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#include <stdlib.h>
#include <string.h>
#include "txt_widget.h"
typedef struct
{
char *signal_name;
TxtWidgetSignalFunc func;
void *user_data;
} txt_callback_t;
struct txt_callback_table_s
{
txt_callback_t *callbacks;
int num_callbacks;
};
txt_callback_table_t *TXT_NewCallbackTable(void)
{
txt_callback_table_t *table;
table = malloc(sizeof(txt_callback_table_t));
table->callbacks = NULL;
table->num_callbacks = 0;
return table;
}
void TXT_DestroyCallbackTable(txt_callback_table_t *table)
{
int i;
for (i=0; i<table->num_callbacks; ++i)
{
free(table->callbacks[i].signal_name);
}
free(table->callbacks);
free(table);
}
void TXT_InitWidget(TXT_UNCAST_ARG(widget), txt_widget_class_t *widget_class)
{
TXT_CAST_ARG(txt_widget_t, widget);
widget->widget_class = widget_class;
widget->callback_table = TXT_NewCallbackTable();
// Default values: visible and selectable
widget->selectable = 1;
widget->visible = 1;
}
void TXT_SignalConnect(TXT_UNCAST_ARG(widget),
char *signal_name,
TxtWidgetSignalFunc func,
void *user_data)
{
TXT_CAST_ARG(txt_widget_t, widget);
txt_callback_table_t *table;
txt_callback_t *callback;
int i;
table = widget->callback_table;
for (i=0; i<table->num_callbacks; ++i)
{
if (!strcmp(signal_name, table->callbacks[i].signal_name))
{
// Replace existing signal
table->callbacks[i].func = func;
table->callbacks[i].user_data = user_data;
break;
}
}
// Add a new callback to the table
table->callbacks
= realloc(table->callbacks,
sizeof(txt_callback_t) * (table->num_callbacks + 1));
callback = &table->callbacks[table->num_callbacks];
++table->num_callbacks;
callback->signal_name = strdup(signal_name);
callback->func = func;
callback->user_data = user_data;
}
void TXT_EmitSignal(TXT_UNCAST_ARG(widget), char *signal_name)
{
TXT_CAST_ARG(txt_widget_t, widget);
txt_callback_table_t *table;
int i;
table = widget->callback_table;
for (i=0; i<table->num_callbacks; ++i)
{
if (!strcmp(table->callbacks[i].signal_name, signal_name))
{
table->callbacks[i].func(widget, table->callbacks[i].user_data);
break;
}
}
}
void TXT_CalcWidgetSize(TXT_UNCAST_ARG(widget), int *w, int *h)
{
TXT_CAST_ARG(txt_widget_t, widget);
return widget->widget_class->size_calc(widget, w, h);
}
void TXT_DrawWidget(TXT_UNCAST_ARG(widget), int w, int selected)
{
TXT_CAST_ARG(txt_widget_t, widget);
widget->widget_class->drawer(widget, w, selected);
}
void TXT_DestroyWidget(TXT_UNCAST_ARG(widget))
{
TXT_CAST_ARG(txt_widget_t, widget);
widget->widget_class->destructor(widget);
TXT_DestroyCallbackTable(widget->callback_table);
free(widget);
}
int TXT_WidgetKeyPress(TXT_UNCAST_ARG(widget), int key)
{
TXT_CAST_ARG(txt_widget_t, widget);
if (widget->widget_class->key_press != NULL)
{
return widget->widget_class->key_press(widget, key);
}
return 0;
}
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