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diff --git a/app/display/gimptoolwidget.h b/app/display/gimptoolwidget.h
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+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimptoolwidget.h
+ * Copyright (C) 2017 Michael Natterer <mitch@gimp.org>
+ *
+ * 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/>.
+ */
+
+#ifndef __GIMP_TOOL_WIDGET_H__
+#define __GIMP_TOOL_WIDGET_H__
+
+
+#include "core/gimpobject.h"
+
+
+#define GIMP_TOOL_WIDGET_RESPONSE_CONFIRM -1
+#define GIMP_TOOL_WIDGET_RESPONSE_CANCEL -2
+#define GIMP_TOOL_WIDGET_RESPONSE_RESET -3
+
+
+#define GIMP_TYPE_TOOL_WIDGET (gimp_tool_widget_get_type ())
+#define GIMP_TOOL_WIDGET(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_TOOL_WIDGET, GimpToolWidget))
+#define GIMP_TOOL_WIDGET_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GIMP_TYPE_TOOL_WIDGET, GimpToolWidgetClass))
+#define GIMP_IS_TOOL_WIDGET(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GIMP_TYPE_TOOL_WIDGET))
+#define GIMP_IS_TOOL_WIDGET_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GIMP_TYPE_TOOL_WIDGET))
+#define GIMP_TOOL_WIDGET_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GIMP_TYPE_TOOL_WIDGET, GimpToolWidgetClass))
+
+
+typedef struct _GimpToolWidgetPrivate GimpToolWidgetPrivate;
+typedef struct _GimpToolWidgetClass GimpToolWidgetClass;
+
+struct _GimpToolWidget
+{
+ GimpObject parent_instance;
+
+ GimpToolWidgetPrivate *private;
+};
+
+struct _GimpToolWidgetClass
+{
+ GimpObjectClass parent_class;
+
+ /* signals */
+ void (* changed) (GimpToolWidget *widget);
+ void (* response) (GimpToolWidget *widget,
+ gint response_id);
+ void (* snap_offsets) (GimpToolWidget *widget,
+ gint offset_x,
+ gint offset_y,
+ gint width,
+ gint height);
+ void (* status) (GimpToolWidget *widget,
+ const gchar *status);
+ void (* status_coords) (GimpToolWidget *widget,
+ const gchar *title,
+ gdouble x,
+ const gchar *separator,
+ gdouble y,
+ const gchar *help);
+ void (* message) (GimpToolWidget *widget,
+ const gchar *message);
+ void (* focus_changed) (GimpToolWidget *widget);
+
+ /* virtual functions */
+ gint (* button_press) (GimpToolWidget *widget,
+ const GimpCoords *coords,
+ guint32 time,
+ GdkModifierType state,
+ GimpButtonPressType press_type);
+ void (* button_release) (GimpToolWidget *widget,
+ const GimpCoords *coords,
+ guint32 time,
+ GdkModifierType state,
+ GimpButtonReleaseType release_type);
+ void (* motion) (GimpToolWidget *widget,
+ const GimpCoords *coords,
+ guint32 time,
+ GdkModifierType state);
+
+ GimpHit (* hit) (GimpToolWidget *widget,
+ const GimpCoords *coords,
+ GdkModifierType state,
+ gboolean proximity);
+ void (* hover) (GimpToolWidget *widget,
+ const GimpCoords *coords,
+ GdkModifierType state,
+ gboolean proximity);
+ void (* leave_notify) (GimpToolWidget *widget);
+
+ gboolean (* key_press) (GimpToolWidget *widget,
+ GdkEventKey *kevent);
+ gboolean (* key_release) (GimpToolWidget *widget,
+ GdkEventKey *kevent);
+
+ void (* motion_modifier) (GimpToolWidget *widget,
