/* GTK - The GIMP Toolkit * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald * * GtkAspectFrame: Ensure that the child window has a specified aspect ratio * or, if obey_child, has the same aspect ratio as its requested size * * Copyright Owen Taylor 4/9/97 * * 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 2 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 * Lesser 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, write to the * Free Software Foundation, Inc., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, USA. */ /* * Modified by the GTK+ Team and others 1997-2001. See the AUTHORS * file for a list of people on the GTK+ Team. See the ChangeLog * files for a list of changes. These files are distributed with * GTK+ at ftp://ftp.gtk.org/pub/gtk/. */ #include #include "gtkaspectframe.h" #include "gtkintl.h" #include "gtkalias.h" enum { PROP_0, PROP_XALIGN, PROP_YALIGN, PROP_RATIO, PROP_OBEY_CHILD }; static void gtk_aspect_frame_class_init (GtkAspectFrameClass *klass); static void gtk_aspect_frame_init (GtkAspectFrame *aspect_frame); static void gtk_aspect_frame_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec); static void gtk_aspect_frame_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec); static void gtk_aspect_frame_compute_child_allocation (GtkFrame *frame, GtkAllocation *child_allocation); #define MAX_RATIO 10000.0 #define MIN_RATIO 0.0001 static GtkFrameClass *parent_class = NULL; GType gtk_aspect_frame_get_type (void) { static GType aspect_frame_type = 0; if (!aspect_frame_type) { static const GTypeInfo aspect_frame_info = { sizeof (GtkAspectFrameClass), NULL, /* base_init */ NULL, /* base_finalize */ (GClassInitFunc) gtk_aspect_frame_class_init, NULL, /* class_finalize */ NULL, /* class_data */ sizeof (GtkAspectFrame), 0, /* n_preallocs */ (GInstanceInitFunc) gtk_aspect_frame_init, }; aspect_frame_type = g_type_register_static (GTK_TYPE_FRAME, "GtkAspectFrame", &aspect_frame_info, 0); } return aspect_frame_type; } static void gtk_aspect_frame_class_init (GtkAspectFrameClass *class) { GObjectClass *gobject_class; GtkFrameClass *frame_class; parent_class = g_type_class_peek_parent (class); gobject_class = (GObjectClass*) class; frame_class = (GtkFrameClass*) class; gobject_class->set_property = gtk_aspect_frame_set_property; gobject_class->get_property = gtk_aspect_frame_get_property; frame_class->compute_child_allocation = gtk_aspect_frame_compute_child_allocation; #define STATIC_STRINGS G_PARAM_STATIC_NAME|G_PARAM_STATIC_NICK|G_PARAM_STATIC_BLURB g_object_class_install_property (gobject_class, PROP_XALIGN, g_param_spec_float ("xalign", P_("Horizontal Alignment"), P_("X alignment of the child"), 0.0, 1.0, 0.5, G_PARAM_READWRITE | STATIC_STRINGS)); g_object_class_install_property (gobject_class, PROP_YALIGN, g_param_spec_float ("yalign", P_("Vertical Alignment"), P_("Y alignment of the child"), 0.0, 1.0, 0.5, G_PARAM_READWRITE | STATIC_STRINGS)); g_object_class_install_property (gobject_class, PROP_RATIO, g_param_spec_float ("ratio", P_("Ratio"), P_("Aspect ratio if obey_child is FALSE"), MIN_RATIO, MAX_RATIO, 0.5, G_PARAM_READWRITE | STATIC_STRINGS)); g_object_class_install_property (gobject_class, PROP_OBEY_CHILD, g_param_spec_boolean ("obey-child", P_("Obey child"), P_("Force aspect ratio to match that of the frame's child"), TRUE, G_PARAM_READWRITE | STATIC_STRINGS)); } static void gtk_aspect_frame_init (GtkAspectFrame *aspect_frame) { aspect_frame->xalign = 0.5; aspect_frame->yalign = 0.5; aspect_frame->ratio = 1.0; aspect_frame->obey_child = TRUE; } static void gtk_aspect_frame_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec) { GtkAspectFrame *aspect_frame = GTK_ASPECT_FRAME (object); switch (prop_id) { /* g_object_notify is handled by the _frame_set function */ case PROP_XALIGN: gtk_aspect_frame_set (aspect_frame, g_value_get_float (value), aspect_frame->yalign, aspect_frame->ratio, aspect_frame->obey_child); break; case PROP_YALIGN: gtk_aspect_frame_set (aspect_frame, aspect_frame->xalign, g_value_get_float (value), aspect_frame->ratio, aspect_frame->obey_child); break; case PROP_RATIO: gtk_aspect_frame_set (aspect_frame, aspect_frame->xalign, aspect_frame->yalign, g_value_get_float (value), aspect_frame->obey_child); break; case PROP_OBEY_CHILD: gtk_aspect_frame_set (aspect_frame, aspect_frame->xalign, aspect_frame->yalign, aspect_frame->ratio, g_value_get_boolean (value)); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static void gtk_aspect_frame_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec) { GtkAspectFrame *aspect_frame = GTK_ASPECT_FRAME (object); switch (prop_id) { case PROP_XALIGN: g_value_set_float (value, aspect_frame->xalign); break; case PROP_YALIGN: g_value_set_float (value, aspect_frame->yalign); break; case PROP_RATIO: g_value_set_float (value, aspect_frame->ratio); break; case PROP_OBEY_CHILD: g_value_set_boolean (value, aspect_frame->obey_child); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } GtkWidget* gtk_aspect_frame_new (const gchar *label, gfloat xalign, gfloat yalign, gfloat ratio, gboolean obey_child) { GtkAspectFrame *aspect_frame; aspect_frame = g_object_new (GTK_TYPE_ASPECT_FRAME, NULL); aspect_frame->xalign = CLAMP (xalign, 0.0, 1.0); aspect_frame->yalign = CLAMP (yalign, 0.0, 1.0); aspect_frame->ratio = CLAMP (ratio, MIN_RATIO, MAX_RATIO); aspect_frame->obey_child = obey_child != FALSE; gtk_frame_set_label (GTK_FRAME(aspect_frame), label); return GTK_WIDGET (aspect_frame); } void gtk_aspect_frame_set (GtkAspectFrame *aspect_frame, gfloat xalign, gfloat yalign, gfloat ratio, gboolean obey_child) { g_return_if_fail (GTK_IS_ASPECT_FRAME (aspect_frame)); xalign = CLAMP (xalign, 0.0, 1.0); yalign = CLAMP (yalign, 0.0, 1.0); ratio = CLAMP (ratio, MIN_RATIO, MAX_RATIO); obey_child = obey_child != FALSE; if ( (aspect_frame->xalign != xalign) || (aspect_frame->yalign != yalign) || (aspect_frame->ratio != ratio) || (aspect_frame->obey_child != obey_child)) { g_object_freeze_notify (G_OBJECT (aspect_frame)); if (aspect_frame->xalign != xalign) { aspect_frame->xalign = xalign; g_object_notify (G_OBJECT (aspect_frame), "xalign"); } if (aspect_frame->yalign != yalign) { aspect_frame->yalign = yalign; g_object_notify (G_OBJECT (aspect_frame), "yalign"); } if (aspect_frame->ratio != ratio) { aspect_frame->ratio = ratio; g_object_notify (G_OBJECT (aspect_frame), "ratio"); } if (aspect_frame->obey_child != obey_child) { aspect_frame->obey_child = obey_child; g_object_notify (G_OBJECT (aspect_frame), "obey_child"); } g_object_thaw_notify (G_OBJECT (aspect_frame)); gtk_widget_queue_resize (GTK_WIDGET (aspect_frame)); } } static void gtk_aspect_frame_compute_child_allocation (GtkFrame *frame, GtkAllocation *child_allocation) { GtkAspectFrame *aspect_frame = GTK_ASPECT_FRAME (frame); GtkBin *bin = GTK_BIN (frame); gdouble ratio; if (bin->child && GTK_WIDGET_VISIBLE (bin->child)) { GtkAllocation full_allocation; if (aspect_frame->obey_child) { GtkRequisition child_requisition; gtk_widget_get_child_requisition (bin->child, &child_requisition); if (child_requisition.height != 0) { ratio = ((gdouble) child_requisition.width / child_requisition.height); if (ratio < MIN_RATIO) ratio = MIN_RATIO; } else if (child_requisition.width != 0) ratio = MAX_RATIO; else ratio = 1.0; } else ratio = aspect_frame->ratio; parent_class->compute_child_allocation (frame, &full_allocation); if (ratio * full_allocation.height > full_allocation.width) { child_allocation->width = full_allocation.width; child_allocation->height = full_allocation.width / ratio + 0.5; } else { child_allocation->width = ratio * full_allocation.height + 0.5; child_allocation->height = full_allocation.height; } child_allocation->x = full_allocation.x + aspect_frame->xalign * (full_allocation.width - child_allocation->width); child_allocation->y = full_allocation.y + aspect_frame->yalign * (full_allocation.height - child_allocation->height); } else parent_class->compute_child_allocation (frame, child_allocation); } #define __GTK_ASPECT_FRAME_C__ #include "gtkaliasdef.c"