ref: 3d6f4785591eced3e4195a342980facd0adcb284
dir: /textscreen/txt_inputbox.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 <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "doomkeys.h"
#include "txt_inputbox.h"
#include "txt_gui.h"
#include "txt_io.h"
#include "txt_main.h"
#include "txt_utf8.h"
#include "txt_window.h"
extern txt_widget_class_t txt_inputbox_class;
extern txt_widget_class_t txt_int_inputbox_class;
static void SetBufferFromValue(txt_inputbox_t *inputbox)
{
if (inputbox->widget.widget_class == &txt_inputbox_class)
{
char **value = (char **) inputbox->value;
if (*value != NULL)
{
TXT_StringCopy(inputbox->buffer, *value, inputbox->size);
}
else
{
TXT_StringCopy(inputbox->buffer, "", inputbox->buffer_len);
}
}
else if (inputbox->widget.widget_class == &txt_int_inputbox_class)
{
int *value = (int *) inputbox->value;
TXT_snprintf(inputbox->buffer, inputbox->buffer_len, "%i", *value);
}
}
static void StartEditing(txt_inputbox_t *inputbox)
{
// Integer input boxes start from an empty buffer:
if (inputbox->widget.widget_class == &txt_int_inputbox_class)
{
TXT_StringCopy(inputbox->buffer, "", inputbox->buffer_len);
}
else
{
SetBufferFromValue(inputbox);
}
inputbox->editing = 1;
}
static void FinishEditing(txt_inputbox_t *inputbox)
{
if (!inputbox->editing)
{
return;
}
// Save the new value back to the variable.
if (inputbox->widget.widget_class == &txt_inputbox_class)
{
free(*((char **)inputbox->value));
*((char **) inputbox->value) = strdup(inputbox->buffer);
}
else if (inputbox->widget.widget_class == &txt_int_inputbox_class)
{
*((int *) inputbox->value) = atoi(inputbox->buffer);
}
TXT_EmitSignal(&inputbox->widget, "changed");
inputbox->editing = 0;
}
static void TXT_InputBoxSizeCalc(TXT_UNCAST_ARG(inputbox))
{
TXT_CAST_ARG(txt_inputbox_t, inputbox);
// Enough space for the box + cursor
inputbox->widget.w = inputbox->size + 1;
inputbox->widget.h = 1;
}
static void TXT_InputBoxDrawer(TXT_UNCAST_ARG(inputbox))
{
TXT_CAST_ARG(txt_inputbox_t, inputbox);
int focused;
int i;
int chars;
int w;
focused = inputbox->widget.focused;
w = inputbox->widget.w;
// Select the background color based on whether we are currently
// editing, and if not, whether the widget is focused.
if (inputbox->editing && focused)
{
TXT_BGColor(TXT_COLOR_BLACK, 0);
}
else
{
TXT_SetWidgetBG(inputbox);
}
if (!inputbox->editing)
{
// If not editing, use the current value from inputbox->value.
SetBufferFromValue(inputbox);
}
// If string size exceeds the widget's width, show only the end.
if (TXT_UTF8_Strlen(inputbox->buffer) > w - 1)
{
TXT_DrawString("\xae");
TXT_DrawUTF8String(
TXT_UTF8_SkipChars(inputbox->buffer,
TXT_UTF8_Strlen(inputbox->buffer) - w + 2));
chars = w - 1;
}
else
{
TXT_DrawUTF8String(inputbox->buffer);
chars = TXT_UTF8_Strlen(inputbox->buffer);
}
if (chars < w && inputbox->editing && focused)
{
TXT_BGColor(TXT_COLOR_BLACK, 1);
TXT_DrawString("_");
++chars;
}
for (i=chars; i < w; ++i)
{
TXT_DrawString(" ");
}
}
static void TXT_InputBoxDestructor(TXT_UNCAST_ARG(inputbox))
{
TXT_CAST_ARG(txt_inputbox_t, inputbox);
free(inputbox->buffer);
}
static void Backspace(txt_inputbox_t *inputbox)
{
unsigned int len;
char *p;
len = TXT_UTF8_Strlen(inputbox->buffer);
if (len > 0)
{
p = TXT_UTF8_SkipChars(inputbox->buffer, len - 1);
*p = '\0';
}
}
static void AddCharacter(txt_inputbox_t *inputbox, int key)
{
char *end, *p;
if (TXT_UTF8_Strlen(inputbox->buffer) < inputbox->size)
{
// Add character to the buffer
end = inputbox->buffer + strlen(inputbox->buffer);
p = TXT_EncodeUTF8(end, key);
*p = '\0';
}
}
static int TXT_InputBoxKeyPress(TXT_UNCAST_ARG(inputbox), int key)
{
TXT_CAST_ARG(txt_inputbox_t, inputbox);
unsigned int c;
if (!inputbox->editing)
{
if (key == KEY_ENTER)
{
StartEditing(inputbox);
return 1;
}
// Backspace or delete erases the contents of the box.