+ GdkModifierType key,
+ gboolean press,
+ GdkModifierType state);
+ void (* hover_modifier) (GimpToolWidget *widget,
+ GdkModifierType key,
+ gboolean press,
+ GdkModifierType state);
+
+ gboolean (* get_cursor) (GimpToolWidget *widget,
+ const GimpCoords *coords,
+ GdkModifierType state,
+ GimpCursorType *cursor,
+ GimpToolCursorType *tool_cursor,
+ GimpCursorModifier *modifier);
+
+ gboolean update_on_scale;
+ gboolean update_on_scroll;
+ gboolean update_on_rotate;
+};
+
+
+GType gimp_tool_widget_get_type (void) G_GNUC_CONST;
+
+GimpDisplayShell * gimp_tool_widget_get_shell (GimpToolWidget *widget);
+GimpCanvasItem * gimp_tool_widget_get_item (GimpToolWidget *widget);
+
+void gimp_tool_widget_set_visible (GimpToolWidget *widget,
+ gboolean visible);
+gboolean gimp_tool_widget_get_visible (GimpToolWidget *widget);
+
+void gimp_tool_widget_set_focus (GimpToolWidget *widget,
+ gboolean focus);
+gboolean gimp_tool_widget_get_focus (GimpToolWidget *widget);
+
+/* for subclasses, to notify the handling tool
+ */
+void gimp_tool_widget_changed (GimpToolWidget *widget);
+
+void gimp_tool_widget_response (GimpToolWidget *widget,
+ gint response_id);
+
+void gimp_tool_widget_set_snap_offsets (GimpToolWidget *widget,
+ gint offset_x,
+ gint offset_y,
+ gint width,
+ gint height);
+void gimp_tool_widget_get_snap_offsets (GimpToolWidget *widget,
+ gint *offset_x,
+ gint *offset_y,
+ gint *width,
+ gint *height);
+
+void gimp_tool_widget_set_status (GimpToolWidget *widget,
+ const gchar *status);
+void gimp_tool_widget_set_status_coords (GimpToolWidget *widget,
+ const gchar *title,
+ gdouble x,
+ const gchar *separator,
+ gdouble y,
+ const gchar *help);
+
+void gimp_tool_widget_message (GimpToolWidget *widget,
+ const gchar *format,
+ ...) G_GNUC_PRINTF (2, 3);
+void gimp_tool_widget_message_literal (GimpToolWidget *widget,
+ const gchar *message);
+
+/* for subclasses, to add and manage their items
+ */
+void gimp_tool_widget_add_item (GimpToolWidget *widget,
+ GimpCanvasItem *item);
+void gimp_tool_widget_remove_item (GimpToolWidget *widget,
+ GimpCanvasItem *item);
+
+GimpCanvasGroup * gimp_tool_widget_add_group (GimpToolWidget *widget);
+GimpCanvasGroup * gimp_tool_widget_add_stroke_group (GimpToolWidget *widget);
+GimpCanvasGroup * gimp_tool_widget_add_fill_group (GimpToolWidget *widget);
+
+void gimp_tool_widget_push_group (GimpToolWidget *widget,
+ GimpCanvasGroup *group);
+void gimp_tool_widget_pop_group (GimpToolWidget *widget);
+
+/* for subclasses, convenience functions to add specific items
+ */
+GimpCanvasItem * gimp_tool_widget_add_line (GimpToolWidget *widget,
+ gdouble x1,
+ gdouble y1,
+ gdouble x2,
+ gdouble y2);
+GimpCanvasItem * gimp_tool_widget_add_rectangle (GimpToolWidget *widget,
+ gdouble x,
+ gdouble y,
+ gdouble width,
+ gdouble height,
+ gboolean filled);
+GimpCanvasItem * gimp_tool_widget_add_arc (GimpToolWidget *widget,
+ gdouble center_x,
+ gdouble center_y,
+ gdouble radius_x,
+ gdouble radius_y,
+ gdouble start_angle,
+ gdouble slice_angle,
+ gboolean filled);
