Adding upstream version 2.10.34.upstream/2.10.34upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 554 insertions, 0 deletions

diff --git a/libgimpwidgets/gimpchainbutton.c b/libgimpwidgets/gimpchainbutton.c
new file mode 100644
index 0000000..83ee9f7
--- /dev/null
+++ b/libgimpwidgets/gimpchainbutton.c
@@ -0,0 +1,554 @@
+/* LIBGIMP - The GIMP Library
+ * Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball
+ *
+ * gimpchainbutton.c
+ * Copyright (C) 1999-2000 Sven Neumann <sven@gimp.org>
+ *
+ * This library is free software: you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library.  If not, see
+ * <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <gtk/gtk.h>
+
+#include "gimpwidgetstypes.h"
+
+#include "gimpchainbutton.h"
+#include "gimpicons.h"
+
+
+/**
+ * SECTION: gimpchainbutton
+ * @title: GimpChainButton
+ * @short_description: Widget to visually connect two entry widgets.
+ * @see_also: You may want to use the convenience function
+ *            gimp_coordinates_new() to set up two GimpSizeEntries
+ *            (see #GimpSizeEntry) linked with a #GimpChainButton.
+ *
+ * This widget provides a button showing either a linked or a broken
+ * chain that can be used to link two entries, spinbuttons, colors or
+ * other GUI elements and show that they may be locked. Use it for
+ * example to connect X and Y ratios to provide the possibility of a
+ * constrained aspect ratio.
+ *
+ * The #GimpChainButton only gives visual feedback, it does not really
+ * connect widgets. You have to take care of locking the values
+ * yourself by checking the state of the #GimpChainButton whenever a
+ * value changes in one of the connected widgets and adjusting the
+ * other value if necessary.
+ **/
+
+
+enum
+{
+  PROP_0,
+  PROP_POSITION,
+  PROP_ICON_SIZE,
+  PROP_ACTIVE
+};
+
+enum
+{
+  TOGGLED,
+  LAST_SIGNAL
+};
+
+static void      gimp_chain_button_constructed      (GObject         *object);
+static void      gimp_chain_button_set_property     (GObject         *object,
+                                                     guint            property_id,
+                                                     const GValue    *value,
+                                                     GParamSpec      *pspec);
+static void      gimp_chain_button_get_property     (GObject         *object,
+                                                     guint            property_id,
+                                                     GValue          *value,
+                                                     GParamSpec      *pspec);
+
+static void      gimp_chain_button_clicked_callback (GtkWidget       *widget,
+                                                     GimpChainButton *button);
+static void      gimp_chain_button_update_image     (GimpChainButton *button);
+
+static GtkWidget * gimp_chain_line_new            (GimpChainPosition  position,
+                                                   gint               which);
+
+
+G_DEFINE_TYPE (GimpChainButton, gimp_chain_button, GTK_TYPE_TABLE)
+
+#define parent_class gimp_chain_button_parent_class
+
+static guint gimp_chain_button_signals[LAST_SIGNAL] = { 0 };
+
+static const gchar * const gimp_chain_icon_names[] =
+{
+  GIMP_ICON_CHAIN_HORIZONTAL,
+  GIMP_ICON_CHAIN_HORIZONTAL_BROKEN,
+  GIMP_ICON_CHAIN_VERTICAL,
+  GIMP_ICON_CHAIN_VERTICAL_BROKEN
+};
+
+
+static void
+gimp_chain_button_class_init (GimpChainButtonClass *klass)
+{
+  GObjectClass *object_class = G_OBJECT_CLASS (klass);
+
+  object_class->constructed  = gimp_chain_button_constructed;
+  object_class->set_property = gimp_chain_button_set_property;
+  object_class->get_property = gimp_chain_button_get_property;
+
+  gimp_chain_button_signals[TOGGLED] =
+    g_signal_new ("toggled",
+                  G_TYPE_FROM_CLASS (klass),
+                  G_SIGNAL_RUN_FIRST,
+                  G_STRUCT_OFFSET (GimpChainButtonClass, toggled),
+                  NULL, NULL,
+                  g_cclosure_marshal_VOID__VOID,
+                  G_TYPE_NONE, 0);
+
+  klass->toggled = NULL;
+
+  /**
+   * GimpChainButton:position:
+   *
+   * The position in which the chain button will be used.
+   *
+   * Since: 2.4
+   */
+  g_object_class_install_property (object_class, PROP_POSITION,
+                                   g_param_spec_enum ("position",
+                                                      "Position",
+                                                      "The chain's position",
+                                                      GIMP_TYPE_CHAIN_POSITION,
+                                                      GIMP_CHAIN_TOP,
+                                                      G_PARAM_CONSTRUCT_ONLY |
+                                                      GIMP_PARAM_READWRITE));
+
+  /**
+   * GimpChainButton:icon-size:
+   *
+   * The chain button icon size.
