src/lib/elm_button.c

   1 #include <Elementary.h>
   2 #include "elm_priv.h"
   3
   4 /**
   5  * @defgroup Button Button
   6  *
   7  * This is a push-button. Press it and run some function. It can contain
   8  * a simple label and icon object.
   9  */
  10
  11 typedef struct _Widget_Data Widget_Data;
  12
  13 struct _Widget_Data
  14 {
  15    Evas_Object *btn, *icon;
  16    const char *label;
  17 };
  18
  19 static void _del_hook(Evas_Object *obj);
  20 static void _theme_hook(Evas_Object *obj);
  21 static void _disable_hook(Evas_Object *obj);
  22 static void _sizing_eval(Evas_Object *obj);
  23 static void _changed_size_hints(void *data, Evas *e, Evas_Object *obj, void *event_info);
  24 static void _sub_del(void *data, Evas_Object *obj, void *event_info);
  25 static void _signal_clicked(void *data, Evas_Object *obj, const char *emission, const char *source);
  26 static void _on_focus_hook(void *data, Evas_Object *obj);
  27
  28 static void
  29 _del_hook(Evas_Object *obj)
  30 {
  31    Widget_Data *wd = elm_widget_data_get(obj);
  32    if (!wd) return;
  33    if (wd->label) eina_stringshare_del(wd->label);
  34    free(wd);
  35 }
  36
  37 static void
  38 _on_focus_hook(void *data, Evas_Object *obj)
  39 {
  40    Widget_Data *wd = elm_widget_data_get(obj);
  41    Evas_Object *top = elm_widget_top_get(obj);
  42
  43    if (elm_widget_focus_get(obj))
  44      edje_object_signal_emit(wd->btn, "elm,action,focus", "elm");
  45    else
  46      edje_object_signal_emit(wd->btn, "elm,action,unfocus", "elm");
  47 }
  48
  49 static void
  50 _theme_hook(Evas_Object *obj)
  51 {
  52    Widget_Data *wd = elm_widget_data_get(obj);
  53    if (!wd) return;
  54    _elm_theme_set(wd->btn, "button", "base", elm_widget_style_get(obj));
  55    if (wd->icon)
  56      edje_object_part_swallow(wd->btn, "elm.swallow.content", wd->icon);
  57    if (wd->label)
  58      edje_object_signal_emit(wd->btn, "elm,state,text,visible", "elm");
  59    else
  60      edje_object_signal_emit(wd->btn, "elm,state,text,hidden", "elm");
  61    if (wd->icon)
  62      edje_object_signal_emit(wd->btn, "elm,state,icon,visible", "elm");
  63    else
  64      edje_object_signal_emit(wd->btn, "elm,state,icon,hidden", "elm");
  65    edje_object_part_text_set(wd->btn, "elm.text", wd->label);
  66    edje_object_message_signal_process(wd->btn);
  67    edje_object_scale_set(wd->btn, elm_widget_scale_get(obj) * _elm_config->scale);
  68    _sizing_eval(obj);
  69 }
  70
  71 static void
  72 _disable_hook(Evas_Object *obj)
  73 {
  74    Widget_Data *wd = elm_widget_data_get(obj);
  75    if (elm_widget_disabled_get(obj))
  76      edje_object_signal_emit(wd->btn, "elm,state,disabled", "elm");
  77    else
  78      edje_object_signal_emit(wd->btn, "elm,state,enabled", "elm");
  79 }
  80
  81 static void
  82 _sizing_eval(Evas_Object *obj)
  83 {
  84    Widget_Data *wd = elm_widget_data_get(obj);
  85    Evas_Coord minw = -1, minh = -1, maxw = -1, maxh = -1;
  86
  87    if (!wd) return;
  88    elm_coords_finger_size_adjust(1, &minw, 1, &minh);
  89    edje_object_size_min_restricted_calc(wd->btn, &minw, &minh, minw, minh);
  90    elm_coords_finger_size_adjust(1, &minw, 1, &minh);
  91    evas_object_size_hint_min_set(obj, minw, minh);
  92    evas_object_size_hint_max_set(obj, maxw, maxh);
  93 }
  94
  95 static void
  96 _changed_size_hints(void *data, Evas *e, Evas_Object *obj, void *event_info)
  97 {
  98    Widget_Data *wd = elm_widget_data_get(data);
  99    if (!wd) return;
 100    if (obj != wd->icon) return;
 101    _sizing_eval(data);
 102 }
 103
 104 static void
 105 _sub_del(void *data, Evas_Object *obj, void *event_info)
 106 {
 107    Widget_Data *wd = elm_widget_data_get(obj);
 108    Evas_Object *sub = event_info;
 109    if (!wd) return;
 110    if (sub == wd->icon)
 111      {
 112         edje_object_signal_emit(wd->btn, "elm,state,icon,hidden", "elm");
 113         evas_object_event_callback_del_full(sub, EVAS_CALLBACK_CHANGED_SIZE_HINTS,
 114                                        _changed_size_hints, obj);
 115         wd->icon = NULL;
 116         edje_object_message_signal_process(wd->btn);
 117         _sizing_eval(obj);
 118      }
 119 }
 120
 121 static void
