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-rw-r--r--twin_demos/twin_calc.c239
1 files changed, 239 insertions, 0 deletions
diff --git a/twin_demos/twin_calc.c b/twin_demos/twin_calc.c
new file mode 100644
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--- /dev/null
+++ b/twin_demos/twin_calc.c
@@ -0,0 +1,239 @@
+/*
+ * Twin - A Tiny Window System
+ * Copyright © 2004 Keith Packard <keithp@keithp.com>
+ * All rights reserved.
+ *
+ * This Library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This Library 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
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with the Gnome Library; see the file COPYING.LIB. If not,
+ * write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#include "twin_calc.h"
+#include <stdio.h>
+
+#define TWIN_CALC_STACK 5
+#define TWIN_CALC_ZERO 0
+#define TWIN_CALC_ONE 1
+#define TWIN_CALC_TWO 2
+#define TWIN_CALC_THREE 3
+#define TWIN_CALC_FOUR 4
+#define TWIN_CALC_FIVE 5
+#define TWIN_CALC_SIX 6
+#define TWIN_CALC_SEVEN 7
+#define TWIN_CALC_EIGHT 8
+#define TWIN_CALC_NINE 9
+#define TWIN_CALC_PLUS 10
+#define TWIN_CALC_MINUS 11
+#define TWIN_CALC_TIMES 12
+#define TWIN_CALC_DIVIDE 13
+#define TWIN_CALC_EQUAL 14
+#define TWIN_CALC_CLEAR 15
+#define TWIN_CALC_NBUTTON 16
+
+/*
+ * Layout:
+ *
+ * display
+ *
+ * 7 8 9 +
+ * 4 5 6 -
+ * 1 2 3 *
+ * 0 clr = ÷
+ */
+#define TWIN_CALC_COLS 4
+#define TWIN_CALC_ROWS 4
+
+const static int calc_layout[TWIN_CALC_ROWS][TWIN_CALC_COLS] = {
+ { TWIN_CALC_SEVEN, TWIN_CALC_EIGHT, TWIN_CALC_NINE, TWIN_CALC_PLUS },
+ { TWIN_CALC_FOUR, TWIN_CALC_FIVE, TWIN_CALC_SIX, TWIN_CALC_MINUS },
+ { TWIN_CALC_ONE, TWIN_CALC_TWO, TWIN_CALC_THREE, TWIN_CALC_TIMES },
+ { TWIN_CALC_ZERO, TWIN_CALC_CLEAR, TWIN_CALC_EQUAL, TWIN_CALC_DIVIDE },
+};
+
+typedef struct _twin_calc {
+ int stack[TWIN_CALC_STACK];
+ int pending_op;
+ twin_bool_t pending_delete;
+ twin_window_t *window;
+ twin_toplevel_t *toplevel;
+ twin_box_t *keys;
+ twin_box_t *cols[4];
+ twin_label_t *display;
+ twin_button_t *buttons[TWIN_CALC_NBUTTON];
+} twin_calc_t;
+
+static const char *twin_calc_labels[] = {
+ "0", "1", "2", "3", "4", "5", "6", "7", "8", "9",
+ "+", "-", "*", "/", "=", "CLR"
+};
+
+#define TWIN_CALC_VALUE_SIZE twin_int_to_fixed(29)
+#define TWIN_CALC_VALUE_STYLE TWIN_TEXT_ROMAN
+#define TWIN_CALC_VALUE_FG 0xff000000
+#define TWIN_CALC_VALUE_BG 0x80808080
+#define TWIN_CALC_BUTTON_SIZE twin_int_to_fixed(15)
+#define TWIN_CALC_BUTTON_STYLE TWIN_TEXT_BOLD
+#define TWIN_CALC_BUTTON_FG 0xff000000
+#define TWIN_CALC_BUTTON_BG 0xc0808080
+
+static int
+_twin_calc_button_to_id (twin_calc_t *calc, twin_button_t *button)
+{
+ int i;
+
+ for (i = 0; i < TWIN_CALC_NBUTTON; i++)
+ if (calc->buttons[i] == button)
+ return i;
+ return -1;
+}
+
+static void
+_twin_calc_update_value (twin_calc_t *calc)
+{
+ char v[20];
+
+ sprintf (v, "%d", calc->stack[0]);
+ twin_label_set (calc->display, v, TWIN_CALC_VALUE_FG,
+ TWIN_CALC_VALUE_SIZE, TWIN_CALC_VALUE_STYLE);
+}
+
+static void
+_twin_calc_push (twin_calc_t *calc)
+{
+ int i;
+
+ for (i = 0; i < TWIN_CALC_STACK - 1; i++)
+ calc->stack[i+1] = calc->stack[i];
+ calc->pending_delete = TWIN_TRUE;