+   *
+   * Since: 2.10.10
+   */
+  g_object_class_install_property (object_class, PROP_ICON_SIZE,
+                                   g_param_spec_enum ("icon-size",
+                                                      "Icon Size",
+                                                      "The chain's icon size",
+                                                      GTK_TYPE_ICON_SIZE,
+                                                      GTK_ICON_SIZE_BUTTON,
+                                                      G_PARAM_CONSTRUCT |
+                                                      GIMP_PARAM_READWRITE));
+
+  /**
+   * GimpChainButton:active:
+   *
+   * The toggled state of the chain button.
+   *
+   * Since: 2.10.10
+   */
+  g_object_class_install_property (object_class, PROP_ACTIVE,
+                                   g_param_spec_boolean ("active",
+                                                         "Active",
+                                                         "The chain's toggled state",
+                                                         FALSE,
+                                                         G_PARAM_CONSTRUCT |
+                                                         GIMP_PARAM_READWRITE));
+}
+
+static void
+gimp_chain_button_init (GimpChainButton *button)
+{
+  button->position = GIMP_CHAIN_TOP;
+  button->active   = FALSE;
+  button->image    = gtk_image_new ();
+  button->button   = gtk_button_new ();
+
+  gtk_button_set_relief (GTK_BUTTON (button->button), GTK_RELIEF_NONE);
+  gtk_container_add (GTK_CONTAINER (button->button), button->image);
+  gtk_widget_show (button->image);
+
+  g_signal_connect (button->button, "clicked",
+                    G_CALLBACK (gimp_chain_button_clicked_callback),
+                    button);
+}
+
+static void
+gimp_chain_button_constructed (GObject *object)
+{
+  GimpChainButton *button = GIMP_CHAIN_BUTTON (object);
+
+  G_OBJECT_CLASS (parent_class)->constructed (object);
+
+  button->line1 = gimp_chain_line_new (button->position, 1);
+  button->line2 = gimp_chain_line_new (button->position, -1);
+
+  gimp_chain_button_update_image (button);
+
+  if (button->position & GIMP_CHAIN_LEFT) /* are we a vertical chainbutton? */
+    {
+      gtk_table_resize (GTK_TABLE (button), 3, 1);
+      gtk_table_attach (GTK_TABLE (button), button->button, 0, 1, 1, 2,
+                        GTK_SHRINK, GTK_SHRINK, 0, 0);
+      gtk_table_attach_defaults (GTK_TABLE (button),
+                                 button->line1, 0, 1, 0, 1);
+      gtk_table_attach_defaults (GTK_TABLE (button),
+                                 button->line2, 0, 1, 2, 3);
+    }
+  else
+    {
+      gtk_table_resize (GTK_TABLE (button), 1, 3);
+      gtk_table_attach (GTK_TABLE (button), button->button, 1, 2, 0, 1,
+                        GTK_SHRINK, GTK_SHRINK, 0, 0);
+      gtk_table_attach_defaults (GTK_TABLE (button),
+                                 button->line1, 0, 1, 0, 1);
+      gtk_table_attach_defaults (GTK_TABLE (button),
+                                 button->line2, 2, 3, 0, 1);
+    }
+
+  gtk_widget_show (button->button);
+  gtk_widget_show (button->line1);
+  gtk_widget_show (button->line2);
+}
+
+static void
+gimp_chain_button_set_property (GObject      *object,
+                                guint         property_id,
+                                const GValue *value,
+                                GParamSpec   *pspec)
+{
+  GimpChainButton *button = GIMP_CHAIN_BUTTON (object);
+
+  switch (property_id)
+    {
+    case PROP_POSITION:
+      button->position = g_value_get_enum (value);
+      break;
+
+    case PROP_ICON_SIZE:
+      g_object_set_property (G_OBJECT (button->image), "icon-size", value);
+      break;
+
+    case PROP_ACTIVE:
+      gimp_chain_button_set_active (button, g_value_get_boolean (value));
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+    }
+}
+
+static void
+gimp_chain_button_get_property (GObject    *object,
+                                guint       property_id,
+                                GValue     *value,
+                                GParamSpec *pspec)
+{
+  GimpChainButton *button = GIMP_CHAIN_BUTTON (object);
+
+  switch (property_id)
+    {
+    case PROP_POSITION:
+      g_value_set_enum (value, button->position);
+      break;
+
+    case PROP_ICON_SIZE:
+      g_object_get_property (G_OBJECT (button->image), "icon-size", value);
+      break;
+
+    case PROP_ACTIVE:
+      g_value_set_boolean (value, gimp_chain_button_get_active (button));
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+    }
+}
+
+/**
+ * gimp_chain_button_new:
+ * @position: The position you are going to use for the button
+ *            with respect to the widgets you want to chain.