if ((key == KEY_DEL || key == KEY_BACKSPACE)
&& inputbox->widget.widget_class == &txt_inputbox_class)
{
free(*((char **)inputbox->value));
*((char **) inputbox->value) = strdup("");
}
return 0;
}
if (key == KEY_ENTER)
{
FinishEditing(inputbox);
}
if (key == KEY_ESCAPE)
{
inputbox->editing = 0;
}
if (key == KEY_BACKSPACE)
{
Backspace(inputbox);
}
c = TXT_KEY_TO_UNICODE(key);
// Add character to the buffer, but only if it's a printable character
// that we can represent on the screen.
if (isprint(c)
|| (c >= 128 && TXT_CanDrawCharacter(c)))
{
AddCharacter(inputbox, c);
}
return 1;
}
static void TXT_InputBoxMousePress(TXT_UNCAST_ARG(inputbox),
int x, int y, int b)
{
TXT_CAST_ARG(txt_inputbox_t, inputbox);
if (b == TXT_MOUSE_LEFT)
{
// Make mouse clicks start editing the box
if (!inputbox->editing)
{
// Send a simulated keypress to start editing
TXT_WidgetKeyPress(inputbox, KEY_ENTER);
}
}
}
static void TXT_InputBoxFocused(TXT_UNCAST_ARG(inputbox), int focused)
{
TXT_CAST_ARG(txt_inputbox_t, inputbox);
// Stop editing when we lose focus.
if (inputbox->editing && !focused)
{
FinishEditing(inputbox);
}
}
txt_widget_class_t txt_inputbox_class =
{
TXT_AlwaysSelectable,
TXT_InputBoxSizeCalc,
TXT_InputBoxDrawer,
TXT_InputBoxKeyPress,
TXT_InputBoxDestructor,
TXT_InputBoxMousePress,
NULL,
TXT_InputBoxFocused,
};
txt_widget_class_t txt_int_inputbox_class =
{
TXT_AlwaysSelectable,
TXT_InputBoxSizeCalc,
TXT_InputBoxDrawer,
TXT_InputBoxKeyPress,
TXT_InputBoxDestructor,
TXT_InputBoxMousePress,
NULL,
TXT_InputBoxFocused,
};
static txt_inputbox_t *NewInputBox(txt_widget_class_t *widget_class,
void *value, int size)
{
txt_inputbox_t *inputbox;
inputbox = malloc(sizeof(txt_inputbox_t));
TXT_InitWidget(inputbox, widget_class);
inputbox->value = value;
inputbox->size = size;
// 'size' is the maximum number of characters that can be entered,
// but for a UTF-8 string, each character can take up to four
// characters.
inputbox->buffer_len = size * 4 + 1;
inputbox->buffer = malloc(inputbox->buffer_len);
inputbox->editing = 0;
return inputbox;
}
txt_inputbox_t *TXT_NewInputBox(char **value, int size)
{
return NewInputBox(&txt_inputbox_class, value, size);
}
txt_inputbox_t *TXT_NewIntInputBox(int *value, int size)
{
return NewInputBox(&txt_int_inputbox_class, value, size);
}