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Diffstat (limited to '')
| -rw-r--r-- | app/display/gimpdisplayshell-autoscroll.c | 184 |
1 files changed, 184 insertions, 0 deletions
diff --git a/app/display/gimpdisplayshell-autoscroll.c b/app/display/gimpdisplayshell-autoscroll.c new file mode 100644 index 0000000..39cf252 --- /dev/null +++ b/app/display/gimpdisplayshell-autoscroll.c @@ -0,0 +1,184 @@ +/* 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; + } +} |