCoords device_coords;
GimpCoords image_coords;
gint dx = 0;
gint dy = 0;
gimp_device_info_get_device_coords (info->device,
gtk_widget_get_window (shell->canvas),
&device_coords);
if (device_coords.x < 0)
dx = device_coords.x;
else if (device_coords.x > shell->disp_width)
dx = device_coords.x - shell->disp_width;
if (device_coords.y < 0)
dy = device_coords.y;
else if (device_coords.y > shell->disp_height)
dy = device_coords.y - shell->disp_height;
if (dx || dy)
{
GimpDisplay *display = shell->display;
GimpTool *active_tool = tool_manager_get_active (display->gimp);
gint scroll_amount_x = AUTOSCROLL_DX * dx;
gint scroll_amount_y = AUTOSCROLL_DX * dy;
info->time += AUTOSCROLL_DT;
gimp_display_shell_scroll_unoverscrollify (shell,
scroll_amount_x,
scroll_amount_y,
&scroll_amount_x,
&scroll_amount_y);
gimp_display_shell_scroll (shell,
scroll_amount_x,
scroll_amount_y);
gimp_display_shell_untransform_coords (shell,
&device_coords,
&image_coords);
if (gimp_tool_control_get_snap_to (active_tool->control))
{
gint x, y, width, height;
gimp_tool_control_get_snap_offsets (active_tool->control,
&x, &y, &width, &height);
gimp_display_shell_snap_coords (shell,
&image_coords,
x, y, width, height);
}
tool_manager_motion_active (display->gimp,
&image_coords,
info->time, info->state,
display);
return TRUE;
}
else
{
g_slice_free (ScrollInfo, info);
shell->scroll_info = NULL;
return FALSE;
}
}
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