+GimpCanvasItem * gimp_tool_widget_add_limit (GimpToolWidget *widget,
+ GimpLimitType type,
+ gdouble x,
+ gdouble y,
+ gdouble radius,
+ gdouble aspect_ratio,
+ gdouble angle,
+ gboolean dashed);
+GimpCanvasItem * gimp_tool_widget_add_polygon (GimpToolWidget *widget,
+ GimpMatrix3 *transform,
+ const GimpVector2 *points,
+ gint n_points,
+ gboolean filled);
+GimpCanvasItem * gimp_tool_widget_add_polygon_from_coords
+ (GimpToolWidget *widget,
+ GimpMatrix3 *transform,
+ const GimpCoords *points,
+ gint n_points,
+ gboolean filled);
+GimpCanvasItem * gimp_tool_widget_add_path (GimpToolWidget *widget,
+ const GimpBezierDesc *desc);
+
+GimpCanvasItem * gimp_tool_widget_add_handle (GimpToolWidget *widget,
+ GimpHandleType type,
+ gdouble x,
+ gdouble y,
+ gint width,
+ gint height,
+ GimpHandleAnchor anchor);
+GimpCanvasItem * gimp_tool_widget_add_corner (GimpToolWidget *widget,
+ gdouble x,
+ gdouble y,
+ gdouble width,
+ gdouble height,
+ GimpHandleAnchor anchor,
+ gint corner_width,
+ gint corner_height,
+ gboolean outside);
+
+GimpCanvasItem * gimp_tool_widget_add_rectangle_guides
+ (GimpToolWidget *widget,
+ gdouble x,
+ gdouble y,
+ gdouble width,
+ gdouble height,
+ GimpGuidesType type);
+GimpCanvasItem * gimp_tool_widget_add_transform_guides
+ (GimpToolWidget *widget,
+ const GimpMatrix3 *transform,
+ gdouble x1,
+ gdouble y1,
+ gdouble x2,
+ gdouble y2,
+ GimpGuidesType type,
+ gint n_guides,
+ gboolean clip);
+
+/* for tools, to be called from the respective GimpTool method
+ * implementations
+ */
+gint gimp_tool_widget_button_press (GimpToolWidget *widget,
+ const GimpCoords *coords,
+ guint32 time,
+ GdkModifierType state,
+ GimpButtonPressType press_type);
+void gimp_tool_widget_button_release (GimpToolWidget *widget,
+ const GimpCoords *coords,
+ guint32 time,
+ GdkModifierType state,
+ GimpButtonReleaseType release_type);
+void gimp_tool_widget_motion (GimpToolWidget *widget,
+ const GimpCoords *coords,
+ guint32 time,
+ GdkModifierType state);
+
+GimpHit gimp_tool_widget_hit (GimpToolWidget *widget,
+ const GimpCoords *coords,
+ GdkModifierType state,
+ gboolean proximity);
+void gimp_tool_widget_hover (GimpToolWidget *widget,
+ const GimpCoords *coords,
+ GdkModifierType state,
+ gboolean proximity);
+void gimp_tool_widget_leave_notify (GimpToolWidget *widget);
+
+gboolean gimp_tool_widget_key_press (GimpToolWidget *widget,
+ GdkEventKey *kevent);
+gboolean gimp_tool_widget_key_release (GimpToolWidget *widget,
+ GdkEventKey *kevent);
+
+void gimp_tool_widget_motion_modifier (GimpToolWidget *widget,
+ GdkModifierType key,
+ gboolean press,
+ GdkModifierType state);
+void gimp_tool_widget_hover_modifier (GimpToolWidget *widget,
+ GdkModifierType key,
+ gboolean press,
+ GdkModifierType state);
+
+gboolean gimp_tool_widget_get_cursor (GimpToolWidget *widget,
+ const GimpCoords *coords,
+ GdkModifierType state,
+ GimpCursorType *cursor,
+ GimpToolCursorType *tool_cursor,
+ GimpCursorModifier *modifier);
+
+
+#endif /* __GIMP_TOOL_WIDGET_H__ */
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