ref: f8a450f494e1ab5b6dbe915331e13abe03c298b3
dir: /textscreen/txt_widget.c/
//
// Copyright(C) 2005-2014 Simon Howard
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// This program 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 General Public License for more details.
//
#include <stdlib.h>
#include <string.h>
#include "txt_io.h"
#include "txt_widget.h"
#include "txt_gui.h"
#include "txt_desktop.h"
typedef struct
{
char *signal_name;
TxtWidgetSignalFunc func;
void *user_data;
} txt_callback_t;
struct txt_callback_table_s
{
int refcount;
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;
table->refcount = 1;
return table;
}
void TXT_RefCallbackTable(txt_callback_table_t *table)
{
++table->refcount;
}
void TXT_UnrefCallbackTable(txt_callback_table_t *table)
{
int i;
--table->refcount;
if (table->refcount == 0)
{
// No more references to this table
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();
widget->parent = NULL;
// Not focused until we hear otherwise.
widget->focused = 0;
// Visible by default.
widget->visible = 1;
// Align left by default
widget->align = TXT_HORIZ_LEFT;
}
void TXT_SignalConnect(TXT_UNCAST_ARG(widget),
const char *signal_name,
TxtWidgetSignalFunc func,
void *user_data)
{
TXT_CAST_ARG(txt_widget_t, widget);
txt_callback_table_t *table;
txt_callback_t *callback;
table = widget->callback_table;
// 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), const char *signal_name)
{
TXT_CAST_ARG(txt_widget_t, widget);
txt_callback_table_t *table;
int i;
table = widget->callback_table;
// Don't destroy the table while we're searching through it
// (one of the callbacks may destroy this window)
TXT_RefCallbackTable(table);
// Search the table for all callbacks with this name and invoke
// the functions.
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);
}
}
// Finished using the table
TXT_UnrefCallbackTable(table);
}
void TXT_CalcWidgetSize(TXT_UNCAST_ARG(widget))
{
TXT_CAST_ARG(txt_widget_t, widget);
widget->widget_class->size_calc(widget);
}
void TXT_DrawWidget(TXT_UNCAST_ARG(widget))
{
TXT_CAST_ARG(txt_widget_t, widget);
txt_saved_colors_t colors;
// The drawing function might change the fg/bg colors,
// so make sure we restore them after it's done.
TXT_SaveColors(&colors);
// For convenience...
TXT_GotoXY(widget->x, widget->y);
// Call drawer method
widget->widget_class->drawer(widget);
TXT_RestoreColors(&colors);
}
void TXT_DestroyWidget(TXT_UNCAST_ARG(widget))
{
TXT_CAST_ARG(txt_widget_t, widget);
widget->widget_class->destructor(widget);
TXT_UnrefCallbackTable(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;
}
void TXT_SetWidgetFocus(TXT_UNCAST_ARG(widget), int focused)
{
TXT_CAST_ARG(txt_widget_t, widget);
if (widget == NULL)
{
return;
}
if (widget->focused != focused)
{
widget->focused = focused;
if (widget->widget_class->focus_change != NULL)
{
widget->widget_class->focus_change(widget, focused);
}
}
}
void TXT_SetWidgetAlign(TXT_UNCAST_ARG(widget), txt_horiz_align_t horiz_align)
{
TXT_CAST_ARG(txt_widget_t, widget);
widget->align = horiz_align;
}
void TXT_WidgetMousePress(TXT_UNCAST_ARG(widget), int x, int y, int b)
{
TXT_CAST_ARG(txt_widget_t, widget);
if (widget->widget_class->mouse_press != NULL)
{
widget->widget_class->mouse_press(widget, x, y, b);
}
}
void TXT_LayoutWidget(TXT_UNCAST_ARG(widget))
{
TXT_CAST_ARG(txt_widget_t, widget);
if (widget->widget_class->layout != NULL)
{
widget->widget_class->layout(widget);
}
}
int TXT_AlwaysSelectable(TXT_UNCAST_ARG(widget))
{
return 1;
}
int TXT_NeverSelectable(TXT_UNCAST_ARG(widget))
{
return 0;
}
int TXT_SelectableWidget(TXT_UNCAST_ARG(widget))
{
TXT_CAST_ARG(txt_widget_t, widget);
if (widget->widget_class->selectable != NULL)
{
return widget->widget_class->selectable(widget);
}
else
{
return 0;
}
}
int TXT_ContainsWidget(TXT_UNCAST_ARG(haystack), TXT_UNCAST_ARG(needle))
{
TXT_CAST_ARG(txt_widget_t, haystack);
TXT_CAST_ARG(txt_widget_t, needle);
while (needle != NULL)
{
if (needle == haystack)
{
return 1;
}
needle = needle->parent;
}
return 0;
}
int TXT_HoveringOverWidget(TXT_UNCAST_ARG(widget))
{
TXT_CAST_ARG(txt_widget_t, widget);
txt_window_t *active_window;
int x, y;
// We can only be hovering over widgets in the active window.
active_window = TXT_GetActiveWindow();
if (active_window == NULL || !TXT_ContainsWidget(active_window, widget))
{
return 0;
}
// Is the mouse cursor within the bounds of the widget?
TXT_GetMousePosition(&x, &y);
return (x >= widget->x && x < widget->x + widget->w
&& y >= widget->y && y < widget->y + widget->h);
}
void TXT_SetWidgetBG(TXT_UNCAST_ARG(widget))
{
TXT_CAST_ARG(txt_widget_t, widget);
if (widget->focused)
{
TXT_BGColor(TXT_COLOR_GREY, 0);
}
else if (TXT_HoveringOverWidget(widget))
{
TXT_BGColor(TXT_HOVER_BACKGROUND, 0);
}
else
{
// Use normal window background.
}
}