irreco/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  * @addtogroup IrrecoScrolledWindow
  24  * @ingroup Irreco
  25  *
  26  * A GtkScrolledWindow with automatic resising to fit client widgets.
  27  *
  28  * @{
  29  */
  30
  31 /**
  32  * @file
  33  * Source file of @ref IrrecoScrolledWindow.
  34  */
  35
  36
  37 /*=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-*/
  38 /* Prototypes                                                                 */
  39 /*=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-*/
  40 static void irreco_scrolled_window_size_request(GtkWidget *widget,
  41                                                 GtkRequisition *requisition,
  42                                                 IrrecoScrolledWindow *self);
  43
  44
  45
  46 /*=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-*/
  47 /* Construction & Destruction                                                 */
  48 /*=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-*/
  49
  50 /**
  51  * @name Construction & Destruction
  52  * @{
  53  */
  54
  55 G_DEFINE_TYPE(IrrecoScrolledWindow, irreco_scrolled_window, GTK_TYPE_SCROLLED_WINDOW)
  56
  57 static void irreco_scrolled_window_finalize(GObject *object)
  58 {
  59         G_OBJECT_CLASS(irreco_scrolled_window_parent_class)->finalize (object);
  60 }
  61
  62 static void irreco_scrolled_window_class_init(IrrecoScrolledWindowClass *klass)
  63 {
  64         GObjectClass *object_class = G_OBJECT_CLASS(klass);
  65         object_class->finalize = irreco_scrolled_window_finalize;
  66 }
  67
  68 static void irreco_scrolled_window_init(IrrecoScrolledWindow *self)
  69 {
  70         IRRECO_ENTER
  71
  72         /* Setup scrolled window. */
  73         gtk_scrolled_window_set_hadjustment(GTK_SCROLLED_WINDOW(self), NULL);
  74         gtk_scrolled_window_set_vadjustment(GTK_SCROLLED_WINDOW(self), NULL);
  75         gtk_scrolled_window_set_policy(GTK_SCROLLED_WINDOW(self),
  76                                        GTK_POLICY_AUTOMATIC,
  77                                        GTK_POLICY_AUTOMATIC);
  78
  79         /* Create container for child. We use this container to make sure that
  80            possible extra space inside the scrolled_window is not allocated to
  81            the child widget. */
  82         self->alignment = gtk_alignment_new(0, 0, 0, 0);
  83         gtk_alignment_set_padding(GTK_ALIGNMENT(self->alignment), 0, 0, 0, 0);
  84         gtk_scrolled_window_add_with_viewport(GTK_SCROLLED_WINDOW(self),
  85                                               self->alignment);
  86
  87         /* Connect signals. */
  88         g_signal_connect(G_OBJECT(self), "size-request",
  89                          G_CALLBACK(irreco_scrolled_window_size_request),
  90                          self);
  91
  92         IRRECO_RETURN
  93 }
  94
  95 GtkWidget* irreco_scrolled_window_new(void)
  96 {
  97         IRRECO_ENTER
  98         IRRECO_RETURN_PTR(g_object_new(IRRECO_TYPE_SCROLLED_WINDOW, NULL));
  99 }
 100
 101 GtkWidget* irreco_scrolled_window_new_with_autoresize(gint width_min,
 102                                                       gint width_max,
 103                                                       gint height_min,
 104                                                       gint height_max)
 105 {
 106         IrrecoScrolledWindow *self;
 107         IRRECO_ENTER
 108
 109         self = g_object_new(IRRECO_TYPE_SCROLLED_WINDOW, NULL);
 110         irreco_scrolled_window_set_autoresize(self, width_min, width_max,
 111                                               height_min, height_max);
 112         IRRECO_RETURN_PTR(self);
 113 }
 114
 115 /** @} */
 116
 117
 118
 119 /*=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-*/
 120 /* Functions                                                                  */
 121 /*=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-*/
 122
 123 /**
 124  * @name Public Functions
 125  * @{
 126  */
 127
 128 void irreco_scrolled_window_set_autoresize(IrrecoScrolledWindow *self,
 129                                            gint width_min,
 130                                            gint width_max,
 131                                            gint height_min,
 132                                            gint height_max)
 133 {
 134         IRRECO_ENTER
 135         if ((self->width_min  = width_min)  < 0) self->width_min  = 0;
 136         if ((self->width_max  = width_max)  < 0) self->width_max  = 0;
 137         if ((self->height_min = height_min) < 0) self->height_min = 0;
 138         if ((self->height_max = height_max) < 0) self->height_max = 0;
 139         IRRECO_RETURN
 140 }
 141
 142 void irreco_scrolled_window_add(IrrecoScrolledWindow *self,
 143                                 GtkWidget *widget)
 144 {
 145         IRRECO_ENTER
 146         self->child = widget;
 147         gtk_container_add(GTK_CONTAINER(self->alignment), widget);
 148         IRRECO_RETURN
 149 }
 150
 151 /** @} */
 152
 153
 154
 155 /*=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-*/
 156 /* Events and Callbacks                                                       */
 157 /*=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-*/
 158
 159 /**
 160  * @name Events and Callbacks
 161  * @{
 162  */
 163
 164 static void irreco_scrolled_window_size_request(GtkWidget *widget,
 165                                                 GtkRequisition *requisition,
 166                                                 IrrecoScrolledWindow *self)
 167 {
 168         GtkRequisition child_req;
 169         gint scrollbar_space = 30;
 170         /*GtkAdjustment *adj;*/
 171         IRRECO_ENTER
 172
 173         if (self->child == NULL) IRRECO_RETURN;
 174
 175         gtk_widget_size_request(self->child, &child_req);
 176         IRRECO_DEBUG("Child size requisition: w%i h%i\n",
 177                      child_req.width,
 178                      child_req.height);
 179
 180         /* Height */
 181         if (self->height_min > child_req.height) {
 182                 requisition->height = self->height_min;
 183         } else {
 184                 requisition->height = child_req.height;
 185         }
 186         if (self->height_max > 0
 187             && requisition->height > self->height_max) {
 188                 requisition->height = self->height_max;
 189         }
 190
 191         /* Width */
 192         if (self->width_min > child_req.width) {
 193                 requisition->width = self->width_min + scrollbar_space;
 194         } else {
 195                 requisition->width = child_req.width + scrollbar_space;
 196         }
 197         if (self->width_max > 0
 198             && requisition->width > self->width_max) {
 199                 requisition->width = self->width_max;
 200         }
 201
 202         IRRECO_DEBUG("Size requisition: w%i h%i\n",
 203                      requisition->width,
 204                      requisition->height);
 205
 206         IRRECO_RETURN
 207 }
 208
 209 /** @} */
 210 /** @} */
 211
 212
 213