 122 _signal_clicked(void *data, Evas_Object *obj, const char *emission, const char *source)
 123 {
 124    Widget_Data *wd = elm_widget_data_get(data);
 125    if (!wd) return;
 126    evas_object_smart_callback_call(data, "clicked", NULL);
 127 }
 128
 129 /**
 130  * Add a new button to the parent
 131  * @param parent The parent object
 132  * @return The new object or NULL if it cannot be created
 133  *
 134  * @ingroup Button
 135  */
 136 EAPI Evas_Object *
 137 elm_button_add(Evas_Object *parent)
 138 {
 139    Evas_Object *obj;
 140    Evas *e;
 141    Widget_Data *wd;
 142
 143    wd = ELM_NEW(Widget_Data);
 144    e = evas_object_evas_get(parent);
 145    obj = elm_widget_add(e);
 146    elm_widget_type_set(obj, "button");
 147    elm_widget_sub_object_add(parent, obj);
 148    elm_widget_on_focus_hook_set( obj, _on_focus_hook, NULL );
 149    elm_widget_data_set(obj, wd);
 150    elm_widget_del_hook_set(obj, _del_hook);
 151    elm_widget_theme_hook_set(obj, _theme_hook);
 152    elm_widget_disable_hook_set(obj, _disable_hook);
 153    elm_widget_can_focus_set(obj, 1 );
 154
 155    wd->btn = edje_object_add(e);
 156    _elm_theme_set(wd->btn, "button", "base", "default");
 157    edje_object_signal_callback_add(wd->btn, "elm,action,click", "",
 158                                    _signal_clicked, obj);
 159    elm_widget_resize_object_set(obj, wd->btn);
 160
 161    evas_object_smart_callback_add(obj, "sub-object-del", _sub_del, obj);
 162
 163    _sizing_eval(obj);
 164    return obj;
 165 }
 166
 167 /**
 168  * Set the label used in the button
 169  *
 170  * @param obj The button object
 171  * @param label The text will be written on the button
 172  *
 173  * @ingroup Button
 174  */
 175 EAPI void
 176 elm_button_label_set(Evas_Object *obj, const char *label)
 177 {
 178    Widget_Data *wd = elm_widget_data_get(obj);
 179    Evas_Coord mw, mh;
 180
 181    if (!wd) return;
 182    if (wd->label) eina_stringshare_del(wd->label);
 183    if (label)
 184      {
 185         wd->label = eina_stringshare_add(label);
 186         edje_object_signal_emit(wd->btn, "elm,state,text,visible", "elm");
 187      }
 188    else
 189      {
 190         wd->label = NULL;
 191         edje_object_signal_emit(wd->btn, "elm,state,text,hidden", "elm");
 192      }
 193    edje_object_message_signal_process(wd->btn);
 194    edje_object_part_text_set(wd->btn, "elm.text", label);
 195    _sizing_eval(obj);
 196 }
 197
 198 EAPI const char*
 199 elm_button_label_get(Evas_Object *obj)
 200 {
 201    Widget_Data *wd = elm_widget_data_get(obj);
 202    if (!wd) return NULL;
 203    return wd->label;
 204 }
 205
 206 /**
 207  * Set the icon used for the button
 208  *
 209  * @param obj The button object
 210  * @param icon  The image for the button
 211  *
 212  * @ingroup Button
 213  */
 214 EAPI void
 215 elm_button_icon_set(Evas_Object *obj, Evas_Object *icon)
 216 {
 217    Widget_Data *wd = elm_widget_data_get(obj);
 218    if (!wd) return;
 219    if ((wd->icon != icon) && (wd->icon))
 220      elm_widget_sub_object_del(obj, wd->icon);
 221    if ((icon) && (wd->icon != icon))
 222      {
 223         wd->icon = icon;
 224         elm_widget_sub_object_add(obj, icon);
 225         evas_object_event_callback_add(icon, EVAS_CALLBACK_CHANGED_SIZE_HINTS,
 226                                        _changed_size_hints, obj);
 227         edje_object_part_swallow(wd->btn, "elm.swallow.content", icon);
 228         edje_object_signal_emit(wd->btn, "elm,state,icon,visible", "elm");
 229         edje_object_message_signal_process(wd->btn);
 230         _sizing_eval(obj);
 231      }
 232    else
 233      wd->icon = icon;
 234 }
 235
 236 EAPI Evas_Object *
 237 elm_button_icon_get(Evas_Object *obj)
 238 {
 239    Widget_Data *wd = elm_widget_data_get(obj);
 240    if (!wd) return NULL;
 241    return wd->icon;
 242 }
 243
 244 /**
 245  * Set the button style
 246  *
 247  * @param obj The button object
 248  * @param style The style for the button
 249  *
 250  * DEPRECATED. use elm_object_style_set() instead
 251  *
 252  * @ingroup Button
 253  */
 254 EAPI void
 255 elm_button_style_set(Evas_Object *obj, const char *style)
 256 {
 257    elm_widget_style_set(obj, style);
 258 }