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-rw-r--r--app/display/gimpdisplayshell-autoscroll.c184
1 files changed, 184 insertions, 0 deletions
diff --git a/app/display/gimpdisplayshell-autoscroll.c b/app/display/gimpdisplayshell-autoscroll.c
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+++ b/app/display/gimpdisplayshell-autoscroll.c
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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;
+ }
+}