+}
+
+static int
+_twin_calc_pop (twin_calc_t *calc)
+{
+ int i;
+ int v = calc->stack[0];
+ for (i = 0; i < TWIN_CALC_STACK - 1; i++)
+ calc->stack[i] = calc->stack[i+1];
+ return v;
+}
+
+static void
+_twin_calc_digit (twin_calc_t *calc, int digit)
+{
+ if (calc->pending_delete)
+ {
+ calc->stack[0] = 0;
+ calc->pending_delete = TWIN_FALSE;
+ }
+ calc->stack[0] = calc->stack[0] * 10 + digit;
+ _twin_calc_update_value (calc);
+}
+
+static void
+_twin_calc_button_signal (twin_button_t *button,
+ twin_button_signal_t signal,
+ void *closure)
+{
+ twin_calc_t *calc = closure;
+ int i;
+ int a, b;
+
+ if (signal != TwinButtonSignalDown) return;
+ i = _twin_calc_button_to_id (calc, button);
+ if (i < 0) return;
+ switch (i) {
+ case TWIN_CALC_PLUS:
+ case TWIN_CALC_MINUS:
+ case TWIN_CALC_TIMES:
+ case TWIN_CALC_DIVIDE:
+ calc->pending_op = i;
+ _twin_calc_push (calc);
+ break;
+ case TWIN_CALC_EQUAL:
+ if (calc->pending_op != 0)
+ {
+ b = _twin_calc_pop (calc);
+ a = _twin_calc_pop (calc);
+ switch (calc->pending_op) {
+ case TWIN_CALC_PLUS: a = a + b; break;
+ case TWIN_CALC_MINUS: a = a - b; break;
+ case TWIN_CALC_TIMES: a = a * b; break;
+ case TWIN_CALC_DIVIDE: if (!b) a = 0; else a = a / b; break;
+ }
+ _twin_calc_push (calc);
+ calc->stack[0] = a;
+ _twin_calc_update_value (calc);
+ calc->pending_op = 0;
+ }
+ calc->pending_delete = TWIN_TRUE;
+ break;
+ case TWIN_CALC_CLEAR:
+ for (i = 0; i < TWIN_CALC_STACK; i++)
+ calc->stack[i] = 0;
+ calc->pending_op = 0;
+ calc->pending_delete = TWIN_TRUE;
+ _twin_calc_update_value (calc);
+ break;
+ default:
+ _twin_calc_digit (calc, i);
+ break;
+ }
+}
+
+void
+twin_calc_start (twin_screen_t *screen, const char *name, int x, int y, int w, int h)
+{
+ twin_calc_t *calc = malloc (sizeof (twin_calc_t));
+ int i, j;
+
+ calc->toplevel = twin_toplevel_create (screen,
+ TWIN_ARGB32,
+ TwinWindowApplication,
+ x, y, w, h, name);
+ calc->display = twin_label_create (&calc->toplevel->box,
+ "0",
+ TWIN_CALC_VALUE_FG,
+ TWIN_CALC_VALUE_SIZE,
+ TWIN_CALC_VALUE_STYLE);
+ twin_widget_set (&calc->display->widget, TWIN_CALC_VALUE_BG);
+ calc->display->align = TwinAlignRight;
+ calc->display->widget.shape = TwinShapeLozenge;
+ calc->keys = twin_box_create (&calc->toplevel->box, TwinBoxHorz);
+ for (i = 0; i < TWIN_CALC_COLS; i++)
+ {
+ calc->cols[i] = twin_box_create (calc->keys, TwinBoxVert);
+ for (j = 0; j < TWIN_CALC_ROWS; j++)
+ {
+ int b = calc_layout[j][i];
+ calc->buttons[b] = twin_button_create (calc->cols[i],
+ twin_calc_labels[b],
+ TWIN_CALC_BUTTON_FG,
+ TWIN_CALC_BUTTON_SIZE,
+ TWIN_CALC_BUTTON_STYLE);
+ twin_widget_set (&calc->buttons[b]->label.widget,
+ TWIN_CALC_BUTTON_BG);
+ calc->buttons[b]->signal = _twin_calc_button_signal;
+ calc->buttons[b]->closure = calc;
+/* calc->buttons[b]->label.widget.shape = TwinShapeLozenge; */
+ if (i || j)
+ calc->buttons[b]->label.widget.copy_geom = &calc->buttons[calc_layout[0][0]]->label.widget;
+ }
+ }
+
+ for (i = 0; i < TWIN_CALC_STACK; i++)
+ calc->stack[i] = 0;
+ calc->pending_delete = TWIN_TRUE;
+ calc->pending_op = 0;
+ twin_toplevel_show (calc->toplevel);
+}
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