+ *
+ * Creates a new #GimpChainButton widget.
+ *
+ * This returns a button showing either a broken or a linked chain and
+ * small clamps attached to both sides that visually group the two widgets
+ * you want to connect. This widget looks best when attached
+ * to a table taking up two columns (or rows respectively) next
+ * to the widgets that it is supposed to connect. It may work
+ * for more than two widgets, but the look is optimized for two.
+ *
+ * Returns: Pointer to the new #GimpChainButton, which is inactive
+ *          by default. Use gimp_chain_button_set_active() to
+ *          change its state.
+ */
+GtkWidget *
+gimp_chain_button_new (GimpChainPosition position)
+{
+  return g_object_new (GIMP_TYPE_CHAIN_BUTTON,
+                       "position", position,
+                       NULL);
+}
+
+/**
+ * gimp_chain_button_set_icon_size:
+ * @button: Pointer to a #GimpChainButton.
+ * @size: The new icon size.
+ *
+ * Sets the icon size of the #GimpChainButton.
+ *
+ * Since: 2.10.10
+ */
+void
+gimp_chain_button_set_icon_size (GimpChainButton *button,
+                                 GtkIconSize      size)
+{
+  g_return_if_fail (GIMP_IS_CHAIN_BUTTON (button));
+
+  g_object_set (button,
+                "icon-size", size,
+                NULL);
+}
+
+/**
+ * gimp_chain_button_get_icon_size:
+ * @button: Pointer to a #GimpChainButton.
+ *
+ * Gets the icon size of the #GimpChainButton.
+ *
+ * Returns: The icon size.
+ *
+ * Since: 2.10.10
+ */
+GtkIconSize
+gimp_chain_button_get_icon_size (GimpChainButton *button)
+{
+  GtkIconSize size;
+
+  g_return_val_if_fail (GIMP_IS_CHAIN_BUTTON (button), GTK_ICON_SIZE_BUTTON);
+
+  g_object_get (button,
+                "icon-size", &size,
+                NULL);
+
+  return size;
+}
+
+/**
+ * gimp_chain_button_set_active:
+ * @button: Pointer to a #GimpChainButton.
+ * @active: The new state.
+ *
+ * Sets the state of the #GimpChainButton to be either locked (%TRUE) or
+ * unlocked (%FALSE) and changes the showed pixmap to reflect the new state.
+ */
+void
+gimp_chain_button_set_active (GimpChainButton  *button,
+                              gboolean          active)
+{
+  g_return_if_fail (GIMP_IS_CHAIN_BUTTON (button));
+
+  if (button->active != active)
+    {
+      button->active = active ? TRUE : FALSE;
+
+      gimp_chain_button_update_image (button);
+
+      g_signal_emit (button, gimp_chain_button_signals[TOGGLED], 0);
+
+      g_object_notify (G_OBJECT (button), "active");
+    }
+}
+
+/**
+ * gimp_chain_button_get_active
+ * @button: Pointer to a #GimpChainButton.
+ *
+ * Checks the state of the #GimpChainButton.
+ *
+ * Returns: %TRUE if the #GimpChainButton is active (locked).
+ */
+gboolean
+gimp_chain_button_get_active (GimpChainButton *button)
+{
+  g_return_val_if_fail (GIMP_IS_CHAIN_BUTTON (button), FALSE);
+
+  return button->active;
+}
+
+static void
+gimp_chain_button_clicked_callback (GtkWidget       *widget,
+                                    GimpChainButton *button)
+{
+  gimp_chain_button_set_active (button, ! button->active);
+}
+
+static void
+gimp_chain_button_update_image (GimpChainButton *button)
+{
+  guint i;
+
+  i = ((button->position & GIMP_CHAIN_LEFT) << 1) + (button->active ? 0 : 1);
+
+  gtk_image_set_from_icon_name (GTK_IMAGE (button->image),
+                                gimp_chain_icon_names[i],
+                                gimp_chain_button_get_icon_size (button));
+}
+
+
+/* GimpChainLine is a simple no-window widget for drawing the lines.
+ *
+ * Originally this used to be a GtkDrawingArea but this turned out to
+ * be a bad idea. We don't need an extra window to draw on and we also
+ * don't need any input events.
