irreco/trunk/src/core/irreco_scrolled_window.c

   1 /*
   2  * irreco - Ir Remote Control
   3  * Copyright (C) 2007  Arto Karppinen (arto.karppinen@iki.fi)
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License
   7  * as published by the Free Software Foundation; either version 2
   8  * of the License, or (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  18  */
  19
  20 #include "irreco_scrolled_window.h"
  21
  22 /**
  23  * @typedef IrrecoScrolledWindow
  24  *
  25  * A GtkScrolledWindow with automatic resising to fit client widgets.
  26  */
  27
  28 /*=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-*/
  29 /* Prototypes                                                                 */
  30 /*=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-*/
  31 static void irreco_scrolled_window_size_request(GtkWidget *widget,
  32                                                 GtkRequisition *requisition,
  33                                                 IrrecoScrolledWindow *self);
  34
  35
  36
  37 /*=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-*/
  38 /* Construction & Destruction                                                 */
  39 /*=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-*/
  40
  41 G_DEFINE_TYPE(IrrecoScrolledWindow, irreco_scrolled_window, GTK_TYPE_SCROLLED_WINDOW)
  42
  43 static void irreco_scrolled_window_finalize(GObject *object)
  44 {
  45         G_OBJECT_CLASS(irreco_scrolled_window_parent_class)->finalize (object);
  46 }
  47
  48 static void irreco_scrolled_window_class_init(IrrecoScrolledWindowClass *klass)
  49 {
  50         GObjectClass *object_class = G_OBJECT_CLASS(klass);
  51         object_class->finalize = irreco_scrolled_window_finalize;
  52 }
  53
  54 static void irreco_scrolled_window_init(IrrecoScrolledWindow *self)
  55 {
  56         IRRECO_ENTER
  57
  58         /* Setup scrolled window. */
  59         gtk_scrolled_window_set_hadjustment(GTK_SCROLLED_WINDOW(self), NULL);
  60         gtk_scrolled_window_set_vadjustment(GTK_SCROLLED_WINDOW(self), NULL);
  61         gtk_scrolled_window_set_policy(GTK_SCROLLED_WINDOW(self),
  62                                        GTK_POLICY_AUTOMATIC,
  63                                        GTK_POLICY_AUTOMATIC);
  64
  65         /* Create container for child. We use this container to make sure that
  66            possible extra space inside the scrolled_window is not allocated to
  67            the child widget. */
  68         self->alignment = gtk_alignment_new(0, 0, 0, 0);
  69         gtk_alignment_set_padding(GTK_ALIGNMENT(self->alignment), 0, 0, 0, 0);
  70         gtk_scrolled_window_add_with_viewport(GTK_SCROLLED_WINDOW(self),
  71                                               self->alignment);
  72
  73         /* Connect signals. */
  74         g_signal_connect(G_OBJECT(self), "size-request",
  75                          G_CALLBACK(irreco_scrolled_window_size_request),
  76                          self);
  77
  78         IRRECO_RETURN
  79 }
  80
  81 GtkWidget* irreco_scrolled_window_new(void)
  82 {
  83         IRRECO_ENTER
  84         IRRECO_RETURN_PTR(g_object_new(IRRECO_TYPE_SCROLLED_WINDOW, NULL));
  85 }
  86
  87 GtkWidget* irreco_scrolled_window_new_with_autoresize(gint width_min,
  88                                                       gint width_max,
  89                                                       gint height_min,
  90                                                       gint height_max)
  91 {
  92         IrrecoScrolledWindow *self;
  93         IRRECO_ENTER
  94
  95         self = g_object_new(IRRECO_TYPE_SCROLLED_WINDOW, NULL);
  96         irreco_scrolled_window_set_autoresize(self, width_min, width_max,
  97                                               height_min, height_max);
  98         IRRECO_RETURN_PTR(self);
  99 }
 100
 101
 102
 103 /*=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-*/
 104 /* Functions                                                                  */
 105 /*=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-*/
 106
 107 void irreco_scrolled_window_set_autoresize(IrrecoScrolledWindow *self,
 108                                            gint width_min,
 109                                            gint width_max,
 110                                            gint height_min,
 111                                            gint height_max)
 112 {
 113         IRRECO_ENTER
 114         if ((self->width_min  = width_min)  < 0) self->width_min  = 0;
 115         if ((self->width_max  = width_max)  < 0) self->width_max  = 0;
 116         if ((self->height_min = height_min) < 0) self->height_min = 0;
 117         if ((self->height_max = height_max) < 0) self->height_max = 0;
 118         IRRECO_RETURN
 119 }
 120
 121 void irreco_scrolled_window_add(IrrecoScrolledWindow *self,
 122                                 GtkWidget *widget)
 123 {
 124         IRRECO_ENTER
 125         self->child = widget;
 126         gtk_container_add(GTK_CONTAINER(self->alignment), widget);
 127         IRRECO_RETURN
 128 }
 129
 130
 131
 132 /*=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-*/
 133 /* Events and Callbacks                                                       */
 134 /*=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-*/
 135
 136 static void irreco_scrolled_window_size_request(GtkWidget *widget,
 137                                                 GtkRequisition *requisition,
 138                                                 IrrecoScrolledWindow *self)
 139 {
 140         GtkRequisition child_req;
 141         gint scrollbar_space = 30;
 142         /*GtkAdjustment *adj;*/
 143         IRRECO_ENTER
 144
 145         if (self->child == NULL) IRRECO_RETURN;
 146
 147         gtk_widget_size_request(self->child, &child_req);
 148         IRRECO_DEBUG("Child size requisition: w%i h%i\n",
 149                      child_req.width,
 150                      child_req.height);
 151
 152         /* Height */
 153         if (self->height_min > child_req.height) {
 154                 requisition->height = self->height_min;
 155         } else {
 156                 requisition->height = child_req.height;
 157         }
 158         if (self->height_max > 0
 159             && requisition->height > self->height_max) {
 160                 requisition->height = self->height_max;
 161         }
 162
 163         /* Width */
 164         if (self->width_min > child_req.width) {
 165                 requisition->width = self->width_min + scrollbar_space;
 166         } else {
 167                 requisition->width = child_req.width + scrollbar_space;
 168         }
 169         if (self->width_max > 0
 170             && requisition->width > self->width_max) {
 171                 requisition->width = self->width_max;
 172         }
 173
 174         IRRECO_DEBUG("Size requisition: w%i h%i\n",
 175                      requisition->width,
 176                      requisition->height);
 177
 178         IRRECO_RETURN
 179 }
 180
 181
 182
 183
 184