+ */
+
+static GType     gimp_chain_line_get_type     (void) G_GNUC_CONST;
+static gboolean  gimp_chain_line_expose_event (GtkWidget       *widget,
+                                               GdkEventExpose  *event);
+
+struct _GimpChainLine
+{
+  GtkWidget          parent_instance;
+  GimpChainPosition  position;
+  gint               which;
+};
+
+typedef struct _GimpChainLine  GimpChainLine;
+typedef GtkWidgetClass         GimpChainLineClass;
+
+G_DEFINE_TYPE (GimpChainLine, gimp_chain_line, GTK_TYPE_WIDGET)
+
+static void
+gimp_chain_line_class_init (GimpChainLineClass *klass)
+{
+  GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
+
+  widget_class->expose_event = gimp_chain_line_expose_event;
+}
+
+static void
+gimp_chain_line_init (GimpChainLine *line)
+{
+  gtk_widget_set_has_window (GTK_WIDGET (line), FALSE);
+}
+
+static GtkWidget *
+gimp_chain_line_new (GimpChainPosition  position,
+                     gint               which)
+{
+  GimpChainLine *line = g_object_new (gimp_chain_line_get_type (), NULL);
+
+  line->position = position;
+  line->which    = which;
+
+  return GTK_WIDGET (line);
+}
+
+static gboolean
+gimp_chain_line_expose_event (GtkWidget      *widget,
+                              GdkEventExpose *event)
+{
+  GtkStyle          *style = gtk_widget_get_style (widget);
+  GimpChainLine     *line  = ((GimpChainLine *) widget);
+  GtkAllocation      allocation;
+  GdkPoint           points[3];
+  GimpChainPosition  position;
+  cairo_t           *cr;
+
+  gtk_widget_get_allocation (widget, &allocation);
+
+  cr = gdk_cairo_create (gtk_widget_get_window (widget));
+  gdk_cairo_region (cr, event->region);
+  cairo_translate (cr, allocation.x, allocation.y);
+  cairo_clip (cr);
+
+#define SHORT_LINE 4
+  points[0].x = allocation.width  / 2;
+  points[0].y = allocation.height / 2;
+
+  position = line->position;
+
+  if (gtk_widget_get_direction (widget) == GTK_TEXT_DIR_RTL)
+    {
+      switch (position)
+        {
+        case GIMP_CHAIN_TOP:
+        case GIMP_CHAIN_BOTTOM:
+          break;
+
+        case GIMP_CHAIN_LEFT:
+          position = GIMP_CHAIN_RIGHT;
+          break;
+
+        case GIMP_CHAIN_RIGHT:
+          position = GIMP_CHAIN_LEFT;
+          break;
+        }
+    }
+
+  switch (position)
+    {
+    case GIMP_CHAIN_LEFT:
+      points[0].x += SHORT_LINE;
+      points[1].x = points[0].x - SHORT_LINE;
+      points[1].y = points[0].y;
+      points[2].x = points[1].x;
+      points[2].y = (line->which == 1 ? allocation.height - 1 : 0);
+      break;
+
+    case GIMP_CHAIN_RIGHT:
+      points[0].x -= SHORT_LINE;
+      points[1].x = points[0].x + SHORT_LINE;
+      points[1].y = points[0].y;
+      points[2].x = points[1].x;
+      points[2].y = (line->which == 1 ? allocation.height - 1 : 0);
+      break;
+
+    case GIMP_CHAIN_TOP:
+      points[0].y += SHORT_LINE;
+      points[1].x = points[0].x;
+      points[1].y = points[0].y - SHORT_LINE;
+      points[2].x = (line->which == 1 ? allocation.width - 1 : 0);
+      points[2].y = points[1].y;
+      break;
+
+    case GIMP_CHAIN_BOTTOM:
+      points[0].y -= SHORT_LINE;
+      points[1].x = points[0].x;
+      points[1].y = points[0].y + SHORT_LINE;
+      points[2].x = (line->which == 1 ? allocation.width - 1 : 0);
+      points[2].y = points[1].y;
+      break;
+
+    default:
+      return FALSE;
+    }
+
+  cairo_move_to (cr, points[0].x, points[0].y);
+  cairo_line_to (cr, points[1].x, points[1].y);
+  cairo_line_to (cr, points[2].x, points[2].y);
+
+  cairo_set_line_width (cr, 2.0);
+  cairo_set_line_cap (cr, CAIRO_LINE_CAP_BUTT);
+  gdk_cairo_set_source_color (cr, &style->fg[GTK_STATE_NORMAL]);
+
+  cairo_stroke (cr);
+
+  cairo_destroy (cr);
+
+  return TRUE;
+}